JP6892991B2 - Joint structure of wall member and foundation - Google Patents

Description

The present invention mainly relates to a joint structure between a wall member such as a CLT panel and a foundation in a wooden house.

As is well known, CLT (Cross Laminated Timber) is a thick panel in which layers of boards are laminated and bonded so that each layer is orthogonal to each other, and is established as the Japanese Agricultural Standard (JAS) under the name of orthogonal laminated board. Although it is also used as a building material for wall materials, floor materials, ceiling materials, etc., CLT itself is also a pillar and a beam. However, since the history of panel construction methods using this CLT in Japan is short, the actual situation is that the joints with the building components have not yet been sufficiently developed. Regarding the method of joining the CLT and the foundation, as shown in FIGS. 5 and 6, the ventilation spacer 33 is placed on the base 32 fastened to the foundation 31 with the anchor bolts 30 as in the conventional wooden shaft structure. The publication does not show a structure in which a CLT panel 34 is installed via a CLT panel 34, and the foundation 31 and the CLT panel 34 are sandwiched from both sides by an external steel plate 35 and fixed with a large number of screws 36. However, it is known as an actual construction method.

Further, as a construction method in which the structure / insulation panel is directly installed on the foundation without using the foundation, as shown in FIG. 2 of Patent Document 1, a plate fixed to the anchor reinforcing bar embedded in the foundation is attached from the side surface of the foundation. A structure is disclosed in which the foundation is projected upward and fixed to a wall panel with nails. Further, as shown in FIG. 1 of Patent Document 2, the wall panel is placed on the ventilation pedestal ring placed on the upper surface of the foundation, and the upper end portion of the anchor bolt embedded in the foundation is placed in the lower end portion of the wall panel. A structure that is projected and screwed and fixed with a screw is disclosed.

Japanese Unexamined Patent Publication No. 11-13149 JP-A-2009-97215

However, according to the above-mentioned prior art described in the unpublished material, it takes a lot of time and effort to lay the base 32 and to fix the steel panel 35 for fixing the base 32 and the CLT panel 34 by hitting a large number of screws 36. There is a problem. Further, there is a problem that the position must be displaced in order to avoid interference between the anchor bolt 30 penetrating the base 32 and the screw 36. Further, there is a problem that bending acts on the base 32 at the time of an earthquake and cracking occurs. In addition, since the CLT panel 34 is installed on the foundation 32, the anchor bolt 30 buried in the foundation 31 for fixing the foundation 32 and the main bar 37 of the foundation 31 both want to be arranged in the center of the material, but interfere with each other. As a result, there is a problem that bending acts on the base 32.

In order to solve the problem of installing the CLT panel 34 on the base 32 as described above, a technique of directly placing the wall member on the foundation described in Patent Document 1 or Patent Document 2 described above is used. However, in the invention described in Patent Document 1, the plate fixed to the anchor reinforcing bar embedded in the foundation is projected from the side surface of the foundation upward to the upper part of the foundation and fixed with a wall panel and a nail. Since it has a structure, it has a weak bearing capacity and has a problem that it is difficult to withstand the action of an earthquake or a force from the lateral direction. Further, in the invention described in Patent Document 2, the wall panel is placed on the ventilation pedestal ring placed on the upper surface of the foundation, and the upper end portion of the anchor bolt embedded in the foundation is projected into the lower end portion of the wall panel. Since the structure is screwed and fixed with screws, the connection between the foundation and the wall panel is limited to anchor bolts, and there is a problem that the connection strength is weak.

The present invention has been made to solve the above-mentioned problems, and the means thereof is that two reinforcing bars extending in the longitudinal direction are arranged at a central portion in the width direction with a substantially horizontal interval. wherein in the concrete, the lower two piles rods having a fixing plate downward tip at predetermined intervals to the lower end is welded and fixed sides of the foundation with the upper surface a predetermined width solidified around with concrete Te Is arranged in a direction substantially parallel to the longitudinal direction of the two reinforcing bars, is sandwiched so that the front and back surfaces face the two reinforcing bars, is buried and fixed together with the pile rod, and further, the above 2 Kuibo of this is disposed below the two reinforcing bars to fit within said concrete, the upper sides of the central portion of the two reinforcing bars extending in the longitudinal direction at the center in the width direction of the base A column base steel plate made of a rectangular vertically long thin metal plate protruding from the upper surface, a wall member having a slit formed upward from an opening on the bottom surface for accommodating the upper side portion, and the column. A mounting pin hole formed on the upper side of the leg steel plate and a wall pin hole formed by penetrating the slit of the wall member in a perpendicular direction, and a column base steel plate and a wall penetrating the mounting pin hole and the wall pin hole. The structure is a joint structure between a wall member and a foundation, which comprises a fastener for fastening the members.

