JPH0617418A - Annular underground continuous wall and partition board thereof - Google Patents

Abstract

PURPOSE:To reduce a wall thickness remarkably by arranging cushion materials in joints of arc wall bodies, in forming an annular underground continuous wall by depositing and connecting multiple arc wall bodies to each other. CONSTITUTION:Multiple annular unit wall bodies 1a, 1b,... 1n driven into the ground are connected to each other through partition boards 3 to construct an annular underground continuous wall. In this case, reinforcement cage 4 is jointed to the board 3, and a cushion material 4 is stamped integrally on the board 3. Thus a wall thickness can be reduced by approx. 30% because the cushion material absorbs an axial force in circumferential direction, and also this can be worked easily at low cost without changing the conventional work method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular underground continuous wall which is first constructed for retaining a mountain when constructing an underground tank having a circular plane shape, and a partition plate used for the construction.

[0002]

2. Description of the Related Art An ordinary underground continuous wall is constructed by excavating a unit-length slot along a construction line and placing concrete in the slot alternately to form a large number of holes in the ground. It is configured by driving unit wall bodies and connecting the unit wall bodies to each other. This unit wall body includes a unit wall body that is placed in advance every other unit and a following unit wall body that is placed between the preceding unit wall bodies. At the time of concrete pouring, the partition plate provided at the end of the reinforcing steel cage is integrally connected as a joint.

[0003]

Since the continuous underground wall formed by connecting the unit wall bodies as described above has connecting portions at regular intervals, it is constructed in the ground as a circular mountain retaining wall and the inside thereof is formed. In the case of constructing a counter-beam wall for a ring beam, it is necessary to consider the axial force especially in the circumferential direction. The countermeasure against the axial force can be solved by increasing the wall thickness, but since the increase in wall thickness causes an increase in weight, it may be difficult to adopt depending on the ground condition. In addition, since it is necessary to excavate a wide groove hole, an excavator equipped with a large-diameter drill is required, the excavation equipment becomes large-scaled, and the materials used are increased, so that the cost rises significantly. Have.

The present invention has been conceived in view of the above circumstances, and an object thereof is to provide a new structure capable of absorbing the axial force in the circumferential direction acting on the underground continuous wall at the connecting portion between the unit wall bodies. The purpose is to provide a continuous underground wall.

[0005]

The features of the present invention according to the above-mentioned object are that the excavation of an arc-shaped slot having a unit length and the concrete pouring into the arc-shaped slot are alternately performed, and In a circular underground continuous wall for mountain retaining constructed by placing a number of unit walls and connecting the unit walls to each other using partition plates as joints, a cushion for absorbing axial force at the connecting portion of each unit wall The member is provided in contact with the plate surface of the partition plate.

Another feature of the present invention is that a partition plate of a circular underground continuous wall is provided with a vertically long plate body in which one side plate surface is provided with tenon angle members at regular intervals, and at both side ends of the plate body. It is composed of a vertically long support plate provided and a cushion member having a required thickness attached to the other side plate surface of the plate body.

[0007]

[Operation] In the above configuration, the axial axial force in the circumferential direction of the circular underground continuous wall is absorbed by the cushion members of the joint portions located at regular intervals.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 in the figure is an underground continuous wall constructed in a circular shape in the ground 2 for use as a retaining wall.
1n is connected. This unit wall 1a, 1b
A partition plate 3 is provided as a joint at each connection portion of 1n, and each partition wall 3 has a unit wall 1a, 1b.
n reinforcing bar cage 4 is jointed.

The partition plate 3 is a vertically long plate body 3 in which tenon angle members 30, 30 are horizontally provided on one side plate surface at regular intervals.
1 as a main body, and vertically long support plates 3 on both sides of the plate 31.
2 and a blocking sheet 33 are provided. A cushion material 5 having a required thickness such as a styrohome is integrally attached to the other plate surface of the plate 31 with an adhesive, and the cushion material 5 is in close contact with the concrete 6 of the wall body. The axial force in the circumferential direction of the circular underground continuous wall 1 is absorbed at each connection portion at regular intervals.

The circular underground continuous wall 1 having such a cushion material 5 can be constructed by the same construction method as that of a normal underground continuous wall. If one example is schematically shown in FIG. 4, first, every other arc-shaped slot holes 11 and 12 having a unit length are excavated along the construction line. Partition plates 3 are jointed to both ends of the rebar cage 4 with the cushion material 5 directed toward the splice side, and the rebar cage 4 together with the partition plate 3 is provided with the slot holes 11,
Build in 12.

After concrete is cast in the slots to construct the unit walls 1a and 1c in the ground, the unit walls 1a and 1c are
An arc-shaped slot 13 is excavated during 1c. After the reinforcing bar cage 4 is built in the middle slot 13 and both ends of the reinforcing bar cage are connected to the partition plate 3 using joint bars or the like, concrete is poured to construct the unit wall 1b. As a result, the following unit wall body 1b and the preceding unit wall bodies 1a and 1c are connected, and the circular underground continuous wall 1 in which the cushioning material 5 is positioned with the partition plate 3 at the connecting portion is constructed underground. To be done.

[0012]

As described above, according to the present invention, the cushion member is provided at the connecting portion of each unit wall body in contact with the plate surface of the partition plate, and the cushion member absorbs the axial force in the circumferential direction. When constructing a circular underground continuous wall, it is not necessary to take axial force in the circumferential direction into consideration, and the wall thickness in design can be reduced by 30% or more than ever.

Further, since the construction method itself is no different from the conventional method by simply attaching the cushioning material to the partition plate, there is no need for special means for construction or large-scale excavation equipment. The cost does not increase.

[Brief description of drawings]

FIG. 1 is a partial plan view of a circular continuous underground wall according to the present invention.

FIG. 2 is a plan sectional view of a connecting portion.

FIG. 3 is a vertical sectional side view of a partition plate.

FIG. 4 shows an example of construction of a circular underground continuous wall.
C is a process explanatory view.

[Explanation of symbols]

 1 Underground continuous wall 1a, 1b, 1c, 1n Unit wall 2 Ground 3 Partition plate 4 Reinforcing cage 5 Cushion material 30 Mortice angle material 31 Bending plate 32 Support plate

Claims (2)

[Claims] 1. A plurality of unit wall bodies are placed in the ground by alternately excavating an arc-shaped slot hole having a unit length and placing concrete in the arc-shaped slot hole. In a circular underground continuous wall for mountain retaining constructed by connecting a body to each other using a partition plate as a joint, a cushion member for absorbing axial force is provided in contact with the plate surface of the partition plate at the connecting portion of each unit wall body. A circular underground continuous wall characterized by that. 2. A vertically long plate body in which angle members for mortise are horizontally provided at regular intervals on one side plate surface, vertically long support plates provided at both ends of the plate body, and attached to the other side plate surface of the plate body. A partition plate for a circular underground wall, comprising a cushion member having a required thickness.