JP4922723B2 - Reinforcement method for wooden building structural materials - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structural reinforcing method to reinforce a flaw such as a split and a crack generated in the direction orthogonal to the material axis or the direction near to its direction, caused in a framework member, particularly, in a bending member such as a beam material and a girder material, in a traditional wooden building such as Buddhist temple and Shinto shrine buildings and a frame work member of a conventional method of a relatively large scale. <P>SOLUTION: A female screw bolt 3 is embedded in the substantially right-angled direction to a material surface in its both right-left positions around a reinforcement requiring place 2 of a wooden building structural material 1. A joining tool 4 manufactured by a shape memory alloy of contracting by heating, is installed by a bolt 5 between the right-left female screw bolts 3 and 3. Afterwards, tensional force is generated by heating the joining tool 4 up to the contraction temperature of the shape memory alloy. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention is applied to the direction of the material axis generated in a frame member in a traditional wooden building such as a temple and shrine building and a relatively large scale conventional framed housing, especially a bending member such as a beam material or a beam material. The present invention belongs to the technical field of a structural reinforcement method for reinforcing a crack such as a crack or a crack generated in a direction orthogonal to or close to the direction perpendicular thereto.

Cracks such as cracks and cracks generated in the above-mentioned wooden building structural materials are caused by drying of the wood, or when a large stress concentration occurs in the notch, and a suddenly large load was applied. There are various causes, but if left unchecked, there is a possibility of threatening the safety of the entire building. Further, in the case of a temple and shrine building visited by tourists, the presence of the cracks and cracks in the visible portion leads to a down image, and it is necessary to structurally reinforce and repair.
For the above-mentioned cracks and cracks that occur in wooden building structural materials, conventional reinforcement methods such as the bolt joining method or drift pin joining method are the design of workability, cost, and appearance. In many cases, it is not appropriate in terms of aesthetics. That is, it takes a lot of work to drill holes for bolts and drift pins, and to process slits for inserting bonded steel plates, and many heads of bolts and drift pins are exposed on the surface of the structural material, which often impairs the appearance.

As another prior art, the frame construction method disclosed in the following Patent Document 1 is a method in which wooden building structural materials and the like are butted against each other and fixedly joined to each other. The bolt hole is passed through, a nut seat that is an orthogonal surface is formed at the end of the bolt hole, the bolt is passed through the abutting surface of the structural material through the bolt hole, and the nut is fastened and joined. Is described.
In the joining method of the wooden building structural material disclosed in Patent Document 2, a horizontal hole is dug in a direction perpendicular to the abutting surface of the structural material, and a vertical groove is formed from the hole along the abutting surface of the structural material. A method is described in which a substantially T-shaped joining jig is mounted along the horizontal hole and the vertical groove, the structural materials are butted together, and an adhesive is injected and filled through the joining jig. Yes.

Reinforcing and joining methods such as wooden building structural materials disclosed in Patent Document 3 below include mounting holes in the structural materials to be joined to each other, and both ends of the reinforcing material in which fiber materials are bundled. There is described a method of inserting into the mounting hole, further injecting an adhesive into the insertion portion and bonding, and joining for reinforcement.
Moreover, the reinforcement method of the wooden building structural material etc. disclosed in the following Patent Document 4 describes a method in which a fiber reinforcement sheet is wound around the surface of the structural material where the reinforcement is required, and further, an adhesive is applied to reinforce. Yes.

Japanese Patent Laid-Open No. 11-256687 (Patent No. 3041271) JP-A-5-331919 (Patent No. 3181375) JP 2000-265678 A (Patent No. 3532441) Japanese Patent Laid-Open No. 10-37483 (Patent No. 3767023)

In the shaft assembly method of Patent Document 1, it is an essential condition that a bolt hole is made to penetrate at a constant inclination angle with respect to the butting surface of the structural material, and a nut seat that becomes an orthogonal surface is formed at the end of the bolt hole. Therefore, when the cross-section of the structural material is large, the bolt hole is necessarily long. In addition, since it is necessary to perform a drilling process so that the core completely coincides with the abutting surface of the structural material at a certain inclination angle, it is difficult to easily carry out the process on site. It is necessary to drill holes in a factory equipped with a highly accurate NC machine. Therefore, if the existing structural material is to be reinforced, it is difficult to implement it on site, such as once it is necessary to dismantle the existing structural material and bring it into the factory.
The joining method disclosed in Patent Document 2 has many construction results in new construction. However, it is basically a technology for butt-joining two structural materials at the time of new construction, and it is a technology that is difficult to apply for reinforcing and repairing cracks and cracks generated in the structural materials.