Further , the wall member is a CLT panel. A ventilation spacer is interposed between the upper surface of the foundation and the bottom surface of the wall member. The fastener is a drift pin. The fastener is a bolt or a nut. The wall member is a wall material that also serves as a pillar. A plurality of pairs of slits of the column base steel plate and the wall member are installed in one wall member in the longitudinal direction of the foundation.

According to the joint structure of the wall member and the foundation of the present invention, since the upper side portion of the column base steel plate whose lower side portion is embedded and fixed in the foundation is housed in the slit from the opening on the bottom surface of the wall member, the column base steel plate The circumference is surrounded by wall members. Therefore, fasteners such as drift pins and bolts that penetrate and fix the mounting pin holes of the column base steel plate and the wall pin holes of the wall member come off from the wall member of the column base steel plate due to large vertical vibration during an earthquake. Can be prevented. In addition, since it is directly connected to the foundation, it does not require a foundation, so cracking due to bending of the foundation during an earthquake does not occur. Further, since it is only necessary to penetrate or drive the fastener from the wall pin hole on one surface of the wall member through the mounting pin hole of the column base steel plate so as to reach the wall pin hole on the other surface, it is troublesome to install. May be less. Further, the foundation and the wall member are connected by inserting the upper side portion of the column base steel plate protruding from the upper surface of the foundation into the slit through the opening opened in the longitudinal direction of the foundation on the bottom surface of the wall member. Therefore, compared to the conventional joint structure in which the metal fittings protruding upward from the side of the foundation are fixed on both sides of the wall panel with nails, the bearing capacity is stronger, and it is also resistant to earthquakes and lateral forces. Can withstand enough. Further, the connection between the foundation and the wall member is different from the conventional technique of using only anchor bolts, and the connection strength is increased.

Further, the lower side portion of the column base steel plate is sandwiched between two reinforcing bars and arranged substantially parallel to the longitudinal direction, and is embedded in concrete so that the front and back surfaces face the reinforcing bars. Therefore, even if stress is applied to the wall member in the direction perpendicular to the front and back surfaces of the lower side portion of the column base steel plate, the reinforcing bar buried in the concrete receives it and can stably support it.

In addition, since the pile rod is welded and fixed to the lower end of the lower side portion, the strength can be maintained even if the portion of the lower side portion of the column base steel plate to be buried and fixed in the concrete is reduced. In addition, the stress of the wall member can be received by the pile rod, which makes it more stable. Since Kuibo of which the fixing plate is provided below the tip, the upward stress on the column base steel sheet, such as by shaking wind or earthquakes on the wall member can be blocked by the fixing plate even when produced, and the bottom of the wall member Separation from the upper surface of the foundation can be prevented more firmly, and thus the separation of the column base steel plate from the concrete of the foundation can be prevented even more firmly.

When the wall member is a wall material that also serves as a pillar like a CLT panel, it is not necessary to provide a separate pillar or wall material, and construction is easy. Further, since it is a CLT panel, the cost of the interior material can be saved because the indoor side surface is beautiful even if it is exposed indoors as it is. Further, since it also acts as a structural material, it can also act as a pillar and simplify the structure of the building. Further, since there is only one column base steel material in the width direction of the upper surface of the foundation, even if the wall member is thin such as a CLT panel, only one slit is required, so that the strength of the wall member is sufficient. There is an advantage that it does not reduce.

By interposing a ventilation spacer between the upper surface of the foundation and the bottom surface of the wall member, it is possible to improve the air flow in the underfloor space without providing an opening for air flow in the bottom surface of the wall member.

