JP7359355B1 - Beam joining equipment for square steel pipe columns - Google Patents

Abstract

[Problem] In a column structure in which an H-shaped steel beam is bolted to a square steel pipe column via a joining hardware, a non-bracket construction method that reduces the burden of welding work is used, and high-strength bolt head rotation inserted from the outside of the column is used. , provides a joining method that allows the positioning of the nut and washer to be adjusted within a minute range by tightening the nut inside the column. [Solution] A nut holding board with a nut and washer set is provided on the inner wall of the square steel pipe column, and when a high-strength bolt is inserted from the outside of the square steel column, the chamfered tip of the bolt comes into contact with the inner diameter part of the washer. At the same time, it passes through the inside diameter of the washer and comes into contact with the upper part of the screw opening of the nut. The contacted nut contacts the nut cover of the nut holding plate and threads the bolt. After that, as the bolt continues to rotate, the nut and washer move toward the head of the bolt along the thread, and the washer comes into contact with the inner wall of the square steel pipe column, causing the nut to tighten. [Selection diagram] Figure 1

Description

The present invention relates to a device for joining square steel pipe columns and H-shaped steel beams in a non-bracket construction method using square steel pipe columns in steel frame construction.

In recent years, bidirectional rigid-frame structures in which square steel pipes are used for the columns of steel-framed buildings and H-beam steel is used for the beams have been widely used. For example, as a means of obtaining a bidirectional rigid-frame structure as shown in Figure 5, a through-diaphragm type construction method is used in which a square steel pipe is cut at both flanges of an H-beam steel, a diaphragm plate is inserted therein, and then rejoined. The bracket method is generally known.

In Japanese Unexamined Patent Publication No. 11-269986 (first known example), as shown in FIG. 1, a non-bracket construction method is adopted, and as shown in FIG. At the same time, as shown in FIG. 6(b), the upper beam mounting plate 2p is brought into contact with the upper flange 9a of the H-shaped steel beam 4 and temporarily fastened with the high-strength bolts 16. At the construction site, the square steel pipe column 1 is erected at a predetermined position, and the base 2b temporarily fastened to the upper flange 9a of the H-shaped steel beam 4 is attached to the square steel pipe column. The square steel pipe column 1 and the H A joint structure for a shaped steel beam 4 is disclosed.

Japanese Patent Application Publication No. 11-269986

However, in the case of the through-diaphragm type (FIG. 5), high joint rigidity can be obtained, but on the other hand, there is a problem in that the cutting and welding work of the columns is heavy. For example, a square steel pipe column 1 is cut to match the height (height) of an H-shaped steel beam 12, and a through diaphragm (11a, 11b) is placed at both ends of the cut part of the square steel pipe column 1. Next, the upper and lower flanges of the bracket (H-shaped steel) 12 to be joined and the web, and the upper column of the through diaphragm 11a and the lower column of 11b, are connected in the upper and lower directions and in four directions, and in a narrow range. Because it involves welding, the joining method is highly difficult.

Although the first known non-bracket construction method eliminates the burden of welding in the through-diaphragm type, problems remain in the method of fastening bolts. For example, as shown in FIG. 6, the base 2b is fastened to the square steel pipe column 1 with high-strength bolts 16 in the factory, and temporarily fastened to the upper flange 9a of the square steel pipe column 1 and the H-shaped steel beam 4 at the construction site. In this method, the base portion 2b is fastened with a one-side bolt 24. Therefore, one-sided bolts, which are expensive and have a complicated mechanism, are used in about half of the cases, and this does not lead to a significant cost reduction.

The problem to be solved by the present invention is that in a beam joining device for square steel pipe columns, a nut holding plate is brought into contact with the inner wall surface of the square steel pipe column, and general high-strength bolts are used to solve the problem of the conventional joining method described above. This system is designed to solve this problem, and not only ensures stable joint strength, but also handles changes in bolt position within a certain minute range by tightening the nut by rotating a high-strength bolt head inserted from the outer surface of a square steel pipe column. The purpose is to provide a non-bracket construction method that reduces the burden of welding work.

