JPH03169951A - Square steel tube column - Google Patents

Abstract

PURPOSE:To prevent the outside face deformation of the side part of a square- shaped steel tube by providing holes for through-members on the side surface part of the steel tube, where a beam bracket is welded, as well as on the side surface parts adjacent to said side surface part to insert through-bolts thereinto and filling concrete in the steel tube. CONSTITUTION:Holes 13 for through-bolts are provided on the side surface part of a square-shaped steel tube 11, where a beam bracket 12 made of an H-steel is welded, as well as on the side surface parts on both sides adjacent to said side surface part. The beam bracket 12 is welded to the side surface part of the steel tube 11, and throughbolts 14 are inserted into the holes 13 for bolts via washerlike plate members 17, 18 to be provisionally fixed. Concrete 15 is then filled at least in the insertion area of the through-bolts 14 in the steel tube 11. Then, after the hardening of the concrete 15, the through-bolts 14 are properly fixed. Thus, the outside face deformation of the side part of the steel tube 11 can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a steel pipe column. [Prior Art] When forming a steel pipe column in which a beam bracket is joined to the side of a square steel pipe, as shown in FIG. It is necessary to form a joint that appropriately transmits compressive stress (or compressive stress) and to prevent harmful out-of-plane deformation (bulge) of the side surface of the steel pipe 1. As shown in FIG. 5, the column-to-beam joint of a steel pipe column that transmits such stress has conventionally been constructed by cutting a steel pipe 1 and connecting the upper and lower cut steel pipes 1 to each other. In some cases, a diaphragm 3 is welded to the diaphragm 3, and a beam bracket 2 is welded to the diaphragm 3. According to this, the tensile force acting on the beam bracket 2 at a certain side of the steel pipe 1 is
Due to the diaphragm 3, the stress is transmitted to other side surfaces of the steel pipe 1, and as a result, the above-mentioned out-of-plane deformation is prevented by dispersing the tensile force, and appropriate stress transmission can be performed (see Fig. 4 (B) @).
．． However, in the case of a steel pipe column using the diaphragm 3, there are the following problems: ■ Cutting the steel pipe 1 and welding the diaphragm 3 between the cut upper and lower steel pipes 1 requires a large number of processing steps; Since the diaphragm 3 prevents the filling of concrete into the inside of the column, there are disadvantages such as the inability to form a steel pipe-concrete composite column with good vertical load transferability.

Therefore, we developed a steel pipe column that can prevent out-of-plane deformation of the side part of the steel pipe and fill the inside of the steel pipe with concrete without increasing the number of machining steps.
7 is proposed. As shown in FIG. 6, this steel pipe column has a pair of upper and lower joint fittings 5 fixed to the sides of the steel pipe 1 by through bolts 4 passing through the opposite sides of the steel pipe 1.
Furthermore, concrete 6 is filled in the through-bolt penetrating portion, so that a beam 7 can be joined to the joint hardware 5.

[Problems to be Solved by the Invention] However, the prior art disclosed in Japanese Unexamined Patent Publication No. 57-209357 mentioned above has the following problem (2).

■The force transmitted from the joint hardware 5 to the steel pipe 1 is transmitted indirectly via the through bolt 4, and the force transmission between the beams is poor. ■When joining the beams 7 on-site, the beams 7 must be inserted into the space between the upper and lower joint hardware 5, but this insertion is difficult and the workability is poor.

Incidentally, the present applicant has proposed a steel pipe tube 10 as shown in FIG.

As shown in FIG. 7, this steel pipe column 10 includes a square steel pipe 11
Through-bolt holes 13 are provided in the side surface to which the H-shaped steel beam bracket 12 is welded, and in the side surface opposite to this side surface, and the beam bracket 12 is inserted into the through-bolt hole 13 in the side surface of the steel pipe 11. With the through bolts 14 inserted into the through bolt holes 13 provided in the two opposing side surfaces of the steel pipe 11 temporarily fastened, the steel pipe 11
At least the through-bolt 14 insertion area in the concrete 15 is filled with concrete 15, and after the concrete 15 hardens, the through-bolt 14 is permanently fixed to the two opposing side surfaces.

At this time, washer-like plates 17 and 18 are provided between the nut 16 screwed onto the threaded portions at both ends of the through bolt 14 and the opposing side surfaces of the steel pipe 11.

The plate material 17 is long and is disposed close to the outside of the upper and lower flanges of the beam bracket 12. The plate material 18 is short, and is located inside the upper and lower flanges of the beam bracket l2.
and are disposed adjacent to both sides of the web.

