JPH01163314A - Confirming method for water-stopping property between steels for coffering work - Google Patents

Abstract

PURPOSE:To confirm water-stopping property by a method in which a perforated pipe is inserted into the space between a box-like coupler and a T-shaped coupler to be inserted into the inside of the box-like coupler, a water-stopping agent is packed, and changes in water pressure within the pipe are measured. CONSTITUTION:H-steels A and B are coupled with a box-like coupler 14 and a T-shaped coupler 18 and driven into the ground. A joint tube 26 with through holes 30 is attached to the joint space and a hardening water-stopping agent 36 is injected through an injecting tube 34. After the agent 36 hardens, the inside of the tube 26 is closed with a packer 38, a pipe 40 with a through hole 39 is inserted into the packer 38, and water is supplied into the packer 38 to detect a water-stopping property from changes in the pressure. When defect places are found, the agent 36 is injected into the tube 26 for repairing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for confirming the water-stopping properties of a hardening water supply material such as mortar injected between cofferdam steel materials.

(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 with a slit-shaped opening is fixed on the side surface of one of the steel pipe sheet piles that are interconnected. , on the side of the other steel pipe sheet pile are fixedly installed T-shaped joints that are inserted into the inside of the box-shaped joint through the opening, and when the steel pipe sheet pile is penetrated into the ground, these joints The concrete is cast while engaging with each other.

Thereafter, a hardening water-stopping material such as mortar is injected into the joint using an injection pipe, and the water-stopping material hardens to ensure the water-stopping properties of the cofferdam.

However, such water supply methods have the following problems.

(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 steel pipe sheet pile is quite long, it tilts forward, backward, left and right in the elongated 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 the direction perpendicular to the connection direction is , 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 connecting 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 connecting direction. Therefore, there was a problem in that the penetration resistance of the steel pipe sheet piles increased.

When the steel pipe sheet piles are installed in an inclined state like this, it becomes difficult to inject waterstop material into the joints.
Not only will sufficient water-stopping properties not be obtained, but it will also be difficult to confirm the water-stopping properties of the water-stopping material.

This invention was made in view of these conventional problems, and its purpose is to reduce as much as possible the penetration resistance of steel materials that are cast into the ground and to stop the penetration. To provide a method for confirming water-stopping properties between steel materials for cofferdams, which allows easy injection of water materials and also allows easy confirmation of water-stopping properties.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides joints of steel materials such as H-shaped steel, engineering steel, steel pipes, etc., which are interconnected and penetrated into the ground through joints. In a water supply method in which a hardening water stop material is injected into the joint part, the joint part is connected to a box-shaped joint having a slit-shaped opening fixedly fixed to the outer surface of one of the steel members, and the outer surface of the other steel member. and a T-shaped joint that is fixed to the box-shaped joint and inserted into the box-shaped joint through the opening, and the lower end is closed to either the T-shaped joint or the outer surface of the one steel material, and the shaft A joint pipe in which through holes are intermittently drilled at predetermined intervals in the direction and covered with a flexible member is fixed, and after the water stop material is injected and hardened, the through holes in the joint pipe are It is characterized in that a pressurized fluid is supplied nearby, and the water-stopping property of the water-stopping material is detected from the pressure change of the pressurized fluid.

(Function) In the confirmation method for the above configuration, since a joint pipe is provided on either the outer surface of the T-shaped joint or one of the steel members, the movement of the T-shaped joint in the connection direction is restricted by this joint pipe. As a result, the penetration resistance of the steel material is reduced, and a joint space into which the water stop material is injected is secured, making it possible to easily inject the water stop material.

In addition, since the joint pipe is intermittently drilled with through holes covered with flexible members in its axial direction, if pressurized fluid is supplied near the through holes after the water stop material has hardened, If there is a defective part such as a cavity, the pressurized fluid will press the flexible member and flow out of the joint tube, so it can be easily confirmed from the pressure change of the fluid whether water-tightness is ensured.

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

FIGS. 1 and 2 show an embodiment of the method for confirming water-tightness between steel materials for cofferdams according to the present invention.

The confirmation method shown in the figure is an application of the present invention to a steel material made of H-shaped steel, 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.
It is generally composed of a square-shaped joint 14 fixed to the outer surface of the flange 12 of the steel B, and a T-shaped joint 18 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 made of H-shaped steel A, B
It extends along its entire length in the longitudinal direction.

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.

On the outer surface of the T-shaped joint 18, joint pipes 26 in the form of hollow pipes are fixedly installed along the entire length thereof on the central axis, and the joint pipes 26 are arranged such that the T-shaped joint 18 is connected to the opening 2.
4 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.

The joint tube 26 has ribs 28, 28 protruding in the radial direction at a predetermined interval on its outer periphery, and one of the ribs 28 is welded to the outer surface of the T-shaped joint 18.

