JPH0366897A - shield tunneling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is applicable to applications ranging from large diameter (for example, inside a station building) to medium and small diameter (
This invention relates to a multi-stage (parent-child) type shield excavator that can continuously excavate track sections.

Conventional technologyFor example, when excavating deep subway tunnels, the inside of the station (
The excavation diameter differs greatly between the large diameter) and the track section (small diameter). Therefore, we used shield tunneling machines with different outer diameters.The large-diameter shield tunneling machine was brought into the tunnel, assembled, excavated the station area, dismantled and carried out, and then the small-diameter shield tunneling machine was brought in and assembled to excavate the railway line area. was digging.

Problems to be Solved by the Invention In the conventional method described above, the work of carrying in, assembling, dismantling, and discharging the shield tunneling machine is complicated and takes a long time.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a shield excavator that can continuously and efficiently excavate tunnels from large diameters to small diameters.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a plurality of shield bodies on the same axis, and fits the shield body on the smaller diameter side into the shield body on the outer peripheral side so that it can be detached and started. A circular cutter head is rotatably provided at the front of the shield body with the smallest diameter, and a ring-shaped cutter head with an inner diameter larger than the inner diameter of the shield body is installed on the front of the shield body with a larger diameter than the smallest diameter shield body. is rotatably provided.

Operation In the above structure, the circular cutter head and the ring-shaped cutter head are rotated with the small-diameter shield body fitted inside the large-diameter shield body to excavate an extremely large-diameter tunnel inside the station premises. After the excavation is completed, the shield body on the smaller diameter side is separated from the largest diameter shield body and started, and the cutter head is rotated to excavate a small diameter tunnel inside the track section. Therefore, it is possible to excavate medium- and small-diameter tunnels continuously from the ultra-large-diameter tunnel.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3.

6 in Figures 1 and 2, 2 is a large-diameter shield body (parent shield) of a two-stage (parent-child type) shield excavator, and the large-diameter shield body 2 is located on the axis A of the large-diameter shield body 2. A small-diameter shield main body (shield 1) protruding forward from 1 is arranged so as to be fixed and detachable. A circular first cutter head 3 is rotatably supported at the front of the small-diameter shield body 1, and a ring-shaped second cutter head 4 whose inner diameter is larger than the small-diameter shield body 1 is supported at the front of the large-diameter shield body 2. Rotatably supported.

First, details of the small diameter shield main body 1 will be explained.

As shown in FIG. 2, the first cutter head 3 has a first earth and sand intake port 1 in a radial direction centered on the center member 11.
2, the first cutter bits 14 disposed on these first cutter face plates, and the first outer peripheral plate 15 that connects the outer peripheral part of the first cutter face plate 13 to the outside. A first copy cutter 16 that can be protruded freely. This first cutter head 3 has a plurality of first supports Ii at the rear! 1117 are provided protrudingly, and these first support legs 1
A first pressure bulkhead 18 attached to the base end of the shield body 7 is rotatably supported by a first annular support 20 fixed within the first skin plate 19 of the small-diameter shield body 2 via a first bearing 21. Ru.

The first pressure partition wall 18 and the first annular support 20 form a first pressure chamber 22 at the rear of the first cutter head 3 that retains the collapse soil pressure of the ground, and the atmosphere at the rear of both shield bodies 1 and 2. It is separated from chamber 5. Further, a first ring gear 23 is attached to the atmospheric chamber 5 side of the first pressure bulkhead 18 via a mounting part, and a reduction gear is connected to a first cutter test motor 24 disposed on the first annular support 20. The first pinion 25 connected and interlocked through the first ring gear 23 is meshed once with the first ring gear 23 and
The cutter head 3 is driven to rotate.

26 is a first mud feeding pipe that passes through the upper part of the first annular support 20 and is connected to the first pressure chamber 22; 27 is a sediment agitation pipe that is provided in the first pressure partition 18 in the center of the first pressure chamber 22; A central agitator 28 is a first agitator provided on the first annular support 20 at the lower part of the first pressure chamber 22, and a central agitator 28 for discharging excavated earth and sand in the first pressure chamber 22 is located near the first agitator 28. A sludge drainage pipe 29 is installed through the first annular support 20 .

