JP3163066B2 - 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 as follows: (1) A method of stirring and mixing cement milk and earth and sand while pouring cement milk into a drilling hole after once digging a site plate; ) The drilling, cement milk injection, and the simultaneous mixing and mixing of the cement milk and earth and sand can be roughly classified into two methods, without drilling the site in advance. A considerable volume of sediment spilled out of the ground, and this sediment contained cement, so the spilled out sediment would be treated as industrial waste to pollute the environment,
Disposal is costly, leading to high costs.

As a countermeasure against this, in the method (1), it is known that earth is removed by an amount corresponding to the volume of the injected milk at the time of emptying. This method is used for pile construction on a relatively large scale, and requires at least two types of machines for empty moat, injection of cement milk, and mixing and stirring. If this preliminary earth removal process is applied to the relatively small-scale pile construction of (2), it is necessary to introduce a further excavator for earth removal, and further cost increase is inevitable. .

The applicant has proposed in Japanese Patent Application Laid-Open No. 8-158357 that a discharge blade having a much larger area than the stirring blade is detachably mounted on the stirring blade at the tip of the excavating shaft. That is,
According to Japanese Patent Application Laid-Open No. 8-158357, first, excavation is performed to a predetermined depth while the discharging blade is mounted on the excavating shaft, and then the excavating shaft is pulled up to perform discharging by the discharging blade. (The earth removal amount in this case is the amount of mixed earth and sand that is increased by stirring and mixing of the cement milk and earth and sand by injecting the cement milk.) After the earth removal operation, the earth removal blade is removed and the excavation rotary shaft is again rotated. Insert cement milk while digging, stir and mix to create a pile of soil cement. At this time, as described above, cement milk equivalent to the discharged amount is injected. In this way, a soil cement pile is created. In deep piles, the work is divided into several parts.

[0005] Here, the amount of discharged earth and sand to be performed prior to the injection of the cement milk and the time of the start of the injection of the cement milk depend on the condition of the target ground, the injection amount of the cement milk, and the pile head level of the soil cement pile. It must be calculated in advance.

[0006] However, the earth and sand that has been stirred and mixed is generally in a crisp and porous state, and when applied as calculated, the earth and sand mixed with cement milk tends to rise and overflow. If it is adjusted so that it does not protrude or overflow, a pile close to a crisp porous can be formed, and there is a problem in strength in supporting the upper load of the pile.

The present invention is based on this point, and
This is an invention derived from No. 57. When the cement milk is poured and stirred and mixed with the earth and sand, the earth and sand rises upward from below and tends to overflow, generating a force that makes the ground a reaction force.
Therefore, it is necessary to forcibly restrain the uplift and overflow, to consolidate the soil cement piles to create a strong pile, and to prevent extra overflowing sediment and mixed sediment, and to maintain a good environmental condition. And

[0008]

SUMMARY OF THE INVENTION In a drilling stirrer for a soil cement pile, a drilling agitator for a soil cement pile in which a discharging blade having a much larger area than the stirring blade is detachably mounted on the stirring blade at the tip of the drilling shaft. And a push wing that is supported by a slide leader and that freely holds the excavating shaft, and an engaging device that freely engages with the excavating shaft and rotates with or without the excavating shaft. With a structure.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a push wing 1 attached to a drilling and stirring machine for a soil cement pile method according to the present invention. The top of the cylindrical member 3 that fits into the excavation axis 2
A steady rest locking portion 4 composed of a ring-shaped plate is formed, and a spiral wing plate 5 is formed below the cylindrical member 3. A cut groove 6 is provided at the lowermost portion of the cylindrical member 3 so as to engage with the excavation shaft 2 and rotate together with the excavation shaft 2, and the excavation shaft 2 is provided with a plate-shaped projection 7 to be engaged with the cut groove 6.

FIG. 2 is an example of a top view of the steady rest 8, one end of which is mechanically fixed to a leader of a drilling and stirring machine.
At the other end, the arm 9 can be opened and closed as shown by the arrow in the figure, and is stopped by a pin.

The arm 9 of the steady rest 8 shown in FIG. 2 fits into the groove formed by the two ring-shaped plates of the steady rest locking portion 4 of FIG. Is done. This steadying method is a well-known means.

