JP2009299267A - Structure and method for joining precast concrete structural members together - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for joining precast concrete structural members together, which prevent restrictions on a direction of movement when the precast concrete structural members are joined together, and which enable the one structural member to be moved and joined to the other structural member. <P>SOLUTION: After a connecting portion 18 is combined with a connecting portion 26, the connecting portions 18 and 26 are connected together by means of a pin member 22 passing through the connecting portion 18 from a lateral side surface 18D. This enables the connecting portion 26 of a beam member 14 to be combined with the connecting portion 18 of a beam member 12 from upward and lateral directions. Thus, the beam member 14 can be moved upward or in the lateral direction and joined. Consequently, since the direction of the movement of the beam member 14 is not restricted to the lateral direction, the degree of freedom of construction is enhanced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a precast concrete structural member joining structure for joining together structural members made of precast concrete, and a method for joining precast concrete structural members.

  In the construction of reinforced concrete buildings, precast column members and beam members are actively used in order to save construction workers and improve construction efficiency. In particular, in the construction of high-rise buildings, rationalization of construction is important for shortening the construction period and reducing costs, and therefore construction using precast column members and beam members is effective.

  As a joining structure between these column members or between beam members, for example, as shown in FIG. 16, a joining structure 200 between precast beam members is known. In this joining structure 200, a PCa beam member 204 and a PCa beam member 206 mounted on a column member 202 made of precast concrete (hereinafter referred to as “PCa”) are joined.

  The beam member 204 and the beam member 206 are connected to beam rebars 204A and 206A protruding from respective ends by mechanical joints 208, and a formwork (not shown) is temporarily installed at the joint, and the concrete U is cast. And integrated. Thereafter, the column member 210 made of PCa is placed on the beam members 204 and 206.

  However, in this joint structure 200, post-work such as temporary placement of a formwork or placement of concrete has occurred, and it has been difficult to shorten the construction period.

  On the other hand, as shown in FIG. 17, Patent Document 1 discloses a joint structure 220 of precast beam members. In this joining structure 220, the end portion of the PCa beam member 224 placed on the PCa column member 222 and the end portion of the PCa beam member 226 are joined to each other.

  The beam member 224 and the beam member 226 are embedded in the end of the beam member 224 by moving the beam member 226 in the horizontal direction (arrow A) toward the beam member 224 integrated with the column members 222 and 230. The beam reinforcing bar 226A protruding from the end of the beam member 226 is inserted into the sleeve 228, and the sleeve 228 is filled with grout (not shown) to integrate the beam member 224 and the beam member 226.

  As described above, in the joining structure 220, although the temporary work of the formwork and the cast-in-place concrete are not required, the beam member 226 must be moved in the horizontal direction (arrow A). Therefore, when the beam member 226 cannot be moved in the horizontal direction, for example, when the beam member 226 is placed between two already installed beam members or when the movement range of the crane boom is limited, The structure 200 cannot be adopted.

Similarly, when the joining structure 200 of Patent Document 1 is applied to joining of PCa column members, the column members must be moved in the vertical direction. Therefore, when the column member cannot be moved in the vertical direction, it cannot be adopted.
Japanese Patent Application Laid-Open No. 2004-346587

  In consideration of such facts, the present invention is not limited to the moving direction when joining precast concrete structural members, and can move one structural member and join it to the other structural member. It is an object of the present invention to provide a joining structure and a joining method for precast concrete structural members.

  The precast concrete structural member joining structure according to claim 1 includes a first structural member made of precast concrete, a second structural member made of precast concrete joined to the first structural member, and an end face of the first structural member. Extending from the end surface of the second structural member in the material axis direction of the second structural member, and extending in the material axial direction of the first structural member. A second connecting part that is combined with the first connecting part from above and laterally and has the same outer shape as the first structural member as the area decreases toward the tip, and penetrates from the outer surface of the first connecting part. And connecting means for connecting the first connecting part and the second connecting part.

  According to said structure, the 1st connection part extended in the material-axis direction of this 1st structural member is provided in the end surface of the 1st structural member made from precast concrete. The first connecting portion has a cross-sectional area that decreases toward the tip. On the other hand, the 2nd connection part extended in the material-axis direction of this 2nd structural member is provided in the end surface of the 2nd structural member made from precast concrete. The second connecting portion is combined with the first connecting portion from above and in the lateral direction as the cross-sectional area decreases toward the tip portion. Further, when the second connecting portion is combined with the first connecting portion, the outer shape of the first structural member is the same. The first structural member and the second structural member are joined by a coupling means that penetrates the first coupling portion from the outer surface after combining the first coupling portion and the second coupling portion.

  In this way, after combining the first connecting portion and the second connecting portion, the second connecting portion is combined with the first connecting portion from above and laterally by passing the connecting means from the outer surface to the first connecting portion. Can. Therefore, for example, when the beam members made of precast concrete are joined together using the joint structure of the present invention, the moving direction of the second structural member is not limited to the horizontal direction. Moreover, when joining the column members made from precast concrete using the joining structure of this invention, the moving direction of a 2nd structural member is not restrict | limited to an up-down direction. Therefore, the degree of freedom in construction is improved.

  Moreover, the cross-sectional area of the first connecting portion is reduced toward the tip portion. Therefore, compared with the case where the cross-sectional area of the first connecting part is not reduced toward the tip part, the cross-sectional area in the vicinity of the root of the second connecting part (the cross-sectional area on the end surface side of the second structural member) increases. The structural cross section (cross section rigidity) that resists stress and the like increases. Therefore, the crack which arises in the base vicinity of a 2nd connection part is suppressed, and the fall of external appearance quality (aesthetics) is prevented. Further, by preventing cracks, corrosion of reinforcing bars, reinforcing bars, etc., arranged in the second structural member is prevented, and durability is improved. Similarly to the second connecting portion, cracks generated near the base of the first connecting portion are also suppressed.

  Furthermore, by increasing the cross-sectional rigidity in the vicinity of the root of the second connecting portion, the opening (cracking) of the joint surface between the first structural member and the second structural member is suppressed. In particular, the joint surface between the distal end portion of the first connecting portion and the end portion of the second structural member where stress tends to concentrate and the joint surface between the distal end portion of the second connecting portion and the end portion of the first structural member are opened. It is suppressed. Accordingly, it is possible to prevent a decrease in appearance quality (aesthetic appearance).

  The precast concrete structural member joint structure according to claim 2 is the precast concrete structural member joint structure according to claim 1, wherein the first structural member and the second structural member are beam members, and the connecting means is the The first connecting part and the second connecting part are connected through the side surface of the first connecting part.

  According to the above configuration, the first structural member and the second structural member are beam members. Moreover, the 1st connection part and the 2nd connection part are connected by the connection means which penetrates the side surface of a 1st connection part.

  A bending moment caused by a constant load acts on the first structural member and the second structural member which are beam members. However, since the cross-sectional area of the first connecting portion decreases toward the tip, the cross-sectional area near the root of the second connecting portion increases, and the structural cross section (cross-sectional rigidity) that resists bending moment (bending stress) increases. Become. Therefore, the crack etc. which arise in the base vicinity of a 2nd connection part are suppressed. Similarly to the second connecting portion, cracks and the like generated near the base of the first connecting portion are suppressed. Furthermore, by increasing the cross-sectional rigidity in the vicinity of the roots of the first connecting part and the second connecting part, the opening (cracking) of the joint surface between the first structural member and the second structural member due to the bending moment caused by the constant load is constantly generated. It is suppressed.

  The precast concrete structural member joint structure according to claim 3 is the precast concrete structural member joint structure according to claim 2, wherein the precast concrete structural member joint structure is provided at a front end portion of the first connection portion, and is formed from the upper surface side to the lower surface of the first connection portion. A first upper slope inclined toward the tip side toward the tip, a second lower slope formed by cutting out an end face of the second structural member, and the first upper slope being aligned, and a tip portion of the second connecting portion A first lower slope inclined from the lower surface side to the upper surface side of the second connecting portion provided on the front surface side, and an end surface of the first structural member are cut out, and the first lower slope surface is combined. A second upper slope.

