JPH0733657B2 - Column-type underground continuous wall construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called column type underground continuous wall construction method.

[0002]

2. Description of the Related Art A column-type underground continuous wall construction method is a method of kneading in-situ soil and hardened material by rotating a shaft equipped with stirring blades and augers to create a soil pile. There is one in which H steel 39 as shown in FIG. 14 is inserted with a reinforcing material to extend a columnar mountain retaining wall.

When this construction method is adopted, since the reinforcing material is inserted into the soil pile in a non-solidified state, noise and vibration are much less generated than the steel sheet pile construction method.
In addition, since the formed continuous underground wall has a relatively large resistance to shearing and bending when the soil pile is hardened, it is also excellent in waterproofing of the entire wall. However, when a continuous wall having a construction depth of more than 30 m is formed by the above method, there is a problem that it is difficult to form a material having excellent waterproofness.

This is because the reinforcing material is bent in the direction of the wall surface where the construction depth increases (the second moment of area of the H steel in the direction perpendicular to the wall surface is large, but the second area of the H steel in the direction of forming the wall surface is second This is because the moment is small, so that it bends), and the gap between the lower ends of the reinforcing members is partially widened.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a column-type underground continuous wall construction method capable of forming a continuous wall excellent in water shutoff for a long period of time even when the construction depth is large. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a reinforcing material to be inserted into a continuous unsolidified soil pile has a steel pipe material having a circular cross-section and a connecting plate portion having an H-shaped cross-section. Column type underground continuation consisting of two types of special shape material with a projecting receiver, and forming a continuous wall by alternately arranging the special shape material receiver and the steel pipe material in a close arrangement A wall construction method, in which the steel pipes are respectively inserted into the left and right soil piles formed by separating one soil pile, and each of the receivers faces the steel pipes in the centrally located soil pile. And a step of inserting a special mold material while doing so.

The area where the receiver is disposed may be the entire length of the H-shaped cross section material. The area where the receiver is disposed may be a part of the length of the H-shaped cross-section material. The receiver may have a tip recessed portion that substantially matches the outer radius of curvature of the steel pipe material.

[0008]

The present invention operates as follows. In the construction method of the present invention, even if the construction depth is large, the special shaped material is a steel pipe material that is less bent in the wall forming direction due to the presence of the receiver provided in the special shape material (in the direction perpendicular to the wall forming direction and the wall forming direction. The wall surface having the same second moment of area) is inserted as a guide, and as a result, the H-shaped section material of the special molding material and the steel pipe material can be alternately arranged substantially evenly.

Therefore, the column-column-type underground continuous wall produced by the method of the present invention has a long-term waterproofing property even when the construction depth is large, as compared with the column-column-type underground continuous wall produced by the method described in the section of the prior art. Is excellent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the drawings shown as embodiments. In this embodiment, a columnar type underground continuous wall is formed using a triaxial excavator K as shown in FIGS. 1 and 2, and the excavator K is a pile as shown in FIG. The shaft rotation drive device 2 is vertically movably attached to a reader R standing in front of the driver P, and three excavation shafts 1 are attached to the shaft rotation drive device 2.

As shown in FIG. 2, the excavation shaft 1 is provided with a bit 10 at the lower end and a screw 11 in the middle, and the screw 11 of the adjoining excavation shaft 1 is provided.
It is assumed that the screws overlap each other in a plane. (The screw 11 was originally developed and filed in Japanese Patent Application 1-
323383 can be used). Below, the excavator K
The method of forming a column-type underground continuous wall of the present invention by using will be specifically described according to (1) to (10). (1). The shaft rotation drive device 4 is lowered, and as shown in FIG. 3, a hole is drilled while pouring cement milk or the like from the tip of the excavation shaft 1. (2). When the continuous hole 9a having a predetermined depth can be formed, the shaft rotation driving device 2 is raised to rotate the excavation shaft 1 through the continuous hole 9a and pull out as shown in FIG. When the excavation shaft 1 is pulled out from the continuous hole 9a, as shown in FIGS. 5 and 8, a soil pile that is not solidified is formed in the continuous hole 9a. (3). Next, a reinforcing material is inserted into the soil pile in the above state. As the reinforcing material, a steel pipe material 3a having a circular cross section with an outer diameter slightly smaller than the diameter of the screw 11 as shown in FIG. 6 and a connecting plate portion having an H-shaped cross section as shown in FIG. In addition, two types of special mold material 3b having the receivers 30 projecting back to each other are used. Further, in this embodiment, as shown in FIG. 7, the receiving member 30 is a steel pipe member 3 in which a vertical rib 31 serving as a reinforcing member and a plate member are curved.
The receiver main body 32 (corresponding to the tip recessed portion in the column of the means) that substantially matches the outer radius of curvature of a. (4). Regarding the insertion of the reinforcing material into the soil pile, first, as shown in FIG. 9, the special mold material 3b is inserted into the central portion of the continuous hole 9a. In the final stage of construction, if the starting hole (the hole at the left end in the figure) and the terminal hole are not overlapped, the steel pipe material 3a is inserted into the starting hole before inserting the special mold material 3b into the soil pile. You can also keep it. (5). Next, as shown in FIG. 10, a continuous hole 9c is bored from the continuous hole 9a at a predetermined interval, and then, as shown in FIG.
As shown in FIG. 1, a continuous hole 9b that connects the continuous hole 9a and the continuous hole 9c described above is formed. (6). The steel pipe materials 3a are respectively inserted into the left and right end holes of the continuous hole 9b as shown in FIG. (7). As shown in FIG. 13, the special mold material 3b is inserted into the central hole of the continuous hole 9b. In this case, special mold material 3
b is inserted by using the outer wall surface of the steel pipe material 3a (having the same second moment of area in the wall surface forming direction and the direction perpendicular to the wall surface) with little bending in the wall surface forming direction due to the presence of the receiver main body 32 provided therein. Therefore, the H-shaped cross-section shaped material, which is the main material of the special shaped material 3b, does not largely deviate to one of the steel pipe materials 3a and 3a. (8). As shown in the figure, a continuous hole 9e is bored at a predetermined distance from the continuous hole 9c, and then a continuous hole 9d for communicating the continuous hole 9c with the continuous hole 9e is formed. Pierce. (9). When the steel pipe material 3a is inserted into the left end hole of the continuous hole 9d and then the special mold material 3b is inserted into the central hole of the continuous hole 9c,
Similar to the above, the H-shaped cross section of the special shape material 3b is the steel pipe material 3
There is no large deviation from either a or 3a. (10). Repeating the above, steel pipe 3a
Thus, it is possible to form a column-type underground continuous wall in which the special shaped material 3b and the special shaped material 3b are substantially evenly arranged.

