JP2017020211A - Box type hardware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide box type hardware, used when installing a member of a large cross section, and easy in predicting deformation when receiving a load, in a wooden building.SOLUTION: Box type hardware 11 used for connecting adjacent two elements is constituted of the other side plate 13 for contacting with one among these two elements, a rear plate 15 for contacting with the other, a pressure receiving pipe 14 sandwiched between the other side plate 13 and the rear plate 15 and a joining bolt 20 for integrating the other side plate 13 and the rear plate 15. The pressure receiving pipe 14 is arranged in a plurality in the outer edge vicinity, and the joining bolt 20 is also inserted into a female screw 25 of the rear plate 15 via the inside of the pressure receiving pipe 14 from a spot-facing 23 of the other side plate 13. A load separating the other side plate 13 and the rear plate 15 is received only by the joining bolt 20, and the relationship between the load and deformation is easily predicted, and a strength calculation can be smoothly executed in all conditions without using a computer analysis such as a finite element method.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a box-shaped hardware used when installing a member having a large cross section in a wooden building.

  Conventionally, wooden buildings have been spread mainly in small houses, but in recent years, they have become larger due to various technological developments, and wooden structures such as commercial facilities and public facilities are also being advanced. With this increase in scale, the members to be used also have a large cross section, and therefore, various hardware is often used for connecting the members instead of the traditional method of fitting the tenon and the tenon groove. Specific examples thereof are shown in FIGS.

  FIG. 8 shows a case in which a box-shaped hardware is used to connect the column and the beam in an L shape, and it is assumed that the side surface of the column and the end surface of the beam are in contact with each other. Cut out the notch at the location and incorporate the box-shaped hardware here. The box-shaped hardware has a structure in which four steel plates are integrated by welding, and both the pillar and the beam embed a lag screw on the surface in contact with the box-shaped hardware. In addition, four lag screws are arranged on one surface of the box-shaped hardware, and a pilot hole is processed in the member in order to embed the lag screws. When a fixing bolt is inserted from the inside of the box-shaped hardware toward the female screw of the lag screw and tightened, the column and the beam are connected as shown in FIG.

  As with the present invention, examples of hardware used for installing and connecting members include the patent document described below, and in Patent Document 1, a pillar can be fixed to a base without hindering the attachment of a brace or a wall. Column base hardware is disclosed. This column base is made up of a square pipe sandwiched between the base and the column, an anchor bolt protruding from the top surface of the base, a large diameter bolt embedded in the lower end surface of the column, a nut screwed into the anchor bolt, and a large diameter When the anchor bolt is inserted into the square pipe and the nut is tightened, the square pipe is fixed to the base. Furthermore, a pillar is fixed to a square pipe by inserting a mounting bolt into the square pipe, screwing it into a large-diameter bolt and tightening it.

  Next, Patent Document 2 discloses a joint structure that is easy to work on site and can realize a reduction in work period, and that can obtain high rigidity. This joint structure assumes the joining of the side surfaces and end faces of two members and the joining of the end faces of the two members in a wood structure using columns and beams, etc. Process and embed a box-shaped joint box. In addition, each member to be joined is processed with an insertion hole or an embedding hole with the notch as a base point, and all screw bolts are embedded therein. When one end of each screw bolt is inserted into the joint box and a nut is screwed therein, the members are joined to each other via the joint box. By using a joint box, high rigidity can be obtained, and by embedding all screw bolts in the member in advance, the work on site can be reduced and the construction period can be shortened.

Utility Model Registration No. 3077715 Japanese Patent Laid-Open No. 10-140659

  In the box-shaped hardware shown in FIGS. 8 and 9, it is difficult to use a general-purpose square steel pipe as a raw material due to strength problems, and a plurality of steel plates are often integrated by welding. Therefore, although the cost increases, it is easy to manufacture a dedicated product with optimized dimensions according to the construction location. However, the box-shaped hardware integrated by welding also generates bending moments and shear loads when subjected to a tensile load, and computer analysis such as the finite element method is indispensable to accurately predict the deformation. There is a corresponding cost.

  As described above, the box-shaped hardware is often manufactured as a dedicated product, but it is difficult in terms of cost to perform computer analysis each time. Therefore, there is a demand for predicting deformation without using computer analysis by changing the configuration of the box-shaped hardware. If this can be realized, it is possible to reduce the cost, etc. of the dedicated product by suppressing the margin of strength to the minimum necessary.

