JPH09279569A - Construction method of water stopping land slide protection wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance economical efficiency by constructing a land slide protection wall by contacting a pile and a pile with other in a water stop unnecessary depth directional section, and constructing the land slide protection wall by partially superposing cross sections of the pile and the pile on each other in a water stop necessary section. SOLUTION: In an earth's surface side clay layer composed of the water impermeable ground, excavation is performed still in a diameter of a screw head arranged on the tip of a rotary rod. Cement milk or mortar is delivered from the tip of a pipe arranged inside of the rotary rod, and is mixed with surrounding earth and sand, and a column-rowed land slide protection wall of soil cement or mortar is constructed in a condition where a pile and a pile are contacted with each other. When reaching a water permeable sand layer by penetrating through a clay layer, excavation is performed by expanding an expansible blade having a diameter larger than the screw head. The cement milk or the like is delivered from the tip of a pipe arranged inside the rotary rod, and is mixed with surrounding earth and sand, and the column-rowed land slide protection wall of soil cement or the like is constructed in a condition where cross sections of a pile and a pile are partially superposed on each other.

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 waterproof still mountain wall.

[0002]

2. Description of the Related Art A conventional column-type waterproofing mountain retaining wall is a method of constructing a wall surface by arranging a large number of piles in a state of being piled up by a certain size. In this construction method, the diameters of the piles were the same from the head to the tip, and piles were constructed by stacking adjacent piles on all cross sections.

[0003]

However, looking at the actual state of sedimentation of the stratum, the sandy soil and the cohesive soil are often in alternating layers, and the flow of groundwater is mainly due to the sandy soil. It is a layer. Therefore, it is mainly the sandy soil layer where groundwater flows that needs to make the retaining wall highly waterproof.
However, the diameter of all known Yamadome walls is constant,
Since it is a method of constructing the same size by stacking it with adjacent piles over the entire length, it was uneconomical to construct a water stop wall even in a cohesive soil layer where it is not necessary to construct a water stop wall.

The present invention has been made in order to solve the above-mentioned conventional problems, and is an economical stopping method in which a waterproofing retaining wall can be constructed only in a portion where waterproofing is required. The purpose is to provide a method of constructing a Mizuyama retaining wall.

[0005]

In order to achieve the above-mentioned object, a method of constructing a waterproofing mooring wall of the present invention is to construct a mooring wall by arranging a large number of piles adjacent to each other in the ground. In the depth direction section that does not require water stoppage, the pile and pile are contacted to construct a mountain retaining wall, and in the depth direction section where water stoppage is required, piles and piles It features a method of constructing a waterproofing mountain retaining wall by partially overlapping the cross sections of the above to construct a mountain retaining wall.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for constructing a waterproof still mountain wall according to the present invention will be described below with reference to the drawings.

<A> Equipment used. The construction method of the present invention uses a drilling device as shown in FIGS. That is, the screw head 12 is provided at the tip of the rotating rod 1, and the screw 11 is attached to the outer periphery of the rotating rod 1. An enlarged blade 13 having a diameter larger than that of the screw head 12 is attached between the front screw head 12 and the rear screw 11. This expansion wing has its base end attached to the rod 1 by a pin 14. The expansion wings 13 are normally folded in parallel with the rod 1. When necessary, the expanding blade 13 is rotated by 90 degrees about the pin 14 by supplying hydraulic pressure or another method. Then, the expansion wings 13 project toward the outer periphery,
This is a device capable of making a hole having a diameter larger than that of the screw head 12. It should be noted that a pipe 15 for pumping the curing agent is pierced into the inside of the rotary rod 1 and cement milk or mortar is discharged from the vicinity of the tip toward the outside and mixed with the surrounding earth and sand to form a column of soil cement or mortar. The process of constructing the mountain retaining wall is similar to the known method.

<B> Target ground. As mentioned above, the ground that is the target of the construction method of the present invention,
It is a ground in which permeable layers and impermeable layers are alternately present, such as sandy soil and cohesive soil in alternate layers. In such a ground, it is a method of constructing a column-row mountain retaining wall by adjoining many piles in the ground.

