JP2002070474A - Method and device for starting branched shield by shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for starting a shield, enable the branched shield to be directly started from a main tunnel without constructing a shaft. SOLUTION: A shield machine (1) is made to advance for excavation by being provided with a cutter having a diameter contracting means enabling the excavation of the main tunnel and the branched pit. When the shield machine (1) arrives at a prescribed branched position of the main tunnel, the diameter of the cutter is contracted, a cutter driving part (7) is retreated and retracted into the shield machine (1), the shutter (4) of the front face is closed, the driving part (7) is rotated toward a branched start direction, the skin plate (17) of the main tunnel shield is pulled out into the pit, and the driving part (7) is started as a branched shield machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of starting a branch shield using a shield excavator (hereinafter referred to as a shield machine) in which a branch mine has a smaller diameter than the main mine and can directly start a branch shield from the shield main mine. Related to the device.

[0002]

2. Description of the Related Art In order to fork a tunnel at a right angle or an angle close thereto, a shield machine is reached to an intermediate or reaching shaft, and the angle of the same or another shield machine is changed by using the shaft to restart. Techniques for causing this are known. And it is necessary to build the shaft in the branch part from the ground.

[0003] Recently, a spherical shield construction method that enables continuous construction without using a rotating shaft, and an underground stalk construction method in which a branch shield machine is incorporated in a main shaft shield machine have been proposed.

When constructing a shaft and a horizontal shaft, the shaft is excavated while retaining the ground with a sheet pile or the like while facing the ground, and then a shield machine is inserted into the shaft, and the horizontal shaft is excavated from there. In general, a spherical shield method has been proposed in which a vertical shaft and a horizontal shaft can be constructed with a single excavator.

[0005]

In the above-mentioned technology, when a shaft is constructed at a position where the vehicle starts and branches, a dedicated machine for excavation is required, the work is complicated, and problems such as construction period and land acquisition are required. In addition, the cost increases.

In addition, the rhizome construction method has a problem that a shield machine different from the shield machine for the main shaft needs to be prepared.

Therefore, according to the present invention, it is possible to start a branch shield machine in a direction different from that of a main shaft without providing a shaft, and to branch by a shield machine that does not require a shield machine separately from a shield machine for a main shaft. It is an object of the present invention to provide a method and an apparatus for starting a shield.

[0008]

According to the method for starting a branch shield by a shield machine according to the present invention, a method for starting a branch shield by a shield machine in which a branch shield is started directly from a shield main shaft is provided. Attaching a cutter having a diameter reduction means capable of excavating the main shaft and branch shaft, excavating, when reaching a predetermined branch position of the main shaft, reducing the diameter of the cutter, retreating the cutter drive unit, drawing into the shield excavator, The shutter is closed, the cutter drive unit is turned in the branch start direction, the branch start portion of the skin plate of the main shaft shield is pulled out into the mine, and the cutter drive unit is started as a branch shield machine.

According to the branch shield starting device using the shield machine of the present invention, in the branch shield starting device for directly starting the branch shield from the shield main shaft, the shield machine can excavate the main shaft and the branch shaft. Attach a cutter having a diameter reducing means, configure a drive unit of the cutter so as to be slidable in a shield axis direction and rotatable in a start direction, and provide a shutter for blocking a front surface of the cutter drive unit when the cutter drive unit is retracted. A shutter that can be pulled out into the mine is provided at the branch shield branch start portion of the plate.

As a means for reducing the diameter of the cutter, when the main pit is circular, a large-diameter cutter ring is attached to an overcutter for excavating the branch shield, and the main pit is dug. Separating cutters (leave them away)
Is preferred. When both the main shaft and the branch shaft are rectangular, it is preferable to perform excavation using an overcutter. If necessary, it is preferable to perform a remodeling work to shorten the spokes and incorporate the overcutter when excavating the branch shaft.

[0011]

FIG. 1 is a side sectional view (BB sectional view of FIG. 3) showing a configuration of a shield machine embodying the present invention, wherein both a main shaft shield and a branch shield have circular cross sections. An embodiment of the case is shown.

Partition wall 3 of skin plate 2 of shield machine 1
Is provided with a circular hole 3a (see FIG. 3), and a sealing means 15 (not shown in detail)
An outer guide 5 formed in a cylindrical shape is attached to a base portion having a vertical axis (not shown) through the base, and the base portion is provided inside the skin plate 2 in the skin plate axial direction (the left-right direction in the figure). It is mounted movably.

