JP6503496B2 - Pile head connection structure - Google Patents

Description

  The present invention relates to a pile head joint structure used for a joint between a pile head of a foundation pile such as a steel pipe pile or an SC pile and a foundation concrete portion of a building.

  As a pile head joint structure conventionally used for the joint part of the pile head of foundation piles, such as steel pipe pile or SC pile (concrete with outer shell steel pipe), and the foundation concrete part of a building, the pile head of foundation pile There was a thing which welds a reinforcement rebar on the peripheral face of a part (refer to patent documents 1).

  11 to 13 are diagrams referred to in order to explain the conventional pile head joint structure 2.

  The conventional pile head joint structure 2 is, as shown in FIG. 11, a steel pipe pile 4 having a pile head 4a at its upper end, a plurality of reinforcing bars 6, and a foundation concrete 8 placed around them. It was configured with.

  The steel pipe pile 4 is formed in a cylindrical shape (see FIG. 12) having an axial hole extending in the vertical direction in the drawing, and its lower end is deeply embedded until it hits a hard place in the foundation ground 3. Further, the upper end portion of the steel pipe pile 4 protrudes upward from the upper surface of the foundation ground 3, and the upper end portion is the pile head 4 a of the steel pipe pile 4.

  The lower end portions of a plurality of reinforcing bars 6 extending in the longitudinal direction of the steel pipe pile 4 are integrally formed on the outer peripheral surface 4b of the pile head 4a by welding a welded portion W (see FIG. 12) Were joined together. Further, as shown in FIG. 12, the plurality of reinforcing bars 6 are arranged such that the length direction thereof is along the length direction of the outer peripheral surface 4b of the pile head 4a, and the cross section thereof is a circle of the outer peripheral surface 4b. At intervals in the circumferential direction, the longitudinal directions were arranged parallel to one another.

  And, as shown in FIG. 11, the foundation concrete 8 is cast on the periphery of the foundation ground 3 so that the pile head 4a of the steel pipe pile 4 and the reinforcing rebar 6 are embedded in the inside thereof, and reinforced. It was formed in a substantially rectangular parallelepiped shape having an upper surface at a position higher than the height position of the upper end of the reinforcing bar 6.

  Such a conventional pile head joint structure 2 includes the pile head 4 a of the steel pipe pile 4 and the pile head when the seismic force F and the bending moment M as shown in FIG. The foundation concrete 8 in contact with the upper end face 4c of 4a, the reinforcement bar 6 and the foundation concrete 8 in contact with the reinforcement bar 6 are loaded.

  Here, in FIG. 13, for the convenience of description, the reinforcing rebars 6 other than the reinforcing rebars 6 located on the left and right outsides of the conventional pile head joint structure 2 are omitted.

  The bending moment M1 in FIG. 13 represents a bending moment that acts to resist the bending moment M. The bending moment M1 is generated by the tensile force T generated on the reinforcing bar 6 on the right side in the drawing when the bending moment M acts, and the foundation concrete 8 in contact with the upper end surface 4c of the steel pipe pile 4 is the upper end surface 4c of the steel pipe pile 4 The left side of the figure is generated by the compression force C which pushes the upper side from above.

JP, 2006-029040, A

  In recent years, high bearing capacity and strength of foundation piles such as steel pipe piles 4 have rapidly progressed, and it becomes possible to reduce the number of steel pipe piles 4 required to support one pillar, and one pillar It is also carried out to support by the steel pipe pile 4 of this. Moreover, the outer diameter size of the steel pipe pile 4 can also be made smaller than before.

  However, when the number of the steel pipe piles 4 decreases, there is a problem that the horizontal force such as an earthquake or the like which the steel pipe pile 4 bears by that amount is increased.

  As a measure to increase the horizontal force that the steel pipe pile 4 bears, it is conceivable to increase the number of reinforcing bars 6 joined to the outer peripheral surface 4 b of the pile head 4 a of the steel pipe pile 4.

