Building frame and construction method thereof

Abstract

To enable efficient and easy joining between a web and an end between steel beams to be joined in a building frame.SOLUTION: In a building frame 10 in which beams 30 and 40, positioned on opposite sides across a beam 20, are fixed to the beam 20 in a state of intersection with the beam 20, joint plates 32 and 42 are attached to respective ends 31 and 41 of the beams 30 and 40 and fastened together with a bolt 50 across a web 21 of the beam 20. Among the joint plates 32 and 42 of the beams 30 and 40, the joint plate 32 of the beam 30 has a bolt hole 33 communicating with a web-side bolt hole 23, and the joint plate 42 of the beam 40 has a notched hole 43 communicating with the web-side bolt hole 23. The bolt 50 is inserted through the bolt hole 33, the web-side bolt hole 23, and the notched hole 43, and a tip portion 51 thereof protrudes from the notched hole 43.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a skeleton and a skeleton construction method, and more particularly to a technique for efficiently and easily joining webs and ends between steel beams to be joined in a skeleton. [Background technology]

[0002] In steel-framed buildings, various sizes of steel beams are assembled depending on the scale and structure of the building frame. In this case, the end of one steel beam is joined to the side of another steel beam, or the ends of two steel beams are joined together. Regarding the technique of joining one end to the side of another, a method of fastening the web of the main beam to the plate at the end of the sub-beam with bolts has been proposed. For example, one such technique has been proposed (see Patent Document 1) to prevent twisting in the beams, improve the strength of the beam joints, and prevent unevenness that may occur at the beam joints.

[0003] Specifically, this technology is a skeleton for a steel-framed house in which the end of a beam made of H-shaped steel is joined perpendicularly to a beam to be joined, also made of H-shaped steel, and includes a joining member that joins the web of the beam to the web of the beam to be joined and also joins the underside of the upper flange of the beam to the underside of the upper flange of the beam to be joined, the beam to be joined includes at least one of one beam to be joined that has the same flange thickness and beam configuration as the beam to be joined, and another beam to be joined that has a thinner flange thickness than the beam to be joined and the same beam configuration, the joining member includes a web joining portion that joins the webs of the beam to be joined and an upper flange joining portion that joins the undersides of the upper flanges of the beam to be joined, the upper flange joining portion having a beam upper flange joining piece that faces the underside of the upper flange of the beam to be joined, and a beam upper flange joining piece that is formed by extending the beam upper flange joining piece in the direction of the beam to be joined and faces the underside of the upper flange of the beam to be joined, The structure is characterized in that, when the beam to be joined is one of the beams, the lower surface of the upper flange of the beam to be joined and the upper surface of the upper flange joining piece of the joining member are in contact with each other, and when the beam to be joined is the other beam to be joined, the lower surface of the upper flange of the beam to be joined and the upper surface of the upper flange joining piece of the joining member are joined with a spacer interposed between them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-207527 Summary of the Invention [Problem to be solved by the invention]

[0005] When plates are welded to the ends of sub-girders and bolted to the webs of the main girder on both sides of the axis of the sub-girder, as in the prior art, the following problem remains. For example, when bolting the plates of each sub-girder together across the web of the main girder, the bolting must be performed after both sub-girders are installed. This situation means that even if the plate of one sub-girder is abutted against the web of the main girder and temporarily fastened with bolts to prevent it from falling, the plate of the other sub-girder cannot be bolted to the opposite side of the web unless the temporarily fastened bolts are temporarily removed.

[0006] Furthermore, if an L-shaped plate is used, the bolt connection is made only on one side of the axis of the sub-beam, which can cause the sub-beam to twist due to floor load. Therefore, to prevent the sub-beam from twisting, or rotating, the flange of the sub-beam must also be bolted to the web of the main girder, which can increase the effort and cost.

