JPH0444669Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to the joint structure of steel materials for cofferdams.
In particular, the present invention relates to a joint structure that can reduce penetration resistance such as friction between steel materials when penetrating steel materials into the ground.

<Conventional Technology> As is well known, in foundation work for bridge piers, etc., cofferdams are constructed above the water surface and construction is carried out with the water inside the coffers excluded.As a type of cofferdam, There is a method of construction by sequentially connecting steel materials such as steel pipes or H-shaped steel.

In the steel materials used for such cofferdams, joints that are engaged with each other are usually fixedly installed in each steel material in advance, an example of which is shown in Japanese Patent Publication No. 59-44462, for example.

In the joint structure disclosed in the above publication, annular steel pipe sheet piles are used as the steel material, and a box-shaped joint having a slit-shaped opening is fixed on the side surface of one of the steel pipe sheet piles that are interconnected. A T-shaped joint that is inserted into the box-shaped joint through the opening is fixed on the side surface of the other steel pipe sheet pile,
When the steel pipe sheet pile is penetrated into the ground, these joints are engaged with each other when it is driven.

However, such a joint structure has the following problems.

[Problem that the invention aims to solve] In other words, when driving steel pipe sheet piles, a guide such as an H-shaped steel is installed in order to drive the sheet piles along a set line, and the driving is done along this guide. However, since the steel pipe sheet pile is quite long, it tilts forward, backward, left and right in the longitudinal direction.At this time, the joint provided on the steel pipe sheet pile is a box-shaped joint and a T-shaped joint that engages with it, so it is perpendicular to the connection direction. The inclination of the T-shaped joint is regulated by contacting the inner surface of the box-shaped joint.

However, since there is no means to restrict the movement of the T-shaped joint in the connection direction, it moves until it comes into contact with the outer surface of the steel pipe sheet pile, and in this state, the steel pipe sheet pile is installed obliquely in the connection direction. Therefore, there was a problem that the penetration resistance of the steel pipe sheet piles increased.

This idea was made in view of the conventional problems, and its purpose is to create a structure for cofferdam construction that can reduce as much as possible the penetration resistance of steel materials that are cast into the ground. Our objective is to provide joint structures for steel materials.

<<Means for solving the problem>> In order to achieve the above object, this invention uses H-shaped steel, I-shaped steel, which are interconnected and penetrated into the ground.
In a joint structure for steel materials such as steel pipes, there is a box-shaped joint that is fixed on the outer surface of one of the mutually connected steel materials and has a slit-shaped opening, and a box-shaped joint that is fixed on the outer surface of the other steel material and has a slit-like opening. and a T-shaped joint inserted into the box-shaped joint, and an annular or annular joint fixed to either the T-shaped joint or the outer surface of the one steel material and disposed close to the other outer surface of these members. It consists of a protruding interposition material.

<<Operation>> According to the joint structure having the above configuration, either the T-shaped joint or the outer surface of one of the steel members is provided with an annular or protruding interposition member disposed close to the outer surface of the other of these members. Therefore, the interposition material restricts the movement of the T-shaped joint in the connection direction, thereby reducing the penetration resistance of the steel material.

Further, since the interposer is annular or protruding, the contact area is small, and frictional resistance can be reduced.

<<Example>> Hereinafter, preferred embodiments of this invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a joint structure for cofferdam steel materials according to this invention.

The joint structure shown in the figure is an application of this idea to a steel material made of H-shaped steel.
The shaped steels are connected to each other via joints 10 and are driven into the ground.

The structure of the joint part 10 includes a box-shaped joint 14 fixed to the outer surface of a flange 12 of one H-shaped steel A that is interconnected, and a T-shaped joint 14 fixed to the outer surface of a flange 16 of the other H-shaped steel B. It is generally composed of a figure-shaped joint 18.

The box-shaped and T-shaped joints 14, 16 extend along the longitudinal direction of the H-beams A, B over their entire lengths.

The box-shaped joint 14 includes a pair of angle members 20,
20, angle members 20, 20 are placed at a predetermined interval, and one end thereof is connected to a flange 1, respectively.
2 to define a joint space 22 with a rectangular cross section, and a slit-shaped opening 24 is provided on the central axis of the flange 12 in the width direction.