  However, in the conventional pile head joint structure 2, beam reinforcements of foundation beams (not shown) orthogonal to each other, main reinforcements of columns (not shown), etc. in the foundation concrete 8 and above the pile head 4a of the steel pipe pile 4 As the diameter of the steel pipe pile 4 decreases and the number of reinforcement bars 6 joined to the steel pipe pile 4 increases, the main bars of these beam bars and columns and the reinforcement bars 6 There is a problem that they interfere with each other and a situation occurs in which it is not possible to arrange reinforcement bars 6 more than a certain number, i.

  Moreover, in the conventional pile head joint structure 2, since the reinforcing rebar 6 is joined to the outer peripheral surface 4b of the pile head 4a by welding, the material having poor weldability is the material of the reinforcing bar 6 even if it has high strength. There is also a problem that it can not be used as

  Therefore, in view of the above problems, the present invention can effectively reinforce the joint between the pile head of the foundation pile and the foundation concrete, and can use reinforcing rebar made of a material having poor weldability. It is an object of the present invention to provide a pile head joint structure which can reduce the number of reinforcing bars and can eliminate over-consolidated distribution bars above the pile head.

In order to solve the above problems, a pile head joint structure according to the present invention is:
In a pile head joint structure in which a pile head of a foundation pile is embedded in a foundation concrete and the foundation pile and the foundation concrete are integrally joined through reinforcing bars,
And a plurality of joining members to which the lower ends of the reinforcing bars are joined,
The plurality of joining members are joined to the outer peripheral surface of the pile head at intervals, and the length in the direction corresponding to the circumferential direction of the pile head is the radial direction of the pile head Longer than the corresponding direction length,
Each of the plurality of joining members is formed of a single solid member having an upper surface substantially parallel to the upper end surface of the pile head and a side surface opposite to the outer peripheral surface of the pile head,
A plurality of through holes through which the lower end portion of the reinforcing bar can be inserted are formed on the upper surface of the joining member.

Moreover, the pile head joint structure according to the present invention is
The joining member is formed in a comb-like plate shape having an inner circular arc surface and an outer circular arc surface, and the inner circular arc surface is disposed so as to face the outer peripheral surface of the pile head. It is characterized in that it is joined to the outer peripheral surface of the part.
Moreover, the pile head joint structure according to the present invention is
A length in a direction corresponding to an axial direction of the pile head of the joint member is longer than a length in a direction corresponding to a radial direction of the pile head.

Moreover, the pile head joint structure according to the present invention is
The sum of the joint lengths in the circumferential direction of the pile head of the plurality of joint members and the pile head is set to a ratio of 50% or more of the circumferential length of the pile head It is characterized by

Moreover, the pile head joint structure according to the present invention is
The joining member is characterized in that the upper end face thereof is disposed below the upper end face of the pile head and joined to the outer peripheral surface of the pile head.

According to such a pile head joint structure of the present invention,
In a pile head joint structure in which a pile head of a foundation pile is embedded in a foundation concrete and the foundation pile and the foundation concrete are integrally joined through reinforcing bars,
And a plurality of joining members to which the lower ends of the reinforcing bars are joined,
The plurality of joining members are joined to the outer peripheral surface of the pile head at intervals, and the length in the direction corresponding to the circumferential direction of the pile head is the radial direction of the pile head Longer than the corresponding direction length,
Each of the plurality of joining members is formed of a single solid member having an upper surface substantially parallel to the upper end surface of the pile head and a side surface opposite to the outer peripheral surface of the pile head,
By forming a plurality of through holes through which the lower end portion of the reinforcing bar can be inserted, on the upper surface of the joining member,
It is possible to effectively reinforce the joint between the pile head of the foundation pile and the foundation concrete, and it is possible to use a reinforcing rebar made of a material having poor weldability, and to reduce the number of reinforcing bars, It is possible to eliminate over-packed rebars above the pile head.

