JPS62182397A - Cut-off device for shielding excavator - 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 [Field of Industrial Application] The present invention relates to a water stop device for shield digging attack for backing up a tail seal.

[Prior Art] Generally, as shown in Fig. 8, a shield excavator uses a
Assemble segment C using erector b in one moxibustion section. In order to prevent groundwater from entering between the assembled segment C and the shield frame a, a tail seal d is provided at the tail portion of the shield frame a to be fluid-tightly pressed against the outer wall surface of the segment C. .

[Problems to be Solved by the Invention] However, conventional shield excavators rely solely on the tail seal d to stop water. In the event of damage, groundwater will infiltrate into the shield frame a and the tunnel, and the shield excavator will be submerged.
There was a risk of

Therefore, the present invention has been made to solve the problems of the prior art described above, and even if the tail seal is damaged, water can be stopped between the segments 1~ and the shield frame, and the shield tunneling machine It is an object of the present invention to provide a water stop '3A for a shield B32 which can prevent water from submerging in water.

[Means for Solving the Problems] The present invention provides a device for sealing water between the shield frame and a segment assembled by an erector in the rear part of the shield frame. A slide ring having a sealing member is provided so as to be reciprocally movable, and the above-mentioned erector etc. are provided within the slide ring.

[Function] If the tail seal is damaged, just move the slide ring to the segment side, and this slide ring will seal between the segment and the shield frame from the inside.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

In Figures 1 and 2, 1 is a cylindrical shield frame that forms the outer shell of the shield excavator, and a cutter 2 for excavating the earth is rotatably installed at the front end of the frame by a center-shift support structure. motor 4 via gear 3
It is designed to rotate by the drive of. The inside of the shield frame 1 behind the cutter 2 is partitioned by a bulkhead 5 after eruption, and a mud feeding pipe 6 and a mud draining pipe 7 are connected to this bulkhead 5 in order to discharge the excavated earth and sand by slurry transport. There is.

A hole 1'11j is drilled in the rear part of the shield frame 1.
~ Erecta 8, which segment 9 will be described later, covers the channel.
The tail portion of the shield frame 1 is provided with a tail seal 10 for sealing between it and the outer wall surface of the assembled segment 9. Further, a reinforcing ring girder 11 is provided on the inner wall surface of the shield frame 1, and a plurality of digging jacks 12 are attached to this ring girder 11 for pushing the ends of the segments 9 to obtain thrust.

A ring bearing 14 that slidably supports a cylindrical slide ring 13 along the axial direction of the shield frame 1 is provided integrally and liquid-tightly with the ring girder 11 interposed therebetween.

15 is a seal ring attached to the inner surface of the ring bearing 14 1-1. When the slide ring 13 is moved rearward, it is formed in a size that allows it to be inserted into the assembled segment 9 with a predetermined gap that allows curve construction.
At the rear end of the slide ring 13, there is a sealing member 16 made of elastic material such as rubber that seals between the inner wall surfaces of the segments 1 to 9, and a sealing plate 17 and a sealing bolt 18.
are installed interchangeably through the Seal member 16
As shown in FIG. 5, the tail seal 10 is supported by a seal holding plate 17 so that its peripheral edge faces forward, and is designed to suppress the water pressure of inflowing groundwater and stop water if the tail seal 10 is damaged, and also to move forward. The seal member 16 is prevented from being reversed when the slide ring 13 is moved back. In order to seal the open portion of the propulsion jack 12 in the ring girder 11, a water stop gasket 20 is installed between one flange of the propulsion jack 12 and the ring girder 11, as shown in FIG. ing.

To prevent rotation, a pair of anti-rotation pieces 21 are attached to the slide ring 13 as shown in FIG. The detent rod 23 is engaged. Further, in order to return the slide ring 13, a slide jack 24 is interposed between the rib 22 and the slide ring 13.

An erector 8 for assembling the segments 9 is provided within the slide ring 13. The erector 8 includes a swing ring 26 rotatably supported within the slide ring 13 via a guide roller 25, and a
The structure is similar to that of a normal erector, including a D-plate 28 which is rotationally driven through a gear 27, and two segment gripping devices movable in the radial direction. In this erector 8, the frontmost segment 9a can be assembled 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 moved forward, and in this state, the erector 8 is located at the part where the frontmost segment 9a is assembled, so it performs excavation work in the same way as a conventional shield excavator as shown in FIG. The segments can be assembled simultaneously.

On the other hand, if the tail seal 10 is damaged while excavating a place with a lot of groundwater, the slide ring 13 is moved rearward by the slide jack 24 as shown in FIG.
The sealing member 16 is brought into pressure contact with the inner wall surface of the segment 1-0 already assembled in a ring shape. As a result, between the shield frame 1 and the segment 9, a ring girder 11 having a water stop packing 20, a ring bearing 14 having a seal ring 15, a slide ring 13 and a seal member 1 are provided.
6 from the inside, and can stop groundwater from entering through the damaged portion of the tail seal 10 from further infiltration. Therefore, the shield tunneling machine can be prevented from being submerged in water, and the safety of the worker and the protection of the working machine can be ensured.

Once the water has been stopped in this way, the chemical injection nozzle is protruded into the ground from the segment 9, etc., and a water stop agent is injected to stop the water underground, and then the tail seal 10 is repaired. By moving the slide ring 13 forward, the cutting and segment assembly operations can be resumed.

Note that the cross-sectional shapes of the shield frame 1 and the slide ring 13 are not limited to circular shapes, but may be rectangular or elliptical as shown in FIG. 7, for example. Further, the shield excavator may be of any type, such as a manual digging type or a muddy water pressurizing type.

Furthermore, the sealing member 16 may be installed in multiple stages. Also,
It is also possible to provide a strut or the like on the inner surface of the slide ring 13.

[Effects of the Invention] In summary, the present invention provides the following effects.

(1) Even if the tail seal is damaged, simply moving the slide ring to the segment side will seal the gap between the segment and the shield frame from the inside, which will prevent water damage during shield excavation and rescue. It can be prevented.

(2) Therefore, the safety of workers and the protection of working machines can be ensured.

(3) Since submergence can be prevented, underground geological improvement and tail seal repair can be carried out from inside the tunnel, allowing work to be resumed quickly.

[Brief Description of the Drawings] Figure 1 is a longitudinal sectional view showing one embodiment of the present invention, Figure 2 is a sectional view taken along the line Δ-A in Figure 1, and Figure 3 is an enlarged sectional view of part B in Figure 1. , FIG. 4 is a sectional view taken along the line C-C in FIG. FIG. 8 is a vertical cross-sectional view showing a conventional shield excavator. In the figure, 1 is a shield frame, 8 is an erector, 9 is a segment 1-113 is a slide ring, and 16 is a seal member. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney: Nobuo Kinutani Figure 7 Figure 8 Mi-bunwa 6 also? , N

Claims (1)

[Claims] In a device for water-stopping between a segment assembled by an erector in a rear part of a shield frame and a shield frame, a slide ring having a sealing member for sealing between the segments and the shield frame is provided in the shield frame so as to be reciprocally movable. , A water stop device for a shield excavator, characterized in that the above-mentioned erector etc. are provided in the slide ring.