JPS5947772B2 - Construction method of underground continuous wall - Google Patents

Description

[Detailed Description of the Invention] This invention uses interlocking material that is expandable and contractible in the width direction, and each time a unit wall section is constructed, the width of the interlocking material is reduced and the interlocking material is moved laterally through muddy water such as bentonite to a predetermined position. This invention relates to a method of constructing an underground continuous wall that forms a continuous wall.

The conventional construction method for underground continuous walls is to install interlocking pipes in excavated holes, then place concrete in the excavated grooves between the interlocking pipes (place concrete underwater in bentonite mud). The usual method is to pull out the interlocking pipe in accordance with the progress of curing, thereby forming a continuous wall one after another.

However, it is necessary to erect and pull out interlocking pipes for each unit wall construction, and it is important to erect them vertically, and to pull them out in accordance with the hardening progress of concrete 1. The things that have to be done are extremely time-consuming.

This invention was developed in view of such circumstances, and will be explained below based on the illustrated embodiments.

The construction procedure begins by using the muddy water method to excavate trench A to the required depth.
excavation.

Next, the interlocking material 1, which can be expanded and contracted in the width direction, is suspended in this excavated groove A with the distance between the suppression plates 2°2 reduced.
Once installed at a predetermined position, a pressing force is applied from inside the interlocking material 1 in the width direction to press the pressing plate 2 against the wall surface of the excavated groove A so that it can withstand the concrete pressure when concrete 11 is placed.

In addition, it is the first interlock material that stretches and contracts in the width direction.
As shown in the figure, a hinge structure having a hinge 3 and a connecting member 4, or a telescoping type telescopic tube can be attached to the press plate 2.
, 2, and for the pressing force in the width direction, in addition to the jack 6 shown in Fig. 1, a rubber tube or the like is inserted between the suppressing plates 2 and 2, and air pressure is used. etc. are possible.

Once the interlock material 1 is fixed to the wall of the excavation groove A,
Subsequently, reinforcing bars 10 and partition iron plates 7 are erected in the unit wall portion of the underground continuous wall (the right side portion in FIG. 1), and concrete 12 is placed.

The partition iron plate 7 can be directly connected to the reinforcing bar front 10 and integrated, or it can be built independently and separately. Also, in order to connect to the next unit wall part, joint reinforcing bars are installed on the surface. 8. A water stop plate 9 etc. is provided protrudingly, and a sheet 11 attached to the end prevents leakage of the concrete 12.

When the concrete 12 begins to develop strength, the pressing force in the width direction is removed (in the case of the figure, the jack 6 is shortened), and the distance between the interlocking plates 2 and 2 of the interlocking material 1 is shortened,
In this state, gently move the interlocking material 1 sideways to the next installation position so as not to affect the muddy water such as bentonite, fix this interlocking material 1 to the wall surface of the excavation trench A, and repeat the same process to the unit walls one by one. Connect them to form a continuous underground wall.

This invention consists of the above-mentioned structure and is an interlocution.

Since the timber is expandable and contractible in the width direction, it can be moved laterally by reducing its width. The construction is very easy because it is sufficient to simply hang it down (there is no resistance from the excavated trench wall).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the construction of the present invention, and FIG. 2 is a side view of the interlocking material. A... Excavation groove, 1... Interlock material, 2... Pressing plate, 3... Hinge, 4
...Connection member, 5...Frame, 6.
...Judge, 7...Partition iron plate, 8...
... Steel plate for joint, 9 ... Water stop plate, 1
0... Before reinforcing bar, 11--- Sheet, 12
······concrete.

Claims (1)

[Scope of Claims] 1. Pressing force is applied in the width direction from the inside to the interlocking material that is expandable and contractible in the width direction, and the pressing plate of the interlocking material is pressed against the wall surface of the excavated trench so that it can resist concrete pressure. After the concrete is poured and the concrete has developed its strength, the pressing force is removed, and the interlocking material is gently moved horizontally through muddy water to a predetermined position with the distance between the pressing plates shortened, and the same work is carried out. A construction method for an underground continuous wall, which is characterized by repeating the above steps to form a continuous underground wall in sequence. 2. The construction method for an underground continuous wall according to claim 1, wherein the interlocking material has a hinge structure so that it can be expanded and contracted in the width direction. 3. A construction method for an underground continuous wall according to claim 1 or 2, in which a partition iron plate is erected on the concrete placement side of the interlocking material.