JP5910962B2 - Segment joint structure - Google Patents

Description

  The present invention relates to a joint structure for segments that connect segments used for inner lining of a tunnel.

  In tunnel construction by the shield method, a segment ring is assembled by connecting arc-shaped segments in the circumferential direction along the inner peripheral surface of the excavation hole on the rear side of the shield excavator, and this segment ring is advanced by the shield excavator. The tunnel is lined up by connecting the tunnels in the direction of the tunnel axis.

  Conventionally, the segment joint that joins between the ring circumferential joints of each segment has been generally joined by bolts, but other joint structures such as a joint structure using a cone connector or a cotter type joint structure Is known (for example, Patent Document 1).

  In such a joint structure using a cone connector or a cotter-type joint structure, the male side joint member protruded from the ring circumferential direction joint end face of one segment and the recess opened in the other joint end face The male joint member is inserted into the recess, and the segments are slid relative to each other in the ring axial direction so that the male and female joint members are engaged with each other. It is designed to be joined.

  The male joint member includes a frustoconical male fitting portion facing the reduced diameter side in the segment sliding direction, a male fitting portion that supports the male fitting portion on one end side, and a support portion that is fixed to the segment on the other end side. The female joint member is provided with a female side fitting portion having a frustoconical fitting hole whose inner diameter is gradually reduced in the segment sliding direction, and the male side fitting is performed as the segment slides. Part is inserted into the fitting hole, and the male side fitting part is fitted to the female side fitting part in a wedge shape so that both joint members are engaged, whereby both segments are joined. .

JP 2004-324104 A

  However, in the conventional joint structure as described above, since the fastening force between the two joint members is obtained by fitting the male side fitting portion and the fitting hole formed in a truncated cone shape, it is high in manufacturing the joint member. Accuracy is required, and the installation position of each joint member with respect to the segment must be accurately determined.Therefore, there is a problem that the production cost of the segment increases, and the joint strength in the ring circumferential direction of both segments is Since it depends on the fitting strength between the male-side fitting portion and the female-side fitting portion, there is a problem that the shape of both fitting portions becomes large and the weight increases.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a joint structure of a segment that can reduce the size and weight of both male and female joint members and reduce costs.

The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving the intended purpose is between the segments that are joined in the ring circumferential direction to form an annular segment ring, and A male joint member having a male fitting portion that protrudes from the joint end face of one segment to the ring circumferential direction side, and a female fitting fitted in a recess opened in the joint joint end face of the other segment A female joint member having a portion, wherein the male fitting portion is inserted into the concave portion, and the segments are slid relative to each other in the ring axis direction so that the male fitting portion is moved to the female side. In the joint structure of segments in which the segments are joined by being fitted to each other with the fitting portion, the thickness increases as the male side fitting portion advances in one or both of the upper and lower outer surface portions in the segment slide direction. Decrease The upper and lower inner side surfaces facing each other so that the male side fitting portion is fitted in a wedge shape to the female side fitting portion as they move in the segment slide direction. A fitting groove which is inclined so as to be close to each other, and the outer side surface portion of the male side fitting portion and the inner side surface portion of the fitting groove are respectively engaged with each other in the ring circumferential direction of the male and female side joint members. A plurality of locking teeth that regulate movement are provided in a saw blade shape, the locking teeth on the male side and the locking teeth on the female side are arranged with the segment slide direction side inclined toward the female joint member side, and In addition, the inner side surface portion of the fitting groove includes a guide groove in which the female side locking teeth are formed in parallel with each other across a flat portion, and the male side locking teeth are provided in the guide groove. It is to be inserted .

