JPH01163313A - Water-stopping method for joint of steel material for coffering work - Google Patents

Abstract

PURPOSE:To prevent the leak of water-stopping agent by a method in which a flexible ring part is set between a box-like coupler and a T-shaped coupler to be inserted into the inside of the box-like coupler, and a water-stopping agent is injected while supplying a fluid into the ring part for expansion. CONSTITUTION:A box-like coupler 14 consisting of angled parts 20 is formed on one end of an H-steel A, and a T-shaped coupler 18 is formed on an H-steel B to be connected with the coupler 14. Ribs 28 are projectionally formed on the inner surfaces of the outer ends of the parts 20 to hold a hose 30. After driving the steels A and B, a fluid, e.g., compressed air or water, is supplied to the hose 30 for expanding its diameter, during which period a curable water- stopping agent 34, e.g., grout, etc., is injected through an injecting tube 32. The leakage of the agent 34 can thus be prevented and strong water-stop work can be obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for stopping water at joints of steel materials for cofferdams.
In particular, the present invention relates to a water-stopping method for preventing a curable water-stopping material from leaking outside from a joint portion.

(Prior art) As is well known, in foundation work for bridge piers, etc., cofferdams are built 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.

The steel materials used for such cofferdams usually have joints that are fixed to each steel material in advance to engage with each other, for example,
An example of this is shown in Japanese Patent Publication No. 59-44462.

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. T-shaped joints that are inserted into the box-shaped joint through the opening are fixed on the side of the other steel pipe sheet pile, and these joints are inserted when the steel pipe sheet pile is penetrated into the ground. They are cast while being engaged with each other.

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

(Problem to be Solved by the Invention) In other words, when driving steel pipe sheet piles, a guide such as an H-shaped steel is installed and the steel pipes are driven along a set line. 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 the box-shaped joint unless a certain amount of space is provided between the opening and the T-shaped joint.

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 invention was made in view of these conventional problems, and its purpose is to provide a joint for steel materials for cofferdams that can reliably prevent leakage of the water stop material injected into the joint. The purpose of the present invention is to provide a method for stopping water in the area.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for penetrating into the ground by connecting them through joints, and injecting a hardening water stop material into the joints. In a water-stopping method for steel materials for cofferdams such as H-shaped steel, ■-shaped steel, and M 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 materials, A box-shaped joint having a slit-shaped opening between the other ends thereof, and a T-shaped joint that is fixed to the outer surface of the other steel material and inserted into the box-shaped joint through the opening. , a flexible annular member whose diameter is expandable and which is closed at one end is disposed on either the angle member or the T-shaped joint, and when the water stop material is injected, a fluid is applied to the annular member. It is characterized by supplying and expanding the diameter.

(Function) According to the water supply method for the joint configured as described above, when the stopper is injected, fluid is supplied to the flexible annular member to expand its diameter, and its outer surface abuts against the T-shaped joint or the angle member. This prevents the curable water stop material injected into the joint from leaking.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the water-stopping method for a joint for steel materials for cofferdams according to the present invention.

The water stopping method shown in the figure is an application of the present invention to a steel material composed of H-shaped steels, and these H-shaped steels are driven and penetrated into the ground while being connected to each other via joints 10. .

The structure of the joint part 10 is such that one H-shaped steel A is connected to the joint part 10.
The box-shaped joint 14 is fixed to the outer surface of the flange 12 of the steel B, and the T-shaped joint 18 is fixed to the outer surface of the flange 16 of the other H-shaped steel B.

The above box-shaped and T-shaped joints 14.16 are H-type fI4A
, B along its entire length.

The box-shaped joint 14 is composed of a pair of angle members 20.20, which are spaced apart from each other by a predetermined distance, and one end of which is welded to the outer surface of the flange 12 to form a joint space 22 with a rectangular cross section. A slit-shaped opening 24 is provided on the central axis of the flange 12 in the width direction.

And, on the inner surface of the outer end side of each angle member 20.20,
A pair of ribs 28, 28 are protruded from each other, and between each rib 28, 28 is a hollow annular hose 30, 30 whose lower end is closed and whose diameter is expandable and is made of a flexible member such as rubber.
is being held.

When the H-shaped steels A, B, etc. 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. ,
Install the injection pipe 32 and apply a hardening water stop material 3 such as grout.
4 is injected.

At this time, fluid such as compressed air and water is supplied to the hose 30.

As a result, since the hose 30 is held between the ribs 28 on both sides, its expansion to the side is restricted, and the T-shaped joint 1
The diameter expands only toward the 8 side, and the outer surface of the hose 30 is connected to the joint 18.
It comes into contact with the surface and the opening 24 is closed.

When the water stop material 34 is injected as described above, the water stop material 34
leakage is reliably prevented, contamination with seawater, etc. is eliminated, and the joint space is sufficiently filled with the water stop material 34, and when it hardens, a strong water stop property is obtained.

Note that the injection pipe 32 may be attached in advance to either the T-shaped joint 18 or the flange 12 of the H-shaped steel A, and in this way, when driving and penetrating the T-shaped joint 18, Movement in the connection direction is restricted, thereby preventing the penetration direction of the H-type mB from being obliquely inclined with respect to the connection direction, reducing penetration resistance.

Furthermore, it is of course possible to arrange the hose 30 on the T-shaped joint 18 side.

Furthermore, the cofferdam steel +4 may be not only H-shaped steel but also steel pipe sheet piles.

(Effects of the Invention) As explained above in the embodiments, according to the method for stopping water at a joint of cofferdam steel materials according to the present invention, leakage of the water-stopping material injected into the joint to the outside is ensured. Since it can be prevented, problems such as water pollution will also be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the water stopping method according to the present invention. 10......Joint part 12...Flange 14...
・・・・・・Box type joint 16・・・・・・・・・・・・
Flange 18...... Single-shaped joint 20
・・・・・・・・・・・・Angle material 22・・・・・・
......Joint space 24...Opening 28...Rib 30... Hose 34・・・・・・・・・Water stop material

Claims (1)

[Claims] In a water-stopping method for cofferdam steel materials such as H-type steel, I-type steel, and steel pipes, which are penetrated into the ground by being connected to each other via joints and injecting a hardening water-stopping material into the joints, the joints are connected to each other. A box-shaped joint in which one end of a pair of L-shaped angle members is fixed at a predetermined distance on the outer surface of one of the steel members, and a slit-shaped opening is provided between the other ends, and the other steel member and a T-shaped joint that is fixed to the outer surface of the box-shaped joint and inserted into the box-shaped joint through the opening, and has one end closed to either the angle member or the T-shaped joint and is expandable. A stopper for a joint portion of a steel material for cofferdam work, characterized in that a flexible annular member is disposed, and when the water stopper material is injected, a fluid is supplied to the annular member to expand the diameter of the annular member. water method.