In the above embodiment, the receiver main body 32 is a plate member curved in an arc shape, but the present invention is not limited to this, and may be, for example, a plate member expanding in a V shape toward the tip. The above-mentioned receiver 30 may be provided in the entire lengthwise direction of the H-shaped cross-section material, or in a certain area (eg, lower end area, middle area, upper end area) of the H-shaped cross-section material. You may make it provide only.

[0013]

The present invention having the above-mentioned structure has the following effects. From the contents described in the action column,
We were able to provide a column-type underground continuous wall construction method that can form continuous walls with excellent waterproofing properties for a long period of time.

[Brief description of drawings]

FIG. 1 is a side view of an excavator used in the column-row underground continuous wall construction method of the present invention.

FIG. 2 is a diagram showing a shaft rotation driving device and a shaft for excavator.

FIG. 3 is a view showing a state in which continuous holes are drilled by the excavator.

FIG. 4 is a view showing a state where the boring of the continuous hole by the excavator is completed and the excavation shaft is pulled up.

FIG. 5 is a sectional view of a continuous hole.

FIG. 6 is a perspective view of a steel pipe material used in the column-row underground continuous wall construction method of the present invention.

FIG. 7 is a perspective view of a special mold material used in the column-row-type underground continuous wall construction method of the present invention.

FIG. 8 is a view of an open hole of the continuous hole.

FIG. 9 is a plan view (1) for explaining the pillar-line type underground continuous wall construction method of the present invention.

FIG. 10 is a plan view (2) for explaining the pillar row type underground continuous wall construction method of the present invention.

FIG. 11 is a plan view (3) for explaining the pillar row type underground continuous wall construction method of the present invention.

FIG. 12 is a plan view (4) for explaining the column-row underground continuous wall construction method of the present invention.

FIG. 13 is a plan view (5) for explaining the column-row underground continuous wall construction method of the present invention.

FIG. 14 is a diagram showing a reinforcing material and its arrangement in a conventional column-row underground continuous wall construction method.

[Explanation of symbols]

 3a Steel pipe material 3b Special shape material 30 Receiver

Claims (4)

[Claims] 1. A reinforcing material to be inserted into a continuous unsolidified soil pile is a steel pipe material having a circular cross section and a cross section H.
It consists of two types of special mold material having receivers projecting back to each other on the connecting plate part of the character-shaped mold material, and these mold materials are arranged alternately in a manner in which the receiver of the special mold material and the steel pipe material are provided close to each other. Is a column-row type underground continuous wall construction method that forms a continuous wall by inserting steel pipes into the left and right soil piles that are separated by one soil pile, and that of the one located in the center of the soil piles. A column-row-type underground continuous wall construction method, characterized in that it has a step of inserting a special mold material while facing each of the receivers to the steel pipe material. 2. The column-row-type underground continuous wall construction method according to claim 1, wherein the receiving area is the entire area in the lengthwise direction of the H-shaped section material. 3. The column-column-type underground continuous wall construction method according to claim 1, wherein the receiving area is provided as a part of the H-shaped cross-section material in the longitudinal direction. 4. The column-column-type underground continuous wall construction method according to claim 1, wherein the receiver has a tip recessed portion that substantially matches the outer radius of curvature of the steel pipe material.