JP2001182493A - Flexible coupling and work execution method of shield tunnel using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible coupling simple in structure and free to directly install on a general segment and a work execution method of a shield tunnel using this flexible coupling. SOLUTION: This flexible coupling 10 is to be clamped and fixed between rings of a pair of segments 12, 12' and includes an outside ring 14 made of a rubber type elastic body and an inside ring 16 installed on its inner peripheral surface side. This flexible coupling 10 is furnished with a space part made of a groove of the outside ring 14 and a groove of the inside ring 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint disposed between segment rings and a method for constructing a shield tunnel using the flexible joint.

[0002]

2. Description of the Related Art Conventionally, in the construction of a tunnel by a shield method, a face is excavated by a steel tube (shield excavator) corresponding to a cross-sectional size of the tunnel.
Immediately assembling a plurality of lining materials called segments in the circumferential direction of the tunnel to form a segment ring, and pressing the side of the segment ring with a hydraulic jack,
A method of propelling an excavator has been adopted.

When constructing a shield tunnel, a member called a flexible segment (or a flexible joint) provided between a pair of segment rings is provided in order to cope with uneven settlement of the ground or the like (particularly). Fairness 2-228
No. 18, Japanese Patent No. 1016247, Japanese Unexamined Patent Application Publication No.
-82279). This flexible segment
The above-mentioned segment is divided, and a water-stopping rubber member such as a rubber film or a rubber gasket, which can expand and contract in the axial direction of the tunnel, is attached to the divided portion. Is added to the segment.

FIG. 8 is an enlarged view of a main portion showing a state in which such a flexible segment is interposed between the segment rings and the two segment rings are connected. As shown in FIG. 8, a primary waterproof rubber 92 is provided between inner plates 91 of the pair of segment rings 90 facing each other to prevent water from entering and prevent inflow of earth and sand. Further, in the conventional flexible segment, a secondary waterproof rubber 93 which can be expanded and contracted in the axial direction x of the tunnel is stretched inside the waterproof rubber 92, and a steel A jack thrust receiving member 94 composed of a frame body is provided at predetermined intervals along the circumferential direction y of the tunnel.

When the hydraulic jack is pressed against the outer plate 95 of the segment ring 90 to propel the shield excavator, the jack thrust receiving member 94 is stretched between the inner plates 91 facing each other to receive the jack thrust P. It is something that can be done. The jack thrust receiving member 94 is removed after the jack thrust of the shield excavator is no longer transmitted, or the jack thrust receiving member 94 is separated from the inner plate 91 in order to provide the segment with flexibility that can cope with the displacement of the ground. Must be kept free.

A member indicated by reference numeral 96 in FIG. 8 is a spacer provided at predetermined intervals along a circumferential direction between a pair of annular side plates 91 and 95.

[0007]

However, the above-mentioned conventional flexible segment requires an additional work of attaching a water-stopping material, thereby lowering the construction efficiency; depending on the attachment position of the jack thrust receiving member 94, the jack is required. Thrust is eccentric, etc .; the flexible segment itself has a special structure mainly made of steel, so it is expensive and heavy, requiring time and labor for installation work. There was such a problem.

When assembling a conventional flexible segment, a segment made of a material having high axial rigidity is first assembled in a space where the flexible segment is to be incorporated, and the side of the segment is pushed to transmit the jack thrust. After excavating until it stops, the segment made of the material having high rigidity is removed, and a method of fitting a flexible segment into the place is used. However, although this method can secure the attachment of the flexible segment, it requires a material having high rigidity as a substitute for the flexible segment, and requires a lot of time and labor for the attachment. Economic problems arise. This problem is caused by the fact that the function of the jack thrust receiving member and the function of the flexible joint are separated and assigned to separate members.