A beam 21 is joined to each of the beam brackets 12 described above, as shown in FIG. Beam bracket 12 and beam 21
are joined by a joint piece 22 which is web-butted with a corresponding flange and bolted to both.

According to the above-mentioned steel pipe column 10, due to the presence of the through bolt 14, as shown in FIG.
1. Out-of-plane deformation of the side part of the steel pipe 11 can be prevented, ■ The inside of the steel pipe 11 can be filled with concrete 15, and ■ The force acting on the steel pipe 11 from the beam bracket 12 can be directly applied at the welded part between the two. It is transmitted to the beam, and the force transmission between each beam is good.
(2) The beams 21 can be easily joined on-site using the nine-piece piece 22.

However, in the above-mentioned steel pipe column 10, when the beam bracket l2 is welded to both adjacent side parts of the steel pipe 1l, the through bolt 1 inserted through one of those both side parts.
4 and the through bolt 14 inserted into the other must be inserted at different insertion levels in the longitudinal direction of the steel pipe 11 to avoid interference with each other. For this reason, (1) the joint level of the through-bolt holes 13 to be provided on each side of the steel pipe 11 is not uniform, making the joint configuration complicated; (2) the bolts are inserted at a level farther away from the welded part of the beam bracket 12; through bolt 1
A relatively large moment is generated on the side surface of the steel pipe 11 to which the steel pipe 11 is locked, which has some disadvantages in preventing the above-mentioned out-of-plane deformation. The through bolts 14 that are inserted become intertwined in a plane inside the steel pipe 11, impairing the fluidity of the concrete 15 inside the steel pipe 11.

The present invention simplifies the joint structure of a steel pipe column that can prevent out-of-plane deformation of the side portion of the steel pipe and allow concrete filling inside the pipe, and improves the transmission of force between the beams and the construction. The purpose is to improve the quality and health of children.

[A Thousand Steps to Solve the Problem] The present invention as set forth in claim 1 provides a hole for a through member in a side surface portion of a square steel pipe to which a beam bracket is welded and a side surface portion adjacent to this side surface portion. , a beam bracket is welded to a portion of the side surface of the steel pipe near the hole for the through member, and the through member inserted into the hole for the through member provided on the two adjacent side surfaces of the steel pipe is temporarily fixed, This steel pipe column is constructed by filling at least the through member insertion area within the steel pipe with concrete, and after the concrete hardens, the through member is permanently fixed to the two adjacent side surfaces as necessary.

According to a second aspect of the present invention, the through member is a through bolt, and a washer-like plate material is provided between a nut screwed onto the through bolt and a side surface of the steel pipe.

[Function] According to the present invention as set forth in claim 1, there are the following effects (1) to (4). (2) The tensile force acting on the beam bracket acts in a direction that causes out-of-plane deformation (bulge) of the surface section of the steel pipe to which the beam bracket is welded. At this time, the side surface of the steel pipe near the welded part of the beam bracket is connected to the adjacent side surface using a through member. Therefore, the tensile force is transmitted to other side surfaces of the steel pipe via the through member, and as a result, the above-mentioned out-of-plane deformation can be prevented by dispersing the tensile force. In other words, it is possible to prevent out-of-plane deformation of the side portion of the steel pipe and to perform appropriate stress transmission without requiring a large number of man-hours such as cutting the steel pipe and welding the diaphragm. ■A through member is inserted into the inside of the steel pipe, but this through member does not hinder the filling of concrete, but rather ensures more reliable load transfer between the concrete and the steel pipe. Therefore, a steel pipe-concrete composite column with good vertical load transferability can be formed.

However, in the present invention, it is not essential to fill the entire length of the steel pipe with concrete, but the concrete is filled in at least the area where the through member is inserted in the steel pipe and hardens. The concrete that has hardened in the area where the through member is inserted prevents (1) out-of-plane deformation (indentation) toward the inside of the steel pipe when the through member is permanently fastened, and (2) disperses the tensile force in (3) above. Prevents out-of-plane deformation (indentation) inward of other surface measurement parts of the steel pipe.

■The force acting on the steel pipe from the beam bracket is directly transmitted from the welded part between the two, and the force transmission between the beams is good.

■When joining beams on-site, the normal joint structure of joining beams to beam brackets can be used, making workability easier.

