JP4197383B2 - Underground continuous wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground continuous wall in which a wire saw can be used.
[0002]
[Prior art]
In conventional underground continuous walls, when part is removed after construction, the part is torn down with a giant breaker, or the part of the part is cut with a wall saw and core boring is placed in parallel. It was done by the method of cutting the edges.
[0003]
[Problems to be solved by the invention]
However, when a giant breaker is used, noise and vibration are very large, so that it cannot be applied in an urban area or the like, and there is a problem that the underground continuous wall is adversely affected by the structure. Moreover, in the wall saw, when the wall thickness is considerably large, there is a problem that cutting that penetrates to the rear surface of the wall body cannot be performed. Further, in the case of the method of cutting the core boring in parallel with the surroundings, there is a problem that much work is required.
[0004]
Therefore, as a technical means that can avoid these problems, a method of cutting the periphery of the part with a wire saw can be considered.
[0005]
However, in the conventional underground continuous wall, since the back is a natural ground, the cutting area cannot be surrounded by the wire of the wire saw, and therefore, the wire saw cannot be used.
[0006]
Then, the objective of this invention is providing the underground continuous wall which can use a wire saw.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the continuous underground wall according to the present invention is closed on both ends with plugs and positioned on the side of the excavation area, and the axial portion in the wall thickness direction and the axial portion in the wall surface direction are formed adjacent to each other. wherein wire insertion of substantially U-shaped, in a state surrounding the disconnected regions, are pre-mounted, that included angle between the axis portion of the wall thickness direction and the wall surface direction of the axis portion is obtuse It is said.
[0008]
Here, the wire insertion tube refers to a tube that is attached in advance when constructing the underground continuous wall and through which the wire of a wire saw used for cutting the underground continuous wall after construction is inserted. Any wire insertion tube can be used as long as it can be cut with a wire saw. However, since the back side of the cut surface of the pipe is not cut, a material that can be easily torn (broken) is desirable. For example, a vinyl chloride pipe, a winding pipe, an ultrathin steel pipe, etc. can be used.
[0009]
Therefore, according to the present invention, since the underground continuous wall with the wire insertion tube attached in advance is realized, the wire of the wire saw is also inserted behind the wall body which is a natural mountain, and the cutting area is surrounded. Will be able to.
[0010]
Therefore, the wire saw can be used even in a situation where the background is a natural ground.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[0012]
FIG. 1 is a perspective view showing a schematic configuration of an underground continuous wall according to an embodiment of the present invention, and FIG. 2 is a plan view showing a detailed configuration of the underground continuous wall.
[0013]
As shown in FIG. 1, the U-shaped wire insertion tube 1 is mounted in advance in a state in which the both ends 11 are positioned on the excavation region side and the cutting region 2 is surrounded. It has a configuration.
[0014]
Here, a plurality of wire insertion tubes 1 (first wire insertion tube 1a, second wire insertion tube 1b, third wire insertion tube 1c, and fourth wire insertion tube 1d) are connected to both ends 11 as shown in FIG. It is mounted on the excavation area side so as to surround the cutting area 2 (first cutting area 2a, second cutting area 2b, third cutting area 2c, fourth cutting area 2d). It is necessary to install the wire saw on the side of the excavation area and perform the cutting work of the wall body. To realize such a cutting work, the wire saw wire (not shown) is also behind the wall body that is a natural ground. This is because the fact that it is necessary to surround the cutting region 2 is taken into consideration.
[0015]
Here, the first cutting region 2a is cut by a wire saw (not shown) using the first wire insertion tube 1a, and the second cutting region 2b is cut by a wire saw using the second wire insertion tube 1b. The third cutting region 2c is cut with a wire saw using the third wire insertion tube 1c, and the fourth cutting region 2d is cut with a wire saw using the fourth wire insertion tube 1d. As a result, the trapezoidal cutting region 2 is cut.
[0016]
Further, as shown in FIG. 1, the wire insertion tube 1 is configured to be mounted in advance before placing the concrete in the underground continuous wall 3. Even if the wall is drilled after the concrete is hardened, it is considered that it is practically difficult to install the wire insertion tube 1 behind the wall that is a natural ground. It is what.
[0017]
