JP2011162987A - Segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment which is simple in structure and can secure a large strength against a shearing force. <P>SOLUTION: This segment 1 is used to form the outer shell of a tunnel by combining a plurality of segments. The segment includes a skin plate 2 forming the outer peripheral surface of the tunnel, inter-ring joint parts 3 vertically installed, in pairs, at both side edges of the skin plate at an interval in the axial direction of the tunnel, and inter-segment joint parts vertically installed, in pairs, at both end edges of the skin plate at an interval in the circumferential direction of the tunnel. A recess/projection fitting structure in which the surface contact of a projective surface 31a and a web surface 32a generally crossing each other in the joint direction is generated when the segment is joined to the other one installed adjacent thereto is formed at the inter-ring joint part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a segment used for a shield tunnel lining (outer shell).

  2. Description of the Related Art Conventionally, a method of assembling a cylindrical tunnel lining by joining a plurality of arcuate plate-shaped segments in the circumferential direction is known (see Patent Documents 1-4 and the like).

  The segments described in these patent documents are a thin steel plate skin plate which is arranged on the natural ground side and forms the outer peripheral surface of the tunnel, a steel frame surrounding the skin plate, a skin plate and a steel plate. And concrete filled into the inner space formed into a box shape by a frame material.

  On the other hand, the joint structure between segments causes water leakage inside the tunnel if there is no deviation between adjacent segments even when a large shearing force is applied to the tunnel lining due to a large earthquake. Or the lining may be damaged.

  In Patent Documents 1-4, a flange of a steel frame material is formed into a special shape in a joint in a circumferential direction of a tunnel (inter-segment joint) or a joint in an axial direction of a tunnel (inter-ring joint). A joint structure is disclosed in which a solidifying material such as mortar is injected into a rectangular parallelepiped gap formed between the joined flanges.

Japanese Patent No. 2566495 Japanese Patent No. 3302925 Japanese Patent No. 3343090 Japanese Patent No. 3373110

  However, in the joint structure disclosed in the conventional patent documents 1 to 4, since it is necessary to use a steel material processed into a special shape at the end of the segment, the manufacturing cost may increase.

  In addition, a step of injecting a solidifying material between the end surfaces of the segments is required, and the bonding by the solidifying material is not expressed unless a predetermined time has elapsed, and a waiting time is generated to ensure a predetermined strength. In some cases.

  Furthermore, Patent Document 1 discloses a structure in which a flange and a recess are provided and fitted to a flange because shearing force due to displacement is generated only by abutting the end faces of plate-like flanges, and causes cracking of concrete. Although the invention has been disclosed, it is still only contact within the plate thickness range of the plate-like flange.

  Accordingly, an object of the present invention is to provide a segment that has a simple structure and can ensure a large proof strength against a shearing force.

  In order to achieve the above object, a segment of the present invention is a segment that forms a tunnel outer shell by combining a plurality of segments, and a skin plate that forms the outer peripheral surface of the tunnel, and a distance in the axial direction of the tunnel. Between the joints between the rings that are erected as a pair on both side edges of the skin plate and between the segments that are erected as a pair at both edges of the skin plate with a spacing in the circumferential direction of the tunnel When joining with another segment installed adjacent to at least one of the joint part between rings or the joint part between segments, surface contact between surfaces substantially perpendicular to the joint direction is generated. The uneven | corrugated fitting structure to be formed is formed.

  Here, the concave-convex fitting structure includes a convex outer surface formed through a step on the inner peripheral surface side from the outer peripheral surface of the tunnel, a convex surface substantially orthogonal to the convex outer surface, and an outer peripheral surface side from the inner peripheral surface of the tunnel. Formed by a step having a convex inner surface, an outer flange surface in contact with the convex outer surface, a web surface in contact with the convex surface, and a concave portion having an inner flange surface in contact with the convex inner surface. It is preferable.

  Moreover, the said convex part may be formed with the steel material of cross-sectional view substantially U-shape, and the said recessed part may be formed of cross-sectional view substantially I-shape or cross-section view substantially H-shaped steel material. Furthermore, the protruding length of the inner flange surface in the joint direction can be made longer than the protruding length of the outer flange surface in the joint direction.

  Moreover, it is preferable to interpose a sealing material between the surfaces where the surface contact is generated. Furthermore, a tensile joint serving as a pull-out resistance can be provided in the joint portion where the uneven fitting structure is formed.

  The segment of the present invention configured as described above has an uneven fitting structure in which at least one of the inter-ring joint portion and the inter-segment joint portion generates surface contact between surfaces substantially orthogonal to the joint direction.