It is an object of the present invention to provide a member which replaces a conventional flexible segment or a flexible joint, which has a simple structure and can be directly attached to a segment ring without requiring a specially constructed segment. To provide a flexible joint. Another object of the present invention is to
An object of the present invention is to provide a method of constructing a shield tunnel, which can be performed without requiring a complicated operation for attaching and detaching a segment having a special structure, a jack thrust receiving member, and the like.

[0010]

A flexible joint according to the present invention for solving the above-mentioned problems comprises an outer ring made of a rubber-like elastic material which is sandwiched and fixed between the side surfaces of a pair of segment rings. An inner ring attached to the inner peripheral surface side of the outer ring after the jack thrust of the shield excavator is no longer transmitted, wherein the outer ring has an open end on the inner peripheral surface side. An outer ring body defining a groove having a substantially U-shaped cross section, and provided at the opening end;
An inner ring body having a pair of protruding edges fixed to an inner peripheral edge of the segment ring, wherein the inner ring defines a substantially U-shaped groove having an open end on an outer peripheral surface side; And a pair of projecting edges fixed to an inner peripheral edge of the segment ring, and a shaft of the segment ring is inserted into a groove of the outer ring when transmitting jack thrust of the shield excavator. After the jack thrust transmission frame is attached along the direction and the jack thrust is no longer transmitted, the jack thrust transmission frame is removed, and the protruding edge of the outer ring and the protruding edge of the inner ring are Each ring is joined with the opening end of the groove facing inward.

According to the above-mentioned flexible joint of the present invention, it can be manufactured at low cost because of its simple structure, and its handling can be simplified. Further, according to the flexible joint of the present invention, the jack thrust transmitting frame provided on the outer ring disperses the jack thrust of the shield excavator in a well-balanced manner, and transmits this to the already installed segment ring. Thereby, the propulsive force of the shield excavator can be obtained. Furthermore, the flexible joint of the present invention only needs to be directly attached to the segment ring in the tail of the shield excavator, has a very simple structure, and can be easily attached. Therefore, according to the present invention, the construction of the shield tunnel can be realized at extremely low cost as compared with the conventional one.

In the flexible joint of the present invention, (i) the jack thrust transmitting frame is removed from the groove of the outer ring after the jack thrust of the shield excavator is no longer transmitted, and (ii) the outer ring The inner ring and the inner ring are attached with each groove facing inward, so that sufficient space is formed inside the annulus formed by both rings.
By having such a space, according to the flexible joint of the present invention, a force that compresses the segment ring in the axial direction of the tunnel acts on the segment ring, causing a displacement in the axial direction, or a case where the axial direction of the tunnel is changed. It is possible to cope with a case where a displacement occurs in a direction perpendicular to the direction. Further, the displacement generated in the tunnel can be absorbed without suppressing the free movement of the segment ring more than necessary.

[0013] On the other hand, in the shield tunnel construction method according to the present invention, the outer ring of the flexible joint of the present invention is brought into contact with the side surface of the existing segment ring, and the one protruding edge of the outer ring is formed as described above. Attach to the inner peripheral edge of the segment ring, further assemble a new segment ring while contacting the inner peripheral edge of the new segment with the other protruding edge, then attach a jack thrust transmission frame in the groove of the outer ring Digging a shield excavator,
After the jack thrust is no longer transmitted to the jack thrust transmission frame, the jack thrust transmission frame is removed from the groove of the outer ring, and then, the outer ring and the inner joint ring in the flexible joint of the present invention. Is fixed with the opening end of the groove of each ring facing inward, and further, a secondary lining is performed to complete the operation.

According to the shield tunnel construction method according to the present invention, a segment ring is usually constructed without using a segment having a special structure for attaching an outer ring and an inner ring constituting a flexible joint. A shield tunnel can be constructed in the flow of the work process. In addition, the work of attaching the outer ring and the inner ring is simple, and high working efficiency can be obtained, and the attachment and detachment of the jack thrust receiving member, such as a conventional flexible joint or a flexible segment, can be performed. Since such labor and cost can be reduced, the shield tunnel can be constructed at low cost.

