JP2003262094A - Lining body of shield tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lining body of a shield tunnel which can surely assemble segments by preventing occurrence of irregularity and deviation of a joining face between the segments when prestress is introduced in the circumferential direction of the tunnel. <P>SOLUTION: A plurality of the segments 1 of an RC structure are mutually adjacently assembled on an inner circumference of the tunnel in the circumferential direction and axial direction. The prestress is introduced to join the adjacent segments 1 by PC tendons 2 in the circumferential direction of the tunnel. The adjacent segments 1 in the axial direction of the tunnel are joined by rock pins 3 comprising projection fittings 5 and recess fittings 6. In addition, an alignment mechanism 4 for preventing the irregularity and deviation of the joining face is incorporated in the joining face between the adjacent segments 1 and 1 in the circumferential direction of the tunnel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel lining body constructed by assembling a plurality of concrete segments in a tunnel circumferential direction and an axial direction, and particularly prestressing concrete segments adjacent to each other in the tunnel circumferential direction. It is used in the case of introducing and joining integrally.

[0002]

2. Description of the Related Art As a lining material for a shield tunnel, concrete segments such as those shown in FIGS. 5 (c) and 5 (d) are widely used. As shown in a) and (b), first, a concrete segment 20 of the same shape formed in this division is built, and finally, a wedge-shaped key segment 21 having different dimensions at both axial ends of the tunnel. 1 ring is assembled by incorporating.

Further, the segment 20 and the key segment 21 which are incorporated as a lining material in the circumferential direction of the tunnel are continuous to the respective segments 20, 21 in the circumferential direction as shown in FIG. 5 (a), for example. Pre-stress is introduced in the circumferential direction of the tunnel with the inserted PC tension member 22 and the segments 20 and 21 adjacent to each other in the axial direction of the tunnel are connected to each other as shown in FIG. Joint hardware 22, 22 embedded in the side of the
Are joined by fastening bolts 23.

[0004]

However, if the segments 20 and 21 which are adjacent to each other in the circumferential direction of the tunnel are to be joined by the above-described method, the segments 20 and 2 are
Since 1 moves inward and the diameter of the entire segment ring is reduced, the edge portions of the respective segments 20, 21 on the tunnel axial direction side are the fastening bolts 23 as described above in the existing segments.
However, there is a problem that the diameter reduction of the segment ring is restricted and the prestress as designed cannot be introduced in the circumferential direction of the tunnel.

On the other hand, if prestress is introduced in the circumferential direction of the tunnel without connecting the edge portions on the tunnel axial direction side of the respective segments 20, 21 to the existing segments, the respective segments 20, 21 will be evenly distributed. Without moving to
Not only does the joint accuracy between the segments 20 and 20 occur due to the opening and misalignment, but also the accuracy of the key segment 2
There was a problem that 1 was shifted to the face side and prestress could not be introduced.

The present invention has been made in order to solve the above problems, and prevents the occurrence of misalignment or misalignment of the joint surface between the segments particularly when introducing prestress in the circumferential direction of the tunnel. An object of the present invention is to provide a shield tunnel lining body capable of reliably assembling the segments.

[0007]

According to a first aspect of the present invention, there is provided a shield tunnel lining body in which a plurality of concrete segments are assembled adjacent to each other in a circumferential direction and an axial direction of the tunnel, and the adjacent concrete segments are connected to each other. In a shield tunnel lining body in which a prestress is introduced by a PC tension member inserted in the circumferential direction of the tunnel or in the circumferential direction and the axial direction, concrete segments adjacent to each other in the axial direction of the tunnel are adjacent to each other. It is characterized in that it is slidably joined in the radial direction of the tunnel by a joint which is attached to the joining surface of the concrete segment and is composed of a convex member and a concave member and locked in the axial direction of the tunnel.

As the concrete segment used here, in addition to the RC segment, a steel shell concrete segment or the like can be used if prestress can be introduced.

A shield tunnel lining according to a second aspect of the present invention is the shield tunnel lining according to the first aspect, wherein the convex member has an enlarged diameter portion at a tip portion thereof, and the diameter of the convex member is within the concave member. The concave member is provided with a wedge ring that fits with the enlarged diameter portion.

According to a third aspect of the present invention, there is provided a shield tunnel lining body according to the first aspect, wherein the convex member is provided with a connecting pin that slides in the concave member in a radial direction thereof. The member is characterized by including an insert having an engaging claw that fits with the connecting pin on the inner circumference.