  For this reason, a joint can be easily performed only by fitting the unevenness | corrugation used as the pair of adjacent segments. Moreover, since it is an uneven | corrugated fitting structure where the surfaces contact each other, not in the range of the thickness of the plate-like member, it is possible to ensure a large proof strength against the shearing force.

  In addition, the concave / convex fitting structure in which the convex surface with a width obtained by subtracting the steps on both sides from the thickness of the segment and the web surface between the outer flange surface and the inner flange surface provides a wide and stable contact area. As a result, the yield strength against shearing force can be increased. Moreover, since positioning is performed by the concave and convex fitting, the joint can be performed with high accuracy.

  Furthermore, if the convex portion is formed of a steel material having a U-shaped cross-sectional view and the concave portion is formed of a steel material having a substantially I-shaped or substantially H-shaped cross-sectional view, a widely used steel material can be used and manufactured at low cost. it can.

  In addition, by increasing the protruding length of the inner flange surface, even in tunnels where internal water pressure acts, such as underground adjustment ponds and sewage pipes, the thickness of the segment is excessively increased against the desired shear strength. It can be secured without making it.

  Furthermore, high water-stopping performance can be ensured by interposing a sealing material between the surfaces where surface contact is generated.

  Also, by providing a tensile joint in addition to the concave / convex fitting structure, even if a tensile force is generated in the tunnel lining during an earthquake, for example, the adjacent segments will not be separated and the occurrence of water leakage will be prevented. Can do.

It is sectional drawing explaining the structure of the joint structure of the segment of embodiment of this invention. It is the perspective view seen partially from the inner peripheral surface side of the tunnel which fractured | ruptured partially in order to demonstrate the structure of a segment. It is the perspective view which looked at the segment from the outer peripheral surface side of the tunnel. It is the side view of the segment which looked at the joint part side between segments from the circumferential direction of the tunnel. It is a top view of the segment of the state which is not filled with the concrete seen by the AA arrow direction of FIG. It is sectional drawing of the segment of the state which is not filled with the concrete seen by the BB arrow direction of FIG. It is a figure explaining the structure of the segment of Example 1, Comprising: (a) is sectional drawing, (b) is an expanded sectional view explaining the structure of the joint part between rings. It is a figure explaining the structure of the segment of Example 2, Comprising: (a) is sectional drawing, (b) is an expanded sectional view explaining the structure of the joint part between rings. It is a figure explaining the structure of the segment of Example 3, Comprising: (a) is sectional drawing, (b) is an expanded sectional view explaining the structure of the joint part between rings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1-3 are a cross-sectional view and a perspective view illustrating the configuration of the segment 1 (1A, 1B) of the present embodiment. This segment 1 is an arc plate-like member, and a cylindrical lining (outer shell) of the tunnel is formed by combining a plurality of segments 1.

  Hereinafter, the direction in which the tunnel extends is referred to as the axial direction of the tunnel, the arc direction of the cylindrical tunnel is referred to as the circumferential direction of the tunnel, the ground side of the lining is referred to as the outer peripheral surface of the tunnel, and the inner side of the lining Is called the inner periphery of the tunnel.

  The segment 1 includes a skin plate 2 that forms a part of the outer peripheral surface of the tunnel, an inter-ring joint portion 3 that is erected in pairs on both side edges of the skin plate 2, and both end edges of the skin plate 2. The inter-segment joint portion 5 standing upright, a plurality of rib portions 21 extending in parallel to the inter-segment joint portion 5 on the surface of the skin plate 2, and the inner space are filled. It is a synthetic segment mainly comprising a concrete portion 4.

  The skin plate 2 is formed by bending a thin rectangular steel plate into a circular arc when viewed from the side. The skin plate 2 has a long side in the circumferential direction of the tunnel and a short side in the axial direction of the tunnel.

  Further, an arc-shaped inter-ring joint portion 3 is erected along the side edge which is the long side of the skin plate 2. As shown in FIG. 1, the inter-ring joint portion 3 forms a concave-convex fitting structure in which a convex portion 31 and a concave portion 32 are paired. That is, the convex portion 31 and the concave portion 32 are erected in parallel with an interval in the axial direction of the tunnel.

  As shown at the left end of FIG. 1, the convex portion 31 has an outer shape formed of a steel material having a substantially U-shaped cross-sectional view. That is, the convex portion 31 includes a convex surface 31a that is substantially orthogonal to the joint direction that is the axial direction of the tunnel, and a convex outer surface 31b and a convex inner surface 31c that are substantially orthogonal to the convex surface 31a at the upper and lower edges of the convex surface 31a. Have.

