JP2007211428A - Brace connecting bolt, and seismic strengthening construction method for wooden building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brace connecting bolt which facilitates construction work by enabling construction work to be performed only by work from the outside of an exterior wall, which can shorten a construction period and which can reduce construction costs, and a seismic strengthening construction method for a wooden building. <P>SOLUTION: A mounting hole 27 is provided in the beam 24 of the wooden building H and the sill 21 or foundation 20 of the wooden building H in such a manner as to penetrate from the outside of the wooden building H; a bolt body 1 of the bracing connecting bolt A is inserted into the mounting hole 27 from the outside of the wooden building H; and the coming-off of the bolt body 1 is inhibited by an anti-coming-off means 5 which is operated from the same side. In this state, an end of the brace 26 is connected to the bolt body 1, and a nut 9 is screwed and tightened to the bolt body 1, so that the brace 26 can be provided in a stretched manner between the beam 24 and the sill 21 or the foundation 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brace connecting bolt used for improving the earthquake resistance of an existing wooden house and a seismic reinforcement method for a wooden house using the brace connecting bolt.

  Generally, wooden houses in Japan are built between a base, a base that is placed and fixed on a concrete foundation mainly built on the ground, a plurality of pillars that are erected on the top surface of the base, and It is comprised from the wall, the beam mounted on the said each pillar, and the roof set constructed above these beams. In this seed timber house, for example, the connection between the base and each pillar or between each pillar and beam is embedded, and this part is further reinforced by wedges or grazing.

  By the way, recently, earthquakes frequently occur in various places in Japan. However, the connection between the base and each pillar and each pillar and beam is vulnerable to rolls and pitches caused by the earthquake, and the pillars are particularly easily removed from the base. If the pillars are removed from the base in this way, the house will be in a state where the floor is wiped off at the bottom of the pillars, and it will collapse without a block.

  From this point, recently, the joint between the base and each pillar and the joint between each pillar and the beam are separately fixed with iron metal to reinforce locally, or a metal brace between the beam and the foundation. In order to prevent the pillar from coming out of the foundation as much as possible. For example, L-shaped hardware is provided between two pillars at the top and bottom, the upper part is joined to the beam near the pillar with bolts, and the lower part is anchored by anchoring the foundation on the foundation near the pillar To do. These upper and lower L-shaped hardwares are hooked with reinforcing bars with turnbuckles and fixed with bolts (see, for example, Patent Document 1).

In particular, wooden houses that were built before 1986 and have a floor area of 20-50 tsubo have no earthquake countermeasures. Therefore, local governments are pushing ahead with retrofitting to seismic structures in the form of supporting a part of the construction costs for these wooden houses.
JP-A-9-317006 (page 2-3, FIG. 1)

  For example, in the seismic reinforcement method according to Patent Document 1, when a new wooden house is constructed, it can be incorporated in the middle of the construction. However, in an existing wooden house, in order to bolt L-shaped hardware and two reinforcing bars, the corresponding furniture in the room is moved to a place where it does not get in the way, or the fold is raised or The work must be done after the floor and the outer walls have been removed. Moreover, after completion of the work, it is necessary to restore the folds, floors and outer walls to their original state.

  For this reason, not only a lot of troublesome work is forced, but also the construction period becomes long. Furthermore, even with the assistance of local governments, the financial self-pay is large, and the current situation is that many elderly people who are elderly people are hesitant to take up the construction work. It is highly desired.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and it is possible to perform construction only from the outside of the outer wall, and the construction is extremely simple, the construction period is short, the construction cost can be reduced, and The purpose is to provide a seismic reinforcement method for wooden houses.

  In order to achieve such an object, the brace connecting bolt according to the present invention is a brace connecting bolt that is inserted from the outside into a mounting hole provided at a predetermined position on the outer circumference of the wooden house in order to stretch the brace, The bolt main body includes a retaining means capable of preventing the bolt main body inserted through the mounting hole from being pulled out by an operation from the outside of the wooden house.