The fitting claw in this case may be, for example, one that is continuous in the shape of a rib in the circumferential direction of the insert and is provided in a plurality of steps at predetermined intervals.

According to a fourth aspect of the present invention, there is provided a shield tunnel lining body according to the first, second or third shield tunnel lining body, wherein the joint surfaces of concrete segments adjacent to each other in a circumferential direction and / or an axial direction of the tunnel. It is characterized in that an aligning mechanism including a rotating body and a concave portion is attached to the.

The rotating body in this case is, for example, made of steel,
A sphere or columnar body made of reinforcing fiber reinforced cement, wood, or the like can be used, and a metal having a groove-shaped recess that can be engaged by a rotating body may be embedded in the joint surface of the concrete segment as the recess, or The groove may be formed directly on the joint surface of the concrete segment so as to be continuous in the axial direction of the tunnel.

According to a fifth aspect of the present invention, in a shield tunnel lining body, a plurality of concrete segments are assembled adjacent to each other in the circumferential direction and the axial direction of the tunnel, and the adjacent concrete segments are assembled in the circumferential direction or the circumferential direction of the tunnel. In a shield tunnel lining body in which a prestress is introduced by a PC tension material inserted in the axial direction and the axial direction, and in the circumferential direction of the tunnel and / or
Alternatively, it is characterized in that a centering mechanism composed of a rotating body and a concave portion is attached to a joint surface of concrete segments adjacent to each other in the axial direction.

[0015]

1 and 2 show an example of a shield tunnel lining of the present invention. In the figures, a plurality of RC structure segments 1 are provided on the inner circumference of the tunnel, in the circumferential and axial directions of the tunnel. Are assembled next to each other.

Further, the segments 1 adjacent to each other in the circumferential direction of the tunnel are joined by PC prestressing material 2 by introducing prestress, and the segments 1 adjacent to each other in the axial direction of the tunnel are joints 3 (hereinafter, referred to as "lock pin 3"). ")
Are joined by.

Further, on the joint surface between the segments 1 and 1 which are adjacent to each other in the circumferential direction of the tunnel, a centering mechanism 4 (see FIGS. 4A to 4C) for preventing misalignment and displacement of the joint surface. Is built in.

A through hole 1a communicating with the circumferential direction of the tunnel is formed in each segment 1 along the arcuate shape of the segment 1, and a PC tension member 2 is continuous between the plurality of segments 1 and 1 in the through hole 1a. Have been inserted. Then, by tensioning the PC tension member 2, prestress is introduced between the plurality of segments 1 and 1 that are adjacent to each other in the circumferential direction of the tunnel, and they are joined to each other.

A convex member 5 (hereinafter referred to as "convex metal member 5") as one joint metal member of the lock pin 3 is provided on one joint surface of the segments 1 and 1 adjacent to each other in the axial direction of the tunnel.
And a concave member 6 (hereinafter referred to as "concave metal member 6") is embedded as the other joint metal member of the lock pin 3 in the other joint surface.

The convex metal piece 5 includes an anchor 5a and a connecting pin 5b.
It is formed from and. A tubular portion 5c is formed at a predetermined depth on the tip side of the anchor 5a, and a slit 5d is formed on the side portion of the tubular portion 5c over a predetermined length from the tip portion.

An anchor plate 5e is projected from the rear end of the anchor 5a. The anchor 5a is embedded in the concrete of the segment 1 together with the anchor plate 5e in a state where a part of the tubular portion 5c on the tip side is projected to the joint surface. Further, an enlarged diameter portion 5f is formed at the tip of the connecting pin 5b, and the rear end side of the connecting pin 5b is inserted into the tubular portion 5c.

The concave metal piece 6 is formed of a wedge ring 6a, a ring case 6b and an anchor 6c, and the wedge ring 6a is housed in the ring case 6b and the ring case 6b.
Is fixed to the anchor 6c.

The wedge ring 6a is formed to have an inner diameter such that the expanded diameter portion 5f of the connecting pin 5b and the distal end portion of the tubular portion 5c of the anchor 5a can be inserted at the same time, and the inner peripheral surface of the wedge ring 6a extends inward. It is formed in a tapered shape that gradually expands in diameter (toward the anchor 6c side).