  The convex outer surface 31b is formed to be substantially parallel to the skin plate 2 by being lowered by one step from the outer peripheral surface of the tunnel to the inner peripheral surface side. Further, the convex inner surface 31c is formed one step higher than the inner peripheral surface of the tunnel to the outer peripheral surface side and is formed substantially parallel to the convex outer surface 31b.

  On the other hand, as shown at the right end of FIG. 1, the recess 32 has a substantially I-shaped steel material with an asymmetrical sectional view in which the protruding length of the segment 1 to the outside is longer than the length embedded in the inside. It is formed.

  The recess 32 includes a web surface 32a that is substantially orthogonal to the joint direction, which is the axial direction of the tunnel, and an outer flange surface 32b and an inner flange surface that are substantially orthogonal to the web surface 32a at the upper and lower edges of the web surface 32a. 32c.

  Such convex portions 31 and concave portions 32 can be manufactured by joining a plurality of strip-shaped steel plates by welding or the like. Moreover, it can also manufacture using steel materials, such as cross-sectional view U-shape, I shape, H shape, or L shape.

  As shown in FIG. 1, in the inter-ring joint portion 3 between the segments 1A and 1B adjacent in the axial direction of the tunnel, the three surfaces of the convex portion 31 (the convex surface 31a, the convex outer surface 31b, the convex inner surface 31c) and the concave portion 32 The three surfaces (web surface 32a, outer flange surface 32b, and inner flange surface 32c) are in contact with each other.

  Further, as shown in the center of FIG. 1, a sealing material 34 is interposed between the convex surface 31a and the web surface 32a. As the sealing material 34, rubber packing, a water-expandable sealing material, or the like can be used.

  Further, a tensile joint 33 is provided in the inter-ring joint portion 3. The tensile joint 33 is provided to prevent the segments 1A and 1B from being separated by a tensile force.

  The tensile joint 33 is composed of a press fitting 33b provided on one segment 1A side and a press fit receiving piece 33a provided on the other segment 1B side.

  Then, the segments 1A and 1B can be connected to each other in a one-touch manner simply by inserting the press-fit metal 33b into the press-fit metal 33a. The tensile joint 33 may be configured to be connected by a bolt and a nut portion.

  Moreover, if the press fitting 33b is formed of a steel rod or the like, in addition to the tensile force in the axial direction of the tunnel, it is possible to resist a shearing force perpendicular to the tunnel, for example, in the tunnel radial direction (inside and outside of the tunnel).

  On the other hand, as shown in FIG. 2-4, the inter-segment joint portion 5 is erected along the edge on the short side of the skin plate 2 so as to connect between the end portions of the convex portion 31 and the concave portion 32. The

  As shown in FIG. 4, the inter-segment joint 5 includes a joint plate 55 that forms a joint surface, an insertion fitting 51, and a receiving fitting that receives the insertion fitting 51 at a position where the adjacent segments 1 are opposed to each other. 52, a shear projection 53 fixed to the joint surface of the joint plate 55, and a seal material 54.

  The joint plate 55 is formed of, for example, a rectangular steel plate, and is joined to the end portions of the convex portion 31 and the concave portion 32 by welding or the like. Further, the shear projection 53 is formed by providing a groove in the joint plate 55 in the axial direction of the tunnel and fixing a round steel, a square steel, a reinforcing bar, or the like in the groove. Furthermore, as shown in FIG. 4, seal materials 54, 54 such as rubber packing are respectively attached to the tunnel outer peripheral surface side and the tunnel inner peripheral surface side of the two shearing protrusions 53, 53 provided in parallel. .

  In addition, the insertion fitting 51 and the receiving fitting 52 are attached to the fitting plate 55, for example, one by one, and the fitting plate 55 of another segment 1 to be connected in the circumferential direction is placed at a position facing the insertion fitting 51. 52 is attached, and an insertion fitting 51 is attached at a position facing the receiving fitting 52. Then, by inserting the insertion fitting 51 into the receiving fitting 52, the circumferential connection between the two segments 1 and 1 is performed.

  As shown in FIGS. 5 and 6, the insertion fitting 51 is provided integrally with the insertion portion 51 b that protrudes outside the segment 1 from the joint plate 55 and the insertion portion 51 b and extends inside the segment 1. And a fixing plate portion 51a.

  Further, as shown in FIGS. 5 and 6, the receiving metal fitting 52 is provided integrally with the housing portion 52 b that opens toward the outside of the segment 1 in the joint plate 55 and extends into the segment 1. And a fixing plate portion 52a provided.

  The insertion fitting 51 and the receiving fitting 52 can be manufactured by joining steel materials by welding. Moreover, you may shape | mold integrally as a casting.