It is a side view of pile head joined structure 40 concerning a 1st embodiment of the present invention in foundation concrete 48. As shown in FIG. It is an AA arrow directional cross-sectional view of the pile head joined structure 40 in FIG. It is a figure which shows the joining member 42 in FIG. 1, Comprising: FIG. 3 (a) is the top view, FIG.3 (b) is the side view. It is the partial cross section enlarged view which expands and shows the joining member 42 vicinity in the pile-head joined structure 40 of FIG. It is a side view which abbreviate | omits and shows one part of the joining member 42 and the reinforcement rebar 46 in the pile-head joined structure 40 of FIG. It is a side view of pile head joined structure 60 concerning a 2nd embodiment of the present invention in foundation concrete 48. It is a BB arrow directional cross-sectional view of the pile head joint structure 60 in FIG. It is a side view of pile head joined structure 70 concerning a 3rd embodiment of the present invention in foundation concrete 48. It is a top view of the pile head junction structure 70 in FIG. It is the partial cross section enlarged view which expands and shows the joining member 72 vicinity in the pile-head joined structure 70 of FIG. It is a side view which shows the conventional pile head joint structure 2. As shown in FIG. It is a CC arrow directional cross-sectional view of the pile head joint structure 2 in FIG. While expanding and showing a part of pile head joint structure 2 in FIG. 11, it is a schematic fragmentary enlarged view which abbreviate | omits and shows a part of reinforcement rebar 6. As shown in FIG.

  Hereinafter, an embodiment for carrying out a pile head joint structure according to the present invention will be specifically described based on the drawings.

  FIGS. 1-5 is a figure referred in order to demonstrate the pile head joint structure 40 which concerns on the 1st Embodiment of this invention.

  As shown in FIG. 1, the pile head joint structure 40 according to the present embodiment includes a steel pipe pile 44 (base pile) having a pile head 44 a, a plurality of joint members 42, and a plurality of reinforcing bars 46. A substantially rectangular base concrete 48 formed by being placed around these and above the foundation ground 3 is provided.

  The steel pipe pile 44 is formed in a cylindrical shape (see FIG. 2) having an axial hole extending in the vertical direction in FIG. 1, and the lower end thereof is embedded in the foundation ground 3 until it hits the rock deeply. Further, the upper end portion of the steel pipe pile 44 protrudes upward from the foundation ground 3, and the upper end portion protruding upward from the foundation ground 3 of the steel pipe pile 44 is a pile head 44 a.

  As shown in FIG. 2, the plurality of joining members 42 are arranged along the circumferential direction of the outer peripheral surface 44 b of the pile head 44 a and at an interval from each other in the same direction. And as shown in FIG. 1, the some joining member 42 is integrally joined to the outer peripheral surface 44b of the pile head 44a by welding.

  The joining member 42 is formed in a comb-like plate shape having an inner arc surface 42a and an outer arc surface 42b as shown in FIGS. 3A and 3B, and is formed at the lower end of the reinforcing bar 46 Two through holes 42c for loosely inserting the male screw portion 46a are formed at intervals from each other.

  The joining member 42 is formed to have a length in the direction corresponding to the circumferential direction of the pile head 44a longer than the length in the direction corresponding to the radial direction of the pile head 44a. In other words, the arc length of the inner arc surface 42a and the outer arc surface 42b of the joining member 42 is formed longer than the length of a straight line connecting the inner arc surface 42a and the outer arc surface 42b.

  As shown in FIG. 4, the length of the joining member 42 in the direction corresponding to the axial direction (vertical direction in the figure) of the pile head 44a is the radial direction of the pile head 44a (horizontal direction in the figure It is formed longer than the length in the direction corresponding to.

  The upper surface 42 d of the joint member 42 is disposed substantially parallel to the upper end surface 44 c of the steel pipe pile 44 and lower than the height of the upper end surface 44 c of the pile head 44 a.

  The joint member 42 is disposed with a space between it and the outer peripheral surface 44 b so that the inner circular arc surface 42 a faces the outer peripheral surface 44 b of the pile head 44 a, and the inner circular arc surface 42 a and the pile head 44 a By welding the outer circumferential surface 44 b at the weld portion W, the outer circumferential surface 44 b is integrally joined to the outer circumferential surface 44 b of the pile head 44 a.

