JPH06146269A - Construction method for joint part of underground wall - Google Patents

Abstract

PURPOSE:To prevent trouble during drilling adjoining element, and reduce the weight so as to improve workability and working efficiency, by using a flexible bag body as an interlocking pipe for a vertical joint part at constructing an underground wall. CONSTITUTION:A flexible cylindrical body 1 made of synthetic resin sheet and the like is formed, and formed into a bag shape by means of synthetic fiber and the like. Meanwhile, for construction of an underground wall, a groove 7 of length of one element of the underground wall is drilled, and the flexible cylindrical body 1 is vertically provided on the end part. The whole interior of the cylindrical body 1 is filled with stabilizing liquid, sand, and the like, and the cylindrical body 1 is self supported by contacting nearly a half of it with the earth and sand of the end face. In succeedingly using the cylindrical body 1, a reinforcement cage and the like is suspended in the groove 7, and concrete and stabilizing liquid are placed. After completing execution of one element, a groove 7 for an adjoining element is drilled.

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 joint portion of an underground wall.

[0002]

2. Description of the Related Art When constructing an underground continuous wall, the size which can be constructed at one time is limited, so one unit of the underground wall (element) and the next element are constructed after a certain period of time. Therefore, the end of one element must be left unfilled with concrete for a certain period of time so that it does not hinder the excavation of the next element. Therefore, conventionally, a steel cylinder (interlocking pipe) is vertically installed at the end of the excavation groove to perform a function of creating a space not filled with concrete on the connection side with the next element.

[0003]

The above-mentioned conventional method for constructing the joint portion of the underground wall has the following problems. <a> Steel pipes are heavy, and the deeper the excavation depth, the greater the weight. For this reason, it is uneconomical because an expensive exclusive lifting device must be kept on standby even if there is no continuous work. <B> Since the weight of the pipe is large, the workability is poor and it took time to construct. <C> The wall surface and end surface of the excavated trench do not maintain an accurate flat surface. However, on the other hand, the surface of the pipe is an accurate curved surface.
Therefore, the ground and the pipe are not in close contact. For this reason, the concrete that was placed easily entered the area that should not go around, which hindered the excavation of the next element.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a method of constructing a joint portion of an underground wall which is lightweight, easy to handle, and easy to construct. The purpose is to

[0005]

That is, the present invention excavates a groove having a length corresponding to one element of an underground wall, and a long cylindrical body made of a flexible material is vertically provided at the end of the groove. Installed in the vertical direction, and configured so that almost half of this flexible cylinder is in contact with the earth and sand on the end face of the wall surface, and the other half receives the load of the concrete placed in the excavated trench and the joint of the underground wall It is the construction method of the section.

The structure of the present invention will be described below with reference to the drawings.

<A> Structure of Cylindrical Body The cylindrical body used in the construction method of the present invention has the following structure. That is, it is a long flexible cylinder 1 formed of a flexible material such as a synthetic resin sheet as shown in FIG.
This is a long cylinder with a bottom, and is made of a known material having high strength such as reinforced synthetic fiber into a bag shape. As another embodiment of the flexible cylinder 1, as shown in FIG. 2, a part of the vertical surface is formed as a half cylinder 2 of a flexible material, and the other part is made of a material having a high rigidity. It is also possible to use a long cylinder formed of the strip 3. In that case, a semi-circular opening cylinder 4 obtained by axially cutting the pipe is attached to the edge of one long strip 3. The opening cylinder 4 is a member for protecting the vertical joint 6 of the reinforcing steel material 5 that is installed in the element to reinforce the concrete as described later.

<B> Excavation of groove and installation of cylinder For excavation of the underground wall, a groove 7 having a length corresponding to one element of the underground wall is first excavated by a known device. Next, in the case of the flexible cylinder 1 of the embodiment shown in FIG. 1, it is installed at the end of this groove 7 in the vertical direction as shown in FIG. In this case, since the flexible cylinder 1 is a hollow bag, it can be gently hung down by filling the inside with some stabilizing liquid or sand. When the flexible cylinder 1 has bottomed, a filling material 8 such as a stabilizing liquid or sand is applied to the entire inside.
To maintain hardness and shape. If fixed and the shape is secured, almost half of the flexible tubular body 1 comes into contact with the earth and sand on the end surface of the groove 7 to become self-supporting. Moreover, since it is flexible, it can fit to the unevenness of the end face of the groove 7 and can be brought into close contact therewith.

