JP4857133B2 - Segment ring joint structure - Google Patents

Description

  The present invention relates to a joint structure of segment rings, and can also be applied to a curved portion of a shield tunnel.

  A segment ring is assembled by installing a plurality of segments in the tunnel while being joined together in the circumferential direction, and the inner circumference of the tunnel is covered by installing in the tunnel while joining together in the axial direction. ing.

  As shown in FIG. 3, for example, a segment 5 provided with a taper (inclined surface) 5a inclined with respect to the axial direction of the tunnel is used in combination with a normal segment 6 as shown in FIG. It has been.

  In FIG. 3, a symbol T indicates a tapered segment ring formed of a segment with a taper, and a symbol S indicates a non-tapered segment ring formed of a normal segment.

  By the way, as a method of joining the segment rings adjacent to each other in the axial direction of the tunnel, for example, as shown in FIG. 4, male joints 7 and female joints provided on the face side and the wellhead side of each segment ring 5 and 6, respectively. A joint structure of segment rings is known in which 8 are fitted together to join the segment rings 5 and 6 together.

  In addition, assembling methods of the segments are performed by shifting the segments in the circumferential direction of the segment ring so that the joint positions between the segments do not become ivy. For example, FIG. 4 is an example of rotating 30 degrees.

JP 2005-105758 A

  However, in curve construction, it is difficult to assemble as the target line, and in order to approach the planned line, the taper segment and the straight segment are used together to approximate the planned line.

  When the construction accuracy of the sharp curve part or the curved part is required, it is unavoidable to produce a plurality of types of taper segments, which increases the cost.

  In the conventional joints between segment rings, the number of face side joints (female joints) and the wellhead side joints (male joints) are the same, and the segments are shifted in the circumferential direction of the segment ring so that the joint positions between the segments do not become imitation. For example, in the example of FIG. In this case, it has been difficult to correct if there is a deviation from the planned line.

  The present invention has been made to solve the above-described problems, and in particular, when a plurality of segment rings are installed on a curved portion of a tunnel while being joined together, the plurality of segment rings are arranged along the curved shape of the tunnel curved portion. It is an object of the present invention to provide a joint structure for a segment ring which can be installed and can be easily meandered and corrected.

  The joint structure of the segment ring according to claim 1 is a joint structure of segment rings installed adjacent to each other in the axial direction of the tunnel, and is fitted to the joint surface on the wellhead side and the face side of the segment ring. A plurality of male joints and female joints are provided at predetermined intervals in the circumferential direction of the segment ring, the female joints are provided more than the male joints, and the female joints to which the male joints fit according to the construction situation of the tunnel are provided. It is characterized in that it can be used selectively.

  In the present invention, by increasing the number of face side joints (female joints) of the joints between segment rings than the number of wellhead side joints (male joints), the assembly pattern of the segments can be doubled. Thereby, various taper amounts can be obtained at the time of curve construction and the like while reducing costs.

  When joining segment rings adjacent to each other in the axial direction of the tunnel, rotate the segment ring in the circumferential direction of the tunnel to adjust the position of the segment ring, and then fit the male joint to the female joint at an arbitrarily selected position. By joining the rings, it is possible to absorb the construction error and join the rings to the most fitted state. In this case, the number of male joints and female joints is about 2 and 4 respectively, which is the most economical, and the rings can be joined firmly.

  The joint structure of the segment ring according to claim 2 is the joint structure of the segment ring according to claim 1, wherein a taper that intersects the axial direction of the tunnel is provided on the joint surface of the segment ring on the wellhead side or the face side. It is characterized by.

  The present invention is a joint structure for joining the segment rings in the curved part of the tunnel. In this case, by rotating the segment ring in the circumferential direction, the horizontal direction of the segment ring is adjusted to the curved shape of the tunnel. The ring can be easily joined by fitting the male joint to any one selected from a plurality of female joints at the same time. Further, the segment rings from the straight line part of the tunnel to the curved part or from the curved part to the straight line part can be easily joined.

  In this case, the horizontal direction of the segment ring can be changed by rotating the segment ring in the circumferential direction, but at the same time, the direction of the segment ring also changes in the vertical direction. It is better to change the horizontal direction of the segment ring.

  Further, since only one type of segment with a taper needs to be prepared, only one type of segment forming mold is required, and the manufacturing cost of the segment can be reduced.

  According to the present invention, a plurality of male joints and female joints are provided at predetermined intervals in the circumferential direction of the segment ring, and the female joints are formed from the male joints. When connecting segment rings adjacent to each other in the axial direction of the tunnel, the segment ring is appropriately rotated in the circumferential direction to position the segment ring, and then the male joint is connected to a plurality of female joints. Since it suffices to fit the female joint at the most suitable position selected from the joints, the positioning of the segment rings and the joining of the segment rings can be easily performed.

