JPH07207771A - Steel pipe joining structure - Google Patents

Abstract

PURPOSE:To facilitate joining, heighten the rigidity and tension-compression bearing force, and improve joining performance and reliability together with workability by fitting a joining end part having slits of a steel pipe to a solid steel bar or a connecting steel bar, and uniformly and strongly fastening them over the whole circumferential surface by a cylindrical fastening metal fitting. CONSTITUTION:In a joining structure for a steel pipe 1 and a steel bar 2 of frame structural materials in a building, a joining end part 1a of the steel pipe is divided into plural parts by shaft directional slits 4, and the joining end part of the steel pipe is fitted to an end part of the steel bar 2, and a cylindrical fastening metal fitting 5 is fitted to the joining end part of the steel pipe, and is fastened by plural bolts 6, and the joining end part of the steel pipe is brought into close contact with and frictionally joined to the end part of the steel bar 2 almost over a circumferential surface by uniform and strong fastening force. In a joining structure for mutual steel pipes of frame structural materials in a building, joining end parts of the steel pipes are divided into plural parts by shaft directional slits 4, and both joining end parts of the steel pipes are fitted and connected to both sides of a connecting steel bar 3, and a cylindrical fastening metal fitting 15 is fitted between both joining end parts of the steel pipes, and are fastened by plural bolts 6, and the joining end parts of the steel pipes are frictionally joined to both sides of the connecting steel bar 3 over the whole circumferential surface by uniform and strong fastening force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of steel pipes suitable for joining steel pipes and steel rods of frame structural materials in various structures and joining steel pipes to each other.

[0002]

2. Description of the Related Art Conventionally, in the construction of various structures, when joining steel pipes, which are frame structural materials, at the time of site construction, welding by welding has been a troublesome work, and in various structures and temporary buildings, etc. In many cases, they are connected and constructed by a joint as shown in FIG. That is, as shown in FIG. 5 (A), a tensile bolt joint (flange joint) for connecting the flanges b provided at the ends of the steel pipe a to each other with a plurality of bolts / nuts c, or as shown in FIG. 5 (B). A pair of pipe halves d are fitted between both joint ends of the steel pipe a, and the pair of pipe halves d and the steel pipe a are tightened with a plurality of bolts and nuts e to form a shear bolt joint. They are joined together.

[0003]

In the conventional steel pipe joint structure, the tensile bolt joint cannot be selected because the joint position of the steel pipe is limited to the flange portion at the end, and tensile loads are applied by a plurality of bolts. Therefore, the tensile strength is limited.
Further, the shear bolt joint described above has a problem in terms of joint strength such as a gap between a plurality of bolt holes and backlash, which causes play, and the rigidity and tightening force of the joint part are limited and lack reliability. There are issues such as.

The present invention was developed in order to solve the above problems, and the object thereof is to provide a solid steel rod or a connecting steel rod with a slitted joint end portion of a steel pipe. The joint structure of steel pipes that fits together and is evenly and strongly tightened over the entire surface with a tubular fastening fitting, facilitating the joining, and increasing its rigidity and tensile / compression strength to improve the workability as well as the joining performance and reliability. To provide.

[0005]

According to the present invention, in a joint structure of a steel pipe and a steel rod of a frame structure material in a building, the joint end portion of the steel pipe is divided into a plurality of slits in the axial direction,
Fit the joining end of this steel pipe to the end of the steel rod, fit the tubular fastening metal fitting to the joining end of the steel pipe, and tighten with multiple bolts to join the steel pipe to the end of the steel rod. The ends are closely and evenly tightened over the entire circumference by frictional joining, or the joint ends of the steel pipe are divided into multiple slits in the axial direction, and the joint ends of this steel pipe are connected. Fit on both sides of the steel rod and connect,
Cylinder-shaped tightening metal fittings are fitted between both joint ends of the steel pipe and tightened with multiple bolts, and both joint ends of the steel pipe are evenly and strongly tightened on both sides of the connecting steel rod over the entire circumferential surface. By closely contacting with force and friction-joining, it is possible to easily and accurately join at the construction site. Cylinder-shaped tightening is achieved by fitting the joint end with slit of the steel pipe to the solid steel rod or the connecting steel rod. The metal fittings are evenly and strongly tightened over the entire surface, effectively increasing the joint rigidity and tensile / compression strength.