The reinforcing and joining method disclosed in Patent Document 3 is also basically a joining method of two members. Although it is not impossible to apply it to repair and reinforcement of cracks and cracks that occur in wooden structures, there is anxiety in securing and confirming construction quality because it involves bonding with an adhesive. In general, when an adhesive (resin) is injected and filled into a fiber molded article such as a fiber sheet, many bubbles remain in the fiber and it is difficult to complete the filling. If the adhesive (resin) is not sufficiently and completely filled, the strength performance of the fiber cannot be sufficiently exhibited. Moreover, although it is common with the technique of the said patent document 2, since it uses an adhesive agent, once it carries out adhesion construction, isolation | separation of a structural material and disassembly are difficult, and renewal (renewability) and reuse (reuse). It will be a hindrance. If a crack or a gap between cracks is generated, the treatment is carried out as it is (for example, as it is cracked), and the treatment result is not preferable in appearance, and there is a possibility of causing decay.
Since the reinforcing method disclosed in Patent Document 4 uses an adhesive as in Patent Documents 2 and 3, there is a problem that separation and disassembly of the structural material is impossible once applied. In addition, since the fiber reinforced sheet is wound around the structural material, the fiber reinforced sheet is exposed to the external appearance and damages the external appearance of the structural material. Therefore, this technique is difficult to apply only to invisible parts such as the attic.

The purpose of the present invention is to generate cracks in a direction perpendicular to or near the material axis direction, which occurs in traditional wooden buildings such as temples and shrines and relatively large scale framed houses. It is intended to provide a method for reinforcing a wooden building structure material that is suitable for reinforcing and repairing cracks and repairs, and has excellent workability and cost in the field, and excellent design appearance.
A further object of the present invention is that it can be easily applied on-site at the level of normal carpentry, and can introduce a repairing force that forcibly closes cracks and cracks that have already occurred (scratches), To provide a method for reinforcing a wooden building structural material suitable for renewal and reuse of a structural material, which can be easily separated, dismantled, and replaced after construction.

As a means for solving the above-described problems, a method for reinforcing a wooden building structure material according to the invention described in claim 1 is:
A joint 4 made of a shape memory alloy that embeds female screw bolts 3 at right and left sides of the wooden building structure material 1 around the right and left sides of the wooden building structure material 1 in a direction substantially perpendicular to the material surface and contracts when heated. A bolt 5 is attached between the female screw bolts 3 and 3, and then the joining tool 4 is heated to the contraction temperature of the shape memory alloy to generate a tension force.

  According to a second aspect of the present invention, in the method for reinforcing a wooden building structure material according to the first aspect, among the wooden building structure materials, the female screw bolts 3 are embedded, and the joint 4 made of a shape memory alloy is attached to the left and right sides. A concave surface 6 is formed by carving a material surface in a range necessary for mounting between the female screw bolts 3 and 3 to a certain depth, and the upper end of the female screw bolt 3 and the head of the bolt 5 attached to the female screw bolt 3, and a female After each of the joints 4 attached between the screw bolts 3 and 3 is submerged from the surface of the material, the joints 4 are heated to the contraction temperature of the shape memory alloy to generate tension, and then the opening of the concave concave surface 6 is opened. The surface portion is covered and covered with a wooden board cover 7 of the same material so as to be flush with the original material surface of the wooden building structural material 1.