  In addition, when joining the segment rings installed in the curved part of the tunnel, a taper that is inclined in a direction intersecting the axial direction of the tunnel is provided on the joint surface on the wellhead side or the face side of the segment ring, By rotating the segment ring appropriately in its circumferential direction, its orientation can be changed freely, and more female joints are provided than male joints. Since the segment rings can be coupled to each other, a plurality of segment rings can be installed along the curved shape of the tunnel, and the meandering correction of the segment rings can be easily performed. Furthermore, it can be used from a position such as a tapered segment before and after the curve construction section according to the construction situation.

  FIG. 1 shows a plurality of segment rings installed while being joined to each other in the axial direction in the curved portion of the tunnel, and FIGS. 2A to 2C show the positional relationship between the segment rings joined to each other. It is a thing.

  In these drawings, the segment ring 1 is assembled in a substantially circular shape by installing a plurality of segments 2 while being joined together in the circumferential direction of the tunnel. In addition, a taper (inclined surface) 1 a that is inclined at a predetermined angle with respect to the axial direction of the tunnel is provided on the joint surface on the wellhead side of each segment ring 1. Is formed at an arbitrary inclination.

  Further, the male joint 3 is provided on the joint surface on the wellhead side of each segment ring 1 and the joint surface on the face side, that is, the joint surface on the wellhead side of each segment 2, and the joint surface on the face side of each segment 2 is female. Each joint 4 is provided. A plurality of male joints 3 and a plurality of female joints 4 are provided at predetermined intervals in the circumferential direction of the segment ring 1, and the female joints 4 are larger than the male joints 3 and narrower than the installation interval (pitch) of the male joints 3. It is provided at intervals.

  The plurality of segment rings 1 configured in this manner are installed adjacent to each other in the axial direction in the curved portion of the tunnel as shown in FIG. The segment rings 1 are joined to each other by appropriately rotating in the circumferential direction so that the direction thereof matches the curved shape of the curved portion of the tunnel, and the male joint 3 and the female joint 4 are fitted together.

  FIGS. 2A to 2C show the positional relationship between the segment rings 1 and 1 that are installed while being joined to each other in the axial direction of the tunnel, and FIG. 2A shows the segment ring 1 rotated by 15 ° in the circumferential direction. The direction is adjusted, and the male joint 3 and the female joint 4 are fitted together to join the segment rings 1 to each other. (B) and (c) show the segment rings 30 ° in the circumferential direction, The direction of the segment ring 1 is determined by rotating 45 degrees, and the segment ring 1 is joined by fitting the male joint 3 and the female joint 4 together.

  In any case, although the horizontal direction of the segment ring 1 can be changed by rotating the segment ring 1 in the circumferential direction, the vertical direction also changes at the same time, so the direction in which the segment ring 1 is rotated. The segment ring 1 is preferably rotated so as not to be biased in one direction.

It is a top view which shows the several segment ring installed in the curved part of the tunnel, joining mutually in the axial direction. The positional relationship between the segment rings joined to each other in the axial direction of the tunnel is shown, (a) is a development view of the segment ring showing the case where the segment rings are joined by rotating 15 ° in the circumferential direction of the tunnel, (b) A developed view of the segment ring showing the case where the segment ring is joined by rotating 30 ° in the circumferential direction of the tunnel, and (c) is a segment ring showing the case where the segment ring is joined by rotating 45 ° in the circumferential direction of the tunnel FIG. It is a top view which shows the prior art example of the several segment ring installed in the curved part of the tunnel, joining mutually in the axial direction. It is an expanded view of the segment ring of the prior art example which shows the positional relationship between the segment rings joined mutually in the axial direction of a tunnel.

Explanation of symbols

1 Segment Ring 2 Segment 3 Male Joint 4 Female Joint 5 Segment Ring 6 Segment Ring

Claims (2)

  A joint structure of segment rings installed adjacent to each other in the axial direction of the tunnel, wherein a male joint and a female joint that are fitted to each other on the joint surface on the wellhead side and the face side of the segment ring are arranged in the circumferential direction of the segment ring. A plurality of female joints are provided at predetermined intervals, and the female joints are provided more than the male joints, and the female joints to which the male joints fit can be selectively used according to the construction situation of the tunnel. Segment ring joint structure. The joint structure for a segment ring according to claim 1, wherein a taper that is inclined in a direction intersecting with the axial direction of the tunnel is provided on a joint surface on the wellhead side or face side of the segment ring.

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