[0007] In any case, joining steel beams together tends to be time-consuming and costly, and there is room for improvement in the efficiency and cost-effectiveness of the overall framework construction. The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a technology that makes it easy and efficient to join the webs and ends of steel beams to be joined in the framework. [Means for solving the problem]

[0008] The above problem is solved by the structure of the present invention, in which a second beam and a third beam, located on opposite sides of a first beam, are fixed to the first beam in a state where they intersect with the first beam, and the connecting plates of the second beam and the third beam are attached to each end of the second beam and the third beam and are fastened together with a common bolt across the web of the first beam, the connecting plate of the second beam has a second beam side bolt hole that communicates with the web side bolt hole formed in the web, and the connecting plate of the third beam has a notch hole that communicates with the web side bolt hole and is formed to the outer edge of the connecting plate of the third beam, and the common bolt is inserted through the second beam side bolt hole, the web side bolt hole, and the notch hole, and its tip protrudes from the notch hole.

[0009] According to the skeleton of the present invention configured as described above, the joining of the webs and ends between the steel beams to be joined in the skeleton can be performed efficiently and easily.

[0010] Furthermore, in the above-mentioned body, it is preferable that the cutout hole is formed along the width direction of the joining plate of the third beam, and the joining plate of the third beam is joined to the web of the first beam in a state where the width direction of the joining plate of the third beam coincides with the longitudinal direction of the web.

[0011] With this configuration, by sliding the connecting plate of the third beam in the width direction relative to the web end face of the first beam, it is possible to establish communication between the web-side bolt holes of the web and the notched holes of the third beam, which in turn makes it easier and more efficient to join the web and end of the steel beams to be joined in the skeleton.

[0012] Furthermore, in the above-mentioned structure, it is preferable that the connecting plate of the third beam has a third beam side bolt hole arranged at a position different from the cutout hole in the width direction of the connecting plate of the third beam, the web has a web side first bolt hole which is the web side bolt hole communicating with the cutout hole, and a web side second bolt hole communicating with the third beam side bolt hole, and the connecting plate of the second beam has the second beam side bolt hole communicating with the web side first bolt hole and a second beam side cutout hole communicating with the web side second bolt hole.

[0013] With the above configuration, the bolt holes and notch holes of the connecting plates of the second and third beams are staggered at opposing positions (sandwiched between the web of the first beam), making it easier to continuously fasten the second and third beams together with the first beam. This in turn makes it easier and more efficient to join the webs and ends of the steel beams to be joined in the skeleton.

[0014] Furthermore, in the above-mentioned body, it is preferable that the common bolt includes a first bolt and a second bolt, the first bolt being inserted through the second beam side bolt hole, the web side first bolt hole, and the notch hole, and the second bolt being inserted through the second beam side notch hole, the web side second bolt hole, and the third beam side bolt hole.

[0015] The above configuration makes it possible to efficiently construct a structure in which bolts are inserted into each combination of bolt holes and notched holes between the connecting plates of the second and third beam ends, thereby making it possible to more efficiently and easily join the webs and ends of the steel beams to be joined in the skeleton.

[0016] Furthermore, in the above-mentioned body, it is preferable that a first nut is fixed to one end face of the web of the first beam in accordance with the first bolt hole on the web side, and the first nut fits into the cutout hole of the third beam, and that a second nut is fixed to the other end face of the web of the first beam in accordance with the second bolt hole on the web side, and the second nut fits into the cutout hole on the second beam side.

[0017] The above configuration makes it easy and time-saving to temporarily fasten the connecting plates of the second and third beams to the web of the first beam, which in turn makes it possible to more efficiently and easily join the webs and ends of the steel beams to be joined in the skeleton.

[0018] The above-mentioned problem is solved by a skeleton construction method of the present invention, which is a method for constructing a skeleton in which second and third beams located on opposite sides of a first beam are fixed to the first beam in a state where they intersect with the first beam, and includes a step of opposing the joining plate of the second beam to an end face of the web so that second beam-side bolt holes provided in the joining plate of the second beam communicate with web-side first bolt holes formed in the web, in order to fasten the joining plates attached to each end of the second and third beams together with a common bolt across the web of the first beam, and a step of opposing the joining plate of the second beam to an end face of the web so that second beam-side bolt holes provided in the joining plate of the second beam communicate with web-side first bolt holes formed in the web, The problem is solved by the steps of: inserting the common bolt into the first bolt hole on the web side and the second beam side bolt hole; positioning the third beam joining plate so that a notch hole formed in the third beam joining plate to the outer edge fits into the tip of the bolt that protrudes from the web side first bolt hole onto the web end surface by the insertion; and fitting and tightening a nut onto the tip of the bolt that fits into the notch hole and protrudes from the opening of the notch hole by the positioning, thereby co-fastening the second beam joining plate, the web of the first beam, and the third beam joining plate.