  As shown in FIGS. 4 and 5, the joint plate 55 is provided with an insertion port 52c communicating with the receiving portion 52b of the receiving metal 52, and the insertion of the insertion metal 51 of the segment 1 connected to the insertion port 52c is inserted. When the part 51 b is inserted and the segment 1 is moved in the axial direction of the tunnel, the insertion fitting 51 is fitted into the receiving fitting 52.

  Further, as shown in FIGS. 5 and 6, the rib portion 21 is passed between the convex portion 31 and the concave portion 32 in parallel with the joint plate 55. A plurality of the rib portions 21 are erected at intervals in the circumferential direction of the tunnel.

  As shown in FIGS. 1 and 5, the rib portion 21 is formed of a rectangular steel plate, and the upper half near the center is cut so as to form a gate shape, and a communication hole 21 a is formed between the rib portion 21 and the skin plate 2. It is formed. By this communication hole 21a, concrete can be filled without being blocked by the rib portion 21.

  Furthermore, a spacer 42 protruding to the inner peripheral surface side of the tunnel is attached to the rib portion 21. The spacer 42 can be manufactured by forming a reinforcing bar into an L shape or a U shape. The spacer 42 is fixed by welding its leg part to the side surface of the rib part 21.

  On the spacer 42, reinforcing bars 41 are arranged in a lattice pattern as shown in FIG. The arrangement position of the reinforcing bars 41 in the lining thickness direction of the segment 1 is adjusted by the protruding amount of the spacer 42 toward the inner peripheral surface of the tunnel. For example, the arrangement position in the lining thickness direction of the segment 1 is different between the case where the reinforcing bar 41 is arranged as a crack preventing reinforcing bar and the case where the reinforcing bar 41 is arranged as a tensile reinforcing bar on the inner peripheral surface side of the tunnel. By adjusting the protrusion amount of the spacer 42, the reinforcing reinforcing bar 41 can be disposed and functioned at an accurate position.

  Further, as shown in FIG. 6, a cylindrical holding metal 11 is erected at the center of the segment 1. The gripping hardware 11 is used as a gripping part that is gripped by an erector apparatus or the like when the segment 1 is transported and installed.

  Further, the concrete portion 4 is a box-shaped space formed by the skin plate 2, the convex portion 31, the concave portion 32, and the joint plates 55, 55 standing on the edge thereof, and the position where the reinforcing steel bar 41 is buried. Formed by filling concrete.

  Moreover, the concrete part 4 can be shape | molded with the concrete with high fireproof performance in which synthetic resin fiber, such as a polypropylene fiber or a vinylon fiber, was mixed.

  Further, when filling concrete, the outer periphery of the segment 1 is surrounded by a rigid formwork device (not shown) so that distortion and deformation are not caused by the filling pressure of the concrete. Further, by providing the formwork apparatus with a vibrator, the concrete filling performance is improved, and the dense concrete portion 4 can be formed.

  Next, the operation of the segment 1 of the present embodiment will be described.

  The segment 1 of the present embodiment configured as described above includes the skin plate 2, the convex portion 31, the concave portion 32, and the joint plates 55 and 55 that are erected on the edge thereof, and extends on the surface of the skin plate 2. It is manufactured as a synthetic segment by the rib portion 21 to be formed and the concrete portion 4 filled in the space formed by these. Since such a synthetic segment can be easily designed to optimize the cross section of the steel material, the manufacturing cost of the segment 1 can be reduced.

  The inter-ring joint portion 3 of the segment 1 has an uneven fitting structure in which a convex surface 31a substantially orthogonal to the joint direction and a web surface 32a that is also substantially orthogonal to the joint direction are in surface contact.

  For this reason, a joint can be easily performed at an accurate position only by fitting the convex part 31 and the concave part 32 which become a pair of adjacent segments 1A and 1B. In addition, this uneven fitting structure is not an abutting in the range of the plate thickness of the plate-like member, but is an uneven fitting structure in which the convex surface 31a occupying most of the joint surface and the web surface 32a are in surface contact. High yield strength can be ensured against resistance.

  That is, if it is an uneven fitting structure in which the convex surface 31a having a width obtained by subtracting the steps on both sides from the thickness of the segment 1 and the web surface 32a between the outer flange surface 32b and the inner flange surface 32c are in surface contact, The contact structure has a wide and stable joint structure, and the resistance to shearing force can be increased.

  Further, by adding surface contact between the convex outer surface 31b and the outer flange surface 32b, and the convex inner surface 31c and the inner flange surface 32c, the stability can be further increased and the shear strength can be increased.