Further, a rib 6d is provided at the opening end of the ring case 6b on the tip side (connecting pin 5b side) so as to prevent the wedge ring 6a from coming off.

The enlarged diameter portion 5f of the connecting pin 5b is inserted into the wedge ring 6a in the ring case 6b, so that the segments 1 adjacent to each other in the axial direction of the tunnel are joined to each other. In this case, when the expanded diameter portion 5f of the connecting pin 5b and the distal end portion of the tubular portion 5c of the anchor 5a are inserted into the wedge ring 6a in the ring case 6c, the expanded diameter portion 5f hits the anchor 6c and the connecting pin 5b moves to the anchor 5a. It is pushed into the tubular portion 5c. At this time, the cylindrical portion 5c is pushed and expanded by the enlarged diameter portion 5f, and the enlarged diameter portion 5f is fitted to the wedge ring 6a, so that the convex metal piece 5 and the concave metal piece 6 are fitted to each other. The segments 1 adjacent to each other in the axial direction are joined together.

The outer diameter of the wedge ring 6a is greater than the inner diameter of the ring case 6b, and the anchor 5a (anchor 5a
Since the outer diameter of the front end portion (cylindrical portion 5c) of a is formed to be slightly smaller than the inner diameter of the rib 6d, the connecting pin 5b is slidable in the radial direction of the ring case 6b, so that the concrete segment 1 , 1 is slid in the radial direction of the tunnel, and therefore the PC tension member 2 is tensioned, whereby prestress can be smoothly introduced in the circumferential direction of the tunnel.

3A to 3C show another example of the lock pin 3, in which one joint of the lock pin 3 is attached to one joint surface of the segments 1 and 1 adjacent to each other in the axial direction of the tunnel. A convex member 7 (hereinafter referred to as "convex metal member 7") is provided as a metal member, and a concave member 8 (hereinafter referred to as "concave metal member 8") is embedded as the other joint metal member of the lock pin 3 on the other joint surface. ing.

The convex metal piece 7 includes an anchor 7a and a connecting pin 7b.
It is formed from and. A screw hole 7c is formed at a predetermined depth on the tip side of the anchor 7a. Further, the front end side and the rear end side of the connecting pin 7b are externally threaded, and the external threaded portion on the rear end side is screwed into the screw hole 7c of the anchor 7a, so that the connecting pin 7b projects to the front end part of the anchor 7a. It is set up.

The concave metal member 8 is composed of an insert 8a and an anchor 8b fixed to the rear end of the insert 8a by welding or the like, and fitting claws 8c protruding toward the inner side of the insert 8a are projected in several steps. It is set up. The tip end side of the connecting pin 7b of the convex metal piece 7 is inserted into the insert 8a, so that the segments 1 adjacent to each other in the axial direction of the tunnel are joined to each other.

In this case, the male screw portion on the tip side of the connecting pin 7b is fitted with the fitting claw 8c in the insert 8a,
The convex metal piece 7 and the concave metal piece 8 are fitted to each other, whereby the segments 1 adjacent to each other in the axial direction of the tunnel are joined.

The outer diameter of the connecting pin 7b is the insert 8
Since the connecting pin 7b can be slid in the radial direction of the insert 8a by being formed to have a diameter slightly smaller than the inner diameter of a, the joint surface between the concrete segments 1 and 1 slides in the radial direction of the tunnel, and therefore PC By pretensioning the tension member 2, prestress can be smoothly introduced in the circumferential direction of the tunnel.

The aligning mechanism 4 is composed of a rotating body 9a embedded in one of the joint surfaces between the segments 1 and 1 adjacent to each other in the circumferential direction of the tunnel, and a recess 9b formed in the other joint surface. ing. The rotary body 9a and the recess 9b are engaged at the same time as the assembling of the segments 1 and 1, so that no misalignment or misalignment of the joint portion occurs.

The rotating body 9a is rotatably embedded in the joint surface of the segment 1 with a half of the protruding portion. On the other hand, the concave portion 9b has an inner diameter that allows the protruding portion of the rotating body 9a to be engaged in a rotatable state, and is formed in a substantially groove-shaped cross section that is continuous for a predetermined length in the axial direction of the tunnel.