[0019] According to the above configuration, the joining of the webs and ends between the steel beams to be joined in the skeleton can be performed efficiently and easily.

[0020] Furthermore, in the above-mentioned body construction method, in accordance with the co-tightening, the bolt and the nut are engaged at the second beam side bolt hole, the web side first bolt hole, and the notch hole, and in response to this, a third beam side bolt hole in the third beam joint plate, which is positioned at a different position from the notch hole in the width direction of the third beam joint plate, a web side second bolt hole in the web that communicates with the third beam side bolt hole, and a second beam side notch hole in the second beam joint plate that communicates with the web side second bolt hole are connected, and it is preferable if the method further includes a step of performing second co-tightening by inserting a second bolt into the second beam side notch hole, the web side second bolt hole, and the third beam side bolt hole, and fitting a second nut onto the tip of the second bolt and tightening it.

[0021] With the above configuration, the bolt holes and notch holes of the connecting plates of the second and third beams are alternated at opposing positions (sandwiched between the web of the first beam), making it easier to continuously fasten the second and third beams together with the first beam. As a result, it is possible to more efficiently and easily join the webs and ends of the steel beams to be joined in the skeleton.

[0022] Furthermore, it is preferable that the above-mentioned body construction method further includes a first fitting process of fitting the cutout hole of the third beam into a first fixing nut fixed to one end face of the web of the first beam in accordance with the first bolt hole on the web side, from the width direction of the third beam; a second fitting process of fitting the second beam cutout hole into a second fixing nut fixed to the other end face of the web of the first beam in accordance with the second bolt hole on the web side, from the width direction of the second beam; a first co-tightening process of performing a first co-tightening with a second bolt to the second fixing nut, the web side second bolt hole, and the third beam side bolt hole, which are connected through the first fitting process; and a second co-tightening process of performing a second co-tightening with a first bolt to the first fixing nut, the web side first bolt hole, and the second beam side bolt hole, which are connected through the second fitting process.

[0023] With the above configuration, the work of fastening the web of the first beam to the second beam and the third beam together becomes continuous and simple, which in turn makes it possible to more efficiently and easily join the webs and ends of the steel beams to be joined in the skeleton. [Effects of the Invention]

[0024] According to the skeleton and skeleton construction method of the present invention, the joining of the webs and ends between the steel beams to be joined in the skeleton can be made more efficient and easier. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view showing an example (part 1) of a joint between a main beam and a sub-beam that constitute the skeleton of this embodiment. [Figure 2] FIG. 2 is a side cross-sectional view showing an example (part 1) of a joint between a main beam and a secondary beam that constitute the skeleton of this embodiment. [Figure 3] FIG. 1 is a perspective view showing an example (part 1) of a joint between a main beam and a sub-beam that constitute the skeleton of this embodiment. [Figure 4] FIG. 2 is a flowchart showing an example of the procedure of a skeleton construction method according to the present embodiment. [Figure 5] FIG. 10 is a perspective view showing a second example of a joint between a main beam and a secondary beam that constitute the skeleton of this embodiment. [Figure 6] FIG. 10 is a plan view showing a second example of the joint between the main beam and the secondary beam that constitute the skeleton of this embodiment. [Figure 7] FIG. 10 is an enlarged plan view showing a second example of the joint between the main beam and the secondary beam that constitute the skeleton of the present embodiment. [Figure 8] FIG. 10 is a flowchart showing an example of the procedure of a skeleton construction method according to another embodiment. [Figure 9] 10A and 10B are a side view and a cross-sectional view showing an example of the joint between a main beam and a secondary beam that constitute the skeleton of another embodiment. [Figure 10] FIG. 10 is a plan view showing an example of a joint between a main beam and a secondary beam that constitute a skeleton of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] <<Preliminary process>> The following describes the skeleton 10 and its construction method of the present invention by taking one embodiment of the present invention (hereinafter referred to as the present embodiment) as an example and referring to the accompanying drawings. However, the embodiment described below is merely an example given to facilitate understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified or improved from the embodiment described below without departing from the spirit of the present invention. Furthermore, it goes without saying that the present invention includes equivalents thereof.

