JPH0434151A - Steel pipe connecting method for structure - Google Patents

Abstract

PURPOSE:To facilitate the connecting work by fixing paired fitting joint plates having bolt through holes on protruding semi-long parts and fixed semi-long parts fixable to pipe ends to the pipe end circumferential surface of a steel pipe to connect, and bolting the pipe to a pipe to be connected. CONSTITUTION:To the circumferential surface of the pipe end la of a lower square steel pipe 1, a fitting joint plate 3a consisting of a fixed semi-long part 3a1 and a protruding semi-long part 3a2 protruding from the pipe end la is fixed. The lower square steel pipe 1 and the fitting joint plate 3a are mutually fixed by hexagon bolts 4, and the pipe end of an upper square steel pipe 2 having connecting bolt through holes is fitted to the fitting joint plate 3a. The upper square steel pipe 2 and the fitting joint plate 3a are fixed to each other by blind bolts or one-directional fastening bolts 5, and the lower square steel pipe 1 is connected to the upper square steel pipe 2 through the fitting joint plate 3a. The mechanical strength of the connecting part can be enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to steel pipes used for structural purposes in various industries;
In particular, it relates to a method for connecting structural steel pipes used in civil engineering, architecture, and marine structure fields.

[Conventional technology] Currently, square steel pipes, round steel pipes, and deformed steel pipes are used in large quantities in various industrial fields, especially in the fields of civil engineering, architecture, and marine structures, due to their excellent mechanical strength and high mechanical reliability. Various connection methods such as welding and bolting are commonly used to connect these steel pipes.

As is well known, with the development of automatic pipe end processing methods and welding methods for steel pipes, welding methods, including factory and on-site processing, have come to be widely used for interconnecting steel pipes.

[Problems to be Solved by the Invention] The welding method for connecting steel pipes for structures not only requires a skilled welder, but also requires particular on-site welding in terms of equipment, workability, and welded part inspection. There is a problem with increasing costs. These issues become especially noticeable when steel pipes have large diameters and thick walls, and work at heights or in harsh environments is required.

On the other hand, with connection methods such as bolting, it is difficult to structure the nodes, and it is necessary to prepare various types of reinforcing plates and reinforcing lips, as well as connection plates and pipes, in addition to pre-processing the pipe ends, and the connection method requires is a problem that requires a large number of human resources.

The objects of the present invention are that the processing of the pipe end is easy, the number of auxiliary parts for connection is small, the connection work is easy, the mechanical strength of the connection part is highly reliable, and it is extremely economical, especially in field work. Our objective is to provide a steel pipe connection method that can be expected to provide the following benefits.

[Means for Solving the Problems] The present invention has a set number of bolt through holes in the protruding half-length portion,
A plurality of pairs of fitting joint plates each having a fixed half-length portion that can be fixed to the pipe end are fixed to the circumferential surface of the pipe end of the connecting steel pipe at an appropriate interval, and the fitting joint plates are attached with the same parts as the connecting steel pipe. Fit the pipe end of the steel pipe to be connected, which has a diameter and has a connecting bolt through hole drilled at a position corresponding to the bolt through hole when the pipe ends are brought into contact, and then use a one-way tightening bolt to tighten the fitting. This is a method for connecting steel pipes for structures in which steel pipes to be connected are screwed together through joint plates. Square, round, or deformed steel pipes are used as the steel pipe, and the fitting joint plate is a combination of rectangular square plates, curved square plates, irregularly shaped square plates, and shaped steel, or rectangular square plates, curved square plates,
Selective combination members of irregularly shaped square plates and shaped steel can be used.

[Function] In the present invention, the connecting steel pipe has a pair of fittings having a set number of bolt through holes in the protruding half-length portion in advance on the circumferential surface of the end of the connecting steel pipe, and a fixed half-length portion that can be fixed to the tube end. A plurality of fitting joint plates are fixed to each other at appropriate intervals, and then a bolt is attached to the fitting joint plate at a position that has the same diameter as the connecting steel pipe and corresponds to the bolt through hole when the pipe ends are brought into contact. The pipe end of the steel pipe to be connected, which has a connection bolt through hole drilled in advance, is inserted, and then the steel pipe to be connected is screwed in via the fitting joint plate using a one-way tightening bolt, so the size of the steel pipe diameter and Regardless of the environment, it is possible to perform highly reliable connections in a short time with an extremely small number of people.Furthermore, the mating joint plates have large tolerances in size and strength design, and are arranged symmetrically. This facilitates processing at the factory and on-site.