A beam joining device for a square steel pipe column according to the present invention for solving the above problems is used in the structure of a square steel pipe column in which an H-shaped steel beam is bolted to the square steel pipe column via a joining hardware. A rectangular steel pipe column characterized in that a plurality of bolt holes matching the bolt holes of joining hardware and a plurality of nut holding plates are provided at predetermined positions on all sides of the face wall, and a plurality of nuts and washers are provided inside the nut holding plate. beam joining equipment.
Next, the nut and washer in the nut holding plate provided on the inner wall of the square steel pipe column have a structure that moves within a minute range due to the rotation of the bolt, and the bolt inserted into the bolt hole of the joint metal When inserted from the outside side of the column, the chamfered portion of the bolt tip contacts the upper part of the inner diameter part of the washer provided on the nut holding board, passes through the inner diameter part of the washer, and comes into contact with the upper part of the threaded hole opening of the nut. The contacted nut comes into contact with the inner surface of a lunch box-shaped nut cover forming a nut holding plate, and screws into the bolt. After that, as the screwed bolt continues to rotate, the nut and washer move along the thread of the bolt toward the head of the bolt, and the washer comes into contact with the inner wall of the square steel pipe column, causing the nut to tighten. Tightening occurs. It is characterized by the fact that this force causes the square steel pipe column and the joining hardware to come into close contact.
In the structure of the above-mentioned nut holding plate, the washer restraining plate has a rectangular plate surface forming the nut holding plate, which has been subjected to a plurality of die cutting processes to be larger than the shape of the washer, and the washer restraining plate. A thick plate with the same dimensions as the nut is made with multiple die-cuts to make it larger than the nut shape.The nut restraining plate is polymerized and multiple bolt holes are cut out on a thin steel plate. The present invention is characterized by a nut holding plate formed by combining a lunch box-shaped nut cover with the nut restraining plate side of the overlapping plate.

(A) According to the beam joining device for rectangular steel pipe columns according to the present invention, the prerequisite for tightening a high-tensile bolt is generally to rotate and tighten a nut. When joining an H-shaped steel column, since the column has an open cross section, it can be easily joined using general high-strength bolts. However, in the case of a square steel pipe column, it is generally impossible to tighten a nut from inside the steel pipe because of its closed cross section. The present invention is a system in which a nut can be tightened on the inner side of a square steel pipe column with respect to a high-strength bolt inserted from the outer side of the square steel pipe column. Therefore, it is possible to obtain an extremely practical joining means using general high-strength bolts.

(B) According to the beam joining device for square steel pipe columns according to the present invention, bolt construction methods for square steel pipe columns generally use expensive one-sided bolts, resulting in high costs. This construction method uses general high-strength bolts and is a system that can respond to changes in bolt position within a minute range. Therefore, it is a rational design for a wood hybrid building because it enables a significant cost reduction.

A three-dimensional explanatory diagram illustrating an example of the process in the beam joining apparatus for square steel pipe columns according to the present invention, showing a state in which the lower joint hardware is fixed to the square steel pipe column and a state in which the joint hardware is temporarily fixed to the upper part of the H-shaped steel beam. It is. FIG. 2 is a plan cross-sectional view showing an example of joining a square steel pipe column 1, a joining hardware 3, and an H-shaped steel beam 2 in the beam joining apparatus for square steel pipe columns according to the present invention. FIG. 3 is a three-dimensional explanatory view of a nut holding board according to the present invention, (a) is a three-dimensional view of the nut holding board, (b) is a nut cover, (c) is a nut restraining plate, (b) is FIG. 3 is a three-dimensional view of a washer restraint plate. FIG. 4 is a cross-sectional explanatory diagram showing an example of a nut tightening procedure in the functional process of the nut holding plate according to the present invention, (a) is a case where a high-strength bolt is inserted when a column is erected, and the nut and washer are placed on the bottom side. An explanatory diagram of the lowered state, (b) is an explanatory diagram of the state where the chamfered part of the bolt is in contact with the nut screw hole opening, (c) is an explanatory diagram of the nut in contact with the nut cover, and (d) is an explanatory diagram of the square shape. FIG. 2 is an explanatory diagram showing a state in which a metal joint is in close contact with a steel pipe column. It is a three-dimensional explanatory view showing a square steel pipe column of a through diaphragm type in a conventional bracket construction method.