When the fastener is a drift pin, it is only necessary to hammer the drift pin through the wall pin hole opened on one side of the wall member so that it reaches the wall member on the opposite side. Is easy. Further, since it can be driven so as not to be exposed on the inner surface of the wall member, the aesthetic appearance of the room is not spoiled.

When the fastener is a bolt or nut, insert the bolt from the wall pin hole opened on one side of the wall member until it comes out from the wall pin hole on the opposite wall member, and tighten and fix it with the nut. The work is easy because you only have to do it. Further, when removing the wall member, it is easy because it is only a work of loosening the nut and pulling out the bolt.

When a plurality of pairs of column base steel plates and slits of the wall member are installed on one wall member in the longitudinal direction of the foundation, the joint fixing structure of the foundation and the wall member can be stronger and more stable. ..

A perspective view immediately before joining the wall member and the foundation according to the embodiment of the present invention. FIG. 1 is a cross-sectional view taken along the line AA. Explanatory view of the perspective of the wall member and the foundation of the embodiment of the present invention joined. BB line sectional view of FIG. Explanatory view of the joint state of the wall member and the foundation of the conventional example Cross-sectional view taken along the line CC of FIG.

An embodiment of the joint structure between the wall member and the foundation of the present invention will be described below with reference to FIGS. 1 to 4. In the joint structure 1 between the wall member and the foundation of the embodiment, two reinforcing bars 2 extending in the longitudinal direction are arranged at a center in the width direction at intervals in the substantially horizontal direction, and the periphery thereof is solidified with concrete 3. A lower side portion 6a having a pile rod 5 fixed to the lower end portion of the concrete 3 of the foundation 4 having a width on the upper surface 4a is arranged in a direction substantially parallel to the longitudinal direction of the two reinforcing bars 2 and with respect to the reinforcing bars. A column base steel plate 6 made of a thin metal plate whose upper side portion 6b is exposed from the upper surface 4a of the foundation 4 and the upper side portion 6b are embedded and fixed together with the pile rod 5 so as to face the front and back surfaces. A wall member 7 made of a CLT panel or the like provided with a slit 7c formed upward from the opening 7b of the bottom surface 7a for storage, a mounting pin hole 6c formed in the upper side portion 6b of the column base steel plate 6, and a mounting pin hole 6c. A fastener formed by penetrating the slit 7c of the wall member 7 in a perpendicular direction and fastening the column base steel plate 6 and the wall member 7 through the mounting pin hole 6c and the wall pin hole 7d. 8 and the joint structure 1 of the wall member and the foundation provided with the above.

There are other reinforcing bars extending in the longitudinal direction or the vertical direction also in the vertical and horizontal directions of the two reinforcing bars 2 extending in the longitudinal direction and embedded at the center of the concrete 3 of the foundation 2 in the longitudinal direction at a predetermined interval. However, it is not limited well. Due to the presence of two reinforcing bars 2 extending in the longitudinal direction of the central portion in the width direction, the column base steel plate 6 sandwiched in parallel between these two reinforcing bars 2 is installed in the substantially central portion of the concrete 3. It will be. The width of the upper surface 4a of the foundation 4 is substantially the same as the thickness width of the wall member 7. A ventilation spacer 9 having a predetermined thickness is placed on the upper surface 4a of the foundation 4 in the longitudinal direction at a predetermined interval as needed, so that the underfloor space and the outside air can flow. In this embodiment, a cloth foundation is assumed as the foundation 4 of the building, but it may be a foundation of another type of building such as an independent foundation or a solid foundation.

The column base steel plate 6 is made of a rectangular vertically long metal thin plate, a lower side portion 6a is embedded in the concrete 3 of the foundation 4, and an upper side portion 6b protrudes from the upper surface 4a of the foundation 4. The number of pile rods 5 fixed to the lower end of the lower side portion 6a by welding or the like may be one or more, and the length thereof is lower than the reinforcing bar whose lower end is arranged in the longitudinal direction of the rising portion of the foundation 4. Although it is located in, it is desirable that it has a length that fits in the concrete 3. The material, length, and thickness of the pile rod 5 are appropriately selected and used depending on the structure of the building, and are not particularly limited. If necessary, a fixing plate 5a having a diameter larger than the cross-sectional area of the pile rod 5 is provided at the tip of the pile rod 5. As a result, even if an upward stress is generated from the wall member 7 through the column base steel material 6 to the pile rod 5 due to a typhoon or the like, drag is generated by the action of the fixing plate 5a, and the contact area with the concrete 3 is also large, so that it is strong. Can be fixed to.