Furthermore, in the method of the present invention, there is less need to worry about connection work regarding steel pipes, so square, round, or deformed steel pipes can be freely selected and used depending on the purpose, making it possible to design the structure most economically.

In addition, in the method of the present invention, a rectangular square plate is used as the fitting joint plate,
Because it is possible to freely use combinations of curved square plates, irregularly shaped square plates, and shaped steel, or selected combinations of rectangular square plates, curved square plates, irregularly shaped square plates, and shaped steel, depending on the purpose8,
In addition to being able to select the most efficient and safe design in terms of mechanical strength and workability, it is also possible to construct structures with excellent reliability.

[Example] Fig. 1 is a schematic partial front view showing a situation in which a connecting steel pipe 1 and a connected steel pipe 2 are connected as pillar materials of a structure, for example, a building, in the present invention. is a square steel pipe located at the bottom near the ground, and the connected steel pipe 2 is a square steel pipe located at the top. Therefore, the connecting steel pipe is hereinafter referred to as the lower square steel pipe, and the connected steel pipe is referred to as the upper square steel pipe.

Fitting joint plates 3a to 3 are provided on the circumferential surface of the tube end 1a of the lower square steel pipe 1.
d is fixed. However, the fitting joint plate 3d is not shown in the figure because it is on the back side of the fitting joint plate 3a. This configuration is the same as that of the fitting joint plates 3b to 3d. Next, the member represented by the reference numeral 4 is a hexagonal bolt that fixes the lower square steel pipe 1 and the fitting joint plate 3a,
Further, the member represented by the reference numeral 5 is a blind bolt, that is, a one-way wire bolt, which fixes the upper square steel pipe 2 and the fitting joint plate 3a, but the hexagonal bolt 4 and the one-way tightening bolt are also used for the fitting joint plates 3b to 3d. 5 fixes the lower square steel pipe 1 and the upper square steel pipe 2, so the lower square steel pipe 1 and the upper square steel pipe 2 are firmly connected to each other via the fitting joint plates 3a to 3d.

FIG. 2 is a partially detailed view showing the fitting joint plates 3a to 3c (description of 3d is omitted) fixed to the circumferential surface of the tube end 1a of the lower square steel pipe 1 before connection. Projecting half length part 3
A set number of bolt through holes, represented by reference numeral 6, are drilled in az, and the protruding half-length portions 3b of the fitting joint plates 3b and 3C are drilled.
2.3C2 also has a similar bolt through hole.

The joint plate members indicated by symbols 3b, 3cs are fitting joint plates 3b.
, 3c, and has substantially the same configuration as the above-mentioned fitting joint plates 3b and 3C, and is attached to the inside of the lower square steel pipe 1 via a hexagonal bolt 4. The joint plates 3b and 3C are positioned to directly face each other. This structure is the same for the fitting joint plates 3a. In other words, the fitting joint plates 3a to 3C are each composed of two joint plates having substantially the same configuration as the main members, and the fitting joint plates 3b and 3C are Gaps 7a and 7 between the two members, respectively.
b constitutes a gap into which the tube end of the upper square steel tube 2 can fit. In other words, from the point of view of connecting steel pipes, it is possible to connect steel pipes even if each joint plate is composed of one piece, but in order to obtain a large joint strength, a large number of members are required. As will be explained in detail later, reference numerals 38 to 3
A two-piece structural member indicated by d is used, and this is defined as a fitting joint plate.

FIG. 3 is a schematic explanatory diagram showing the state immediately before the upper square steel pipe 2 is fitted into the lower square steel pipe 1, and the upper square steel pipe 2 is inserted into the fitting joint plates 3a to 3C of the lower square steel pipe 1 When the end face 2a of the upper square steel pipe 2 abuts the end face 1b of the lower square steel pipe l,
A set number of bolt through holes 8 communicating with the bolt through holes 6 of the fitting joint plate 3a are drilled in advance. Therefore, with the lower square steel pipe 1 and the upper square steel pipe 2 in contact with each other, the bolt through hole 6
By inserting the one-way wire bolt 5 into and 8 from outside the pipe and tightening it, the steel pipe connection as shown in FIG. 1 can be made accurately and quickly.

Regarding the one-way tightening bolt 5, as shown in the schematic side view in Fig. 4 and the schematic cross-sectional view in Fig. 5, there are blind bolts that can be tightened only from one side or from the outside. Use a zipper.

