JPH10153083A - Master and slave shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a work for continuously excavating those tunnels ranging from a middle diameter to a small diameter ones. SOLUTION: A cutter head 2 rotatable about a shield axis O is installed on a middle diameter master shield main body 1 at the front part. Also a cutting position A for cutting according to the outside diameter of a slave shield main body 3 when an excavating is moved to a small diameter tunnel excavating is set on a cutter head 2 which is provided with a master copy cutter 13b projectable to the outer peripheral part of it. In addition, a slave cutter device 14 which is provided with a slave copy cutter 14b projectable from the cutting position A to the outer peripheral part of it is incorporated in the cutter head 2 in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parent-child shield excavator capable of continuously excavating a small-diameter tunnel from a medium-diameter tunnel having a diameter of 4 m or less.

[0002]

2. Description of the Related Art Conventionally, in the shield method, for example, when excavating a track portion continuously on a platform of a station, a shield body of a small-diameter shield excavator is built in a shield body of a large-diameter shield excavator. There has been proposed one in which a medium-diameter shield body is directly started from a large-diameter shield body.

[0003]

By the way, in the excavation of a medium to small diameter tunnel having a diameter of 4 m or less, such as a sewage hole,
Since the size of the shield machine is small, its internal volume is small, and it is difficult to directly start the vehicle by incorporating many parts of the shield body for small-diameter drilling inside the body of the medium-diameter shield like a large-diameter shield machine. is there. Therefore, there is a problem that it takes time to carry in and assemble parts of the shield excavator for small-diameter excavation when moving from excavation of the medium-diameter tunnel to excavation of the small-diameter tunnel.

SUMMARY OF THE INVENTION An object of the present invention is to provide a parent and child shield excavator capable of solving the above problems and smoothly transitioning from a middle diameter tunnel to a small diameter tunnel.

[0005]

In order to achieve the above object, an invention according to claim 1 of the present invention is a parent-child shield excavator for excavating a small-diameter tunnel following excavation of a medium-diameter tunnel, A large-diameter parent shield body is provided with a cutter head that can rotate around the shield axis at the front, and a small-diameter child shield body is placed on the shield axis inside the parent shield body and protrudes to the outer periphery. In the cutter head having a free parent copy cutter, a cutting position for cutting in the circumferential direction corresponding to the outer diameter of the child shield body at the time of transition to small-diameter tunnel excavation is set, and the cutting position is set in the cutter head. A child copy cutter, which can protrude outward from the outer side, is built in in advance.

According to the above construction, since the child copy cutter is built in advance in front of the cutting position of the cutter head, it is possible to omit the assembling work in the child shield main body when shifting from the middle diameter tunnel to the small diameter tunnel. The work time required for starting can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a parent-child shield machine according to the present invention will be described with reference to FIGS.

This shield excavator has, for example, a diameter D1.
A small diameter tunnel having a diameter of D2 = 2.2 m can be continuously excavated from a medium diameter tunnel having a diameter of D = 3.5 m, and a cutter head 2 is centered on a shield axis O in front of a main shield body 1 having a medium diameter. And a small-diameter child shield body 3 is built in the shield axis O inside the parent shield body 1.

The main shield body 1 includes a front body 1a and a rear body 1b.
The connecting portion of the skin plate has a spherical receiving portion 4a.
And the main spherical bearing 4 composed of a spherical sliding contact portion 4b, and can be bent within a predetermined angle range by a main connecting shaft fitting 5 and a main middle bending jack 6. At the front of the parent shield main body 1 and the child shield main body 3, a pressure bulkhead 8 is provided which forms a pressure chamber 7 for holding the face pressure at which the cutting face collapses. And the parent partition wall 8b inside the child shield main body 3, and the parent pressure partition wall 8a is detachably connected to the child shield main body 3 by a parent-child fastening bolt 8c.

A bearing 9 is provided at the shield shaft center of the pressure bulkhead 8.
The cutter drive shaft 10 is rotatably supported via the shaft, and the cutter head 2 is fixed to the tip of the cutter drive shaft 10. A turning gear 11 is provided at the rear end of the cutter drive shaft 10.
and a cutter driving device 11 comprising a driving pinion 11b meshing with the driving pinion 11a and a cutter driving motor 11c for rotating the driving pinion 11b. The cutter head 2 has a sediment inlet (not shown) formed at a predetermined position on a circular cutter face plate, and a center bit 12 and a number of cutter bits (not shown) are provided on the front surface. . Also, at a predetermined position on the outer peripheral portion, the retractable cylinder 13 is provided.
The parent copy cutter device 13 which makes the copy cutter 13b protrude on the outer peripheral portion by a. Further, a cutting position A for reducing the outer diameter of the cutter head 2 is set in the cutter head 2 corresponding to the diameter of the small diameter tunnel (the outer diameter of the child shield main body 3) at the time of transition to the small diameter tunnel. Inside the cutting position A, a child copy cutter device 14 capable of projecting the copy cutter 14b from the cutting position A to the outer peripheral side by the extension / retraction cylinder 14a is built in advance. A stirring blade 15 is provided at a predetermined position on the back of the cutter head 2.

