JP2732009B2 - Construction method of underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground continuous wall.

[0002]

2. Description of the Related Art As is well known, an underground continuous wall formed as a continuous panel made of reinforced concrete is formed by excavating a horizontally long excavation hole to a predetermined size using a stable liquid by an excavation machine for an underground continuous wall. A reinforced concrete basket is inserted into the inside, and then concrete is poured into the excavation hole to create a reinforced concrete panel in the ground as a preceding element, and the concrete single panel is used as a unit element and a following element is added thereto. It is something that connects.

[0003] Such underground continuous walls can be used for underground structures such as earth retaining walls, basements, underground storage tanks, etc. Usually, one side of the completed underground continuous wall is an excavation side for excision. And the other is on the ground side under earth pressure.

Conventionally, such countermeasures against water blocking of the underground continuous wall have been taken at the boundary between the preceding element and the following element (between the walls), for example, by providing a water stopping steel material here. Have been obtained.

[0005]

However, no active countermeasures have been taken against water leakage from general parts other than between the walls, and if water leakage occurs, water leakage treatment such as resin injection from the digging side must be taken. However, although measures are taken to improve the ground by injecting high pressure into the ground side, the cost ratio is not effective.

[0006] As described above, the amount of water leakage largely depends on the quality of the construction of the underground continuous wall, and it is not possible to expect complete water stoppage.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to dramatically improve the water shielding effect, and as a result, it is possible to substantially eliminate repair work such as injection of water stoppage. To provide a construction method.

[0008]

According to the present invention, in order to achieve the above object, an excavating machine for an underground continuous wall is used to excavate to a predetermined size using a stabilizing solution, a reinforcing cage is hung in a hole, and concrete is cast. In the construction method of the underground continuous wall to form a reinforced concrete panel, the ground side of the reinforced basket is covered with an impermeable sheet between the partition plates, and the excavated side is covered with a permeable sheet, Casting concrete, or excavating to a predetermined size using a stabilizing solution with an excavating machine for underground continuous wall, hanging a reinforced cage in the hole, casting concrete, and forming a reinforced concrete panel In the construction method of the underground continuous wall, at least the ground side of the reinforcing bar between the partition plates is covered with a steel plate, and concrete is cast inside the steel plate, or in addition to these configurations, Suitably providing the window opening in the plate,
Alternatively, the gist of the invention is that a water stop plate is provided in a flange shape so that the assembly member penetrates the assembly member in the width direction of the excavation hole constituting the rebar cage.

[0009]

According to the first aspect of the present invention, by arranging the water-impermeable sheet on the ground side, the continuity of the water leakage point which has been generated partially in the past is cut off, so that the entire wall surface is formed. Water leakage is very small, and water stoppage can be greatly improved.

In addition to this, concrete can be prevented from directly contacting the digging wall by surrounding the digging side of the reinforcing bar with a permeable sheet or a steel plate between the partition plates, and the surface of the underground continuous wall on the digging side can be prevented. As the concrete becomes smooth and the strength increases, the work of "hanging" and cleaning the wall can be greatly reduced. In addition, by adopting a water-permeable sheet on the excavation surface side, the moisture of the poured concrete can be released to the excavation surface side.

According to the second aspect of the present invention, since the member disposed on the ground side is a steel plate, collapse of the excavated wall surface can be prevented, and water leakage as a whole wall surface can be completely eliminated, so that water stopping performance can be further improved. Can be improved.

According to the third aspect of the present invention, in addition to the above-described operation, concrete is filled between the ground and the steel plate from the window hole, so that no void is formed therebetween.

According to the fourth aspect of the present invention, in addition to the above-described effects, water leakage easily occurs from the ground side to the excavation side along the assembly member in the width direction of the excavation hole constituting the rebar cage. However, it is possible to completely prevent the water stop plate by providing the water stop plate in a flange shape so that the assembly member penetrates.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a first embodiment of a method for constructing an underground continuous wall according to the present invention, in which 1 is a leading element, 2 is a following element, all of which are stabilized by an underground continuous wall excavating machine. An excavation hole 6 is formed to a predetermined size using the liquid, a reinforced cage 3 is suspended in the excavation hole 6, and concrete 5 is cast to form a reinforced concrete panel.

In the present invention, for example, in the preceding element 1, the reinforcing bar 3 has partition plates 9 at both ends, and the surface on the ground side A between the partition plates 9 of the reinforcing bar 3 is impermeable by a water-impermeable sheet 12. The surface of the excavation side B is surrounded by the water permeable sheet 4 and concrete 5 is cast inside the surface.