A method for reinforcing a wooden building structure material according to the invention described in claim 3 is:
Forming a notch 10 for a bolt having a width and a depth capable of installing a reinforcing bolt 8 up to a certain length on both the left and right sides of the reinforcement required portion 2 of the wooden building structure material 1 and a notch for the bolt A nut notch 11 having a width and depth capable of installing a nut 9 and a washer is formed at both ends of the recess 10, and a width capable of using and installing a heating device at the center of the bolt notch 10. A nut 9 is attached to both ends of a reinforcing bolt 8 made of a shape memory alloy that forms a space 12 having a depth and contracts when heated, and is in close contact with the internal spacing of the nut notches 11 and 11 at both ends. Reinforcing bolts 8 in which the positions of the nuts at both ends are adjusted to a length that can be accommodated are installed in the notch 10 for bolts and the notch 11 for nuts, and thereafter, the space 12 is used to reinforce by a heating device. Heating the bolt 8 to shrinkage temperature of the shape memory alloy and wherein the generating the tensioning force.

  According to a fourth aspect of the present invention, in the method for reinforcing a wooden building structure material according to the third aspect, the reinforcing bolt 8 is heated to the shrinkage temperature of the shape memory alloy to generate a tension, and then the bolt notch The opening 10 in the space 12 in which the heater 10 and the nut notch 11 and the heating device can be used / installed is covered with the same material wooden board cover 7 so as to be flush with the original surface of the wooden building structure material. It is characterized by hiding.

  The invention described in claim 5 is the method for reinforcing a wooden building structure material according to claim 3, wherein a plurality of disc springs 15 are stacked inside a nut 9 attached to at least one end of the reinforcing bolt 8. When the tensioning force is generated by heating the reinforcing bolt 8 to the contraction temperature of the shape memory alloy, the amount of displacement of the disc spring 15 is measured and the magnitude of the tensioning force is calculated and confirmed. It is characterized by doing.

The method for reinforcing a wooden building structure material according to the invention described in claim 6 is:
The squirrel 16 made of a shape memory alloy that shrinks when heated is driven in an arrangement straddling the left and right sides of the wooden building structure material 1 centered around the point 2 where reinforcement is required. It is characterized by generating tension by heating to the contraction temperature.

The method for reinforcing a wooden building structure material according to the present invention includes embedding a female screw bolt 3 or forming a concave concave surface 6 and closing the opening surface with a wooden board cover 7 of the same material or forming a bolt notch 10 or the like. However, it includes a step of driving the squirrel 16 and heating it to the contraction temperature of the shape memory alloy to generate a tension force, both of which are work at the level of carpentry and can be easily constructed on site. . In particular, tension force is generated by heating the shape memory alloy, so tightening the nut 9 with a wrench is unnecessary, providing excellent workability, and sufficiently exerting repairing power to close the cracks and cracks occurring at the point 2 where reinforcement is required. Therefore, the appearance of the wooden building structure material 1 can be improved.
Further, as described above, the cross-sectional defect given to the wooden building structure material 1 is such that the female screw bolt 3 is embedded, the bolt notch 10 or the like is formed, the concave concave surface 6 is formed, or the squirrel 16 is driven. In addition, since the generation of scratches is minimized, there is little decrease in strength.

Although the nuts 9 are attached to both ends of the reinforcing bolt 8 as described above, since the nut tightening operation with a wrench is unnecessary, it is not necessary to secure a space for the nut tightening operation, so the nut blowing 11 is minimal. In addition, since the cross-sectional defect is small, more reinforcing bolts 8 can be efficiently installed, which contributes to the improvement of the reinforcing effect.
Moreover, since no adhesive is used, it is possible to remove or replace the elements such as the bolts 8 for reinforcement, the joints 4 and the squirrel 16 as needed after the reinforcement has been applied. Since disassembly of the material 1 is easy, it is convenient for recycling and reuse of the structural material 1.
In addition, as in the inventions according to claims 2 and 4, a wooden construction is performed by covering and covering the opening surface portion of the reinforcing construction portion with the same material wood board cover 7 so as to be flush with the material surface. The appearance design of the structural material 1 is not required to be visually recognized, and it is extremely useful for improving and maintaining the aesthetic appearance.