  According to said structure, the 1st upper slope which inclines to the front end side toward the lower surface from the upper surface side of this 1st connection part is provided in the front-end | tip part of the 1st connection part. The second structural member is provided with a second lower slope that is formed by cutting out the end surface of the second structural member and is aligned with the first upper slope.

  In addition, a first lower slope that is inclined toward the tip side from the lower surface side to the upper surface side of the second connection portion is provided at the tip portion of the second connection portion. The first structural member is provided with a second upper slope that is formed by cutting out the end surface of the first structural member and is aligned with the first lower slope. The first structural member and the second structural member are joined together by combining the first upper slope and the second lower slope, and the second upper slope and the first lower slope.

  In this way, by providing the second lower slope at the end of the second structural member, the end of the second structural member extends from the base of the second connecting portion toward the back of the notch of the second structural member. The cross-sectional area increases at a constant rate, and the structural cross section (cross-sectional rigidity) that resists bending stress and the like increases. Further, the change in the cross-sectional area of the end portion of the second structural member becomes gentle, and the stress concentration generated near the root of the second connecting portion is relaxed. Therefore, cracks near the base of the second connecting portion are suppressed, and opening (cracking) of the joint surface between the tip end portion of the first connecting portion and the end portion of the second structural member is suppressed.

  Similar to the second structural member, by providing the second upper slope at the end of the first structural member, the cross-sectional area of the first structural member is constant from the root of the first connecting portion toward the back of the notch. The ratio increases and the structural cross section (cross section rigidity) that resists bending stress and the like increases. Further, the change in the cross-sectional area of the end portion of the first structural member becomes gentle, and the stress concentration generated near the root of the first connecting portion is relaxed. Therefore, cracks near the base of the first connecting portion are suppressed, and opening (cracking) of the joint surface between the tip end portion of the second connecting portion and the end portion of the first structural member is suppressed.

  Furthermore, stress transmission by bearing pressure is performed on the mating surfaces of the first upper slope and the second lower slope, and the first lower slope and the second upper slope. Therefore, the stress transmission between the first structural member and the second structural member is good.

  The precast concrete structural member joint structure according to claim 4 is the precast concrete structural member joint structure according to any one of claims 1 to 3, wherein the first joint portion is combined with the second joint portion. The first mating surface is a slope inclined toward the lateral side surface of the first connecting portion, and the second mating surface of the second connecting portion to be mated with the first connecting portion is the lateral side surface of the second connecting portion. It is a slope inclined toward.

  According to said structure, the 1st mating surface of a 1st connection part is made into the slope which inclines toward the side surface of a 1st connection part. Moreover, the 2nd mating surface of a 2nd connection part is made into the slope which inclines toward the side surface of a 2nd connection part.

  Stress concentration is likely to occur at a site where the structural cross section changes rapidly. Thus, the first connecting portion of the first connecting portion and the second connecting surface of the second connecting portion are inclined surfaces, and the first connecting portion, The stress concentration is alleviated by reducing the cross-sectional area of the second connecting portion toward the tip portion at a constant rate. Therefore, the opening (breaking) of the joint surface between the first structural member and the second structural member is suppressed. In particular, the joint surface between the distal end portion of the first connecting portion and the end portion of the second structural member where stress tends to concentrate and the joint surface between the distal end portion of the second connecting portion and the end portion of the first structural member are opened. It is suppressed. Accordingly, it is possible to prevent a decrease in appearance quality (aesthetic appearance).

  The invention according to claim 5 includes a first structural member made of precast concrete, and a second structural member made of precast concrete joined to the first structural member, from an end surface of the first structural member. The first structural member extends in the material axis direction of the second structural member from the end surface of the second structural member to the first connecting portion that extends in the material axial direction of the first structural member and the cross-sectional area decreases toward the tip. In the state of combining the second connecting portion with the first connecting portion from the upper side or the lateral direction, the first connecting portion from the outer surface in a state where the second connecting portion is combined from the upper side or the lateral direction. A connecting step of connecting the first connecting portion and the second connecting portion by connecting means penetrating therethrough.

  According to the above configuration, in the combining step, the first structural member extends from the end surface of the first structural member in the material axis direction of the first structural member, and the cross-sectional area decreases toward the tip portion. A second connecting portion that extends from the end surface in the material axis direction of the second structural member and whose cross-sectional area decreases toward the tip end portion is assembled from above or from the lateral direction. Next, in the connecting step, the first connecting portion and the second connecting portion are connected by connecting means that penetrates the first connecting portion from the outer surface in a state where the second connecting portion is combined with the first connecting portion. Therefore, the same effect as that of the first aspect of the invention can be achieved.

  Since this invention set it as said structure, when joining precast concrete structural members, without receiving restrictions of a moving direction, one structural member can be moved and it can join with the other structural member.

  Hereinafter, a precast concrete structural member joining structure and a precast concrete structural member joining method according to an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the precast concrete structural member joining structure 10 according to the first embodiment will be described.

  As shown in FIGS. 1A and 1B, the precast concrete structural member joining structure 10 includes a PCa beam member 12 (first structural member) and a PCa beam member 14 (second structural member). And join.

  A connecting part 18 (first connecting part) and a notch part 16 are provided at the end of the beam member 12. The connecting portion 18 protrudes from the end surface 12A of the beam member 12 and extends in the material axis direction (length direction) of the beam member 12. Vertical surfaces 18A and 18C whose surfaces are substantially vertical and an upper slope 18B (first upper slope) are formed at the tip of the connecting portion 18. As shown in FIG. 2B, the upper inclined surface 18B is inclined toward the tip end side (vertical surface 18A side) from the upper surface 18H of the connecting portion 18 toward the lower surface 18I. That is, the upper slope 18B is a slope whose upper side is open.

  As shown in FIG. 2 (B), the notch portion 16 is provided by notching the end surface 12A of the beam member 12, and a rear wall surface 16A having a substantially vertical surface and a connecting portion 26 of the beam member 14 described later. And an upper slope 16B (second upper slope) to which the lower slope 26B is combined. The upper slope 16B is inclined from the upper surface 12B side to the lower surface 12C of the beam member 12 toward the end surface 12A. That is, the upper slope 16B is a slope whose upper side is open. Due to the upper slope 16B, the cross-sectional area of the end portion of the beam member 12 (the cross section perpendicular to the material axis direction of the beam member 12) is constant from the end surface 12A (the base of the connecting portion 18) toward the back wall surface 16A. It is getting bigger.

  2A, the mating surface 18E (first mating surface) of the coupling portion 18 to which the coupling portion 26 (second coupling portion) of the beam member 14 is mated is the back wall surface of the notch portion 16. The slope is inclined from 16 </ b> A toward the lateral side surface 18 </ b> D of the connecting portion 18. Due to the upper slope 18B and the mating surface 18E, as shown in FIGS. 3A to 3E, the cross-sectional area of the connecting portion 18 decreases toward the tip.

  As shown in FIG. 1A, a plurality of steel sheath tubes 20 are embedded in the connecting portion 18 substantially horizontally so as not to protrude from the mating surface 18E, and a connecting hole 21 is formed by the sheath tube 20. ing. Reinforcing bar-like pin member 22 (connecting means) can be inserted into connecting hole 21 from the side surface 18D side of connecting portion 18. Further, inside the sheath tube 20, a ring-shaped spacer 22 </ b> A that supports a pin member 22 that penetrates the sheath tube 20 is welded. By this spacer 22A, the pin member 22 is arranged at the approximate center of the sheath tube 20.

  Although not shown in FIGS. 1 to 3, the beam member 12 is provided with an upper reinforcement 30, a lower reinforcement 32, and a shear reinforcement 34 as shown in FIGS. 4 (A) and 4 (B). It is streaked. Further, two oblique bars 36 are further arranged in the connecting portion 18 along the mating surface 18E.