The steel pipes may not come into close contact with each other due to various reasons, such as morphological distortions caused by metallurgy, processing or transportation, or cracks or unevenness at the pipe end during cutting, between the lower square copper pipe 1 and the upper square steel pipe 2. Therefore, in the present invention, a gap of about 5 to 10 mm is often created. Therefore, in the present invention, the pipe ends are brought into close contact, are in partial contact, or are butted together with a gap of about 5 to loI 1 m, etc. It is said that both are brought into contact.

Therefore, when drilling the bolt through hole and the connecting bolt through hole, the positional relationship is determined in consideration of the abutting state, but the gaps may be set in advance at regular intervals of, for example, 10 mm.

In FIGS. 4 and 5, the one-way tightening bolt 5 is composed of a bottle 9 and a pressing sleeve 10 that is slidably inserted into the bottle 9 as main members. 611 is a pinch wheel of the bottle 9, and 12 is the head of bottle 9, 13 is the pressing sleeve 1
It is the bottom of 0.

As shown in FIG. 4, the head 12 of the bottle 9 and the tip of the pressing knob 10 are tightened through the through holes 1 of the steel materials 14a and 14b.
5, the pinch wheel 11 is tightened by engaging a tool (not shown), pulling the bottle 9 in the pulling direction, pressing the bottom 13 of the pressing sleeve 10 in the opposite direction, and tightening from the periphery. As shown in the figure, the tip of the head 12 presses the tip of the pressing sleeve 10 to form a bulging portion 10a, and the bottom of the pressing sleeve 10 bites into the lock groove 16 of the bottle 9, and when a predetermined axial force is reached. The pinch coil 11 is broken and the tightening is completed.

6 is a schematic sectional view taken along the line AA in FIG. 1, and FIG. 7 is a schematic sectional view taken along the line BB in FIG.
-3d each have joint plate members 3ai to 3d3, and are configured as if to form a pair with the members, and in the present invention, this configuration is defined as a pair of fitting joint plates. In addition, the fixed half-length portions 3a+~ of the fitting joint plates 3a~3d
3d is fixed with a hexagonal bolt 4, and the protruding half-length portion 3az~
3dz is fixed with one-way wire bolt 5, but the 8th
As shown in the schematic perspective view of the figure, for example, the fixed half-length portion 3a+
, 3b, are fixed with one-way tightening bolts 5, and fixing means by welding may be adopted.Which fixing means is adopted depends on the type of steel pipe, the dimensions and form of the fitting joint plate, or workability. Therefore, the protruding half-length portions 3b, 3ci, the joint plate members 3b, .
Each end of 3cs 3b4.3C4, 3bs, 3
Ca is chamfered so as to face each other, or as shown in the schematic partial front view of FIG.
If the protruding half-length portions 3b, 3c4 are made longer than the end portions 3b, 3c4 and function as guides when the upper square steel pipe 2 is inserted, workability will be improved. Protruding half length part 3az
, 3da and the ends of the joint plate members 3aa, 3di are also sloped chamfered in the same manner, but the explanation will be omitted.

FIG. 11 is a schematic front view of the upper square steel pipe 2, in which the upper square steel pipe 2 has fitting joint plates 3e, 3f, 3g made of rectangular square plates at the upper end.
3h (3h is not shown), and has a bolt through hole 8 at the lower end. In this way, with the present invention, it is possible to fix the fitting joint plate to the steel pipe in advance and provide bolt through holes in the factory, and to connect the steel pipe with only one-way wire bolts at the site. Workability is very good.

FIG. 12 shows a fitting joint plate 3h made of a curved square plate having a curvature matching the curvature of the round steel pipe IC at the upper end of the round steel pipe IC;
31.3J is a partially schematic perspective view of an embodiment in which a 31.3J is fixed. As the fitting joint plate, in addition to the rectangular square plate and the curved square plate, there is also a fitting joint plate 3 made of an irregularly shaped square plate having ribs 17 for connection with other members as shown in the perspective view of FIG. It is also possible to employ members such as.

Furthermore, as shown in the schematic cross-sectional views of FIGS. 14 and 15, a fitting joint plate 3 made of a combination of CT section steel and a rectangular square plate
1 or a 3m fitting joint plate made of a combination of channel steel and rectangular square plate
In addition, although not shown, in addition to using angle iron or lip channel steel individually as a pair, it is also possible to construct a fitting joint plate by appropriately combining rectangular square plates and irregularly shaped square plates. If the shape of the fitting joint plate is too complicated or the plate is too rigid, the adhesion between the parts will be poor, making connection difficult. Increasing the processing accuracy of the joint plate itself will affect economic efficiency, so it is desirable to select the type and form of the joint plate in consideration of overall efficiency.