  As shown in FIG. 4, each of the plurality of reinforcing bars 46 is loosely inserted in each of the through holes 42 c of the joining member 42 by the male screw portion 46 a formed at the lower end in the length direction (vertical direction in the figure) The nut member 50 is screwed to the reinforcing bar 46 on the upper surface 42 d side and the lower surface 42 e side of the joint member 42 so as to be integrally joined to the joint member 42 (screw fastening).

  As shown in FIG. 2, each of the reinforcing bars 46 positioned relative to each other by joining the lower end portion to the joining member 42 is the circumference of the pile head 44 a of the steel pipe pile 44 in the foundation concrete 48. They are horizontally spaced from each other so as to surround them, and are disposed radially outward of the outer circumferential surface 44b of the pile head 44a.

  As shown in FIG. 4, on the outer peripheral portion of the reinforcing bar 46, a rib 46b extending in a substantially parallel direction and a substantially vertical direction in the length direction is formed so as to protrude outward from the outer peripheral portion. The reinforcing bar 46 can be fixed to the surrounding concrete concrete 48 by the rib 46 b.

  And, as shown in FIG. 1, the foundation concrete 48 is surrounded on the foundation ground 3 so as to embed the joint member 42, the pile head 44 a of the steel pipe pile 44, and the reinforcement bar 46 inside thereof. And is formed in a substantially rectangular parallelepiped shape having an upper surface at a position higher than the height position of the upper end of the reinforcing bar 46.

  Next, based on FIG. 5, the operation and effects of the pile head joint structure 40 according to the present embodiment will be described.

  In the pile head joint structure 40 according to the present embodiment, the pile head 44a of the steel pipe pile 44 and the pile head when the seismic force F and the bending moment M as shown in FIG. Not only the foundation concrete 48 in contact with the upper end face 44c of the portion 44a, the reinforcement bar 46 and the foundation concrete 48 in contact with the reinforcement bar 46, the joint member 42 and the foundation concrete 48 in contact with the upper surface 42d of the joint member 42 are also borne It can be done.

  Here, in FIG. 5, for convenience of explanation, the joint members 42 and the reinforcement bars 46 other than the joint members 42 and the reinforcement bars 46 located on the left and right sides of the pile head joint structure 40 according to the present embodiment are omitted. Is shown.

  The bending moment M2 in FIG. 5 represents a bending moment that acts to resist the bending moment M. The bending moment M2 is generated by the tensile force T generated on the reinforcing bar 46 on the right side in the drawing when the bending moment M acts, and the foundation concrete 48 in contact with the upper end surface 44c of the steel pipe pile 44 is the upper end surface 44c of the steel pipe pile 44 Not only the compressive force C pushing the left side portion in the figure from above but also the foundation concrete 48 in contact with the upper face 42d of the joint member 42 acts by the compressive force C1 pushing the top face 42d of the joint member 42 located on the left side in the figure It is supposed to be.

  In such a pile head joint structure 40, the bending moment M2 acting to resist the bending moment M can be made larger than the bending moment M1 acting in the conventional pile head joint structure 2 Therefore, the number of reinforcing bars 46 joined to the joining member 42 can be reduced accordingly. As a result, it is possible to eliminate overcrowded distribution lines above the pile head 44a.

  Further, in the pile head joint structure 40 according to the present embodiment, by increasing the surface area of the upper surface 42d of the joint member 42, the above-mentioned compressive force C1 can be more effectively exerted by that amount, and The joint between the pile head 44 a of the foundation pile 44 and the foundation concrete 48 can be reinforced more effectively by the amount.

  However, if the length dimension in the radial direction of the pile head 44a in the joint member 42 is made too large in order to increase the surface area of the upper surface 42d of the joint member 42, the space near the outer peripheral surface 44b of the pile head 44a is effective. It may become an obstacle to the joint work of the pile head 44 a of the steel pipe pile 44 and the foundation concrete 48.

  Therefore, in order to increase the surface area of the top surface 42d of the joining member, it is desirable to increase the circumferential length dimension of the pile head 44a of the joining member 42. Specifically, the sum of the joint lengths of the plurality of joint members 42 and the pile head 44a in the circumferential direction of the pile head 44a is the circumferential length of the outer circumferential surface 44b of the pile head 44a. It is desirable that the ratio be set to 50% or more.

