JPH0882186A - Construction method of horizontal mortar tunnel - Google Patents

Abstract

PURPOSE: To simplify execution by boring a hole with a casing and an auger machine capable of revolving reversely each other in the case a horizontal tunnel for preventing the collapse of a bedrock is constructed, and forming an earth packer together with earth-moving to fill the hole with rapid hardener. CONSTITUTION: An auger machine 3 is revolved to horizontally bore a hole in a breakable bedrock 1, at the same time, a casing 2 is revolved in the direction opposed to the auger machine 3, and most of excavated earth is moved to the outside of the hole (in a state of c). After that, the auger 3 is revolved reversely, at the same time, the casing 2 is revolved in the direction opposed to the auger 3, earth remaining in the hole is consolidated to form an earth packer 8 (in the state of d). In addition, while filling the hole with mortar and rapid hardener from the front end of the auger 3, the casing 2 and auger 3 are pulled out, and a mortar tunnel 9 is constructed. After the casing and auger are pulled out, the earth packer 8 is collapsed and is washed off with a high pressure washing gun 10. By the constitution, the horizontal mortar tunnel can be simply constructed with high degree of accuracy at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal pile construction method which is one of the construction methods for preventing the collapse of the ground when excavating a tunnel in the collapsible ground.

[0002]

2. Description of the Related Art There are several construction methods for preventing the ground from collapsing when excavating a tunnel in collapsible ground, and one of them is the horizontal pile construction method.

The horizontal pile construction method is as follows: (1) a method of drilling with an auger, pulling out the auger, and then injecting mortar into the hole to construct a mortar pile (2) a bit larger than the diameter of the steel pipe A combination of steel pipes is used to drill holes while protecting the drilled wall surface with the steel pipe, leaving the bit and the steel pipe in the rock ground, and injecting mortar into the gap between the ground pipe and the steel pipe and into the steel pipe. Filling method (3) Drill with a small diameter bit to a predetermined depth, expand the bit at the stage of withdrawing the bit, and inject the cement milk while expanding the hole from the back to make a solid soil. A typical method is to mix and stir to construct a soil mortar pile.

[0004]

According to the conventional method (1), in the case of a soft ground layer such as a sand layer, the wall surface for drilling does not stand by itself,
Construction of horizontal piles may not be possible. In the construction method (2), since the bit and the steel pipe are left in the mountain,
As the material cost increases, bits and steel pipes hinder the excavation work during the facet excavation work after the facet self-supporting work. Further, it is necessary to provide a backflow prevention plug for the injected material in the steel pipe, which complicates the device. Although the construction method (3) is an inexpensive and highly practical construction method, it has a problem that the mechanism of the expansion / contraction bit is complicated and the pile strength is difficult to control.

[0005]

The present invention is directed to a casing
Using an auger machine, while protecting the wall surface of the hole with a casing, the hole is excavated and a horizontal pile made of rapid-hardening mortar is constructed at the trace of excavated earth and sand. By rotating each independently and controlling each rotation direction, excavation,
A series of processes such as excavation of excavated soil, formation of mortar leakage prevention plugs, and construction of horizontal piles can be constructed by simple operations. Therefore, according to the construction method of the present invention, the construction can be simplified, the construction cost can be reduced, and the pile having a predetermined strength can be accurately constructed.

That is, according to the present invention, a casing / auger machine having a casing around the auger and a double pipe for injecting an injecting material inside the shaft of the auger is installed at a predetermined position of the face, and (A) auger is installed. In the excavation direction (forward direction), and while rotating the casing in the opposite direction to the auger, advance the casing / auger machine to discharge most of the excavated earth and sand outside the hole and leave some in the casing. (B) Rotating the auger in the opposite direction and rotating the casing in the opposite direction to the auger so that the excavated earth and sand remaining in the casing is transferred to the tip of the auger. The process of consolidating and constructing a sediment packer,
(C) While injecting the mortar and the rapid hardening material into the drill hole through the double pipe, the auger is rotated in the opposite direction, and the casing is rotated in the same direction as the auger at the same rotation speed, while the casing auger is being rotated. Back the plane,
The process of constructing a horizontal pile with rapid hardening mortar in the drill hole, (D) Rotating the auger of the casing / auger machine pulled out from the drill hole in the opposite direction, and rotating the casing in the opposite direction to the earth and sand The present invention relates to a horizontal mortar pile construction method, which is characterized by sequentially performing the steps of collapsing and discharging packers.

[0007]

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

FIG. 1 is a process vertical sectional view showing a construction procedure of a horizontal mortar pile construction method of the present invention. The construction procedure of the present invention will be described with reference to FIG.