3o is a rotary joint for sending hydraulic pressure to the drive section of the first cutter head 3.

A first support frame 31 fixed to the center of the small-diameter shield body 1 has a rear carriage (
A connecting frame 32 (not shown) is connected thereto. At the front of this connection frame 32, a pair of front and rear square-shaped first support members 3 connected by a first connection member 33 are provided.
4 and a first segment assembly device 36 rotatably attached to the front part of the first segment support device 35 are disposed so as to be movable back and forth. through the support to the first
A segment transport device 38 is provided. The first support member 34 of the first support device 35 has four first segment pressing members 37 that are respectively movable in the radial direction. By pressing against the inner surface of the assembled first segment B, the first segment B can be held and the first segment support device 35 and the first segment assembly device 36 can be fixed in position. Therefore, the small-diameter shield main body 1 is digging and the connecting frame 32
Even if the first segment assembly device 36 is moving forward, the first segment assembly device 36
The positioning of the first segment B can be performed accurately in a stopped state, and the assembly work of the second segment B can be performed continuously.

Inside the small-diameter shield body 1, first propulsion jacks 39 whose front ends are supported by the first annular support 20 are arranged at predetermined intervals in the circumferential direction, and the first propulsion jacks 39 are assembled by a first segment assembly device 36. The small-diameter shield main body 1 can be advanced by using the first segment B that has been moved as a reaction force.

Next, details of the large diameter shield main body 2 will be explained.

As shown in FIG. 2, the second cutter head 4 includes a second cutter face plate 43 in which a second soil intake port 42 in the radial direction is formed.
, a second cutter bit 44 disposed on the second cutter face plate 23 , and a second copy cutter 46 that can freely project outwardly through a second outer peripheral plate 45 that connects the outer peripheral part of the second cutter face plate 43 . Consists of.

A plurality of second support legs 47 are protruded from the rear of the second cutter head 4, and a ring-shaped second pressure bulkhead 48 attached to the base end of the second support legs 47 is connected to the large-diameter shield body 4. The inner peripheral plate 50a of the second annular support body 50 is rotatably supported via a second bearing 51 by a second annular support body 50 fixed within the second skin plate 49 of It is movably fitted onto the skin plate 19. The second annular support 50 and the second pressure partition 48 form a ring-shaped second pressure chamber 52 at the rear of the second cutter head 4 for retaining the collapse earth pressure of the ground. Also,
A second ring gear 53 is attached to the atmospheric chamber 5 side of the second pressure bulkhead 48 via a mounting member, and is interlocked to a second cutter drive motor 54 disposed on the second annular support 50 via a speed reducer. The second ring gear 55 that has been
3 and the second cutter head 4 is rotationally driven.

56 is a second mud feeding pipe that passes through the upper part of the second annular support 50 and is connected to the second pressure chamber 22; 58 is a sand sludge provided on the second annular support 50 at the lower part of the second pressure chamber 52; 2nd for stirring
Near the second agitator 58 of the agitator, a second mud draining pipe 59 for discharging the excavated earth and sand in the second pressure chamber 52 is installed.

A second support frame 61 is fixed within the large-diameter shield body 2 at a position rearward from the rear end of the small-diameter shield body 1, and at the rear of the second support frame 61 is a second segment assembly device 62 that can freely rotate in the circumferential direction. will be placed. Moreover, the connection frame 32
Behind the first segment support device 35, there is a second segment support g having a pair of front and rear square-shaped second support members 63.
A c-mount 64 is disposed so as to be movable in the front-back direction. This second
The segment support device 64 has four second segment pressing members 65 that can move in and out of the second support member 63 in the radial direction, and these second segment pressing members 65 are assembled by the second segment assembly device 62. By pressing against the inner surface of the second segment C, the second segment C can be held in a perfect circular shape. 66 is a second segment transport device suspended and supported by the connection frame 32; 67 is a second segment transport device;
This is the second segment loading VC device installed at the exit of the segment conveying device @66.