  An end portion of the beam member 14 is provided with a connection portion 26 in which the connection portion 18 of the beam member 12 is combined, and a notch portion 24 in which the distal end portion of the connection portion 18 is combined. The connecting portion 26 projects from the end surface 14A of the beam member 14 and extends in the material axis direction (length direction) of the beam member 14. Vertical surfaces 26A and 26C having a substantially vertical surface and a lower slope 26B (first lower slope) are formed at the tip of the connecting portion 26. As shown in FIG. 2B, the lower slope 26B is inclined from the lower surface 26I of the connecting portion 26 toward the upper surface 26H toward the tip side (vertical surface 26A side). That is, the upper slope 26B is a slope whose lower side is open. The vertical surface 26A and the lower slope 26B are formed so as to face the inner wall 16A and the upper slope 16B of the notch 16 when combined with the notch 16 of the beam member 12. Further, when the connecting portion 26 is combined with the notch portion 16 and the connecting portion 18 of the beam member 12, the outer shape of the beam member 12 is the same.

  The notch portion 24 is provided by notching the end surface 14A of the beam member 14, and a bottom wall surface 24A having a substantially vertical surface and a lower slope surface 24B (second lower slope surface) where the upper slope surface 18B of the connecting portion 18 is combined. It has. As shown in FIG. 2B, the lower inclined surface 24B is inclined from the lower surface 14C side of the beam member 14 toward the upper surface 14B toward the end surface 14A. In other words, the lower slope 24B is a slope whose lower part is open. Due to the lower slope 24B, the cross-sectional area of the beam member 14 (the cross section perpendicular to the material axis direction of the beam member 14) increases at a constant rate from the end surface 14A toward the back wall surface 24A. The rear wall surface 24A and the lower slope surface 24B are formed to face the vertical surface 18A and the upper slope surface 18B of the connection portion 18 when combined with the connection portion 18 of the beam member 12.

  As shown in FIG. 2A, the mating surface 26 </ b> E (second mating surface) of the coupling portion 26 that is mated with the coupling portion 18 of the beam member 12 extends from the back wall surface 24 </ b> A of the notch portion 24 to the lateral side surface of the coupling portion 26. The slope is inclined toward 26D. Due to the lower slope 26B and the mating surface 26E, as shown in FIGS. 3A to 3E, the cross-sectional area of the connecting portion 26 decreases toward the tip. Note that, similarly to the beam member 12, the beam member 14 is provided with upper bars, lower bars, shear reinforcement bars, and oblique bars.

  As shown in FIG. 1A, a plurality of steel sheath tubes 28 are embedded in the connecting portion 26 so as not to protrude from the mating surface 26E, and a connecting hole 29 is formed by the sheath tube 28. ing. Inside the sheath tube 28, a ring-shaped spacer 28A that supports the pin member 22 penetrating the sheath tube 28 is welded. By this spacer 28A, the pin member 22 is arranged at the approximate center of the sheath tube 28. Further, the connecting hole 29 formed by the sheath tube 28 is inserted into the connecting hole 21 formed in the connecting portion 18 when the connecting portion 26 is combined with the connecting portion 18 of the beam member 12, and the pin member 22 is inserted. The

  Next, an example of a joining method of the precast concrete structural member joining structure 10 according to the first embodiment will be described. Although the first embodiment will be described as an example, the present bonding method can be applied to all the embodiments.

  As shown in FIGS. 1 (A) and 1 (B), the connecting portion 26 of the beam member 14 is connected to the mating surface 18E of the connecting portion 18 of the beam member 12 placed on a column member (not shown). The mating surface 26E is assembled from above or from the side (combination process). As a result, the lower slope 26B is matched with the upper slope 16B, and the upper slope 18B is matched with the lower slope 24B. Further, the installation height of the beam member 14 is adjusted so that the center of the connecting hole 21 formed in the connecting portion 18 and the center of the connecting hole 29 formed in the connecting portion 26 substantially coincide with each other. In FIG. 1A, the connecting portions 26 of the beam members 14 are combined from the lateral direction.

  Next, an air hose (not shown) made of an elastic material such as rubber is inserted into the gap between the connecting portion 18 and the connecting portion 26, the gap between the connecting portion 18 and the notch portion 24, and the gap between the connecting portion 26 and the notch portion 16. It arrange | positions along the opening periphery of the formed joint, air is blown into an air hose, it expands, and the joint of the connection part 18 and the connection part 26 is sealed. At this time, an injection port (not shown) for filling a hardening material 38 such as grout or mortar is secured around the periphery of the opening of the joint.

  Next, as shown to FIG. 1 (A), the pin member 22 is penetrated to the connection holes 21 and 29 from the side surface 18D side of the connection part 18 (connection process), and it shows to FIG. 3 (A)-(E). As described above, each of the sheath tubes 20 and 28 is filled with a curing material 38. The curing material 38 is filled into the sheath tubes 20 and 28 from the gap between the spacer 20A or the spacer 28A and the pin member 22. Further, the hardening material 38 is filled into the gap between the connecting portion 18 and the connecting portion 26 from the inlet provided in the opening periphery of the joint. After the curing material 38 is cured, air is removed from the air hose and contracted, and the air hose is removed from the opening periphery of the joint.

  Thus, by filling the sheath tubes 20 and 28 with the curing material 38, the pin member 22 is fixed in the sheath tubes 20 and 28, and shearing forces acting on the connecting portions 18 and 26 are transmitted to each other. In addition, by filling the gap between the connecting portion 18 and the connecting portion 26 with the hardening material 38, the connecting portions 18 and 26 are brought into close contact with each other without any gap, and the stress transmission in the connecting portions 18 and 26 is improved.

  In the present invention, the hardening material 38 is filled in the gap between the connecting portion 18 and the connecting portion 26, the gap between the connecting portion 18 and the notch portion 24, and the gap between the connecting portion 26 and the notch portion 16. The connecting portion 18 and the connecting portion 26, the connecting portion 18 and the notch portion 24, and the connecting portion 26 and the notch portion 16 may be brought into contact with each other without being filled. Thus, for example, when the upper slope 18B is fitted to the lower slope 24B, not only the lower slope 24B and the upper slope 18B are brought into direct contact with each other, but also the curing material 38 or the like is interposed therebetween as described above. Indirect alignment is also included. The same applies to the case where the lower slope 26B is combined with the upper slope 16B.

  Next, the operation and effect of the precast concrete structural member joining structure 10 according to the first embodiment will be described.

  After the connecting portion 18 and the connecting portion 26 are combined, the connecting portion 18 and the connecting portion 26 are connected to the connecting portion 18 of the beam member 12 by connecting the connecting portion 18 and the connecting portion 26 with the pin member 22 penetrating the connecting portion 18 from the side surface 18D. Thus, the connecting portion 26 of the beam member 14 can be combined from above and from the lateral direction. Therefore, the beam member 14 can be joined by moving upward or laterally. Therefore, the moving direction of the beam member 14 is not limited to the horizontal direction, and the degree of freedom in construction is improved.

  Further, since the connecting portion 18 of the beam member 12 serves as a guide when the connecting portion 26 of the beam member 14 is combined, the combination accuracy is improved. Further, since the beam member 12 and the beam member 14 are joined to the connection holes 21 and 29 formed in the connection portions 18 and 26 by passing through the pin member 22, there is no need for temporary work of the cast-in-place concrete or the formwork. It is possible to improve the workability and shorten the construction period.

  Here, FIGS. 5A and 5B show a comparative example in which the beam members 12 and the beam member 14 are joined by combining the connecting portions 40 and 42 whose cross-sectional area does not change. In addition, the beam member 12 and the beam member 14 are joined by the pin member 22 which penetrates the connection parts 40 and 42 similarly to this embodiment.