[0027] Next, an example of a beam joint structure that constitutes the skeleton 10 of this embodiment will be described. Fig. 1 is a perspective view showing a joint example (part 1) between a main girder 20 and a secondary beam 30 that constitutes the skeleton 10 of this embodiment. Here, for example, a form is illustrated in which a secondary beam 30 is joined to a web 21 of a main girder 20 that is arranged near the periphery of a building by a T-shaped plate 34 provided at an end 33 of the web 21. In this case, the T-shaped plate 34 is joined to an end face 22A of the web 21 of the main girder 20, while no such joining is performed on the opposite end face 22B.

[0028] The main girder 20 is an H-shaped steel beam composed of a web 21 and a flange 24, and the web 21 has four web-side bolt holes 23. The arrangement of these four web-side bolt holes 23 matches the arrangement of the second-beam-side bolt holes 35 in the T-shaped plate 34 of the secondary beam 30. In other words, when the two are placed opposite each other, the opposing holes are in communication with each other. On the other hand, the secondary beam 30 is an H-shaped steel beam composed of a web 31 and a flange 32, and a T-shaped plate 34 is fixed to each end 33 of the secondary beam 30 by appropriate means such as welding or bolting. In other words, the secondary beam 30 is structured so that it is provided with a T-shaped plate 34 at both ends.

[0029] The T-plate 34 has a T-shaped cross section, and its web portion 38A is fixed to the web 31 of the sub-girder 30. Meanwhile, the flange portion 38B has two bolt holes (hereinafter referred to as second-beam-side bolt holes 35) in one region on either side of the central web portion 38A, and two notched holes (hereinafter referred to as second-beam-side notched holes 37) in the other region. As shown in FIG. 1 , the second-beam-side notched holes 37 are formed from the outer edge 36 toward the inner depth of the flange portion 38B along the width direction of the T-plate 34 of the sub-girder 30. Note that in the illustrated configuration, the second-beam-side notched holes 37 may serve as second-beam-side bolt holes 35 in the T-plate 34 on the side facing the web 21 of the main girder 20.

[0030] Fig. 2 is a side cross-sectional view showing a first example of a joint between the girder 20 and the sub-girder 30 that constitute the skeleton 10 of this embodiment, and Fig. 3 is a perspective view showing a first example of a joint between the girder 20 and the sub-girder 30 that constitute the skeleton 10 of this embodiment. As shown in Figs. 2 and 3, the T-shaped plate 34 of the sub-girder 30 is brought into contact with the web 21 of the girder 20 having the above-described configuration in a facing orientation. Then, the four web-side bolt holes 23 in the web 21 are brought into communication with the two second-beam-side bolt holes 35 and the two second-beam-side cutout holes 37 in the T-shaped plate 34.

[0031] After this communication state is formed, bolts 50 are inserted into the web-side bolt holes 23 from the end face 22B side of the web 21 of the main girder 20. Next, nuts 60 are set on the bolt tips that protrude from the surface of the flange portion 38B of the T-plate 34 as a result of this insertion, and a tightening operation is performed. With this tightening operation, the web 21 of the main girder 20 and one of the T-plates 34 of the secondary girder 30 are bolted together.

[0032] <<Framework Construction Method in This Embodiment>> The skeleton construction method of this embodiment will be described below with reference to Fig. 4 and Fig. 5 to Fig. 7. Fig. 4 is a flow chart showing an example of the procedure of the skeleton construction method of this embodiment. Fig. 5 is a perspective view showing an example (part 2) of the joints between the girders 20, 20A and the girders 30, 40 that constitute the skeleton 10 of this embodiment, Fig. 6 is a plan view showing an example (part 2) of the joints between the girders 20, 20A, 20B and the girders 30, 40 that constitute the skeleton 10 of this embodiment, and Fig. 7 is an enlarged plan view showing an example (part 2) of the joints between the girders 20A and the girders 30, 40 that constitute the skeleton 10 of this embodiment.

[0033] As explained in the "preliminary process" above, the T-plate 34 provided at one end 33B of the sub-beam 30 has already been fixed by bolts to the web 21 of the main girder 20. The T-plate 34A provided at the other end 33A of the sub-beam 30 faces the web 21 of another main girder 20A that is arranged parallel to the main girder 20. In other words, the T-plate 34A provided at the other end 33A of the sub-beam 30 will be joined to the web 21 of this other main girder 20.