A hollow pipe-shaped interpolation material 26 is fixed on the outer surface of the T-shaped joint 18 over its entire length on its central axis, and this interpolation material 26 allows the T-shaped joint 18 to pass through the opening 24. When inserted into the joint space 22 of the box-shaped joint 14, it is placed close to and facing the flange 16 of the H-shaped steel A.

Now, in the joint structure configured as described above, the H-shaped steel A, which has already penetrated into the ground, is
When connecting and pouring the shaped steel B, the T-shaped joint 18 is inserted into the opening 2 in the joint space 22 of the box-shaped joint 14.
4, a pipe-shaped interpolation material 26 is provided on the outer surface of the T-shaped joint 18 and is placed close to the flange 16 of the H-shaped steel A to be connected. Shaped joint 1
8 is restricted from moving in the connection direction, and as a result, H
The penetrating direction of the shaped steel B is prevented from being obliquely inclined with respect to the connection direction, and the penetrating resistance is reduced.

In addition, since the interpolation material 26 is pipe-shaped, the H-shaped steel A
The area in contact with the flange 14 is a line contact,
Since the contact area becomes smaller, frictional resistance can also be reduced.

In the joint structure shown in this embodiment, after the H-shaped steels A, B... are penetrated into the ground, mortar or the like is injected into the joint space 22 to form the joint part 10.
Pipe-shaped interpolation material 2 is used to ensure water-tightness.
If a through hole is bored in 6, this can also be used as a mortar injection pipe.

Figure 2 shows a second embodiment of this invention.
Only the characteristic points will be explained below.

In the embodiment shown in the figure, instead of the pipe-shaped interposer 26 fixed to the outer surface of the T-shaped joint 18,
Two protruding interposition members 26a are fixed along the longitudinal direction of the T-shaped joint 18.

With the joint structure constructed in this way, the penetration resistance of the H-shaped steel B can be reduced as in the above embodiment.

Figure 3 shows a third embodiment of this invention.
Only the characteristic points will be explained below.

In the embodiment shown in the figure, a pipe-shaped interposition member 26 is fixed to the T-shaped joint 18 as in the first embodiment, and the box-shaped joint 14 is provided on the inner side facing the T-shaped joint 18, respectively. Two protruding intervening members 26a are fixedly provided.

With the joint portion 10 configured as described above, the same effects as in the above embodiment can be obtained.

In addition, in the above embodiment, H-type steels A and B were exemplified as the steel materials that are interconnected and penetrated into the ground, but the steel material to which this invention is applied may also be steel pipe sheet piles.

Further, the pipe-shaped or protruding interposition members 26, 26a shown in the above embodiments may be attached to the steel material side on which the box-shaped joint 14 is fixed.

<<Effects of the invention>> As explained in the examples above, according to the joint structure for steel materials for cofferdams according to this invention, penetration resistance can be significantly reduced, making construction easier especially on hard ground, and making it easier to use steel materials. can be placed accurately on the set line.

[Brief explanation of the drawing]

FIG. 1 is a top view showing a first embodiment of a joint structure according to the present invention, FIG. 2 is a top view showing a second embodiment, and FIG. 3 is a top view showing a third embodiment. 10...Joint part, 12...Flange, 14...
Box-shaped joint, 16...Flange, 18...T-shaped joint, 20...Angle material, 22...Joint space, 2
4...opening, 26...intermediate material.

Claims (1)

[Scope of utility model registration request] H-shaped steel, I, interconnected and penetrated into the ground
In a joint structure for steel materials such as shaped steel and steel pipes, there is a box-shaped joint that is fixed to the outer surface of one of the mutually connected steel materials and has a slit-shaped opening, and a box-shaped joint that is fixed to the outer surface of the other steel material and has the opening. a T-shaped joint that is inserted into the box-shaped joint through the box-shaped joint, and is fixed to either the T-shaped joint or the outer surface of the one steel material, and is disposed close to the outer surface of the other of these members. A joint structure for steel materials for cofferdam work, characterized by comprising an annular or protruding interposition member.