  The present invention has been developed on the basis of such circumstances, and has an object to provide a box-shaped hardware that is used when installing a member having a large cross section in a wooden building and that can easily predict deformation when subjected to a load.

  The invention according to claim 1 for solving the above-mentioned problem is a box-shaped hardware used for connecting two adjacent elements such as columns and beams, foundation concrete and columns, etc., and is in contact with one of the two elements. A front plate, a rear plate in contact with the other, a pressure receiving tube sandwiched between the front plate and the rear plate, and a coupling bolt that integrates the front plate and the rear plate. And a plurality of the connecting bolts arranged near the outer edges of the front plate and the rear plate, and the connecting bolt is inserted into the rear plate from the front plate through the inside of the pressure receiving pipe, and the head of the connecting bolt is inserted into the front plate. A counterbore for accommodating the coupling bolt, and an inner hole through which the shaft portion of the coupling bolt passes. The rear plate is provided with a female screw to be screwed with the coupling bolt, and the front plate and the rear plate are provided with the pillar. To pass the shaft part of the fixing bolt to be inserted toward the beam Serial The vent hole is provided at a position away from the pressure receiving tube, the tensile load acting between the rear plate and the other party plate is a box-shaped fittings, characterized in that catch in the coupling bolt.

  The present invention is a box-shaped hardware for connecting two elements constituting the skeleton of a wooden building, and is assumed to be used in any place. Specific examples of these two elements include columns and beams, and basic concrete. There are cases where both of the two elements can be members, but only one of them can be a member. In addition, about a member, not only a solid material but a laminated material may be sufficient. The box-shaped hardware according to the present invention is a box shape in which a front plate, a rear plate, and a pressure receiving tube are integrated with a connecting bolt, and is arranged at a boundary between two elements to be connected.

  The front plate and the rear plate are obtained by cutting a steel plate into a predetermined size, and in principle, both have the same outer shape, but may have different shapes depending on the balance with the periphery. The thicknesses of both plates are often different from each other due to the balance with the connecting bolt. The front plate is in surface contact with one of the two elements to be connected, and the other plate is in surface contact with the remaining one. However, the front plate and the rear plate are arranged in parallel at a predetermined interval, and both are in direct contact. Never touch.

  The pressure-receiving tube is sandwiched between the front plate and the rear plate, maintains the distance between them, and plays a role of receiving a compressive load that brings the front plate and the rear plate closer together, and is strong enough to withstand the assumed compressive load To have. Further, only one pressure receiving tube is not disposed between the pair of the front plate and the rear plate, but a plurality of pressure receiving tubes are disposed in the vicinity of the outer edges of the front plate and the rear plate. However, care must be taken so that the pressure receiving pipe does not jump out from the outer edge of the front plate or the rear plate.

  The coupling bolt plays a role of integrating the front plate, the rear plate, and the pressure receiving pipe, and the tip thereof is inserted from the front plate toward the inside of the pressure receiving pipe and screwed to the rear plate. Therefore, an inner hole is provided in the front plate so as to pass the shaft portion of the coupling bolt. The rear plate is provided with a female screw that is screwed with the coupling bolt. Of course, the inner hole and the female screw are provided so as to be aligned concentrically. In addition, in order to embed the head of the connecting bolt in the front plate, a counterbore is provided on one end side of the inner hole.

  When the front plate and the rear plate are integrated with the connecting bolt, if the front end of the connecting bolt protrudes from the rear plate, the rear plate and the member cannot be in surface contact. In order to avoid this, the total length of the coupling bolt is strictly determined so as not to protrude from the rear plate. Further, the head of the coupling bolt is embedded in the counterbore as described above. Therefore, there are no protrusions on the outer surfaces of the front plate and the rear plate (opposite surfaces of the pressure receiving tubes). In addition, the extension of the female screw on the rear plate is important for securing the strength of the box-shaped hardware, and the thickness of the rear plate is determined in consideration of this point.

  The box-shaped hardware needs to be integrated with a contacting member or foundation concrete using some means. Therefore, metal parts, such as a lag screw and a deformed steel bar, are embedded in the member. The front plate and the rear plate are provided with holes for inserting fixing bolts to be screwed with these metal parts. In addition to fixing bolts, male screws extending from metal parts and foundation concrete may be inserted into the holes. In addition, the number and arrangement of the perforations can be freely set, but they are concentric with metal parts to be embedded in the member, and a predetermined distance is secured with the pressure receiving pipe.

