JPH07229392A - Water stopping method for tail section of shield machine - Google Patents

Abstract

PURPOSE:To gradually keep a ring type seal material in pressed contact state with the advance of a shield machine, and provide an effective water stopping effect by gradually reducing backward the diameter of the internal surface of a shield machine tail. CONSTITUTION:Ring type seal materials 3 and 3 fastened to the external surface of segments 5 and 5 are gradually pressed with the reduced diameter section of the internal surface of a tail section 4 with the advance of a shield machine 1. The materials 3 and 3 are pressed to the internal surface most strongly at the rear end of the tail section 4, thereby providing an effective water stopping effect. When the seal material 3 comes to the rear end of the tail section 4, the next segment 5 is connected and a new seal material 3 is laid inside the tail section 4. Thus, the seal material 3 is provided at two positions. Subsequently, the seal material 3 at the rear end of the tail section 4 is released from a tail with the advance of the shield machine 1, and a water stopping effect disappears. The inner seal material 3, however, gradually enters the reduced diameter section and instead provides a water stopping effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of stopping water in a tail portion of a shield machine during tunneling.

[0002]

2. Description of the Related Art A tail seal of a shield machine is a tail seal fixed to the rear end surface of the tail section of the shield machine.
It prevents groundwater, backfill filler, etc. from the rear of the shield machine, from entering the shield machine.

Within the tail portion of the shield machine, a plurality of segment bodies divided according to the tunnel diameter are assembled in a ring shape along the inner peripheral surface of the tail portion. Generally, a shield machine is advanced by a shield jack using the assembled segments as a reaction force.

As the structure of the tail seal, there is often used a method of fixing the tail seal 8 to the rear end surface of the tail portion of the shield machine main body 1 as shown in FIG. There is. Further, in recent years, a technique of installing a plurality of tail seals on the inner peripheral surface of the tail portion of the shield machine body 1 has been developed for the purpose of improving the water blocking performance.

[0005]

However, the above-mentioned prior art has the following problems. Although the tail seal provided on the tail part of the shield machine main body will improve the waterproof performance to some extent due to the development of the sealing material, etc.
Frequent wear of the tail seal and segment is repeated due to long-term shield excavation, causing damage to the tail seal and causing groundwater, backfill filler, etc. to pass through the damaged portion of the tail seal and enter the shield machine. there were.
Further, even in the technology of installing a plurality of tail seals on the inner peripheral surface of the tail portion, it is not possible to prevent damage to the tail seals due to wear, and the ingress of groundwater, backfill filler, etc. is somewhat delayed, The problem has not been solved yet.

Furthermore, when a segment having a corrugated shape in the direction of excavation or a segment having an uneven shape is used, the tail seal method described above does not allow the tail seal to come into contact with the segment, resulting in severe groundwater or the like. Intrusion occurs.

In view of the problems of the prior art as described above, the present invention provides a tail seal method for maintaining high water shutoff even in segments of any shape.

[0008]

That is, the structure of the present invention is a method of stopping water at the inner peripheral part of the tail part and the outer peripheral part of the segment of a shield machine, in which a ring-shaped sealing material is fixed to the outer peripheral part of the segment at a predetermined interval. The inner diameter of the tail of the shield machine is gradually reduced inwardly toward the rear so as to be thickened inward.

As the sealing material fixed to the outer peripheral portion of the segment in a ring shape, it is possible to use a sealing material such as rubber used in the prior art. The size of the tail seal material is such that it comes into contact with the inner surface of the outer cylinder of the shield machine.

When a segment having a corrugated shape or an uneven shape in the direction of excavation is used, a standard segment having a predetermined length and a joint segment having a smooth outer periphery are manufactured, and the outer periphery of the joint segment is formed. Fix the sealing material on. The joining segments are installed and connected between standard segments.

The inner peripheral surface of the tail portion of the shield machine is constructed so that the diameter thereof gradually decreases toward the rear toward the inside. As a configuration of the inner peripheral surface of the tail portion, another method may be used in which thin steel plates are gradually shifted rearward to overlap and thicken.

[0012]

[Function] The ring-shaped seal material fixed to the outer peripheral portion of the segment is gradually pressed against the inner diameter of the tail portion by the reduced diameter portion of the inner surface of the tail portion as the shield machine advances. It will be pressed against and will exhibit an effective water blocking effect. When the sealing material comes to the rear end of the tail portion, the next segment is connected, the sealing material is newly installed inside the tail portion, and it is in a state of being installed at two places.
Then, as the shield machine advances, the sealing material at the rear end of the tail part comes off the tail of the shield machine and loses the water blocking effect, but the inner sealing material gradually enters the reduced diameter part and exerts the water blocking effect.

As described above, since the seal material is sequentially updated for each stroke of the shield jack, the seal material is not damaged due to wear. In addition, it is easy to deal with any damage.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view for explaining in detail the method of stopping water in the tail portion of the shield machine of the present invention. The inner peripheral surface of the tail portion 4 on the rear side of the shield machine main body 1 is manufactured by gradually reducing the diameter toward the inner side toward the rear. In the shield machine body 1, the standard segment 5 and the joining segment 2 are connected. A seal material 3 is fixed to the outer peripheral portion of the joining segment 2 in a ring shape. Seal material 3
As the rubber, a commonly used rubber or the like may be used.