  In this comparative example, the base cross-sectional area of the connecting portion 40 is almost half that of the beam member 12. Furthermore, the cross-sectional area changes rapidly at the base of the connecting portion 40, and bending stress tends to concentrate near the base of the connecting portion 40. Therefore, when a bending moment (bending stress) due to a constant load or the like is applied for a long period of time, as shown in FIG. 5 (B), a crack 44 is generated near the root of the connecting portion 40 or the tip of the connecting portion 40 is The joint between the vertical surface 40A and the end surface 14A of the beam member 14 may open (arrow A).

  On the other hand, in the present embodiment, the cross-sectional area of the connecting portion 18 provided at the end of the beam member 12 is gradually reduced toward the tip. Therefore, as shown in FIGS. 3A to 3E, the cross-sectional area of the connecting portion 26 of the beam member 14 gradually increases toward the root of the connecting portion 26. Further, the cross-sectional area of the end portion of the beam member 14 gradually increases from the end surface 14 </ b> A toward the back wall surface 24 </ b> A of the notch portion 24. Therefore, the structural cross section (cross section rigidity) of the end portion of the beam member 14 that resists the bending moment caused by the constant load is larger than that of the comparative example shown in FIG.

6A is a schematic diagram of a cross section of the comparative example shown in FIG. 5, and FIG. 6B is a schematic diagram of the cross section of the present embodiment (simulating FIG. 3E). When the cross-sectional rigidity of the comparative example and this embodiment is calculated based on FIG. 6, the cross-sectional rigidity EI ₁ near the base of the connecting portion 42 of the comparative example shown in FIG. 6A is EI ₁ = 4EI ₀ (E : Young's ^{_{modulus, I 0 = bh 3/96}} ) in which while the cross section stiffness EI ₂ around the root of the connecting portion 26 of this embodiment shown in FIG. 6 _(B), EI 2 = 6.24EI ₀ (EI ₁ <EI ₂ ). Thus the cross-sectional rigidity EI ₂ around the root of the connecting portion 26 of this embodiment, larger than the cross-sectional stiffness EI ₁ near the base of the connecting portion 42 of the comparative example.

  Therefore, the crack produced in the base vicinity of the connection part 26 is suppressed, and the fall of external appearance quality (aesthetics) is suppressed. Further, by suppressing cracks, corrosion of the upper end bars, lower end bars, shear reinforcement bars and the like arranged in the connecting portion 26 is prevented, and durability is improved. Further, by increasing the cross-sectional area of the base of the connecting portion 18, as shown in FIG. 4A, a space for arranging the oblique bars 36 in the connecting portion 18 is secured, and the bending rigidity of the connecting portion 18 is increased. be able to.

  Further, in the present embodiment, as shown in FIG. 2 (A), the connecting surfaces 18E and 26E of the connecting portion 18 and the connecting portion 26 are inclined so that the cross-sectional area of the connecting portions 18 and 26 is directed toward the tip portion. Gradually decreasing. Further, as shown in FIG. 1A, the upper slope 18B and the lower slope 26B are provided at the distal ends of the connecting portions 18 and 26, respectively, so that the sectional area of the distal ends is gradually reduced. Therefore, not only the cross-sectional rigidity at the base of the connecting portions 18 and 26 is increased, but also the change in the cross-sectional area (structural cross section) of the connecting portions 18 and 26 is moderated, and the stress concentration is alleviated. Therefore, the opening (breaking) of the joint surface between the connecting portion 18 and the connecting portion 26 is suppressed. In particular, the opening of the joint surface (see FIG. 1A) between the vertical surface 18A of the connecting portion 18 where stress tends to concentrate and the back wall surface 24A of the notch portion 24 is suppressed. Accordingly, it is possible to prevent a decrease in appearance quality (aesthetic appearance).

  Similar to the beam member 14, the cross-sectional area of the connecting portion 18 of the beam member 12 gradually increases toward the root of the connecting portion 18. Further, the cross-sectional area of the end portion of the beam member 12 gradually increases from the end surface 12A toward the back wall surface 16A of the notch portion 16. Therefore, the crack which arises in the base vicinity of the connection part 18 is suppressed, and the fall of external appearance quality (aesthetics) is prevented. Furthermore, the opening of the joint surface (see FIG. 1A) between the end surface 12A of the beam member 12 and the vertical surface 26C of the connecting portion 26 is suppressed.

  Next, the structure of the modification 1 of 1st Embodiment is demonstrated. Only parts different from the first embodiment will be described.

  In the first modification, as shown in FIGS. 7 (A) and 7 (B), instead of the pin member 22 as the connecting means, a stat bolt 46 having male screws cut at both ends of the shaft is used. And the connecting portion 26 are connected.

  A plurality of steel sheath tubes 48 are embedded substantially horizontally in the connecting portion 18 of the beam member 12 so as not to protrude from the mating surface 18E of the connecting portion 18, and a connecting hole 49 is formed by the sheath tube 48. . A stat bolt 46 can be inserted into the connecting hole 49 from the lateral side surface 18D of the connecting portion 18. Inside the sheath tube 48, a ring-shaped spacer 48A that supports a stat bolt 46 (connection means) penetrating the sheath tube 48 is welded. With this spacer 46 </ b> A, the stat bolt 46 is disposed substantially at the center of the sheath tube 20.

  Similar to the connecting portion 18, a plurality of steel sheath tubes 50 are embedded in the connecting portion 26 of the beam member 14 substantially horizontally so as not to protrude from the mating surface 26 </ b> E of the connecting portion 26. 51 is formed. Inside the sheath tube 50, a ring-shaped spacer 50A that supports a stat bolt 46 penetrating the sheath tube 50 is welded. With this spacer 50 </ b> A, the stat bolt 46 is disposed substantially at the center of the sheath tube 50. Further, the connecting hole 51 formed by the sheath tube 50 passes through the connecting hole 49 and the stat bolt 46 is penetrated when the connecting part 26 is combined with the connecting part 18.

  Next, the joining method of the modification 1 of 1st Embodiment is demonstrated.

  First, as in the first embodiment, the connecting portion 26 of the beam member 14 is combined with the connecting portion 18 of the beam member 12 from above or from the side (combining step). Next, in a state where the connecting portion 18 and the connecting portion 26 are combined, the stat bolt 46 is passed through the connecting holes 49 and 51 from the side surface 18D side of the connecting portion 18 (connecting step), Fill with a hardener (not shown). The curing material is filled into the sheath tubes 48 and 50 through the gap between the spacer 48A or the spacer 50A and the stat bolt 46. Then, nuts 54 are screwed from both ends of the shaft of the stat bolt 46 through the washers 52 and tightened from both sides of the shaft to fix the stat bolt 46 to the spacers 48A and 50A.

  Next, operations and effects of the first modification of the first embodiment will be described.

The stat bolt 46 can be fixed to the centers of the sheath tubes 48 and 50 by fastening the stat bolt 46 with the nuts 54 from both sides. Further, the joining strength of the connecting portions 18 and 26 can be increased by the tightening force of the stat bolt 46 and the nut 54.
In addition, the connecting holes 49 and 51 may be filled with a hardener or the like so that the nut 54 is not exposed.

  Next, the configuration of Modification 2 of the first embodiment will be described. Only parts different from the first embodiment will be described.

  In the second modification, as shown in FIGS. 8 and 9, the connecting portion 18 and the connecting portion 26 are connected with a bolt 56 having a hexagonal hole instead of the pin member 22 as the connecting means. In FIG. 8, since the drawing is complicated, the illustration of the beam reinforcing bars 66 and 72 arranged in the connecting portions 18 and 26 is omitted.

