Shaft end auxiliary member and connection structure of member using the same

Abstract

To provide a shaft end auxiliary member and a connection structure of a member using the same capable of increasing reliability of the shaft end auxiliary member while suppressing deterioration of workability and cost increase as much as possible.SOLUTION: A shaft end auxiliary member 50 is used for connecting cylindrical second members 20, 30 on flange parts 11, 12 of a first member 10 with bolts 40 and fixed on the second members 20, 30, the shaft end auxiliary member 50 being provided with: a substrate part 51, bolt holes 51a provided in the substrate 51, into which bolts 40 are inserted; nuts 52 placed at the bolt holes 51a, into which the bolts 40 are screwed; and a cover member 53 covering the nut 52 and fixed on the substrate part 51 to stop rotation of the nuts 52.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a shaft end auxiliary member used for connecting members in a building structure, and to a member connection structure using the shaft end auxiliary member. [Background technology]

[0002] An example of a structure of a building or structure (hereinafter collectively referred to as a building) using steel frames is described in Patent Document 1. This structure is also called a framework structure, and is constructed by erecting pillars at multiple points on the foundation and bridging horizontal beams between the pillars. If necessary, studs are erected between the foundation and the beams or between upper and lower beams, and girders are bridging adjacent beams. Furthermore, members at diagonal positions at 90 degrees from each other across the joint points of the members are connected with diagonal members called braces, and a roof truss is installed at the top. Generally, a framework structure refers to the framework of a building made of wood or steel, and is composed of a base (foundation), pillars, beams, girders, braces, etc.

[0003] In this type of frame structure, a horizontal beam is connected to the top of a vertically rising column. Also, above that column (called the first column), another column (called the second column) is connected with the beam in between.

[0004] In Patent Document 1, a plate-shaped shaft end auxiliary member is used when connecting a beam to the upper end of a first pillar member and when connecting a second pillar member above the beam member. The shaft end auxiliary member is inserted into the inside of a cylindrical pillar member (first pillar member or second pillar member) from the shaft end thereof and joined to the pillar member by welding.

[0005] A hole is formed in the shaft end auxiliary member that penetrates from the front to the back, and a nut is welded to the position of the hole. The nut is fixed to the front or back surface of the shaft end auxiliary member that faces the internal space of the column. A hole for inserting a bolt is formed in the upper flange or lower flange of the beam member at a location facing the column member. The bolt is inserted from the lower surface side of the upper flange of the beam member or the upper surface side of the lower flange of the beam member and screwed into the nut of the opposing shaft end auxiliary member to connect the beam member and the column member. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3764020 (page 5, see Figures 2 to 4) Summary of the Invention [Problem to be solved by the invention]

[0007] In the shaft end auxiliary member of Patent Document 1, a hole for inserting a bolt is formed in a plate-shaped base plate, and a nut is welded to the position of the hole. Therefore, if the welded part breaks due to poor welding or metal fatigue caused by repeated load, the joint strength between the column material and the beam material decreases. For this reason, the nut welding work requires careful attention, which is a factor of increased construction time and high costs.

[0008] In addition, since the nut is fixed to the front and back surfaces of the shaft end auxiliary member that face the internal space of the pillar, there is also the problem that it is difficult to visually check the welded portion between the nut and the base plate. If the welded portion is difficult to visually check, there is a possibility that a defect in the welded portion will be discovered late.

[0009] Therefore, an object of the present invention is to improve the reliability of the shaft end auxiliary member while minimizing deterioration of operability and increase in cost as much as possible. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides: In a shaft end auxiliary member used for joining a cylindrical second member to a flange portion of a first member with a bolt and fixed to the second member, the shaft end auxiliary member includes a base portion, a bolt hole provided in the base portion and through which the bolt is inserted, a nut positioned at the bolt hole and into which the bolt is screwed, and a cover member that covers the nut and is fixed to the base portion to prevent the nut from rotating (configuration 1).

[0011] In the configuration 1, a configuration can be adopted in which the cover member is fixed to the base portion by welding (configuration 2).

[0012] In addition, in configuration 1, a configuration can be adopted in which the cover member is fixed to the base portion, the bolt holes are provided in equal orientations around the cylindrical axis of the second member, and the fixing points of the cover member to the base portion are each set between adjacent bolt holes around the cylindrical axis (configuration 3).

