Column joint structure

Abstract

To provide a column joint structure which can lower the height of a structure part which becomes a column joint.SOLUTION: A column joint structure 1 includes: an inner arrangement joint body 2 which has female screw holes 21a orthogonal to and penetrating through flat surface parts 21 having four faces forming a quadrangle conical shape or a quadrangle conical trapezoid fixed to an end part plate 71 of one column part 7; and an outer arrangement joint body 3 which has contact flat plate parts 31 having four faces coming into contact with the inner arrangement joint body 2, which has bolt insertion holes 31a orthogonal to and penetrating through the contact flat plate parts 31 and communicating with the female screw holes 21a at the respective contact flat plate parts 31, and which is fixed to an end part of the other column part 8. Both screw bolts 4 are inserted in the bolt insertion holes 31a, one end side screw parts 41 of both screw bolts 4 are screwed into the female screw holes 21a, and tips of the one end side screw parts 41 come into contact with the end part plate 71. A nut 5 is screwed to the other end side screw parts 42 of both screw bolts 4, and the nut 5 presses each contact flat plate part 31 of the outer arrangement joint body 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a column joint structure for joining column sections arranged above and below each other. [Background technology]

[0002] Patent Document 1 discloses a column joint block that connects upper and lower steel pipe columns. This column joint block has an end plate that is rectangular in plan view and has bolt holes opened near corners of the rectangle, and a hollow steel main body that has an outer shape with a notch where a corner of a square column is cut out, one end of the main body is fixed to the end plate with the notch aligned with the bolt hole, and the other end of the main body has a groove for welding to the steel pipe column. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2020-41333 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the column joint block described in Patent Document 1, when the bolt inserted into the bolt hole is tightened with an electric shear wrench, the electric shear wrench is held vertically and the socket is fitted into the head of the bolt. Therefore, the column joint block has to be made taller so that the vertically positioned electric shear wrench can fit in, resulting in the problem that more material is used for the column joint block, making the column joint structure expensive.

[0005] An object of the present invention is to provide a column joint structure that can reduce the height of the structural part that serves as the column joint. [Means for solving the problem]

[0006] In order to solve the above problems, the column joint structure of the present invention is a column joint structure for joining column parts arranged above and below to each other, An internally disposed joint body having a four-sided flat portion forming a quadrangular pyramid or a quadrangular pyramid trapezoid fixed to an end plate of one of the columns, and a female screw hole penetrating the four flat portions perpendicularly to the flat portions; an outer joint having four contact plate portions that contact the outer surface of the inner joint, and each contact plate portion having a bolt insertion hole that passes through the contact plate portion perpendicularly and communicates with the female screw hole, and is fixed to the end of the other column portion; The two threaded bolts are passed through the bolt insertion holes, and the threaded portions on one end of the two threaded bolts are screwed into the female threaded holes so that the tips of the threaded portions on one end abut against the end plate, A nut is screwed onto the other end threads of both the threaded bolts, and the nut presses the contact flat plate portions of the outer joint body.

[0007] With the above configuration, the two screw bolts that are screwed into the female screw holes of the inner joint through the bolt insertion holes that penetrate perpendicularly to the contact plate portions on the four sides of the outer joint are arranged diagonally, and the nuts can be tightened to the two screw bolts arranged diagonally using an electric shear wrench. In other words, since the electric shear wrench that tightens the nuts can be used diagonally horizontally rather than vertically, the height of the column joint structure can be made lower than the height of the electric shear wrench when it is vertical, and it is possible to reduce the materials used for the inner joint and the outer joint, thereby reducing costs.

[0008] The external joint may be made of a casting, which makes it easier to manufacture the external joint having a complex structure and reduces the manufacturing cost.

[0009] The inner edge of the female screw hole in the internal joint may be close to the end plate. In this way, the tip of the one-end threaded portion of each of the two threaded bolts comes out of the female screw hole and abuts against the upper surface of the end plate immediately, so that the length of the one-end threaded portion can be made as short as possible.

[0010] The outer circumference of the contact position between the end plate of the one column and each flat portion of the internally disposed joint may be partially welded, thereby making it possible to prevent deformation of the female screw hole formed before the welding.