[0015]

FIG. 1 is a partially cutaway perspective view showing a joint portion of a shield tunnel constructed by using a flexible joint of the present invention. As shown in FIG. 1, the flexible joint 10 according to the present invention includes an existing shield tunnel 12.
The outer ring 14 is attached to the side of the inner ring 16 and a new segment ring 12 ′ is constructed, and then the inner ring 16 is attached. Reference numeral 17 in FIG.
Secondary lining material.

The outer ring 14 constituting the flexible joint according to the present invention has, as shown in FIG. 2 (a), an outer ring 14 defining an approximately U-shaped groove 18 having an open end on the inner peripheral surface side. It has a ring main body 20 and a pair of protruding edges 22 provided at the opening end and fixed to the inner peripheral edge of the segment ring. On the other hand, as shown in FIG. 2B, for example, the inner ring 16 constituting the flexible joint of the present invention has an inner ring main body defining a substantially U-shaped groove 24 having an open end on the outer peripheral surface side. 26, and a pair of protruding edges 28 provided at the opening end and joined to the protruding edge 22 of the outer ring 14.

The flexible joint according to the present invention includes the outer ring 1 described above.
With the respective grooves 18, 24 of the inner ring 4 and the inner ring 16 facing inward, the joining surfaces 23,
29. The outer ring 14 and the inner ring 16 are usually divided at one or a plurality of positions in the circumferential direction of the shield tunnel, and are entirely annular by attaching a plurality of members when constructing the shield tunnel. The ring should be.
In this case, the seam of each member (that is, the seam formed on the circumferential surface of the outer ring 14 and the inner ring 16) may be provided with a water stop plate made of a water-swelling rubber or the like, if necessary. In addition, the joints of the members may be bonded on site to form a pair of rings.

The construction of a shield tunnel using the flexible joint of the present invention will be described below in order with reference to FIGS. In the construction of the shield tunnel using the flexible joint of the present invention, first, the outer ring 14 is disposed on the side surface 30 of the already installed segment ring 12, and the flange portion 32 of the already installed segment (ie, the segment The inner peripheral edge (in the case of a plate-like segment, the inner surface of the segment) and the protruding edge 22 of the outer ring are inscribed [FIG.
And (b).

Next, the holding plate 34 and the jack thrust transmitting frame 36 are mounted in the groove 18 of the outer ring 14 (see FIG. 3C). Thus, for the time being, the ring 30 is formed by the outer ring 14 by directly contacting the side surface 30 and the flange 32 of the existing segment ring 12 (see FIG. 4). Next, a new segment ring 12 'is constructed adjacent to the ring formed by the outer ring 14 (see FIG. 5A). At this time, a new segment ring 1
2 ′ is the flange portion 32 ′ and the existing outer ring 1
4 so as to be inscribed with the protruding edge 22.

At this stage, the jack thrust transmitting frame 36 provided in the groove 18 of the outer ring 14 is used.
Propell shield excavator. Then, in a state where the jack thrust by the shield excavator is not transmitted, the groove 18
5. Remove the jack thrust transmission frame 36 from FIG.
(b). Further, the jack thrust transmitting frame 36
The joining surface 23 at the protruding edge 22 of the outer ring 14 from which the outer ring 14 has been removed and the joining surface 29 at the protruding edge 28 of the inner ring 16.
The inner ring 16 is attached so that the grooves 18, 24 of each ring face inward (see FIG. 5B).

Next, as shown in FIG.
6 by attaching a dam plate 38 and performing secondary lining,
As shown in FIG. 1, the construction of the shield tunnel joint is completed. In the flexible joint of the present invention, the material used for the outer ring and the inner ring is not particularly limited, as long as it shows sufficient flexibility.
Specifically, various rubbers or plastics can be used.