[0013] In an embodiment having configuration 2 (including an embodiment having configurations 2 and 3), a configuration can be adopted in which the base portion has a step portion along its outer edge against which the axial end of the second member abuts (configuration 4).

[0014] In an embodiment having configuration 4, a configuration can be adopted in which the substrate portion has a polygonal shape in a plan view having multiple vertices along its outer edge, and the step portion is provided only in the portion where the vertices are located (configuration 5).

[0015] By using the shaft end auxiliary member of each of these embodiments, the shaft end auxiliary member is fixed to the second member so that the nut faces the inside of the second member, and the bolt is inserted through the through hole formed in the flange portion of the first member and the bolt hole of the shaft end auxiliary member and screwed into the nut, thereby adopting a fixing structure of a member in which the second member is joined to the flange portion of the first member (configuration 6).

[0016] Furthermore, by using a shaft end auxiliary member having configuration 4 (including configurations 4 and 5), the shaft end auxiliary member is fixed to the second member so that the nut faces the inside of the second member, and the second member is joined to the flange portion of the first member by inserting the bolt through a through hole formed in the flange portion of the first member and through the bolt hole of the shaft end auxiliary member and screwing it into the nut, and the base portion can be welded to the shaft end of the second member on the flange portion side relative to the step portion (configuration 7). Effect of the Invention

[0017] According to the present invention, it is possible to improve the reliability of the shaft end auxiliary member while minimizing deterioration of workability and increase in cost. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] Enlarged view of the main part of Figure 1 [Figure 4] FIG. 13 is a perspective view showing a state in which the shaft end auxiliary member is used; [Diagram 5] FIG. 1 is a perspective view showing a base plate portion and a nut of a shaft end auxiliary member; [Figure 6] FIG. 13 is a perspective view showing a cover member for the shaft end auxiliary member; [Figure 7] Front view of Figure 6 [Figure 8] Plan view of Figure 6 [Figure 9] IX-IX cross section of Figure 8 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] An embodiment of the present invention will be described with reference to the drawings. The present invention relates to a shaft end auxiliary member and a structure for connecting members using the shaft end auxiliary member. In the embodiment, the configuration of the present invention is described using a building (for example, a residence such as a detached house or an apartment building, an office, a store, a warehouse, a factory, etc.) as an example, but the present invention can also be applied to various other structures (for example, structures for use as scaffolding, stages, fences, steel towers, temporary structures, etc.).

[0020] The structure of the embodiment is also called a frame structure, and includes a plurality of columns 20 (referred to as lower columns 20) standing on a foundation, and horizontal beams 10 that span between the lower columns 20. The lower columns 20 are fixed to the foundation by fastening with anchor bolts embedded in the foundation. The lower columns 20 are provided at intervals along one direction, and the beams 10 are provided at intervals in the other direction perpendicular to the one direction, respectively, forming a lattice shape in plan view. In the claims, the lower columns 20 and the upper columns 30 in this embodiment are referred to as second members 20, 30, and the beams 10 are referred to as first members 10.

[0021] A beam 10 is connected to the upper end of the lower column 20. Also, another column 30 (referred to as upper column 30) is connected directly above the lower column 20, sandwiching the beam 10. The cylinder axes of the lower column 20 and the upper column 30 are the same. The lower column 20 and the upper column 30 have a length corresponding to the height of each floor, and are divided into upper and lower parts sandwiched between the beam 10 to form separate independent members for each floor. Depending on the height and number of floors of the building, another column may be connected above the upper column 30, sandwiching the beam 10 between them. In this case, the column below sandwiching the beam 10 corresponds to the lower column 20, and the column above sandwiching the beam 10 corresponds to the upper column 30.

[0022] 1 and 2, vertical partitions may be provided as necessary to connect the foundation and beams 10 or between upper and lower beams 10. Horizontal girders may also be provided to connect adjacent beams 10. Furthermore, braces may be provided between beams 10 diagonally at 90 degrees to each other across the joining points of the members, or between beams 10 and columns 20, 30.

[0023] As shown in Fig. 2, the beams 10 are connected to one another such that the end of the beam 10 in one direction faces the midway point in the longitudinal direction of the beam 10 in the other direction. The beams 10 in the other direction are disposed on both sides in the width direction of the beam 10 in the one direction, and the beams 10 are disposed at 90 degree angles to each other in a cross shape in plan view.

