JP2836808B2 - Drill stirrer for soil cement pile method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole stirrer used in a soil cement pile method.

[0002]

2. Description of the Related Art The soil cement pile method is (1) a method in which a site is dug once, and then cement milk and earth and sand are stirred and mixed while pouring cement milk into a drilling hole. (2) A site is dug in advance. The method is roughly divided into drilling, injection of cement milk, and simultaneous stirring and mixing of cement milk and earth and sand.In any case, soil and sand having a volume equivalent to the volume of cement milk to be injected is found in the ground. Since the earth and sand spill out from the earth and contains the cement, the earth and sand that has flowed out is polluted with the environment and is disposed of as industrial waste, so that the disposal is expensive and the cost is high.

[0003] As a countermeasure, it is known that in the method (1), earth and sand having a volume corresponding to the volume of cement milk to be injected later is discharged at the time of hollowing.

[0004]

However, the method of (1) is adopted in the case of pile construction on a relatively large scale.
It is necessary to use at least two types of machines for empty moat, injection of cement milk, and mixing and stirring. Applying this advance soil removal process to the method of (2), which is adopted in the case of relatively small-scale pile construction, requires the introduction of a new excavator for soil removal. This leads to a further increase in cost.

The present invention has been made in view of the above problems, and an object of the present invention is to propose a drilling stirrer for forming a relatively small-scale soil cement pile. Use makes it possible to construct a soil cement pile with a simple operation without discharging cement milk or cement-containing earth and sand that may cause hard environmental pollution.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a machine for forming a soil cement pile including drilling, injection of cement milk, stirring and mixing of cement milk and earth and sand, and an associated earth removal operation. It is an invention made from the viewpoint of performing it.

Namely, the present invention is fitted in the fitting steel material a soil removing blade large area or from the stirring blade far, was welded to the lower surface
The drill stirrer for the soil cement pile method is detachably mounted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show a tip portion of a drilling and stirring machine according to the present invention, wherein FIG. 1A is a perspective view when a discharging blade is mounted, FIG. 1B is a side view when a discharging blade is mounted, and FIG. It is a bottom view of a discharge blade.

FIG. 2 is a longitudinal sectional view showing the steps of an example of forming a soil cement pile using the drilling and stirring machine of the present invention.

The body of the drill stirrer of the present invention is not different from a conventional drill stirrer for a soil cement pile method. Different from FIG. 1 (a), in that the detachably mounted the earth removal blade 3 having a large area or far than the stirring blade 2 in the stirring blades 2 of advanced as shown in (b). Although not shown, the rotary shaft 1 is provided with a cement milk injection pipe inside and a cement milk ejection hole at the tip, similarly to a normal drilling and stirring machine. A plurality of pairs of agitating blades 2 are provided on the outer periphery, and a digging blade 5 is attached to a tip outer periphery via a digging blade mounting blade 6. The rotating shaft 1 is rotatable in both forward and reverse directions as usual, and is vertically movable. At the time of drilling for soil cement pile formation, injection of cement milk, and stirring and mixing of cement milk and earth and sand, the discharging blade 3 is not mounted on the stirring blade 2, but at the time of discharging, the discharging blade 3 is not mounted. After the rotating shaft 1 is rotated forward in a state where it is mounted on the stirring blade 2 to excavate earth and sand, the rotation is stopped, the rotating shaft 1 is pulled up, and the excavated earth and sand is discharged to the ground. For this reason, it is preferable that the discharging blade 3 has a large area as long as it does not hinder the work. As shown in FIG. 1 (b), a fitting steel material 4 formed by processing a lip grooved steel or a steel plate so as to match the cross-sectional shape of the stirring blade 2 is welded to the lower surface of the discharging blade 3. Is attached to and detached from the stirring blade 2 via the fitting steel material 4. Although FIG. 1 shows a pair of the most advanced stirring blades 2, the number of the most advanced stirring blades 2 is one.
When forming a pair, the discharge blades 3 are attached to each of the three blades.

Referring to FIG. 2, the relationship between the mounting and dismounting of the discharging blade 3 to the drilling and stirring machine of the present invention and the construction procedure of the soil cement pile method will be described.