Hereinafter, the best mode for carrying out the present invention will be described based on FIGS. 1 to 5. FIG. 1 shows an example of a process in the beam joining apparatus for square steel pipe columns according to the present invention, showing a state in which the lower joint hardware is fixed to the square steel pipe column and a state in which the joint hardware is temporarily fixed to the upper part of the H-shaped steel beam. It is a three-dimensional explanatory diagram. In this example, a square steel pipe column 1, an H-shaped steel beam 2, a joining hardware 3, a bolt hole 3a, a nut holding plate 4, a nut cover 4a, a nut restraint plate 4b, a washer restraint plate 4c, a bolt hole 5, and a nut 6. , a nut screw hole 6a, a nut hole 7, a high-strength bolt 8, a bolt chamfer 8a, a washer 9, a washer inner diameter portion 9a, and a washer hole 10. This will be explained below.

First, a method of connecting the square steel pipe column 1 and the H-shaped steel beam 2 will be explained. As shown in Fig. 1, bolt holes 5 are drilled in the square steel pipe column 1 at a factory to match the bolt holes 3a of the joining hardware 3, and bolt holes 5 are drilled in the inner wall surface of the square steel pipe column 1 to match the bolt holes 5. A nut holding plate 4 is provided. At the site, the metal fittings 3 are fastened to the lower part of the flange of the H-shaped steel beam 2 with high-strength bolts 8, and the metal fittings 3 are temporarily fixed and lifted onto the upper side of the flange of the H-shaped steel beam 2. This is a procedure for joining an H-shaped steel beam 2 to a steel pipe column 1 via an upper joining metal fitting 3.

Next, as shown in FIG. 2, a nut holding board 4 having a washer 9 and a nut 6 is fixed at the positions of the bolt holes 5 on four sides of the square steel pipe column 1 at a factory, and the joining metal fittings 3 are fixed at the factory. A high-strength bolt 8 is inserted into the nut 6 of the nut holding plate 4 through the bolt hole 3a, and the joining hardware 3 is connected to the square steel pipe column 1. Next, the H-shaped steel beam 2 is combined with the joining hardware 3 and fastened with bolts 8.

Next, the structure of the nut holding plate 4 will be explained. As shown in FIG. 3 (three-dimensional illustration), the nut holding board 4 is composed of a nut cover 4a, a nut restraining plate 4b, and a washer restraining plate 4c. This will be explained below.
First, the washer restraining plate 4c will be explained. As shown in FIG. 3, the washer restraining plate 4c is a rectangular plate machined to a predetermined size, and is provided with a plurality of washer holes 10 that are punched into a circular shape larger than the shape of the washer 9. As shown in FIG. 4, a plate thicker than the washer 9 is used.
Next, the nut restraint plate 4b will be explained. As shown in FIG. 3, the nut restraint plate 4b is a plate having the same dimensions as the washer restraint plate 4c, and as shown in FIG. 4(b). As shown, a plurality of nut holes 7 larger than the shape of the nut 6 are formed using a thicker plate than the washer restraining plate 4c.
Next, the nut cover 4a will be explained. As shown in FIG. 3, the nut cover 4a is made by processing a steel plate (thin plate) into a bento box shape according to the plate dimensions of the nut restraining plate 4b, and forming bolt holes. 5 is being processed multiple times.

The joining structure of each component of the nut holding plate 4 described above will be explained. What is shown in FIG. 3 is a three-dimensional explanatory diagram when each component is assembled. First, a washer restraint plate 4c and a nut restraint plate 4b are stacked on top of each other, and the joints are welded to produce a superposition board. Subsequently, both ends of the nut cover 4a are aligned with both ends of the nut restraining plate 4b of the stacking disc and fixed by welding to form the nut holding disc 4.