The reinforcing bar 3 is formed by arranging grids of vertical bars and horizontal bars and connecting them by an assembling member 7 in the width direction of the excavation hole 6. As shown in FIG. 4, a water-stop plate 8 such as a water-stop rubber plate is provided in a flange shape so that the assembly member 7 penetrates.

In the illustrated example, the water stop plate 8 is a single assembly member 7.
Although it is not shown, only it is attached to all the assembly members 7. Further, the number of the water stop plates 8 attached to one assembly member 7 may be plural at intervals.

In this manner, a reinforced concrete panel is formed by placing concrete 5 inside the portion surrounded by the partition plate 9, the impermeable sheet 12 and the permeable sheet 4. Note that, unlike the hard sheet such as a steel plate, the water-impermeable sheet 12 comes into close contact with the excavated wall surface (the ground) due to the lateral pressure of the concrete 5, so that there is no possibility that a gap is formed between the sheet and the ground.

Further, a water stop plate 8 provided in a flange shape on an assembling member 7 in the width direction of the excavation hole 6 constituting the rebar cage 3 is buried in the concrete 5, whereby the ground side A to the excavation side B
Water leakage generated along the assembling member 7 is prevented by the water stop plate 8.

By the way, after the preceding element 1 is constructed, the succeeding element 2 is constructed to continue the panel.
The ground side A may be covered with the water-impermeable sheet 12 and the excavation side B may be covered with the water-permeable sheet 4 to form a similar water-impermeable water-blocking film.

In this case, the rebar cage 3 of the following element 2
Since there is no partition plate, the water-impermeable sheet 12 and the water-permeable sheet 4 are inserted into the excavation hole 6 at the same time as the insertion of the rebar cage 3, and the ends are fixed to the rebar joint of the preceding element 1. It is possible.

FIG. 2 shows a second embodiment of the present invention.
The reinforcing bar 3 of the preceding element 1 covers at least the surface A on the ground side between the partition plates 9 with the steel plate 10. The excavation side B of the rebar cage 3 is covered with the water permeable sheet 4 as in the first embodiment.

Window holes 11 are formed in the steel plate 10 at appropriate sizes and intervals.

In this way, the partition plate 9 and the steel plate 10
If concrete 5 is cast inside the portion surrounded by the water permeable sheet 4, a reinforced concrete panel is formed. However, by arranging the steel plate 10 on the ground side, water leakage as the whole wall surface is suppressed, Can be greatly improved.

Although a gap may be formed between the steel plate 10 and the hole wall of the excavation hole 6, the concrete 5 is filled between the ground and the steel plate 10 through the window hole 11 to fill the gap.

In any of the first and second embodiments, if the surface of the underground continuous wall is covered with the water-permeable sheet 4 on the excavation side B, the concrete becomes smooth and the strength increases. Labor and washing operations can be saved.

[0027]

As described above, the method for constructing an underground continuous wall according to the present invention can dramatically improve the water shielding effect of a general portion other than between the walls, and as a result, repair such as injection of water stoppage. Work can be almost eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a method for constructing an underground continuous wall according to the present invention.

FIG. 2 is a plan view showing a second embodiment of the method for constructing an underground continuous wall according to the present invention.

FIG. 3 is a side view showing an arrangement of a water stop plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Leading element 2 ... Trailing element 3 ... Rebar cage 4 ... Water permeable sheet 5 ... Concrete 6 ... Drilling hole 7 ... Assembly member 8 ... Water stop plate 9 ... Partition plate 10 ... Steel plate 11 ... Window hole 12 ... Water impermeability Sheet

Claims (4)

(57) [Claims] An excavation machine for an underground continuous wall is used to excavate to a predetermined size using a stabilizing liquid, and a reinforcing cage is suspended in a hole,
In the construction method of the continuous underground wall which casts concrete to form a reinforced concrete panel, the ground side of the reinforced basket is covered with an impermeable sheet between the partition plates, and the excavated side is covered with a permeable sheet, An underground continuous wall construction method characterized by casting concrete inside this. 2. Excavation to a predetermined size using a stabilizing liquid by an excavating machine for underground continuous wall, suspending a steel cage in a hole,
In the method of constructing a reinforced concrete panel by casting concrete to form a reinforced concrete panel, at least the ground side of the reinforced basket is covered with a steel plate between partition plates, and concrete is cast inside the steel plate. Construction method for underground continuous walls. 3. The method for constructing an underground continuous wall according to claim 2, wherein window holes are appropriately provided in the steel plate. 4. The watertight plate is provided in a flange shape so that the assembly member passes through the assembly member in the width direction of the excavation hole constituting the reinforcing bar cage. Construction method of underground continuous wall.