JPH0641942A - Driving method for drain member - Google Patents

Abstract

PURPOSE:In the case where the ground is improved using a drain member before and after underground excavation, to make the excavating work more effective without hindrance caused by the drain member in the excavation work. CONSTITUTION:A drain member 1 connected through a synthetic resin connecting member 2 which is cut to proper length and can be cut under low tensile force, namely 30 to 50kgf, is driven to a prescribed depth in the soft ground M. After that, the tensile force is applied to the drain member 1 on the ground surface to cut it for driving it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for placing a drain material.

[0002]

2. Description of the Related Art The drainage method adopted as a liquefaction preventing method for soft ground such as sandy ground includes a method using crushed stone and a method using a drain material made of an artificial synthetic resin material. The latter construction method includes a construction method in which the drain material is cut to a certain length for construction, and a construction method in which a continuous drain material is used to improve construction efficiency. The construction method using this drain material is to place a continuous drain material from the ground surface of the ground to a set depth by press-fitting construction method.

On the other hand, in order to prevent liquefaction immediately below or around a structure that involves underground excavation, if the excavation work is small, it is possible to improve the ground after the excavation. If accompanied, it is necessary to improve the ground before excavation. In such a case, the construction method using the crushed stone as described above can be performed by blank driving up to the excavated surface.

[0004]

However, when the drain material is used in the above case, the drain material is continuously cast from the ground surface portion to the set depth in order to cut the ground material at the ground surface portion after the drain material is placed on the ground. Will exist. When the underground excavation is performed as described above, this drain material interferes with the excavation work, and the workability cannot be improved. The present invention has been made in view of the above problems, and an object thereof is to carry out underground excavation, and when performing ground improvement using a drain material before or after the excavation, the drain material is It is an object of the present invention to provide a method for placing a drain material that can improve the efficiency of excavation work without hindering the excavation work.

[0005]

Means for Solving the Problems The gist of the present invention for solving the above problems is to provide a drain member which is cut to an appropriate length and which is connected by a connecting member which can be cut with low tension. After placing to the set depth of soft ground, applying tension to the drain material on the ground surface and cutting and placing it in the underground part, drain material of an appropriate length from the planned excavated bottom surface of soft ground It consists in setting up to the set depth.

[0006]

According to the method for driving a drain material of the present invention, even when the drain material is driven from the ground surface portion, a predetermined tension is applied to the drain material at the ground surface portion after the driving operation in the underground portion. By cutting the drain material and by driving the drain material from the planned excavation bottom surface to the set depth in advance, the drain material can be driven from the set depth to the excavation depth. Underground drilling can be done without it.

An embodiment of the present invention will be described below in more detail with reference to the drawings. The first embodiment will explain a placing method using a band-shaped drain material which is preliminarily divided into predetermined lengths and which are continuous with a connecting material which can be cut with low tension. (1), (2), and (3) of FIG. 1 are perspective views of the strip-shaped drain material previously connected with a connecting material, FIG. 2 is a plan view of the strip-shaped drain material with a part of the woven cloth removed, and FIG. Side view, FIG.
Is a longitudinal sectional view of the same, and FIG. 5 is a sectional view taken along line AA of FIG.

In the drain material 1 of the present invention, as shown in FIG. 1, the band-shaped drain material 1a having an appropriate length is 30 to 50 kgf.
Is formed by being connected by a connecting material 2 such as a synthetic resin material which can be cut with low tension. As shown in (1) of FIG. 1, this connection is made by connecting the cap 1b to the end portion of one strip-shaped drain material 1a.
In which the ends of both strip-shaped drain members 1a are hermetically sealed by heat-sealing the filter member 1c as shown in (2) of FIG. As shown in 3), there is a case in which the cap 1b is fitted only to the end portion of the one strip-shaped drain material 1a and is joined by the wire 1d. The length of the strip-shaped drain material 1a is set in advance to the length from the set depth to the excavation bottom surface.

As shown in FIG. 2, the strip-shaped drain material 1a is
It is made of a synthetic resin such as vinyl chloride or polyethylene, and its cross-section has a substantially rectangular shape, and the wide surfaces facing each other have water-permeable plate surfaces 3a.
And the nonwoven fabric 4 covering the surface of the water-permeable material 3.

A plurality of water passages 3b which are continuous in the longitudinal direction are partitioned by ribs 3c in the water passage member 3 and are fixedly provided side by side in the width direction. Further, a large number of grooves 3d along the width direction are formed on both water-passing plate surfaces 3a, and the grooves 3d are formed so as to depend on each other in the longitudinal direction of both water-passing plate surfaces 3a. Water passages 3e communicating with the water passage 3b are continuously formed along the longitudinal direction of the groove 3d.

As shown in (1) of FIG. 6, the drain material 1 is cast on the reel 5 by winding the drain material 1 as described above.
Is pulled into the mandrel 6. Then, as shown in (2) and (3) of the same figure, after attaching the anchor plate to the lower end of the drain material 1, the mandrel 6 is statically press-fitted to the set depth. Next, as shown in (4) of the figure, when the mandrel 6 reaches the set depth, the mandrel 6 is pulled out to the cutting position of the drain material 1 while operating the co-raising prevention device at the tip of the mandrel 6. After pulling up, when a tension of about 50 kgf is applied to the drain material 1 on the ground portion, the drain material 1 on the ground surface portion is cut at the connection portion.