FIG. 16 is a schematic perspective view showing an example in which the lower square steel pipe 1 and the upper square steel pipe 2 are connected at a portion 1 to 2 m above the connection points with the beams 18a and 18b in the present invention. The present invention is not limited to the connection of such steel pipes for columns, but can also be used to connect steel pipes used for beams and other members, such as braces. say. Further, in the present invention, in addition to the above-mentioned square and round steel pipes, it is also possible to target irregularly shaped steel pipes such as triangular and hexagonal steel pipes.

[Effects of the Invention] According to the method of the present invention, when connecting steel pipes, there is no need for special pipe end processing with high precision, and an appropriate number of fitting joint plates are fixed to the circumferential surface of the pipe ends of the steel pipes in advance. Simply insert the end of the steel pipe to be connected, which has a through-hole for the connection bolt, into the fitting joint plate, and then tighten the one-way bolt, regardless of the size or shape of the steel pipe. A highly reliable connection is possible. Moreover, the number of auxiliary parts for connection is extremely small, and in addition to the great advantages of not requiring skilled workers, the mechanical strength of the connection is highly reliable, and it is suitable for the working environment, especially in field work. Since it can be carried out without any influence, it is extremely economical and has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic partial front view showing the situation in which the connecting steel pipe and the connected steel pipe are connected in the present invention, Fig. 2 is a partial detailed view showing the fitting joint plate used in the present invention, and Fig. 3 is a partial front view showing the situation in which the connecting steel pipe and the connected steel pipe are connected. A schematic explanatory diagram showing the state immediately before inserting the upper square steel pipe, Figures 4 and 5 are schematic side views of the one-way wire bolt and a schematic sectional view of the state of tightening, Figures 6 and 7 are the Figure 1 is a schematic cross-sectional view from A-A and B-B in Figure 1, Figure 8 is a schematic perspective view showing an example of fixation of the fitting joint plate, Figures 9 and 10 are fitting joints with chamfered ends. Figure 11 is a schematic front view of a top square steel pipe; Figure 12 is a partial perspective view of a fitting joint plate made of a curved square plate fixed to the upper end of a round steel pipe; Figure 13 is a variant A perspective view of a fitting joint plate made of a square plate, Figures 14 and 15 are schematic cross-sectional views showing examples of fitting joint plates, and Figure 16 is a schematic perspective view showing a connection between a lower square steel pipe and an upper square steel pipe. It is a diagram. 1... Lower square steel pipe, 1a... Pipe end, 1b... End surface,
lc...Round steel pipe, 2...Top square steel pipe, 2a...End face, 3a~3m=-fitting joint plate, 3a+, 3b+
, 3c+, 3 d, -...Fixed half length part, 3ai, 3h
a, 3c2.3dx'' protruding half length part, 3as, 3b,,
3cx, 3ds...joint plate member, 3b4.3C4,3
b,, 3cs one end, 4... hexagonal bolt, 5... one-way tightening bolt, 6... bolt through hole, 7a, 7b.
...Gap, 8-...Bolt through hole, 9...Bin, 10
... Suppression sleeve, 11... Pinch coil, 12...
・Head, 13... Bottom, 14a, 14b... Steel material to be tightened, 15... Through hole, 16... Lock groove, 17... Connection rib, 18a, 18b... Beam .

Claims (3)

[Claims] (1) A plurality of pairs of fitting joint plates each having a set number of bolt through-holes in the protruding half-length part and a fixed half-length part that can be fixed to the pipe end are connected at appropriate intervals to the pipe end of the steel pipe. A cover that is fixed to the circumferential surface and has a connecting bolt through hole drilled in the fitting joint plate, which has the same diameter as the connecting steel pipe, and at a position corresponding to the bolt through hole when the pipe ends are brought into contact. A method for connecting steel pipes for structures, in which the ends of the connecting steel pipes are fitted, and then the steel pipes to be connected are screwed together via the fitting joint plate using a one-way tightening bolt. (2) Claim 1 in which the steel pipe is a square, round, or deformed steel pipe.
The method for connecting steel pipes for structures described above. (3) As a fitting joint plate, a combination of rectangular square plates, curved square plates, irregularly shaped square plates, and shaped steel, or rectangular square plates, curved square plates,
2. The method for connecting steel pipes for structures according to claim 1, wherein selected combination members of irregularly shaped square plates and shaped steel are used.