In this example, a relatively short soil cement pile having a length of several meters to about 10 m is formed by injecting cement milk twice in substantially equal amounts.

(1) Work with the discharge blades 3 mounted on the rotating shaft 1.

After excavation is started from the ground surface and excavated for several tens cm to 1 m, the excavated soil is discharged by raising the rotating shaft 1. The volume of the excavated soil that has been discharged corresponds to the increase in volume due to the first injection and stirring of the cement milk. (Figure 2
(A)) (2) Work with the discharge blade 3 removed from the rotating shaft 1.

[0016] The first injection of cement milk is started from the time when the inside of the hole is further excavated and excavated by about several tens cm to 1.5 m. (FIG. 2 (b)) (3) Work with the discharge blade 3 removed from the rotating shaft 1 (continuation of (2)).

After the cement milk is injected and the excavated soil is agitated while excavating to a predetermined depth, the rotary shaft 1 is pulled up. Due to the injection of cement milk, the earth and sand inside the borehole is raised. (FIG. 2 (c)) (4) Work with the discharge blade 3 mounted on the rotating shaft 1.

In the same manner as (1), the raised earth and sand is
After excavating about 1 m, the rotating shaft 1 is pulled up and the excavated soil is discharged. The volume of the discharged excavated soil corresponds to the increase in the volume due to the second injection and agitation of the cement milk. (FIG. 2 (d)) (5) Work with the discharge blade 3 removed from the rotating shaft 1.

The second injection of cement milk is started from the time when the inside of the hole is excavated by about several tens cm. (Figure 2
(E)) (6) Work with the discharge blade 3 removed from the rotating shaft 1 (continuation of (5)).

After injecting the cement milk to the deepest part and stirring the excavated soil, the rotating shaft 1 is pulled up. Due to the injection of cement milk, the earth and sand inside the borehole is raised. (Figure 2
(F)) With the above, the formation of one soil cement pile using the hole stirrer of the present invention is completed. (1) to (6) are repeated to form a large number of soil cement piles.

If the heights of the pile heads vary, this will hinder the underground beam construction work to be provided on the pile heads. Therefore, the pile head processing for removing the soil 8 above the pile heads and adjusting the heights of the pile heads. I do.

In the example of FIG. 2, the cement milk is divided into two parts so that the soil and the cement milk are sufficiently mixed to form a high quality soil cement pile. May be injected. In that case, the excavated soil of the capacity corresponding to the whole amount of cement milk is discharged in the above (1), and in the above (2), the excavated soil is finally excavated by the height of the sediment remaining on the pile head. Start the infusion.

The amount of sediment discharged prior to the injection of the cement milk and the start of the injection of the cement milk are determined in advance based on the condition of the target ground, the amount of the injected cement milk, the pile head level of the soil cement pile, and the like. Must be calculated in advance.

[0024]

As described above, the present invention has the following effects.

(1) An operation of forming a soil cement pile with one machine by a simple operation of attaching and detaching a discharge blade,
Earth removal work can be performed.

(2) By using the drilling stirrer of the present invention, a soil cement pile can be formed by a simple operation without discharging cement milk or cement-containing earth and sand which may cause hard environment pollution. It becomes possible.

[Brief description of the drawings]

FIG. 1 shows a tip of a drill stirrer according to the present invention,
(A) is a perspective view when the discharging blade is mounted, (b) is a side view when the discharging blade is mounted, and (c) is a bottom view of the discharging blade.

FIG. 2 is a longitudinal sectional view showing the steps of a construction example of forming a soil cement pile using the drilling and stirring machine of the present invention.

[Explanation of symbols]

1. Rotary shaft, 2. Stirring blade, 3. Discharge blade, 4.
・ Material for fitting, 5 ・ ・ Drilling blade, 6 ・ ・ Drilling blade mounting blade,
7. Soil cement, 8. Excavated soil.

Claims (1)

(57) [Claims] To 1. A stirring blade of the rotating shaft tip, fitting steel exhaust earth feathers large area far <br/> or more stirring blades and welded to the lower surface
A drill stirrer for soil cement pile construction that is detachably mounted by fitting materials .