  As described above, the segment joint structure according to the present invention is located between the segments that are joined in the ring circumferential direction to form an annular segment ring, and protrudes toward the ring circumferential direction side from the joint end face of one segment. A male side fitting member having a male side fitting part, and a female side fitting member having a female side fitting part arranged in a recess opened in the joint end surface of the other segment. The joint is inserted into the recess, and the segments are joined by sliding the two segments relative to each other in the ring axis direction and fitting the male side fitting part with the female side fitting part. In the joint structure of a segment, the male side fitting portion has a trapezoidal section in which one or both of the upper and lower outer surface portions are inclined so as to decrease in thickness as it advances in the segment sliding direction. And the upper and lower inner side surfaces facing each other are inclined so as to approach each other in the segment slide direction so that the male side fitting portion is fitted in a wedge shape in the female side fitting portion. By providing the grooves, alignment in the segment thickness direction can be easily performed.

  Further, in the present invention, the outer side surface portion of the male side fitting portion and the inner side surface portion of the fitting groove are engaged with each other to restrict the movement of the male and female side joint members in the ring circumferential direction. Since the teeth are provided in a saw blade shape, the retaining strength in the circumferential direction of the ring can be distributed to a plurality of locking teeth, which makes it possible to reduce the size and is high for processing both male and female joint members. Since accuracy is not required, cost can be reduced.

  Further, in the present invention, the locking teeth are arranged by tilting the segment slide direction side toward the female joint member side, so that both the segments are slid relative to each other in the ring axial direction, so that both the joint members can be moved. The joint end surfaces of both segments can be easily abutted by being guided.

It is a top view which shows an example of the segment using the joint structure of the segment which concerns on this invention. (A) is a longitudinal cross-sectional view which shows the joint structure part of the segment based on this invention in FIG. 1, (b) is an AA sectional view. (A) is a top view which shows the male side coupling member part in FIG. 2, (b) is the side view, (c) is the BB sectional drawing. (A) is the longitudinal cross-sectional view which shows the female side coupling member part in FIG. 2, (b) is the side view, (c) is the CC sectional view taken on the line. It is a figure which shows the state between both male-female side locking teeth, (a) is a longitudinal cross-sectional view which shows the state at the time of a slide movement, (b) is a fitting state.

  Next, an embodiment of the joint structure of a segment according to the present invention will be described based on the examples shown in FIGS. In the figure, reference numeral 1 is a segment formed in a circular arc shape from concrete, and a plurality of segments 1, 1... Are connected to each other with their joint end faces 2a and 2b facing each other in the ring circumferential direction. Thus, an annular segment ring can be assembled.

  The joint structure for joining the segments 1 and 1 includes a male joint member 3 projecting from the joint end face 2a of one segment 1 toward the ring circumferential direction and a joint end face 2b of the other segment 1. A female joint member 5 disposed in the open recess 4, the male joint member 3 is inserted into the recess 4, and the joint end faces 2 a and 2 b are brought into contact with each other, and in this state both segments 1 and 1 are slid relative to each other in the ring axis direction so that the male joint member 3 and the female joint member 5 are engaged with each other, thereby joining the segments 1 and 1 together.

  As shown in FIG. 3, the male side joint member 3 is integrally provided with a lithographic anchor plate portion 10 and a male side joint member main body portion 11 having a shape raised in the vertical direction from the surface of the anchor plate portion 10. It is cast with ductile cast iron, the anchor plate portion 10 side is embedded in the circumferential end portion of the segment 1, and the tip end side projects from the joining portion end surface 2 a of the segment 1 in the ring circumferential direction.

  In the figure, reference numeral 10a is a reinforcing bar embedded in the segment 1, and this reinforcing bar 10a is connected to the anchor plate portion 10 by welding or the like as necessary in consideration of the bonding strength and the like. Yes.

  The male joint member main body 11 is formed in a plate shape integrally provided with the male fitting portion 13 continuously on the front end side in the ring circumferential direction of the support portion 12 having a shape raised from the center of the anchor plate portion 10. The plate width direction is directed to the ring axis direction.

