JP6347392B2 - 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 the ring circumferential direction joints of each segment has been generally joined by bolts, but in recent years, positioning between the two segments to be joined and fastening of both segments by the joint are performed. A so-called one-pass segment joint that can be performed simultaneously is widely used, and a hook-type joint is known as one of them (see, for example, Patent Document 1).

  Such a hook-type joint includes a hook-shaped male joint member projecting from the joining end face of one segment joined in the circumferential direction, and a female joint member disposed in a recess opened in the other joining end face. The male and male joint members are engaged with each other by joining the male and female joint members by inserting the male joint member into the recess and sliding the segments relative to each other in the segment width direction.

  The male joint member is integrally formed with a rod-like male support base protruding from the joint end face of one segment and a male engagement flange extending forward from the male support base in the sliding direction. The female joint member includes an outer shell portion formed in a box shape and a female side engaging portion disposed on the joint end surface side of the outer shell portion. The joint portion is inserted inside the female side engaging portion, whereby the male side engaging flange portion is engaged with the female side engaging portion.

  As other segment joints of other one-pass systems, cotter joints using a wedge structure (see, for example, Patent Document 2) and cone joints are also known.

Japanese Patent Application Laid-Open No. 11-256995 JP 2004-324104 A

  However, the conventional hook-type joint as described above has a structure in which the male-side engagement flange portion is inserted into and engaged with the female-side engagement portion to join the two segments. However, if there is no allowance (play) between the male-side engaging collar and female-side engaging portion in the state where the two are abutted, both segments cannot move relative to each other, resulting in poor work efficiency. When a margin (play) is provided between the engaging portions, there is a problem that the fastening strength between the male and female joint members cannot be secured.

  Further, in such a hook-type joint, since the male side engaging flange part that engages with the female side engaging part is supported by the male side supporting base part protruding from the joining end face in a cantilever shape, When a circumferential tensile force acts between the segments, the male engagement flange receives a reaction force from the female engagement portion and a bending stress is generated in the male joint member, ensuring high fastening strength between the segments. Therefore, high bending resistance is required.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing an inexpensive segment joint having high workability during assembly and having high fastening force and tensile strength.

In order to solve the conventional problems as described above and achieve the intended object, the feature of the invention described in claim 1 is that a male joint member protruding from a joining end face of one segment joined to each other, and the other A female joint member disposed in a recess opened in the joint end surface of the segment, inserting the male joint member into the recess, and relatively sliding the segments in the segment width direction. In the joint structure of a segment in which the male joint member and the female joint member are engaged with each other and the segments are joined to each other, the male joint member is a male base portion protruding from the one joining end surface And a male-side engaging collar that is supported at the base end of the male base and extends to the back side in the sliding direction, and the female joint member includes an outer shell portion that is fixed in the recess. , On the joint end face side of the outer shell A fixed engagement base, is disposed in the segment circumferentially inward of the engaging base, a resilient engaging member that urges the male-side engaging hook portion is supported by the engaging base, from the elastic engagement member A reinforcing engagement portion supported by the engagement base portion or the outer shell portion along with the elastic engagement body is provided on the front side in the slide movement direction of the male side engagement flange portion, and the male side engagement flange portion is the engagement member. By inserting the elastic engagement body supported by the combined base portion in the circumferential direction of the segment, the male engagement flange and the elastic engagement body are engaged and the segments are joined. The joint of the segment in which the base part of the male side engaging flange moved against the elasticity of the elastic engagement body when the tensile force of a certain level or more in the circumferential direction of the segment abuts against the reinforcing engagement part In the structure.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the male side engaging flange is fixed to both sides or one side in the segment thickness direction of the male flange base portion, and the reinforcement The engaging portion is arranged in front of the sliding movement of the male side engaging collar and parallel to the male base.

The segment joint structure according to the present invention includes a male joint member projecting from the joint end face of one segment joined to each other, and a female joint member disposed in a recess opened to the joint end face of the other segment. The male joint member is inserted into the recess, and the segments are slid relative to each other in the segment width direction so that the male joint member and the female joint member are engaged with each other, and the segment is In the joint structure of segments to be joined, the male joint member includes a male base part protruding from the one joint end surface, and a base end supported by the male base part, extending to the back side in the sliding direction. The female joint member includes an outer shell portion fixed in the concave portion, an engagement base portion fixed on the joining end surface side of the outer shell portion, and the engagement member. Around the base segment Disposed inside, elastic engagement with the elastic engagement body that urges the male-side engaging hook portion is supported by the engaging base, the sliding movement direction front side of the male-side engaging hook portion from the elastic engagement member And a reinforcing engagement portion supported by the engagement base portion or the outer shell portion alongside the union, and the male engagement flange portion is located on the inner side in the segment circumferential direction of the elastic engagement body supported by the engagement base portion By being inserted, the male engagement flange and the elastic engagement body are engaged to join the segments, and when a certain tensile force is applied between the segments in the circumferential direction of the segments, the elastic engagement is achieved. Since the base part of the male side engaging flange that has moved against the elasticity of the union is in contact with the reinforcing engaging part, the joining operation can be performed easily and efficiently, and the male joint member can be deformed. Can prevent high fastening force between segments .