Here, “pre-installation” means that it is theoretically installed at a timing before the concrete is hardened, but is usually installed at the timing before placing concrete after excavation using a stabilizing liquid. It means to be done.
[0018]
Specifically, the wire insertion tube 1 is sequentially attached to the reinforcing bar 12 that is suspended by the crane in the stable liquid of the excavation hole with a numbered wire 13 or the like (see FIG. 2). Note that the mounting timing of the wire insertion tube 1 is not limited to when the reinforcing bar 12 is being built, and may be when the reinforcing bar 12 is assembled on land.
[0019]
Further, as shown in FIG. 2, the wire insertion tube 1 is mounted in a state where both ends 11 are closed with plugs 14. The wire insertion tube 1 is mounted before the concrete is hardened and is placed in a stabilizing liquid or fresh concrete. The penetration of the stabilizing liquid or the fresh concrete is prevented, and the wire saw has a function as a wire insertion path. This is because it is necessary to secure. In addition, as long as it prevents intrusion, for example, a method of filling hard grease or the like may be used.
In FIGS. 1 and 2, both ends 11 are arranged so as to protrude from the underground continuous wall 3, but the present invention is not limited to this and may be in the wall surface. In that case, after internal excavation, the concrete near both ends 11 of the wire insertion tube 1 is scraped off and opened. In this case, there is an advantage that does not hinder the passage of the guide wall or the like. In addition, as shown in FIG. 2, the mold 15 is previously placed on the cutting region 2 side of the wire insertion tube 1 in parallel with the portion of the wire insertion tube 1 parallel to the depth direction on the rear side of the continuous underground wall 3. When installed so as to be in contact with the portion, when the concrete of the underground continuous wall 3 is cut, a part 3a of the wall body whose edge is cut by cutting can be easily taken out.
The material of the mold 15 may be selected from a plate material made of a synthetic resin such as a wood material or foamed polystyrene in order to facilitate cutting with a wire saw.
[0020]
Further, when fresh concrete is expected to wrap around the gap between the formwork 15 and the natural ground J, the gap is filled with a backup material (not shown) made of foamed polystyrene that can be easily removed. May be prevented.
[0021]
Therefore, according to the underground continuous wall 3 according to the present embodiment, since the wire insertion tube 1 is mounted in advance, the wire of the wire saw is inserted even behind the wall body which is a natural ground, and the cutting region 2 can be enclosed.
[0022]
As a result, the wire saw can be used even in a situation where the background is a natural ground.
[0023]
In this embodiment, as shown in FIG. 2, a string-like member that is inserted in a state protruding from both ends 11 of the wire insertion tube 1 and draws the wire of the wire saw when cutting the underground continuous wall 3 after curing. A messenger 16 is provided. Thereby, the operation | work which inserts the wire of a wire saw in the wire penetration pipe | tube 1 can be performed easily and rapidly.
[0024]
In addition, as shown in FIG. 1, an included angle A formed between a portion of the wire insertion tube 1 that draws an axis in the wall thickness direction and a portion that draws an axis in the wall surface direction (the depth direction of the wall). Is obtuse. As a result, after the cutting region 2 is cut by the wire saw, the operation of removing the part 3a of the wall body whose edge is cut by cutting to the front side can be easily and quickly performed.
[0025]
【The invention's effect】
According to the underground continuous wall which concerns on this invention, since it comprised as mentioned above, use of a wire saw is attained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a continuous underground wall according to an embodiment of the present invention.
FIG. 2 is a plan view showing a detailed configuration of a continuous underground wall according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wire insertion tube 1a ... 1st wire insertion tube 1b ... 2nd wire insertion tube 1c ... 3rd wire insertion tube 1d ... 4th wire insertion tube 2 ... Cutting area 2a ... 1st cutting area 2b ... 2nd cutting area 2c ... 3rd cutting area 2d ... 4th cutting area 3 ... Underground continuous wall 3a ... Part 11 of wall body ... Both ends 12 ... Reinforcing bar 13 ... Wire etc. 14 ... Plug 15 ... Formwork 16 ... Messenger J ... Machiyama A ... the included angle

Claims (1)

Both ends is positioned excavation area side is closed with a plug, wire insertion wall thickness direction of the axis portion and the wall surface direction of the axis portion and the adjacent substantially U formed shape is in a state surrounding the disconnect regions, Pre-installed ,
An underground continuous wall characterized in that an included angle between the axial portion in the wall thickness direction and the axial portion in the wall surface direction is an obtuse angle .

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