  As shown in FIG. 9, a steel pipe 58 through which the threaded portion of the bolt 56 passes is embedded on the side of the mating surface 18E of the connecting portion 18 of the beam member 12 so as not to protrude from the mating surface 18E. A steel pipe 62 in which the head of the bolt 56 and the washer 60 are accommodated is embedded substantially horizontally on the side surface 18D side of the connecting portion 18. A connecting hole 63 is formed by these steel pipes 58 and 62, and a bolt 56 penetrating the connecting part 18 is inserted into the connecting hole 63 from the side surface 18 </ b> D side of the connecting part 18. A fixing metal fitting 64 is disposed between the steel pipe 58 and the steel pipe 62, and the steel pipes 58 and 62 are welded and integrated with the fixing metal fitting 64, respectively. Both ends of the fixing metal 64 are bent into a substantially arc shape, and the connecting hole 63 is arranged at a predetermined position by hooking the arc portion to the beam reinforcing bar 66 arranged in the connecting portion 18. A reinforcing bar 68 is arranged around the steel pipe 62.

  A long nut 70 into which the threaded portion of the bolt 56 is screwed is embedded substantially horizontally on the side of the mating surface 26E of the connecting portion 26 of the beam member 14 so as not to protrude from the mating surface 26E. A connecting hole 71 is formed by the long nut 70, and a bolt 56 can be inserted into the connecting hole 71 from the mating surface 26 </ b> E side of the connecting portion 26. Note that the bolt 56 does not penetrate the connecting portion 26.

A fixing fitting 72 is welded to the end of the long nut 70. Similar to the fixing metal 64, both ends of the fixing metal 72 are bent into a substantially arc shape, and this arc portion is hooked to a beam reinforcing bar 74 arranged in the connecting portion 26, whereby the connection hole 71 is formed at a predetermined position. Be placed. When the connecting portion 26 is combined with the connecting portion 18, the connecting hole 71 is inserted into the connecting hole 71 formed in the connecting portion 18 and the bolt 56 is inserted therein. A reinforcing bar 76 is arranged around the long nut 70.
The fixtures 64 and 72 are fixtures for disposing the steel pipes 58 and 62 and the long nut 70 at predetermined positions, and may be provided as needed. Moreover, what is necessary is just to be able to support and fix the steel pipes 58 and 62 or the long nut 70, and it can replace with the fixing metal fittings 64 and 72, and can employ | adopt various fixing tools.

  Next, the joining method of the modification 2 of 1st Embodiment is demonstrated.

  First, as in the first embodiment, the connecting portion 26 of the beam member 14 is combined with the connecting portion 18 of the beam member 12 from above or from the side (combining step). Next, in a state where the connecting portion 18 and the connecting portion 26 are combined, the bolt 56 is inserted into the connecting holes 63 and 71 through the washer 60 from the side surface 18D side of the connecting portion 18, and the bolt 56 is inserted into the long nut 70. Screw in and tighten (connecting process). Thereafter, the gap between the connecting portion 18 and the connecting portion 26 and the steel pipe 62 are filled with the hardener 38, and the beam member 12 and the beam member 14 are integrated.

  Next, operations and effects of the second modification of the first embodiment will be described.

  By inserting the bolt 56 into the connecting holes 63 and 71 formed in the connecting portions 18 and 26 and screwing the bolt 56 into the long nut 70 and tightening, the joining strength between the connecting portion 18 and the connecting portion 26 can be increased. . Further, by embedding the long nut 70 in the connecting portion 26, the connecting portion 18 and the connecting portion 26 can be connected only by tightening the bolt 56 from the side surface 18 </ b> D side of the connecting portion 18. Therefore, since there is no need to temporarily install a scaffold or the like on the side surface 26D side of the connecting portion 26, workability is improved. In particular, this modification is suitable when the lateral side surface 26D of the connecting portion 26 is disposed outside the building.

  Next, the configuration of the precast concrete structural member joining structure 80 according to the second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  In the second embodiment, as shown in FIG. 10, stepped portions are provided at the front end portions of the cutout portion 16 and the connecting portion 18 instead of the first embodiment. Vertical ends 18A and 18C having a substantially vertical surface and a horizontal surface 18F having a substantially horizontal surface are formed at the distal end portion of the connecting portion 18 of the beam member 12, and a step (step portion) is provided in a step shape. ing. Further, the notch 16 of the beam member 12 is formed with a rear wall surface 16A having a substantially vertical surface and a horizontal surface 16C having a substantially horizontal surface, and is provided with a step (step) in a stepped shape. .

  At the tip of the connecting portion 26 of the beam member 14, vertical surfaces 26 </ b> A and 26 </ b> C whose surfaces are substantially vertical and a horizontal surface 26 </ b> F whose surfaces are substantially horizontal are formed, and a step (step portion) is provided in a step shape. ing. The vertical surface 26A and the horizontal surface 26F are formed so as to face the rear wall surface 16A and the horizontal surface 16C of the notch 16 when combined with the notch 16. Further, the notch portion 24 of the beam member 14 is formed with a back wall surface 24A having a substantially vertical surface and a horizontal surface 24C having a substantially horizontal surface, and is provided with a step (step) in a stepped shape. These back wall surface 24A and horizontal surface 24C are formed so as to face the vertical surface 18A and horizontal surface 18F of the connecting portion 18 when combined with the connecting portion 18.

  In addition, since it joins with the method similar to the joining method of 1st Embodiment about a joining method, description is abbreviate | omitted.

  Next, the operation and effect of the precast concrete structural member joining structure 80 according to the second embodiment will be described.

  As shown in FIG. 10 (A), after combining the connecting portion 18 and the connecting portion 26, the connecting portion 18 and the connecting portion 26 are connected by the pin member 22 that penetrates the connecting portion 18 from the side surface 18D. The connecting portion 26 of the beam member 14 can be combined with the connecting portion 18 of the beam member 12 from above and from the lateral direction. Therefore, the beam member 14 can be joined by moving upward or laterally. Therefore, the moving direction of the beam member 14 is not limited to the horizontal direction, and the degree of freedom in construction is improved.

  Similarly to the first embodiment, the mating surface 18E of the connecting portion 18 is an inclined surface that is inclined from the back wall surface 16A of the notch portion 16 toward the lateral side surface 18D of the connecting portion 18, and the mating portion 26 is aligned. The surface 26 </ b> E is an inclined surface that is inclined from the inner wall surface 24 </ b> A of the notch portion 24 toward the lateral side surface 26 </ b> D of the connecting portion 26. That is, the cross-sectional areas of the connecting portions 18 and 26 are reduced toward the respective tip portions, and the cross-sectional areas of the connecting portions 18 and 26 are gradually increased toward the respective bases. Furthermore, by providing the notches 16 and 24 at the ends of the beam members 12 and 14, the cross-sectional area of the ends of the beam members 12 and 14 is changed from the end surfaces 12A and 14A to the back wall surfaces of the notches 16 and 24. The structural cross section (cross-sectional rigidity) of the end portions of the beam members 12 and 14 that increase toward 16A and 24A and resist the bending moment caused by the constant load increases. Therefore, cracks generated near the roots of the connecting portions 18 and 26 are suppressed, and deterioration in appearance quality (aesthetic appearance) is prevented.

  Further, compared to the case where the notches 16 and 24 are not provided, the change in the cross-sectional area in the vicinity of the roots of the connecting portions 18 and 26 becomes moderate, and the stress concentration is alleviated. Therefore, the opening of the joint surface between the vertical surface 18A of the connecting portion 18 and the back wall surface 24A of the notch 24 is suppressed, and the joint surface between the end surface 12A of the beam member 12 and the vertical surface 26C of the connecting portion 26 is opened. Is suppressed.

  Furthermore, in this embodiment, since the horizontal surfaces 18F and 26F are provided instead of the slopes at the tip portions of the connecting portions 18 and 26, the productivity of the beam members 12 and 14 is improved. Similarly, since the notches 16 and 24 are provided with the horizontal surfaces 16C and 24C rather than the inclined surfaces, the productivity of the beam members 12 and 14 is improved.