  As shown in FIG. 3 (c), the male fitting portion 13 is formed in a trapezoidal cross section that is inclined so that the thickness decreases as one or both of the upper and lower outer surface portions 14, 14 progress in the segment slide direction. A plurality of male locking teeth 15, 15 are arranged in a saw blade shape in the circumferential direction of the ring on both the upper and lower outer surface portions 14, 14.

  Each male side locking tooth 15, 15 is formed in a triangular cross section with a locking surface portion 15 a with the surface facing the anchor plate portion 10 side and an inclined surface portion 14 b gently inclined toward the female side joint member 5 side. In addition, the triangular cross section is formed in a shape that continues in a linear direction that is inclined along the inclination of the outer surface and the segment slide direction side approaches the female joint member side.

  In addition, the male locking teeth 15 and 15 are formed in a continuous arrangement so that the locking surface portion 15a rises from the tip of the inclined surface portion 15b in parallel with each other, and the saw blade is arranged in an inclined manner with respect to the plate width direction. It has a shape.

  On the other hand, as shown in FIG. 4, the female-side joint member 5 includes a female plate supported by an anchor plate portion 20 embedded in a segment and a support portion 21 having a shape raised vertically from the surface of the anchor plate portion 20. The side fitting portion 22 is cast by ductile cast iron, the female side fitting portion 22 is shifted to the segment slide direction side in the concave portion 4 formed at the joining end portion of the segment 1, and the end face portion 22a is formed. It arrange | positions so that the junction end surface 2b of the segment 1 may be exposed.

  In the figure, reference numeral 20a denotes a reinforcing bar embedded in the segment 1, and this reinforcing bar 20a is connected to the anchor plate portion 20 by welding or the like as necessary in consideration of the bonding strength and the like. .

  The female-side fitting portion 22 has a rectangular groove shape that is open at both end surfaces in the ring axis direction and is inclined so that the upper and lower inner side surface portions 23 and 23 that face each other approach each other as they proceed in the segment slide direction. A fitting groove 24 is provided, and one end 24a in the ring circumferential direction of the fitting groove 24 is opened to the end surface portion 22a.

  The fitting groove 24 has a depth in the ring axis direction that is longer than the width in the ring axis direction of the male fitting portion 13, and the inclination angle of the inner side surface portions 23, 23 is the inclination angle of the outer side portion of the male fitting portion. Furthermore, when the male side fitting part 13 is inserted, it is formed so that the male side fitting part 13 is fitted in a wedge shape at a substantially central position in the ring axis direction. .

  A plurality of female locking teeth 25, 25... Are arranged in a saw-tooth arrangement on the upper and lower inner side surface portions 23, 23 of the fitting groove 24, and the female locking teeth 25, 25 are male. By engaging with the locking teeth 15, 15, movement of the male joint member relative to the female joint member in the ring circumferential direction is restricted.

  The female-side locking teeth 25 are formed in a triangular cross-section composed of a locking surface portion 25a whose surface is directed to the anchor plate portion 20 side, and an inclined surface portion 25b that is gently inclined to the male-side joint member 5 side. The triangular cross-section is formed in a shape that continues along the slope of the inner surface 24 and continues in a linear direction that is inclined so that the segment slide direction side approaches the anchor plate portion 20 side.

  Each female side locking tooth 25 is formed in an arrangement arranged in parallel with each other across the flat portion 26, and the guide groove into which the male side locking tooth 15 is inserted between each female side locking tooth 25, 25. 27, 27 ... are formed.

  In order to join the segments 1 and 1 adjacent in the ring circumferential direction by the joint structure of the segment configured as described above, first, the male side fitting portion 13 of the male side joint member 3 is inserted into the recess 4, The joint end faces 2a and 2b of the segments adjacent to each other in the ring circumferential direction are set to be abutted.

  Next, the segments 1 and 1 are relatively slid in the ring axis direction, and the male side fitting portion 13 is inserted into the fitting groove 24 of the female side fitting portion 22 in conjunction with the sliding movement. At the same time, the male locking teeth 15 and 15 are inserted into the guide grooves 27 and 27.

