JP7216956B2 - Column improvement method and soil cement column wall construction method using core material press-in and vibration press-in - Google Patents

Description

The present invention relates to a soil cement column wall construction method using a column improvement method, core material press-fitting, and vibration press-fitting. By press-fitting, the core material can be installed efficiently.

For example, as shown in FIGS. 4(a) to 4(c), the soil cement column column construction method connects an auger motor 2 mounted on a pile driver 6 to, for example, a triaxial stirring rod 3 to rotate and A plurality of soil cement columns a are partially wrapped by forcibly stirring and mixing with the in-situ soil by injecting and jetting slurry-like cement-based solidifying material from the tip of the stirring rod 3 while press-fitting. It is a construction method in which a continuous wall is formed in the ground by creating a continuous wall, and it is widely used in the construction of ground retaining water walls and earth retaining walls.

In addition, a core material B made of H-shaped steel, steel sheet piles, secondary concrete products, or the like is usually inserted into the soil cement columns a in preparation for earth pressure and water pressure.

In addition, since cement-based solidifying materials have a large water-cement ratio (W/C), they are manufactured in slurry form, and are generally injected in a large amount of 60 to 100% of the in-situ soil, the cement-based solidifying material Soil cement, which is produced by agitating and mixing in-situ soil with soil, is very soft and almost muddy immediately after construction.

Further, the core material B can be easily installed by simply hanging it in the soil cement column a by hanging it with a crane or the like.

JP 2009-235676 A Japanese Patent Application Laid-Open No. 2004-225361

Since the soil cement immediately after construction is muddy, the core material B can be easily erected in the soil cement column a by hanging it with a crane or the like, but it is disposed of as industrial waste. There was a problem that a large amount of surplus soil was generated, and the processing cost was high. Moreover, since it is necessary to inject a large amount of cement-based solidifying material, there is also a problem that the construction tends to be extremely uneconomical.

The present invention has been made in order to solve the above problems. It is an object of the present invention to provide a column improvement method capable of reducing the amount of surplus soil discharged, and a soil cement column row wall method using core material press-in and vibration press-in.

In the present invention, a cement-based solidification material and in-situ soil are agitated and mixed to construct a soil cement column series in the ground, and a core material made of H-shaped steel or the like is pressed into the column to form a diaphragm wall. It is an invention of a soil cement column column construction method using a columnar improvement method to create a column and a core material press-in and vibration press-in. By press-fitting the core material into the column or pressing it while imparting vibration, the core material can be installed in the soil cement column very efficiently.

In addition, it is economical and desirable to mix 20 to 70 parts by weight of the cement-based solidifying material with 100 parts by weight of the in-situ soil. can be done.

In addition, by using magnesia-based solidifying material for part or all of the cement-based solidifying material, the fluidity of the soil cement can be increased. can be reduced. Magnesium carbonate, magnesium oxide, or the like can be used as the magnesia-based solidifying material.

According to the present invention, a cement-based solidification material injected from the ground and in-situ soil are agitated and mixed to construct a soil cement column train in the ground, and a core material made of H-shaped steel or the like is installed therein. In the soil cement column row wall construction method, the core material is pressed into the soil cement column row immediately after construction, or by pressing it while applying vibration, even if the soil cement is a little hard, the core material can be easily removed. can be installed in

In addition, since the amount of cement-based solidifying material to be injected can be reduced, the amount of surplus soil that is treated as industrial waste can be reduced.

Furthermore, by replacing part or all of the cement-based solidifying agent with a magnesia-based solidifying agent, the fluidity of the soil cement can be increased, and the water-cement ratio of the solidifying agent can be reduced accordingly, reducing the amount of surplus soil discharged. be able to.

FIGS. 1(a) to 1(e) are explanatory diagrams showing the construction procedure of a soil cement column wall. FIGS. 2(a) to 2(e) are explanatory diagrams showing a construction procedure for installing a core material in a soil cement column. Fig. 2 is a plan view of a soil cement column body and a soil cement column wall; FIGS. 4(a) to 4(c) are explanatory diagrams showing a conventional example of a soil cement column colonnade construction method.

The soil cement column wall construction method using the column improvement method of the present invention, core material press-in and vibration press-in consists of a soil cement column wall construction method (Fig. 1 (a) to (e)) and a core material installation method ( It consists of two construction methods shown in Fig. 2 (a) to (e).

Below, we will explain the construction method of the soil cement column wall (Fig. 1 (a) to (e)) and the construction method of the core material (Fig. 2 (a) to (e)).

(1) Construction of Soil Cement Pillar Row A 2- to 5-axis stirring rod 3 is connected to an auger motor 2 installed on a leader 1 erected on the ground. Then, while rotating the stirring rod 3 by the auger motor 2 and pressing it into the ground by its own weight, slurry-like cement-based solidifying material is injected/sprayed from the tip of the stirring rod 3 to mix and stir the in-situ soil. A soil cement column row a is constructed by mixing (see Fig. 3).

A plurality of soil cement column rows a are constructed while being lapped for a predetermined length, thereby constructing a soil cement column wall A composed of a plurality of soil cement column rows a (see FIG. 3).

By adding magnesium carbonate to the cement-based solidifying material, the fluidity of the soil cement can be greatly improved. It is possible to greatly reduce the amount of excavated soil discharged as.

(2) Installation of core material A pile driver 6 having a vibration function is installed on the leader 5 of the base machine 4 for excavation and pile driving. Also, the core material B is erected vertically along the leader 5 and gripped by a chucking device (not shown) installed on the pile driver 6 .

Then, the core materials B are installed at equal intervals in the soil cement column row a before solidification by press-fitting the core materials B with a pile driver 6 or press-fitting them while applying vibration. At that time, since the cement-based solidifying material to be injected into the ground contains magnesium carbonate, the soil cement has good fluidity, so that the core material B can be easily erected in the soil cement column a. be able to. For the core material B, H-section steel, steel sheet piles, secondary products of concrete, or the like can be used.

According to the present invention, a core material made of H-shaped steel or the like is press-fitted into a soil-cement column, or is press-fitted while applying vibration, so that the core material can be easily installed and cemented. By reducing the amount of material injected, it is possible to reduce the amount of surplus soil that is disposed of as industrial waste.

1 leader 2 auger motor 3 stirring rod 4 base machine 5 leader 6 pile driver A soil cement column wall B core material a soil cement column body

Claims (3)

Cement-based solidifying material injected from the ground is agitated and mixed with in-situ soil, and construction is performed while wrapping multiple soil cement columns in the ground. In the soil cement column wall construction method for creating a Vibration characterized in that a pile driver having a function is installed along a leader, gripped by a chucking device installed in the pile driver, and press-fitted while applying vibration by the pile driver . Soil cement column colonnade construction method using press -in. In the soil cement column wall construction method using vibration press -fitting according to claim 1 , the cement-based solidification material injected from the ground is stirred and mixed with the in-situ soil using a 2-axis to 5-axis stirring rod to be underground. A soil cement column column wall construction method using vibration press -fitting, characterized in that construction is performed while a plurality of soil cement column columns are lapped on each other . 3. The soil cement column column construction method using vibration press - fitting according to claim 1 or 2, wherein a part or all of the cement-based solidification material is replaced with a magnesia-based solidification material. Cement column colonnade construction method.

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