JPS61242219A - Construction of underground continuous wall - Google Patents

Abstract

PURPOSE:To easily construct sheathing walls durable against great earth and water pressures by a method in which walls are connected toward the direction of face to form paired inner and outer walls closely in such a way that the connecting portions between the panels of the inner and outer walls are slide from each other. CONSTITUTION:A sheathing wall 10 is made up of paired inner and outer walls 12 and 14 connected toward their facial direction. The lower end of the inner wall 12 is set below the excavated bottom 16, and the lower end of the outer wall 14 is led to in impermeable layer. The first and second panels 14a and 14b of the outer wall 14 are formed separately from each other at an interval of the length l of the panel, and the panels 12a and 12b of the inner wall 14 are formed in an overlapped manner. The third panel 14c is formed between the panels 14a and 14b of the outer wall 14. The water-stopping property and structural integrality of the connecting portions can thus be mutually supplemented and secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for constructing an underground continuous wall, and more particularly to a method for constructing an underground continuous wall suitable for earth retaining walls of deep or large structures.

(Conventional technology and problems) As is well known, when constructing an underground structure, an earth retaining wall is constructed to surround the structure. 1 method is relatively widely used.

In the underground continuous wall construction method, a narrow trench several meters long is excavated from the ground to a specified depth using the muddy water construction method, a reinforcing bar cage is erected, and the concrete is poured while replacing the muddy water. Forms a panel-like wall by curing,
This is a construction method that repeats the same work to extend the panels horizontally () to form a designated earth retaining wall.

By the way, in the case of earth retaining walls for large structures or constructed at great depths, the earth water pressure acting on the earth retaining walls becomes extremely large, so the bearing capacity of the earth retaining walls must be increased.

Increasing the strength of earth retaining walls may be done simply by increasing the wall thickness, but the following problems occurred when doing so.

In other words, in the conventional underground continuous wall method, the excavation machine is designed to be able to excavate a narrow trench, and even if some adjustment is possible, it is difficult to excavate a trench that is twice as wide, for example. Therefore, it would be economically disadvantageous to develop a new excavation machine for this purpose.

This invention was made in view of these circumstances, and its purpose is to easily construct earth retaining walls that can withstand large earth water pressure using conventional excavation machines and construction techniques. The goal is to provide a way to build.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for constructing a wall for earth retention of a deep or large structure as an underground continuous wall, in which the wall is It is characterized in that at least one pair of inner and outer walls connected to the inner and outer walls are closely formed.

(Embodiments and Effects) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

FIGS. 1 and 2 show an embodiment of a method for constructing an underground continuous wall according to the present invention.

The construction method shown in the figure is to excavate a narrow trench several meters long from the ground to a predetermined depth using the muddy water method as an earth retaining wall 10 for a deep or large structure, and then erect a reinforcing bar cage. It is the same as the conventional underground continuous wall described above in that it is cast while displacing muddy water and concrete and forms a panel-like wall by hardening the sinkcrete, and is formed using the same construction technology. be done.

The construction method, which is not shown in the figure, has the following features.

That is, the earth retaining wall 10 is composed of a pair of inner walls 12 and outer walls 14 having substantially the same thickness and connected in the plane direction, and these walls 12 and 14 are formed in close contact with each other.

The lower end of the inner wall 12 is located at a position slightly below the excavation bottom surface 16 (cutting bed) in the wall body 10, and the lower end of the outer wall 14 is deeper than the inner wall 12, reaching the impermeable layer in the ground. has reached.

This is because the wall 10 located below the general rule bottom 16 is provided as 1 to stop water and prevent boiling, and there is no need to support soil water pressure, so the overall thickness of the wall 10 is reduced. They are not the same, and the portion shown by the dotted line in FIG. 1 is omitted.

The inner and outer walls 12, 14 are each divided into a plurality of panels 12a, 12b, . . . each having approximately the same length p.

14a, 14b..., and in the method shown in FIG.
, 14b are separated from each other by a panel thickness λ, and then a first panel 12a of the inner wall 12 is formed so that half of its length overlaps the inner surface of the first panel 14a of the outer wall 14, Thereafter, the second panel 12 of the inner wall 12
b is formed at the end of the first panel 12a so as to overlap with the inner surface of the second panel 14b of the outer wall 14.

Next, the first panel 14a and the second panel 14 of the outer wall 14
A third panel 14C is formed between the third panel 14C and the third panel 14C, and one cycle is completed.

The cycle of forming each panel 12a, 14a in this way may be repeated 4 times at appropriate intervals in the length direction of the wall 10 to be constructed. will no longer be so delayed.

By repeating the above cycle in order, the earth retaining wall 10 of a desired length can be constructed.

The constructed wall 10 has a thickness approximately twice that of the inner and outer walls 12.14, and has sufficient strength to withstand the large earth water pressure that acts on it as an earth retaining wall for deep or large structures. .

In addition, each panel 1 of the inner and outer walls 12.14 is
2a and 14a, the lateral connections between the panels 12a and 148 will be shifted so that they do not coincide with each other. It can complement and effectively strengthen weak points.

In addition, in the embodiment described above, the first . Although the case where the second panels 14a and 14b are formed is shown, it is of course possible to form the panels of the inner wall 12 in this way first.

In addition, in order to make the earth retaining wall capable of withstanding greater soil water pressure, a triple wall structure may be used. In this case, the inner and outer walls 12
．． 14 are constructed at intervals and sandwiched between these 112 and 14 to form an intermediate wall.

(Effects of the Invention) As explained in detail in the above embodiments, according to the method for constructing an underground continuous wall according to the present invention, the soil water pressure at great depths can be It is relatively easy to construct earth retaining walls that can withstand

Furthermore, if the connecting parts between the panels are staggered so that they do not coincide, excellent effects can be obtained, such as effectively reinforcing the weakest point of the continuous underground wall construction method.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the method of the present invention, and FIG. 2 is a plan view thereof.

Claims (3)

[Claims] (1) A method for constructing a wall for earth retention of a deep or large structure as an underground continuous wall, characterized in that the wall is formed with at least a pair of inner and outer walls connected in the plane direction and in close contact with each other. A method of constructing an underground continuous wall. (2) A patent characterized in that the inner and outer walls are each formed by connecting panels divided into predetermined lengths in the transverse direction, and the connecting portions between the panels of the inner and outer walls are offset so as not to coincide with each other. A method for constructing an underground continuous wall according to claim 1. (3) The inner and outer walls are formed by forming one of the panels at a predetermined interval, and then forming the other panel so that the end overlaps with the panel. The method for constructing an underground continuous wall as described in Section 2.