(1) A trolley (not shown) is fixed, and a casing / auger machine is installed at a predetermined position on the face 1. The casing / auger machine has a bit at the tip and an auger 3 having a rotating shaft with a screw blade, and a casing 2 which is arranged around the auger 3 and rotates independently of the auger 3, and is inserted into the rotating shaft of the auger 3. The double tube 6 is formed into a double tube 6, and the tip of the double tube 6 is open to the tip of the auger 3. The auger 3 is rotated by an auger rotation motor 5, and the casing 2 is rotated by a casing rotation motor 4. (Fig. 1 (a)) (2) Rotate the auger 3 in the digging direction (clockwise rotation in the diagram), and move the casing / auger machine forward while rotating the casing 2 in the direction opposite to the auger 3 (clockwise rotation in the diagram). Then, excavation is started while discharging the excavated earth and sand 7 to the mouth side. (Fig. 1 (b)) (3) When the excavation is continued to reach a predetermined depth, the excavated sediment 7 required for constructing the sediment packer in the next step is formed in the casing 2.
The rotation of the auger 3 and the casing 2 is stopped, and the excavation is completed. (Fig. 1 (c)) (4) Opposite the auger 3 in the direction opposite to the excavation direction (clockwise rotation in the figure)
The casing 2 is rotated in the direction opposite to that of the auger 3 (clockwise in the figure), and the excavated soil remaining in the casing 2 is compacted at the tip of the auger 3 to construct the soil packer 8. . (Fig. 1 (d)) (5) Pass the mortar through the inner pipe 6A of the double pipe to the auger 3
And the injection injection into the hole is started. At the same time, the rapid hardening material is also injected and injected into the feed hole at the tip of the auger 3 through the double-tube outer tube 6B. With the start of injection and injection, the auger 3 is rotated in the direction opposite to the excavation direction (counterclockwise rotation in the figure), and the casing 2 is also rotated in the same direction as the auger 3 (counterclockwise rotation in the figure) to remove the casing / auger machine. Start. (FIG. 1 (e)). In order to improve the bending strength of the mortar pile to be constructed, it is preferable to premix the mortar to be injected with a fibrous reinforcing material.

(6) While constructing the mortar pile 9 by stirring and mixing the injected mortar and the rapid hardening material, the auger 3 and the casing 2 so as not to collapse the earth and sand packer 8.
Continue to pull out the casing auger machine while keeping the same rotation speed. (Fig. 1 (f)) (7) The pulling out of the casing / auger machine is completed, and the construction of the mortar pile 9 is completed. (Fig. 1 (g)) (8) Rotate the auger 3 of the casing auger machine pulled out from the excavation hole in the direction opposite to the excavation direction (counterclockwise rotation in the figure) to move the casing 2 in the opposite direction to the auger 3 (in the figure, Rotate to the right) to collapse the earth and sand packer 8. The earth and sand adhering to the tip of the auger 3 is washed off by the high pressure washing gun 10. (FIG. 1 (h)) In this way, the horizontal mortar pile 9 is constructed at one predetermined position of the face 1.

By repeating this construction procedure, a predetermined number of mortar piles 9 are constructed at a plurality of predetermined positions.

[0012]

EFFECTS OF THE INVENTION The present invention (1) excavates and discharges excavated earth and sand by rotating the casing and the auger independently and controlling their respective rotating directions and rotating speeds.
Since a series of steps such as formation of a mortar leak prevention plug and construction of horizontal piles can be performed by simple operations, the construction becomes simple and the construction cost is reduced. (2) Since the excavated soil is replaced with mortar to construct a horizontal mortar pile, a pile having a predetermined strength can be constructed accurately. And other effects.

[Brief description of drawings]

FIG. 1 is a process vertical sectional view showing a construction procedure of a horizontal mortar pile construction method of the present invention.

[Explanation of symbols]

1 ... Face, 2 ... Casing, 3 Auger, 4
・ Casing rotation motor, 5 ・ ・ Auger rotation motor, 6 ・ ・ Double pipe, 6A ・ ・ Double pipe inner pipe, 6B ・ ・
Double pipe outer pipe, 7 ... excavated sediment, 8 ... sediment packer, 9
..Mortar piles and 10. High-pressure washing guns.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Higuchi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Within Kashima Construction Co., Ltd. (72) Inventor Akio Suzuki 1-2-7, Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yoichiro Nakamura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) In-house Takaya Matsumoto 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A casing / auger machine having a casing around the auger and a double pipe for injecting an injection material inside the shaft of the auger is installed at a predetermined position of a cutting face, and The casing auger machine while advancing the casing auger while rotating the casing in the direction opposite to the direction of the auger, to remove most of the excavated earth and sand from the hole and leave a part of the excavated hole in the casing. Step of excavating to a predetermined depth, (B) Rotate the auger in the opposite direction and rotate the casing in the opposite direction to the auger to condense the excavated earth and sand remaining in the casing to the tip of the auger. The step of constructing the packer, (C) While injecting the mortar and the quick hardening material into the drill hole through the double pipe, the auger is rotated in the opposite direction, and the casing is in the same direction as the auger. A step of retracting the casing auger machine while rotating it at a rotational speed to construct a horizontal pile made of rapid-hardening mortar in the drill hole, (D) reversing the auger of the casing auger machine pulled out from the drill hole A horizontal mortar pile construction method characterized by sequentially performing the steps of rotating and rotating the casing in the opposite direction to the auger while collapsing and discharging the sand and sand packer.