  As the retaining means, for example, a retaining member capable of rotating along a surface including the central axis of the bolt main body is pivotally attached, and the retaining member has a center of gravity and a position of the pivoting portion. The upper and lower ends of the bolt body when they are positioned along the central axis direction of the bolt body and projected from the direction of the central axis and fit within the cross-sectional shape of the bolt body, and rotate and stop naturally. Is configured to protrude outward from the cross-sectional shape of the mounting hole on the wooden house side projected from the central axis direction.

  Further, the seismic reinforcement method for wooden houses is a seismic reinforcement method for wooden houses using the brace connecting bolts, and the mounting holes are penetrated from the outside of the wooden house to the beam and the base or foundation of the wooden house. The bolt main body of the brace connecting bolt is inserted into each mounting hole from the outside of the wooden house, and the bolt main body is prevented from being pulled out by a retaining means operated from the same side. Then, the end of the brace is connected to each bolt body, and a nut is screwed to the bolt body to stretch the brace between the beam and the base or foundation.

  In the present invention, a wooden house refers to a house having wooden pillars and beams such as cedar and firewood, and using, for example, mortar, earth wall, tin, siding board, or a combination thereof as an outer wall material.

  In the present invention, there is provided a brace connecting bolt that penetrates a mounting hole from the outside of the wooden house to a beam and a base or foundation in the wooden house, and connects the end of the brace to the mounting hole. The bolt main body is prevented from being pulled out by a retaining means which is inserted from the outside of the house and operated from the same side, so that the brace connecting bolt can be fixed. Therefore, it is possible to construct the struts only from the outside of the wooden house, and there is no need to move the furniture in the room to an unobstructed place, raise the tatami mat or remove the floor and the outer wall once. . In addition, the construction is extremely simple, which can shorten the construction period and reduce the construction cost.

  Hereinafter, the brace connecting bolt and the seismic reinforcement method for a wooden house according to the present invention will be described in detail with reference to the drawings. First, the brace connecting bolt will be described. FIG. 1 is a perspective view of a brace connecting bolt according to the present invention, FIGS. 2A and 2B are front views showing the operation with the same parts omitted, and FIG. 3 is an enlarged cross-sectional view taken along line XX in FIG. FIG. The brace connecting bolt A includes a metal bolt body 1 having a predetermined length. On the base end side of the bolt body 1, a thread groove 2 is formed on the outer peripheral surface thereof. A concave groove 3 is provided at the tip of the bolt body 1 so as to open at the tip and both sides along the central axis. In addition, a through-hole 4 that is positioned substantially at the center of the groove 3 and that is orthogonal to and communicates with the groove 3 is provided at the tip of the bolt body 1.

  Then, in the concave groove 3, as shown in FIG. 3, a retaining member 5 as a long plate-shaped retaining means is pivotally attached by a support shaft 6 inserted through the through hole 4 at a substantially central position. Yes. The retaining member 5 can freely rotate in the groove 3, but is fitted to the outer peripheral surface of the bolt body 1 at the back end of the groove 3 to block a part of the back end of the groove 3. An anti-rotation piece 7 having a circular arc cross section is bonded. Thereby, the rotation operation of the retaining member 5 is restricted within a range of about 90 degrees.

  The retaining member 5 has a substantially rectangular shape, and the lateral width of one end (upper end) is set shorter than the lateral width of the other end (lower end) when viewed from the front as shown in FIG. The retaining member 5 is formed into a front trapezoid. As a result, the center of gravity of the retaining member 5 is shifted downward with respect to the central shaft mounting portion, that is, the support shaft 6 in FIG. That is, one side (side with a wide lateral width) is heavier than the other side (side with a narrow lateral width).

