JPH06228947A - Construction of landslide protection wall in ground filled up with wastes - Google Patents

Abstract

PURPOSE:To make certain execution of work construction possible. CONSTITUTION:A compaction pile row 1 is constructed, with filling material such as sand supplied, to a wastes layer to which a landslide protection wall is to be built, and a soil cement column row 3 is created by injecting solidification agent to the ground around the lower part of the compaction pile row and by stirring up the injected solidification agent, and thereby the landslide protection wall composed of the soil cement column row is constructed. Furthermore, a filling material such as with solidification agent mixed therein is supplied to the wastes layer to which the landslide protection wall is to be built, and the compaction pile row 1 is created. After the pile row is hardened, ditches are excavated to the ground around the lower part of the compaction pile row and to the compaction piloe row. Then, reinforcements are arranged in the ditches and a reinforced concrete landslide protection wall is constructed with concrete placed therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a retaining wall on a landfill site for waste.

[0002]

2. Description of the Related Art A soil cement column wall construction method or a continuous underground wall construction method is used for construction of a water blocking wall. The soil cement column wall is usually constructed by rotating a casing having stirring blades while jetting the solidifying material to mix the soil and the solidifying material. In addition, the continuous underground wall is constructed by excavating a groove in the ground while maintaining the stability of the groove wall with bentonite muddy water, etc., then constructing a rebar cage in this groove and placing a concrete. .

[0003]

Although the above technique can be applied to normal ground without any problems, reliable construction is not possible on waste landfill ground where a large amount of vinyl, wood chips, rubble, etc. are mixed. It was possible. That is, in the case of the soil cement column wall construction method, the waste is entangled with the stirring blades during the rotation of the casing, and the rotation becomes impossible, which makes the construction difficult. Also, even if the casing can rotate,
Due to uneven rotation, it is difficult to create a soil cement column with a predetermined thickness and a predetermined strength. On the other hand, in the case of the continuous underground wall method, it is difficult to excavate a groove having a predetermined width because the waste ground is very fragile. In addition, since the waste layer has extremely high water permeability, bentonite muddy water is easily washed away to the surrounding ground, and it is difficult to keep the groove wall stable.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a method of constructing a mountain retaining wall in a waste landfill site board that enables reliable construction.

[0005]

According to the present invention, in a method of constructing a retaining wall on a landfill site for waste, a filler such as sand is supplied to a waste layer at a place where the retaining wall is to be constructed so as to tighten it. After forming the consolidation pile row, the soil below the compaction pile row and the compaction pile row are agitated while injecting the solidifying material to form the soil cement column row, and the earth retaining wall composed of the soil cement column row is constructed. It is a method of constructing a retaining wall in a landfill site for waste, which is characterized by In addition, in the method of constructing a cliff wall on a landfill site, a compaction pile row is created by supplying a filler such as sand mixed with a solidifying material to the waste layer at the site where the cliff wall is to be constructed. After the compaction pile row has hardened, a groove is excavated in the lower ground of the compaction pile row and in the compaction pile row, and the concrete is laid in this groove and a concrete is placed to reinforce the concrete pile structure. It is a method of constructing a retaining wall in a waste landfill site, which is characterized by constructing a retaining wall.

[0005]

Example 1 This example is an example of constructing a soil cement column wall. <A> Construction of compaction pile (FIGS. 2 to 4) FIG. 2 is a cross-sectional view of the ground in which the waste layer A exists near the surface layer. In the figure, B is the planned excavation range, and C is the construction range of the soil cement column wall. Figure 3 shows a compaction pile 1 in the range C
It shows the process of creating. After compacting the casing 2 with the vibro hammer to the bottom of the waste layer A, the compacting pile 1 supplies the filler such as sand, crushed stone, and soil from the inside of the casing 2 while supplying the casing 2 with the casing 2. Create by moving up and down. In this way compaction waste 1 pile 1
By replacing it with, the waste is pushed to the surroundings, and the surrounding waste layer is compacted.
Further, in order to form the compaction pile 1 in a wall shape, the compaction pile 1 is lapped as shown in FIG. Furthermore, the compaction pile 1 is constructed with a larger cross-sectional area than the soil cement column. Therefore, when the diameter of the soil cement column is large, it is necessary to construct the compaction pile 1 in two or more rows.

<B> Construction of Soil Cement Pillar Column Walls (FIGS. 1 and 5) FIGS. 1 and 5 show a process of constructing a soil cement column 3 in the cross-sectional area of one row of compacted piles that has already been constructed. ing.
The soil cement column 3 is constructed by stirring the lower ground of one row of compaction piles and the one row of compaction piles with the casing 4 having the stirring blades 41 while injecting the solidifying material. At this time, the soil cement columns 3 are wrapped and constructed in a wall shape. By constructing the soil cement columns 3 in the compacted cross-sectional area of the pile 1 in this manner, waste such as vinyl is not entangled with the stirring blades 41, so that smooth construction is possible. After the soil cement pillar 3 is constructed, the core material 31 such as H steel is built and reinforced before the solidified material is hardened.