In the child shield main body 3, there is provided an earth discharging device 16 in which a screw blade is rotatably incorporated in a casing through the child partition 8b. Further, at the rear of the main shield body 1, a main erector device 18 for assembling the main segment 17 and a main propulsion jack 19 for advancing the main shield body 1 with the assembled main segment 17 as a reaction force receiver are arranged. ing.

[0012] A procedure for excavating a medium-diameter tunnel and excavating a small-diameter tunnel will be described below. 1. Remove the cables and hydraulic hoses between the parent shield main body 1 and its rear bogie (not shown) so as not to hinder the modification to the child shield.

2. The parent center bending jack 6 of the parent shield main body 1, the parent elector device 18 provided on the rear trunk 1b, and the guide ring gutter of the parent elector device 18 are removed and removed. Note that the parent middle folding jack 6 is the child shield body 3
When diverting for use, temporarily store it.

3. After improving the ground of the cutting face so that there is no inflow of earth and sand, and removing the earth and sand in the pressure chamber 7, the pressure chamber 7
A worker enters the inside and gas is cut in the circumferential direction along the cutting position A. At this time, the parent copy cutter device 13 is cut and deleted, and the child copy cutter device 14 can be used.

4. Further, the hood portion piece formed so as to be able to be carried into the pressure chamber 7 is carried in, and attached by welding or bolt-up from the inside to form the child hood portion 21.
Further, the parent-child fastening bolt 8c is removed, the parent partition 8a is detached from the child shield main body 3, and the child shield main body 3 and the parent shield main body 1 are separated.

5. The child middle folding jack 22 is carried in and assembled into the child shield main body 3. Then, the child rear body 23 of the child shield body 3 divided into four parts is carried in and assembled, and a tail plate 23a is attached from the inner surface.

6. The child propulsion jack 24 diverted from the parent shield is incorporated. 7. The child elector device 25 is loaded and installed, and further, piping and wiring in the child shield main body 3 are performed. The piping and wiring of the hydraulic hose and the cable between the rear bogie and the child shield main body 3 are performed.

According to the above-described procedure, the child shield body 3 can be started from the parent shield body 1 by the child propulsion jack 24 with the child segment 26 assembled by the child elector device 25 as a reaction force receiver, and the child shield body 3 is started. Thus, the small-diameter tunnel can be continuously excavated from the medium-diameter tunnel.

According to the above-described embodiment, even in a shield machine for excavating a medium or small diameter tunnel having a small internal volume, the child shield body 3 is started from the main shield body 1 and the small diameter tunnel is excavated from the medium diameter tunnel. The tunnel can be continuously excavated. Further, since the child copy cutter device 14 is built in advance in front of the cutting position A of the cutter head 2, it is not necessary to newly install the child copy cutter from the narrow pressure chamber 7 side after cutting, and the working time required for starting can be shortened. it can.

[0020]

As described above, according to the first aspect of the present invention, the child copy cutter is built in advance in front of the cutting position of the cutter head. In addition, the assembling work in the child shield main body can be omitted, and the working time required for starting can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a parent-child shield machine according to the present invention.

FIG. 2 is a longitudinal sectional view showing a child shield starting state of the parent-child shield excavator.

[Explanation of symbols]

 Reference Signs List A cutting position O shield axis 1 parent shield main body 2 cutter head 3 child shield main body 8 pressure bulkhead 8a child bulkhead 8b child bulkhead 13 parent copy cutter device 14 child copy cutter device 16 earth removal device 18 parent elector device 19 parent promotion Jack 21 Child hood part 23 Child rear trunk 24 Child propulsion jack 25 Child elector device

Claims (1)

[Claims] 1. A parent-child shield excavator for excavating a small-diameter tunnel following excavation of a medium-diameter tunnel, comprising a cutter head rotatable around a shield axis at a front portion of a large-diameter parent shield body. A small-diameter child shield body is disposed on the shield axis inside the parent shield body, and the cutter head provided with a protruding parent copy cutter on the outer peripheral portion is provided with a small-diameter child shield body when shifting to small-diameter tunnel excavation. A parent-child shield excavator characterized in that a cutting position for cutting in the circumferential direction is set in accordance with the outer diameter of the shield body, and a child copy cutter that is capable of protruding from the cutting position to the outer peripheral side in the cutter head in advance is built in. Machine.