JP2686445B2 - Soil cement water blocking wall construction method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method for constructing a soil cement water blocking wall and an apparatus for constructing the same.

<Prior Art> A soil cement water blocking wall is one that constructs a water blocking wall by mixing mud and Portland cement or blast furnace cement in a groove formed in the ground and curing the mixture.

Conventionally, a construction method called a so-called shuttle construction method has been used to construct the water blocking wall.

In the shuttle method, first, a column row pile is pre-drilled with a device dedicated to drilling at equal intervals to the ground.

Next, by using a stirring drilling device with three vertical auger screws in parallel, the undrilled ground between the above pillar row piles is drilled backward with the central auger screw, and at the same time, inside the pillar row piles on both sides. The mud of is stirred while pouring cement.

Then, mud and cement are mixed and hardened to construct a soil cement water blocking wall.

<Problems to be Solved by the Present Invention> The conventional construction techniques for soil cement water blocking walls as described above have the following problems.

<B> When the undrilled ground between the pillar rows is to be drilled subsequently, the auger screw in the center of the stirring drilling device is used for drilling.

However, it is difficult for the auger screw to crush the boulders and boulders in the ground.

Therefore, when building a pile core material such as H steel in a pillar row pile, cement with a large specific gravity is settled at the bottom of the pile, and while the boulders are floating, the boulders floating by the pile core material are separated and built up. I was out.

 Therefore, the work is inevitably complicated.

In addition, if it takes time to drill a pillar row pile, floating boulders will sink to the bottom of the pile.

Therefore, when the pile core material is built in, the lower end of the pile core material is placed on a boulder or the like, does not reach the pile bottom, and causes re-drilling of the pile bottom.

<B> In addition to the agitation drilling device in which three auger screws are arranged in parallel, a dedicated drilling device for preceding drilling is required, which is uneconomical.

<Purpose of the present invention> The present invention has been made to solve the above problems, it is possible to crush the rocks and cobblestone layers in the ground at the time of both preceding and trailing boring, and An object of the present invention is to provide a method for constructing a soil cement water-blocking wall and a device therefor, in which one drilling device can be commonly used for leading and trailing drilling.

<Means for Solving the Problems> That is, the present invention, in a rotatable outer tube having a drilling claw at the tip, by a drilling device having a screw inserted, the pillar row piles at equal intervals to the ground. Drilling, filling muddy water in this pillar row pile, installing the drilling device in the center, by a triple drilling stirring device having a stirring device and a cement injection device on both sides thereof, At the same time as drilling the undrilled ground between the pillar row piles by a hole drilling device, the mud in the column row piles on both sides of the hole drilling device is stirred by a stirring device while injecting cement, and the mud and the cement. Is a method for constructing a soil cement water blocking wall, which comprises mixing and curing the above to construct a wall body.

Further, the present invention is a device used in the method for constructing the soil cement water blocking wall, wherein a rotatable outer tube having a hole-piercing claw at the tip, a hole-piercing device having a screw inserted thereinto
The part to which this drilling device is attached, the stirring parts on both sides of it,
The soil cement water blocking wall construction device is characterized by being configured with a stirring device including a cement injection part provided in the stirring part.

<Description of the Present Invention> The present invention will be described in detail below.

<A> Structure of Drilling Device (FIGS. 1 and 2) The drilling device 1 includes an outer pipe 2 and an inner screw 3 inserted in the outer pipe 2.

The outer tube 2 has a drilling claw 21 at the tip that can crush boulders or boulders.
Having.

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

Further, when the inner screw 3 is rotated, a cement milk injection path 31 is provided, and the injection path 31 is opened at the lower end of the inner screw 3 and serves as an injection port 32.

Then, a driving device (not shown) is attached to the upper portions of the outer tube 2 and the inner screw 3, and the outer tube 2 and the inner screw 3 are attached.
Are configured to rotate in opposite directions to drill holes.

<B> Stirrer structure (Figs. 1 and 3) The stirrer 4 is a casing in which the pipe body is vertically raised.
41 is arranged in the center of the device, and hydraulic motors 43 are attached to both sides of the device via connecting plates 42.