■Furthermore, in the present invention, when the beam bracket is welded to both of the adjacent Il1l1 side parts of the steel pipe, the passing member inserted through the adjacent side parts can pass through the center of the steel pipe. Therefore, the insertion level of the through member inserted into each side of the steel pipe can be arranged at the same level (in the same plane) in the longitudinal direction of the steel pipe.For this reason, ■ holes for the through member to be provided on each side of the steel pipe The joint level becomes uniform and the joint structure becomes simple. ■The distance between the position where each through member locks on the side of the steel pipe and the welded part of the beam bracket is
Each passing member is the same, and due to the unevenness of the distances mentioned above, a large moment is not exerted on any side surface of the steel pipe compared to the other side surface, and out-of-plane deformation of each side surface is effectively prevented. ■Threading members that are inserted into the holes provided on each side of the steel pipe do not become intertwined on a plane inside the steel pipe, and do not impair the fluidity of concrete inside the steel pipe. For,
Can be completely filled with concrete.

According to the present invention as set forth in claim 2, there is the following effect (2). ■By placing the edge of the washer-like plate close to the welded part of the beam bracket to the side of the steel pipe,
The above-mentioned tensile force dispersion effect of the threading member and the out-of-plane deformation suppressing effect of the side surface portion of the steel pipe can be more effectively exerted.

[Example] Fig. 1 is a perspective view showing one embodiment of the present invention, and Fig. 2 is a perspective view showing an embodiment of the present invention.
3 is a schematic diagram showing the construction process of the steel pipe column of the present invention, FIG. 4 is a schematic diagram showing the operation of the present invention, and FIG. 5 is a perspective view showing the conventional steel pipe column. FIG. 6 is a sectional view showing another conventional steel pipe column, and FIG. 7 is a sectional view showing a steel pipe column proposed by the applicant.

As shown in FIGS. 1 to 3, the steel pipe column 10 has a side surface of the square steel pipe 11 to which the H-shaped steel beam bracket 12 is welded, and side surfaces adjacent to each other on both sides of this side surface. A through-bolt hole 13 was provided, and a beam bracket 12 was welded to a portion of the side surface of the steel pipe 11 near the through-bolt hole 13, and was provided so as to intersect at 45 degrees with the adjacent side surface of the steel pipe 11. Through bolt 14 inserted into through bolt hole 13
With the through bolts 14 temporarily fastened, concrete 15 is filled in at least the through bolt 14 insertion area in the steel pipe 11, and after the concrete 15 hardens, the through bolts 14 are permanently fastened to the adjacent side surfaces. Ru. At this time, washer-like plates 17 and 18 are provided between the nut 16 screwed onto the threaded portions at both ends of the through bolt 14 and the adjacent side surfaces of the steel pipe 11. The plate material 17 is long and is disposed close to the outside of the upper and lower flanges of the beam bracket 12. The plate material 18 is short, and the beam bracket 1
It is located inside the upper and lower flanges of 2 and close to both sides of the web. The structural example shown in Fig. 1 is a steel pipe column IO in which beam brackets 12 are welded to three side surfaces: the rear copper surface and both left and right side surfaces. A beam 21 is connected to each of the beam brackets 12 described above, as shown in FIG. Beam bracket 12 and beam 21
are joined by a joint piece 22 which is web-butted with a corresponding flange and bolted to both.

Next, the construction process of the steel pipe column 10 will be explained (see FIG. 3).

(1) Holes 13 for through bolts are provided in adjacent side surfaces of the steel pipes 11.

(2) Weld the beam bracket l2 to the side surface of the steel pipe 11.

(3) Through-bolt 14 via washer-like plate materials 17 and 18
Temporarily fasten.

(4) Fill the inside of the steel pipe 11 with the same concrete 15. (5) Secure the steel pipe on the concrete 15 with the through bolt 14.

Next, the operation of the above embodiment will be explained. (2) The tensile force acting on the beam bracket 12 acts in a direction that deforms (bulges) the side surface of the steel pipe 11 to which the beam bracket 12 is welded.

At this time, the steel pipe 1 near the welded part of the beam bracket 12
The side surface part 1 is connected to the adjacent fIlq surface part by a through bolt 14. Therefore, the tensile force is transmitted to other side surfaces of the steel pipe 11 via the through bolt 14, and as a result, the above-mentioned out-of-plane deformation can be prevented by dispersing the tensile force. That is, it is possible to prevent out-of-plane deformation of the side portion of the steel pipe and to perform appropriate stress transmission without requiring a large number of processing steps such as cutting the steel pipe 11 and welding the diaphragm (see Fig. 4 (D)). .

