JPH0359210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for installing agitated and mixed piles in the ground while partially overlapping them.

A rotating shaft equipped with a stirring blade at the lower end is rotated, and the ground improvement agent is supplied to the rotation range of the stirring blade while being raised or lowered to create a stirring-mixed pile in the ground. When repeatedly forming a series of partially overlapping agitated and mixed pile rows, if a long period of time elapses between the creation of the previous pile and the next pile, the hardening of the previous pile may occur. As the pile progresses, it becomes difficult to build the next pile in an overlapping state.
Conventionally, in such cases, hardening retarders have been mixed into the soil conditioner, but
It is not sufficiently effective.

The present invention is an attempt to solve the above-mentioned problem.The present invention is aimed at solving the above-mentioned problems by not supplying the soil improving agent but only stirring it with a stirring blade while the soil improving agent for the previously created pile at the joint part is not yet hardened. The feature is that the soil improvement agent is spread in the overlapping part of the previously created pile at the joint part by performing so-called dry pouring, so that the overlapping construction of the next pile can be performed without any hindrance. It is said that

Hereinafter, the present invention will be specifically explained based on the drawings.

In FIG. 1 showing an example of a construction machine for carrying out the present invention, 1 is the construction machine body, 2 is a rotating shaft suspended from the construction machine body 1 so as to be able to move up and down, and 3 is a rotary shaft protruding from the lower end of the rotating shaft 2. The stirring blade 4 is a soil improvement agent supply pipe inserted into the rotating shaft 2, and the pile treated with stirring and mixing according to the present invention has the soil improvement agent supplied within the rotating range of the stirring blade 3 through the soil improvement agent supply pipe 4. It is created by spouting or discharging the liquid and raising or lowering the rotary shaft 2 while rotating it.

As shown in Figure 2, such a pile is
Pile A, B, C, etc. are constructed in sequence, partially overlapping each other, but if the next pile D cannot be constructed immediately after pile C is constructed, pile D is constructed. At the position where the soil conditioner is to be used, the soil improvement agent is not supplied, but is raised or lowered while rotating the rotary shaft 2, and stirring is performed by the stirring blades 3.

In this way, when so-called dry firing is performed, the soil improvement agent in the overlap part a of the pile C is dispersed in the rotation range b of the stirring blade 3, and the concentration becomes thinner, so that the pile D will be created in this part later. No inconvenience will occur.

In short, in the construction method of the present invention, when piles that have been stirred and mixed are installed in a row while partially overlapping, the soil conditioner is applied at intervals in time to the overlapped area of the previously created pile in the joint area. Since the pile is spread by dry pouring, the next pile overlap construction can be carried out in the same manner as in the case of continuous pile construction.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of a construction machine for implementing the present invention;
FIG. 2 is an explanatory diagram of the construction method of the present invention. 1... Construction machine main body, 2... Rotating shaft, 3... Stirring blade, 4... Ground improvement agent supply pipe.

Claims (1)

[Claims] 1 Rotate a rotating shaft equipped with stirring blades at the bottom end,
A series of partially overlapping agitated and mixed piles is created by sequentially repeating the work of supplying a soil improvement agent within the rotating range of the agitating blades while raising or lowering them to create agitated and mixed piles in the ground. In the process of forming rows, while the soil improvement agent of the stirring mixed pile created at the tip of the pouring joint is not hardened, the soil improving agent is not supplied, and only stirring is performed using the stirring blade, and the pile is stirred at the pouring joint. A method for joining piles treated with stirring and mixing, which is characterized by spreading a ground improvement agent in the overlapping part of piles treated with stirring and mixing that have been created previously.