JPH06207497A - Tail seal replacement device for shield excavating machine - Google Patents

Abstract

(57) [Summary] [Purpose] To allow easy and safe replacement of worn tail seals. A shield excavator provided with a tail seal 10 for sealing a gap between a segment 11 assembled along an inner wall of a tunnel and a skin plate 1a at a rear portion of a skin plate 1a of a shield body 1 for excavating in the ground, At the rear end of the skin plate 1a of the shield body 1,
The front tail ring 4 is slidable in the front-rear direction with respect to the skin plate 1a.
Connect the rear tail ring 5 to the rear end so that it can be separated and
A tail seal 10 is provided on the inner peripheral surface of the rear tail ring 5, and when the tail seal 10 is worn, a new tail seal 1 is formed on the inner peripheral surface of the front tail ring 4.
The tail seal 10 can be easily and safely replaced in the shield body 1 since the rear tail ring 5 is cut off by attaching 0a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail seal exchanging device for a shield machine, in which the tail seal can be easily exchanged.

[0002]

2. Description of the Related Art Conventionally, a shield machine for excavating a tunnel uses a segment assembled along the inner wall of the excavated tunnel as a reaction force to propel a shield body. Tail seals are provided in multiple stages to prevent dirt, muddy water, etc. from entering through the gaps between the segments. As shown in FIG. 1, the conventional tail seal is formed by a wire brush a whose base side is bent into a substantially V shape, and the tip end side is pressed against the outer peripheral surface of the segment b by the elasticity of the wire brush a. Grease or the like is injected into the wire brush a in order to improve water blocking performance.

On the other hand, when the above-mentioned conventional tail seal is used under high water pressure, it wears at a digging distance of about 2 to 2.5 km and the water blocking effect is significantly reduced. For this reason, conventionally, for example, Japanese Patent Application No. 1-30353 proposes a tail seal replacement device that can be replaced when the tail seal is worn.

[0004]

However, in the above-mentioned conventional tail seal exchanging device, the skin plate becomes thick because it has a three-layer structure in which the base plate of the tail seal is attached to the inside of the skin plate via the seal plate. As a result, the outer diameter of the shield body is unnecessarily increased, and the tail void (gap between the excavated tunnel inner wall and the segment outer peripheral surface) is increased accordingly. Also, with the conventional tail seal, since a new tail seal is set and then moved to the rear of the shield body for replacement, a part of the tail seal is lost due to the back ring of the tail seal, and the sealing effect decreases. There was also. The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a tail seal exchanging device for a shield machine, which can be easily and safely exchanged without damaging the tail seal. Is.

[0005]

In order to achieve the above object, the present invention provides a gap between a skin plate and a segment assembled along the inner wall of a tunnel in the rear part of the skin plate of a shield body which is dug underground. In a shield machine provided with a tail seal for sealing, a front tail ring is slidably attached to the skin plate rear end of the shield body in the front-rear direction with respect to the skin plate, and a rear end of the front tail ring. The rear tail ring is detachably connected and a tail seal is provided on the inner surface of the rear tail ring.If the tail seal wears, a new tail seal is attached to the inner surface of the front tail ring. The rear tail ring is separated.

[0006]

[Function] Even if the tail seal is worn by the above-mentioned structure, the front tail ring is slid rearward with respect to the shield main body, and a new tail seal is attached to the inner peripheral surface of the front tail ring. By separating,
The new tail seal allows you to continue digging while sealing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. 2 is a cross-sectional view of the tail seal device,
3 is an enlarged view of a circle P in FIG. 2, FIG. 4 is an enlarged view of a circle Q of FIG. 2, and FIGS. 5 to 8 are explanatory views of the operation when the tail seal is replaced.

In FIG. 2, 1 is a shield body, 2 is a skin plate of the shield body, and this skin plate 2
A small diameter portion 2b is formed on the outer peripheral surface of the rear portion except for the rear end portion 2a. Reference numeral 3 denotes a tail ring, which is formed of a front tail ring 4 and a rear tail ring 5 having an outer diameter substantially equal to the outer diameter of the skin plate 2. The front tail ring 4 is provided on the outer circumference of the small diameter portion 2b of the skin plate 2. It is fitted so that it can slide in the front-back direction.

As shown in FIG. 3, a stopper 4a is provided on the inner peripheral surface of the front tail ring 4 on the front end side, and the stopper 4a is formed on the rear end 2a of the skin plate 2 to form a step 2c. By engaging with, the front tail ring 4 is prevented from coming off from the small diameter portion 2b, and at the rear end of the front tail ring 4, as shown in FIG. Bolt holes 4b and 4c are formed over the entire length, and the bolt 6 inserted into the bolt hole 4b in the front row is
Thus, the front tail ring 4 and the rear end 2a of the skin plate 2 are detachably connected, and the bolt holes 4c in the rear row are connected.
A rear end of the front tail ring 4 and a rear end of the rear tail ring 5 are detachably connected by a bolt 7 inserted in the.

