JPH06100071B2 - Horizontal auger with expanding blade - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a horizontal auger equipped with an expanding bit.

[Prior Art] In a mountain tunnel, a face (a newly dug portion) must be self-sustaining for a short period of time when the support of the surrounding wall is constructed. If it is not self-sustaining, if it is mildly collapsible, then normal pre-emptive work (4 to 2 m) is used. However, when it comes to collapsible sandy soil or gravel that has almost no adhesive force, or crushed zones (rocks), a long preparatory work is required.

In this prior work, every other hole is conventionally drilled by a rock drilling machine as shown in FIG. 11 to inject a fixing material, and a reinforcing bar / pipe or a steel sheet pile is inserted. These fore piles act as beams to protect the crown, and the face stabilizing arch J is constructed.

[Problems to be Solved by the Invention] However, during drilling, drilling water loosens the ground around the face and promotes deterioration, or the top and bottom soil is pulled out from between the fore piles. Further, when the fore pile is placed, the ground is cut off from the lower surface soil of the fore pile, so that the lower surface sediment is often peeled off and dropped.

In addition, the conventional pile naturally has a larger compressive strength as the length and diameter are larger. However, it is difficult to excavate a long and large-diameter hole with a horizontal auger, and the excavation and the injection of the solidifying material are performed in separate steps, which results in poor workability.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a horizontal auger provided with an expanding blade bit capable of forming a pile of a long and large diameter face stabilizing arch with good workability.

[Means for Solving the Problems] According to the present invention, an inner cylinder slidably in contact with each other and relatively movable in the axial direction, and an outer cylinder provided with screw blades on the outer circumference,
A pair of first bits whose front end portions are pivotally attached to one pivot of the inner cylinder end portion and are continuously formed with mutually obtuse angles and parallel excavation portions, and a front end portion is a rear end portion of the first bit. A pair of second bits pivotally attached to the front end of the outer cylinder to form a drilled portion on the outer side, and an inserted injection cylinder having a gap in the inner cylinder, An inner hole of the injection cylinder and a check valve for opening the solidified material passing through the gap when the solidified material has a predetermined pressure and mixing and ejecting the both solidified materials are provided.

[Operation] In the horizontal auger including the expanding blade bit configured as described above, the pilot hole is excavated with the first bit in the original position, and the outer cylinder is retracted by the predetermined stroke after excavating the first bit to the first position. The second bit is expanded through the bit of the, the auger is pulled out to excavate the pile hole having a larger diameter than the pilot hole, and the solidified material of a predetermined pressure is injected through the check valve to be solidified by both bits. The excavated soil is stirred, and at a predetermined depth from the entrance, the bit is closed and returned to its original position to form a pile, and these piles construct an arch for stabilizing the face.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, an inner cylinder 4 is slidably inserted into an outer cylinder 1 provided with screw blades 2 on the outer periphery of a horizontal auger generally indicated by A, and a gap is formed in the inner cylinder 4. The injection cylinder 8 is inserted with C provided.

A pin 5 is provided axially on an extending portion 4a formed at the front end of the inner cylinder 4, and a front end of a pair of first bits 6, 6 is pivotally attached to the pin 5. In the original position shown in the drawing, the bits 6 and 6 are continuously formed with a digging portion 6a having an obtuse angle and a parallel digging portion 6b. At the rear ends of the bits 6 and 6, a pair of second bits 7 and 7 having an excavated portion 7a formed on the outside are pivotally attached by pins 5a and 5a. The ends are attached to the yoke-shaped brackets 3 and 3 provided on the front end of the outer cylinder 1, respectively, by the pin 5
It is pivotally connected by b and 5b. The distance between the pins 5b and 5b is slightly smaller than the distance between the pins 5a and 5a.
Therefore, when the inner cylinder 4 is retracted (rightward in the drawing) by a predetermined stroke S by a cylinder (not shown), the second bits 7 and 7 are moved by the first bits 6 and 6 as shown by the chain line. It is supposed to be expanded.

On the other hand, between the inner cylinder 4 and the injection cylinder 8, a check valve generally indicated by 9 is provided. This check valve 9
A valve seat portion 10 fitted in the inner hole of the inner cylinder 4 and formed with a valve seat 10a.
A valve body 11 which is seated on the valve seat 10a from the outside, and a spring 13 interposed between the valve seat portion 10 and a ring 12 which will be described later. On the outer periphery of the rear end of the valve body 11, a ring 12 slidably contacting a front inner hole of the injection cylinder 8 is fixed, and an inner hole 11a for communicating the inner hole of the injection cylinder 8 and the gap C side.
And a through hole 11b orthogonal to the inner hole 11a is bored. Then, the ring 12 includes the first solidifying material on the side of the gap C and the injection cylinder 8
The second solidifying material is defined, the valve body 11 is opened at a predetermined pressure of both solidifying materials (for example, 1.5 kgf / cm ² ), and both solidifying materials are ejected to the pin 5 side. .