  Moreover, in the pile head joint structure 40 according to the present embodiment, in the joint member 42, the length in the direction corresponding to the circumferential direction of the pile head 44a corresponds to the radial direction of the pile head 44a. Since it is formed longer than the length in the direction, compared with the case where it is formed shorter than the length in the direction corresponding to the radial direction of the pile head 44a, the joint member 42 and the pile head 44a Since the moment applied to the weld can be reduced, the amount of weld in the weld can be reduced.

  Further, in the pile head joint structure 40 according to the present embodiment, the inner circular arc surface 42a of the joint member 42 and the outer peripheral surface 44b of the pile head 44a are spaced apart from each other, and they are joined by welding. Therefore, as compared with the fillet welding in which the upper surface 42d and the lower surface 42e of the joint member 42 and the outer peripheral surface 44b of the pile head 44a are joined by welding, the welding operation is difficult from the lower surface 42e side of the joint member 42 The welding operation can be easily performed because the welding of the

  Moreover, in the pile head joint structure 40 according to the present embodiment, in the joint member 42, the length in the direction corresponding to the axial direction of the pile head 44a is the direction corresponding to the radial direction of the pile head 44a. Of the inner arc surface 42a of the joint member 42 and the pile head 44a, as compared with the case where the pile head 44a is formed shorter than the length in the direction corresponding to the radial direction of the pile head 44a. The effective cross-sectional area at the time of welding the outer peripheral surface 44b can be enlarged, and the joint strength of the joint member 42 and the pile head 44a can be improved.

  For this reason, the stress transmission between the pile head 44a of the steel pipe pile 44 and the reinforcing rebar 46 can be made smooth via the joint member 42, and the above-mentioned tensile force T can be effectively exerted. The joint between the pile head 44 a of the pile 44 and the foundation concrete 48 can be effectively reinforced.

  Further, in the pile head joint structure 40 according to the present embodiment, the upper surface 42d of the joint member 42 is disposed below the upper end surface 44c of the pile head 44a, so it is horizontal with the upper end surface 44c of the pile head 44a. The compressive force C1 is effectively applied to the bending moment M acting in the counterclockwise direction in FIG. 5 at the pile head 44a as compared with the case where the pile head 44a is disposed above the upper end surface 44c of the pile head 44a. It can be done.

  Moreover, in the pile head joint structure 40 according to the present embodiment, the reinforcing rebar 46 whose lower end is joined to the joint member 42 is disposed radially outward of the outer circumferential surface 44 b of the pile head 44 a Therefore, over-reinforcement rebars above the pile head portion 44a can be eliminated.

  In addition, since the lower end portion of the reinforcing bar 46 in the pile head joint structure 40 according to the present embodiment is joined to the joint member 42 by screw fastening, the weldability is poor even with high strength. A material can be used as the material of the reinforcing bar 46.

  Therefore, as described above, according to the pile head joint structure 40 according to the present embodiment, the joint between the pile head 44 a of the foundation pile 44 and the foundation concrete 48 can be effectively reinforced, and The reinforcing rebar 46 made of a material having poor weldability can be used, and the number of reinforcing bars 46 can be reduced, and over-consolidated rebars above the pile head 44a can be eliminated.

  Further, since the joining member 42 in the pile head joining structure 40 according to the present embodiment joins the two reinforcing bars 46, the number of welding points can be reduced along with the number of joining members 42. , Can improve the workability.

  FIG.6 and FIG.7 is a figure referred in order to demonstrate the pile head joint structure 60 which concerns on the 2nd Embodiment of this invention.

  The pile head joint structure 60 according to the present embodiment has a joint member 62 and a reinforcing bar 64 instead of the joint member 42 and the reinforcing bar 46 in the first embodiment as shown in FIG. The pile head joint structure 40 according to the first embodiment is different from the above-described one in the above-described point.

  As shown in FIG. 7, the joint member 62 is formed in a V-shaped (substantially hexagonal) plate shape having two inner side surfaces 62a and two outer side surfaces 62b, the first embodiment Is different from the bonding member 42 in the embodiment of FIG.