In addition, a plurality of second propulsion jacks 68 are arranged at predetermined intervals in the circumferential direction inside the large-diameter shield body 2, and the second segment C assembled by the second segment assembly device 62 serves as a reaction force for both shield bodies. 1. Advance 2.

Next, the connecting portion between the large-diameter shield body 2 and the small-diameter shield body 1 will be explained.

The inner circumferential plate 50a of the second annular support 50 is fitted onto the outer circumference of the first skin plate 19 of the small-diameter shield body 1, and the first cutter head 3 is fitted inside the small-diameter shield body 1.
In order to support the rolling force (rotational force) generated by the excavation reaction force of A plurality of anti-rolling keys 74 are disposed, for example, at positions facing each other so as to be freely retractable.
5, it is driven in and out. Further, the rear skin plate 19 of the small-diameter shield body 1 is supported by an outer cylinder support 71 and an inner cylinder support 76 that extend from the second support frame 61 to the outer circumferential side and the inner circumferential side, sandwiching the first skin plate 19. . That is, the first skin plate 19 is bolted to the position adjustment portion 72 at the front of the outer cylinder support 71, and the small diameter shield body 1 is removably fitted and fixed to the large diameter shield body 2, and furthermore, the inner cylinder support The 110 end receiving surface of 76 comes into contact with the operating end of the first propulsion jack 39 to support the force of the small diameter shield main body 1 in the thrust direction. Moreover, this inner cylinder support body 76 is connected to the first propulsion jack 3 when the small-diameter shield body 1 is detached and started.
The first segment B is used as a reaction force receiver for the first segment B, and is assembled between the inner cylinder support 76 and the first propulsion jack 39.

Next, the excavation method using this shield excavator will be explained.

First, an ultra-large-diameter tunnel is excavated with the small-diameter shield body 2 attached to the large-diameter shield body 2 as shown in FIG.

The first copy cutter 16 is driven by the first cutter drive motor 24.
At the same time, the first cutter head 3 is rotated with the first cutter head 3 protruding, and the second cutter head 4 is also rotated by the second cutter drive motor 54, so that the first and second mud feeding pipes 26.56 are connected to the first and second pressure chambers 22. Mud water or mud is injected into the chamber 52 to maintain the collapse earth pressure of the ground in the first and second pressure chambers 22, 52, and remove the soil taken into the first and second pressure chambers 22, 52. Central and first and second agitators 27.28.5
While stirring at step 8, the slurry is discharged from the first and second drain pipes 29.59. Then, the second segment C carried in by the second segment carrying device 66 is transferred to a second segment carrying device 67.
The second segment C is delivered to the second segment assembly device 62 via the second segment assembly device 62, and the second segment C is assembled into a ring shape by the second segment assembly device 62. Then, the second propulsion jack 68 is extended using the assembled second segment C as a reaction force receiver, and both shield bodies 1.2 are advanced.

At this time, by setting the number of revolutions of the first cutter head 3 higher than that of the second cutter head 4, it is possible to prevent the circumferential speed from decreasing in the central part, which occurs when excavating an ultra-large diameter tunnel, and to cut the central part, that is, the first cutter head 3. It is possible to increase speed and efficiently excavate large-diameter tunnels as a whole.

Also, by placing the first cutter head 1 in advance,
When excavating ultra-large diameter tunnels where other mountains are likely to collapse,
The protruding small-diameter shield main body 1 can support the ground above it from below, preventing the ground from collapsing, and making it easy to change the excavation direction and posture of the shield excavator.