[0006]

[Operation] The joint end of the steel pipe of the frame structure in the building is divided into a plurality of slits in the axial direction, and the joint end of the steel pipe is divided into the ends of the steel rod of the frame structure or both sides of the connecting steel rod. , And by fitting a tubular tightening metal fitting between the joint ends of the steel pipe or both joint ends and tightening with multiple bolts, it is easy and accurate at the construction site with no particular variations. The joint ends of the steel pipes that are well joined and fitted to the solid steel rods or the connecting steel rods are evenly and strongly tightened over the entire surface with the tubular fastening fittings. The joint ends are closely and frictionally welded over the entire circumference of a solid steel rod or a connecting steel rod with a uniform and strong tightening force, making it easy as a friction joint with excellent joint rigidity and tensile / compression strength. To be joined to.

[0007]

1 (A) and 1 (B) show a first embodiment of the present invention, FIGS. 1 (C) and 1 (D) show a second embodiment, and FIGS. 2 and 3 show the usage of the first embodiment. 4 shows a usage mode of the second embodiment. In the figure, 1 is a steel pipe of a frame structure material in various constructions, 2 is a steel rod of the same frame structure material, 3 is a connecting steel rod fitted to both joint ends 1a of the steel pipe, and 4 is a joint end portion 1a of the steel pipe. The axial slits are arranged at circumferential intervals, and 5, 5 and 15 are joint ends 1a of the steel pipe or tubular fittings 5a and 15a, which are fitted between the joint ends 1a and are expandable and contractible. Tightening hardware 5,15
The tightening portions formed on one side of the shaft, 6 and 7 are bolts and nuts which are inserted into the tightening portions and tightened. The first embodiment shown in FIGS. 1 (A) and 1 (B) is a frame structure in a structure. Material steel pipe 1
In the joint structure of the steel pipe 2 and the steel rod 2, the joint end portion 1a of the steel pipe 1
Is divided into a plurality of slits 4 in the axial direction, the joint end 1a of the steel pipe 1 is fitted to the end of the steel rod 2, and the joint end 1 of the steel pipe 1 is
A tubular fastening member 5 is fitted to a and tightened with a plurality of bolts 6, and the joining end portion 1a of the steel pipe 1 is closely attached to the end portion of the steel rod 2 over the entire circumferential surface with a uniform and strong tightening force. Then, it has a joint structure of steel pipes that are friction-joined.

In the second embodiment shown in FIGS. 1C and 1D, in the joint structure of the steel pipes 1 in the frame member of the structure, the joint end portion 1a of the steel pipe 1 is formed into a plurality of slits 4 in the axial direction. Divide the joint end 1a of the steel pipe 1 into the connecting steel rod 3
On both sides of the steel pipe 1 to be connected by fitting a tubular fastening member 15 between both joint ends 1a of the steel pipe 1 and tightening with a plurality of bolts 6. The joint structure of the steel pipe is such that both joint ends 1a are closely and frictionally joined to each other with a uniform and strong tightening force over the entire peripheral surface.