[0024] The beam 10 is a steel material (so-called H-shaped steel, etc.) with an H-shaped or I-shaped cross section, which includes an upper flange 11, a lower flange 12, and a web 13 connecting the upper flange 11 and the lower flange 12. The beams 10 are connected to each other by a gusset plate 15, as shown in Figs. 1 and 2. The gusset plate 15 is formed by bending a plate-like member, and includes a first portion 15a that is in surface contact with the side surface of the web 13 of the beam 10 in the other direction, a second portion 15b that is in surface contact with the side surface of the web 13 of the beam 10 in one direction, and a third portion 15c that is in surface contact with the lower surface of the upper flange 11 and the upper surface of the lower flange of the beam 10 in the one direction. The first portion 15a, the second portion 15b, and the third portion 15c each have a hole for inserting a bolt. The upper flange 11 and the lower flange 12 also have a hole 14 for inserting a bolt.

[0025] A first portion 15a of a gusset plate 15 is applied to the side surface of the web 13 of the beam 10 in the other direction from both sides thereof, and a bolt 16 is inserted through a hole in the first portion 15a, a hole formed in the web 13, and a hole in the first portion 15a on the opposite side, and the bolt 16 is fastened with a nut 17, thereby integrating the gusset plate 15 with the beam 10 in the other direction. A second portion 15b of a gusset plate 15 is applied to the side surface of the web 13 of the beam 10 in one direction from both sides thereof, and a bolt 16 is inserted through a hole in the second portion 15b, a hole formed in the web 13, and a hole in the second portion 15b on the opposite side, and the bolt 16 is fastened with a nut 17, thereby integrating the gusset plate 15 with the beam 10 in one direction. As shown in FIG. 2, four gusset plates 15 are used at one joint point of the beam 10 that is shaped like a cross in plan view.

[0026] A plate-shaped shaft end auxiliary member 50 is used to connect the lower column 20 and the beam 10, and to connect the beam 10 and the upper column 30. The shaft end auxiliary member 50 includes a plate-shaped base plate portion 51, a bolt hole 51a provided in the base plate portion 51 and through which the bolt 40 is inserted, a nut 52 that is positioned at the position of the bolt hole 51a and into which the bolt 40 is screwed, and a cover member 53 that covers the nut 52 and is fixed to the base plate portion 51 to prevent the nut 52 from rotating.

[0027] 3 and 4, the shaft end auxiliary member 50 is inserted into the interior of the axial end of the cylindrical lower pillar member 20 or upper pillar member 30, and joined to the lower pillar member 20 or upper pillar member 30 by welding. In the embodiment, since the lower pillar member 20 and the upper pillar member 30 have a hollow shape with a rectangular cross section, the base plate portion 51 of the shaft end auxiliary member 50 is also rectangular in plan view, and the periphery of the base plate portion 51 is welded to the lower pillar member 20 or upper pillar member 30. Note that the fixing of the base plate portion 51 to the lower pillar member 20 or upper pillar member 30 may be performed by a method other than welding, such as joining with bolts or screws.

[0028] As shown in Fig. 5, bolt holes 51a are formed in the base plate portion 51 so as to penetrate in the front-to-back direction, and nuts 52 are provided in accordance with the positions of the bolt holes 51a. In the embodiment, four bolt holes 51a and four nuts 52 are provided, but the numbers of bolt holes 51a and nuts 52 can be increased or decreased as appropriate. The nuts 52 are provided on the side of the base plate portion 51 that faces the internal space of the lower column material 20 or the upper column material 30, of the front and back surfaces. The axis of the nuts 52 and the axis of the bolt holes 51a are aligned.

[0029] 6 and 7, the cover member 53 has a flat base 53a that is in surface contact with the flat top surface of the base plate 51, and a protruding portion 53b that rises from the flat base 53a. The protruding portion 53b is composed of a rising side surface 53e that is made up of multiple surfaces (six surfaces in this embodiment) and a top surface 53c that covers the top of the side surface. The surface of the protruding portion 53b on the side of the base 53a is a recess that can accommodate the nut 52. The reference symbols 53d and 53g in the figures of the cover member 53 are lightening portions 53d, 53g for reducing the weight without affecting the strength.