[0007]

[Embodiment 2] This embodiment is an embodiment for constructing a continuous underground wall. <A> Construction of compaction pile (FIGS. 6 and 7) The compaction pile 5 is constructed in the waste layer A at the planned construction site of the continuous underground wall by the same method as in the above-described embodiment. However, for the compaction pile 5, a filler such as sand mixed with a solidifying material in advance is used. Further, the compaction piles 5 are formed in two or more rows if necessary as shown in FIG. 7 so as to have a width larger than the excavation groove width.

<B> Excavation of groove (FIGS. 8 and 9) After the row of compaction piles 5 is hardened, the groove 6 is excavated in the lower ground of the row of compaction piles 5 and the row of compaction piles 5 by a known method. .
At this time, the groove 6 is excavated within the cross-sectional area of the 5 rows of compaction piles.
Therefore, since the groove 6 is surrounded by the hardened wall surface, collapse of the groove wall can be prevented.

<C> Construction of a continuous underground wall (Fig. 10) After excavation of the groove 6, a rebar cage 7 etc. is built in the groove 6 and a concrete 8 is driven to construct a continuous underground wall. Complete.

[0010]

Since the present invention is as described above, the following effects can be obtained. <a> By constructing compacted piles in the waste layer before constructing the soil cement column wall and continuous underground wall, the problems such as the inability to rotate the casing and the collapse of the groove wall, which have been problems in the past, have been solved. Problems can be resolved and reliable construction becomes possible.

<B> The waste layer is extremely fragile like a sponge, but since the surrounding ground can be compacted and strengthened by forming compaction piles, it is possible to excavate inside the mountain retaining wall. It is possible to prevent the stop wall from being deformed.

[Brief description of drawings]

1] Plan view of the construction process of soil cement column wall

[Figure 2] Explanatory drawing of the planned excavation section

[Fig. 3] An explanatory diagram of a process for forming a compaction pile

FIG. 4 is an explanatory diagram of a compaction pile row.

FIG. 5: Side view of construction process of soil cement column wall

FIG. 6 is a side view of a process for forming a compaction pile in which a solidifying material is mixed.

FIG. 7 is a plan view of a process for forming a compaction pile in which a solidifying material is mixed.

FIG. 8 is a plan view of a trench excavation process.

FIG. 9 is a side view of the trench excavation process.

[Figure 10] Illustration of the continuous underground wall construction process

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[Procedure amendment]

[Submission date] March 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

<B> Construction of soil cement column wall (FIGS. 1 and 5) FIGS. 1 and 5 show the cross section of one row of compacted piles already formed,
The process of constructing the soil cement pillar 3 is shown. The soil cement column 3 is constructed by stirring the lower ground of one row of compaction piles and one row of compaction piles by the casing 4 having the stirring blades 41 while injecting the solidifying material. At this time, the soil cement columns 3 are wrapped and constructed in a wall shape. By constructing the soil cement columns 3 in the compacted section of the pile 1 in this way, waste such as vinyl is not entangled with the stirring blades 41, so that smooth construction can be performed. After the soil cement pillar 3 is constructed, before the solidifying material is hardened, H
A core material 31 such as steel is built and reinforced.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

<B> Excavation of Grooves (FIGS. 8 and 9) After 5 rows of compaction piles have hardened, a groove 6 is excavated in the lower ground of the 5 rows of compaction piles and 5 rows of compaction piles by a known method. .
At this time, the groove 6 is excavated in the cross section of the compaction pile 5 rows. Therefore, since the groove 6 is surrounded by the hardened wall surface, collapse of the groove wall can be prevented.

Claims (2)

[Claims] 1. A method for constructing a cliff wall on a waste landfill site, which comprises supplying a filler such as sand to a waste layer at a place where the cliff wall is to be constructed to form a compacted pile row, The bottom ground of the compacted pile row and the compacted pile row are stirred while injecting the solidifying material to form a soil cement column row, and a mountain retaining wall composed of the soil cement column row is constructed. Method of constructing a retaining wall on a landfill site. 2. A method of constructing a cliff wall on a landfill site for waste, comprising supplying a filler such as sand mixed with a solidifying material to a waste layer at a site where the cliff wall is to be constructed and compacting the pile column. After the compaction pile row has hardened, a groove is excavated in the lower ground of the compaction pile row and in the compaction pile row, and the concrete is placed in this groove and the concrete is placed to reinforce the concrete. A method of constructing a mountain retaining wall in a landfill site for waste, which is characterized by constructing a mountain retaining wall.