  Therefore, as shown in FIG. 2 (a), in the state where the bolt body 1 is disposed substantially horizontally and the groove 3 is disposed in the substantially vertical direction, and the anti-rotation piece 7 is disposed below the groove 3. The retaining member 5 is heavier than the other, with one end sandwiching the shaft-attached portion as shown by the solid line in FIG. In this state, the retaining member 5 is positioned along the direction of the central axis of the bolt body 1 and is aligned with the bolt body 1 in a substantially straight line. At this time, the retaining member 5 is projected from the direction of the central axis and is accommodated in the cross-sectional shape of the bolt body 1. As a result, the mounting hole 27 can be inserted as described later.

  On the other hand, when the bolt body 1 is rotated 180 degrees in a plane perpendicular to the central axis in the above state, the groove 3 is arranged in the substantially vertical direction as it is, but the rotation prevention piece 7 is now positioned above the groove 3. To do. In this state, since the center of gravity is shifted from the shaft-attached portion, the retaining member 5 is naturally rotated away from the rotation prevention piece 7 and substantially orthogonal to the bolt body 1 as shown by a chain line in FIG. Stop at the position you want. At this time, the upper and lower ends project out from the cross-sectional shape of the mounting hole 27 on the wooden house H side, which will be described later, projected from the central axis direction. Thereby, the brace connecting bolt A inserted into the mounting hole 27 can be prevented from coming off.

  A through hole 8 is formed through the base end of the bolt body 1. A pin 10 for holding the bolt body 1 by hand so that the bolt body 1 does not rotate unnecessarily in a plane orthogonal to the central axis when the bolt body 1 is fastened by the nut 9. Can be inserted. Reference numeral 11 denotes a washer used together with the nut 9.

  The brace connecting bolt A has the above-described configuration. Next, a seismic reinforcement method for a wooden house using the brace connecting bolt A will be described. FIG. 4 is a perspective view of an existing wooden house which has been seismically reinforced, and FIGS. 5 to 10 are cross-sectional views of the main part for explaining the seismic reinforcement method in order. The wooden house H shown in FIG. 4 is a general house, and its structure will be briefly described. That is, this wooden house H has a base 21 placed and fixed on the upper surface of a concrete base 20 constructed on the ground E by bolting along the base 20, and a plurality of pillars 22 on the upper surface of the base 21. And an outer wall 23 such as a wall is constructed between the pillars 22 and 22. Further, beams 24 are placed on the pillars 22, and a roof set 25 is constructed above the beams 24.

  A reinforcing bar 26 with a turnbuckle is stretched between the beam 24 and the foundation 20 or the base 21 in the outer periphery of the wooden house H, and between the beam 24 and the foundation 20 in this embodiment. Established. Therefore, the seismic reinforcement method for wooden houses will be described in order based on FIGS.

  First, as shown in FIG. 5, a mounting hole 27 is provided at a predetermined position on the outer periphery of the wooden house H. These mounting holes 27 are respectively provided in the beam 24 and the concrete base 20. In addition, the mounting hole 27 is provided from the outside of the outer wall 23 at a portion covered by the outer wall 23. FIG. 5 shows a state in which a horizontal mounting hole 27 is provided through the foundation 20.

  Further, at this time, as shown in FIG. 10, a reinforcing hardware 28 made of a metal plate is fixed to the joint portion of each pillar 22 with the base 20 or the base 21 by tightening a screw 29 in order to strengthen the joining force. Yes. The mounting hole 27 is formed in the reinforcing hardware 28 and is substantially matched with a fastening hole 30 having substantially the same inner diameter as the mounting hole 27.

  Therefore, as shown in FIG. 6, a mounting plate portion 26a at the lower end of the brace 26 is attached to one side surface of the reinforcing hardware 28, and the connecting hole 31 formed in the mounting plate portion 26 is tightened with the mounting hole 27. It communicates through the stop hole 30. Then, the retaining member 5 is set to the distal end side, and the bolt main body 1 of the brace connecting bolt A is inserted into the mounting hole 27 through the fastening hole 30 and the connecting hole 31. At this time, the concave groove 3 is arranged in a substantially vertical direction, and the rotation prevention piece 7 is arranged below the concave groove 3, and the retaining member 5 is supported by the rotation prevention piece 7 on its heavy side 5 a. To. Thereby, the retaining member 5 is projected from the central axis direction and is accommodated in the cross-sectional shape of the bolt body 1, and the bolt body 1 can be smoothly inserted into the mounting hole 27 without being supported by the retaining member 5. Further, a washer 11 is fitted in advance to the base end portion of the bolt body 1, a nut 9 is screwed, and a pin 10 is inserted into the through hole 8.