On the outer peripheral surface of the rear end portion 2a of the skin plate 2, a plurality of slide seals 8 are provided in the circumferential direction, and the slide plate 8 and the front tail ring 4 are provided by these slide seals 8. In addition to the sealing between the front tail ring 4 and the rear tail ring 5, a sliding seal 9 is also provided on the outer periphery of the front end portion of the rear tail ring 5. ing.

On the other hand, a tail seal 10 is attached to the inner peripheral surface on the rear end side of the rear tail ring 5 in a plurality of steps in the circumferential direction. Each of these tail seals 10 is formed of a wire brush whose base end side is bent in a substantially V shape, and grease is injected to enhance water blocking performance, and the tip end of the tail seal 10 is segmented by the elasticity of the wire brush.
Is pressed against the outer peripheral surface.

Next, the operation of the tail seal exchanging device configured as described above will be described. When the tail seal 10 is worn and the sealing effect is deteriorated during long-distance excavation, the bolt 6 connecting the rear end 2a of the skin plate 2 and the rear end of the front tail ring 4 is removed. In this state, the new segment 11a is temporarily assembled on the front side of the existing segment 11, and in this state, the spreader 12 of the shield jack (not shown) is brought into contact with the front portion of the new segment 11a to extend the shield jack. As a result, as shown in FIG. 5, the shield main body 1 advances by one pitch, the space between the skin plate 2 and the front tail ring 4 is extended by the unit length of the segment 11, and the stopper 4a is moved to the rear end of the skin plate 2. It is locked to the portion 2a.

Next, in this state, the shield jack is slightly contracted to separate the spreader 12 from the new segment 11a. Then, the temporarily assembled new segment 11a is removed, and the skin plate 2 is removed by the bolt 6 previously removed. The rear end 2a and the front end of the front tail ring 4 are connected to each other. In this state, as shown in FIG. 6, after a new tail seal 10a is fixed to the inner peripheral surface of the front tail ring 4 in a plurality of steps by means such as welding, the front tail ring 4 and the rear tail ring 4 are joined. The bolt 7 connecting between 5 is removed.

As described above, the new tail seal 10a is provided.
8 is completed, after the new segment 11a is fully assembled as shown in FIG. 7, the new segment 11a is used as a reaction force and the shield body 1 is propelled by the shield jack, so that it is worn as shown in FIG. The tail seal 10 is detached from the shield body 1, and a new tail seal 10a allows the front tail ring 4 and the segment 10a to be sealed thereafter.

[0015]

As described above in detail, according to the present invention, a front tail ring and a rear tail ring, which are detachably connected to each other, are provided at the rear end of the skin plate of the shield body, and are attached to the rear tail ring. If the tail seal wears, we installed a new tail seal on the front tail ring and separated the rear tail ring,
The worn tail seal can be replaced easily and safely.
This enables excavation over a long distance, and since it is not necessary to slide a new tail seal backwards to install it as in the past, part of the tail seal is damaged by the tail seal back ring and It is also possible to eliminate problems such as the effect decreasing early.

Further, since it is not necessary to increase the thickness of the skin plate of the shield body as in the conventional case, the tail void is not increased and the front tail ring is moved rearward with respect to the shield body when the tail seal is replaced. Due to the sliding structure, the tail ring does not become longer than necessary, which makes it possible to easily perform sharp curves.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a conventional tail seal.

FIG. 2 is a sectional view showing a tail seal exchanging device for a shield machine according to an embodiment of the present invention.

FIG. 3 is an enlarged view of a circle P in FIG.

FIG. 4 is an enlarged view within a circle Q in FIG.

FIG. 5 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

FIG. 6 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

FIG. 7 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

FIG. 8 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Shield body 1a Skin plate 4 Front tail ring 5 Rear tail ring 10 Tail seal 10a Tail seal 11 Segment

Claims (1)

[Claims] 1. A shield machine having a tail seal 10 for sealing a gap between a skin plate 1a and a segment 11 assembled along an inner wall of a tunnel at a rear portion of a skin plate 1a of a shield body 1 for excavating underground. At the rear end of the skin plate 1a of the shield body 1, a front tail ring 4 is slidable in the front-rear direction with respect to the skin plate 1a, and at the rear end of the front tail ring 4, a rear tail ring 5 is provided. The tail seal 1 is attached to the inner peripheral surface of the rear tail ring 5 by being detachably connected.
0, and when the tail seal 10 is worn, a new tail seal 10a is attached to the inner peripheral surface of the front tail ring 4 to separate the rear tail ring 5 from the tail seal of a shield machine. Exchange device.