JP3312791B2 - Method and apparatus for replacing tail seal of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for exchanging a tail seal of a shield machine, and more particularly, to a method and an apparatus for exchanging a tail seal of a shield machine in a machine. It is about.

[0002]

2. Description of the Related Art A tail frame formed behind a shield frame of a shield excavator seals a space between the tail frame and a segment disposed inside the tail frame to prevent earth and water from entering from behind. Tail seals are provided, and the tail seals are replaced during the excavation because the damage increases as the excavation distance increases.

[0003]

However, if the sediment water in the vicinity of the tail seal is frozen or injected into the sediment water in order to replace the tail seal, the construction period is delayed and the cost increases. is there.

In order to replace the tail seal, Japanese Patent Laid-Open Publication No. Hei 2-108795 proposes that a blocking bag is interposed between the tail seals disposed in front and rear of the digging direction to open the front tail seal into the machine. However, there is a disadvantage that the rear tail seal cannot be replaced because the front and rear tail seals are closed by the blocking bag. In addition, JP-A-2-
In Japanese Patent No. 225798, the tail seal can be replaced by moving the front and rear tail seals together in the excavation direction and opening them inside the machine. In this case, since the seal member is pushed out from the segment side to contact the tail frame extending rearward of the tail seal, the rear end of the tail frame is extended rearward by a predetermined length to secure the contact. There is a disadvantage that the length of the excavator becomes longer.

The present invention has been made to effectively solve the above problems.

The present invention provides a method and an apparatus for exchanging a tail seal of a shielded excavator, which can shorten the construction period and reduce the cost, and can replace the front and rear tail seals inside the excavator without extending the length of the excavator. The purpose is to provide.

[0007]

According to the present invention, there is provided a method for replacing a tail seal, wherein a water-stop filling material injection pipe for transferring the water-stop filling material backward in a digging direction is provided on an outer peripheral portion of the tail frame, and an inner periphery of the tail frame is provided. A tail seal mounting ring having a tail seal in contact with the segment is provided so as to be slidable back and forth in the digging direction, and the mounting ring is connected to the rear of the shield jack and pulled forward in the digging direction to pull the tail seal in the cabin ahead of the segment. When the mounting ring is advanced, a water-stopping filler is injected behind the tail seal, and a seal member that can expand and contract is interposed between the tail frame and the segment. After replacing the tail seal, detach the mounting ring from the shield jack and lock it to the segment disposed inward, After advancing the tail frame by extending the chromatography field jack, a spacer excavation forward to the rear inner peripheral surface of the tail frame by interposing is obtained so as to hold the mounting ring.

[0008] The tail seal replacement device of the present invention is provided on the outer peripheral portion of the tail frame to transfer the water-stopping filler material rearward in the excavation direction and to fill the rear end of the tail frame with an inwardly opened inlet. A tail seal that is slidably provided in the inner peripheral portion of the tail frame in the excavation direction back and forth, and has a tail seal in contact with the segment on the inner peripheral portion. A tail seal mounting ring that opens the injection port of the material injection pipe,
An inflatable and contractible seal member interposed between the tail frame and the segment when the mounting ring slides forward in the digging direction to replace the tail seal; and And a spacer for interposing the mounting ring on the rear inner peripheral surface of the tail frame.

[0009]

[Action] The tail seal replacement method adopts a double structure of a tail frame and a tail seal mounting ring that slides the inner periphery of the tail frame back and forth in the direction of excavation, and connects the tail seal mounting ring to the shield jack. By moving forward in the excavation direction, all the tail seals attached to the inside of the attachment ring are opened in the machine, so that the tail seals can be replaced. After replacement, if the mounting ring is separated from the shield jack and locked to the segment and the tail frame is advanced, the position of the mounting ring is fixed and relatively moves rearward, so a spacer is interposed in front of the excavation direction. By holding the mounting ring on the rear inner peripheral surface of the tail frame, it becomes possible to excavate. Further, when the tail seal mounting ring is advanced, a water blocking filler is injected to prevent intrusion of earth and sand water, and a seal member is interposed between the tail frame and the segment.

