JP3228686B2 - Emergency waterproofing device for shield machine tail seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency waterproofing device for a shield tail seal, which inspects and replaces a plurality of tail seals provided inside an outer cylinder of the shield machine during excavation.

[0002]

2. Description of the Related Art Conventionally, when exchanging a tail seal during excavation with a shield machine, the ground of the surrounding ground is improved by a method such as chemical injection or the like, or water is drained from the ground by an intermediate stand. Techniques are known for removing the segments from the machine and replacing the tail seal after a complete shut-off.

[0003]

However, as the shield excavation becomes very long, the tail seal suffers from wear and damage due to the backing material, and the original water blocking function is deteriorated. Exchange is inevitable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an emergency water barrier for a tail seal of a shield machine capable of preventing water leakage only in the shield machine and replacing the tail seal without using an auxiliary construction method such as ground improvement. .

[0005]

According to the present invention, there is provided an emergency waterproofing device for a shield machine tail seal for inspecting and replacing a plurality of tail seals provided inside an outer cylinder of the shield machine during excavation. An arc-shaped tail seal brush attachment member having the same radius as the steel segment is fixed to the front end of the segment, and is formed of urethane foam having an arc-shaped protection plate formed of spring steel inside and outside the attachment member. A tail seal brush is attached, the protection plate has an outer side that is shorter, and a water-impervious segment having a smaller diameter than the steel segment is provided at the end of the steel segment. There is provided an extrusion means for pushing outward in the direction, and an inlet for injecting tail seal grease in front of the tip of the tail seal brush. To have.

Further, according to the present invention, in the emergency water-blocking device for a shield machine tail seal for inspecting and replacing a plurality of tail seals provided inside the shield machine outer cylinder during excavation, the steel segment has a tail seal. A mounting member for attaching the brush is fixed, and a tail seal brush formed of urethane foam having an arc-shaped protection plate formed of spring steel on the inside and outside of the mounting member is attached, and the protection plate is shortened on the outside. A mounting bar and a reaction force receiving material segment are attached to the mounting member, and a sliding outer plate is slidably provided outside the mounting member and the supporting bar, and the outer plate has a circle having the same radius as the segment. It is formed in an arc shape, and a grease inlet is attached to the attachment member.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which an emergency water blocking device is attached, and a first-stage tail seal 2 is provided inside a shield machine outer cylinder 1 by a caulking member 2a.
The second-stage tail seal 3 is attached to the caulking member 3a, and the third-stage tail seal 4 is attached to the caulking member 4a.

An attachment member 8 to which a tail seal brush 10 is attached is welded to the tip of the steel segment 5, and the tail seal brush 10 is attached to the inside of the attachment member 8 with bolts 9.

The tail seal brush 10 is formed of urethane foam, and has an inner protection plate 11 (t = about 2 mm) and an outer protection plate 12 (t = about 0.5 mm).
The outer protection plate 12 is formed shorter than the inner protection plate 11 and is configured to directly contact a location where the urethane foam seals.

Further, between the steel segments 5 and 6, a water-blocking segment 7 whose outer diameter is smaller than the steel segment 5 by the thickness of the tip of the tail seal brush 10 is attached by bolts 20 and 21. Water segment 7
, An extruding bolt 13 as an extruding means for extruding the tail seal brush 10 radially outward is screwed to a nut 13a welded to the inside of the segment 7. Further, a grease inlet 14 is provided adjacent to the tip of the seal 10.

The operation will be described below.

When inspecting and replacing the first-stage tail seal 2 and the second-stage tail seal 3, first, the tail seal brush 10 is attached to the attachment member 8 of the steel segment 5 in a circumferential shape. At this time, the push bolt is kept in a retracted state. Next, the impermeable segment 7 is assembled between the steel segments 5 and 6. Then, the water shielding segment 7 is pushed out by the shield jack to a predetermined position where the pushing bolt 13 becomes close to the caulked portion of the third stage tail seal 4.

Next, the push-in bolt 13 is screwed in to push the inner protective plate 11 outward in the radial direction, and the outer protective plate 12 is thinned, so that the inner protective plate 11 bends and bends, and a tail seal brush is provided inside the outer cylinder 1. 10 is abutted (position A) to fill the clearance.

Since water leakage can be prevented by this, the steel segment 6 is disassembled and the first and second tail seals 2 and 3 are disassembled.
After the inspection and replacement, the concrete segment 6 is assembled, the push bolt 13 is loosened, grease is injected from the grease injection port 14, and normal excavation is started.