  In this way, by using a box-shaped hardware in which the pressure receiving tube is sandwiched between the front plate and the rear plate and integrated with the coupling bolt, the load separating the front plate and the rear plate can be received only by the coupling bolt. When calculating the strength, it is not necessary to consider complex factors such as bending moment and shear load. Therefore, it is easy to predict the relationship between the load and the deformation, and the strength calculation can be easily performed under all conditions. In addition, when a tensile load is applied to the box-shaped metal piece, the elasto-plastic deformation is concentrated on the coupling bolt, so that the other portions need to be increased in strength.

  The invention according to claim 2 is for preventing loosening of the connecting bolt, and an auxiliary plate is arranged outside the front plate to press the head of the connecting bolt. The coupling bolt is also stretched by the load that separates the front plate and the rear plate. However, if this tensile load is excessive, the coupling bolt is plastically deformed, its head is lifted, and the box-shaped hardware is also loosened. The auxiliary plate prevents this loosening, is in close contact with the front plate, always presses the head of the coupling bolt, and regulates its lifting. As a result, even after plastic deformation occurs in the connecting bolt, no loosening occurs, and a reduction in the rigidity of the box-shaped hardware is suppressed.

  As in the invention described in claim 1, by using a box-shaped hardware in which a pressure receiving tube is sandwiched between a front plate and a rear plate and these are integrated with a coupling bolt, a load for separating the front plate and the rear plate is It can be received only by connecting bolts, and it is not necessary to consider complex factors such as bending moment and shear load when calculating strength. Therefore, it is easy to predict the relationship between the load and the deformation, and the strength calculation can be easily performed under all conditions without using a computer analysis such as a finite element method.

  As described above, since the strength calculation can be performed without difficulty, it is easy to suppress a margin of strength even for a dedicated product whose dimensions are optimized according to the application, and cost reduction can be realized. In addition, the present invention cuts a steel plate or steel pipe into a predetermined shape, forms holes, etc., and completes them simply by integrating them with connecting bolts, so that it is easy to manufacture a dedicated product, and no welding process is required, Further cost reduction is realized.

  As in the invention described in claim 2, by arranging an auxiliary plate outside the front plate, even when plastic deformation occurs in the coupling bolt due to an excessive tensile load, the lifting of the head is suppressed, and the box shape The loosening of the hardware can be prevented, and the decrease in the rigidity of the connecting portion can be suppressed. In addition, even after plastic deformation of the coupling bolt, there is a possibility that the coupling bolt can be pressed by the auxiliary plate and its shaft portion can be crushed to restore the same state as before the deformation.

It is a perspective view which shows the example of a shape of the box-shaped metal fitting by this invention, and its usage example. It is a perspective view which shows the state which connected the pillar and beam of FIG. 1 with the box-shaped metal fitting. It is a perspective view which shows the case where an auxiliary | assistant board is integrated in the box-shaped metal fitting of FIG. 1 and FIG. The longitudinal cross-sectional view of FIG. 3 is shown, and only the periphery of the box-shaped metal piece arranged below is drawn before and after the deformation of the coupling bolt. The cutting line is the center line of the pressure receiving tube. It is a perspective view which shows the case where the box-shaped metal fitting by this invention is used for installation of a pillar. It is a perspective view which shows the state which installed the pillar of FIG. 5 to the foundation concrete. It is a perspective view which shows the case where the end surface of a pillar is made to contact the upper and lower surfaces of a beam, and the box-shaped metal fitting is used for the place connected in a cross shape. In the perspective view which shows an example of a prior art, in order to connect a pillar and a beam in L shape, the outline at the time of using a box-shaped metal fitting is drawn. It is a perspective view which shows an example of a prior art, and the state which connected the column and beam of FIG. 8 with the box-shaped metal object is drawn.