The column base steel plate 6 is projected from the center of the two reinforcing bars 2 at the center of the width of the foundation 4 by a predetermined height at a predetermined interval substantially parallel to the reinforcing bars 6, and when necessary. In the same manner, the column base steel plates 6 are installed at predetermined intervals in the longitudinal direction of the foundation 2. In this installation, the column base steel plate 6 is attached to the mounting guide of the metal anchor ruler (not shown) before placing concrete on the concrete metal formwork in which the reinforcing bars 2 such as the main bars are assembled inside, and after the concrete is hardened. This can be done by removing the metal anchor ruler and metal formwork.

The length of the lower side portion 6a embedded in the foundation 4 and the length of the upper side portion 6b protruding from the upper surface 4a of the foundation 4 are appropriately determined depending on the type and structure of the building. Further, the size, shape, embedding length, protrusion length, installation interval, etc. of the plurality of column base steel plates 3 to be installed are not limited to being uniform, and the structure of the building and the eccentric load may be affected. It can be changed as appropriate depending on various factors such as where it is easy to hang and where it is not. Furthermore, it goes without saying that the metal type, outer shape, thickness of the metal thin plate, the number and size of the mounting pin holes 6c, etc. of the metal thin plate forming the column base steel plate 6 are also appropriately selected and changed depending on the structure of the building. is there.

As the wall member 7, a CLT panel is preferably used. This CLT panel is a thick panel in which thin plate layers are laminated and bonded so that fibers are orthogonal to each other in each layer. For example, a column having a rectangular shape having lengths of 3000 mm and 2000 mm in the vertical and horizontal directions thereof. It is also a structural member that also serves as a wall material. The CLT panel 7 is placed directly on the upper surface 4a of the foundation 4 or with the ventilation spacer 9 interposed therebetween.

When a CLT panel or the like as a wall member 7 is placed on the upper surface 4a of the foundation 4, as shown in FIG. 1, the suspended CLT panel 7 is placed from above the foundation 4 so that the opening 7b is true of the column base steel material 6. After being positioned at the top, it is gradually lowered downward as shown by the arrow a, and the upper side portion 6b of the column base steel material 6 is housed inside the slit 7c. Since the bottom surface 7a of one CLT panel 7 is provided with one slit 7c at both ends in the lateral direction, all the upper side portions 6b of the column base steel material 6 are housed inside these slits 7c. After aligning the opening 7b, lower it to fit and store it. A resin tape 10 is attached to the outer peripheral surface of the lower end portion of the CLT panel 7 and the corner of the bottom surface 7a to protect the CLT panel 7 from inhaling rainwater.

Further, the wall pin holes 7d are located at positions corresponding to the mounting pin holes 6c of the column base steel material 6 from one outer surface (front surface) forming the slit 7c of the CLT panel 7 toward the other outer surface (back surface). Since it is formed, when the column base steel material 6 is stored in the slit 7c, the mounting pin hole 6c and the wall pin hole 7d are in a straight line and are open. By inserting a drift pin or a bolt, which is a fastener 8, into the pin holes 7d and 6c opened in a straight line in the direction of arrow B and tightening and fixing the CLT panel 7, the joining structure 1 to the foundation 4 of the CLT panel 7 which is a wall member is formed. Will be built. When a drift pin is used, it can be firmly fixed so that it will not come out even if a force in the direction of vibration or twist is applied by hitting it strongly with a hammer when the drift pin is inserted through the opening of the wall pin hole 7d. In addition, it is easy to fix because it is only necessary to hit the drift pin. Further, by stopping the tip of the drift pin in the middle so as not to protrude from the other side surface (back surface) of the CLT panel 7, the side surface of the CLT panel 7 on the indoor side, which is the other side surface, can be kept clean. Similarly, when the fastener 8 is a bolt / nut, a bolt is inserted into the pin holes 7d and 6c opened in a straight line from one outer surface of the CLT panel 7 in the direction of arrow B, and the bolt protrudes to the other outer surface. It can be fixed by tightening the nut on the screw at the tip. In this case, the nut is exposed when the other outer surface is on the indoor side, but it can be visually confirmed that the nut is securely fastened. Further, when disassembling, the work is easy because it is only necessary to loosen the nut.