More specifically, the steel pipe 1 is a skeleton structural material in various constructions, and as shown in FIG. 1, a plurality of slits 4 are axially oriented at the joint end 1a of the joint. (The slits are arranged in a cross shape in the illustrated example), the joint end portion 1a is divided so that the diameter can be expanded and contracted, and the joint end portion 1a can be easily attached to the end portion of the steel rod 2 of the frame structure by the expansion and contraction diameter. It can be fitted to. It should be noted that the slits 4 are appropriately increased / decreased according to the diameter of the steel pipe 1, and in the case of a steel pipe 1 having a relatively large diameter, the number of slits 4 can be increased to facilitate tightening. Further, the tightening fitting 5 is provided with a pair of tightening portions 5a on one side thereof and has a tubular shape capable of being tightened by its expansion / contraction diameter, and substantially the entire length of the joining end portion 1a of the steel pipe 1,
The entire surface is fitted, and a plurality of (two in the illustrated example) bolts 6 are fitted into the tightening portion 5a and tightened with a nut 7. Further, the connecting steel rod 3 (second embodiment) has a cross-sectional shape corresponding to the internal shape of the joining end portion 1a of the steel pipe 1, and a length at which the joining end portions 1a of the steel pipe 1 are fitted on both sides thereof. Is forming. Tightening fitting 15 (second
In the embodiment, compared with the fastening fitting 5 of the first embodiment, the steel pipe 1 is formed to have a longer length in correspondence with both joint ends 1a and 1a, and the bolt 6
The structure is characterized by increasing the number of
Basically, the configuration is similar.

In the first embodiment, as shown in FIGS. 1A and 1B, the steel pipe 1 and the steel rod 2 of the frame structure material in the structure.
And a structure for joining the steel pipe 1 with a plurality of slits 4 at the joint end 1a of the steel pipe 1 at the construction site for the assembly and construction of the steel pipe 1. The joining end portion 1a is fitted to the end portion of the steel rod 2, and the fastening metal fitting 5 is fitted to the joining end portion 1a so that a plurality of fitting ends (2 in the illustrated example are shown.
Bolts and nuts 6 and 7), and the joint end portion 1a with the slit 4 of the steel pipe 1 is uniformly reduced over almost the entire surface by the tightening metal fitting 5 so that the peripheral surface of the end portion of the steel rod 2 is reduced. Tighten tightly and bond to. That is, the joint end portion 1a of the steel pipe 1 is fitted to the peripheral surface of the end portion of the solid steel rod 2 by the tightening metal fitting 5 over substantially the entire length and the entire surface thereof with even and strong tightening force, and they are brought into close contact and friction bonded. However, it is easily and accurately joined as a pressure-bonded friction joint having excellent joining rigidity and tensile / compression proof strength.

For example, as shown in FIG. 2, when joining a connecting material (steel pipe) 21 to a main material (steel pipe) 11 of a frame structure material in a building, a steel rod 22 is inserted into the main material 11 and this steel is used. The joining end portion 21a of the connecting member 21 is joined to the end portion of the rod 22, or the main material (steel pipe) 31 of the frame structure material and the joining ring metal fitting 33 are joined in a single-layer lattice dome as shown in FIG. In this case, it is suitable to join the end portion of the connecting steel rod 32 to the joint end portion 31a of the main material 31 (3 in the figure).
4 is a connecting bolt), which is a relatively simple process of arranging the slit 4 at the joint end of the steel pipe as described above,
Even at the construction site, there is no particular variation in construction, and the joints are accurately and easily and efficiently joined, and the joint rigidity and tensile / compression proof strength required for the frame structure material are secured, and disassembly and disassembly are easily performed. Suitable for joining various types of simple structures and frame structural materials in temporary buildings.

The second embodiment is shown in FIG. 1 (C).
As shown in (D), the steel pipe 1 of the frame structure material in the structure
Mutual joining structures, for example, when assembling and constructing the same, at the construction site, a plurality of slits 4 are arranged at the joining end 1a of the steel pipe 1 to divide it so that it can be expanded / contracted, and the joining end with this slit 4 is formed. 1a is fitted and connected to both sides of the connecting steel rod 3,
Tightening metal fittings 15 are fitted between the joint ends 1a and tightened with a plurality of (three in the illustrated example) bolts and nuts 6, 7.
By means of the fastening fitting 15, the joint end portion 1a with the slit 4 of the steel pipe 1 is evenly reduced over substantially the entire length and the entire surface, and is strongly tightened and fitted on the peripheral surface of the end portion of the steel rod 2. That is, the joining end portion 1a of the steel pipe 1 is fitted to the both circumferential surfaces of the solid connecting steel rod 3 by the tightening metal fitting 15 over substantially the entire length and the entire surface with a uniform and strong tightening force, and they are brought into close contact with each other to cause friction. The frictional joints are joined to each other easily and accurately as a pressure-bonded friction joint having excellent joining rigidity and tensile / compression proof strength.