  The reinforcing bar 64 is different from the reinforcing bar 46 in the first embodiment in that an external thread portion 64a is formed at the upper end portion in the longitudinal direction as shown in FIG. Then, in the reinforcing rebar 64, the internal thread portions of the two nut members 66 (expanded diameter portions) are screwed to the external thread portion 64a, and the two nut members 66 are connected to the upper end portion thereof.

  Also by the pile head joint structure 60 according to the present embodiment, the same effect as that of the pile head joint structure 40 according to the first embodiment can be obtained.

  Further, in the pile head joint structure 60 according to the present embodiment, since the two nut members 66 are joined to the upper end portion of the reinforcing rebar 64, the adhesion between the reinforcing rebar 64 and the base concrete 48 is easily improved. be able to. Further, by fixing a fixing plate larger than the nut member 66 between the two nut members 66, the reinforcing reinforcing bar 64 can also effectively exhibit a fixing force.

  FIGS. 8-10 is a figure referred in order to demonstrate the pile head joint structure 70 which concerns on the 3rd Embodiment of this invention.

  The pile head joint structure 70 according to the present embodiment has a joint member 72 and a reinforcing bar 74 instead of the joint member 62 and the reinforcing bar 64 in the second embodiment as shown in FIG. The pile head joint structure 60 according to the second embodiment is different in that it is different from the above.

  Here, in FIG. 8, for convenience of explanation, a rib 74 b (see FIG. 10) formed so as to project outward from the outer peripheral portion of the reinforcing bar 74 is omitted.

  As shown in FIG. 9, the plurality of joining members 72 are arranged along the circumferential direction of the outer peripheral surface 44 b of the pile head 44 a and spaced from each other in the same direction. The plurality of joining members 42 are integrally joined to the outer peripheral surface 44b of the pile head 44a by welding.

  The joining member 72 is, as shown in FIG. 10, a horizontal plate 72a extending in the horizontal direction (horizontal direction in the figure), a vertical plate 72b projecting downward from the right end in the figure of the horizontal plate 72a, and Having two side plate portions 72c formed in a triangular shape such that the height from the horizontal plate portion 72a gradually decreases from the lower end portion of the plate portion 72b toward the left end portion in the drawing of the horizontal plate portion 72a It is configured.

  As shown in FIG. 9, the two side plate portions 72c of the joining member 72 are disposed to face each other at an interval in the horizontal direction, and support the horizontal plate portion 72a of the joining member 72 from the lower side. .

  The horizontal plate portion 72a of the joint member 72 is formed in a substantially pentagonal (see FIG. 9) plate shape, and as shown in FIG. 10, the male screw portion 74c formed at the lower end portion of the reinforcing rebar 74 is inserted loosely One through hole 72d is formed.

  The joining member 72 is formed to have a length in the direction corresponding to the circumferential direction of the pile head 44a longer than the length in the direction corresponding to the radial direction of the pile head 44a. For this reason, the sum of the lengths of the two sides joined to the pile head 44a of the horizontal plate portion 72a of the joint member 72 corresponds to the radial direction of the pile head 44a of the horizontal plate portion 72a of the joint member 72 (left and right in FIG. Direction) is formed longer than the length.

  As shown in FIG. 10, the sum of the lengths of the horizontal plate portion 72a and the vertical plate portion 72b of the joining member 72 in the direction corresponding to the axial direction (vertical direction in the figure) of the pile head 44a is the The horizontal plate portion 72a is formed to be longer than the length in the direction corresponding to the radial direction (the left and right direction in the figure) of the pile head 44a.

  The upper surface of the horizontal plate portion 72a of the joint member 72 is disposed substantially parallel to the upper end surface 44c of the steel pipe pile 44 and lower than the height of the upper end surface 44c of the pile head 44a.

  The joint member 72 is spaced from the outer peripheral surface 44b so that the inner surface (right side surface in FIG. 10) of the vertical plate portion 72b faces the outer peripheral surface 44b of the pile head 44a. By welding the inner side surface and the outer peripheral surface 44b of the pile head 44a at the welding portion W, the inner side surface and the outer peripheral surface 44b of the pile head 44a are integrally joined.