FIG. 3 is an overall view of the drill stirrer according to the present invention, showing a state where the push wing 1 is attached. 2. Description of the Related Art A slide drilling stirrer is a well-known type used for ground improvement in a narrow place. Reference numeral 8 indicates a steady rest, reference numeral 10 indicates a first slide reader, and reference numeral 11
Is a second slide reader. Reference numeral 12 denotes a cutting blade, and reference numeral 13 denotes a motor. Reference numeral 14 denotes a cement milk injection tube.

Next, the method of applying the soil cement pile will be described step by step, and the push wing will be described. In FIG. 3, first, 40 cm
Drill up to 50cm and excavate. In this case, the earth is efficiently discharged by applying the earth discharging blade disclosed in JP-A-8-158357. At the beginning of the drilling, the steady rest 8 is set to stabilize the excavation shaft protruding long from the ground.

FIG. 4 is a view during drilling. The drilling proceeds while the first slide leader 10 descends along the second slide leader 11. Start injecting milk at the calculated position on the way. The steady rest descends close to the ground.

FIG. 5 is a view in which a hole is drilled to a predetermined position. The steady rest 10 is released, the leader is retracted slightly horizontally, and the wing plate 5 fends off the steady rest 8 and is cut until it is positioned below. Continue the hole. With the wing plate 5 positioned below the steady rest 8, the steady rest 8 is set again.

In this case, the wing plate 5 is spiral and has a plate-like projection 7 of the excavating shaft 2 and a cut groove 6 of the cylindrical member 3.
Engages with the excavation shaft 2 and enters the ground.

At a pre-calculated depth, the motor near the top of the first slide reader 10 is arranged to be pushable, and when this motor is pushed to lower the excavation axis by 5 cm to 6 cm. The plate-shaped projection 7 provided on the excavation shaft 2 is disengaged from the cut groove 6 of the push wing 1, and the rotation of the push wing 1 stops, and simultaneously the drilling and stirring proceeds. Then, the earth is swelled more and more. However, the earth is blocked by the push wing 1 mechanically attached to the slide leader 10 and fixed by the steady rest 8 to be compacted.

Here, the amount of discharged earth and sand to be performed prior to the injection of the cement milk and the time of the start of the injection of the cement milk depend on the condition of the target ground, the injection amount of the cement milk, and the pile head level of the soil cement pile. It must be calculated in advance.

[0019] In this manner, since no extra earth is discharged, there is no industrial waste and environmental hygiene is good, and it is possible to construct not a cramped porous soil cement pile but a compact and strong pile.

[0020]

The effects of the present invention are as follows. (1) By using the drilling stirrer of the present invention, the sediment that tends to overflow by the push wing is suppressed, so that the soil cement pile can be removed without discharging cement milk or cement-containing sediment that may cause environmental pollution. Can be created. (2) In addition, since the sediment that is about to protrude is held down by the push wing, the pile close to the crispy pore is compacted by excavation and agitation, and a soil cement pile with sufficient strength to support the upper load of the pile is created. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a push wing 1 attached to a hole stirrer for a soil cement pile method.

FIG. 2 is a top view of an example of a steady rest.

FIG. 3 is an overall view of a hole stirrer according to the present invention, showing an attached state of a push wing 1;

FIG. 4 is a diagram during excavation with the drilling and stirring machine of the present invention.

FIG. 5 is a diagram in which a hole is drilled to a predetermined position by the hole stirrer of the present invention, and a push wing is acting.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Push wing, 2 ... Excavation axis, 3 ... Push wing cylindrical member, 4 ... Push wing anti-sway locking part, 5 ... Wing plate, 6 ... Cut groove provided on push wing , 7 ... plate-like projections to be fitted into the cut grooves 6, 8 ... anti-sway fittings, 9 ... arms of the anti-sway fittings, 1
0: first slide leader, 11: second slide leader, 12: excavating blade, 13: motor, 14: cement milk injection pipe

Claims (1)

(57) [Claims] 1. A drilling and stirring machine for a soil cement pile in which a discharging blade having a much larger area than the stirring blade is detachably mounted on the stirring blade at the tip of the drilling shaft. And a push wing that is supported by a slide leader and freely holds the excavating shaft, and an engaging device that freely engages with the excavating shaft and rotates or does not rotate with the excavating shaft. A hole stirrer for soil cement pile construction.