JPH0396514A - Soil cement cut-off wall construction method and device thereof - Google Patents

Abstract

PURPOSE:To make it possible to easily and accurately construct a cut-off wall by excavating a hole in the ground having no excavated hole between column piles by a hole excavation device and, at the same time, stirring mud in the column piles of both sides while pouring cement thereinto by a stirring device, and mixing and solidifying the mud and cement. CONSTITUTION:In a hole excavation device 1, a screw is internally put in an external pipe 2 capable of rotation having a hole excavation claw 21 to the end, the external pipe 2 is rotated in the opposite direction each other to excavate a hole. In a stirring device 4, hydraulic motors 43 are mounted to both sides of a casing 41, and rotary shafts 45 having a pluralilty of stirring blades 44 are connected to the casing 41 in parallel so that they are capable of rotation. First of all, column piles excavate holes antecedently in the ground by the hole excavation device 1 separated from the stirring device 4, the, the hole excavation device 1 is loaded to the inside of the casing 41, and a three throw type hole excavation and stirring device is built up to excavate holes in the ground having no excavated hole between the column piles. Simultaneously, mud in the column piles of both sides is stirred together with cement, and it is mixed and solidified to construct a wall.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for constructing a soil cement water-stop wall and an apparatus for constructing the same.

<Prior Art> Soil cement water-stopping walls are constructed by mixing mud and boltland cement, blast furnace cement, or the like into a trench drilled in the ground and hardening the mixture to form a water-stopping wall.

Conventionally, a construction method called the so-called shuttlee method has been used to construct this ice wall.

In the shuttlee method, first, a column pile is pre-drilled at equal intervals in the ground using a special drilling device.

Next, using an agitation drilling device with three vertical august screws arranged in parallel, the undrilled ground between the pillar row piles is drilled backward by the central auger screw. of mud is stirred while pouring cement.

Then, mud and cement are mixed and hardened to construct a soil-cement waterstop wall.

<Problems to be Solved by the Present Invention> The following problems exist in the conventional soil cement water stop wall construction technology as described above.

<B> When drilling holes in the undrilled ground between the columns of piles, the holes will be drilled using the auger screw in the center of the stirring drilling device.

However, with an auger screw, it is difficult to crush boulders and cobblestone layers within the ground.

Therefore, when installing pile core material such as Hjll in column piles, cement with a high specific gravity is precipitated at the bottom of the pile, and with the boulders, etc. floating, the pile core material is used to push aside the floating boulders, etc. there was.

Therefore, it is unavoidable that the work becomes complicated.

Additionally, if it takes a long time to drill holes in column piles, floating stones and the like will sink to the bottom of the piles.

Therefore, when the pile core material is erected, the lower end of the pile core material is placed on boulders, etc., and does not reach the pile bottom, causing re-drilling of the pile bottom.

<Mouth> In addition to an agitation drilling device with three auger screws arranged in parallel, a drilling device exclusively for preliminary drilling is required, which is uneconomical.

<Objective of the present invention> The present invention was made to solve the above-mentioned problems, and is capable of crushing boulders and cobblestone layers in the ground during both preceding and subsequent drilling. An object of the present invention is to provide a method for constructing a soil cement water stop wall and an apparatus therefor, in which one drilling device can be used in common for both preceding and subsequent drilling.

<Means for Solving the Problems> That is, the present invention uses a drilling device in which a screw is inserted into a rotatable outer tube having a drilling claw at the tip to drill column piles at equal intervals in the ground. Holes are drilled and muddy water is filled in the columnar piles, and a triple drilling and stirring device is used, which has the hole drilling device installed in the center and a stirring device and a cement injection device on both sides. At the same time, the undrilled ground between the column piles is drilled by a drilling device, and at the same time, the mud in the column piles on both sides of the hole drilling device is stirred by a stirring device while cement is injected, and the mud and cement are mixed. This is a method for constructing a soil-cement water-stop wall, which is characterized by mixing and curing the soil cement water-stop walls and constructing the wall body.

The present invention also provides a device for use in the method for constructing a soil cement water stop wall, which includes a screw inserted into a rotatable outer tube having a hole-drilling claw at the tip; This is a soil cement water stop wall construction device characterized by comprising a mounting part, a stirring part on both sides thereof, and a stirring device consisting of a cement injection part provided in the stirring part.

<Description of the present invention> The present invention will be explained in detail below.

<A> Structure of the hole drilling device (FIGS. 1 and 2) The hole drilling device 1 consists of an outer tube 2 and an inner screw 3 inserted into the outer tube 2.

The outer tube 2 has a drilling claw 21 at its tip that can crush boulders, cobblestones, etc.
has.

The inner screw 3 uses a known auger screw or the like,
It has a screw diameter that can be inserted into the outer tube 2.

Further, the rotation shaft of the inner screw 3 is provided with an injection path 31 for cement milk, and the injection path 31 opens at the lower end of the inner screw 3 and serves as an injection port 32 .

A driving device (not shown) is attached to the upper part of the outer tube 2 and the inner screw 3, and the outer tube 2 and the inner screw 3 are connected to each other.
The configuration is such that the holes are drilled by rotating in opposite directions.

