JPS59233016A - Construction work of continuous underground wall - Google Patents

Abstract

PURPOSE:To construct a continuous underground wall having excellent water sealing property by a method in which a propelled jack is set toward the direction of excavation in contact with a columnar excavating blade provided toward the direction of excavation, and columnar unit walls are erected as the jack extends or shrinks. CONSTITUTION:Two excavating blades 1 are inserted into pillar-row holes 5 and an excavating blade 11 is set toward the direction of excavation. When a jack 6t set in a fitting groove 2 is extended, the blades 1 bite into the ground and move toward the direction of excavation. A trench is excavated to the width of the blades 1, and then the jack 6 is contracted and removed out of the fitting groove 2. The navel 31 of the unit wall 3 is fitted into the groove 2, and the unit wall 3 is erected into the trench. The same operations are repeated orderly to construct a continuous underground wall.

Description

[Detailed description of the invention] The present invention relates to a construction method for continuous underground walls.

An underground continuous wall construction method exists as a method of constructing a continuous earth retaining wall underground.

This construction method uses a stabilizing liquid to prevent the excavated wall from collapsing while excavating a wall-shaped trench underground, and then constructing a continuous wall of unreinforced or reinforced concrete.

However, this method has the following problems.

<B> Requires a large space for processing muddy water.

<mouth> A muddy water treatment facility will be required, which will increase the construction cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for constructing a continuous underground wall that can reduce construction costs and has excellent water-stopping properties.

That is, in the present invention, a columnar cutting blade is arranged underground in the excavation direction, a propulsion jack is placed in contact with this excavation blade and directed in the excavation direction, and each time the propulsion jack expands and contracts, the columnar distortion body wall This relates to a method of constructing a continuous underground wall, which is constructed by erecting and sequentially joining.

Next, the structure used in the construction method of the present invention will be explained.

[A] Trenching blade The trenching blade 1 is shown in FIG. 1. J: A sharp digging blade 11,
It is composed of a body part 12 that is integrated with this excavating blade 11.

The excavating blade 11 is a column with a tree-like cross section formed by intersecting two sides.

A fitting groove 2 is continuously provided in the body part 12 of the cutting blade 1 in the longitudinal direction.

The cutting blade 1 is formed of a precast plate (hereinafter referred to as 20 plate) or the like in order to be used as a structure after cutting.

[Explanation] Single wall The single wall 3 is a connecting member that fits into the fitting groove 2 of the cutting blade 1 to form a continuous underground wall.

The single wall 3 has a tenon 31 of the same width as the fitting groove 2 protruding from one side of a square prism, and a joining groove 32 which is continuous in the same direction as the tenon 31 is recessed and formed on the back side of the tenon 31.

The joining groove 32 has a dimension equal to or slightly wider than the thickness of the tenon 31.

That is, the protrusion of the tenon 31 and the opening of the joining groove 32 are formed on the same line.

Since the single wall 3 is also used as a structure like the trench cutting blade 1, it is formed of a PC plate or the like.

Next, we will explain how to construct underground walls.

[41 Opening of Column Row Holes Auger holes of a predetermined depth are overlapped and opened on the line where the underground wall is to be constructed, and columnar holes 5 are opened.

The columnar holes 5 are not opened along the entire line, but are opened continuously to the extent that the two cutting blades 1 can be inserted therein.

[Installation of mouth 1 trench cutting blade (Fig. 3) Two cutting blades 1 are inserted into the columnar holes 5.

At this time, each of the cutting blades 1 is arranged so that the body portion 12 faces each other, and the cutting blades 11 are oriented in the left and right cutting directions, respectively.

As a result of opposing the body parts 12 and 12, the cutting edge 3- A continuous space is formed between the two.

In this space, a plurality of propulsion jacks 6 are arranged in the excavation direction.

The propulsion jack 6 has a known structure that expands and contracts with hydraulic pressure.

[C] Cutting (FIG. 4) When the propulsion jack 6 placed in the fitting groove 2 is extended, the cutting blade 1 digs into the ground and moves in the cutting direction while compressing the surrounding earth and sand.