[0030] The nut 52 has a hexagonal cross section perpendicular to the axis, and the inner surface of the protruding portion 53b (recess) also has a hexagonal shape corresponding to the nut 52. The nut 52 is placed on the base plate portion 51, and the cover member 53 accommodates the nut 52 in the recess, while the cover member 53 is fixed to the base plate portion 51 by welding or the like, so that the nut 52 is prevented from rotating. This makes it possible to omit welding each nut 52 to the base plate portion 51 as in the conventional method. The base plate portion 51 and the cover member 53 are in contact with each other over a wide range, so that it can be said that there is a high degree of freedom in selecting the joining position and joining structure. In the embodiment, the base portion 53a is provided with a welding hole 53f, so that welding (arc welding, etc.) at this position will result in good weld between the cover member 53 and the base plate portion 51. Note that this does not exclude the possibility of temporarily fixing the nut 52 to the base plate portion 51 (positioning, etc.) by welding or the like before fixing the cover member 53 to the base plate portion 51.

[0031] Also, instead of or in addition to joining the cover member 53 to the base plate portion 51, the cover member 53 may be joined to the lower pillar 20 or the upper pillar 30 by welding or other methods. Also, in the embodiment, the cover member 53 is a pressed product, but it may be manufactured by other methods such as forging or casting.

[0032] A method for joining the axial end 21 of the lower pillar 20 to the beam 10 will be described below.

[0033] Assume that the shaft end auxiliary member 50, which includes the base plate portion 51, the nut 52, and the cover member 53, has already been fixed to the shaft end 21 of the lower column member 20. The lower surface of the lower flange 12 of the beam member 10 is placed on the shaft end 21. The bolt insertion hole 14 of the lower flange 12 coincides with the position of the bolt hole 51a of the shaft end auxiliary member 50. The bolt 40 is inserted from the upper side of the lower flange 12 downward through the hole 14 of the lower flange 12 and the bolt hole 51a of the shaft end auxiliary member 50, and is screwed into the nut 52, thereby integrating the beam member 10 with the lower column member 20. The head 41 of the bolt 40 and the nut 52 in the figure fasten the lower flange 12 and the base plate portion 51 together. Such fastening is possible because the nut 52 is prevented from rotating by the cover member 53.

[0034] The joint between the shaft end 31 of the upper column member 30 and the beam member 10 is similar, except that the members are inverted upside down.

[0035] That is, the shaft end auxiliary member 50, which includes a base portion 51, a nut 52, and a cover member 53, is already fixed to the shaft end 31 of the upper column member 30. The shaft end 31 is placed on the upper surface of the upper flange 11 of the beam member 10. The bolt insertion hole 14 in the upper flange 11 coincides with the position of the bolt hole 51a in the shaft end auxiliary member 50. The bolt 40 is inserted from the lower side of the upper flange 11 upward through the hole 14 in the upper flange 11 and the bolt hole 51a in the shaft end auxiliary member 50, and is screwed into the nut 52, thereby integrating the upper column member 30 with the beam member 10.

[0036] In addition, the shape of the nut 52 and the shape of the protrusion 53b (shape of the recess) that acts to prevent the nut 52 from rotating may be any non-circular shape that can prevent the nut 52 from rotating, and is not limited to the hexagonal cross-sectional shape of the embodiment.

[0037] In this embodiment, the four bolt holes 51a are provided in equal orientations around the cylindrical axis of the lower column 20 and the upper column 30. The fixing points (welding points) w1 of the cover member 53 to the base plate portion 51 are set between the bolt holes 51a adjacent to each other around the cylindrical axis. This makes the fixing of the two more reliable. This is because there are multiple fixing points along the cylindrical axis for one protruding portion 53b. The fixing of the cover member 53 to the base plate portion 51 may be performed by a method other than welding, such as joining with bolts or screws. Even when joining with bolts or screws is used, the fixing points may be set between the bolt holes 51a adjacent to each other around the cylindrical axis.

[0038] In addition, in this embodiment, as shown in Figs. 4 and 5, a step 54 is formed along the outer edge of the base plate 51 with respect to the fixing of the base plate 51 to the pillars 20 and 30. The step 54 is abutted against the shaft end 21, 31 of the lower pillar 20 or the upper pillar 30, so that the base plate 51 is positioned so as not to penetrate further into the upper-lower pillar 20 or the upper pillar 30. In addition, the presence of the step 54 ensures a space for welding (arc welding, etc.) between the shaft end 21, 31 and the side of the base plate 51 (see Fig. 3), which also facilitates the welding. In the embodiment shown in Fig. 3, the base plate 51 has a flange 56 on the side of the abutment surface against the beam 10. The shaft end 21, 31 is engaged with the step 54, so that a part of the base plate 51 does not penetrate into the pillars 20 and 30, and the welded portion between the base plate 51 and the shaft end 21, 31 (see shaft end weld w2) is secured. The shaft end welded portion w2 may be along the entire outer edge of the base plate portion 51, or may be a part of it.

