JPS6350489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing continuous sheet pile walls in soft soil layers.

A continuous hardening layer is formed by discharging a soil hardening agent within the soft soil layer, and when the treated layer is not yet hardened, piles or sheet piles are driven in appropriate locations to harden the soft soil layer. Although it is known from the original invention of this application to bury pipes or provide open grooves in the pipes, the present invention is similar to the original invention by causing adjacent sheet piles to mesh with each other. The goal is to achieve the following objectives.

An example of implementing the present invention will be described below based on the drawings.

Figure 1 shows the inside of soft soil layer 1, which was previously proposed by the present applicant in Japanese Patent Application No. 1983-130934 (Japanese Patent Application No. 50-80670).
This figure shows a state in which a continuous hardening layer 2 is formed using a hardening device (not shown) such as the above, and 3 is a stirring blade. Here is the stirring blade 3
is the movement of the curing treatment equipment (in the illustrated example, in the direction of arrow A)
The soil hardening agent is constantly discharged to the stirring part during the vertical movement, so that hardening treatment is performed. In this example, while the stirring blade is rotating, the curing agent is discharged from the inside of the stirring blade, which is also formed hollow, to the outside through the through hole 5 through the hollow part of the rotating shaft 4.

In the above embodiment, the curing device moves slowly, and along with the movement, the stirring blade and the stirring blade 3
By repeatedly raising and lowering the stirring blade 3 while rotating it within a certain height range within the soft soil layer, the hardened layer 2 is formed within the soft soil layer while making the trajectory of the so-called stirring blade 3 serrated.
The stirring blade 3 is connected to the rotating shaft 4.
By providing multiple stages, the same continuous hardening layer 2 may be formed by rotating and moving the hardening device without raising and lowering it. Note that the curing agent may be mixed with a waterproofing agent, sand, etc. as appropriate depending on the purpose.

FIG. 2 is a perspective view showing a state in which sheet piles 6 are interlocked with the continuous hardened layer 2 to form a continuous sheet pile wall 7, and the driving of the sheet piles 6 is performed in the hardened layer by the hardening device. At the same time as the formation of the layer, and while the layer is still in an uncured state, it is driven into a certain depth using various known pile driving machines. These sheet piles come in various shapes such as U-shape and Z-shape, and you are free to adopt any of these sheet piles, but what is important in the present invention is that the joint portions P are designed to mesh with each other. In addition, the portion is surrounded by a hardened layer.

FIG. 3 shows another example, in which the continuous sheet pile wall was formed in the continuous hardening layer formed by the continuous movement of the hardening device in the previous embodiment, whereas in this example the hardening device was moved intermittently. In other words, it is stopped at a certain distance position corresponding to the joint part of the sheet pile, and the soil hardening agent is discharged into the stirring part while the stirring blade is rotated and raised and lowered at this part, thereby forming a columnar hardened pile layer. 3' is formed, and then the sheet piles 6' are driven while the hardened pile layer 3' is in an unhardened state, and the joint portion of each sheet pile 6' is positioned within the columnar hardened pile layer 3'. This is what you do.

In the above embodiment, the case where the adjacent columnar hardened pile layers 3' are formed with a certain distance S has been described, but S may be set to zero or may be formed so as to overlap each other. good.

According to the present invention, since the sheet piles are driven into the wall shape when the hardened layer is not yet hardened, construction can be carried out without noise and vibration, and the joint portion is completely surrounded by the hardened layer. Therefore, it has excellent strength and can be used to construct continuous walls that are completely impervious to water.

Additional relation: It is not possible to form a continuous hardened layer by discharging a soil hardening agent in a soft soil layer, and to drive piles or sheet piles at necessary locations when the treated layer is unhardened. Invention (Patent No. 139518 (Special Publication No. 1983)
50489), and this invention makes this point an essential part of its structure, and is an invention that provides a civil engineering structure in a soft soil layer. In this respect, it achieves the same purpose as the original invention.

[Brief explanation of the drawing]

Figure 1 is a semi-illustrated diagram showing the state in which a continuous hardened layer is formed within a soft soil layer, and Figure 2 is a perspective view showing the state in which a continuous sheet pile wall is formed in the continuous hardened layer shown in Figure 1. The perspective view, FIG. 3, shows another example. 1... Soft soil layer, 2... Hardened layer, 3...
Stirring blade, 4... Rotating shaft, 6... Sheet pile, 7... Continuous sheet pile wall.

Claims (1)

[Claims] 1. Prior to the work of interlocking the sheet piles to form a driving continuous sheet pile wall, a rotating stirring blade is used to supply a soil hardening agent into the soft soil layer that exists in the corresponding position of the interlocking position of the sheet piles. A method for constructing a continuous sheet pile wall in a soft soil layer, characterized by carrying out the work of stirring and hardening the soil, and driving the sheet piles when the hardening treatment area is finally hardened.