JP2791829B2 - How to build a continuous underground wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a continuous construction of a pier, a shaft of a tunnel, a ventilation tower, and the like in order to manufacture a structure such as a bridge pier, a tunnel shaft, a ventilation tower, and the like on the underwater ground continuously from above the water. It relates to a method of constructing an underground wall.

<Conventional technology> When constructing a pier, a tunnel shaft, a ventilation tower, and the like underwater, it is necessary to continuously construct a wall in the ground.

Conventionally, in such a case, a method of continuously constructing an underground wall from the surface of the water to the underwater ground has been adopted.

First, the necessary range from the bottom to the water surface is closed with a partition steel or the like.

The artificial ground was manufactured by replacing the water during that time with earth and sand, artificial ground, etc., and a continuous underground wall was constructed.

<Problems to be Solved by the Present Invention> When the above-described conventional technology is used, the following problems occur.

(B) When constructing a continuous underground wall, the necessary range from the bottom to the water surface is to be closed using partition steel or the like.

Then, after the water in the meantime is replaced with earth and sand, artificial ground, etc., artificial ground is manufactured and construction of the continuous underground wall is performed.

For this reason, preparation work before the construction of the continuous underground wall takes time, and at the same time, there is a problem in terms of economy.

(B) When replacing partitioned water with earth and sand, artificial ground, etc.,
The surrounding water may be contaminated, which may cause environmental problems.

(C) The production area of the artificial ground requires several times the area of the construction area of the continuous underground wall.

As a result, the occupied area becomes large, which causes inconveniences such as hindering navigation of the passing ship.

<Object of the present invention> The present invention has been made in order to solve the above-mentioned problems, is easy to construct, does not take up a construction area, and provides a method for constructing a continuous underground wall in consideration of environmental conservation. With the goal.

<Means for Solving the Problem> The present application relates to a method of constructing a continuous underground wall in which hollow guide blocks are continuously installed and constructed in a submarine ground. Is excavated, concrete is poured into the excavation trench after reinforcing bars are built, and the underground wall completed as above is guided by guide block 1.
Every other time, the underground wall is constructed in the same process as above, and the underground wall is constructed in the hollow guide block between the two underground walls in the same process as described above. A continuous underground wall construction method characterized by forming a continuous underground wall by repeating further.

<Configuration of the Present Invention> Hereinafter, the present invention will be described in detail.

(A) Overall Configuration According to the method of constructing the continuous underground wall 1 of the present invention, first, the hollow guide block 2 is continuously constructed in the underwater ground, and the underwater ground A inside the guide block 2 is excavated. Then, a steel cage or the like is erected in the excavation groove, and concrete B is driven in, thereby completing one underground wall 1a.

Next, using the above process, the guide block 2c is
Build the underground wall 1b on the next adjacent guide block 2b,
Further, the underground wall 1c is constructed on the guide block 2c between the two underground walls 1a and 1b by using the above process.

The continuous underground wall 1 is formed by repeating the construction process of the three continuous underground walls 1a, 1c, and 1b.

(B) Installation of guide block FIGS. 1 to 11 show an embodiment of a method of constructing a continuous underground wall according to the present invention.

The guide block 2 is a vertically long frame, made of steel or
It consists of PC members and the like.

The guide block 2 is carried by a crane ship or the like,
From the state of being suspended from above the water, it is installed so as to be embedded in the underwater ground A by a required length 1 (inset length).

Further, according to the area of the continuous underground wall 1 to be constructed, additional guide blocks are continuously installed beside the guide blocks 2, and adjacent guide blocks are joined using a known joining method.

(C) Excavation of underwater ground FIGS. 2 to 6 show a construction process of the first underground wall.

After installing the guide block 2, the water in the guide block 2 is replaced with the stabilizing liquid 3.

 Next, the underground wall 1a is constructed on the guide block 2a.

In the construction method, first, a known excavator 4 is installed in the guide block 2 a replaced with the stabilizing liquid 3.