  At the slide start position in the ring axis direction, as shown in FIG. 5A, a gap is formed between the end portion on the sliding direction side of the male side fitting portion 13 and the inner side surface portion on the inlet side of the fitting groove 24. Thus, the male locking teeth 15 and 15 can be inserted with a margin in the guide groove 27, that is, between the female locking teeth 25 and 25, without accurate positioning.

  The outer side surfaces 14 and 14 of the male side fitting portion 13 are guided to the inner side surface portions 23 and 23 of the fitting groove 24, and the male side locking teeth 15 and 15 are guided to the guide grooves 27 and 27 while both segments are guided. 1, 1 and 1 are relatively slid, so that the outer side surface of the male fitting portion 13 and the inner side surfaces 23 of the fitting groove 24 approach each other as they move in the sliding direction, That is, the male-side fitting portion 13 is fitted in the fitting groove 24 in a wedge shape at a substantially central portion of the fitting groove 24 in the ring axis direction, and is inclined toward the female-side joint member 5 as it advances in the sliding direction. The joint end faces 2a and 2b that are guided by the arranged male and female side locking teeth 15 and 25 are close to each other and are brought into pressure contact at a predetermined position to be positioned in the ring circumferential direction.

  In a state where the male side fitting portion 13 is fitted in a wedge shape at the center portion of the fitting groove 24, as shown in FIG. 5 (b), the locking surface portion 15a of the male side locking teeth 15 and 15 and the female side locking portion 15a. The engaging surfaces 25a of the side engaging teeth 25 are engaged with each other so as to be in pressure contact with each other, thereby restricting movement in the ring circumferential direction between the male and female joint members 3 and 5, and both joint members 3 , 5 is distributed to the respective locking teeth 15 and 25 in the circumferential direction of the ring.

DESCRIPTION OF SYMBOLS 1 Segment 2 Joint end surface 3 Male side coupling member 4 Recessed part 5 Female side coupling member 10 Anchor plate part 11 Male side joint main body part 12 Support part 13 Male side fitting part 14 Outer side surface part 15 Male side locking tooth 20 Anchor plate part 21 Support portion 22 Female side fitting portion 23 Inner side surface portion 24 Fitting groove 25 Female side locking tooth 26 Flat portion 27 Guide groove

Claims (1)

A male joint member having a male side fitting portion between the segments that are joined in the circumferential direction of the ring to form an annular segment ring and projecting from the joint end face of one segment toward the circumferential side of the ring; A female-side joint member having a female-side fitting portion disposed in a concave portion opened in the joint end surface of the segment, the male-side fitting portion being inserted into the concave portion, and the two segments being a ring In the joint structure of the segments, the segments are joined together by sliding relative to each other in the axial direction and fitting the male side fitting portion with the female side fitting portion.
The male side fitting portion is formed in a trapezoidal cross-sectional shape in which one or both of the upper and lower outer side surface portions are inclined so as to decrease in thickness as it advances in the segment slide direction, and the male side fitting portion is provided with the male side fitting portion. The upper and lower inner side surface portions facing each other so as to be fitted in a wedge shape are provided with fitting grooves that are inclined so as to approach each other as they advance in the segment slide direction,
A plurality of locking teeth that engage with each other and restrict movement of the male and female joint members in the ring circumferential direction are saw-toothed on the outer side surface portion of the male side fitting portion and the inner side surface portion of the fitting groove. Prepared,
The male side locking teeth and the female side locking teeth are arranged with the segment slide direction side inclined toward the female joint member side,
In addition, a guide groove is formed on the inner side surface portion of the fitting groove in which the female side locking teeth are arranged in parallel with each other across a flat portion, and the male side locking teeth are provided in the guide groove. A segment joint structure characterized in that is inserted .

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