[0011] In addition, the internally disposed joint may be fixed to the upper end of a column portion arranged on the lower side, and the externally disposed joint may be fixed to the lower end of a column portion arranged on the upper side. Effect of the Invention

[0012] The present invention has the effect of lowering the height of the structural part that serves as the column joint, thereby achieving cost reduction. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is an explanatory diagram showing the column joint structure of the embodiment and showing how the nut is tightened with an electric shear wrench. [Diagram 2] 3. FIG. 4 is an enlarged view of the column joint structure of FIG. 1, and is a schematic cross-sectional view corresponding to the view taken along the line AA in FIG. [Diagram 3] 1 is a schematic plan view of an internally disposed joint body arranged on a lower column portion in a column joint structure according to an embodiment of the present invention. FIG. [Figure 4] 10 is an explanatory diagram showing the fitting of an inner joint body and an outer joint body in a column joint structure of an embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in Figures 1 and 2, a column joint structure 1 of the embodiment joins a lower column portion 7 arranged on the lower side and an upper column portion 8 arranged on the upper side to each other.

[0015] The column joint structure 1 has an inner joint 2 and an outer joint 3. In this embodiment, the inner joint 2 is fixed by welding to a square end plate 71 located at the top of a lower column section 7 made of a square steel pipe, and the outer joint 3 is fixed by welding to a square lower end face of an upper column section 8 made of a square steel pipe.

[0016] The internally disposed joint 2 has an outer surface shape of a regular square pyramid trapezoid with an inclination angle of 60 degrees with respect to the upper surface of the end plate 71. The four flat surfaces 21 of this square pyramid trapezoid have female screw holes 21a formed therein, which penetrate the flat surfaces 21 perpendicularly. Two female screw holes 21a are formed side by side in each flat surface 21. The innermost edges of the female screw holes 21a are located close to the upper surface of the end plate 71.

[0017] As shown in Figures 3 and 4, the internally disposed joint 2 is fabricated by, for example, fixing four substantially trapezoidal steel plates to each other by welding. Each steel plate has a surface parallel to the upper surface of the end plate 71, and, for example, the longitudinal section of this steel plate is a parallelogram. The rectangular outer edge of the lower surface of the internally disposed joint 2 is smaller than the rectangular shape of the end plate 71, and the outer edge of the lower surface of the internally disposed joint 2 is located within a predetermined distance from the four edges of the upper surface of the end plate 71. The welding of the internally disposed joint 2 to the end plate 71 is performed by partial penetration welding (see symbol B) in the vicinity of the outer periphery of the contact position between the end plate 71 and each flat portion 21 (the outer edge of the lower surface of each flat portion 21).

[0018] The outer joint 3 has four contact plate portions 31 that come into planar contact with the flat portion 21 of the inner joint 2. The outer joint 3 also has a joining plate portion 32 welded to the lower end surface of the upper column portion 8, and an inverted pyramid truncated portion 33 that connects the joining plate portion 32 to the upper portion of the four contact plate portions 31. Each contact plate portion 31 has a bolt insertion hole 31a that is perpendicular to the contact plate portion 31, penetrates the contact plate portion 31, and leads to the female screw hole 21a. The outer joint 3 is made of casting, and the surface portion of the contact plate portion 31 that comes into contact with the flat portion 21 is surface-treated to obtain a predetermined friction coefficient.

[0019] Both screw bolts 4 are inserted into each bolt insertion hole 31a. Both screw bolts 4 have a one-end screw portion 41, an other-end screw portion 42, and a threadless portion 43 located in the middle between them. A left-handed (counterclockwise) fixing screw is formed in the one-end screw portion 41, and a right-handed (clockwise) nut tightening screw is formed in the other-end screw portion 42. A pintail 42a is formed integrally with the other-end screw portion 42 at the tip side of the other-end screw portion 42.

[0020] The one-end threaded portion 41 of each of the two threaded bolts 4 is screwed into the female screw hole 21a until the tip of the one-end threaded portion 41 touches the upper surface of the end plate 71. This screwing is performed by using a socket dedicated to the pintail and screwing it all the way in with an impact wrench.

[0021] A nut 5 with a washer is screwed onto each of the other end side screw portions 42, and this nut 5 presses each of the contact flat plate portions 31 of the outer joint body 3. The nut 5 is first attached by hand tightening, and then fully tightened with an electric shear wrench 100.

