JP2889310B2 - Construction method of ground wall with core material - Google Patents

Description

The present invention relates to a method of constructing a ground wall with a core material.

(B) Conventional technology Conventionally, for foundation work and the like, a large number of excavation holes are wrapped in the ground and excavated, and a solidifying agent is mixed with excavated soil in the excavation holes, and the underground wall is solidified by solidification of the mixture. There is a construction method that removes the internal soil surrounded by the underground wall and creates a construction space that is retained by the underground wall, and reinforces the underground wall against earth pressure from the surroundings For this purpose, a core material such as an H-beam is inserted before the mixture is solidified, and the earth pressure is supported by the core material and the solidified mixture.

(C) Problems to be solved by the invention However, when the foundation work is completed, the construction space is backfilled, and the earth pressure applied to the underground wall balances inside and outside, so the strength of the underground wall becomes unnecessary. Nevertheless, since the solidified mixture and the core material are fixed, the core material cannot be recovered, and is buried in the ground with the solidified mixture,
There was a disadvantage that materials were wasted.

(D) Means for Solving the Problems According to the present invention, a continuous ground containing a core material in which excavated soil in an excavation hole drilled in the ground is mixed with a solidifying agent, and a core material is inserted before solidification of the mixture. In the construction method of the middle wall, at the lower end of the core material,
While attaching a plate-shaped fixing member having a planar shape substantially the same as the cross-sectional shape of the core material, enclosing the outer periphery of the core material with a separation membrane, and attaching the lower edge of the separation membrane to the fixing member. The present invention provides a method for constructing an inner wall with a core material, which is characterized by being inserted into an admixture.

(E) Function / Effect According to the present invention, since the outer periphery of the core material is encapsulated by the separation membrane, even if the mixture is solidified,
When the core material is pulled upward, no slippage occurs between the separation membrane and the core material, and no sticking occurs between the separation membrane and the core material. The separation membrane can be pulled out, and since the lower edge is fixed to the lower end of the core through a fixing member, the separation membrane is turned upside down in the space after the core is pulled out from the admixture. It is peeled off, pulled up together with the core material, and collected.

Therefore, at the time of backfilling, the core material and the separation membrane can be pulled out and collected from the solidified mixture and reused, so that resources can be effectively used and cost can be reduced.

(F) Example An example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, (A) shows an excavator for building an underground wall, and a leader (2) is erected on a self-propelled heavy equipment main body (1), and the leader (2) is placed above the leader (2). From
A motor (3) and a contra-rotating gear unit (4) are mounted so as to be able to move up and down freely, and an excavating shaft (5) composed of an inner shaft and an outer shaft at the lower end of the contra-rotating wheel device (4). ) And coaxial (5)
Excavation blade (6) at the lower end of the blade, inside and outside stirring blades (7) in the middle
(8) is attached, and each stirring blade (7) (8) is rotated in the opposite direction.

(B) is a solidifying agent injection device, which pumps the solidifying agent,
Through the swivel (9) provided at the upper end of the excavation shaft (5) and the inside of the excavation shaft (5), the gas is ejected from the spout (10) at the lower end of the coaxial (5).

The excavator (A) excavates the excavation hole (H) in the ground (G), ejects the solidifying agent into the excavated soil in the excavation hole (H), and rotates the inner and outer stirring blades ( 7)
In (8), the excavated soil and the solidifying agent are mixed, and then, the excavating shaft (5) is pulled out, and a core is inserted from above into the admixture (K) as shown in FIG. An H-shaped steel as the material (S) is inserted.

The core material (S) is covered with a separation membrane (M) as shown in FIGS. 2 and 3, and the separation membrane (M) has a vertically long shape having a closed lower end and an opening at the upper end. It is formed in a bag shape, and the core material (S) can be covered with the separation membrane (M) by inserting the core material (S) into the separation membrane (M) from the opening. I have to.