Then, as shown in (5) of the figure, when it is confirmed that the strip-shaped drain material 1a is cut in the ground, the mandrel 6 is pulled up to the ground to strike the strip-shaped drain material 1a from the set depth to the bottom of the excavation. Set up. By repeating the above-mentioned placing work in sequence, the soft ground M
The strip-shaped drain material 1a is placed therein at predetermined intervals.
As described above, in the case of using the drain material 1 in which the belt-shaped drain material 1a having an appropriate length is connected by the connecting material 2, the belt-shaped drain material 1a can be continuously placed, so that work efficiency is improved. You can

In the second embodiment, the strip-shaped drain material 1a having an appropriate length is not previously connected by the connecting material 2 as described above, but the continuous drain material 1 is cut and connected each time it is driven. The drain material 1 is placed in the same manner as in the first embodiment, except for the cutting and connecting process. In this connection / disconnection process, the drain material 1 is pulled into the mandrel 6 and then pulled out from the lower end of the mandrel 6.

Then, the drain member 1 is cut to a required length, that is, a length from the set depth to the bottom of the excavation, and a cap 1b is fitted to the tip of one band-shaped drain member 1a as shown in (1) of FIG. In this case, these are connected by a connecting material 2 such as a synthetic resin material that can be cut with a tension of 30 to 50 kgf. Further, the connection / disconnection processing is not limited to the above-mentioned method, and it is of course possible to perform the processing shown in (2) and (3) of FIG.

Next, according to the driving method of the third embodiment, as shown in (1) to (3) of FIG. 7, the drain material 1 has a required length in advance, that is, the length from the set depth to the excavated bottom surface. In order to prevent soil and sand from being mixed in, the filter 1c is heat-sealed or the cap 1b is fitted, as shown in (2) and (3) of FIG. Then, the wire 1d is connected by the bonding material 2 such as a synthetic resin material.

Then, the strip-shaped drain material 1a is drawn into the mandrel 6, an anchor plate is attached to the lower end thereof, and the mandrel 6 is press-fitted to a set depth.
Next, after confirming the press-fitting of the strip-shaped drain material 1a to the set depth, the mandrel 6 is pulled out and pulled up to the ground while operating the co-raising prevention device at the tip of the mandrel 6, and then tension is applied to the wire 1d to synthesize the wire. By cutting the bonding material 2 such as a resin material, the strip-shaped drain material 1a is driven from the set depth to the excavation bottom surface. By repeating such a placing operation in sequence, the strip-shaped drain material 1a is placed in the soft ground at predetermined intervals. Further, 5 in FIG. 7 is a reel for the drain material, and 7 is a reel for the wire 1d.

In the above first and third embodiments,
As the drain material 1, all band-shaped drain materials 1a were used.
The present invention is not limited to this band-shaped drain material 1a, but a circular drain material can of course be used.

[0018]

EFFECTS OF THE INVENTION After the drain material, which is cut to an appropriate length and connected by a connecting material that can be cut with low tension, is driven to the set depth of soft ground, tension is applied to the drain material on the ground surface. In addition, by cutting and placing in the underground part, the drain material is placed from the set depth to the bottom of the excavation, so there is no drain material in the excavated ground, that is, the underground material is not disturbed and underground excavation is performed. be able to.

Since the drain material is placed by the static press-fitting method, it is possible to perform the construction without vibration and noise without disturbing the original ground.

Since the drain material can be cut by applying a low tension after it is placed, it is possible to carry out the placing operation continuously and improve the efficiency.

[Brief description of drawings]

FIG. 1 (1) to (3) are perspective views of a drain member in which strip-shaped drain members of appropriate length are connected by a connecting member.

FIG. 2 is a plan view of a strip-shaped drain member in which a woven cloth is partially cut away.

FIG. 3 is a side view of a strip-shaped drain member in which a woven cloth is partially cut away.

FIG. 4 is a vertical sectional view of a strip-shaped drain material.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view of a method for driving a drain material on soft ground in the first and second embodiments.

FIG. 7 is a cross-sectional view of a method for driving a drain material on soft ground in the third embodiment.

[Explanation of symbols]

 1 Drain material 1a Band-shaped drain material 2 Connection material M Soft ground

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[Procedure amendment]

[Submission date] August 19, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

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[Procedure Amendment 2]

[Document name to be corrected] Drawing

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[Figure 4]

[Procedure 3]

[Document name to be corrected] Drawing

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[Figure 5]

Front page continuation (72) Inventor Ayumu Tanaka 14 Chidori-cho, Ichikawa-shi, Chiba Goei Industrial Co., Ltd. Ichikawa Sales Office

Claims (2)

[Claims] 1. A drain material, which is cut to an appropriate length and connected by a connecting material that can be cut with low tension, is driven to a set depth of soft ground, and then tension is applied to the drain material on the ground surface. In addition, the method for placing a drain material is characterized by cutting and placing in the underground portion. 2. A method of driving a drain material, which comprises driving a drain material having an appropriate length from a planned bottom surface of soft ground to a set depth.