The joint 4 made of a shape memory alloy is embedded between the left and right female screw bolts 3, 3, embedded in the left and right sides of the wooden building structural material 1 at the left and right positions of the wooden building structure material 1. Attach and heat the connector 4 to the contraction temperature of the shape memory alloy to generate tension.
Alternatively, bolt notches 10 are formed to a certain length on both the left and right sides of the wooden building structure material 1 where reinforcement is required, and nut notches 11 are formed at both ends of the bolt notch 10. Further, a space 12 for a heating device is formed in the central portion of the bolt notch 10. Then, nuts 9 are attached to both ends of a reinforcing bolt 8 made of a shape memory alloy that shrinks when heated, and is installed in the bolt notch 10 and nut notch 11. 8 is heated to the contraction temperature of the shape memory alloy to generate tension.
Alternatively, a casket 16 made of a shape memory alloy that shrinks when heated is driven in an arrangement so as to extend equally over the left and right sides of the wooden building structure material 1 with the reinforcement required portion 2 as the center. Heat to the contraction temperature of to generate tension. The concave surface 6 is formed by carving, and the upper end of the female screw bolt 3, the head of the bolt 5 attached to the female screw bolt 3, and the joint 4 attached between the female screw bolts 3 or 3 or the reinforcing bolt 8 are provided. After sinking from the surface of the material and heating the connector 4 and the reinforcing bolt 8 to generate a tension, the opening surface portion of the carved concave surface 6 is covered with the wooden board cover 7 of the same material and the wooden building structure material 1 Cover and cover with the same material surface.

Below, the Example shown in drawing demonstrates the reinforcement method of the wooden building structural material which concerns on this invention.
First, FIGS. 1A and 1B show Embodiment 1 of the invention according to claim 1, such as beams and girders of a wooden building, particularly cracks generated in a wooden building structural material 1 subjected to bending. A female screw bolt 3 is embedded in a direction substantially perpendicular to the surface of the material, preferably at symmetrical positions on both the left and right sides of the point 2 requiring reinforcement such as a crack. As already known, the female screw bolt 3 has a structure in which a male screw is formed on the outer peripheral surface and a female screw hole 3a is provided at the center. The embedding method is a method of drilling a pilot hole slightly smaller than the outer diameter of the external thread on the outer peripheral surface in advance (for example, about the root diameter of the external thread) with a drill, and screwing the external thread into the lower hole, for example, The female screw bolt 3 is embedded to the extent that the upper end of the female screw bolt 3 is substantially flush with the surface of the wooden building structure material 1.

Next, in the embodiment shown in FIGS. 1A and 1B, a joint 4 made of a shape memory alloy that shrinks when heated and made entirely as a flat plate is used. In the embodiment shown in FIGS. 1C and 1D, only the portion 4a within the heatable range is used. The joint 4 made of shape memory alloy and the other non-heated portion 4b made of plain steel is used, and the joint 4 is attached between the left and right female screw bolts 3 and 3 with bolts 5. 1C and 1D, the shape memory alloy portion 4a and the ordinary steel portion 4b are integrally joined by a screw joint 4c. The bolt 5 is screwed into the female screw hole 3 a formed at the center of the female screw bolt 3. As shown in FIGS. 1A and 1B, the joint 4 made entirely of a shape memory alloy has a total length of, for example, 500 mm, a width of 50 mm, and a plate thickness of about 12 mm. If not made of alloy, the overall length will be a little longer. As shown in FIGS. 1C and D, the shape memory alloy is the only part that shrinks when heated and is effective in generating reaction force on the left and right female threaded bolts 3 and 3 and generating an appropriate tension. The embodiment made of this steel material is more convenient because the heat treatment and the shrinkage length can be easily controlled, and the cost can be reduced. This idea is common to the embodiments described below.
After the above preparation is completed, the joining tool 4 is heated to the shrinkage temperature of the shape memory alloy to generate a tension force, and the tension force causes the cracks and cracks generated in the wooden building structure material 1 to be reinforced. .
Although the illustration of the means for heating the joint 4 is omitted, an electric heater configured as a wrapping belt type is applied to the outer periphery of the joint 4 (part 4a made of a shape memory alloy in the case of FIGS. 1C and 1D). A method of winding and heating by energization can be suitably performed. Alternatively, it is possible to carry out training by laying on the surface of the wooden building structure material 1 in advance and heating with a fire burner.
In addition, although the Example of FIG. 1A, B and the Example of FIG. 1C, D shows the structure which uses the two joining tools 4, it does not restrict to this. 1 or 2 or more, depending on the symptom of the necessary part 2 such as cracks or cracks generated in the wooden building structure material 1 and the width of the wooden building structure material 1 Can be implemented using. This point is common to the embodiments described below.