Further, the lower end of the separation membrane (M) is fixed to the lower end edge of the core material (S) by a plate-shaped fixing member (s) having a planar shape substantially the same as the cross-sectional shape of the core material (S). The lower end of the separation membrane (M) is connected to the lower end of the separation membrane (M) by a bolt or the like which is inserted through the fixing member (s) and the lower end of the separation membrane (M) and screwed to the lower end surface of the core material (S). It is fixed to the lower edge of the material (S).

To the separation membrane (M), one end of a tube made of a material that is difficult to adhere to the mixture (K), for example, a synthetic resin such as polyethylene, polystyrene, or polyvinyl chloride, is bonded to a core material. One formed in a vertically long bag shape that matches the shape of (S) can be used.

In addition to the above, it is also possible to form a canvas or the like in a bag shape and impregnate or apply a synthetic resin or the like into the bag to use as a separation membrane (M).

The core material (S) is mixed into the unsolidified mixture (K) of the excavation hole (H) from above, and the solidification of the mixture (K) is awaited.

Although the above description has been given of the cored excavation hole (H) as one unit of the underground wall (D), as shown in FIG. A continuous underground wall (D) can be built.

In the figure, (L) is a horizontal frame for reinforcing the underground wall (D).

In addition, according to the required strength of the underground wall (D), the arrangement of the core material (S) can be arranged for each excavation hole (H) or every other excavation hole (H).

By removing the internal soil partitioned by the underground wall (D) thus constructed, a work space for foundation work or the like is formed.

When the work such as the foundation work is completed, the work space is backfilled. According to the above-described method of constructing the underground wall with a core material according to the present invention, the core material ( S) can be pulled out and collected by a crane or the like.

That is, as shown in FIG. 5, the separation membrane (M) is interposed between the core material (S) and the solidified admixture (K) to prevent the two materials from sticking to each other. When S) is pulled upward, slippage occurs between the separation membrane (M) and the core material (S), and the core material (S) can be pulled out from the solidified admixture (K) with a small force. The lower end of the separation membrane (M) is the core material (S)
Since the core material (S) is fixed to the lower end thereof, the core material (S) is turned upside down in the space after the core material (S) is pulled out, is peeled off from the mixture (K), and is pulled upward together with the core material (S) and collected. .

Further, a lubricant may be interposed between the inner surface of the separation membrane (M) and the core material (S) in order to facilitate the extraction of the core material (S).

As described above, the core material (S) and the separation membrane (M) can be extracted from the solidified admixture (K), recovered and reused, thereby contributing to effective use of resources and cost reduction. Can be.

FIG. 6 shows that the separation membrane (M) is formed in a bag shape with a bottom, and the core material (S) is inserted into the separation membrane (M). S) is encapsulated, and the separation membrane (M)
And the lower end of the core material (S) is not fixed, which is suitable when the separation membrane (M) is discarded after the core material (S) is extracted.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an excavator, FIG. 2 is a side view of a core material, and FIG.
Fig. 4 is a perspective view of a core material covered with a separation membrane, Fig. 4 is a plan view of an underground wall, Fig. 5 is an explanatory view of core material withdrawal, and Fig. 6 is a perspective view showing another embodiment. (D): Underground wall (G): Ground (H): Drilling hole (K): Mixture (M): Separation membrane (S): Core material

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/00-5/20

Claims (1)

(57) [Claims] A core material in which excavated soil in an excavation hole (H) formed in a ground (G) is mixed with a solidifying agent, and a core material (S) is inserted before solidification of the mixture (K). In the method for constructing a mid-entry wall (D), a plate-shaped fixing member (S) having a planar shape substantially the same as the cross-sectional shape of the core material (S) is attached to a lower end of the core material (S). Enclosing the outer periphery of the core material (S) with the separation membrane (M), attaching the lower edge of the separation membrane (M) to the fixing member (S), and then inserting the same into the mixture (K). A method of constructing a ground wall with a core material, characterized by the following.