Next, an example of a procedure for tightening a nut on the nut holding plate 4 will be explained based on FIG. 4.
(1) As shown in Fig. 4(a), the bolt 8 and washer 9 set at the factory move to the bottom side when the column is erected, and by inserting the bolt 8 into the bolt hole 5 of the joining hardware 3, The bolt chamfered portion 8a of the high-strength bolt 8 contacts the upper side of the washer inner diameter portion 9a of the washer 9. The contacted washer 9 slightly moves upward along the slope of the bolt chamfer 8a, and the high-strength bolt 8 passes through the washer inner diameter portion 9a.
(2) As shown in FIG. 4(b), the bolt chamfered portion 8a of the high-strength bolt 8 that has passed through the inner diameter portion 9a of the washer comes into contact with the screw hole opening 6a of the nut 6. The contacted nut 6 moves slightly upward along the slope of the bolt chamfer 8a.
(3) As shown in Fig. 4(c), the nut 6 that has moved slightly upward moves and comes into contact with the inner surface of the lunch box-shaped nut cover 4a that forms the nut holding plate, and the high-strength bolt Screw 8 together.
(4) As shown in FIG. 4(d), as the high-strength bolt 8 continues to rotate, the nut 6 to which the high-strength bolt 8 is screwed will rotate along the thread of the high-strength bolt 8. The washer 9 moves toward the head side while contacting the nut hole 7 of the nut restraining plate, and the washer 9 comes into contact with the square steel pipe column 1, and as the nut 6 is tightened, a tensile force is applied to the shaft of the high-strength bolt 8. This force causes the rectangular steel pipe column 1 and the joining hardware 3 to come into close contact with each other. Further, as shown in FIG. 4(d), the nut hole 7 is machined into a shape that is one size larger than the nut 6, and the washer hole 10 is also punched into a circular shape larger than the diameter of the washer 9. The nut 6 and the washer 9 have a structure that allows them to move within a minute range in all directions (up, down, left and right).

1 Square steel pipe column 2 H-shaped steel beam 3 Joint hardware 3a Bolt hole 4 Nut holding plate 4a Nut cover 4b Nut restraint plate 4c Washer restraint plate 5 Bolt hole,
6 Nut 6a Nut screw hole opening 7 Nut hole 8 High strength bolt 8a Bolt chamfer 9 Washer 9a Washer inner diameter 10 Washer hole 11a Through diaphragm upper 11b Through diaphragm lower 12 Bracket (H-shaped steel)

As explained above, in the beam joining apparatus for square steel pipe columns according to the present invention, a nut inside the column is screwed into a high-strength bolt inserted from the outside surface of the joining hardware. Therefore, the bolt fastening time is shortened, the workability of the joint is improved, and construction costs can be reduced. Furthermore, it uses common high-strength bolts, making it possible to save money without using expensive high-strength one-sided bolts. Furthermore, the use of square steel pipes in the framework of wood-based hybrid fireproof buildings, which are currently under development, will enable rational design. Therefore, the utility of the construction industry to society is extremely large.

Claims (2)

In the structure of a square steel pipe column in which an H-shaped steel beam is bolted to a square steel pipe column via a joining hardware, a plurality of bolt holes that match the bolt holes of the joint hardware are provided at predetermined positions on all four sides of the inner wall of the square steel pipe pillar. and a plurality of nut holding plates, the beam joining device for a square steel pipe column having a plurality of nuts and washers inside the nut holding plate, wherein the nut holding plate provided on an inner wall of the square steel pipe column has a plurality of nuts and washers. The nut and washer have a structure that moves within a minute range as the bolt rotates, and when the bolt inserted into the bolt hole of the joint metal is inserted from the outside of the square steel pipe column, the chamfered part at the tip of the bolt will move in a small range. While contacting the upper part of the inner diameter part of the washer provided on the holding plate, the nut passes through the inner diameter part of the washer and comes into contact with the upper part of the screw hole opening of the nut. When the nut and washer come into contact with the inner surface of the nut cover and screw together the bolt, and the screwed bolt continues to rotate, the nut and washer move along the thread of the bolt toward the head of the bolt. A beam joining device for a square steel pipe column, characterized in that the washer comes into contact with the inner wall of the square steel pipe column, tightening the nut, and the force causes the square steel pipe column and the joining hardware to come into close contact. In the nut holding plate, a washer restraining plate is formed by performing a plurality of die-cutting operations on a rectangular plate surface forming the nut holding plate to be larger than the washer shape, and a plate having the same dimensions and thicker thickness as the washer restraining plate. A bento box-shaped nut cover with multiple bolt holes cut out from a thin steel plate is attached to the overlapping plate formed by overlapping nut restraint plates with multiple die-cuts made to be larger than the nut shape. 2. The beam joining device for square steel pipe columns according to claim 1, further comprising a nut holding plate formed in combination with the nut restraining plate side of said overlapping plate.