[0010] In the tail seal replacement device, the inlet of the water-stop filling material injection pipe is opened to the inside of the tail frame by the advancement of the mounting ring connected to the shield jack. The water-stopping filler can be injected only by advancing in the excavation direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 4, the shield machine 1 has an excavating cutter 2 at the front in the excavating direction and a cylindrical shield frame 3 at the rear of the cutter 2.
In the seal frame 3, a plurality of shield jacks 4 for moving the entire excavator forward are arranged at equal intervals in the circumferential direction. When the shield jack 4 extends, the shield jack 4 receives the excavation reaction force at the segment 5 disposed rearward and excavates the entire excavator. Further, tail seals 7 and 8 are attached to the inner peripheral portion of the tail frame 6 formed at the rear portion of the shield frame 3 before and after the excavation direction, and these tail seals 7 and 8 come into contact with the outer peripheral portion of the segment 5 from behind. Of the earth and sand water A is prevented.

In particular, in order to replace the tail seals 7 and 8 during the excavation, as shown in FIG. 1, a transfer passage for transferring the water-stop filling material B rearward in the excavation direction is provided on the outer peripheral portion of the tail frame 6. A water-blocking filler injection tube 12 to be formed is provided. The inlet 13 of the water-stop filling material injection pipe 12 is bent at the rear end of the tail frame 6 toward the inner peripheral side of the tail frame 6 so as to be opened.

A tail seal mounting ring 14 having tail seals 7 and 8 is provided on the inner peripheral portion of the tail frame 6 so as to be slidable back and forth in the digging direction, and a step for restricting the mounting ring 14 from sliding forward in the digging direction. Part 15
Are formed. The mounting ring 14 is connected to a segment engaging portion 17 formed at the rear end of the shield jack 4 via a connecting member 16 so as to slide forward in the digging direction. The injection port 13 of the water-stop filling material injection pipe 12 closed by 14 is opened.

As shown in FIG. 1, when the tail seals 7 and 8 are replaced, a replacement segment 5a is provided inside the tail frame 6, and the replacement segment 5a has an inflatable and contractible seal member 18. Is housed. The seal member 18 is held in the groove 19 which is open to the replacement segment 5a in a U-shaped cross section facing the tail frame 6 side, and when the mounting ring 14 slides forward in the digging direction, the seal member 18 is closed. The space between the tail frame 6 and the replacement segment 5a is sealed by expansion by the sealing fluid C supplied from the inside.

The mounting ring 14 is provided with a tail seal 7,
After the replacement of the tail frame 8, the tail frame 6 is held on the rear inner peripheral surface of the tail frame 6 by interposing the spacer 21 between the step portion 15 and the step portion 15 in the forward direction.

Next, a method of replacing the tail seals 7, 8 will be described.

As shown in FIGS. 1 and 4, in order to replace the tail seals 7, 8 attached to the inside of the tail frame 6, first, a replacement segment 5a is provided and the spacer 21 is removed. Then, the distal end of the mounting ring 14 is connected to the segment engaging portion 17 formed on the elongated shield jack 4 via the connecting member 16. Since the attachment ring 14 is connected, if the shield jack 4 is shortened and retracted, the attachment ring 14 is also retracted forward in the digging direction as shown in FIG. Since the tail seals 7 and 8 attached to the mounting ring 14 are opened to the inside 22 of the machine in front of the replacement segment 5a, both the front and rear tail seals 7 and 8 are new tail seals 7a and 8a ( (Shown in FIG. 3). Since the interior 22 is replaced, the used tail seals 7, 8 can be easily removed and new tail seals 7a, 8a can be easily attached.

As shown in FIG. 2, when the mounting ring 14 is moved forward, the water-blocking filler injection pipe 12 is disposed on the outer periphery of the tail frame 6 to prevent the intrusion of the sediment water A.
The inlet 13 is opened by the forward movement of the mounting ring 14, and the water-stopping filler B is injected from the inlet 13. Further, the mounting ring 14 moves forward and the rear tail seal 8
When the sealing fluid C is supplied into the sealing member 18 from the inside of the replacement segment 5a when passing over the sealing member 18, the sealing member 18 expands between the replacement segment 5a and the tail frame 6 and And the space between the seal member 18 and the tail frame 6 is securely sealed with the water-stopping filler B. Immediately after the front tail seal 7 passes over the seal member 18, the seal member 18 is expanded radially outward in advance so as to allow the rear tail seal 8 to pass over the seal member 18 to increase the diameter. By doing so, it is possible to prevent the water blocking filler B from flowing into the rear tail seal 8 beyond the sealing member 18 as much as possible.