<C> Placing concrete, etc. When using the flexible cylinder 1 of FIG.
A rebar cage or the like is hung inside, and concrete or stabilizing liquid is poured. In this case, almost half of the flexible tubular body 1 is in contact with the earth and sand on the end face of the wall surface at the end of the groove 7, so that the load of concrete and the stabilizing liquid to be placed in the excavation groove 7 by the other half is applied. Will receive.

<D> Pulling up the cylindrical body When the construction of one element is completed, the groove 7 is excavated for the next adjacent element. It is also possible to leave the flexible tubular body 1 in the groove 7 as it is during this excavation and to excavate it while destroying it with an excavator. In some cases, the flexible cylinder 1 can be pulled up to the ground and collected. Any method of pulling up the cylinder 1 can be used repeatedly.

<E> In the case of the type having a strip plate In the case of the type in which the strip plate 3 and the flexible half cylinder 2 are combined as shown in FIG. 2, H steel or the like is placed inside the excavated groove 7. The reinforced steel material 5 based on is hung and installed vertically. A vertical joint 6 is provided at the edge of the reinforcing steel material 5. Next, at the end of the groove 7, a long cylindrical body, in which a part of the vertical surface as described above is formed by the flexible half cylinder 2 and the other part is formed by the vertically rigid strip plate 3, is installed in the vertical direction. . During its installation,
The vertical joint 6 can be protected by suspending the opening cylinder 4 at the edge of the strip steel 3 along the outside of the vertical joint 6 of the reinforcing steel material 5. Then, concrete is cast in the excavation groove 7 to be hardened, or a stabilizing solution is cast in the same manner as in the above embodiment. When the concrete hardens, the half cylinder 2 can be pulled up together with the strip 3 and diverted again. Alternatively, depending on the situation, it is also possible to leave it installed as it is, remove the stabilizing liquid and sand inside, and excavate the adjacent flexible element while destroying the flexible half cylinder 2.

[0011]

The construction method of the vertical joint portion of the underground wall of the present invention is as described above, so that the following effects can be obtained. <A> A flexible bag is used as the locking pipe. Therefore, the weight can be significantly reduced as compared with the conventional steel pipe, the handling is extremely easy, and the working efficiency is improved. <B> The shape of the end portion of the groove is not cut as orderly as illustrated in the drawing, and a large number of irregularities are present. Therefore, a steel pipe cannot be expected to have close contact with the ground.
However, in the method of the present invention, since a flexible pipe is used, it is possible to make good contact with the natural ground. Therefore, the poured concrete does not go around to the next element side, which does not hinder the excavation of the adjacent element.

[Brief description of drawings]

[Fig.1] Illustration of construction method for joints of underground wall

FIG. 2 is an explanatory view of an example of a member used for a joint of an underground wall.

[Fig. 3] An explanatory view of the construction method of the joint portion of the underground wall

[Fig. 4] An explanatory view of the construction method of the joint portion of the underground wall

Claims (4)

[Claims] 1. A trench having a length of one element of an underground wall is excavated, and a long tubular body made of a flexible material is vertically installed at an end portion of the trench. Construction method for the joint part of the underground wall in which almost half of the side surface of the body is brought into contact with the earth and sand on the end face of the wall surface, and the other half receives the load such as concrete placed in the excavation trench 2. A trench having a length corresponding to one element of an underground wall is excavated, and a long tubular body made of a flexible material is vertically installed at the end of the trench. Approximately half of the side surface of the body is brought into contact with the earth and sand on the end surface of the wall surface, the other half receives a load such as concrete that is placed in the excavation groove, and after hardening the concrete, the flexible cylinder is pulled up How to install the joint part 3. A trench having a length corresponding to one element of an underground wall is excavated, a reinforcing steel material is vertically installed inside the trench, and a part of the vertical surface is provided at the end of the trench. A long cylinder made of a flexible material and the other part made of a vertical steel plate was installed in the vertical direction, and the flexible part of this cylinder was brought into contact with the earth and sand on the end face of the wall surface. Attaching to the reinforcing steel material, then placing concrete etc. in the excavation groove, construction method of the joint part of the underground wall 4. A trench having a length of one element of an underground wall is excavated, a reinforcing steel material is vertically installed inside the trench, and a part of the vertical surface is provided at the end of the trench. A long cylinder made of a flexible material and the other part made of a vertical steel plate was installed in the vertical direction, and the flexible part of this cylinder was brought into contact with the earth and sand on the end face of the wall surface. Attaching to reinforcing steel material, then placing concrete etc. in the excavation groove, pulling up the flexible cylinder after hardening the concrete etc., construction method of joint part of underground wall