  FIG. 1 shows an example of the shape of a box-shaped hardware 11 according to the present invention and an example of its use. In this figure, in order to connect the column 41 and the beam 51 in an L shape, two box-shaped hardwares 11 are incorporated in the upper and lower sides, and the box-shaped hardware 11 includes two pieces called a front plate 13 and a rear plate 15. The pressure receiving tube 14 is sandwiched between steel plates, and these are integrated with a connecting bolt 20. The front plate 13 and the rear plate 15 have the same outer shape, and pressure receiving tubes 14 are arranged at the four corners. The shaft portion of the coupling bolt 20 is inserted into the pressure receiving tube 14. Therefore, in addition to the inner holes 22 into which the shaft portions of the connecting bolts 20 are inserted and the counterbores 23 for accommodating the heads of the connecting bolts 20, the connecting bolts 20 are provided at the four corners of the rear plate 15. A female screw 25 is provided to be screwed together.

  The pressure receiving tubes 14 are arranged at the four corners of the front plate 13 and the rear plate 15, but do not jump out of the front plate 13 or the rear plate 15. The four pressure receiving tubes 14 have the same length, and the front plate 13 and the rear plate 15 are arranged in parallel. Therefore, a compressive load that causes the front plate 13 and the rear plate 15 to approach each other is equally received by the four pressure receiving tubes 14. On the other hand, a tensile load that separates the front plate 13 and the rear plate 15 is received by the four connecting bolts 20.

  Both the column 41 and the beam 51 are made of wood, and the side surface of the column 41 and the end surface of the beam 51 are brought into contact with each other. However, in order to incorporate the two box-shaped hardwares 11 there, 52 is processed. Further, in order to fix the box-shaped hardware 11 to the column 41 or the beam 51, the lag screw 31 is embedded in the side surface of the column 41 and the back surface of the notch 52 of the beam 51. Therefore, both the pillar 41 and the beam 51 have the pilot holes 43 and 53 processed beforehand. The depth of the notch 52 is the same as the size of the box-shaped hardware 11, and the end face of the beam 51 (between the upper and lower notches 52) in addition to the front plate 13 contacts the side surface of the column 41.

  The lag screw 31 is a columnar metal rod, and has a spirally extending ridge 35 formed on the side peripheral surface thereof, and this bites into the inner periphery of the pilot holes 43 and 53, whereby the column 41 and the beam 51 are formed. And integrate. Note that a hexagonal head 36 is provided on one end face of the lag screw 31 so as to hang a tool during embedding, and a female screw 37 is provided at the center thereof. In this figure, four lag screws 31 are made into a group, one group is embedded in the back surface of the notch 52 of the beam 51, and two groups of columns 41 are embedded at positions concentrically with the beam 51 side.

  The box-shaped hardware 11 and the lag screw 31 are integrated via a fixing bolt 27. Since the fixing bolt 27 is inserted from the inside of the box-shaped hardware 11 toward the female screw 37 of the lag screw 31, the front plate 13 and the rear plate 15 are provided with a through hole 17 through which the shaft portion passes. The holes 17 are provided at four locations near the center of the front plate 13 and the rear plate 15 apart from the pressure receiving tube 14. The distance between the front plate 13 and the rear plate 15 is determined in consideration of the insertion work of the fixing bolt 27.

  The box-shaped hardware 11 integrates the front plate 13, the pressure receiving tube 14, and the rear plate 15 at the manufacturing stage. Then, when connecting the column 41 and the beam 51, as shown in FIG. 1, the pilot holes 43 and 53 are previously processed in the column 41 and the beam 51, the lag screw 31 is embedded therein, and then the fixing bolt 27 is attached. In use, the two box-shaped hardwares 11 are attached to the notches 52 of the beam 51. Then, after the column 41 is upright at the site, the beam 51 is lifted, and when the position adjustment of the beam 51 is finished, the fixing bolt 27 is inserted from the inside of the box-shaped hardware 11 toward the lag screw 31 of the column 41, When tightened, the column 41 and the beam 51 are connected via the box-shaped hardware 11.

  FIG. 2 shows a state in which the column 41 and the beam 51 of FIG. The box-shaped hardware 11 enters the cutout 52 processed at the end of the beam 51 and contacts the side surface of the column 41. Also, the lag screw 31 is embedded in both the column 41 and the beam 51 so as to sandwich the box-shaped hardware 11, and the column 41 and the beam 51 are attracted to the box-shaped hardware 11 by fixing bolts 27 screwed into the lug screw 31. . In addition, the depth of the notch 52 is aligned with the size of the box-shaped hardware 11, and in addition to the box-shaped hardware 11, the center of the end surface of the beam 51 (between the upper and lower notches 52) also contacts the side surface of the column 41.