For example, as shown in FIG. 4, both joint ends of an upper chord member (steel pipe) or a lower chord member (steel pipe) 41 of a lattice beam or a lattice column of a frame structure material in a building are joined, or a diagonal member thereof. It is suitable for joining both joint ends of the (steel pipe) 51, and by the relatively simple processing of arranging the slit 4 at the joint end portion of the steel pipe as described above, a special construction can be performed even at the construction site. It is possible to obtain basically the same actions and effects as those of the first embodiment, such as accurate and easy and efficient joining without variation of the above, and securing the joining rigidity and tensile / compression proof strength required for the frame structure material. To be

[0014]

As described above, the present invention divides the joint end portion of the steel pipe of the frame structure material in the building into a plurality of slits in the axial direction and divides the joint end portion of the steel pipe into the steel rod of the frame structure material. By fitting the ends of the steel pipe or both sides of the connecting steel rod, fitting a tubular fastening metal fitting between the joint ends of the steel pipe or both joint ends, and tightening with multiple bolts. It does not require welding work even in the field, it is easily and accurately joined without any variation, and the joint end of the steel pipe fitted to a solid steel rod or a connecting steel rod has a tubular fastening fitting. Is evenly and strongly tightened over the entire surface, and the joint end of this steel pipe is closely and frictionally welded over the entire peripheral surface of the solid steel rod or the connecting steel rod with even and strong tightening force. It is easily joined and its rigidity and tensile / compression proof strength are effectively improved, and joint performance and reliability are improved along with workability. It is.

[Brief description of drawings]

FIG. 1 is a side view (A) and X- showing a first embodiment of the present invention.
X sectional view (B) and side view of the second embodiment (C) and YY
Sectional view (D)

FIG. 2 is a plan view showing a mode of use of the first embodiment.

FIG. 3 is a plan view (A) showing another usage mode of the first embodiment.
And ZZ cross section (B)

FIG. 4 is a side view showing a mode of use of the second embodiment.

FIG. 5 is a side view (A) showing a conventional example and a side view (B) showing another conventional example.

[Explanation of symbols]

 1 Steel pipe 1a Joint end (steel pipe) 2 Steel rod 3 Steel rod for connection 4 Slit 5,15 Tightening fitting 6 Bolt

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yuki Aoki 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Katsuya Ogura 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd.

Claims (2)

[Claims] 1. In a joint structure between a steel pipe and a steel rod of a frame structure material in a structure, the joint end of the steel pipe is divided into a plurality of slits in the axial direction, and the joint end of the steel pipe is divided into ends of the steel rod. Part of the steel pipe, and a tubular fastening metal fitting is fitted to the joint end of the steel pipe and tightened with multiple bolts, and the joint end of the steel pipe is evenly and strongly applied to the end of the steel rod over the entire circumference. A steel pipe joint structure characterized in that they are closely joined and frictionally joined together with various tightening forces. 2. In a joint structure of steel pipes of a frame structure material in a structure, a joint end portion of the steel pipe is divided into a plurality of slits in an axial direction, and the joint end portions of the steel pipe are arranged on both sides of a connecting steel rod. Fit and connect, fit a tubular clamp between both joint ends of the steel pipe, and tighten with multiple bolts.Enclose both joint ends of the steel pipe around both sides of the connecting steel rod. A steel pipe joint structure characterized in that it is closely and frictionally joined with a uniform and strong tightening force across the surface.