JPH0647914B2 - Water stop device for shield machine - Google Patents

Description

The present invention relates to a water stop device for a shield machine for backing up a tail seal.

[Prior Art] Generally, in a shield machine, as shown in FIG. 8, a segment c is assembled by an erector b at a rear portion of a shield frame a so as to cover an inner wall surface of an excavated tunnel. Then, in order to prevent groundwater from entering between the assembled segment c and the shield frame a, the tail portion of the shield frame a is provided with a tail seal d that is liquid-tightly pressed against the outer wall surface of the segment c. .

[Problems to be Solved by the Invention] However, in the conventional shield machine, since the tail seal d is exclusively used for stopping water, the tail seal d may be damaged during excavation in a place with a lot of groundwater. In the case of damage, there is a risk that groundwater may enter the shield frame a and the tunnel, causing the shield machine to be submerged.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art. Even if the tail seal is broken, water can be stopped between the segment and the shield frame, and the shield machine can be submerged. It is an object of the present invention to provide a water stop device for a shield machine that can prevent the occurrence of the above.

[Means for Solving the Problems] The present invention relates to a shield machine for a shield machine, wherein a tail seal is provided at a rear portion of a shield frame for sealing between an inner peripheral surface of the shield frame and an outer peripheral surface of an existing segment. A water blocking flange extending inward in the radial direction is provided in the shield frame in front of the segment, and a cylindrical slide ring formed at the tip of the water blocking flange with a diameter smaller than the inner diameter of the existing segment. An actuator is provided that is movable in the axial direction while maintaining liquid tightness and that moves the slide ring axially rearward until it overlaps the existing segment, and at the time of the overlap, the slide ring outer peripheral surface and the existing segment inner peripheral surface are separated. A seal member for sealing the space is provided on the outer peripheral surface of the slide ring.

[Operation] According to the above configuration, when the tail seal is damaged, the water that tries to enter the mine through between the inner peripheral surface of the shield frame and the outer peripheral surface of the existing segment is stopped as follows. It

First, the slide ring is moved axially rearward by the actuator until it overlaps the existing segment. Then, the seal member provided on the outer peripheral surface of the slide ring is pressed against the inner peripheral surface of the existing segment to seal between the outer peripheral surface of the slide ring and the inner peripheral surface of the existing segment. As a result, the water trying to enter the mine is liquid-tightly sealed in the room defined by the water blocking flange, the slide ring, the seal member and the existing segment,
It does not gush into the mine.

That is, if the tail seal on the outer peripheral surface of the existing segment is damaged, water can be stopped from the inner peripheral surface side of the existing segment by the slide ring, the seal member, or the like.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 is a cylindrical shield frame that forms the outer shell of a shield machine, and a cutter 2 for excavating the natural ground is rotatably provided at the front end of the shield frame by a center shaft support structure. , The motor 4 through the carrier 3
It is designed to rotate when driven. The inside of the shield frame 1 behind the cutter 2 is partitioned into a front and a rear by a bulkhead 5, and a mud sending pipe 6 and a mud sending pipe 7 are connected to the bulk head 5 in order to discharge the excavated sediment by slurry transportation. .

In the rear part of the shield frame 1, a segment 9 is assembled by an erector 8 which will be described later so as to cover the excavated tunnel, and in the tail part of the shield frame 1, between the outer wall surface of the assembled segment 9 and Is provided with a tail seal 10 for sealing. Further, on the inner wall surface of the shield frame 1, a ring girder 11 extending inward in the radial direction in a flange shape for reinforcement and water stoppage is provided.
The ring girder 11 is provided with a jack 12 for excavation for pushing the end of the segment 9 to obtain thrust.
Is attached multiple times. The ring girder 11 corresponds to the water stop flange in the claims.

A ring bearing 14 that slidably supports a cylindrical slide ring 13 along the axial direction of the shield frame 1 is provided in a liquid-tight and integrated manner via the ring girder 11. Reference numeral 15 is a seal ring attached to the inner surface of the ring bearing 14. Slide ring 13
Is formed to have a size such that it can be inserted into the assembled segment 9 with a predetermined clearance to allow curve construction when it is moved rearward, and the slide ring 13 has a rear end portion with an inner wall surface of the segment 9. An elastic seal member 16 made of rubber or the like that seals the space between the two is replaceably attached via a seal retainer plate 17 and a seal stop bolt 18. As shown in FIG. 5, the seal member 16 is supported by a seal retainer plate 17 so that its peripheral portion faces forward, and when the tail seal 10 is damaged, the inflowing groundwater pressure can be pressed to stop the water. At the same time, the seal member 16 is prevented from reversing when the slide ring 13 is returned and moved forward. The above ring girder 1
In order to seal the penetrating portion of the propulsion jack 12 in FIG. 1, a water blocking packing 20 is provided between the flange 19 of the propulsion jack 12 and the ring girder 11 as shown in FIG.
Is installed.