[0022] With the above configuration, both screw bolts 4 that are screwed into the female screw holes 21a of the inner joint 2 through the bolt insertion holes 31a that penetrate perpendicularly to the four contact plate portions 31 of the outer joint 3 are arranged diagonally, and the nuts 5 can be tightened to both screw bolts 4 arranged diagonally using the electric shear wrench 100. In other words, since the electric shear wrench 100 that tightens the nuts 5 can be used diagonally horizontally rather than vertically, the height of this column joint structure 1 can be made lower than the height of the electric shear wrench 100 when it is vertical, and the materials used for the inner joint 2 and the outer joint 3 can be reduced, thereby reducing costs.

[0023] Furthermore, when the outer joint body 3 is made of a casting, the outer joint body 3 having a complex structure can be easily manufactured, and the manufacturing cost can be reduced.

[0024] When the inner edge of the female screw hole 21a in the internally disposed joint 2 approaches the upper surface of the end plate 71, the tip of the one-end side screw portion 41 of each of the two screw bolts 4 comes out of the female screw hole 21a and immediately hits the upper surface of the end plate 71, so that the length of the one-end side screw portion 41 can be shortened as much as possible. Note that the internally disposed joint 2 has an outer surface shape of a regular square pyramid with an inclination angle of 60 degrees relative to the upper surface of the end plate 71, but the inclination angle may be any angle at which the tip of the one-end side screw portion 41 of each of the two screw bolts 4 hits the upper surface of the end plate 71, and is not limited to the above 60 degrees.

[0025] The welding of the internally disposed joint 2 to the end plate 71 is performed by partial penetration welding near the outer periphery of the contact position between the end plate 71 and each flat portion 21 (the outer edge of the underside of each flat portion 21), thereby making it possible to avoid deformation of the female screw hole 21a formed prior to this welding.

[0026] In addition, in the column joint structure 1 of this embodiment, the internally disposed joint 2 is fixed to the upper part of the lower column section 7, and the externally disposed joint 3 is fixed to the lower end surface of the upper column section 8, but this is not limited to this, and the structure may also be such that the internally disposed joint 2 is fixed to the lower end surface of the upper column section 8, and the externally disposed joint 3 is fixed to the upper part of the lower column section 7.

[0027] In addition, in the column joint structure 1 of this embodiment, the outer shape of the internally disposed joint body 2 is a trapezoidal pyramid shape, but is not limited to this, and may be a quadrangular pyramid shape.

[0028] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0029] 1: Column joint structure 2: Internally placed zygote 3: External placement zygote 4: Double-threaded bolt 5: Nut 7: Lower column part 8: Upper column 21: Flat part 21a: Female screw hole 31: Contact flat plate part 31a: Bolt insertion hole 32: Joint plate part 33: Inverted square pyramid part 41: One end screw part 42: Screw part on the other end 42a: Pintail 43: Screwless section 71: End plate 100: Electric shear wrench

Claims

1. A column joint structure for joining columns arranged above and below each other, an internally disposed joint body having four flat surfaces forming a quadrangular pyramid or quadrangular pyramid trapezoid fixed to an end plate of one of the columns, the flat surfaces having female screw holes passing through the flat surfaces perpendicular to the flat surfaces; an outer joint having four contact plate portions that contact the outer surface of the inner joint, and each contact plate portion having a bolt insertion hole that passes through the contact plate portion perpendicularly and communicates with the female screw hole, the outer joint being fixed to the end of the other column portion; The two threaded bolts are passed through the bolt insertion holes, and the threaded portions on one end of the two threaded bolts are screwed into the female threaded holes so that the tips of the threaded portions on one end abut against the end plate, A column joint structure characterized in that a nut is screwed onto the other end threaded portions of both of the threaded bolts, and this nut presses each contact flat portion of the outer joint body.

2. 2. The column joint structure according to claim 1, wherein the externally disposed joint body is made of a casting.

3. 2. The column joint structure according to claim 1, wherein the inner end edge of the female screw hole in the internally disposed joint body is adjacent to the end plate.

4. 2. The column joint structure according to claim 1, wherein the outer periphery of the contact position between the end plate of the one column portion and each flat portion of the internally disposed joint is partially welded.

5. 2. The column joint structure according to claim 1, wherein the internally disposed joint is fixed to the upper end of the column portion located on the lower side, and the externally disposed joint is fixed to the lower end of the column portion located on the upper side.

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