  Further, in the present invention, the male engagement flange is fixed at both ends or one surface of the male flange base portion in the segment thickness direction, and the reinforcing engagement portion is the male engagement flange of the male engagement flange. By being arranged in front of the slide and parallel to the male base, the rotational moment can be suppressed, the deformation of the male engagement member can be prevented, and a high fastening force can be maintained.

It is a top view which shows an example of the segment using the joint structure of the segment which concerns on this invention. It is a cross-sectional view which shows the joint structure part of the segment which concerns on this invention in FIG. It is an AA line sectional view same as the above. (A) is a top view which shows a male joint member part, (b) is the same BB line arrow directional view. (A) is a longitudinal cross-sectional view which shows a female joint member part, (b) is the CC sectional view taken on the line. It is a longitudinal cross-sectional view which shows the other Example of the joint structure of the segment based on this invention. It is a cross-sectional view same as the above.

  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 denotes a segment formed in a circular arc shape from concrete, and a plurality of segments 1 and 1 are annularly formed by connecting the joining end faces 2a and 2b facing each other in the circumferential direction of the segment. The segment 1,1 ring is assembled.

  In this embodiment, with the segment ring to be assembled as a reference, the circumferential direction is the segment circumferential direction, the segment ring axial direction is the segment width direction, and the segment ring radial direction is the segment thickness direction. The movement of the male joint member in the sliding movement will be described as appropriate.

  The joint structure for joining the segments 1 and 1 includes a male joint member 3 projecting from the joint end surface 2a of one segment 1 in the circumferential direction of the segment and a recess opened in the joint end surface 2b of the segment 1 on the other side. 4 and a female joint member 5 disposed within the male joint member 3 with the segments 1, 1 being displaced in the segment width direction and inserting the male joint member 3 into the recess 4 so that the joint end faces 2a, 2b are butted together. In this state, the segments 1, 1 are slid relative to each other in the segment width direction so that the male joint member 3 and the female joint member 5 are engaged with each other, thereby joining the segments 1, 1. .

  As shown in FIG. 4, the male joint member 3 includes a male base 6 projecting from one of the circumferential joining end faces 2 a of the segment 1, and a slide movement side in the segment width direction from the tip of the male base 6. The male side engagement collar part 7 extended toward the surface is provided, and the male side flange part 6 and the male side engagement collar part 7 form an L-shaped hook shape.

  The male base 6 is formed in the shape of a square bar, one end is embedded in the circumferential end of the segment 1, and the other end protrudes from the one joining end face 2 a in the segment circumferential direction. In the figure, reference numeral 8 denotes a reinforcing bar 8 embedded in the segment 1, and this reinforcing bar 8 is connected to the male base 6 by welding or the like as necessary in consideration of bonding strength and the like. It has become.

  The male-side engaging collar portion 7 is formed in a square bar shape having a certain length in the segment width direction, and is integrally supported at the distal end of the male collar base portion 6 to form a cantilever shape.

  The male engagement flange 7 is formed with a tapered portion 7a inclined in the segment width direction on the outer peripheral surface on the distal end side in the segment circumferential direction, and the segment circumferential width of the male engagement flange 7 is the back side in the sliding direction. It gets narrower as you go.

  As shown in FIG. 5, the female joint member 5 includes an outer shell portion 10 fixed in the recess 4, an engagement base portion 11 fixed to the joint end surface 2 b side of the outer shell portion 10, and the engagement base portion 11. The elastic engagement body 12 is arranged on the inner side in the circumferential direction, and the reinforcement engagement portion 13 is fixed to the engagement base portion 11 along the slide movement front side of the elastic engagement body 12. The engagement base portion 11, the elastic engagement body 12 and the reinforcing engagement portion 13 are accommodated in the outer shell portion 10.

  The concave portion 4 opens in one joining end surface 2b of the segment 1 and is formed in an elongated hole shape that is long in the segment width direction. The concave portion 4 is shifted to the back side in the segment width direction, that is, the back side of the slide movement. The outer shell portion 10 of the female joint member 5 is embedded.