1 of the standard segment 5 and the joining segment 2
The length of the set is one stroke length of the shield jack, and is manufactured such that the sealing material 3 of the joining segment 2 does not come off from the tail portion 4 of the shield machine.

In the present embodiment, a segment having a corrugated or concave-convex shape in the direction of excavation has been described. However, when the outer peripheral surface of the segment is smooth, one set of standard segment 5 and joining segment 2 All you have to do is make a segment. Seal material 3 in this case
The position of is fixed to the outer periphery of the front part of the segment.

FIG. 2 is a vertical cross-sectional view for explaining the shield excavation situation. The shield excavation main body 1 has an excavation mechanism at its tip, and a standard segment and a joining segment are alternately connected in the tail portion 4 of the construction method to form a tunnel rearward. A shield jack 7 is provided at the tip of the joining segment 2 in the tail portion 4 to propel the shield machine main body 1 forward by using the segment as a reaction force. Along with the propulsion, the excavation mechanism at the tip simultaneously excavates the ground.

FIG. 3 is a transverse sectional view for explaining the tail portion 4 of the shield machine main body 1. Shield machine 1
A sealing material 3 is inserted between the tail portion 4 and the joining segment 2 in a pressed state.

Next, the construction method of this embodiment will be described. While driving the tip excavation mechanism of the shield machine 1 from inside the starting shaft, the shield machine body 1 is excavated by excavating the ground.
Promote into the ground. When the propulsion of the shield machine 1 is completed, the standard segment 5 and the joining segment 2 are assembled in the tail portion 4 of the shield machine body 1 as one set. When the assembly is completed, the shield jack 7 provided in the shield excavator main body 1 is extended to advance the shield excavator main body 1. The seal member 3 fixed to the outer peripheral portion of the joining segment 12 along with the advance of the shield machine main body 1 has the inner peripheral portion of the tail portion 4 whose diameter is reduced toward the rear, so that the inner surface of the tail portion 4 is gradually increased. It will be in a state of being pressed against. At the time when one stroke of the shield jack 7 has been extended, the sealing material 3 remains at the rear end of the tail portion 4.

When the extension of the shield jack 7 is completed, the shield jack 7 is reduced and the next standard segment 5
And the joining segment 12 are connected. At this time, the sealing material 3
Is installed in two places on the inner peripheral portion of the tail portion 4.
When the assembly and connection of the segments are completed, the shield jack 7 is extended and the shield machine body 1 is advanced. With the forward movement of the shield machine main body 1, the rear sealing material 3 comes off from the tail portion 4 and loses the water blocking effect, but the front sealing material 3 is pressed against the inner surface of the tail portion 4 by the diameter reducing mechanism. Then, the water stopping effect is exhibited.

By repeating the above-mentioned method in sequence, safe and efficient shield excavation is carried out.

As for the segments, as described above, if the outer surface of the segment is smooth, only one set of segments is required. In addition, a method is adopted in which the segment is divided into a plurality of segment bodies according to the tunnel diameter and assembled.

[0022]

According to the water stopping method of the present invention, the wear of the sealing material is performed only once, so that frequent wear as in the conventional method is eliminated, and the entry of ground water or the like into the shield machine is completely prevented. it can. In addition, since the sealing member closes the gap in a state of being pressed against the tail portion by the diameter reducing mechanism of the inner peripheral surface of the tail portion of the shield machine main body, a complete waterproofing effect can be expected.

[0023]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating a method of stopping water in a tail portion of a shield machine according to the present invention.

FIG. 2 is a vertical cross-sectional view explaining a shield excavation situation.

FIG. 3 is a cross-sectional view illustrating a tail portion of the shield machine main body.

[Explanation of symbols]

 1 Shield machine 2 Bonding segment 3 Sealing material 4 Tail part 5 Standard segment 6 Backfilling material 7 Shield jack 8 Tail seal of conventional technology

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[Procedure amendment]

[Submission date] October 28, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating a method of stopping water in a tail portion of a shield machine according to the present invention.

FIG. 2 is a vertical cross-sectional view explaining a shield excavation situation.

FIG. 3 is a cross-sectional view illustrating a tail portion of the shield machine main body.

FIG. 4 is a vertical cross-sectional view illustrating a method of stopping water in a tail portion of a shield machine according to a conventional technique.

[Explanation of symbols] 1 shield machine main body 2 joining segment 3 sealing material 4 tail part 5 standard segment 6 backfilling filler 7 shield jack 8 conventional tail seal

Claims (1)

[Claims] 1. A method for stopping water at the inner peripheral portion of the tail portion and the outer peripheral portion of a segment of a shield machine, wherein a seal material is fixed to the outer peripheral portion of the segment at a predetermined interval in a ring shape,
A method of stopping water in a tail portion of a shield machine, characterized in that the inner diameter of the tail portion of the shield machine is gradually reduced inwardly toward the rear.