JPS606420B2 - Construction method of hollow synthetic continuous underground wall using precast boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a continuous underground wall using precast boards for the underground wall.

Continuous underground walls are mainly constructed of columns made of steel pipes, H-steel, or concrete piles, or concrete is cast by dropping reinforcing bars into the excavated ground. In the former case, there are disadvantages such as severe water leakage after excavation inside the pile row due to the permeability of the stratum or bending of the pile row, and to prevent this, chemical solution must be injected outside the pile row. was there.

Moreover, in the latter case, water in the coagulation sheet causes a decline in the quality and strength of the concrete, and there are problems with the watertightness and rigidity of the joints. The purpose of this invention is to be able to freely perform post-treatment of joints, ensure sufficient watertightness and rigidity, and, since it is a synthetic precast structure, to be able to adequately manage underground wall concrete, and to maintain the size and size of the members. It is an object of the present invention to provide a method of constructing a continuous underground wall that can reduce the wall thickness of the material.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, A is a vertically long underground wall produced in a factory.
This underground wall body A is constituted by a precast board 1 and a web 2 that protrudes from between the upper and lower green areas of the precast board 1 at least at both green portions on one side of the precast board 1.

The above-mentioned web 2 is made by combining the precast plate 1 and a flange on one side of H steel with a dowel, as shown in Fig. 1, and by precasting with reinforcement inside, as shown in Fig. 2. There is one that is integrated with the concrete of the plate 1, and there is also a case where an intermediate web 2 is provided between the webs 2 on both sides. In addition, in the illustration, a groove 3 is provided on the abutting side surfaces of the precast plates 1, and the dowel material 4 is made to protrude into the groove 3, but the flat side surfaces of the precast plates 1 may simply be abutted.

Next, to explain the method of constructing a continuous underground wall using the above-mentioned underground wall body A, it is shown that on the construction line of the underground wall, a groove B is created while excavating with an excavator from the ground to a predetermined depth underground. .

Thereafter, the underground wall bodies A are sequentially inserted into the groove B so that their sides abut against each other. At this time, the web 2 is positioned inside the underground wall.

Then, concrete C is poured between the end webs 2, 2, which face each other with the butt sides of the precast board 1 interposed therebetween, in order to ensure the watertightness and rigidity of the butt joint. After that, the inside of the underground wall body A is excavated and the web 2 is exposed.
A panel 5 is placed oppositely on the leading edge of the panel 5.
Concrete is poured in between to create an underground structure wall 6.

In addition, in order to synthesize the underground structure wall 6 and the underground wall A, if the web 2 is made of H steel, a dowel is melted.

As mentioned above, "According to the construction method of a continuous underground wall according to the present invention, since a precast structure is used for the underground wall body, it is possible to adequately manage the concrete, and it is also possible to When concrete is poured by vertically dropping reinforcing bars into the concrete, water will not cause a decline in the quality and strength of the concrete.

In addition, since two end webs are provided on at least both sides of one side of the precast board, concrete can be poured between the two webs that sandwich the abutting sides of the precast board to relatively easily improve the watertightness and stiffness of the joint. Furthermore, even after excavating the inside of the underground wall, reinforcement by installing diaphragms, etc. can be performed.

Furthermore, since the underground structural wall is constructed through web spacing, a space exists between the precast board and the underground structural wall.

For this reason, unlike conventional methods in which concrete is filled into grooves, the amount of concrete used is reduced, saving materials and making it possible to provide the product at low cost.

In addition to shortening the construction period, by making the web a composite structure using steel materials as shown in the diagram, when joining beams and columns, joint reinforcing bars and dowels can be inserted into the underground wall in advance, unlike conventional methods. The above-mentioned steel materials can be used directly without the need for digging underground walls to expose reinforcing bars.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 3 is a cross-sectional plan view of an underground wall, FIG. Longitudinal side view with inserted
FIG. 5 is a plan view of the same, FIG. 6 is a vertical sectional side view of the underground structure wall, FIG. 7 is a plan view of the same, and FIG. 8 is a perspective view of the same. A...Underground wall "B...Groove"C...Concrete" 1...Precast board, 2...Web, 3...
・Groove portion t 4... Dowel material 6... Underground structure wall. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A precast underground wall is formed by a vertically elongated board and a web protruding from a line connecting the top and bottom ends at least on both side edges of one side of the board, and a precast underground wall is formed from the ground on the construction line of the underground wall. After excavating a trench to a deep depth and inserting the underground wall so that the side edges abut against this trench and the web is inside the underground wall, the abutting sides of the underground wall are inserted. Concrete is poured between the opposing webs to ensure watertightness and rigidity, and then the inside of the underground wall is excavated and a concrete plate is placed to join the leading edges of the webs to create an underground structure. A method for constructing a hollow synthetic continuous underground wall using precast boards to form a wall body.