At this time, even if the tail seal brush 10 does not return for some reason, the third stage tail seal 4 does not get caught when pushing out the segment.

FIG. 2 shows a second embodiment of the present invention. A reaction force receiving segment 19 abuts on a spreader 25 of the shield machine, and a load bearing bar 18 is provided on the reaction force receiving segment 19. The mounting member 27 for mounting the same tail seal brush 10 as in the first embodiment is mounted between the load-bearing bar 18 and the existing concrete segment 23 via the welded side plates 27a and 27b. I have.

A sliding outer plate 17 formed in an arc shape having the same radius as the outer diameter of the segment 23 is provided with a load bearing bar 18.
Are slidably provided between the side plate 18a of the mounting member 27 and the side plate 27a of the mounting member 27.

Hereinafter, the operation will be described.

The shield type jack (not shown) pushes the slide type outer plate 17 to a predetermined position (position shown), and the slide type outer plate 17 is pulled out to a position shown in FIG. Tail seal brush 1 held down by outer plate 17
0 rises to the position B due to the reaction force of the inner protection plate 11 and stops water. Grease is filled from the grease inlet 14 to the position indicated by C in order to enhance the water stopping effect.

In this state, the bearing bar 18 is removed,
Inspect and replace the first and second tail seals 2 and 3, attach the load bearing bar 18, open the grease injection port, slide the outer plate 17 to the original position, and change the tail seal brush 10 to its original shape. return.

Even if the tail seal brush 10 does not return to its original shape, normal excavation can be resumed because the seal tail brush 10 is resistant to backing.

[0023]

The present invention is configured as described above,
When replacing the tail seal during excavation with a shield machine,
Attach a tail seal brush made of urethane foam with a steel protection plate inside and outside to the segment inside the shield machine, contact the seal with the inside of the outer cylinder of the shield machine to prevent water leakage, and replace the tail seal safely You can do it. Therefore, it can be replaced inside the shield machine without using auxiliary construction methods such as ground improvement around.

[Brief description of the drawings]

FIG. 1 is a side view of a tail seal replacement device according to a first embodiment of the present invention.

FIG. 2 is a side view of a tail seal replacement device according to a second embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... The outer cylinder of a shield machine 2 ... 1st stage tail seal 3 2nd stage tail seal 4 3rd stage tail seal 5 ... Steel segment 7 ... Waterproof segment 8, 27: Tail seal brush mounting member 10: Tail seal brush 11: Inner protection plate 12: Outer protection plate 13: Push bolt 14: Grease injection port 18: Strength Bar 19: Reaction force receiving segment

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Imakawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. No. Kashima Construction Co., Ltd.Technical Research Laboratory (72) Inventor Fumio Imadate Kashima Construction Co., Ltd. 2-9-1-1 Tobita-Shi, Kabuto, Tokyo 1-2-7, Akasaka Kashima Construction Co., Ltd. (56) References JP-A-2-225798 (JP, A) JP-A-2-157397 (JP, A) JP-A-7-102889 (JP, A) JP-A-3-244793 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/00

Claims (2)

(57) [Claims] 1. An emergency water-blocking device for a tail seal of a shield machine for inspecting and replacing a plurality of tail seals provided inside an outer cylinder of the shield machine during excavation, the same radius as the steel segment at the front end of the steel segment. A tail seal brush formed of urethane foam having an arc-shaped protection plate formed of spring steel inside and outside is fixed to the mounting member of the arc-shaped tail seal brush. An outer side of the plate is shortened, and a water-impervious segment having a smaller diameter than the steel segment is provided at the end of the steel segment. A shield provided with an injection port for injecting tail seal grease in front of the tip of the brush Emergency water barrier for machine tail seal. 2. A mounting device for attaching a tail seal brush to a steel segment in an emergency water shielding device for a shield machine tail seal for inspecting and replacing a plurality of stages of tail seals provided inside an outer cylinder of the shield machine during excavation. A tail seal brush formed of urethane foam having an arc-shaped protection plate formed of spring steel inside and outside is attached to the outside of the attachment member, and the outside of the protection plate is shortened. A load-bearing bar and a reaction-force receiving material segment are attached to the mounting member, and a sliding outer plate is slidably provided outside the mounting member and the load-bearing bar. An emergency water blocking device for a tail seal of a shield machine, wherein a grease injection port is mounted on the mounting member.