JP3242235B2 - Tail seal replacement method and device - 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 replacing a tail seal, and more particularly to a method and an apparatus for replacing a tail seal of a shield machine in a machine.

[0002]

2. Description of the Related Art A tail frame formed behind a shield frame of a shield machine is provided with a tail seal for sealing between the tail frame and a segment disposed inside the tail frame. The tail seal is replaced during the excavation because the damage progresses 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 to the rear of the tail seal, the rear end of the tail frame is positioned rearward of the rear tail seal in order to secure the contact. The length must be extended,
There is a disadvantage that the length of the excavator becomes longer.

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

An object of the present invention is to provide a tail seal replacement method and a tail seal replacement method capable of shortening the construction period and reducing the cost and exchanging the front and rear tail seals inside the excavator without extending the length of the excavator. Aim.

[0007]

According to the method of replacing a tail seal of the present invention, an outer cylinder ring is slidably superimposed on the outer peripheral portion of a tail frame having a tail seal in contact with a segment so as to cover the outer periphery of the tail frame. A water-blocking filler injection pipe for transferring the water-blocking filler to the outer cylinder ring in the digging direction is disposed, and the tail frame is advanced in the digging direction while the position of the outer cylinder ring is fixed to the rear. While opening the tail seal in the tail frame inside the machine ahead of the segment, when the tail frame is advanced, water-stop filling material is injected behind the tail seal, and
A seal member capable of expansion and contraction is interposed between the outer cylinder ring and a segment inside the outer cylinder ring, and after replacing the tail seal opened in the machine, excavating the outer cylinder ring while fixing the position of the tail frame. It is designed to draw in the direction.

[0008] Further, the tail seal replacement device of the present invention has an outer cylinder ring superimposed on an outer peripheral portion of a tail frame having a tail seal in contact with a segment so as to cover the outer periphery thereof, and a water stoppage disposed on the outer cylinder ring. A water-blocking filler injection pipe having an injection port opened toward the inside of the outer cylinder ring while transferring the filler material in the excavation direction, and the outer cylinder ring in the excavation direction front and rear with the tail frame as a fixed side. A slide jack that slides to open and close the injection port of the water blocking filler injection pipe, and an outer cylinder behind the tail seal when the tail seal is advanced while fixing the position of the outer cylinder ring to the rear through the jack. An inflatable and contractible sealing member for sealing between the ring and the segment inside the ring.

[0009]

[Function] As described above, the dual structure of the tail frame and the outer cylinder ring which is slidably overlapped so as to cover the tail frame is adopted, and the tail frame is moved in the excavation direction while fixing the position of the outer cylinder ring to the rear. When advanced, all the tail seals attached to the inside of the tail frame are opened inside the machine, and the tail seals can be replaced. After replacement, if the outer cylinder ring is pulled in the direction of excavation, the captain at the time of excavation returns. Further, when the tail frame is advanced, the water blocking filler is injected from the outer cylinder ring, and a sealing member is interposed between the outer cylinder ring and the segment.

[0010] The injection port of the water-stop filling material injection pipe is opened inside the outer cylinder ring, and the injection port is opened and closed only by sliding the outer cylinder ring with the tail frame as a fixed side.

[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.

Particularly, in order to replace the tail seals 7 and 8 during the excavation, an outer cylindrical ring 11 is provided on the outer peripheral portion of the tail frame 6 so as to cover the tail frame 6 so as to be slidable in the excavation direction. As shown in FIG. 1, a water-blocking filler injection pipe 12 that forms a transfer passage for transferring the water-blocking filler B backward in the excavation direction is formed in the outer cylindrical ring 11.
Is arranged. Injection port 13 of this water-stop filling material injection pipe 12
The rear end of the outer cylinder ring 11 is bent and opened at the rear end of the outer cylinder ring 11, and the inlet 13 is closed at the rear end of the tail frame 6 during excavation.