As shown in FIG. 4, a pair of anti-rotation pieces 21 are attached to the slide ring 13 to prevent rotation, and between the anti-rotation pieces 21 are extended from ribs 22 provided on the back surface of the bulkhead 5. The locked detent bar 23 is engaged. A sliding jack 24 is provided between the rib 22 and the slide ring 13 to return the slide ring 13. The sliding jack 24 moves the slide ring 13 axially rearward until it overlaps the existing segment 9, and corresponds to the actuator in the claims.

Inside the slide ring 13, an erector 8 for assembling the segment 9 is provided. The erector 8 includes a slewing ring 26 rotatably supported in the slide ring 13 via a guide roller 25, and the slewing ring 26.
It has the same structure as a normal erector equipped with a motor 28 for rotationally driving the motor through a gear 27 and a segment gripping device 29 movable in the radial direction. Then, the erector 8 can assemble the frontmost segment 9a at a position where the slide ring 13 is moved forward.

In the above configuration, the slide ring 1 which is a water stop device
3 is normally in a state of being moved forward, and in this state, the erector 8 is located in a portion for assembling the foremost segment 9a. Therefore, while performing excavation work as in a conventional shield machine as shown in FIG. Assembly of segments can be performed.

On the other hand, when the tail seal 10 is damaged during excavation in a place where much groundwater is present, the slide ring 13 is moved rearward by the slide jack 24, as shown in FIG.
The seal member 16 is brought into pressure contact with the inner wall surface of the segment 9 already assembled in a ring shape. Thereby, the ring girder 11 having the water blocking packing 20, the ring bearing 14 having the seal ring 15, the slide ring 13 and the seal member 16 are provided between the shield frame 1 and the segment 9.
With this, it is possible to stop water so that the groundwater that is sealed from the inside and that enters from the damaged portion of the tail seal 10 does not further enter the mine. Therefore, the shield machine can be protected from being submerged in water, and the safety of the worker and the protection of the work machine can be achieved.

If the water can be stopped in this way, the chemical injection nozzle is projected into the ground from the segment 9 or the like to inject the water-stopping chemical to stop the water in the ground, and then the tail seal 10 is repaired. By moving the slide ring 13 forward, excavation and segment assembly work can be resumed.

The cross-sectional shapes of the shield frame 1 and the slide ring 13 are not limited to circular shapes, and may be rectangular shapes as shown in FIG. 7 or oval shapes. Further, the shield machine may be of a hand digging type, a mud pressure type, or the like.
Further, the seal member 16 may be attached in multiple stages. Also,
On the inner surface of the slide ring 13, scaffolding / reinforcing columns may be provided in addition to the erector 8.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) Even if the tail seal should be damaged, the space between the segment and the shield frame can be sealed from the inside just by moving the slide ring to the segment side, so the shield machine will not be submerged. Can be prevented.

(2) Therefore, the worker's safety and the work machine can be protected.

(3) Since it is possible to prevent submersion in water, geological improvement in the ground and repair of the tail seal can be performed from inside the tunnel, and the work can be restarted quickly.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is an enlarged sectional view of part B of FIG. 1, and FIG. FIG. 5 is a sectional view taken along the line CC in FIG.
Part enlarged view, FIG. 6 is a vertical cross-sectional view showing a water-stop working state, FIG.
FIG. 8 is a schematic transverse sectional view showing a modified embodiment, and FIG. 8 is a longitudinal sectional view showing a conventional shield machine. In the figure, 1 is a shield frame, 9 is an existing segment, 1
0 is a tail seal, 11 is a ring girder as a waterproof flange, 13 is a slide ring, 16 is a shield member,
Reference numeral 24 is a sliding jack as an actuator.

Claims (1)

[Claims] 1. A shield machine for a shield machine, comprising a tail seal for sealing between an inner peripheral surface of the shield frame and an outer peripheral surface of an existing segment in a shield frame in front of the existing segment. A watertight flange that extends liquid-tight inward is provided, and a cylindrical slide ring formed at the tip of the watertight flange with a diameter smaller than the inner diameter of the existing segment moves axially while maintaining liquid-tightness. A seal member that can be provided so as to move the slide ring axially rearward until it overlaps with the existing segment, and a seal member that seals between the outer peripheral surface of the slide ring and the inner peripheral surface of the existing segment when the slide ring overlaps A water stop device for a shield machine, which is provided on the outer peripheral surface.