  In the present embodiment, the horizontal surfaces 18F and 26F are formed at the distal ends of the connecting portions 18 and 26 to provide one step portion, but a plurality of step portions may be provided. For example, as shown in FIG. 11, two horizontal surfaces 18F and 18G are formed at the distal end portion of the connecting portion 18 and two horizontal surfaces 26F and 26G are formed at the distal end portion of the connecting portion 26 to provide two step portions. Good. At this time, two horizontal planes 24C and 24D in which the horizontal planes 18F and 18G are combined may be formed in the cutout portion 24, and horizontal planes 16C and 16D in which the horizontal planes 26F and 26G are combined may be formed in the cutout portion 16. .

  Next, the structure of the modification 1 of 2nd Embodiment is demonstrated.

  In this modified example, as shown in FIG. 12A, the beam members 12 and 14 are joined with the connecting portion 18 and the connecting portion 26 combined without providing a notch portion.

  The mating surface 18E of the connecting portion 18 is an inclined surface that is inclined from the end surface 12A of the beam member 12 toward the lateral side surface 18D of the connecting portion 18. Further, the mating surface 26E of the connecting portion 26 is a slope inclined from the end surface 14A of the beam member 14 toward the lateral side surface 26D of the connecting portion 26. Then, the vertical surface 26A of the connecting portion 26 is aligned with the end surface 12A of the beam member 12, the end surface 14A of the beam member 14 is aligned with the vertical surface 18A of the connecting portion 18, and the connecting portion 18 and the connecting portion 26 are connected by the pin member 22. Are connected.

  Next, operations and effects of the first modification of the second embodiment will be described.

  The mating surface 18E of the connecting portion 18 is an inclined surface that is inclined from the end surface 12A of the beam member 12 toward the lateral side surface 18D of the connecting portion 18. Further, the mating surface 26E of the connecting portion 26 is a slope inclined from the end surface 14A of the beam member 14 toward the lateral side surface 26D of the connecting portion 26. That is, the cross-sectional areas of the connecting portions 18 and 26 decrease at a constant rate toward the tip portions, and the cross-sectional areas of the connecting portions 18 and 26 increase at a constant rate toward the roots. . Therefore, the structural cross section (cross-sectional rigidity) of the ends of the beam members 12 and 14 that resist the bending moment caused by the constant load is increased, and cracks that occur near the roots of the connecting portions 18 and 26 are suppressed.

  Furthermore, compared with the case where the mating surfaces 18E and 26E are not inclined, the change in the cross-sectional area near the roots of the connecting portions 18 and 26 becomes gentle, and the stress concentration is alleviated. Therefore, the opening of the joint surface between the vertical surface 18A of the connecting portion 18 and the end surface 14A of the beam member 14 is suppressed, and the opening of the joint surface between the end surface 12A of the beam member 12 and the vertical surface 26A of the connecting portion 26 is suppressed. Is done.

  In this way, even if the notches are not provided at the ends of the beam members 12, 14, the cracks generated near the bases of the connection parts 18, 26 are increased by increasing the cross-sectional area near the bases of the connection parts 18, 26. Etc. can be suppressed.

  The mating surfaces 18E and 26E of the connecting portions 18 and 26 do not need to be sloped over the entire surface, and slopes may be formed on part of the mating surfaces 18E and 26E. For example, in the configuration shown in FIG. 12B, two vertical surfaces 82, 84 formed substantially vertically on the mating surface 18 </ b> E of the connecting portion 18, and the beam member 12 formed between the vertical surfaces 82, 84. An inclined surface 86 that is inclined from the end surface 12A toward the lateral side surface 18D of the connecting portion 18 is provided. Further, two vertical surfaces 88, 90 formed substantially vertically on the mating surface 26E of the connecting portion 26 and a lateral side surface of the connecting portion 26 formed between the vertical surfaces 88, 90 from the end surface 14A of the beam member 14 are shown. And a slope 92 that slopes toward 26D.

  Thus, by providing the slopes 86 and 90 on a part of the mating surfaces 18E and 26E, the cross-sectional area near the roots can be made larger than the tips of the connecting portions 18 and 26. That is, since the base cross-sectional areas (cross-sectional rigidity) of the connecting portions 18 and 26 that resist the bending moment caused by the constant load are increased, the same effects as described above can be obtained.

  Next, the configuration of Modification 2 of the second embodiment will be described.

  In this modification, as shown in FIG. 13 (A), the slopes are not provided on the mating surfaces 18E and 26E of the connecting portions 18 and 26, and the upper slope 18B and the lower slope are provided only at the tip portions of the connecting portions 18 and 26, respectively. 26B is provided.

  Vertical surfaces 18A and 18C having a substantially vertical surface and an upper slope 18B are formed at the distal end of the connecting portion 18 of the beam member 12. Further, the notch portion 16 of the beam member 12 is provided with an inner wall surface 16A having a substantially vertical surface and an upper slope 16B to which the lower slope 26B of the connecting portion 26 is combined.

  The connecting portion 26 of the beam member 14 is formed with vertical surfaces 26A and 26C having a substantially vertical surface and a lower slope 26B. The vertical surface 26A and the lower slope 26B are formed so as to face the inner wall 16A and the upper slope 16B of the notch 16 when the connecting portion 26 and the notch 16 of the beam member 12 are combined. Yes.

  Further, the notch 24 of the beam member 14 is formed with a rear wall surface 24A having a substantially vertical surface and a lower slope 24B to which the upper slope 18B of the connecting portion 18 is combined. The rear wall surface 24A and the lower slope surface 24B are formed to face the vertical surface 18A and the upper slope surface 18B of the connection portion 18 when combined with the connection portion 18 of the beam member 12.

  On the other hand, the mating surfaces 18E and 26E of the connecting portions 18 and 26 are surfaces substantially parallel to the lateral side surfaces 18D and 26D of the connecting portions 18 and 26, and are not inclined.

  Next, operations and effects of the second modification of the second embodiment will be described.

  Due to the lower slope 24B provided in the notch 24 of the beam member 14, the cross-sectional area of the end of the beam member 14 is constant from the end surface 14A of the beam member 14 toward the back wall 24A of the notch 24. It is getting bigger. Therefore, as compared with the case where the notch portion 24 is not provided, the structural cross section (cross-sectional rigidity) of the end portion of the beam member 14 that resists the bending moment caused by the constant load is increased. Furthermore, by providing the notch 24 at the end of the beam member 14, the change in the cross-sectional area near the base of the connecting portion 26 is moderated, and the stress concentration is alleviated. Therefore, cracks generated near the root of the connecting portion 26 are suppressed, and the opening of the joint surface between the vertical surface 18A of the connecting portion 18 and the end surface 14A of the beam member 14 is suppressed.

  Similarly to the beam member 14, the notch 16 is provided at the end of the beam member 12, so that cracks generated near the base of the connecting portion 18 are suppressed, and the end surface 12 A of the beam member 12 and the connecting portion 26 are The opening of the joint surface with the vertical surface 26A is suppressed.

  As described above, the bending moment caused by the constant load can be obtained by providing the notches 16 and 24 at the ends of the beam members 12 and 14 without providing slopes on the mating surfaces 18E and 26E of the connecting portions 18 and 26. It is possible to increase the structural cross section (cross section rigidity) of the end portions of the beam members 12 and 14 that resist resistance. That is, it is not always necessary to provide slopes on the mating surfaces 18E and 26E, and it may be provided as appropriate.

  As shown in FIG. 13B, only the upper slope 18B may be formed at the distal end portion of the connecting portion 18. In this case, the lower slope 24B to which the upper slope 18B is aligned may be formed in the notch 24 of the beam member 14. Similarly, only the lower slope 26B may be formed at the tip of the connecting portion 26, and in this case, the upper slope 16B with which the lower slope 26B is aligned may be formed in the notch 16 of the beam member 12. .

  Next, the configuration of the precast concrete structural member joining structure 100 according to the third embodiment will be described. Components having the same configurations as those in the first and second embodiments are denoted by the same reference numerals and will be appropriately omitted.