An inner guide 6 serving as a front body skin plate of the branch shield machine is slidably inserted inside the outer guide 5, and a drive for driving a main shield cutter 8 is inserted inside the inner guide 6. The frame 7a to which the portion 7 is attached is slidably attached, and the driving portion 7 is configured to be slidable in the shield axis direction and rotatable around the vertical axis in the starting direction. Here, reference numerals 5a and 6a
Indicates a stopper. Reference numeral 4 denotes a shutter that closes the hole 3 of the partition wall 3 when the drive unit 7 moves backward (see FIG. 7).

A main shield cutter 8 is fixed to a shaft 7b of the drive unit 7. Referring to FIG. 3, a cutter ring 9 is provided via an over cutter 8b provided on a spoke 8a of the main shield cutter 8. The spoke 9a is locked.

At the rear end of the skin plate 2, a propulsion jack 11 and a tail seal 13, which are well-known techniques, are provided.
A segment 12 is assembled. Here, code 1
0 indicates a screw conveyor.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1. A hole having a size through which the inner guide 6 can penetrate is provided at a position (branch start portion) where the inner guide 6 starts as a branch shield machine from the skin plate 2. A shutter 17 is attached to the hole 20 so that the shutter 17 can be pulled out from the inside through sealing means 18 (not shown in detail).

Referring now to FIGS. 4 to 14, the steps up to the start of the branch shield machine (inner guide 6) will be described. FIG. 4 shows a mode in which the shield machine 1 has reached a predetermined position of the main shaft shield. First, the main shield cutter 8 is stopped, the overcutter 8b is drawn into the spokes 8a of the main shield cutter 8, and the cutter ring 9 is moved to the main position. Separate from shield cutter 8 and screw conveyor 1
The 0 outlet is closed (first step).

Next, referring to FIG. 5, the frame 7a is moved by a jack or the like until it comes into contact with the stopper 6a of the inner guide 6, and the main shield cutter driving unit 7 (hereinafter referred to as the driving unit 7) is moved.
And the main shield cutter 8 are retracted. In this case, the space between the inner guide 6 and the frame 7a is stopped by the sealing means (second step).

Referring to FIG. 6, inner guide 6 is connected to outer guide 5.
Until it comes into contact with the stopper 5a (see arrow).
The operation of the shutter 4 is enabled. Water between the inner guide 6 and the outer guide 5 is stopped by the sealing means in the same manner as described above (third step).

Referring to FIG. 7, shutter 4 is lowered to the rear surface of partition 3 to close partition 3, and main shield cutter 8 is shut off from the chamber in front of the partition (fourth step).

Referring to FIG. 8, in order to prevent the deformation of the shutter 4 due to the earth pressure and the occurrence of water discharge, the partition wall 3 and the front surface of the shutter 4 are filled with a solidifying material 30 and a part of the screw 10 and the shield jack 11 are formed. Are removed (fifth step).

Referring to FIG. 9, the outer guide 5 (entrance portion) is separated from the partition wall 3 and retracted, and is moved together with a vertical axis (not shown) to the start position of the inner (right side in the figure) branch shield (the first position). 6 steps).

Referring to FIG. 10, in the shield machine 1, the outer guide 5 is rotated about a vertical axis (90 in the illustrated example).
°) Orient the outer guide 5 in the starting direction of the branch shield machine (seventh step).

To facilitate the following description, X in FIG.
11, the frame 7a of the drive unit 7 is welded to the inner guide 6 at a position indicated by reference numeral 22, and a propulsion jack 23 and a back truss 24 are attached to the end of the inner guide 6.
Then, the outer guide 5 is moved in the starting direction of the branch shield machine (downward in the figure) and fixed to the inside of the skin plate 2 by welding or the like (eighth step).

Referring to FIG. 12, the shutter 17 provided in advance on the skin plate 2 is pulled out into the pit, and the inner guide 6 is dug in the branching direction by the propulsion jack 23, so that the inner guide 6 is sufficiently in contact with the outer guide 5. Stop in the engaged state (ninth step).

Referring to FIG. 13, a rear trunk 6 is attached to the rear end of the inner guide 6 (which becomes the front trunk skin plate of the branch shield machine).
(c) Attach the shield jack 27, the tail seal 25, the screw conveyor 10, etc., and remove the propulsion jack 23 (tenth step). Here, FIG. 15 corresponds to FIG.
3 shows a YY sectional view.