  Next, the bolt body 1 is rotated 180 degrees in a plane orthogonal to the central axis thereof with the tip of the bolt body 1, that is, the retaining member 5 passing through the mounting hole 27. Thereby, although the ditch | groove 3 is arrange | positioned as it is in a substantially perpendicular direction, the rotation prevention piece 7 is located above the ditch | groove 3 this time. In this state, as shown by a solid line in FIG. 7, the retaining member 5 moves away from the rotation preventing piece 7 and naturally rotates, and stops at a position substantially orthogonal to the bolt body 1. At this time, the upper and lower ends of the retaining member 5 protrude outward from the cross-sectional shape of the mounting hole 27 projected from the central axis direction. Therefore, even if the pin 10 is held by hand and the brace connecting bolt A is pulled out from the mounting hole 27 from the outside, the retaining member 5 is supported by the inner opening 27a of the mounting hole 27 and cannot be pulled out. Become.

  Further, the nut 9 is screwed with the pin 10 held. When the nut 9 is completely tightened, the pin 10 is pulled out from the through hole 8. As a result, the lower end portion of the brace 26 is firmly fixed to the foundation 20 as shown in FIGS. Although illustration is omitted, the upper end of the brace 26 is firmly fixed to the beam 24 by performing the same procedure as described above on the beam 24 side. Finally, the turnbuckle 32 at the center of the brace 26 is tightened and the brace 26 is strongly stretched without loosening. In addition, this brace 26 is arranged so as to be hung on the paddle. In this way, as shown in FIG. 10, many braces 26 are stretched on the outer periphery of the wooden house H.

  The length of each bolt body 1 is set according to the thickness dimension because the horizontal thickness of the foundation 20 or the base 21 and the beam 24 is not always constant. After the construction is completed, if the base end portion of the bolt body 1 protrudes from the nut 9, it is not only disturbing but also dangerous.

  FIG. 11 is a perspective view of a brace connecting bolt according to another embodiment. Since this brace connecting bolt A1 is similar in structure to the brace connecting bolt A according to the present invention, the same parts are denoted by the same reference numerals and detailed description thereof is omitted. That is, at the front end portion of the bolt main body 1 in the brace connecting bolt A1, the support piece portion 12 is left in the central portion along the plane including the central axis of the bolt main body 1, and the notches 13 and 13 are formed on both sides thereof. Is provided.

  A retaining member 14 as a retaining means is pivotally attached to the support piece 12 by a support shaft 6. The retaining member 14 is formed in a U-shape by both arm pieces 14a, 14a arranged in parallel, and a shaft hole formed in the arm pieces 14a, 14a arranged on both sides of the support piece 12 The support shaft 6 is inserted through 15 and 15. Further, similarly to the brace connecting bolt A of the present embodiment, each arm piece portion 14a of the retaining member 14 has a substantially rectangular shape when the bolt body 1 is viewed from the front in FIG. The lateral width of the end (upper end) is set shorter than the lateral width of the other end (lower end), and each arm piece 14a is formed into a front trapezoid. Thereby, the position of the center of gravity of the retaining member 14 is shifted downward with respect to the central shaft mounting portion, that is, the support shaft 6. That is, one side (side with a wide lateral width) is heavier than the other side (side with a narrow lateral width).