<Port> Structure of the stirring device (Figs. 1 and 3) The stirring device 4 is a casing 4 with a vertical tube.
1 is placed in the center of the device, and hydraulic motors 43 are attached to both sides of the motor via connecting plates 42.

The inner diameter of the casing 41 is slightly larger than the outer diameter of the outer tube 2 of the drilling device 1, and the drilling device 1 is installed inside the casing 41.
be configured so that it can be installed.

The casing 4l also serves as a guide tube during drilling, and is therefore formed of a rigid member.

A rotary shaft 45 to which a plurality of stirring blades 44 are attached is rotatably connected to the hydraulic motors 43 on both sides in parallel with the casing 41 .

Further, the rotating shaft 45 has a hollow hole, the upper end of the hollow hole communicates with an injection pipe 47 for injecting cement milk via a swivel 46, and the lower end of the hollow hole communicates with an injection pipe 47 for injecting cement milk.
An injection port 48 is opened at the lower end of the rotating shaft 45 .

<C> Preliminary drilling of column piles (Fig. 4) Next, a method for constructing a soil cement water cutoff wall using the apparatus configured as described above will be described.

First, the column piles 5 are pre-drilled at equal intervals in the ground using the drilling device 1, which is separate from the stirring device 4, and the soil is removed.

At this time, the column piles 5 are filled with muddy water 6 to prevent the pile walls from collapsing.

<2> Backward drilling of columnar piles (Figures 5 and 6) Next, the drilling device 1 is installed in the casing 41 of the stirring device 4, and a triple-type drilling and stirring device is assembled.

Drilling of undrilled holes in the ground between the rows of piles 5 is started using the drilling device 1 mounted at the center of the device.

At this time, the rotating shaft 45 of the stirring device 4 is inserted into the column piles 5 on both sides of the drilling device 1.

Simultaneously with drilling, cement milk is injected into the column piles 5 on both sides of the drilling device 1 from the injection ports 32 and 48, and the mud in the column piles 5 is stirred by the stirring blades 44.

The mud and cement in the column piles 5 are thoroughly stirred and mixed, and fill cement 7 is kneaded.

Then, the fill cement 7 is cured and hardened to complete the construction of the soil cement water stop wall 8.

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

<B> Conventionally, trailing drilling is performed using an Augustalyu, which makes it difficult to crush the boulders and cobblestone layers in the ground, making it unavoidable that the work of erecting the pile core material becomes complicated.

In addition, the pile core material cannot be installed accurately, resulting in re-drilling of the bottom of the pile.

On the other hand, the present invention uses a drilling device consisting of an outer tube such as a donut auger and an inner screw for both the leading and trailing holes.

Therefore, even during backward drilling, it is possible to crush boulders and cobblestone layers in the ground.

Therefore, the pile core material only needs to be inserted directly into the pile.
Construction work can be performed easily and accurately.

Also, there is no need to re-drill holes at the bottom of the pile.

<Exposure> Conventionally, in addition to a stirring drilling device in which three Augusta Lius are arranged in parallel, a drilling device exclusively for advance drilling is required, which is uneconomical.

In contrast, the present invention allows an independent drilling device to be integrated into the stirring device.

Therefore, one drilling device can be used for both preceding and subsequent drilling, which is economical.

<C> Since the casing for mounting the hole-drilling device has rigidity, it is possible to prevent the hole-drilling device from slipping, and the accuracy of drilling the pile is improved.

<2> Even on ordinary ground without boulders, etc., the accuracy of drilling holes in piles is improved, so water-stopping properties are improved.

[Brief explanation of drawings]

Fig. 1 2 An explanatory diagram of the device of the present invention Fig. 2: An explanatory diagram of the drilling device Fig. 3: An explanatory diagram of the stirring device Fig. 4: An explanatory diagram showing the construction method for preliminary drilling Fig. 5: Subsequent drilling Explanatory diagram showing the drilling method. Figure 6: Explanatory diagram of the completed ice wall. Figure I. Figure 2. Figure 4. Figure 5.

Claims (2)

[Claims] (1) Holes are drilled into column piles at equal intervals in the ground using a drilling device in which a screw is inserted into a rotatable outer tube with a drilling claw at the tip. The undrilled ground between the rows of piles is filled with a triple drilling and stirring device, which is equipped with the hole-drilling device in the center and has a stirring device and a cement injection device on both sides. At the same time as the hole is drilled by the hole drilling device, the mud in the column piles on both sides of the hole drilling device is stirred by the stirring device while cement is injected, and the mud and cement are mixed and hardened to construct the wall. A method for constructing a soil-cement water-stop wall, which is characterized by: (2) A device used in the method for constructing a soil cement water-stop wall according to claim 1, which includes a screw inserted into a rotatable outer tube having a hole-drilling claw at the tip; , the part where this hole-drilling device is attached, and the stirring parts on both sides of it,
A device for constructing a soil cement water stop wall, which is composed of a stirring device consisting of a cement injection section installed in this stirring section.