The horizontal auger A, as shown in FIG.
It is set on the auger machine indicated by. This auger machine B is of a self-propelled type, and on a table 20 which can be swung up and down, a base 21 which is movable by a stroke S1 is provided, and a horizontal auger A is attached to the base 21, and a speed reducer 22 is provided. Through oil motor
The outer cylinder 1 and the inner cylinder 4 are synchronously rotated by 23, and the injection cylinder 8 and the gap C are provided with a swivel joint 24 and two tubes 25a (only one is shown in FIG. 5). Are connected to a solidifying material supply pump (not shown).

At the time of construction, as shown in Fig. 6, position # along the construction line
Every other one, for example # 2, with a predetermined pitch.
Form pile D up to 10, then positions # 11, # 12 ... #
The pile E is formed so as to overlap 19 and the pile D previously formed, and the arch F for stabilizing the face is constructed by these piles D and E.

At the time of excavation, as shown in FIG. 7, the horizontal auger A is rotated with the first bits 6 and 6 in the original position, and the base 21 is advanced to excavate the pilot hole K to a predetermined depth.

Then, as shown in FIG. 8, the cylinder is contracted by a predetermined stroke to retract the inner cylinder 4, and the second bits 7 and 7 are opened via the first bits 6 and 6.

Next, as shown in FIG. 9, a pilot hole L having a larger diameter than the pilot hole K is excavated at the excavating portions 7a, 7a of the second bit 7, 7 to form a gap between the first and second solidified materials having a predetermined pressure. C, pressure is fed from the injection cylinder 8, the check valve 9 is opened, the base 21 is retracted while ejecting as shown by the arrow, and the horizontal auger A is pulled out.

Then, as shown in FIG. 10, the inner cylinder 4 is advanced a predetermined stroke from the inlet portion at a predetermined depth M (for example, 300 to 500 mm) to move the second bits 7 and 7 through the first bits 6 and 6. Shrink and form pilot holes K, and form pile D 1
Complete the pile of books and move on to the next location.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, after closing the first bit to excavate a small-diameter pilot hole, the second bit is opened to guide the pilot hole to a large size. The diameter of the pile hole can be easily excavated, and the solidified material is injected and stirred to form a long and large-sized pile in one step, and workability can be greatly improved compared to the conventional case.

Further, for example, one pile can form a pile having a uniaxial compressive strength of 10 kgf / cm ² or more in about 5 minutes.

Also, limited implants can be performed without a bulkhead.

Further, the next construction can be performed while changing the construction range and the type of solidifying material according to the ground and confirming the improvement effect.

Further, it is possible to perform the construction mainly by the underground worker.

Moreover, the amount of soil discharged is relatively small, and the solidifying material and the excavated soil can be homogeneously stirred and mixed.

[Brief description of drawings]

1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, FIG. 3 is a front view of FIG. 1, and FIG.
FIG. 5 is a side view of the auger machine, and FIG.
FIG. 6 is a front view of a cutting face for explaining a construction state, FIGS. 7 to 10 are vertical sectional views for explaining a construction process, and FIG. 11 is a front view of a face face for explaining a conventional construction state. A ... Horizontal auger, K ... Pilot hole, L ... Pile hole, 1 ... Outer cylinder, 4 ... Inner cylinder, 6 ... First bit, 7
...... Second bit, 8 ... Injection cylinder, 9 ... Check valve

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masao Matsuyama 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Kenji Yamada 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Matsuo Watanabe 1-2-7 Motoakaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Koya Amano 1-2-2 Motoakaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. An inner cylinder which is in sliding contact with each other and is relatively movable in the axial direction, and an outer cylinder having screw blades on its outer periphery, and a front end portion pivotally attached to one pivot of the inner cylinder end portion and mutually obtuse angles. And a pair of first bits in which parallel excavation portions are continuously formed, and a front end portion is pivotally attached to a rear end portion of the first bit and a rear end portion is pivotally attached to a front end portion of the outer cylinder. A pair of second bits having an excavated portion formed on the outside, an injection cylinder inserted with a gap in the inner cylinder, an inner hole of the injection cylinder, and a solidifying material passing through the gap at a predetermined pressure A horizontal auger equipped with a blade for expanding blades, which is provided with a check valve that opens and mixes the two solidified materials and ejects them.