In order to slide the outer cylinder ring 11,
As shown in FIG. 4, the shield frame 3 is formed with a groove 15 for accommodating a slide jack 14 which is extendable and contractible in the excavating direction. The slide jack 14 is alternately arranged with the shield jack 4 in the circumferential direction. The cylinder side of the slide jack 14 is connected to the rear part in the groove 15 via a bracket 16, and the rod side of the slide jack 14 is connected to the inner peripheral surface of the outer cylinder ring 11 via a bracket 17. Guide rollers 18 and 19 are interposed between the shield frame 3 and the outer cylinder ring 11 in order to smoothly slide the outer cylinder ring 11 in the digging direction.

Accordingly, if the slide jack 14 is extended, the outer cylinder ring 11 can be slid forward in the digging direction with the tail frame 6 as the fixed side. The ring 11 is configured to slide rearward in the digging direction with the tail frame 6 fixed. In this case, when the shield jack 4 is extended in synchronization with the shortening of the slide jack 14, the tail frame 6 can be advanced while the position of the outer cylinder ring 11 is fixed. That is, the entire excavator moves forward with the outer cylinder ring 11 left behind. As shown in FIG. 1, when the tail frame 6 advances, the injection port 13 of the water blocking filler injection pipe 12 opened inside the outer cylinder ring 11 is opened.

As shown in FIG. 1, when replacing the tail seals 7, 8, a replacement segment 5a is provided inside the tail frame 6, and the replacement segment 5a is provided with an inflatable and contractible seal member 21. Is housed. This seal member 21 is attached to the replacement ring 5
The seal supplied from the inside of the segment 5a when the tail frame 6 moves forward while holding the position of the outer cylinder ring 11 while being held in the groove 22 opened to have a U-shaped cross section facing the first side. The space between the tail frame 6 and the outer cylinder ring 11 is sealed by being expanded by the working fluid C.

Next, a method of replacing the tail seal 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.
After the replacement segment 5a is provided, the shield jack 4 is extended and the slide jack 14 is shortened at the same time by receiving a reaction force from the replacement segment 5a. While moving backward, the tail frame 6 moves forward in the digging direction with the replacement segment 5a as a fixed side, so that both move relatively in opposite directions, and the position of the outer cylinder ring 11 is held fixed. It is in the state as it was. Accordingly, the entire excavator including the tail frame 6 moves forward with the outer cylinder ring 11 left behind.

When the tail frame 6 moves forward, as shown in FIG. 2, in order to prevent the intrusion of the sediment water A, the injection port 13 of the water-stop filling material injection pipe 12 provided on the outer cylinder ring 11 is provided. The tail frame 6 is opened by the forward movement, and the water-stopping filler B is discharged from the inlet 13. further,
When the tail frame 6 moves forward and the rear tail seal 8 passes over the seal member 21, the replacement segment 5a
When the sealing fluid C is supplied into the seal member 21 from the inside of the seal member 21, the seal member 21 expands between the replacement segment 5a and the outer cylinder ring 11 to seal the space therebetween. The seal with the ring 11 is securely sealed with the water-stopping filler C. The front tail seal 7
Immediately after the seal member 21 has passed over the seal member 21, the seal member 21 is expanded radially outward in advance so as to allow the rear tail seal 8 to pass over the seal member 21, and the water is stopped. It is possible to prevent the filler B from flowing into the rear tail seal 8 side beyond the seal member 21 as much as possible.

As described above, when the tail frame 6 is moved forward while the outer cylinder ring 11 is left behind, the front and rear tail seals 7 and 8 attached to the inside of the tail frame 6.
Move to the front of the replacement segment 5a and
, Both tail seals 7 and 8 are installed in the cabin 2
3 can be replaced. Since the in-machine 23 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. 3, a new tail seal 7 is provided.
After exchanging the rods a and 8a, if the segments 5c are arranged inside and the slide jacks 14 are extended, the outer cylinder ring 11 is drawn in the excavation direction with the tail frame 6 as the fixed side. When the outer cylinder ring 11 is retracted, the injection port 13 of the water-stopping filler injection pipe 12 is closed at the rear end of the tail frame 6 and becomes the original machine length, and is ready for excavation.