  As the shape memory alloy constituting the joint 4, a shape memory alloy manufactured under the condition of shape recovery (shrinkage) by 180 ° C. at which thermal decomposition of the wooden building structure material 1 starts is used. Of course, when heat insulation curing can be performed so that heat is not transmitted to the wooden building structure material during the heat treatment, it is not necessary to stick to the temperature setting of 180 ° C. The shape recovery amount (shrinkage amount) of shape memory alloys currently in practical use is limited to about 4% to 5%. Therefore, when the crack or crack size (opening width) generated in the wooden construction material 1 is about 4 to 5 mm and it is desired to realize a contraction amount enough to close the crack, the effective length of the shape memory alloy is calculated by reverse calculation. What is necessary is just to design to about 100 mm, and if it designs more than that, it can block | close a crack and a crack, and can provide a clamping force, and can improve adhesiveness. Moreover, since the cross-sectional defect of the wooden building structure material 1 is limited to the embedded portion of the female screw bolt 3 and is small, there is no problem with respect to the strength reduction of the wooden building structure material 1.

  2A and 2B show a second embodiment of the invention described in the second aspect. The basic structure of the reinforcing method in the second embodiment is the same as the reinforcing method of the wooden building structure material according to the invention of claim 1 shown and described in FIGS. 1C and 1D, but in the case of the second embodiment, The material surface (surface) is constant within the range necessary to embed the female screw bolt 3 in the wooden construction material 1 and attach the flat joint 4 made of shape memory alloy between the left and right female screw bolts 3, 3. The concave surface 6 carved down to a depth of 3 mm is formed, and the upper end of the female screw bolt 3, the head of the bolt 5 attached to the female screw bolt 3, and the joint 4 attached between the female screw bolts 3, 3 are connected to the wooden building structure. It sinks more moderately (about several mm) than the surface (material surface) of the material 1. Then, after the shape memory alloy portion 4a of the connector 4 manufactured as in the embodiment of FIGS. 1C and 1D is heated to its contraction temperature to generate a tension force and the reinforcement processing step is performed, the engraved concave surface A wooden board cover 7 of the same material as that of the wooden building structure material 1 is attached to the opening surface portion 6 so as to be flush with the original surface (material surface) of the wooden building structure material 1, and the concave surface 6 is closed. It features a construction finished to cover up. In other words, the wooden board cover 7 covers not only the upper end of the female screw bolt 3, the head of the bolt 5 attached to the female screw bolt 3, and the joint 4 attached between the female screw bolts 3 and 3 but also most of the necessary portions 2 for reinforcement. Therefore, since the wooden building structure material 1 is in a repaired state (finished state) equivalent to the state in which the wooden building structural material 1 has returned to the state before the occurrence of cracks and cracks, the appearance of the appearance is unprecedented.

Next, FIG. 3A, B has shown the Example of the reinforcement method of the wooden building structural material which concerns on the invention described in Claim 3. FIG. This embodiment is characterized in that the reinforcing bolts 8 and nuts 9 are used, and the cross section of the wooden building structure material 1 is large, and the load and bending stress to be borne are large, so the strength of the reinforcing part is also high. This is an embodiment suitable for the case where is required.
That is, the notch 10 for the bolt having a width and a depth capable of installing the reinforcing bolt 8 is formed to a substantially equal and constant length region on both the left and right sides of the wooden building structure material 1 in the center where the reinforcement is required. . A nut notch 11 having a width and a depth capable of installing the nut 9 and the washer 13 is formed at both ends of the bolt notch 10. In addition, a space 12 having a width and a depth in which a heating device described later can be used or installed is formed in the central portion of the bolt notch 10.
For example, when the outer diameter of the reinforcing bolt 8 is 12 mm and the total length is about 600 mm, the width of the bolt notch 10 is about 14 mm, the depth is about 40 mm, and the width and depth of the nut notch 11. Each of the lengths is about 50 mm, and the width and depth of the space 12 where the heating device is used or installed is also 50 mm, and the length is about 100 mm to 200 mm.

