JPH06280485A - Device for exchanging tail seal shield excavator - Google Patents

Abstract

PURPOSE:To make it possible to exchange a worn out tail seal safely and efficiently. CONSTITUTION:In a shield excavator having a tail seal 5 slidingly connected to the peripheral surface of a segment 7 assembled along the internal wall of a tunnel to the rear of a shield main body excavating the ground and preventing the incursion of earth, the front tail ring 3 is provided to the rear of the shield main body 1, and the rear tail ring 4 capable of sliding in the vertical direction is provided to the inside of the front tail ring 3 to mount a spacer 8 and a tail seal 5a to the circumferential surface of the front tail ring 3 in a detachable manner. A tail seal 5b is fixed to the circumferential surface of the rear tail ring 4. When the tail seals 5 and 5b are worn away, the tail seal 5b of the rear tail ring 4 side is fixed to the segment 7 with a hardener 9, and the front tail ring 3 is separated from the rear tail ring 4. The spacer 8 and rail seal 5a of the front tail ring 3 side are removed, and a new tail seal 5c is mounted to the circumferential surface of the front tail ring 3. According to the constitution, the tail seal 5 can be safely and efficiently exchanged without requiring any auxiliary method.

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 above-mentioned conventional tail seal is formed by a wire brush a whose base side is bent in a substantially V shape and protective plates c and d, and the tip side is segmented by elasticity of the protective plates c and d. It is adapted to be pressed against the outer peripheral surface of b, and 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, the tail seal is worn at a digging distance of about 2 to 2.5 km and the water blocking effect is significantly reduced. Therefore, conventionally, a tail seal exchanging device which can be exchanged when the tail seal is worn has been proposed in, for example, Japanese Patent Laid-Open No. 210110/1990.

[0005]

However, in the above-mentioned conventional tail seal exchanging device, since the tail seal is exchanged while sliding the tail seal set rearward, a lot of man-hours are required for exchanging the tail seal, resulting in high work efficiency. At the same time, there was a problem that the tail seal was intentionally buckled, so that the tail seal was damaged and the sealing function deteriorated. 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 replacement device for a shield machine which is easy to replace and does not damage the tail seal. .

[0006]

In order to achieve the above-mentioned object, the present invention provides a shield main body which is dug in the ground, at the rear portion thereof.
In a shield machine equipped with a tail seal that prevents the ingress of soil and sand by sliding contact with the outer peripheral surface of the segment assembled along the inner wall of the tunnel, a front tail ring is provided at the rear of the shield main body. A rear tail ring that can slide in the front-rear direction is provided inside the rear tail ring, and a spacer and a tail seal are detachably attached to the inner peripheral surface of the front tail ring. When the tail seal is fixed and the tail seal wears, fix the tail seal on the rear tail ring side to the segment with a solidifying material, separate the front and rear tail rings, and remove the spacer and tail seal on the front tail ring side. Then, a new tail seal is attached to the inner peripheral surface of the front tail ring.

[0007]

With the above construction, since the existing tail seal can be replaced with a new tail seal while water is stopped, the tail seal can be replaced safely and efficiently without the need for an auxiliary construction method such as chemical injection.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. Figure 2 shows the vicinity of the tail seal provided at the rear of the shield body.
Is a shield body, 2 is a shield jack, 3 is a front tail ring, 4 is a rear tail ring, 5 is a tail seal,
7 indicates a segment.

The front tail ring 3 is a shield body 1
The rear end side is connected to the rear end, and the rear end side is made thin by recessing the inner peripheral surface in the circumferential direction, and the rear tail ring 4 is connected to approximately the middle part inside the thin part. The connecting portion 3a is formed so as to project in a ring shape in the circumferential direction, and a large number of screw holes 3b are formed in the connecting portion 3a at intervals in the circumferential direction.

The rear tail ring 4 has a front end fixed with a mounting ring 4a which slides in the front-rear direction along the inner surface of the thin portion of the front tail ring 3, and a bolt hole formed in the mounting ring 4a. The mounting bolt 6 inserted from the inside into the front tail ring 3 is screwed into the screw hole 3b of the connecting portion 3a of the front tail ring 3 described above.
On the other hand, the rear tail ring 4 is detachably connected. The tail seal 5b is provided on the inner peripheral surface of the rear tail ring 4 in a plurality of steps, for example, two steps, in the circumferential direction.
However, a tail seal 5a is detachably attached to the inner peripheral surface of the thin portion on the front side of the connecting portion 3a of the front tail ring 3 via a spacer 8. These tail seals 5
Each of a and 5b is formed of a wire brush and a protection plate whose base end portion is bent in a substantially V shape, and the tip end side thereof is pressed against the outer peripheral surface of the segment 7 by the elasticity of the protection plate.