Then, the excavator 4 is operated to excavate the water bottom ground A inside the guide block 2a downward by a certain depth.

At this time, the widening bit of the excavator 4 performs widening excavation of the bottom part of the partition wall of the guide block 2a.

(E) Concrete placement After the excavation is completed to a predetermined depth, as shown in Fig. 5, a reinforcing bar basket 5 made of a reinforcing bar or a steel material is built.

Concrete B is cast from above the position where the reinforcing bar 5 is built using a concrete casting pipe or a hose.

 Thus, one underground wall 1a is completed.

(G) Construction of Second Underground Wall Next, FIGS. 7 and 8 show a construction process of the second underground wall 1b in order to continuously construct the underground wall.

One hollow guide block 2b adjacent to the underground wall 1a completed in the above process is sandwiched, and a second underground wall 1c is constructed on the adjacent guide block 2c.

The steps from the excavation to the construction of the concrete B in the process up to the construction of the underground wall 1c are the same as the construction of the underground wall 1a, and will not be described.

With the above, a hollow guide block 2b is sandwiched between 2
The concrete underground walls 1a and 1c are completed.

(H) Construction of Third Underground Wall Next, FIGS. 9 and 10 show a construction process of the third underground wall.

In order to connect the two concrete underground walls 1a and 1c completed as described above, a third underground wall 1b is constructed on the guide block 2b between the two underground walls 1a and 1c.

The steps from the excavation to the placement of the concrete B are the same as those of the above two underground walls 1a and 1c, and thus the description thereof is omitted.

Thus, a continuous underground wall for three guide blocks was completed.

Then, by repeating the above operation, a further wide continuous underground wall is constructed as shown in FIG.

<Other Examples> Hereinafter, other examples of the present invention will be described.

When constructing the third wall, that is, the intermediate wall, by using a widening cutter to excavate the underground in the guide block, it is also possible to excavate while cutting laterally to concrete on both side walls.

<Effects of the Present Invention> According to the present invention, the following effects can be obtained.

(A) The guide block of the present invention is manufactured in another place,
It is only installed on site.

Therefore, since it is not necessary to manufacture an artificial ground or the like, not only the construction period is shortened, but also the economic efficiency is improved.

(B) In the present invention, it is only necessary to replace the water in the guide block with the stabilizing liquid.

Therefore, there is no need to worry about contaminating surrounding water, which is optimal for environmental protection.

(C) The installation area of the guide block may be approximately equal to the construction area of the continuous underground wall, and the occupied area can be reduced.

Accordingly, unlike the related art, the production area of the artificial ground does not require an area several times larger than the construction area of the continuous underground wall.

Further, since the occupied area is reduced, there is no hindrance to navigation of the passing ship.

[Brief description of the drawings]

 FIG. 1: A perspective view of the guide block FIG. 2: A front view of the guide block after installation on the underwater ground FIG. 3: A front view of the guide block during excavation FIG. 4: A front view of the guide block after excavation FIG. : Front view of guide block after installation of reinforcing bars Fig. 6: Front view of first underground wall when completed Fig. 7: Front view of guide block during excavation for second underground wall Fig. 8: Second ground Figure 9: Front view of the guide block during excavation for the 3rd underground wall Figure 9: Front view of the 3rd underground wall when the underground wall is completed Fig. 11: When the continuous underground wall is completed Front view

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-146691 (JP, A) JP-A-57-130621 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 5/18-5/20 E02D 19/04

Claims (1)

(57) [Claims] 1. A method for constructing a continuous underground wall in which hollow guide blocks are continuously installed and constructed in a submarine ground, wherein the guide block is replaced with a stable liquid, and then the submarine ground is excavated. Concrete is driven in after the reinforcing bars are built, and the underground wall completed as described above is constructed every other guide block by the same process as described above. In the hollow guide block between the two underground walls, A method of constructing a continuous underground wall, comprising: constructing an underground wall in the same process as described above, and forming a continuous underground wall by further repeating the three underground wall building steps.