The inner diameter of the casing 41 is formed to be slightly larger than the outer diameter of the outer pipe 2 of the drilling device 1, so that the drilling device 1 can be mounted in the casing 41.

Further, the casing 41 also serves as a guide pipe at the time of drilling, and thus is formed of a rigid member.

A rotary shaft 45 having a plurality of stirring blades 44 attached thereto 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 portion of this hollow hole communicates with an injection pipe 47 for injecting cement milk through the swivel 46, and the lower end portion of the hollow hole rotates. The lower end of the shaft 45 is opened to serve as an injection port 48.

<C> Pre-drilling of pillar row piles (Fig. 4) Next, a method for constructing a soil cement water blocking wall using the apparatus configured as described above will be described.

First, the drilling device 1 separated from the agitation device 4 drills the column piles 5 at an equal interval to the ground to remove the soil.

At this time, muddy water 6 is filled in the pillar row pile 5 to prevent the pile wall from collapsing.

<D> Trailing Drilling of Pillar Piles (Figs. 5 and 6) Next, the drilling device 1 is mounted in the casing 41 of the stirring device 4, and a triple drilling stirring device is assembled.

The hole boring device 1 mounted at the center of the device starts boring of the undrilled ground between the column piles 5.

At this time, the rotary shaft 45 of the stirring device 4 is inserted into the pillar row piles 5 on both sides of the hole drilling device 1.

Simultaneously with the drilling, while the cement milk is being injected into the column row piles 5 on both sides of the hole making apparatus 1 from the inlets 32 and 48, the mud in the column row piles 5 is stirred by the stirring blades 44.

Mix and mix the mud and cement in the pillar row pile 5,
Knead soil cement 7.

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

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

<B> Conventionally, since the auger screw is used for the subsequent drilling, it is difficult to crush the boulders and cobblestone layers in the ground, and it is inevitable that the work of building the pile core material becomes complicated.

In addition, the pile core material cannot be built correctly, which causes re-drilling of the pile bottom.

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

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

Therefore, the pile core material only needs to be built in the pile as it is, and the building work can be performed easily and accurately.

 Also, it is not necessary to re-drill the bottom of the pile.

<B> Conventionally, it is uneconomical since a drilling device dedicated to the preceding drilling is required in addition to the stirring drilling device in which three auger screws are arranged in parallel.

In contrast, the present invention allows a separate drilling device to be integrated with the agitator.

Therefore, one drilling device can be commonly used for leading and trailing 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 misaligning the holes and improve the drilling accuracy of the pile.

<D> Even on normal ground without boulders, etc., the drilling accuracy of the pile is improved, and therefore the waterproofness is improved.

[Brief description of the drawings]

 Fig. 1: Explanatory diagram of the device of the present invention Fig. 2: Explanatory diagram of the boring device Fig. 3: Explanatory diagram of the stirring device Fig. 4: Explanatory diagram showing the construction method of the pre-drilling process Fig. 5: Trailing Explanatory drawing showing construction method of drilling Fig. 6: Explanatory drawing of completed state of water blocking wall

Claims (2)

(57) [Claims] 1. A column row pile is drilled at an interval equal to the ground by a hole drilling device having a screw inserted in a rotatable outer tube having a hole drilling claw at its tip. Is filled with muddy water, the hole drilling device is installed in the center, and a triple hole drilling and stirring device having a stirring device and a cement injection device on both sides of the drilling device At the same time when the ground is drilled by the drilling device, the mud in the pillar piles on both sides of the drilling device is agitated by the stirring device while injecting cement, and the mud and cement are mixed and hardened to form the wall. A method for constructing a soil cement water blocking wall, characterized by being constructed. 2. A device used in the method for constructing a soil cement water blocking wall according to claim 1, wherein a screw is inserted into a rotatable outer tube having a hole-piercing claw at its tip, and The part where the drilling device is installed, and the stirring parts on both sides of it.
An apparatus for constructing a soil cement waterproof wall, which is configured by a stirring device including a cement injection part provided in this stirring part.