  As shown in FIGS. 14A and 14B, a connecting portion 106 and two notches 102 and 104 are provided at the end of the beam member 12. The connecting portion 106 (first connecting portion) located between the notches 102 and 104 is projected from the end surface 12A of the beam member 12 and extends in the material axis direction (length direction) of the beam member 12. At the distal end of the connecting portion 18 are vertical surfaces 106A and 106C whose surfaces are substantially vertical, and an upper slope 106B that is inclined from the upper surface 106F side to the lower surface 106G of the connecting portion 106 toward the distal end side (vertical surface 106A side). (First upper slope). In FIG. 14B, the imaginary line of the connecting portion 106 is omitted because the drawing becomes complicated.

  Further, the mating surfaces 106D and 106E of the connecting portion 106 are inclined surfaces inclined from the rear wall surfaces 102A and 104A of the notches 102 and 104 toward the center in the width direction of the beam member 12. Due to the upper slope 106B and the mating surfaces 106D and 106E, the cross-sectional area of the connecting portion 106 decreases toward the tip.

  The notches 102 and 104 are provided by notching the end surface 12A of the beam member 12, and the rear wall surfaces 102A and 104A having a substantially vertical surface and the lower slopes 110B and 112B of the connecting portions 110 and 112 of the beam member 14 are provided. Upper slopes 102B and 104B (second upper slopes) to be combined. Due to the upper slopes 102B and 104B, the cross-sectional area of the end portion of the beam member 12 increases at a constant rate from the end surface 12A toward the back wall surfaces 102A and 104A.

  At the end of the beam member 14, a notch portion 108 and two connecting portions 110 and 112 (second connecting portions) are provided. The two connecting portions 110 and 112 arranged on both sides of the notch portion 108 project from the end surface 14A of the beam member 14 and extend in the material axis direction (length direction) of the beam member 14. The front end of the connecting portion 110 includes vertical surfaces 110A and 110C whose surfaces are substantially vertical, and a lower slope 110B (inclined to the front end side (the vertical surface 110A side) from the lower surface 110G side to the upper surface 110F of the connecting portion. A first lower slope). Further, the front end portion of the connecting portion 112 has vertical surfaces 112A and 112C whose surfaces are substantially vertical, and a lower slope inclined to the front end side (vertical surface 112A side) from the lower surface 112G side of the connecting portion toward the upper surface 112F. 110B (first lower slope) is formed.

  Due to the lower slopes 110B and 112B, the cross-sectional areas of the connecting portions 110 and 112 become smaller toward the tip at a constant rate. When these vertical surfaces 110A and 112A and lower slopes 110B and 112B are combined with the notches 102 and 104, they face the rear wall surfaces 102A and 104A and the upper slopes 102B and 104B of the notches 102 and 104, respectively. Is formed. Further, when the connecting portions 110 and 112 are combined with the notches 102 and 104, the outer shape of the beam member 12 is the same.

  The mating surfaces 110E and 112E of the connecting portions 110 and 112 are inclined surfaces that are inclined from the back wall surface 108A of the notch portion 108 toward the side surfaces 110D and 112D of the connecting portions 110 and 112, respectively. By these lower slopes 110B and 112B and the mating surfaces 110E and 112E, the cross-sectional areas of the connecting portions 110 and 112 become smaller toward the tip.

  The notch 108 is provided by notching the end face 14A of the beam member 14, and a lower slope 108B (second lower slope) in which the rear wall surface 108A having a substantially vertical surface and the upper slope 106B of the connecting portion 106 are combined. Is formed. Due to the lower slope 108B, the cross-sectional area of the beam member 14 increases at a constant rate from the end face 14A toward the back wall face 108A. The back wall surface 108A and the lower slope 108B are formed to face the vertical surface 106A and the upper slope 106B of the connection portion 106 when combined with the connection portion 106 of the beam member 12.

  A plurality of sheath tubes 20 are embedded substantially horizontally so as not to protrude from the mating surfaces 106 </ b> D and 106 </ b> E, and a connection hole 21 is formed by the sheath tube 20. A plurality of sheath tubes 28 are embedded substantially horizontally in the connecting portions 110 and 112 so as not to protrude from the mating surfaces 110E and 112E, and a connecting hole 29 is formed by the sheath tubes 28.

  Next, the joining method of the precast concrete structural member joining structure 100 according to the third embodiment will be described. Note that the method will be appropriately omitted as in the first embodiment.

  As shown in FIG. 14A, the connecting portions 110 and 112 of the beam member 14 are combined with the connecting portion 106 of the beam member 12 placed on a column member (not shown) from above or from the side and connected. The connecting portion 106 is inserted between the portions 110 and 112 (combination process). At this time, the installation height of the beam member 14 is adjusted so that the center of the connecting hole 21 formed in the connecting portion 106 and the center of the connecting hole 29 formed in the connecting portions 110 and 112 substantially coincide with each other. . FIG. 14A shows a state in which the connecting portions 110 and 112 of the beam member 14 are assembled from above.

  Next, as shown in FIG. 14A or FIG. 14B, the pin member 22 is penetrated in the order of the connection holes 29, 21, 29 from the side surface 110D side of the connection part 110 (connection process), and each sheath tube is inserted. 20 and 28 are filled with a curing material 38. Further, the hardening material 38 is filled in the gap between the connecting portion 106 and the connecting portions 110 and 112, the gap between the notch portion 102 and the connecting portion 110, and the gap between the notch portion 104 and the connecting portion 112.

  Thus, by filling the sheath tubes 20 and 28 with the curing material 38, the pin member 22 is fixed in the sheath tubes 20 and 28, and shearing forces acting on the connecting portions 106, 110, and 112 are transmitted to each other. The Further, by filling the joint or the like between the connecting portion 106 and the connecting portions 110 and 112 with the hardening material 38, the connecting portion 106 and the connecting portions 110 and 112 are brought into close contact with each other, and the stress at the connecting portions 106, 110, and 112 is Good transmission.

  Next, operations and effects of the precast concrete structural member joining structure 100 according to the third embodiment will be described.

  As shown in FIG. 14A, after the coupling portion 106 and the coupling portions 110 and 112 are combined, the coupling portion 106 and the coupling portions 110 and 112 are connected by the pin member 22 that penetrates the coupling portion 110 from the lateral side surface 110D. By connecting, the connecting portions 110 and 112 of the beam member 14 can be combined with the connecting portion 106 of the beam member 12 from above and from the lateral direction. Therefore, the beam member 14 can be joined by moving upward or laterally. Therefore, the moving direction of the beam member 14 is not limited to the horizontal direction, and the degree of freedom in construction is improved.

  In addition, the cross-sectional area of the connecting portion 106 of the beam member 12 decreases toward the tip. Therefore, the cross-sectional areas of the connecting portions 110 and 112 of the beam member 14 combined with the connecting portion 106 increase toward the roots of the connecting portions 110 and 112. Further, by providing the notch portion 108, the cross-sectional area of the end portion of the beam member 14 gradually increases from the end face 14A toward the back wall surface 108A of the notch portion 108, and resists a bending moment caused by a constant load. The structural cross section (cross section rigidity) at the end of the beam member 14 to be increased is increased. Therefore, the crack which arises in the base part vicinity of the connection parts 110 and 112 is suppressed. Furthermore, by providing the notch portion 108, the change in the cross-sectional area near the roots of the coupling portions 110 and 112 becomes moderate, and the stress concentration is alleviated. Therefore, the opening (cracking) of the joint surface between the vertical surface 106A of the connecting portion 106 and the back wall surface 108A of the notch portion 108 is suppressed.

  Similarly to the beam member 14, cracks generated near the base of the connecting portion 106 of the beam member 12 are suppressed, and the joint surface between the end surface 12A of the beam member 12 and the vertical surfaces 110C and 112C of the connecting portions 110 and 112 is suppressed. Opening is suppressed. Furthermore, since the connecting portion 106 is inserted between the connecting portions 110 and 112, the adhesion area of the hardened material 38 is increased compared to the first embodiment, and the stress transmission at the connecting portions 106, 110, and 112 is good. It becomes.