  In FIG. 2, the compressive load acting between the column 41 and the beam 51 is received by the box-shaped hardware 11 and the lag screw 31, and the side surface of the column 41 and the end surface of the beam 51 are not depressed by the load. This compressive load is transmitted through the pressure receiving tube 14. On the other hand, the tensile load acting between the column 41 and the beam 51 is transmitted to the connecting bolt 20 of the box-shaped hardware 11 via the lag screw 31 or the like. The connecting bolt 20 receives all of this tensile load due to the structure of the box-shaped hardware 11. Therefore, the mechanical characteristics at this time can be predicted relatively easily based on the physical property values of the connecting bolt 20.

  FIG. 3 shows a case where the auxiliary plate 19 is incorporated in the box-shaped hardware 11 shown in FIGS. 1 and 2. Also in this figure, as in the previous figures, two box-shaped hardwares 11 are used and the column 41 and the beam 51 are connected in an L shape, but the auxiliary plate is interposed between the front plate 13 and the column 41. 19 is different. The auxiliary plate 19 plays the role of preventing the head of the coupling bolt 20 from being lifted, has the same outer shape as the front plate 13, and passes through the shaft portion of the fixing bolt 27. It is provided. The counterbore 23 of the front plate 13 is adjusted in depth so that the head of the coupling bolt 20 and the surface of the front plate 13 are aligned without any step, and the auxiliary plate 19 and the coupling bolt 20 are in contact with each other without a gap.

  FIG. 4 shows a longitudinal section of FIG. 3, and the cutting line is the center line of the pressure receiving tube 14. For the convenience of drawing, only the periphery of the box-shaped hardware 11 arranged below is drawn. The box-shaped hardware 11 and the auxiliary plate 19 are sandwiched between the column 41 and the beam 51, and the lag screw 31 is embedded in both the column 41 and the beam 51. Or, it is in contact with the rear plate 15. From the inside of the box-shaped hardware 11, fixing bolts 27 are inserted toward the individual lag screws 31.

  The auxiliary plate 19 is sandwiched between the side surface of the column 41 and the front plate 13 of the box-shaped hardware 11. Further, the depth of the counterbore 23 of the front plate 13 is adjusted, and the head of the coupling bolt 20 always contacts the auxiliary plate 19. Therefore, the head of the connecting bolt 20 cannot be lifted, and the connecting bolt 20 can be prevented from loosening. In addition, the tip of the connecting bolt 20 is accommodated in the female screw 25 and does not contact the beam 51.

  4 shows a state in which a tensile load is applied between the column 41 and the beam 51, the shaft portion of the coupling bolt 20 is stretched, and is plastically deformed. Even in this state, the auxiliary plate 19 does not loosen the coupling bolt 20, and a certain degree of rigidity is maintained between the column 41 and the beam 51. Moreover, when the direction of load changes and the pillar 41 and the beam 51 approach, the axial part of the coupling bolt 20 will be crushed and it can also be anticipated that the state before the deformation will be restored. The reinforcing plate 19 secures a certain degree of strength (thickness) in consideration of crushing the shaft portion of the coupling bolt 20. In addition, the connecting bolt 20 is more flexible than the fixing bolt 27, the front plate 13, and the rear plate 15, and is deformed with priority.

  FIG. 5 shows a case where the box-shaped hardware 11 according to the present invention is used for installing the pillar 42. The box-shaped hardware 11 in this figure functions as a column base metal that connects the foundation concrete 62 and the column 42, and the two plate-shaped hardwares 11 are used and the rear plate 15 is placed on the upper surface of the foundation concrete 62. Furthermore, when the anchor bolt 63 protruding from the foundation concrete 62 is inserted into the hole 17 of the rear plate 15 and the fixing nut 67 is screwed to the tip of the anchor bolt 63 and tightened, the box-shaped hardware 11 is fixed to the foundation concrete 62. In addition, the lug screw 31 is embedded in the lower surface of the column 42 and the fixing bolt 27 is screwed into the lug screw 31, thereby fixing the column 42 to the box-shaped hardware 11. In FIG. 5, the lag screw 31 is embedded in the column 42. However, as an alternative to the lag screw 31, a steel bar may be embedded in the prepared hole 43 and fixed by adhesion.