[0034] First, the T-shaped plate 34A of the secondary beam 30 is positioned opposite the end face 22B of the web 21 so that the second beam side bolt hole 35 (see Figures 6 and 7) provided in the T-shaped plate 34A at the other end 33A of the secondary beam 30 is connected to the first web side bolt hole 23A formed in the web 21 of the main beam 20 (S1).

[0035] Next, the first bolt 51 is inserted (S2) through the web-side first bolt hole 23A and the second beam-side bolt hole 35, which are positioned to communicate with each other due to the opposing (S1). At this time, the tip 52 of the first bolt 51 penetrates the flange portion 38B of the T-plate 34A and the web 21 of the girder 20, and protrudes from the end face 22A of the web 21 (FIG. 7: first stage). In addition, a first nut 61 is fitted onto the tip 52 of the first bolt 51 to perform bolt tightening. However, this bolt tightening is not performed until the first nut 61 abuts against the end face 22A of the web 21. The bolt tightening is stopped midway so as to leave at least a gap V (e.g., an internal height equivalent to the plate thickness of the flange portion 38B plus a predetermined thickness) capable of receiving the flange portion 38B of the T-plate 34.

[0036] Next, by the above insertion (S2), the T-shaped plate 44A of the sub-beam 40 is positioned (S3) so that the third beam side cutout hole 45 formed in the T-shaped plate 44A of the sub-beam 40 fits into the width direction X (see Figures 5 and 6) of the T-shaped plate 44A toward the gap V (see Figure 7: second stage) between the tip 52 of the first bolt 51 protruding from the first bolt hole 23A on the web side onto the end face 22A of the web 21 and the end face 22A of the web 21.

[0037] As shown in Figures 5 and 6, the sub-beam 40 is a beam arranged between the girder 20A and the main girder 20B, which is arranged parallel to the main girder 20A. By joining the sub-beam 30 and the sub-beam 40 to the main girder 20A, the main frame 10 is constructed in which the sub-beam 30 (second beam) and the sub-beam 40 (third beam), which are located on opposite sides of the main girder 20A, are fixed to the main girder 20A in a state where they intersect with the main girder 20A. The third-beam-side cutout hole 45 in the sub-beam 40 is formed along the width direction of the T-shaped plate 44 of the sub-beam 40. The T-shaped plate 44 of the sub-beam 40 is joined to the end face 22A of the web 21 of the main girder 20 with its width direction coinciding with the longitudinal direction of the web 21.

[0038] With the above arrangement (S3), the T-shaped plate 34A of the sub-beam 30, the web 21 of the main girder 20, and the T-shaped plate 44A of the sub-beam 40 are stacked in the gap V between the tip 52 of the first bolt 51 protruding from the opening of the third beam side cutout hole 45 and the first nut 61 by fitting into the third beam side cutout hole 45 of the sub-beam 40. Then, by tightening the bolts using the first bolt 51 and the first nut 61, they are tightened together (S4).

[0039] By carrying out the steps up to S4 above, the third beam-side bolt hole 47 in the T-plate 44A of the secondary beam 40, the second web-side bolt hole 23B in the web 21 of the main beam 20A, and the second beam-side cutout hole 37 in the T-plate 34A of the secondary beam 30 are connected to each other (S5), as shown in the second and third stages of Fig. 7. The third beam-side bolt hole 47 is a bolt hole that is located at a different position from the second beam-side cutout hole 37 of the secondary beam 30 in the width direction of the T-plate 44A.

[0040] Therefore, second bolts 55 are inserted through the second beam-side cutout holes 37, the web-side second bolt holes 23B, and the third beam-side bolt holes 47, and second nuts 62 are fitted onto the tips 56 of the second bolts 55 and tightened, thereby performing second co-fastening (S6). In this way, the skeleton 10 is constructed, in which the secondary beam 30 is joined between the parallel girders 20 and 20A, and the secondary beam 40 is joined between the girders 20A and 20B.