As described above, according to the present invention, the outer cylinder ring 11 is superimposed so as to cover the outer peripheral portion of the tail frame 6.
Is fixed to the rear, and the tail frame 6 is advanced to open the tail seals 7, 8 to the cabin 23 in front of the segment, so that the construction period is short, and the front and rear tail seals 7, 8 can be replaced. After the replacement of the tail seals 7, 8, the outer cylinder ring 11 is pulled in the excavation direction, so that the captain of the excavator can be returned to the original state at the time of excavation.

Further, the inlet 13 of the water-stop filling material injection pipe 12
Is opened inside the outer cylinder ring 11 and the tail frame 6
By simply sliding the outer ring 11 with the fixed side as the fixed side, the inlet 13 of the water-stopping filler injection pipe 12 is opened and closed, and it is unnecessary to separately provide a means for opening and closing the water-stopping filler injection pipe 12, Simplification can be achieved.

[0024]

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

(1) In the first aspect, the tail frame is advanced while the position of the outer cylinder ring overlapped so as to cover the outer peripheral portion of the tail frame is fixed, and the tail seal is opened inside the machine in front of the segment. The construction period is short, and the front and rear tail seals can be replaced.

(2) In the second aspect, the injection port of the water-stop filling material injection pipe is opened to the inside of the outer cylinder ring, and the water-stop filling material injection pipe is formed simply by sliding the outer cylinder ring with the tail frame as a fixed side. Is opened and closed, it is not necessary to separately provide a means for opening and closing the water-stopping filler 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 sectional view showing a state in which a tail seal is opened inside the machine and replaced.

FIG. 3 is a cross-sectional view showing a state where an outer cylinder ring is retracted after a tail seal is replaced.

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

[Explanation of symbols]

 5, 5a, 5b Segment 6 Tail frame 7, 8 Tail seal 7a, 8b Tail seal after replacement 11 Outer cylinder ring 12 Water-stop filling material injection pipe B Water-stop filling material 21 Seal member 23 Inside machine

Continuation of the front page (72) Inventor Takashi Ranage 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Maju Industry Co., Ltd. Aichi Factory (56) References JP-A-3-244793 (JP, A) JP-A-2 -108795 (JP, A) JP-A-2-225798 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/00

Claims (2)

(57) [Claims] 1. An outer cylinder ring is slidably laid back and forth in the direction of excavation so as to cover an outer peripheral portion of a tail frame having a tail seal in contact with a segment, and the outer cylinder ring is filled with water stopping rearward in the direction of excavation. A water-blocking filler injection pipe for transferring the material is provided, and the tail frame is advanced in the excavation direction while fixing the position of the outer cylinder ring to the rear, and the tail seal in the tail frame is placed in the machine in front of the segment. Along with opening the tail frame, when the tail frame is advanced, a water blocking filler is injected behind the tail seal, and an inflatable and contractible seal member is interposed between the outer cylinder ring and the inner segment thereof, After replacing the tail seal opened inside the machine, the outer cylinder ring is drawn in the excavation direction while fixing the position of the tail frame. How to replace the seal. 2. An outer cylinder ring superimposed on an outer peripheral portion of a tail frame having a tail seal in contact with a segment so as to cover the outer peripheral portion, and a water-stopping filler disposed on the outer cylinder ring is transported rearward in the digging direction. And a water-blocking filler injection pipe having an injection port opened toward the inside of the outer cylinder ring,
With the tail frame as the fixed side, slide the outer cylinder ring back and forth in the excavation direction to open and close the injection port of the water-stop filling material injection pipe, and fix the position of the outer cylinder ring to the rear through the jack. And a seal member capable of inflating and contracting to seal between an outer cylinder ring behind the tail seal and an inner segment when the tail seal is advanced while moving the tail seal.