When the excavation of the ultra-large diameter tunnel is completed, the shield tanshin machine is temporarily stopped, the position adjustment part 72 of the outer cylinder support 71 and the first skin plate 19 of the small diameter shield body 1 are separated, and the key jack 75 is retracted. Then, the anti-rolling key 74 is extracted from the keyway 73 and stored in the first shield body 1. Further, the second segment support device 64J3 and the second segment transport gc device 66 disposed on the connection frame 32 are disassembled and removed from the connection frame 32. Next, while rotating the first cutter head 3,
The first propulsion jack 39 is extended, and the small-diameter shield body 1 is advanced using the inner cylinder support 76 as a reaction force receiver. When moved forward a predetermined distance, the first propulsion gear 39 is contracted and the first
The first segment B carried in by the segment conveying device 38 is erected between the end receiving surface of the inner cylinder support 76 and the first propulsion jack 39 by the first segment assembling device 36 . By repeating this operation, as shown in FIG. 3, it is possible to continuously excavate tunnels of medium and small diameters following the ultra-large diameter tunnel.

In the above embodiment, the first cutter head 3 of the small-diameter shield body 1 was made to protrude from the second cutter head of the large-diameter shield body 2 to perform preliminary excavation, but as shown in FIG. may be arranged flush.

In addition, the shield body can be made into three or more stages, and the fifth
As shown in the figure, in the case of a large-diameter shield body D, a medium-diameter shield body E, and a small-diameter shield body F, the medium-diameter and small-diameter shield bodies E and F are detached from the large-diameter shield body and started. Alternatively, only the small-diameter shield body F can be detached and started.

Effects of the Invention As described above, according to the present invention, a small-diameter shield body is fitted into a large-diameter shield body, a circular cutter head and a ring-shaped cutter head are rotated to excavate an ultra-large diameter tunnel, and after the excavation is completed, , the small-diameter shield body is separated from the large-diameter shield body and launched. As a result, it is possible to excavate ultra-large diameter tunnels to medium and small diameter tunnels with a single shield excavator, and it is possible to perform efficient excavation, with less work required to carry in, unload, assemble and dismantle the shield excavator, which was required in the past. It can demonstrate its power in tunnel excavation.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a longitudinal cross-sectional view of the shield tunneling machine, Figure 2 is a regenerative front view, Figure 3 is a vertical cross-sectional view of the shield machine in the starting state, and Figure 3 is a vertical cross-sectional view of the shield tunneling machine. 4 and 5 are schematic vertical sectional views showing other embodiments, respectively. DESCRIPTION OF SYMBOLS 1... Small diameter shield main body, 2... Large diameter shield main body, 3... First cutter head, 4... Second cutter head, 18... First pressure bulkhead, 19... First skin plate. , 20... first rM-shaped support, 21... first
bearing, 22...first pressure chamber, 23...first ring gear, 24...first cutter drive motor, 25...first
Pinion, 26... First mud feeding pipe, 29... First mud removal pipe, 31... First support frame, 32... Connection frame,
35... First segment support device, 36... First segment assembly device, 39... First propulsion jack, 48
... second pressure bulkhead, 49 ... second skin plate,
50... Second annular support body, 50a... Inner peripheral plate, 51
...Second bearing, 52...Second pressure chamber, 53...Second ring gear, 54...Second cutter driving motor, 55
...Second pinion, 56...Second mud feeding pipe, 59...
・Second mud removal pipe, 61...Second support frame, 62...Second
Segment assembly device, 64... Second segment support device, 68... Second propulsion jack, 71... Outer cylinder support body, 73... Keyway, 74... Rolling prevention key, 76...・Inner cylinder support, A...axis center, B...first
Segment, C...Second segment.

Claims (1)

[Claims] 1.Multiple shield bodies are provided on the same axis, and the smaller diameter shield body is fitted into the outer shield body so that it can be detached and started, and a circular cutter head is rotatably attached to the front of the smallest diameter shield body. In addition, a ring-shaped cutter head having an inner diameter larger than the shield main body on the inner peripheral side is rotatably provided at the front part of the shield main body having a larger diameter than the minimum diameter shield main body.