■A through bolt is inserted into the inside of the steel pipe 11, or this through bolt 14 does not hinder the filling of concrete 15;
Rather, the load transferability between the concrete 15 and the steel pipe 11 is further ensured. Therefore, a steel pipe-concrete composite column 10 with good vertical load transferability can be formed.

The concrete 15 is filled in at least the area where the through bolt 14 is inserted in the steel pipe 11, and hardened. Then, the concrete 15 is hardened in the area where the through bolt 14 is inserted.
■ Steel pipe 1 when fully tightening through bolt 14
1. Prevents out-of-plane deformation (indentation) inward, and ■
In the above process, the other side surface portion of the steel pipe 11 to which the tensile force is dispersed is prevented from being deformed inwardly out of plane (dentation).

(2) The force acting on the steel pipe 11 from the beam bracket 12 is directly transmitted from the welded portion between the two, and the force transmission between the beams is good.

■When joining the beams 21 on-site, a normal joint structure in which the beams 21 are joined to the beam brackets 12 using the joint pieces 22 can be adopted, and workability is good.

■Furthermore, when the beam brackets 12 are welded to both adjacent side surfaces of the steel pipe 11, the through bolts 14 inserted through the adjacent side surfaces do not pass through the center of the steel pipe. The insertion levels of the through bolts 14 inserted into each side surface of the steel pipe I1 can be arranged at the same level (within the same plane) in the longitudinal direction of the steel pipe I1. For this reason, ■ steel pipe 11
The finishing level of the through-bolt holes 13 to be provided on each side part of the steel pipe 11 becomes uniform, and the joint structure becomes simple. The distance from the welding part is the same between each through bolt 14, and due to the unevenness of the distance, a large moment is not exerted on any of the steel pipe side parts compared to the other side parts, and each side face part (1) The through-bolts 14 inserted into the through-bolt holes 13 provided on each side of the steel pipe 11 are not intertwined in a plane inside the steel pipe 11; steel pipe 11
Since the fluidity of the concrete 15 inside the container is not impaired, the concrete 15 can be completely filled. ■ By arranging the end edges of the washer-like plates 17 and 18 in a position close to the welded part of the beam bracket 12 to the side surface of the steel pipe 1l, the tensile force dispersion of the through bolt 14 described above can be achieved, and as a result, the steel pipe 11 The effect of suppressing out-of-plane deformation of the side surface portion can be more effectively exerted.

Note that the present invention may be applied to a square steel pipe having an arbitrary number of angles having a triangular cross section or more, as long as a beam bracket is welded to at least one side surface.

Further, in the present invention, the cross-sectional shape of the beam bracket can be made arbitrary, and is not limited to an H-shape, but may be a T-shape, a box-shape, or the like.

Furthermore, in the present invention, the through member does not necessarily need to be a bolt. The through member may be welded to the side surface of the steel pipe.

Furthermore, in the present invention, it is not necessary to provide a washer-like plate material between the through member and the side surface of the steel pipe.

[Effects of the Invention] As described above, according to the present invention, in a steel pipe column that can prevent out-of-plane deformation of the side portion of the steel pipe and allow filling of concrete inside the steel pipe, the joint configuration is simplified and the beam Good force transferability and workability can be achieved in one go.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
3 is a schematic diagram showing the construction process of the steel pipe column of the present invention, FIG. 4 is a schematic diagram showing the operation of the present invention, and FIG. 5 is a perspective view showing the conventional steel pipe column. Figure 6 is a sectional view showing another conventional steel pipe column, and Figure 7 is a sectional view showing a steel pipe column proposed by the applicant. 10...Steel pipe column, 11...Square steel pipe, 12...Beam bracket, 13...Through bolt hole, 14...Through bolt, 15...Concrete, 17, 18...Washer shape plate material.

Claims (2)

[Claims] (1) A side part to which a square steel pipe beam bracket is welded;
A hole for a through member is provided in the adjacent side surface of this side surface, a beam bracket is welded to a portion of the side surface of the steel pipe near the hole for the through member, and a hole is provided in the adjacent side surface of the steel pipe. With the through member inserted into the member hole temporarily fastened, at least the through member insertion area in the steel pipe is filled with concrete, and after the concrete hardens, the through member is permanently fastened to the adjacent side surface. A steel pipe column is constructed. (2) The steel pipe column according to claim 1, wherein the through member is a through bolt, and a washer-like plate is provided between a nut screwed onto the through bolt and a side surface of the steel pipe.