  Therefore, in the state where the bolt main body 1 is disposed substantially horizontally and the support piece portion 12 is disposed in the substantially vertical direction, and the rotation prevention piece 7 is disposed below the support piece portion 12, the retaining member 14 has a shaft. One across the landing is heavier than the other. Therefore, the heavy side 14b is supported by the rotation preventing piece 7, and the retaining member 14 is positioned along the central axis direction of the bolt body 1 and is arranged in a substantially straight line. At this time, the retaining member 14 is projected from the direction of the central axis and is accommodated in the cross-sectional shape of the bolt body 1.

  Further, when the bolt body 1 is rotated 180 degrees in a plane orthogonal to the central axis in the above state, the support piece 12 is arranged in the substantially vertical direction as it is, but the rotation prevention piece 7 is now replaced with the support piece 12. Located on the upper side. In this state, since the center of gravity is shifted from the shaft attachment portion, the retaining member 14 is naturally rotated away from the rotation preventing piece 7 and stopped at a position substantially orthogonal to the bolt body 1. At this time, the upper and lower ends protrude outward from the cross-sectional shape of the mounting hole 27 projected from the central axis direction. These retaining means are merely examples, and other configurations may be adopted as long as the same purpose can be achieved.

  As described above, according to the present invention, a brace is provided in which a mounting hole 27 is provided through a beam and a base or foundation in a wooden house from the outside of the wooden house, and the end of the brace 26 is connected to the mounting hole 27. The connecting bolts A and A1 are inserted from the outside of the wooden house H, and the bolt main body 1 is prevented from being pulled out by the retaining means 5 and 14 operated from the same side, and the brace connecting bolts A and A1 are fixed. I was able to do it. Therefore, it is possible to construct the brace 26 only by working from the outside of the wooden house H. It is necessary to move the furniture in the room to an unobstructed place, raise the tatami mat, or peel off the floor and the outer wall once. Nor.

  Moreover, since the mounting hole 27 is provided through the outside of the wooden house and the brace connecting bolts A and A1 are inserted into the mounting hole 27, the end of the brace 26 can be connected. It can be done easily, the construction period is short, and the construction cost can be reduced.

The perspective view of the brace connection bolt which concerns on this invention. (A) (B) is a front view showing the operation with the same portion omitted. XX line expanded sectional view of Drawing 2 (b). The perspective view of the existing wooden house reinforced with earthquake resistance. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. Sectional drawing of the principal part which explains an earthquake-proof reinforcement construction method later on. The perspective view of the brace connection bolt concerning other embodiments.

Explanation of symbols

1 Bolt body 5 Retaining means (Retaining member)
6 Support shaft 9 Nut 14 Retaining means (Retaining member)
20 Foundation 21 Base 24 Beam 26 Brace 27 Mounting Hole A Brace Connection Bolt A1 Brace Connection Bolt H Wooden House

Claims (3)

A brace coupling bolt that is inserted from the outside into a mounting hole provided at a predetermined position on the wooden house outdoor circumference in order to stretch the brace,
A brace connecting bolt, wherein the bolt body is provided with a retaining means capable of preventing the bolt body inserted through the mounting hole from being pulled out by an operation from the outside of the wooden house.   The retaining means includes a retaining member that pivots along a surface including the central axis of the bolt body, and the retaining member is displaced from the center of gravity and the position of the pivoting portion. In addition, when positioned along the central axis direction of the bolt body, it projects from the central axis direction and fits within the cross-sectional shape of the bolt body, and when it rotates and stops naturally, its upper and lower ends are 2. The brace connecting bolt according to claim 1, wherein the brace connecting bolt is configured to protrude outward from a cross sectional shape of the mounting hole on the wooden house side projected from the central axis direction.   A seismic reinforcement method for a wooden house using the brace connecting bolt according to claim 1, wherein a mounting hole is penetrated from the outside of the wooden house to a beam and a base or a foundation in the wooden house, The bolt body of the brace connecting bolt is inserted into the hole from the outside of the wooden house, and the bolt body is prevented from being pulled out by a retaining means operated from the same side. Seismic reinforcement of a wooden house characterized in that the end of the brace is connected and a nut is screwed onto the bolt body so that the brace is stretched between the beam and the base or foundation. Construction method.

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