  As shown in FIG. 10, the male screw 74c formed at the lower end in the length direction (vertical direction in the drawing) of each of the plurality of reinforcing bars 74 is formed in the horizontal plate 72a of the joint member 72. It is inserted loosely into each of the through holes 72d, and on the lower surface side of the horizontal plate portion 72a, the nut member 50 is integrally joined to the joint member 72 by screwing to the reinforcing rebar 74 (screw fastening) .

  As shown in FIG. 9, each of the reinforcing bars 74 positioned relative to each other by joining the lower end portion to the joining member 72 forms the periphery of the pile head 44a of the steel pipe pile 44 in the foundation concrete 48. They are horizontally spaced from each other so as to surround them, and are disposed radially outward of the outer circumferential surface 44b of the pile head 44a.

  And as shown in FIG.8 and FIG.9, the bending end part 74a by which the reinforcement rebar 74 was bend | folded by the radial direction outer side of the pile head 44a in the upper end part is formed.

  Also by the pile head joint structure 70 according to the present embodiment, it is possible to obtain the same effect as the pile head joint structure 40 according to the first embodiment.

  Further, in the pile head joint structure 70 according to the present embodiment, since the joint member 72 is configured to have the horizontal plate portion 72a, the vertical plate portion 72b, and the two side plate portions 72c, the first and the first The weight of the joint member 72 can be reduced as compared with the joint members 42 and 62 in the pile head joint structure 40 and 60 according to the second embodiment.

  Further, in the pile head joint structure 70 according to the present embodiment, since the bent end 74a is formed at the upper end of the reinforcing bar 74, the adhesion between the reinforcing bar 64 and the foundation concrete 48 is easily improved. be able to.

  The present invention is not limited to the above embodiment, and various modifications can be made as long as the object of the present invention can be achieved.

  For example, in the pile head joint structure 40 according to the first embodiment, the steel pipe pile 44 is used as the foundation pile, but concrete is injected into the steel pipe as the foundation pile in the present invention You may use SC pile (concrete pile with outer shell steel pipe) etc. which were manufactured by compaction.

  Further, in the pile head joint structure 40 according to the first embodiment, as shown in FIG. 2, eight joint members 42 are joined to the outer peripheral surface 44 b of the pile head 44 a, but the pile head A plurality of two or more bonding members 42 may be bonded to the outer peripheral surface 44 b of the portion 44 a. In addition, as for the some joining member 42, it is desirable to arrange | position equally along the circumferential direction of the outer peripheral surface 44b of the pile head 44a.

  Further, in the pile head joint structure 40 according to the first embodiment, the joint member 42 is formed in a comb-like plate shape having the inner circular arc surface 42 a and the outer circular arc surface 42 b, but is limited to this shape As in the case of the bonding member 62 in the second embodiment, it may be formed in a polygonal plate shape having a plurality of side portions. Further, the bonding member may not be limited to a plate-like outer shape like the bonding member 72 in the third embodiment.

  In addition, the joint member 42 is disposed with a space between the outer circumferential surface 44 b and the outer circumferential surface 44 b so that the inner circular arc surface 42 a faces the outer circumferential surface 44 b of the pile head 44 a. A part of the joining member may be in contact with a part of the pile head as long as a gap for welding the end faces of each other is formed.

  Further, the gap formed between the joint member 42 and the outer peripheral surface 44b of the pile head 44a is a part or all of the above-mentioned gap by welding the joint member 42 and the outer peripheral surface 44b of the pile head 44a. In the case of being buried, the circumferential length dimension of the outer circumferential surface 44b of the pile head 44a in the portion to be buried is the circumferential direction of the pile head 44a of the plurality of joint members 42 and the pile head 44a. It may be included in the sum of the junction length dimensions of

  Further, in the pile head joint structure 40 according to the first embodiment, the male screw portion 46 a at the lower end portion of each of the plurality of reinforcing bars 46 is loosely inserted into each through hole 42 c of the joint member 42. The pair of nut members 50 are integrally joined to the joining member 42 by screwing them to the reinforcing bars 46, but it is sufficient if the joining members 42 and the reinforcing bars 46 are screw-fastened, for example, joining A female screw may be provided on the inner peripheral portion of the through hole 42c of the member 42, and the reinforcing bar 46 may be directly screwed to the joint member 42 using the female screw.