[0034]

The invention of the present application is as described above.
Especially between segments that are adjacent to each other in the axial direction of the tunnel,
Locking pins made up of a concave member and a convex member attached to both joint surfaces are slidably joined in the radial direction of the tunnel, so when introducing prestress in the circumferential direction of the tunnel, each segment By moving toward the center of the tunnel, the diameter of the entire segment ring can be reduced, so that prestress can be reliably introduced in the circumferential direction of the tunnel.

Further, since the aligning mechanism for preventing the misalignment of the joining surfaces is attached to the joining surfaces of the respective segments, the respective segment move uniformly in the central direction of the tunnel, so that the entire segment ring is Since it is possible to reduce the diameter evenly, by introducing prestress in the circumferential direction of the tunnel, there is no risk of misalignment or gaps in the joint surface of each segment, and the lining of the shield tunnel with high construction accuracy is possible. You can build your body.

[Brief description of drawings]

FIG. 1 shows an example of a tunnel lining body made of concrete segments, (a) is a cross-sectional view of the shield lining body,
(B) is a cross-sectional view taken along line ii in (a), (c),
(D) is the top view and end view of a concrete segment, respectively.

2A and 2B show an example of a convex metal piece and a concave metal piece of a lock pin, wherein FIG. 2A is a sectional view before coupling, FIG. 2B is a sectional view after coupling, and FIG. 2C is a perspective view.

3A and 3B show an example of a convex metal piece and a concave metal piece of a lock pin, where FIG. 3A is a sectional view before coupling, FIG. 3B is a sectional view after coupling, and FIG. 3C is a perspective view.

4A and 4B show an example of an alignment mechanism, FIG. 4A is a sectional view before coupling, FIG. 4B is a sectional view after coupling, and FIG. 4C is a perspective view.

FIG. 5 shows an example of a conventional tunnel lining body made of concrete segments, (a) is a cross-sectional view of the shield lining body, (b) is a cross-sectional view taken along the line ii in (a), (c),
(D) is a plan view of a concrete segment, an end view thereof, and (e) is a sectional view of a joint portion of the concrete segment.

[Explanation of symbols]

1 segment 2 PC tension material 3 Lock pin (joint) 4 Alignment mechanism 5 Convex hardware (convex member) 6 Recessed hardware (concave member) 7 Convex hardware (convex member) 8 Recessed hardware (concave member) 9a Rotating body 9b recess

Continued front page    (72) Inventor Yasuyuki Hayakawa             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Masanori Matsuura             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Koichi Tamada             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation (72) Inventor Hideo Arai             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Kyoji Takemura             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Masashi Kaneko             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation F term (reference) 2D055 BA01 BB01 CA01 GC01 GC02                       LA00 LA11

Claims (5)

[Claims] 1. A plurality of concrete segments are assembled so as to be adjacent to each other in the circumferential direction and the axial direction of the tunnel, and the adjacent concrete segments are inserted in the circumferential direction of the tunnel or in the circumferential direction and the axial direction.
In a shield tunnel lining body formed by introducing and pre-stressing with a C tension material, concrete segments adjacent to each other in the axial direction of the tunnel have a convex member attached to the joint surface of the adjacent concrete segments. A shield tunnel lining body, which is slidably joined in a radial direction of the tunnel by a joint composed of a concave member and locked in the tunnel axial direction. 2. The convex member has an enlarged diameter portion at a tip end thereof and a connecting pin slidable in a radial direction within the concave member, and the concave member is a wedge ring fitted with the enlarged diameter portion. The shield tunnel lining body according to claim 1, further comprising: 3. The convex member includes a connecting pin that slides in the concave member in the radial direction, and the concave member includes an insert having an engaging claw that fits the connecting pin on the inner circumference. The lining body of the shield tunnel according to claim 1. 4. A centering mechanism comprising a rotating body and a concave portion is attached to a joint surface of concrete segments adjacent to each other in the circumferential direction and / or the axial direction of the tunnel. The shield tunnel lining body described. 5. A plurality of concrete segments are assembled adjacent to each other in the circumferential direction and the axial direction of the tunnel, and the adjacent concrete segments are inserted in the circumferential direction of the tunnel or in the circumferential direction and the axial direction of the tunnel.
In a shield tunnel lining body in which pre-stress is introduced and joined by a tension material, a centering mechanism in which a rotating body and a concave portion are formed on the joint surface of concrete segments adjacent to each other in the circumferential direction and / or the axial direction of the tunnel. A shield tunnel lining body characterized by being attached.