Furthermore, through holes 30 are intermittently bored along the axial direction between the ribs 28 of the joint tube 26, and each through hole 30 is covered with a packing 32 made of a flexible rubber material. ing.

The H-shaped steels A, B, .

In this case, when the T-shaped joint 18 is inserted into the joint space 22 of the box-shaped joint 14 through the opening 24, the T-shaped joint 18
Since a pipe-shaped joint tube 26 is provided on the outer surface of the flange 16 of the H-shaped steel A to be connected, the joint tube 26 or rib 28 allows movement of the T-shaped joint 18 in the connection direction. This prevents the direction of penetration of the H-shaped steel B from being obliquely inclined with respect to the connection direction, reduces penetration resistance, and maintains the joint space 22 at a predetermined interval.

Furthermore, since the joint tube 26 is provided with the protruding ribs 28, the contact area with the flange 14 of the H-shaped steel A becomes a partial line contact, and since the contact area becomes small, frictional resistance can also be reduced.

Then, when the required H-beams A, B,... are cast,
After the earth and sand in the joint space 22 are removed with water or the like, an injection pipe 34 is installed in the joint space 22, and a hardening water stop material 36 such as mortar is injected.

When the injected water stop material 36 hardens, the water stop property of the water stop material 36 is confirmed as shown in FIG.

To check the watertight property, rubber packers 38 with a semicircular cross section are installed at the top and bottom of the joint pipe 26 with their lower ends closed and at intervals shorter than the drilling intervals of the through holes 30 of the joint pipe 26. A pipe 40 having a through hole 39 bored between the nozzles 38 and 38 is inserted.

For example, a water supply means equipped with a pressure gauge is connected to the upper end of this pipe 40, and the through hole 30 is connected between the valve 38.
Water is supplied only to the vicinity of the through hole 30 with the outer surface of the gasket 38 in pressure contact with the inner surface of the joint tube 26.

In this way, for example, if there is a defect such as a crack or a cavity in the hardened water stop material 36, the water will press against the gasket 32 covering the through hole 30 and flow out to the outside. The water-stopping properties of the water-stopping material 36 can be detected by measuring pressure changes.

The above confirmation operations are performed sequentially for all through holes,
If there are any defects, after the confirmation operation is complete,
What is necessary is to inject a water stop material 36 into the joint pipe 26 to repair it.

FIG. 3 shows another embodiment of the joint tube 26 used in the method of this invention, and only its features will be described below.

In the embodiment shown in the figure, a flexible seal 32a that covers the through hole 30 bored in the joint pipe 26 is formed in a semicircular shape, and this seal 32a is attached to the T-shaped joint 18.
It is fixed on the outside of the

Even if the joint tube 26 configured in this manner is used, the same effects as in the above embodiment can be obtained.

In addition, although H type steel A and B were illustrated as the steel material which connects and penetrates into the ground in the said Example, the steel material to which this invention is applied may be a steel pipe sheet pile.

Further, the joint pipe 26° 26a shown in the above embodiment may be attached to the steel material side on which the box-shaped joint 14 is fixedly installed.

(Effects of the Invention) As explained in the examples above, according to the method for checking the water-tightness between steel materials for cofferdams according to the present invention, the penetration resistance when pouring steel materials can be significantly reduced. In addition to making it easier to cast the steel material on a predetermined line, the space for injecting the water-stopping material is reliably secured.

Moreover, the water-stopping properties of the cured water-stopping material can also be easily confirmed.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show the first embodiment of the confirmation method according to the present invention, Fig. 1 is a plan view when steel material is cast, and Fig. 2 is a measurement of the water-stopping property of the water-stopping material. An explanatory diagram when
FIG. 3 is an explanatory view showing another example of the joint tube used in the method of this invention. 10......Joint part 12...Flange 14...
・・・・・・Box type joint 16・・・・・・・・・・・・
Flange 18...... Single-shaped joint 20
・・・・・・・・・・・・Angle material 22・・・・・・
......Joint space 24...Opening 26...Joint pipe 30...
......Through hole 32...Putskin 36...
・・・・・・Water stop material A, B・・・・・・H type steel

Claims (1)

[Claims] In a water-stopping method in which a curable water-stopping material is injected into the joints of steel materials such as H-type steel, I-type steel, and steel pipes that are interconnected and penetrated into the ground through the joints, the joints are interconnected. A box-shaped joint that is fixed to the outer surface of one steel material and has a slit-shaped opening, 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. and a flexible member having a lower end closed on either the T-shaped joint or the outer surface of the one steel material, and having through holes intermittently drilled at predetermined intervals in the axial direction. A joint pipe covered with water is fixed, and after the water stop material is injected and hardened, pressurized fluid is supplied to the vicinity of the through hole in the joint pipe, and from the pressure change of this pressurized fluid, the water stop material is A method for checking water-stopping properties between steel materials for cofferdams, characterized by detecting water-stopping properties of steel materials for cofferdam construction.