The reinforcing bolt 8 has a configuration in which a bolt portion 8b made of ordinary steel is coupled to both ends of a slightly thicker rod-shaped portion 8a made of a shape memory alloy that shrinks when heated by a screw joint 8c in a concentric arrangement. Nuts 9 and washers 13 are attached to the bolt portions 8b at both ends. The positions of the nuts 9 and 9 are adjusted in advance so that the left and right washers 13 can be fitted into the inner space of the nut notches 11 and 11 at both ends of the bolt notch 10 in advance. Then, the reinforcing bolt 8 is installed in the notch 10 for the bolt and the notches 11 and 11 for the nut.
At that time, although not shown in the drawing as a heating device, a form in which the wound belt type electric heater is fitted in the space 12 to the outer periphery of the portion 8a of the reinforcing bolt 8 made of a shape memory alloy in advance, It is wound around the size and installed in the notch 10 for bolts.
After the reinforcing bolts 8 are thus installed, the heating device is heated by energization to heat the reinforcing bolts 8 to the contraction temperature of the shape memory alloy to generate a tension force, and the necessary reinforcement points 2 are cracked or cracked. Reinforce and repair while closing As another heating method of the reinforcing bolt 8, a method of laying a heat-proof sheet such as an iron plate on the bottom surface of the space 12 and directly heating the reinforcing bolt 8 from above with a burner is used to contract the shape memory alloy. Is possible.
In any case, the reinforcing bolt 8 contracts the shape memory alloy portion 8a to the set value to generate a tension force, so that it is not necessary to tighten the nuts 9 at both ends, and the work is troublesome. Can be greatly omitted. Further, it is sufficient that the nut notch 11 is formed to have a width and depth limited to the extent that the washer 13 and the nut 9 can be accommodated, and the cross-sectional defect of the wooden building structure material 1 can be suppressed to the minimum.

  It should be noted that the notch 10 for the bolt, the notch 11 for the nut, and the upper surface opening of the space 12 are flush with the surface of the wooden building structure material 1 by the wooden board cover 7 of the same material as the wooden building structure material 1. The point of covering and concealing is similar to Example 2 above, and is a device that improves the appearance of the finish of the reinforcement work.

Next, FIGS. 4A and 4B show a fourth embodiment of the present invention. The basic configuration is almost the same as that of the third embodiment. However, if the problems common to Examples 1, 2, and 3 are listed, although the joint memory 4 or the reinforcing bolt 8 is heated to contract the shape memory alloy, how much tension is generated. Thus, it is impossible to visually confirm whether or not the reinforcement required portion 2 has been reinforced and repaired.
Therefore, the fourth embodiment is configured to check or calculate the magnitude of the tension force by visual confirmation and to inspect the effectiveness of reinforcement and repair of the portion 2 requiring reinforcement.
That is, a plurality of sheets are provided by using a spring washer 14 between the washer 13 of the nut 9 and the nut notch 11 at least one end of the reinforcing bolt 8 installed in the bolt notch 10, in the illustrated example, the left end. The disc springs 15 are stacked and set. Then, when the tensioning force is generated by heating the reinforcing bolt 8 to the contraction temperature of the shape memory alloy, the disc spring 15 is compressed in proportion to the magnitude of the tensioning force. When measured, the magnitude of the tension force can be calculated and confirmed and checked almost accurately by the stress calculation formula.

Next, FIGS. 5A and 5B show a fifth embodiment of the present invention.
This method of reinforcing a wooden building structure material is driven by placing a plurality of caskets 16 made of a shape memory alloy that shrinks when heated, in an arrangement that equally straddles the left and right sides of the wooden building structure material 1 with the reinforcement required point 2 as the center. After that, each of the mussels 16 is heated to the contraction temperature of the shape memory alloy by a heating device to generate tension. In the example shown in the figure, three mussels 16 are driven in, but this is not restrictive. Depending on the symptom of the reinforcement required location 2 of the wooden building structure material 1, it can be carried out using one, two or three or more.
In addition to the case where the whole is made of a shape memory alloy, the casket 16 used for this reinforcing method is made of a high-strength steel material only for the portion of the nail to be driven into the wooden construction material 1, and is shown in the middle part of FIG. 5B. The contraction portion supported by K can be manufactured from a shape memory alloy, and both can be integrally joined.
As a method of heating the squirrel 16 to a temperature at which the shape memory alloy contracts, for example, a method of pressing and heating a domestic iron capable of adjusting the temperature can be performed.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the embodiment. In the range which does not deviate from the technical idea and the gist of the present invention, it will be noted that it includes a wide range of design changes and application variations which are usually made by those skilled in the art.