Referring to FIG. 14, the temporary assembly segment 26 may be installed and the excavation of the inner guide 6 (branch shield machine) may be resumed. Thereafter, the conventionally known steps are repeated (eleventh step).

FIG. 16 shows another embodiment of the present invention in which the main shaft is circular and the branch shaft is rectangular.
Referring to FIG. 17, the inner guide 6 and the outer guide 5 are formed in a rectangular shape, an overcutter 38b for a rectangular shield machine is used for the main shield cutter 38, and details of a means for unlocking the cutter ring 9 are described. Except for this, the configuration is the same as that of the first embodiment.

FIG. 18 shows another embodiment of the present invention in which the main shaft and the branch shaft are both rectangular.
The shield of the main shaft is also formed in a rectangular shape, and the main shaft and the branch shaft are excavated by using the overcutter 38b, and before the branch shield machine starts, the cut-spoke is shortened and the retrofitting work of the overcutter is performed.

[0030]

The present invention is configured as described above, and can provide the following excellent effects. (1) The branch shield can be directly started in a desired direction without constructing a shaft separately from the main shaft shield. (2) A combination of cross-sectional shapes (circular / rectangular) of the main shaft shield and the branch shield can be freely selected. (3) Therefore, the branch tunnel can be excavated safely and inexpensively with a short construction period.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a shield excavator showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a diagram showing a first step of a branch shield starting operation.

FIG. 5 is a diagram showing a second step of the branch shield starting operation.

FIG. 6 is a view showing a third step of the branch shield starting operation.

FIG. 7 is a diagram showing a fourth step of the branch shield starting operation.

FIG. 8 is a diagram showing a fifth step of the branch shield starting operation.

FIG. 9 is a view showing a sixth step of the branch shield starting operation.

FIG. 10 is a diagram showing a seventh step of the branch shield starting operation.

FIG. 11 is a diagram showing an eighth step of the branch shield starting operation.

FIG. 12 is a view showing a ninth step of the branch shield starting operation.

FIG. 13 is a diagram showing a tenth step of the branch shield starting operation.

FIG. 14 is a diagram showing an eleventh step of the branch shield starting operation.

FIG. 15 is a sectional view taken along line YY of FIG. 13;

FIG. 16 is a front view of a shield machine showing another embodiment of the present invention.

FIG. 17 is a side sectional view of FIG. 16;

FIG. 18 is a front view of a shield machine showing another embodiment of the present invention.

[Explanation of symbols]

 2 ... Skin plate 3 ... Partition wall 4 ... Shutter 5 ... Inner guide 6 ... Outer guide 6c ... Rear trunk 7 ... Driver 8 ... Main shield cutter 9 ...・ Cuttering 10 ・ ・ ・ Screw conveyor 11,27 ・ ・ ・ Shield jack 13,25 ・ ・ ・ Tail seal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Sasaki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Katsumi Inomata 1-chome Moto-Akasaka, Minato-ku, Tokyo 2-7 Kashima Construction Co., Ltd. (72) Inventor Hiromasa Igarashi 2-7 Motomoto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. F-term (reference) 2D054 AA03 AC01 AD07 EA07 EA09

Claims (2)

[Claims] 1. A method for starting a branch shield, in which a branch shield is directly started from a shield main shaft, wherein a cutter having a diameter reduction means capable of excavating the main shaft and the branch shaft is attached to a shield machine, and the shield shaft is excavated. When reaching the predetermined branch position, the cutter is reduced in diameter, the cutter drive unit is retracted, retracted into the shield excavator, the front shutter is closed, the cutter drive unit is turned in the branch start direction, and the skin plate of the main shaft shield A method for starting a branch shield in shield excavation, wherein the branch start part is pulled out into a mine and the cutter driving part is started as a branch shield. 2. A branch shield starting device for directly starting a branch shield from a shield main shaft, wherein a shield excavator is provided with a cutter having a diameter reduction means capable of excavating the main shaft and the branch shaft, and a driving unit of the cutter. Slidably in the shield axis direction and rotatable in the starting direction,
A launching device for a branch shield, comprising: a shutter for blocking a front surface of the cutter driving unit when the cutter driving unit is retracted; and a shutter that can be pulled out into a mine at a branch shield branch launching unit of the skin plate.