  The outer shell 10 has a U-shaped cross section in which a pair of side wall portions 14a and 14a facing each other at a distance in the segment thickness direction are connected by an arc portion 14b, and both ends in the segment width direction and the joint end surface 2b side in the segment circumferential direction are opened. The outer shell part main body 14 which comprises a box shape, and the end plate 15 which closes the opening of the segment width direction slide back | inner side of the outer shell part main body 14 are provided.

  The engagement base 11 is formed in a rectangular plate shape with a steel plate or the like, and is fixed to the inner edge of the outer end of the outer shell portion 14 on the joint end surface 2b side in the segment circumferential direction by welding or the like. Is closed.

  The elastic engagement body 12 includes an elastic body 16 made of rubber or the like fixed to the inner circumferential surface of the engagement base 11, and an engagement main body 17 fixed in an overlapping arrangement on the inner side in the circumferential direction of the elastic body 16. By pressing the surface of the engagement body 17, the elastic body 16 is elastically deformed so as to be compressed in the segment circumferential direction.

  The engagement main body 17 is formed in a flat plate shape with a steel plate or the like, and a tapered insertion guide portion 17a inclined toward the front side in the slide movement direction is formed at an end portion thereof.

  The reinforcing engagement portion 13 is formed in a rectangular plate shape with a rigid steel plate or the like, and is fixed to the side wall portions 14a and 14a of the outer shell main body 14 and the inner side surface of the engagement base portion 11 by welding or the like. The elastic engagement body 12 is accommodated between the reinforcing engagement portion 13 and the end plate 15.

  The reinforcing engagement portion 13 has a segment circumferential length L2 from the joint end surface 2b of one of the segments 1 to be joined to each other from the joint end surface 2a of the segment 1 of the male side engagement flange portion 7 of the male joint member 3. It is formed to be slightly shorter than the distance L1.

  In order to join the segments 1 and 1 adjacent in the circumferential direction of the segment by the joint structure of the segment thus configured, first, the male joint is inserted into the recess 4 with both the segments 1 and 1 being displaced in the segment width direction. The member 3 is inserted, and the joining end faces 2a and 2b of the segments 1 and 1 that are adjacent to each other in the circumferential direction of the segment are set to face each other.

  Next, when both the segments 1 and 1 are slid relative to each other in the segment width direction, the male-side engagement collar portion 7 is inserted into the inner side in the circumferential direction of the elastic engagement body 12 supported by the engagement base portion 11. The side engagement collar 7 and the elastic engagement body 12 are engaged, and the elastic engagement body 12 is supported by the engagement base 11 to urge the male side engagement collar 7 in the segment circumferential direction. 1 is joined by joining its end faces 2a and 2b.

  At that time, since the male engagement flange 7 is urged by the elastic engagement body 12 supported by the engagement base 11, as shown in FIG. 2 and FIG. , 2b are in abutment with each other, the male engagement flange 7 and the reinforcing engagement portion 13 are not in contact with each other and are not subjected to reaction force with each other. However, there is a slight margin d against the elastic engagement body 12 while a sufficient fastening force acts, and the slide can be efficiently slid to a desired position.

  In the joint structure of the segment configured as described above, the male-side engagement flange portion 7 is engaged with the elastically-deformable elastic engagement body 12, whereby both the segments 1 and 1 are relatively slid to move. The insertion resistance at the time of engaging 3 and 5 can be reduced, and the fastening operation | work of both the segments 1 and 1 can be performed efficiently.

  On the other hand, in the joint structure of this segment, when a tensile force of a certain level or more, that is, a large force exceeding the pressing force of the elastic engagement body 12 is applied in the circumferential direction of the segment, the male engagement flange portion 7 is accordingly moved to the elastic engagement body. 12, the base side portion abuts against the reinforcing engagement portion 13, and the male side engagement flange portion 7 is in addition to the urging force of the elastic engagement body 12 supported by the engagement base portion 11. A reaction force from the reinforcing engagement portion 13 acts.

  Therefore, in a normal time, the fastening force between the segments 1 and 1 is obtained by the pressing force (spring pressure) of the elastic engagement body 12 supported by the engagement base 11, and the segments 1 and 1 are separated in the circumferential direction of the segment. When a tensile force of a certain level or more is applied, the male side engagement flange 7 abuts on the reinforcing engagement portion 13 and can counter the tensile force.