As a result, each trench cutting blade 1 is
moves forward.

That is, cutting is performed for a distance equal to the total forward distance of each cutting blade 1.

Further, when moving the cutting blade 1 forward, the auxiliary hole 51 may be previously drilled in contact with the columnar hole 5 in order to smoothly perform cutting with the cutting blade 1.

The opening of the auxiliary hole 51 is appropriately determined in consideration of the soil condition at the site.

[2] Construction of a single wall (Fig. 5) The length of the extension distance of the propulsion jack 6 is the width of the excavation blade 1 4- After opening the groove, reduce the propulsion jack 6.

When the reduction is completed, the propulsion jack 6 is removed from the fitting groove 2 and removed.

Next, the tenons 31 of the single wall 3 are fitted into the fitting grooves 2 of both cutting blades 1, and the single wall 3 is built.

When fitting the single wall 3 to the cutting blade 1, a city water packing 4 is laid on the side surface of the groove 31 parallel to the cutting direction to improve the adhesion of the contact surface.

After the tenon 31 is fitted, the space remaining in the fitting groove 2 is filled with mortar or concrete,
The purpose is to integrate the single wall 3.

As a result of interpolating the single walls 3, there is a joint between the single walls 3) R32
A space is formed in which the two faces face each other.

And the propulsion jack 6 in a contracted state again in this space
Install it facing the excavation direction.

[E] When the propulsion jack 6 disposed in the cutting joint groove 32 is extended, its force is transmitted to the cutting blade 1 through the single wall 3, and cutting progresses by the distance that the propulsion jack 6 has extended.

After completing the excavation, remove the Jft Suji V Tsuki 6, add a new single wall 3, and install the propulsion jack 6 again.
! By repeatedly excavating and excavating the ground, one continuous underground wall was constructed.

When the excavation is finally completed, the joint grooves 32 and other spaces generated between the single walls 3 are filled with mortar or cement to complete 11: a highly water-based monolithic underground wall. (6th
Figure) [Go to 1] A further example In the above example, the case where an underground wall is constructed by excavating in two directions, right and left, was explained, but it is also possible to construct a similar underground wall by excavating in one direction. I can do it.

Since the present invention is as explained to J.S., the following effects can be achieved.

<B> Conventionally, excavation work and underground wall construction work were performed independently, but in the present construction method, the underground wall is constructed at the same time as the excavation work.

Therefore, it becomes unnecessary to construct an underground wall independently, and construction can be carried out efficiently.

<Mouth> Since the excavation blade is excavated by the extension force of the propulsion jack, there is no need to worry about vibration or noise occurring during excavation.

<C> Since the excavation blade and single wall are composed of 10 plates, they can be used as a structure as is.

<2> By fitting the trench blade or the single walls together and further arranging the seals, an underground wall with a high water-stopping effect is constructed.

<B> By filling the space created at the joint between single walls with mortar or concrete, it is possible to construct an integrated underground wall.

When excavating even unstable ground, the cutting blade and single wall press against the back ground, suppressing loosening, preventing subsidence, and stabilizing the ground.

〉Since muddy water is not used, a large space is not required.

〈〈〉Since muddy water treatment facilities are not required, construction costs can be reduced.

(S) Required construction equipment is simpler than the underground continuous wall construction method.

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[Brief explanation of the drawing]

Figure 1 2 Explanatory diagram of the structure used in the present invention Figure 2: Explanatory diagram of the joint structure between single walls Figures 3 to 5: Explanatory diagram of the construction state Figure 6: Explanation of the underground wall upon completion Figure 1: Cutting edge 2: 1m groove 3: Single wall 6: Propulsion jack applicant
Taisei Construction Co., Ltd. 9-8- ■ Turnover Cv)
sect■ I-fu vein

Claims (1)

[Scope of Claims] A column-shaped excavation blade is placed underground in the excavation direction, a propulsion jack is placed in contact with the excavation blade and directed in the excavation direction, and each time the propulsion jack expands and contracts, the column-shaped single piece is disposed. A continuous underground wall construction method in which walls are built and joined one after another.