After replacement with the new tail seals 7a, 8a, the connection between the shield jack 4 and the mounting ring 14 is disconnected, and as shown in FIG.
The segment 5b is disposed inside the inner surface 8a, and a stopper 23 for engaging the base of the front tail seal 7 to restrict the advancement of the mounting ring 14 is attached to the tip of the segment 5b. If the shield jack 4 is extended while the attachment ring 14 is locked to the segment 5b in this manner, the tail frame 6 moves forward while the position of the attachment ring 14 is fixed. Step 1
5 can be moved relatively. Next, after removing the stopper 23, as shown in FIG.
When the connecting ring 14 is fixedly connected to the step portion 15 formed in the inner peripheral portion of the tail frame 6 in the excavation direction, the mounting ring 14 is held on the rear inner peripheral surface of the tail frame 6 and becomes excavable, and the length of the excavator 1 is extended. I won't let you. In addition, the injection port 13 of the water-stop filling material injection pipe 12 is automatically closed at the rear end of the tail frame 6.

As described above, in the present invention, the mounting ring 14 having the tail seals 7 and 8 is slid along the tail frame 6 to open the tail seals 7 and 8 into the in-machine 22 in front of the segment. In addition, the front and rear tail seals 7, 8 can be exchanged, and the length of the excavator is not extended.

Further, in order to open the injection port 13 of the filler injection pipe 12 to the inner peripheral portion of the tail frame 6, simply by moving the attachment ring 14, the injection port 13 of the water-stopping filler injection pipe 12 is opened. It is not necessary to separately provide a means for opening the water-stop filling material injection pipe 12, and simplification can be achieved.

[0023]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) In the first aspect, the tail seal mounting ring is slid along the tail frame to open the tail seal into the machine in front of the segment, so that the construction period is short, and the tail seal can be replaced with the front and rear tail seals.

(2) In the second aspect, the filler inlet is opened to the inner peripheral portion of the tail frame, so that the tail seal mounting ring is advanced only to open the filler filler inlet. In addition, it is not necessary to separately provide a means for opening the water-stop filling material injection pipe, and simplification can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state immediately before replacement of a tail seal.

FIG. 2 is a cross-sectional view showing a state where a tail seal is opened in the machine.

FIG. 3 is a sectional view showing a state after a tail seal is replaced.

FIG. 4 is a cross-sectional view showing the entire shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 Shield jack 5, 5a, 5b Segment 6 Tail frame 7, 8 Tail seal 7a, 8b Tail seal after exchange 12 Water-stop filling material injection pipe 13 Injection B Water-stop filling material 14 Tail seal mounting ring 18 Seal member 21 Spacer 22 Inflight

Continuation of the front page (72) Inventor Takashi Rannichi 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Maju Heavy Industries Co., Ltd. Aichi Factory (56) References JP-A-2-108795 (JP, A) JP-A-2 -225798 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 11/00

Claims (2)

(57) [Claims] 1. A tail seal mounting means for disposing a water-blocking filler injection pipe for transferring the water-blocking filler material rearward in a digging direction on an outer peripheral portion of a tail frame and having a tail seal in contact with a segment on an inner peripheral portion of the tail frame. A ring is provided slidably back and forth in the digging direction, and the mounting ring is connected to the rear of the shield jack and pulled forward in the digging direction to open the tail seal in the machine in front of the segment. The tail seal opened in the machine is replaced after the tail seal opened in the machine is inserted by injecting a water-stopping filler into the rear of the tail seal and interposing an inflatable and contractible seal member between the tail frame and the segment. From the front, the shield jack is extended, and the tail frame is advanced by extending the shield jack. A method of exchanging a tail seal of a shield machine, wherein a spacer is interposed on a rear inner peripheral surface of a tail frame in a forward direction in the excavation direction to hold the mounting ring. 2. A water-blocking filler injection pipe disposed on an outer peripheral portion of the tail frame for transferring the water-blocking filler material rearward in the direction of excavation and having an inlet port opened inward at a rear portion of the tail frame. The tail frame has a tail seal slidably provided in the inner periphery of the tail frame back and forth in the excavation direction and has a tail seal in contact with the segment in the inner periphery, and opens the inlet of the water-stop filling material injection pipe when slid forward in the excavation direction. A tail seal mounting ring, an inflatable and contractible seal member interposed between the tail frame and the segment when the mounting ring slides forward in the digging direction to replace the tail seal, and A spacer provided in front of the mounting ring in a direction in which the mounting ring is digged, and a spacer for holding the mounting ring on a rear inner peripheral surface of the tail frame. Excavator tail seal replacement device.