JP2000170158A - Recharging method for underground stream intercepted by construction of linear underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit to recharge an intercepted underground stream by forming relatively freely effective water flow holes by flowing an underground stream blocked by an underground structure from one side to the other side of the underground structure through water flow holes formed below the main body of a linear underground structure of diaphragm walls accompanied to the main body of a linear underground structure. SOLUTION: When building a diaphragm wall 2 in an inground trench excavated by slurry method, a water flow hole 7 is formed at a position lower than the main body 1 of an underground structure of the diaphragm wall 2 accompanied to the main body 1 of the linear underground structure, and the underground stream blocked by the underground structure is flowed from one side to the other side of the linear underground structure through the water flow hole 7. That is, a frame body built in a steel bar cage at a position lower than the main body 1 of the linear underground structure in the inground trench is installed, the mud in an air bag inside the frame body is used for removing mud from the frame body, and the ingress of concrete to the inside of frame body is prevented. Then, after placing concrete in the inground trench and building the diaphragm wall 2, a impervious solidified membrane on the inground trench surface is destroyedby a high pressure water jetting equipment, thereby creating a flow of underground stream through the frame body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for condensing underground water interrupted by the construction of a linear underground structure such as a subway.

[0002]

2. Description of the Related Art Conventionally, on the ground where underground water veins exist,
For example, when constructing a linear underground structure such as a subway,
The underground continuous wall is being constructed along with the main body of the linear underground structure in order to stop water and secure the supporting capacity during construction. At the same time, the underground water vein is cut off, and a difference in groundwater level occurs on both sides of the linear underground structure, often causing various obstacles.

It is conventionally known that a horizontal water pipe is buried at the bottom of the main body of the linear underground structure in order to return the blocked underflow water (to release the blocked state). In the case of the example, the installation position of the water pipe is limited to the bottom of the main body of the linear underground structure, and it is difficult to expect that the flow rate is too large.

[0004]

The problem to be solved by the present invention (object of the present invention) is that there is no restriction as in the case of the above-mentioned known example, and that an effective water inlet is formed relatively freely. Another object of the present invention is to provide a technology capable of condensing underflow water interrupted during construction of a linear underground structure.

[0005]

In order to solve the above-mentioned problems, a method of condensing underground water interrupted by the construction of a linear underground structure according to the present invention (hereinafter referred to as a method of the present invention) is basically used. A water passage is formed at a position below the linear underground structure main body of the underground continuous wall associated with the linear underground structure main body, and the underflow water blocked by the linear underground structure through the water penetration is formed. It flows from one side of the linear underground structure to the other side.

According to the method of the present invention, specifically, at the time of forming the continuous underground wall attached to the linear underground structure main body, a position below the linear underground structure main body in the underground trench excavated by the muddy water method. Then, a frame body for forming a water hole is installed by incorporating it into a reinforcing steel cage, and muddy water in the frame body is eliminated by an air bag put in the frame body, and concrete is prevented from entering the frame body. After concrete is poured into the inside, and an underground continuous wall is created, the water-tight solidified film of the underground groove surface at which both ends of the frame oppose each other with a high-pressure water spray device inserted in place of the air bag in the frame. The underground water is broken so that the underflow water flows from one side of the underground continuous wall to the other side through the frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing the overall appearance of a linear underground structure such as a subway, reference numeral 1 denotes a linear underground structure main body, and 2 denotes an underground continuous wall attached to the linear underground structure main body 1. The underground continuous wall 2 shown in the drawing serves for retaining water when the linear underground structure main body 1 is constructed, and serves for supporting the linear underground structure main body 1 together with the pile 3 after construction. It has become.

Reference numeral 4 denotes an underground water level before the construction of the linear underground structure (refers to the whole of the linear underground structure main body 1 and the underground continuous wall 2), and reference numeral 5 denotes one side of the linear underground structure after the construction. (Upstream side)
The underflow water level 6 is also the underflow water level on the other side (downstream side), and the method of the present invention uses the linear underground water generated by blocking the underflow water in the construction of the linear underground structure. This is intended to eliminate the height difference between the underground water levels on both sides of the underground structure and to return to the state of the original underground water level 4.