A and B are a plan view and a vertical cross-sectional view showing Example 1 of the present invention. C and D are a plan view and a vertical sectional view showing Example 1 of the present invention. A and B are a plan view and a vertical sectional view showing a second embodiment of the present invention. A and B are a plan view and a vertical sectional view showing Embodiment 3 of the present invention. A and B are a plan view and a vertical sectional view showing Embodiment 4 of the present invention. A and B are a plan view and a vertical sectional view showing Embodiment 4 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wooden building structure material 2 Reinforcement required part 3 Female screw bolt 4 Joint tool 5 Bolt 6 Carved concave surface 7 Wood board cover 8 Reinforcement bolt 10 Notch for bolt 11 Notch for nut 12 Space 9 Nut 15 Disc spring 16 Kasugai

Claims (6)

  A joint made of a shape memory alloy that embeds female screw bolts in the right and left sides of the wooden building structure material at the right and left sides of the material, and shrinks when heated, between the left and right female screw bolts. A method for reinforcing a wooden building structural material, characterized in that the connecting member is attached with a bolt, and then the joint is heated to the contraction temperature of the shape memory alloy to generate tension.   Of the wooden building structural material, female screw bolts are embedded, and a concave surface is formed by carving a material surface in a range necessary for mounting a joint made of shape memory alloy between the left and right female screw bolts to a certain depth. The upper end of the screw bolt, the head of the bolt attached to the female screw bolt, and the joint attached between the female screw bolts are submerged from the surface of the material, and the joint is heated to the contraction temperature of the shape memory alloy to increase the tension. 2. After being generated, the opening surface portion of the concave concave surface is covered with a wooden board cover of the same material so as to be flush with the original material surface of the wooden building structure material, and is covered and covered. To reinforce wooden construction materials.   Forming notches for bolts with a width and depth that can be used to install reinforcing bolts up to a certain length on both the left and right sides of the necessary parts of the wooden building structural material, and both ends of the notches for the bolts Form a notch for the nut with a width and depth at which the nut can be installed in the part, and form a space with a width and depth at which the heating device can be used and installed at the center of the notch for the bolt, Reinforcing bolts with nuts attached to both ends of a reinforcing bolt made of a shape memory alloy that shrinks when heated, and the positions of the nuts at both ends adjusted to a length that fits closely within the internal spacing of the nut notches at both ends. Is inserted into the notch for the bolt and the notch for the nut, and then the space is used to heat the reinforcing bolt to the contraction temperature of the shape memory alloy by using the heating device to generate tension. And wherein the door, the reinforcement method of wooden building construction material.   After the reinforcement bolt is heated to the shrinkage temperature of the shape memory alloy and tension is generated, the notch for the bolt and the notch for the nut, and the opening surface of the space where the heating device can be used and installed can be made of the same material. 4. The method for reinforcing a wooden building structure material according to claim 3, wherein the wooden building structure material is covered with a wooden board cover so as to be flush with the original surface of the wooden building structure material.   When a plurality of disc springs are stacked and set inside a nut attached to at least one end of the reinforcing bolt, and the tension is generated by heating the reinforcing bolt to the contraction temperature of the shape memory alloy, the disc 4. The method for reinforcing a wooden building structure material according to claim 3, wherein the amount of tension in which the spring is compressed is measured to calculate and confirm the magnitude of the tension.   A squirrel made of a shape memory alloy that shrinks when heated is driven in an arrangement that straddles the left and right sides of the wooden building structural material evenly, and then the squirrel is heated to the contraction temperature of the shape memory alloy by a heating device. A method for reinforcing a wooden building structural material, characterized by generating tension.

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