JPH0444670Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a water-stopping structure for joints of steel materials for cofferdams, and in particular, to prevent hardening water-stopping materials from leaking out from the joints. Regarding water-stop structure.

<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.

Once a cofferdam of a predetermined length has been constructed, a hardening water-stopping material such as mortar is injected into the joint to ensure the water-stopping properties of the cofferdam. , I had the problem explained below.

《Problem that the invention aims to solve》 In other words, when driving steel pipe sheet piles, in order to drive them along a set line, a guide such as an H-shaped steel is set and the driving is done along this guide. However, since the joint structure is a T-shaped joint that is inserted into the inside of the box-shaped joint through the opening, it is difficult to cast unless a certain amount of space is provided between the opening and the T-shaped joint. become.

However, when such a gap is provided, there is a problem in that the water stop material injected into the joint leaks to the outside through the gap.

This idea was created in view of these conventional problems, and its purpose is to create a steel joint for cofferdams that can significantly reduce the leakage of the water-stopping material injected into the joint. The objective is to provide a water-stop structure.

<Means for Solving the Problems> In order to achieve the above object, this invention involves penetrating into the ground by connecting them through joints, and injecting a hardening water stop material into the joints. In water-stopping structures for steel materials such as H-type steel, I-type steel, and steel pipes, one end of a pair of L-shaped angle members is fixed at a predetermined distance on the outer surface of one of the mutually connected steel members, and the other end of these two steel members is fixed. A box-shaped joint with a slit-shaped opening provided between the sides, and a T-shaped joint that is fixed to the outer surface of the other steel member and inserted into the box-shaped joint through the opening, and the angle member One end of each arc-shaped leaf spring was fixed to the inner surface of the other end, and a plurality of through holes were bored in the free end of each leaf spring.

<<Operation>> According to the water-stop structure of the joint configured as described above, when the T-shaped joint is inserted into the box-shaped joint through the opening, the portion where the angle member of the box-shaped joint and the T-shaped joint face each other An arc-shaped leaf spring is fixed to the inner surface of the other end of the angle member located on the opening side, and
Since a plurality of through holes are provided in the free end of each leaf spring, the curable water stop material injected into the joint is prevented from leaking.

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

FIG. 1 shows an embodiment of the water-stopping structure of a steel joint for cofferdams according to this invention.

The water-stop 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.

Arc-shaped plate springs 26, 26, each having one end fixed to the inner edge of the opening 24, are arranged on the inner surface of the corner of each angle member 20, 20, respectively.

These leaf springs 26, 26 are each curved toward the corner of the angle member 20, and a plurality of through holes 28, 28 are formed in the free end sides of the leaf springs 26, 26, respectively.

The drilling position of the through hole 28 is, as shown in FIG. Furthermore, the free end side is preferable.

When the H-beams A, B... are connected to each other via the joint part 10 and driven into the ground, the inside of the joint space 22 is cleaned with jet water or the like to remove earth and sand, and then the injection pipe 30 is installed, water is poured into a curable water stop material 32 such as grout, and the water stop material 32 hardens to ensure water stop properties of the joint portion 10.

In this case, the water stop material 3 discharged from the injection pipe 30
2 passes through a through hole 28 bored on the free end side of the leaf spring 28 and goes around to the corner side of each angle member 20, 20, but one end of the leaf spring 20 is connected to the angle member 2.
0, the water stop material 32 is filled into the corner of the angle material 20, and its filling pressure presses the leaf spring 28 toward the T-shaped joint 18.

As a result, the gap between the T-shaped joint 18 and the opening 24 is closed by the leaf spring 28, and leakage of the water stop material 32 is reliably prevented.

Note that the injection pipe 30 may be attached in advance to either the T-shaped joint 18 or the flange 12 of the H-shaped steel A;
When driving and penetrating the shaped joint 18, its movement in the connection direction is restricted, thereby preventing the penetration direction of the H-shaped steel B from being inclined diagonally with respect to the connection direction, and reducing penetration resistance. .

<<Effects of the invention>> As explained in the examples above, according to the water-stopping structure of the joint part of cofferdam steel materials according to this invention, leakage of the water-stopping material injected into the joint part to the outside is ensured. Since it can be prevented, problems such as water pollution will also be eliminated.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a joint structure according to the present invention. 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...Plate spring, 28...Through hole, 32...Water stop material.

Claims (1)

[Scope of utility model registration request] In water-stopping structures of steel materials such as H-type steel, I-type steel, steel pipes, etc., which are penetrated into the ground by being connected to each other via joints and injecting a curable waterstop material into the joints, one side that is connected to the other One end of a pair of L-shaped angle members is fixed at a predetermined distance on the outer surface of a steel member, and a slit-shaped opening is provided between the other ends of the box-shaped joint. a T-shaped joint that is fixedly installed and inserted into the box-shaped joint through the opening, one end of an arc-shaped leaf spring is fixed to the inner surface of the other end of the angle member, and each plate A water-stopping structure for a joint of steel material for cofferdam work, characterized by having a plurality of through holes drilled in the free end of a spring.