When the wall member 7 is a CLT panel, it can also be a structural material having a proof stress, so that it also serves as a pillar for supporting an upward load and a wall material. Therefore, for the right-angled joints of the CLT panels 7 at the corners of the foundation 4 and the planar joints between adjacent ones in the lateral direction, the buried and fixed positions of the column base steel 6 in the foundation 4 are determined so that the respective positions match. .. In the wall member and foundation joint structure 1 of the present invention, since the CLT panel 7 is directly placed and fixed on the upper surface 4a of the foundation 4 without interposing a base, the structural members can be saved and the construction labor can be saved accordingly. At the same time, it is possible to prevent the occurrence of distortion of the building due to the instability of the fixed state to the foundation of the foundation. In the present invention, an example in which a CLT panel is used as the wall member 7 has been described, but a laminated wood in which the laminated wood is branched, a large cross-section column, or the like can also be used.

Since this invention is a joint structure to the foundation of a wall member such as a CLT panel that also serves as a structural member that will be used more and more effectively in the future, it is effective for many new buildings, especially wooden houses and wooden collective houses. It is expected to be utilized.

1 Joint structure of wall member and foundation 2 Reinforcing bar 3 Concrete 4 Foundation 4a Top surface 5 Pile bar 5a Fixing plate 6 Column base steel plate 6a Lower side 6b Upper side 6c Mounting pin hole 7 CLT panel (wall member)
7a Bottom 7b Opening 7c Slit 7d Wall pin hole 8 Fastener 9 Ventilation spacer 10 Resin tape

Claims (7)

At the lower end of the foundation having a predetermined width on the upper surface, two reinforcing bars extending in the longitudinal direction are arranged at a distance in the substantially horizontal direction at the center in the width direction and the periphery is solidified with concrete. The lower side portion where two pile rods having a fixing plate provided at the lower tip at a predetermined interval are welded and fixed is arranged in a direction substantially parallel to the longitudinal direction of the two reinforcing bars and the two. It is sandwiched so that the front and back surfaces face the reinforcing bar and is buried and fixed together with the pile rod, and further, the two pile rods are arranged below the two reinforcing bars so as to fit in the concrete. A column base steel plate made of a rectangular vertically long metal thin plate whose upper side portion protrudes from the upper surface of the central portion of the central portion of the two reinforcing bars extending in the longitudinal direction at the center in the width direction of the foundation.
A wall member having a slit formed upward from the opening on the bottom surface for accommodating the upper side portion, and a wall member.
A mounting pin hole formed on the upper side of the column base steel plate, a wall pin hole formed by penetrating the slit of the wall member in a right angle direction, and a column base steel plate penetrating the mounting pin hole and the wall pin hole. And the fasteners that fasten the wall members,
A joint structure between a wall member and a foundation. The joint structure between a wall member and a foundation according to claim 1, wherein the wall member is a CLT panel. The joint structure between a wall member and a foundation according to claim 1, wherein a ventilation spacer is interposed between the upper surface of the foundation and the bottom surface of the wall member. The joint structure between a wall member and a foundation according to any one of claims 1 to 3, wherein the fastener is a drift pin. The joint structure between a wall member and a foundation according to any one of claims 1 to 3, wherein the fastener is a bolt or a nut. The joint structure between a wall member and a foundation according to any one of claims 1 to 5, wherein the wall member is a wall material that also serves as a pillar. The wall member according to any one of claims 1 to 6, wherein a plurality of pairs of slits of the column base steel plate and the wall member are installed in one wall member in the longitudinal direction of the foundation. And the joint structure of the foundation.

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