The operation will be described next. When the tail seal 5 is worn during the long-distance excavation by the shield body 1 and the sealing effect is lowered, first, as shown in FIG. Face and rear tail ring 4
The solidifying material 9 is injected into the inner peripheral surface of the above to fix the tail seal 5a to the outer peripheral surface of the existing segment 7a, and at the same time, water and earth and sand are prevented from entering the tunnel. Next, in this state, while removing the frontmost segment 7b one by one, the mounting bolts 6 connecting the front tail ring 3 and the rear tail ring 4 are removed, and the removed segment 7b is reassembled to the front side. The segment 7c is newly assembled as shown in FIG. And in this state segment 7c
As a reaction force, the shield jack 2 advances the shield body 1 by one pitch as shown in FIG.

Next, after the segments 7c and 7b are sequentially removed, the spacer 8 and the tail seal 5a are removed, and in this state, a new tail seal 5c is formed on the inner peripheral surface of the thin portion of the front tail seal 3 as shown in FIG. After being attached in plural stages by means such as welding, the segments 7b and 7c removed in the previous step are assembled, and before that, a new segment 7d is assembled as shown in FIG. And this segment 7d
When the shield main body 1 is propelled by the shield jack 2 while receiving the reaction force, the worn tail seal 5
The rear tail ring 4 and the front tail ring 5 to which the b is attached can be separated from each other, and a new tail seal 5c can be used to perform a seal between the front tail ring 3 and the segment 7.

7 to 11 show the tail seal 10
Another embodiment in which the seal function is restored by adding one stage to the above will be described below. That is, the tail seal 10 at the frontmost stage is previously attached to the shield body 1 via the spacer 11, and the shield jack 2 is also shown in FIG.
As shown in, the collar 1 is approximately equal to the length of the spacer 11.
It is attached to the shield body 1 via 2. When adding the tail seal 10, first, the shield body 1 is moved forward by the shield jack 2, and then the spacer 11 is removed as shown in FIG. As shown in FIG. 11, it is directly attached to the shield body 1.

Next, after the spacer 11 is removed, a new tail seal 10a is attached as shown in FIG. 9 so that the tail seal 10 is added. By adding the tail seal 10a, the existing tail seal 10 is stopped. Even if the water function deteriorates, the water-stopping effect does not deteriorate and long-distance excavation can be continued. By attaching the tail seal 10b at the rearmost portion to the rear end of the skin plate 1a, the backfill material e is attached between the skin plate d and the tail seal c like the conventional tail seal c shown in FIG. Since the tail seal c does not become defective, the durability of the tail seal 10 is improved.

[0015]

As described above in detail, according to the present invention, when the worn tail seal is replaced, the solidifying material is injected between the rear tail ring and the segment. Since it is possible to prevent soil and sand from entering the tunnel, the tail seal can be replaced without injecting a chemical agent or using an auxiliary construction method such as pressure air or freezing. In addition, since it is not necessary to send the tail seals one by one and replace them, it is possible to efficiently replace the tail seals in a short time, and since it is not necessary to intentionally buckle the tail seals, there is no fear of damaging the tail seals.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing the vicinity of a tail seal of the shield machine according to the embodiment of the present invention.

FIG. 3 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

FIG. 4 is an operation explanatory view of the tail seal exchanging device according to the embodiment of the present invention.

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 a sectional view showing a tail seal device according to another embodiment of the present invention.

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

FIG. 9 is an operation explanatory view of a tail seal device according to another embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a shield jack portion of a shield machine that employs a tail seal device according to another embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a shield jack portion of a shield machine that employs a tail seal device according to another embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a defect of a conventional tail seal.

[Explanation of symbols]

 1 Shield body 3 Front tail ring 4 Rear tail ring 5 Tail seal 5a Tail seal 5b Tail seal 5c Tail seal 8 Spacer 9 Solidifying material

Claims (1)

[Claims] 1. A shield excavator equipped with a tail seal 5 at the rear of a shield body 1 for excavating in the ground, which comes into sliding contact with an outer peripheral surface of a segment 7 assembled along an inner wall of a tunnel to prevent intrusion of earth and sand. In addition, a front tail ring 3 is provided at the rear of the shield body 1, and a rear tail ring 4 slidable in the front-rear direction is provided inside the front tail ring 3 so that the front tail ring 3 is The spacer 8 and the tail seal 5a are detachably attached to the inner peripheral surface, the tail seal 5b is fixed to the inner peripheral surface of the rear tail ring 4, and if the tail seals 5a and 5b are worn, the rear tail ring 4 side Tail seal 5b
Is fixed to the segment 7 by the solidifying material 9, the front and rear tail rings 3 are separated, the spacer 8 and the tail seal 5a on the front tail ring 3 side are removed, and a new tail seal 5c is attached to the front tail ring 3. Tail seal exchanging device for shield machine installed on the peripheral surface.