  Moreover, in the joint structure of the segment comprised in this way, by arrange | positioning the reinforcement engaging part 13 in the segment width direction slide front side of the elastic engagement body 12, the spring pressure of the elastic engagement body 12 between the segments 1 and 1 is provided. When a larger tensile force is applied, the root portion of the male side engagement flange portion 7 comes into contact with the reinforcing engagement portion 13, whereby the point of action of the tensile force is shifted to the reinforcing engagement portion 13 side, and the action of the tensile force is applied. The distance between the point and the base end portion of the male engagement flange 7 is shortened.

  Therefore, as the distance between the point of application of the tensile force and the base end portion of the male engagement flange 7 is shortened, the bending strength of the male engagement flange 7 is improved, and the circumferential direction between both segments 1 and 1 is improved. Even if a large tensile force is generated, the male joint member is prevented from being deformed and a high fastening force can be maintained.

  In addition, the aspect of the male coupling member 20 is not limited to the above-mentioned Example, For example, what is shown to the Example shown in FIG. 6, FIG. 7 may be used. In addition, the same code | symbol is attached | subjected to the structure similar to the above-mentioned Example, and description is abbreviate | omitted.

  The male joint member 20 has a plate-like male base portion 21 with the surface protruding from the joint end surface 2a of one segment 1 to be joined in the segment thickness direction, and both sides of the male base portion 21 in the segment thickness direction. It has a pair of male side engaging flanges 22 and 22 to which a base end part was fixed.

  In the female joint member 23 with respect to the male joint member 20, the pair of reinforcement engaging portions 24, 24 are fixed to the front side edge portion of the engagement base portion 11 at a distance from each other in the segment thickness direction. The male base part 21 is inserted between the joint parts 24 and 24, and is arranged in front of the male side engaging base parts 22 and 22 and in parallel with the male base part 21.

  In this female joint member 23, an arc spring-like elastic engagement body 25 is used, and the male side engagement flanges 22 and 22 are inserted and engaged with the bulging side of the elastic engagement body 25. ing.

  In the joint structure of the segment configured as described above, the reinforcing engagement portions 24 and 24 overlap the male base portion 21 in the segment thickness direction, and the rotational moment due to the reaction force from the reinforcing engagement portions 24 and 24 does not act. Therefore, high tensile strength can be ensured accordingly.

  Further, in the above-described embodiment, the example in which the elastic engagement body is configured with the elastic body made of rubber or the like and the engagement main body made of steel material has been described, but the mode of the elastic engagement body is not limited thereto, for example, It may be formed in an arc spring shape.

DESCRIPTION OF SYMBOLS 1 Segment 2a, 2b Joining end surface 3 Male joint member 4 Recessed part 5 Female joint member 6 Male flange base part 7 Male side engagement collar part 8 Reinforcing bar 10 Engagement base part 11 Elastic engagement body 12 Reinforcement engagement part 13 Outer shell part 14 Outer Shell body 15 End plate 16 Elastic body 17 Engagement body 20 Male joint member 21 Male flange base part 22 Male side engagement collar part 23 Female joint member 24 Reinforcement engagement part

Claims (2)

A male joint member projecting from the joining end surface of one of the segments to be joined together, and a female joint member disposed in a recess opened to the joining end surface of the other segment; A segment joint structure in which the male joint member and the female joint member are engaged with each other and inserted between the segments by inserting and relatively sliding the segments in the segment width direction. In
The male joint member includes a male base part that protrudes from the one joint end surface, and a male side engagement flange part that is supported by the male base part and extends to the back side in the sliding direction,
The female joint member includes an outer shell portion fixed in the recess, an engagement base portion fixed to the joining end surface side of the outer shell portion, and a segment circumferential inner side of the engagement base portion, An elastic engagement body supported by an engagement base and urging the male side engagement flange; and the engagement side by side with the elastic engagement body on the front side in the sliding direction of the male side engagement flange from the elastic engagement body. A reinforcing engagement part supported by the combined base part or the outer shell part,
By inserting the male side engagement collar part into the segment circumferential inner side of the elastic engagement body supported by the engagement base part, the male side engagement collar part and the elastic engagement body are engaged, and the When the segments are joined and a tensile force of a certain level or more acts between the segments in the circumferential direction of the segment, the base portion of the male side engaging flange moved against the elasticity of the elastic engaging body is the reinforcing engagement. A joint structure of a segment characterized by being in contact with a portion. The male side engagement flange is fixed to both sides or one side of the male flange base portion in the segment thickness direction, and the reinforcing engagement portion is positioned before the male side engagement flange and before the male movement. The joint structure of the segment of Claim 1 arrange | positioned in parallel with the collar part.

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