[0039] In this embodiment, the substrate portion 51 has a quadrangular (square) shape in plan view having four vertices 55 along its outer edge, and the step portion 54 is provided only in the portion where the four vertices 55 are present. However, the step portion 54 may be provided in a portion other than the vertices 55, or may be provided around the entire periphery of the substrate portion 51. The shape of the substrate portion 51 is free and may be various shapes, but it is preferable to match the cross-sectional shape of the pillar material 20, 30. For example, the shape of the substrate portion 51 may be a polygonal shape other than a quadrangular shape in plan view having a plurality of vertices 55 along its outer edge. In this case, too, the step portion 54 may be provided only in the portion where the vertices 55 are present, as described above, or may be provided in a portion other than the vertices 55, or may be provided around the entire periphery of the substrate portion 51. The substrate portion 51 is not limited to a plate-shaped member, and may be, for example, a block-shaped (rectangular parallelepiped) member. [Explanation of symbols]

[0040] 10 First member (beam) 11 Upper flange (flange part) 12 Lower flange (flange part) 20 Second member (lower column) 30 Second member (upper column) 21,31 Shaft end 40 Volts 41 Head 42 Nut 50 Shaft end auxiliary member 51 Circuit Board 52 Nut 53 Cover material 54 Step part w1 Fixing point w2 Shaft end weld

Claims

1. A shaft end auxiliary member (50) is used for joining a cylindrical second member (20, 30) to a flange portion (11, 12) of a first member (10) with a bolt (40), and is fixed to the second member (20, 30), The shaft end auxiliary member (50) includes a base plate portion (51), a bolt hole (51a) provided in the base plate portion (51) through which the bolt (40) is inserted, a nut (52) that is positioned at the bolt hole (51a) and into which the bolt (40) is screwed, and a cover member (53) that covers the nut (52) and is fixed to the base plate portion (51) to prevent the nut (52) from rotating.

2. 2. The shaft end auxiliary member according to claim 1, wherein the cover member (53) is fixed to the base portion (51) by welding.

3. 3. The shaft end auxiliary member according to claim 2, wherein the cover member (53) is fixed to the base plate portion (51), the bolt holes (51 a) are provided in equal orientations around the cylindrical axis of the second member (20, 30), and fixing points (w1) of the cover member (53) to the base plate portion (51) are respectively set between the bolt holes (51 a) adjacent to each other around the cylindrical axis.

4. 2. The shaft end auxiliary member according to claim 1, wherein the base portion (51) is provided along its outer edge with a step portion (54) against which the shaft end (21, 31) of the second member (20, 30) abuts.

5. 5. The shaft end auxiliary member according to claim 4, wherein the base plate portion (51) has a polygonal shape in a plan view having a plurality of vertices (55) along its outer edge, and the step portion (54) is provided only in the portion where the vertices (55) are located.

6. Using the shaft end auxiliary member according to any one of claims 1 to 5, The shaft end auxiliary member (50) is fixed to the second member (20, 30) such that the nut (52) faces the inner side of the second member (20, 30), A fixing structure for a member in which the second member (20, 30) is joined to the flange portion (11, 12) of the first member (10) by inserting the bolt (40) into a through hole (14) formed in the flange portion (11, 12) of the first member (10) and the bolt hole (51 a) of the shaft end auxiliary member (50) and screwing it into the nut (52).

7. Using the shaft end auxiliary member according to claim 4 or 5, The shaft end auxiliary member (50) is fixed to the second member (20, 30) such that the nut (52) faces the inner side of the second member (20, 30), the second member (20, 30) is joined to the flange portion (11, 12) of the first member (10) by inserting the bolt (40) through a through hole (14) formed in the flange portion (11, 12) of the first member (10) and the bolt hole (51 a) of the shaft end auxiliary member (50) and screwing the bolt (40) into the nut (52); The base plate portion (51) is welded to the shaft end (21, 31) of the second member (20, 30) on the flange portion (11, 12) side relative to the step portion (54).

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