JPH06146233A - Method of building bank - Google Patents

Abstract

PURPOSE:To effectively use excavated sludge by filling a mixed slurry composed of, as main components, excavated sludge and solidifier, in a net frame set on the sea bottom, and by repeating this step several times so as to build a bank having a desired height. CONSTITUTION:Net frames 2 are laid on the sea bottom at a height equal in one layer, and a mixed slurry 3 composed of, as main components, excavated sludge and solidifies such as cement is filled under pressure in the inside of the net frames 2 from a working ship through a filling pipe 4. Then, the next frames 2 are laid thereon and then the slurry 3 is filled. With the repetition of the above-mentioned steps a bank having its top end projected from the sea surface is built. In such a case where prevention of water area contamination caused by flow-out of the slurry 3 is desired, a bag made of a water- impermeable film is laid inside of the frames 2 so as to serves as a form in which the slurry 3 is filled, or in which concrete fragments or the like may be filled. With this arrangement, excavated sludge which is to be treated as industrial waste may be effectively used, thereby it is possible to efficiently build the bank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is applied to coastal breakwaters, harbor breakwaters,
The method of constructing a bank body such as a seawall.

[0002]

2. Description of the Related Art Conventionally, as a breakwater body such as a breakwater or a seawall, a rubble stone is piled up with crushed stones that are not blown by waves, or a caisson ridge or rubble stone in which concrete or steel caisson is filled with crushed stones or earth and sand. A mixed dam with a caisson on the mound, or a steel sheet pile has been used.

However, in Japan, there is a shortage of rough stones as a material for rubble stones, and a method for constructing a new type of levee body is sought in order to cope with deep water depth, hydrophilicity, etc., which requires a larger amount of rubble stones. It was being done.

On the other hand, excavation sludge containing water generated by excavation of the ground in shield construction, underground continuous wall construction, etc. is treated as industrial waste unlike ordinary excavated earth and sand, and a disposal site can be secured. It's getting harder.

[0005]

The present invention has been made in view of the above circumstances. Its purpose is to propose a method for constructing breakwaters such as breakwaters and revetments with good work efficiency by using excavated sludge treated as industrial waste as a main material without using rough stones as rubble.

[0006]

[Means for Solving the Problems] The method for constructing this bank is
It is characterized in that a net frame having a net surface is installed on the bottom of the water, and a mixed slurry mainly composed of excavated sludge and solidifying material generated along with excavation of the ground is injected into the net frame.

The mixed slurry is mainly composed of excavated sludge and a solidifying material such as cement, and is appropriately mixed with soil generated by construction, etc., and has fluidity that can be pumped.

This mixed slurry is pressure-fed by a pipe from a work boat or on land to be injected into a net frame installed on the water bottom.

The mesh frame may be assembled on the bottom of the water to retain the desired shape of the bank body, and may have a mesh surface to the extent that the mixed slurry injected as the buried mold does not escape. That is, the net frame may be any one as long as it can prevent contamination of surrounding seawater and the like.

In order to further prevent water contamination, a bag made of an impermeable membrane or a woven fabric having a fine structure is put in the net frame, and a bag having the same size as the net frame is put in the net frame. Every
The mixed slurry may be injected into this bag.

[0011]

In the method of constructing a dam body having the above structure, excavated sludge, which is difficult to dispose, is used as the main material, and the dam body can be constructed without using rough stones. Since the mixed slurry can be pumped and injected, underwater construction is almost unnecessary and work efficiency is high. Since the net frame allows water to circulate, it is easy to set it down, and even if there are some waves and tidal currents, excessive force does not act, it becomes a buried mold and it forms a bank with the solidified body of the mixed slurry, Functions as a reinforcing material.

According to the construction method of the second aspect, since the bag body is put in the net frame and the mixed slurry is injected into the bag body, contamination of surrounding water can be completely prevented. Since the bag is folded before pouring the slurry, it does not hinder the flow of water.

[0013]

EXAMPLES The construction method will be described below with reference to examples.

FIG. 1 shows a process after a net frame 2 is laid on the seabed 1 at a higher height and a mixed slurry 3 containing drilling sludge and cement as a main material is injected therein. The second-layer net frame 2 is laid side by side on the single-layer net frame 2 filled with the mixed slurry 3, and the mixed slurry is pressure-fed into the inside of the work frame (not shown) by using the injection pipe 4. inject.

The steps of installing the net frame and injecting the mixed slurry are sequentially repeated in the upper layer to construct a bank body shown in FIG. The mesh frame 2 used in this example is composed of a mesh body having fine meshes and has a rectangular parallelepiped shape or an obliquely rectangular parallelepiped shape, and the inclined surface is arranged toward the side surface to form an inclined side surface of the bank.

When it is necessary to give special consideration to the pollution of the water area due to the outflow of the mixed slurry, as shown in FIG.
A bag body 5 made of, for example, an impermeable membrane is put in the net frame 2, and the mixed slurry 3 is injected into the bag body 5 to construct a bank. The bag body 5 is sized so as to be in close contact with the inner surface of the net frame 2 when the mixed slurry 3 is injected and expanded. According to this method, industrial waste sludge containing harmful substances can be mixed with the mixed slurry.

FIG. 4 shows an embodiment to which the method for constructing this bank is applied. In this example, the net frame 2 is arranged only on the outer side portion of the dam body, and the middle part is constructed by only pouring the mixed slurry 3 into the net frame 2 arranged on the outer side as a mold. In this case, the injected unsettled mixed slurry 3 in the central portion may be washed by the sea on the upper free surface and contaminate seawater. Therefore, the periphery is surrounded by the pollution prevention film 6 to prevent diffusion. It is also possible to construct a dam body by throwing concrete crushed pieces into the mixed slurry 3 in the central portion.

[0018]

The present invention is as described above, and according to this method of constructing a dam body, it is possible to construct a dam body with good work efficiency without using rough stone, using excavated sludge treated as industrial waste. .

[Brief description of drawings]

FIG. 1 is a side view of a process of constructing a bank body according to an embodiment.

FIG. 2 is a side view of the constructed dam body.

FIG. 3 is an explanatory view of a state in which the mixed slurry is poured into the bag body put in the net frame.

FIG. 4 is an explanatory view showing a state where a net frame is arranged only on the outer side portion and the mixed slurry is injected into the central portion.

[Explanation of symbols]

1 ... sea floor, 2 ... net frame, 3 ... mixed slurry, 4 ... injection pipe,
5 ... bag body, 6 ... contamination prevention film

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yuichi Yoshino 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Shigeru Banno 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Akira Shiki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Eizo Fukasawa 2-19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Center

Claims (2)

[Claims] 1. A mesh frame having a mesh surface is installed on the bottom of the water, and a mixed slurry containing a drilling sludge and a solidifying material as a main material is injected into the mesh frame. How to build a bank. 2. The method for constructing a dam body according to claim 1, wherein the bag body is put in a net frame and the mixed slurry is injected into the bag body.