<C> A section in the depth direction of the impermeable layer. The mountain retaining wall is constructed using the above-described drilling device, and it is known from the boring in advance that the depth of the section in the depth direction where the clay layer and the sand layer exist.
For the sake of simplicity, an explanation will be given by taking as an example a ground in which clay layers are present on the surface side, sand layers are in the middle, and clay layers are alternately present below.
(Fig. 1) Since the clay layer on the ground side is impermeable, it is not necessary to build it by stacking adjacent piles. Therefore, the diameter of the screw head 12 at the tip is excavated without using the enlarged blade 13 of the hole drilling device. In this way, in the section in the depth direction that does not require water shutoff, the pile retaining wall is constructed in a state where the pile and the pile are in contact with each other at a contact point or slightly overlapped with each other within a range equal to the diameter of the screw head 12. To do.
Therefore, in this range, the waterproofness is poor and it is possible to construct a column-row mountain retaining wall that can bear only earth pressure.

<D> A section in the depth direction of the permeable layer. When the clay layer is penetrated to reach the sand layer, the columnar mountain retaining wall is required to have water stoppage in this section. For this reason, the expanding blade 13 having a diameter larger than that of the screw head 12 is expanded by the action of hydraulic pressure or the like at the stage when the section in the depth direction where water stopping is required is reached. Then, holes will be drilled to the range of the adjacent piles, and the cross-section of the piles and the piles can construct a water-stopping column-row mountain retaining wall with a part of them being overlapped. In the pile group described above, core materials such as H steel and concrete piles are inserted inside to complete the construction of the column-row retaining wall. In this way, in the depth direction of the pillar row mountain retaining wall, it is possible to freely select and construct only an arbitrary section as a column row mountain retaining wall having water stopping ability and other sections as a column row mountain retaining wall having no water stopping ability. You can

[0011]

EFFECTS OF THE INVENTION Since the method of constructing the waterproof column row mountain retaining wall of the present invention is as described above, the following effects can be obtained. <A> It is not necessary to construct by overlapping with the same diameter over the entire length unlike the conventional column-row mountain retaining wall. Only the section in the depth direction where groundwater is expected to be run is constructed as a column-mountain retaining wall with water stop, and the other section in the depth direction does not have water stop and is simply in contact. Just build a retaining wall. <B> Switching the structure according to the target ground in this way,
It can be completed by one-step continuous operation. Therefore, the construction work time can be shortened and the construction cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a method of constructing a waterproofing column row mountain retaining wall of the present invention.

FIG. 2 is an explanatory view of an embodiment of a hole drilling device.

FIG. 3 is an explanatory view of a state in which the enlarged blade of the hole drilling device is enlarged.

Claims (3)

[Claims] 1. A method for constructing a mountain retaining wall by adjoining a large number of piles in the ground, wherein piles and piles are brought into contact with each other in a depth direction section where waterproofing is not required. A method of constructing a still water retaining wall in which a wall is constructed, and pile sections are piled up to partially overlap each other to construct a mountain retaining wall continuously in the depth direction section where water stopping is required. 2. A method for constructing a mountain retaining wall by adjoining a large number of piles in the ground, wherein piles and piles are brought into contact with each other in a depth direction section where waterproofing is not required. In the section of the depth direction where the wall is constructed and waterproofing is required, pile piles and piles are partially overlapped to form a mountain retaining wall continuously. Construction method of waterproofing mountain retaining wall by inserting steel material, concrete pile, etc. as core material 3. A method of constructing a mountain retaining wall by adjoining a large number of piles in the ground, wherein a section in the depth direction which does not require waterproofing is drilled by a drilling device that does not expand, A pile retaining wall is constructed by contacting piles with each other, and in sections in the depth direction where water cutoff is required, holes are drilled with a drilling device enlarged to a large diameter to partially cut the cross section of piles and piles. Constructing a still water retaining wall by stacking and constructing a continuous retaining wall