[0041] <Framework construction method in other embodiments> Next, an example of the procedure for a skeleton construction method in another embodiment will be described. Fig. 8 is a flow chart showing an example of the procedure for a skeleton construction method in another embodiment, Fig. 9 is a side view and a cross-sectional view showing an example of joining the girder 20 and the sub-girders 30, 40 that constitute the skeleton 10 of another embodiment, and Fig. 10 is a plan view showing an example of joining the girder 20 and the sub-girders 30, 40 that constitute the skeleton 10 of another embodiment. Here, a form is shown in which fixing nuts are attached to the web 21 of the girder 20 in advance (initial stage in Figs. 9 and 10), the sub-girders 30, 40 are temporarily fastened to the web 21 of the girder 20 using these fixing nuts as fulcrums (first stage in Figs. 9 and 10), and then a co-tightening process (second stage in Figs. 9 and 10) is performed.

[0042] In this flow, first, the second fixing nut 63B, which is fixed to the end surface 22B of the web 21 of the main girder 20 in alignment with the second web-side bolt hole 23B of the web-side bolt holes 23, is fitted into the second beam-side cutout hole 37 in the T-shaped plate 34 of the secondary beam 30 so as to be aligned with the end surface 22B of the web 21 from the width direction of the secondary beam 30 (S10). The state after this fitting is the first stage in Figures 9 and 10.

[0043] The first bolt 51 is inserted into the first fixing nut 63A, the first bolt hole 23A on the web side, and the second beam side bolt hole 35, which have become connected to each other through the above step (S10), and the first bolt 51 is fitted into the first fixing nut 63A and tightened, thereby performing the first co-tightening (S11).

[0044] Next, the first fixing nut 63A, which is fixed to the end surface 22A of the web 21 of the main girder 20 in alignment with the first web-side bolt hole 23A among the web-side bolt holes 23, is fitted into the third beam-side cutout hole 45 in the T-shaped plate 44 of the secondary beam 40 so as to be aligned with the end surface 22A of the web 21 from the width direction of the secondary beam 40 (S12). The state after this fitting is the second stage in Figures 9 and 10.

[0045] In addition, a second bolt 55 is inserted into the second fixing nut 63B, the second beam side cutout hole 37, the web side second bolt hole 23B, and the third beam side bolt hole 47, which have become connected to each other through the above step (S12), and the second bolt 55 is fitted into the second fixing nut 63B and tightened, thereby performing a second co-tightening (S13).

[0046] This results in a structure in which the second fixing nut 63B fixed to the end face 22B of the web 21 of the main girder 20 in accordance with the second bolt hole 23B on the web side is fitted into the second beam side cutout hole 37 of the secondary beam 30, and in which the first fixing nut 63A fixed to the end face 22A of the web 21 of the main girder 20 in accordance with the first bolt hole 23A on the web side is fitted into the third beam side cutout hole 45 of the secondary beam 40, resulting in a structure in which the above-mentioned first and second co-tightenings are achieved.

[0047] Thereafter, by repeating the steps S10 to S13 as necessary, the joint structure between the main beam 20 and the secondary beams 30, 40 is appropriately formed according to the design contents of the building, etc., and the main body 10 is constructed.

[0048] Although one embodiment of the skeleton 10 and skeleton construction method of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit of the present invention. Furthermore, the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0049] 10 skeleton 20 Main beam (1st beam) 21 Web 22A (One) End Face 22B (other) end face 23 Web side bolt hole 23A First bolt hole on web side 23B Second bolt hole on web side 24 flange 30 Small beam (second beam) 31 Web 32 flange 33 End 34 T-plate (joint plate) 35 Second beam bolt hole 36 outer edge 37 Second beam side notch hole 38A Web section 38B flange part 40 Small beam (3rd beam) 41 Web 42 flange 43 End 44 T-plate (joint plate) 45 Third beam side cutout hole (cutout hole) 46 outer edge 47 Third beam bolt hole 50 volts 51 First Bolt 52 Tip 55 Second Bolt 56 Tip 60 nuts 61 First Nut 62 Second Nut 63A First fixing nut 63B Second fixing nut

Claims

1. A skeleton in which a second beam and a third beam located on opposite sides of a first beam intersect with the first beam and are fixed to the first beam, The joining plates of the second beam and the third beam are attached to each end of the second beam and the third beam, and are fastened together with a common bolt across the web of the first beam, The joining plate of the second beam is provided with a second beam side bolt hole communicating with a web side bolt hole formed in the web, and the joining plate of the third beam is provided with a cutout hole communicating with the web side bolt hole and formed to an outer edge of the joining plate of the third beam, The common bolt is inserted through the second beam-side bolt hole, the web-side bolt hole, and the notched hole, and a tip portion thereof protrudes from the notched hole. A structure characterized by the above.