  In the present embodiment, one connecting portion 106 is provided at the end of the beam member 12 and two connecting portions 110 and 112 are provided at the end of the beam member 14. You may provide a some connection part in a part. In this case, the number of connecting portions corresponding to the connecting portions of the beam member 12 may be provided at the end of the beam member 14.

  In all of the above embodiments, the beam member 12 as the first structural member and the beam member 14 as the second structural member are joined. However, as shown in FIG. 1 structural member) and the upper column member 124 (second structural member) made of PCa may be joined. That is, the notch 16 and the connecting portion 18 are provided at the end of the lower pillar member 122, and the notch 24 and the connecting portion 26 are provided at the end of the upper pillar member 124. In this case, the connecting portion 26 can be combined from above and in the lateral direction with respect to the connecting portion 18 of the installed lower column member 122. Moreover, the crack in a junction part and the opening (crack) of a junction surface can be suppressed.

  In all the embodiments described above, it is preferable to provide a cotter on the mating surface of the connecting portion or the joint surface between the connecting portion and the notch portion. This is because the provision of the cotter increases the adhesion of the hardener and improves the transmission of the shearing force. In addition, what is necessary is just to use the grout material generally used for a hardening material, and mortar, an epoxy resin, etc. can be used.

  In all the above embodiments, the connection hole is formed by embedding the sheath tube substantially horizontally in the connection portion, but the connection hole may be formed by embedding the sheath tube obliquely. Further, the number and arrangement of the sheath tubes are not limited to those described above, and can be appropriately changed according to the design strength. Further, the connecting hole is formed by embedding a sheath tube in the connecting portion. However, the present invention is not limited to this, and a cylindrical member is disposed at a position where the connecting holes 21 and 29 are formed, and after the concrete is hardened, the cylindrical shape is formed. The connecting hole may be formed by removing the member. Moreover, you may form a connection hole by perforation.

  Further, a PC steel rod may be used instead of the pin member 22 as the connecting means. By applying prestress to the PC steel rod, the compressive force acting on the mating surface of the connecting portion may be increased, and the shear force may be transmitted by the frictional force.

  Furthermore, for the convenience of explanation, the reinforcing bars and shear reinforcing bars to be arranged in the beam members and column members have been omitted as appropriate, but if they are appropriately provided according to the strength required for the beam members and column members. good. The beam members 12 and 14 are not limited to reinforced concrete, but may be steel reinforced concrete or prestressed concrete.

  The first to third embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and the first to third embodiments may be used in combination. Of course, various embodiments can be implemented without departing from the scope of the invention.

(A), (B) is a perspective view which shows the joining structure of the precast concrete structure member based on the 1st Embodiment of this invention. (A) is a top view which shows the joining structure of the precast concrete structure member based on the 1st Embodiment of this invention, (B) is a side view. 2A is a sectional view taken along line 1-1 in FIG. 2A or FIG. 2B, FIG. 2B is a sectional view taken along line 2-2, FIG. -4 sectional view, (E) is a 5-5 sectional view. (A) is a top view which shows the joining structure of the precast concrete structure member based on the 1st Embodiment of this invention, (B) is a side view. (A) is a top view which shows the comparative example of the joining structure of the precast concrete structural member which concerns on the 1st Embodiment of this invention, (B) is a side view. (A) is a schematic diagram of a 6-6 line section of Drawing 5 (B), and (B) is a schematic diagram of Drawing 3 (E). (A), (B) is a perspective view which shows the modification of the joining structure of the precast concrete structure member based on the 1st Embodiment of this invention. It is a perspective view which shows the modification of the joining structure of the precast concrete structure member which concerns on the 1st Embodiment of this invention. It is the 8-8 sectional view taken on the line after combining the beam members of FIG. (A), (B) is a perspective view which shows the joining structure of the precast concrete structure member based on the 2nd Embodiment of this invention. It is a perspective view which shows the modification of the joining structure of the precast concrete structure member which concerns on the 2nd Embodiment of this invention. (A), (B) is a perspective view which shows the modification of the joining structure of the precast concrete structure member based on the 2nd Embodiment of this invention. (A), (B) is a perspective view which shows the modification of the joining structure of the precast concrete structure member based on the 2nd Embodiment of this invention. (A), (B) is a perspective view which shows the joining structure of the precast concrete structure member based on the 3rd Embodiment of this invention. It is a perspective view which shows the modification of the joining structure of the precast concrete structure member which concerns on the 1st-3rd embodiment of this invention. It is explanatory drawing which shows the joining structure of the conventional beam members. It is explanatory drawing which shows the joining structure of the conventional beam members.

Explanation of symbols

10 Precast concrete structural member joint structure 12 Beam member (first structural member)
14 Beam member (second structural member)
16B Upper slope (second upper slope)
18 connecting part (first connecting part)
18B Upper slope (first upper slope)
18D Lateral side surface 18E Mating surface (first mating surface)
18I Lower surface 18H Upper surface 22 Pin member (connection means)
24B Lower slope (second lower slope)
26 connecting part (second connecting part)
26B Lower slope (first lower slope)
26E mating surface (second mating surface)
26I Lower surface 26H Upper surface 46 Stat bolt (connection means)
54 Nut (connection means)
56 bolts (connection means)
80 Precast concrete structural member joint structure 100 Precast concrete structural member joint structure 102B Upper slope (second upper slope)
106 connecting part (first connecting part)
106B Upper slope (first upper slope)
108B Lower slope (second lower slope)
110 connecting part (second connecting part)
110B Lower slope (first lower slope)
112 connecting part (second connecting part)
112B Lower slope (first lower slope)
122 Lower pillar member (first structural member)
124 Upper pillar member (second structural member)

Claims (5)

A first structural member made of precast concrete;
A second structural member made of precast concrete joined to the first structural member;
A first connecting portion extending from the end surface of the first structural member in the material axis direction of the first structural member, and having a cross-sectional area that decreases toward the tip portion;
Extending from the end surface of the second structural member in the material axis direction of the second structural member, the cross-sectional area decreases toward the tip, and is combined with the first connecting portion from above and from the lateral direction. A second connecting portion that is identical to the outer shape;
A connecting means penetrating from an outer surface of the first connecting portion and connecting the first connecting portion and the second connecting portion;
A precast concrete structural member joining structure. The first structural member and the second structural member are beam members;
The precast concrete structural member joining structure according to claim 1, wherein the connecting means is penetrated from a lateral side surface of the first connecting portion to connect the first connecting portion and the second connecting portion. A first upper slope that is provided at a distal end portion of the first connection portion and is inclined from the upper surface side to the lower surface side of the first connection portion;
A second lower slope formed by cutting out an end surface of the second structural member, and the first upper slope being aligned with the second lower slope;
A first lower slope inclined from the lower surface side to the upper surface side of the second coupling portion provided at the distal end portion of the second coupling portion;
A second upper slope formed by cutting out an end surface of the first structural member, the first lower slope being combined, and
The precast concrete structural member joint structure according to claim 2, comprising: A first mating surface of the first coupling portion to be combined with the second coupling portion is a slope inclined toward a lateral side surface of the first coupling portion;
The precast according to any one of claims 1 to 3, wherein a second mating surface of the second coupling portion combined with the first coupling portion is a slope inclined toward a lateral side surface of the second coupling portion. Concrete structure joint structure. A first structural member made of precast concrete;
A second structural member made of precast concrete joined to the first structural member;
Have
The first structural member extends from the end surface of the first structural member in the material axis direction of the first structural member, and the cross-sectional area decreases toward the tip portion. A combination step of combining the second connecting portion extending in the material axis direction and having a cross-sectional area that decreases toward the tip portion from above or from the lateral direction;
A connecting step of connecting the first connecting part and the second connecting part by connecting means penetrating the first connecting part from the outer surface in a state where the second connecting part is combined with the first connecting part,
A method for joining precast concrete structural members.

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