  Further, in the pile head joint structure 40 according to the first embodiment, two through holes 42c are formed in one joint member 42, and two reinforcing bars 46 are formed using these through holes 42c. However, one or more plural through holes are formed in one joint member 42, and one or more plural reinforcing bars are formed by using these through holes. May be joined.

  Further, in the pile head joint structure 40 according to the first embodiment, the inner arc surface 42a of the joint member 42 and the outer peripheral surface 44b of the pile head 44a are integrally joined by welding. The joint member and the pile head may be integrally joined by another welding method.

  Further, in the pile head joint structure 60 according to the second embodiment, although the two nut members 66 are coupled to the upper end portion of the reinforcing rebar 64, the number of the nut members 66 is not limited to two. It is preferable that the diameter is larger than that of the reinforcing bar 64, and it is not necessary to limit to the nut member.

  The upper end of the reinforcing bar 74 in the pile head joint structure 70 according to the third embodiment is bent outward in the radial direction of the pile head 44a, but is bent inward in the radial direction or in another direction. It may be done.

Reference Signs List 2 pile head joint structure 3 foundation ground 4 steel pipe pile 4a pile head 4b outer peripheral surface 4c upper end surface 6 reinforcing bar 8 foundation concrete 40 pile head joint structure 42 joint member 42a inner arc surface 42b outer arc surface 42c through hole 42d upper surface 42e lower surface 44 steel pipe pile 44a pile head 44b outer peripheral surface 44c upper end surface 46 reinforced rebar 46a male screw 46a rib 48 foundation concrete 50 nut member 60 pile head joint structure 62 joint member 62a inner side 62b outer surface 64 reinforcing steel bar 64a male screw 66 nut member 70 Pile Head Joint Structure 72 Joint Member 72a Horizontal Plate 72b Vertical Plate 72c Side Plate 72d Through Hole 74 Reinforcement Rebar 74a Folded End 74b Rib 74c Male Thread C, C1 Compressive Force F Seismic Force M, M1, M2 Bending Moment T tensile force W weld

Claims (5)

In a pile head joint structure in which a pile head of a foundation pile is embedded in a foundation concrete and the foundation pile and the foundation concrete are integrally joined through reinforcing bars,
And a plurality of joining members to which the lower ends of the reinforcing bars are joined,
The plurality of joining members are joined to the outer peripheral surface of the pile head at intervals, and the length in the direction corresponding to the circumferential direction of the pile head is the radial direction of the pile head Longer than the corresponding direction length,
Each of the plurality of joining members is formed of a single solid member having an upper surface substantially parallel to the upper end surface of the pile head and a side surface opposite to the outer peripheral surface of the pile head,
A plurality of through holes through which lower end portions of the reinforcing bars can be inserted are formed on the upper surface of the joint member. The joining member is formed in a comb-like plate shape having an inner circular arc surface and an outer circular arc surface, and the inner circular arc surface is disposed so as to face the outer peripheral surface of the pile head. It joined to the said outer peripheral surface of the part. The pile-head joined structure of Claim 1 characterized by the above-mentioned. The pile according to claim 1 or 2, wherein a length of a direction corresponding to an axial direction of the pile head of the joining member is longer than a length of a direction corresponding to a radial direction of the pile head. Head joint structure. The sum of the joint lengths in the circumferential direction of the pile head of the plurality of joint members and the pile head is set to a ratio of 50% or more of the circumferential length of the pile head. The pile head joint structure according to any one of claims 1 to 3, characterized in that The pile according to any one of claims 1 to 4, wherein the joining member has its upper end face disposed below the upper end face of the pile head and joined to the outer peripheral surface of the pile head. Head joint structure.

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