2. The cutout hole is formed along the width direction of the joining plate of the third beam, The joining plate of the third beam is joined to the web of the first beam in a state where the width direction of the joining plate of the third beam coincides with the longitudinal direction of the web. The body according to claim 1.

3. The joining plate of the third beam has a third beam side bolt hole arranged at a position different from the notch hole in the width direction of the joining plate of the third beam, the web is provided with a first web-side bolt hole that is the web-side bolt hole communicating with the cutout hole, and a second web-side bolt hole that is in communication with the third beam-side bolt hole, The joining plate of the second beam is provided with the second beam side bolt hole communicating with the web side first bolt hole and a second beam side cutout hole communicating with the web side second bolt hole. The body according to claim 2.

4. the common bolt includes a first bolt and a second bolt; The first bolt is inserted through the second beam side bolt hole, the web side first bolt hole, and the notched hole, and the second bolt is inserted through the second beam side notched hole, the web side second bolt hole, and the third beam side bolt hole. The body according to claim 3.

5. A first nut is fixed to one end surface of the web of the first beam in alignment with the first bolt hole on the web side, and the first nut is fitted into the notched hole of the third beam, and a second nut is fixed to the other end surface of the web of the first beam in alignment with the second bolt hole on the web side, and the second nut is fitted into the notched hole on the second beam side. The body according to claim 3.

6. A method for constructing a skeleton in which a second beam and a third beam located on opposite sides of a first beam are fixed to the first beam in a state in which the second beam and a third beam intersect with the first beam, The joining plates attached to the respective ends of the second beam and the third beam are fastened together with a common bolt, sandwiching the web of the first beam therebetween. a step of placing the joining plate of the second beam opposite to the end surface of the web so that the second beam side bolt holes provided in the joining plate of the second beam communicate with the web side first bolt holes formed in the web; a step of inserting the common bolt into the web-side first bolt hole and the second beam-side bolt hole, which are arranged at positions communicating with each other due to the opposing relationship; a step of positioning the joining plate of the third beam so that a notch hole formed in the joining plate of the third beam to an outer edge thereof is fitted from the width direction of the joining plate toward the tip portion of the bolt protruding from the web-side first bolt hole onto the web end surface by the insertion; a step of fitting a nut onto the tip of the bolt that is fitted into the cutout hole according to the arrangement and protruding from the opening of the cutout hole, and tightening the nut to fasten the second beam joint plate, the first beam web, and the third beam joint plate together; A method for constructing a structure having the above structure.

7. By the co-tightening, the bolt and the nut are locked in the second beam side bolt hole, the web side first bolt hole, and the notch hole, The third beam-side bolt hole provided in the joining plate of the third beam is arranged at a position different from the notch hole in the width direction of the joining plate of the third beam, the web-side second bolt hole provided in the web and communicating with the third beam-side bolt hole, and the second beam-side notch hole provided in the joining plate of the second beam and communicating with the web-side second bolt hole are connected to each other, a step of inserting second bolts into the second beam-side cutout holes, the web-side second bolt holes, and the third beam-side bolt holes, and fitting second nuts onto the tip portions of the second bolts and tightening them to perform a second co-fastening; The skeleton construction method according to claim 6, further comprising:

8. a first fitting step of fitting the notched hole of the third beam into a first fixing nut fixed to one end surface of the web of the first beam in alignment with the first bolt hole on the web side from the width direction of the third beam; a second fitting step of fitting the second beam-side notched hole into a second fixing nut fixed to the other end surface of the web of the first beam in accordance with the web-side second bolt hole from the width direction of the second beam; a first co-tightening process of performing a first co-tightening by a second bolt on the second fixing nut, the web-side second bolt hole, and the third beam-side bolt hole that are connected through the first fitting process; a second co-tightening process of performing a second co-tightening process using a first bolt on the first fixing nut, the web-side first bolt hole, and the second beam-side bolt hole that are connected through the second fitting process; The skeleton construction method according to claim 7, further comprising:

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