  FIG. 6 shows a state in which the pillar 42 of FIG. The downward load acting on the column 42 is transmitted to the foundation concrete 62 via the pressure receiving pipe 14, but the upward load suddenly acting due to an earthquake or the like is received by the coupling bolt 20 at one hand. The bottom surface of the column 42 in this figure is a simple flat surface, but depending on the size of the column 42, a notch 52 is provided as in the beam 51 in FIG. 1, and the box-shaped hardware 11 may be disposed there. .

  FIG. 7 shows a case in which the end face of the column 41 is brought into contact with the upper and lower surfaces of the beam 51, and the box-shaped hardware 11 is used at a place to be connected in a cross shape. Here, two box-shaped hardwares 11 are arranged on the upper and lower surfaces of the beam 51, but the posture is inverted vertically, and the rear plate 15 is in contact with the beam 51 in both cases. Moreover, in order to attach the box-shaped metal object 11 to the beam 51, the hollow lag screw 32 is embedded so that the upper and lower surfaces may penetrate. The hollow lag screw 32 is literally hollow, and the entire screw bolt 33 is inserted into the center thereof. In addition, the full length of the hollow lag screw 32 is equal to the height of the beam 51, and the upper and lower ends of the hollow lag screw 32 are in contact with the box-shaped hardware 11, and transmit the compressive load.

  After the hollow lag screw 32 is embedded in the beam 51 and the entire screw bolt 33 is inserted therein, the box-shaped hardware 11 is vertically arranged, and the end of the entire screw bolt 33 is inserted into the rear plate 15, and a fixing nut 67 is inserted therein. Are screwed together so that the box-shaped hardware 11 is brought into close contact with the beam 51. Further, in order to attach the column 41 to the box-shaped hardware 11, the lag screw 31 is embedded in the end surface of the column 41 and the fixing bolt 27 is inserted from the front plate 13 toward the lag screw 31 in the same manner as in the previous drawings. In addition, since all the screw bolts 33 are necessarily lengthened, it is easy to produce elastic-plastic deformation with respect to a tensile load.

  The box-shaped hardware 11 according to the present invention can be used in various places in a wooden building, and each of the drawings so far shows only specific examples. Also, the auxiliary plate 19 shown in FIG. 3 can be used in various places. Further, the shape of the front plate 13 and the rear plate 15 and the number and arrangement of the pressure receiving tubes 14 may be determined freely. However, the load that separates the front plate 13 and the rear plate 15 is received by the connecting bolt 20.

DESCRIPTION OF SYMBOLS 11 Box-shaped metal object 13 Front plate 14 Pressure receiving pipe 15 Back plate 17 Extraction hole 19 Auxiliary plate 20 Coupling bolt 22 Medium hole 23 Counterbore 25 Female thread (rear plate)
27 fixing bolt 29 communication hole 31 lag screw 32 hollow lag screw 33 full screw bolt 35 ridge 36 head 37 female screw (lag screw)
41 pillar 42 pillar 43 pilot hole (pillar side)
51 Beam 52 Notch 53 Pilot hole (beam side)
62 Foundation concrete 63 Anchor bolt 67 Fixing nut

Claims (2)

Box-shaped hardware used for connecting two adjacent elements such as pillar (41) and beam (51), foundation concrete (62) and pillar (42),
A front plate (13) in contact with one of the two elements, a rear plate (15) in contact with the other, and a pressure receiving tube (14) sandwiched between the front plate (13) and the rear plate (15). And a connecting bolt (20) for integrating the front plate (13) and the rear plate (15),
A plurality of the pressure receiving pipes (14) are arranged in the vicinity of the outer edges of the front plate (13) and the rear plate (15),
The coupling bolt (20) is inserted into the rear plate (15) from the front plate (13) through the inside of the pressure receiving pipe (14),
The front plate (13) is provided with a counterbore (23) for accommodating the head of the coupling bolt (20), and an inner hole (22) through which a shaft portion of the coupling bolt (20) passes.
The rear plate (15) is provided with a female screw (25) to be screwed with the coupling bolt (20),
In order to pass the shaft portion of the fixing bolt (27) inserted toward the pillar (41 or 42) or the beam (51) through the front plate (13) and the rear plate (15), the pressure receiving pipe (14 A hole (17) is provided at a position away from
A box-shaped hardware characterized in that a tensile load acting between the front plate (13) and the rear plate (15) is received by the coupling bolt (20).   The box-shaped hardware according to claim 1, wherein an auxiliary plate (19) is disposed outside the front plate (13) in order to press the head of the coupling bolt (20).

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