Reference numeral 7 denotes a linear underground structure main body 1 of the underground continuous wall 2.
In the method of the present invention, underflow water blocked by the linear underground structure flows from one side of the linear underground structure to the other side through the water supply port 7 in the method of the present invention. The basic feature of this is that the following 7
One method of forming the gate will be described with reference to FIGS.

The underground continuous wall 2 has a steel cage 9 installed in an underground trench 8 excavated by a muddy water method and a concrete 10
When the reinforcing bar 9 is installed, the frame 11 for forming the water inlet 7 is incorporated into the reinforcing bar 9 to be lower than the linear underground structure main body 1 in the underground groove 8. To the position.

An air bag 12 is put in the frame 11 in advance, and an air pipe 13 having an end connected to the air bag 12 is connected to the frame 1.
It is put out on the ground through the cylindrical body 14 erected at 1.

Then, first, air is put into the air bag 12,
The air bag 12 is inflated and brought into close contact with the entire inner surface of the frame 11 and the water-tight solidified film 15 on the excavated surface of the underground trench 8.
The muddy water inside is removed and the concrete 10 is prevented from entering the frame 11.
0 is cast.

The concrete 10 is hardened and the underground continuous wall 2
Is completed, the air bag 12 is removed through the cylindrical body 14, the high-pressure water injection device 16 is put in the frame 11 instead, and the water-tight solidified film 15 with the opening end face of the frame 11 facing the high-pressure water Destroyed by spraying.

In FIG. 3, reference numeral 17 denotes a drainage pipe attached to the frame 11, and a liquid substance discharged through the drainage pipe 17 is checked to confirm the degree of destruction of the water-tight film 15. can do.

When the water-blocking consolidation film 15 is sufficiently broken to allow the underflow water to pass through the inside of the frame 11,
The high-pressure water injection device 16 is removed, the inside of the cylinder 14 is filled with concrete, and the inside of the drainage pipe 17 is appropriately closed to complete the operation.

The position of the frame 11 installed on the continuous underground wall 2, that is, the position of the water inlet 7 formed on the continuous underground wall 2 may be any position below the linear underground structure main body 1, The shape, size, and number are arbitrary, which is one of the great advantages of the method of the present invention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall aspect of a linear underground structure to which the method of the present invention is applied.

FIG. 2 is a view showing a state where a frame containing an air bag is installed in an underground groove in the method of the present invention, wherein (a) is a cross-sectional view in a direction perpendicular to the underground groove, and (b) is a direction of the underground groove. FIG.

FIG. 3 is a view showing a state in which a high-pressure water injection device is inserted in the frame body in place of the air bag in the method of the present invention, (a) is a cross-sectional view in a direction perpendicular to the underground continuous wall, and (b) is It is sectional drawing of the direction of an underground continuous wall.

[Explanation of symbols]

1: Linear underground structure main body, 2: Underground continuous wall, 3: Pile,
4: Underground water level, 5: Underground water level, 6: Underground water level,
7: water inlet, 8: underground trench, 9: steel cage, 10: concrete, 11: frame, 12: air bag, 13: air pipe,
14: cylindrical body, 15: water-impermeable consolidation film, 16: high-pressure water injection device, 17: drainage pipe.

Claims (2)

[Claims] 1. A water passage is formed at a position below the linear underground structure main body of an underground continuous wall attached to the linear underground structure main body, and is blocked by the linear underground structure through the water passage. A method of condensing underground water interrupted by the construction of a linear underground structure, characterized by flowing the underflow water from one side of the linear underground structure to the other side. 2. When a continuous underground wall associated with a main body of a linear underground structure is formed, a water passage opening is formed by incorporating a steel cage in a position below the main body of the linear underground structure in an underground trench excavated by a muddy water method. A frame is set up, air mud in the frame is used to eliminate muddy water inside the frame and prevent concrete from entering the frame. In this state, concrete is poured into an underground trench, After forming the continuous wall, the water-blocking solidified film on the underground groove surface where both ends of the frame oppose each other is destroyed by a high-pressure water spraying device inserted in place of the air bag in the frame, and the underflow water flows in the frame. A method for condensing underground water interrupted by the construction of a linear underground structure, characterized in that the underground continuous wall flows from one side of the underground continuous wall to the other side.