Further, the materials used for the frame for transmitting the jack thrust and the holding plate are not particularly limited, and a resistance to the jack thrust can be obtained.
What is necessary is just to show rigidity. Specifically, a steel plate or a plastic plate can be used. The frame for transmitting the jack thrust is, for example, a wedge 37 made of steel or plastic as shown in FIG. 7 instead of the member shown in FIG.
It may be.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a joint portion of a shield tunnel constructed using a flexible joint (ring) according to the present invention.

2 (a) is a partially cutaway perspective view showing one embodiment of an outer ring, and FIG. 2 (b) is a partially cutaway perspective view showing one embodiment of an inner ring.

3 (a) is a perspective view showing a side surface of a segment, FIG. 3 (b) is a perspective view showing a state where an outer ring is in contact with the side surface, and FIG. 3 (c) is a holding plate in a mounting groove of the outer ring. It is a perspective view which shows the state which installed the frame for jack thrust transmission.

FIG. 4 is a partially cutaway perspective view showing an overall image of the state shown in FIG. 3 (c).

5 (a) is a perspective view showing a state where a new segment is attached to the side surface of the outer ring shown in FIG. 3 (c), and FIG. 5 (b) is a perspective view showing a state where an inner ring is attached. FIG.

FIG. 6 is a perspective view showing a state in which a weir plate for secondary lining is attached to the inner ring shown in FIG. 5;

FIG. 7 is a perspective view showing a modified example of a jack thrust transmission frame attached to a groove of an outer ring.

FIG. 8 is a sectional view of a main part showing a conventional flexible segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flexible joint 12,12 'segment 14 Outer ring 16 Inner ring 18 Groove (outer ring) 20 Outer ring main body 22 Protrusion 24 Groove (inner ring) 26 Inner ring main body 28 Protrusion 30,30' Segment side surface 32 Flange (Inner circumferential surface of segment) 36 Frame for transmitting jack thrust x Axial direction of shield tunnel

Continued on the front page. (72) Inventor Kazushi Iwasaki 3-6-9, Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Sumitomo Rubber Industries, Ltd. (72) Inventor Minoru Yamamoto 1-1-15-2, Tamagawa Gakuen, Machida-shi, Tokyo (72) Inventor Kinya Shibuya 1-47-15, Kamiikedai, Ota-ku, Tokyo F-term (reference) 2D055 BA01 GD01 3H023 AA05 AB07 AD01

Claims (2)

[Claims] 1. An outer ring made of a rubber-like elastic material sandwiched and fixed between side surfaces of a pair of segment rings, and attached to an inner peripheral surface side of the outer ring after jack thrust of a shield excavator is no longer transmitted. A flexible joint comprising: an outer ring main body defining an approximately U-shaped groove having an open end on an inner peripheral surface side; and an outer ring main body provided at the open end. An inner ring main body having a pair of projecting edges fixed to an inner peripheral edge of the segment ring, wherein the inner ring defines a substantially U-shaped groove having an open end on the outer peripheral surface side, A pair of protruding edges provided at the open end and joined to the protruding edge of the outer ring.When transmitting jack thrust of the shield excavator, in a groove of the outer ring, Jar along the axial direction of the segment ring After the thrust transmitting frame is attached and the jack thrust is no longer transmitted, the jack thrust transmitting frame is removed and the protruding edge of the outer ring and the protruding edge of the inner ring are formed in the groove of each ring. A flexible joint characterized by being joined with its open end facing inward. 2. An outer ring according to claim 1, which abuts against a side surface of an existing segment ring, and one protruding edge of the outer ring is attached to an inner peripheral edge of the segment ring.
Furthermore, after assembling a new segment ring while bringing the inner peripheral edge of the new segment into contact with the other protruding edge, a jack thrust transmission frame is attached in the groove of the outer ring, and the shield excavator is excavated. After the jack thrust is no longer transmitted to the jack thrust transmitting frame, the jack thrust transmitting frame is removed from the groove of the outer ring, and then the outer ring and the inner ring according to claim 1 are connected to each other. A method for constructing a shield tunnel, comprising: fixing an opening end of a groove in an inward direction, and further performing secondary lining.