  Moreover, if the convex part 31 is formed with a steel material in a U-shaped cross-sectional view and the concave part 32 is formed with a steel material in a substantially I-shaped cross-sectional view, a widely used steel material can be used and can be manufactured at low cost.

  Furthermore, if the joint surface which may become a waterway is bent and lengthened by the concave-convex fitting structure, the water stopping performance is improved, and the sealing material 34 is interposed between the convex surface 31a and the web surface 32a. Higher water stopping performance can be ensured.

  Further, by providing the tensile joint 33 in addition to the concave-convex fitting structure, even if a tensile force is generated in the tunnel lining during an earthquake, for example, the adjacent segments 1 and 1 are not separated from each other, and water leakage occurs. Occurrence can be prevented.

  Hereinafter, Example 1 of a form different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the segment 7 described in the first embodiment, a concave-convex fitting structure is formed in the inter-ring joint portion 73 that becomes the joint portion in the axial direction of the tunnel. That is, as shown in FIG. 7A, a pair of convex portions 731 and concave portions 732 are formed on both side edges of the segment 7 in the tunnel axis direction, and adjacent segments 7A are formed as shown in FIG. 7B. , 7B, the convex portion 731 and the concave portion 732 are fitted to form a concave-convex fitting structure.

  As shown on the left side of FIG. 7A, the convex portion 731 is parallel to the outer plate 731d formed of a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 72 and the outer plate 731d. It is formed by passing a steel plate between the inner plate 731e and the inner plate 731e which is disposed in the middle and forms the inner peripheral surface of the segment 7.

  That is, the convex portion 731 is formed by attaching the steel plate so as to form a convex surface 731a that is substantially orthogonal to the outer plate 731d and the inner plate 731e and projects outward from the end surfaces thereof. A surface substantially orthogonal to the convex surface 731a on the outer peripheral surface side of the tunnel is a convex outer surface 731b, and a surface substantially orthogonal to the convex surface 731a on the inner peripheral surface side of the tunnel is a convex inner surface 731c.

  The convex outer surface 731b is formed to be substantially parallel to the skin plate 72, one step down from the outer peripheral surface of the tunnel to the inner peripheral surface side. In addition, the convex inner surface 731c is formed one step up from the inner peripheral surface of the tunnel to the outer peripheral surface side and is formed substantially parallel to the convex outer surface 731b.

  On the other hand, as shown on the right side of FIG. 7A, the recess 732 is parallel to the outer plate 732d formed of a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 72 and the outer plate 732d. Is formed by passing a steel plate between the inner plate 732e and the inner plate 732e which forms the inner peripheral surface of the segment 7.

  That is, the concave portion 732 is formed by attaching the steel plate so as to form a web surface 732a that is substantially orthogonal to the outer plate 732d and the inner plate 732e and that is recessed inwardly from the end surfaces thereof. The lower surface of the outer plate 732d protruding outward from the web surface 732a on the outer peripheral surface side of the tunnel becomes the outer flange surface 732b, and the upper surface of the inner plate 732e protruding outward from the web surface 732a on the inner peripheral surface side of the tunnel. Becomes the inner flange surface 732c.

  When the convex portion 731 and the concave portion 732 configured in this manner are fitted together, as shown in FIG. 7B, the ring-to-ring joint portion 73 between the segments 7A and 7B adjacent in the tunnel axis direction The three surfaces (convex surface 731a, convex outer surface 731b, convex inner surface 731c) and the three surfaces of the recess 732 (web surface 732a, outer flange surface 732b, inner flange surface 732c) come into contact with each other.

  Further, a recess extending in the circumferential direction of the tunnel is provided in each of the convex surface 731a and the web surface 732a, and the sealing material 34 is interposed in the recess as shown in FIG. 7B.

  Furthermore, in Example 1, the end surface of the outer plate 731d and the end surface of the outer plate 732d are abutted on the outer peripheral surface side of the tunnel in which the unevenness is fitted. In addition, the end surface of the inner plate 731e and the end surface of the inner plate 732e are abutted on the inner peripheral surface side of the tunnel in the uneven fitting.

  The segment 7 of Example 1 configured in this way has surface contact even at the top and bottom of the concave-convex fitting structure, so that the contact area is wide and the joint structure is stable, and the yield strength against shearing force can be increased. .

  Moreover, since the protrusion amount of the convex part 731 is a small amount smaller than the plate | board thickness of the steel plate which forms the convex surface 731a, it is easy to fit in the recessed part 732, and can perform a connection operation | work rapidly.

  Further, by interposing a plurality of sealing materials 34, 34 between the convex surface 731a and the web surface 732a, high water stop performance can be ensured.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, Example 2 of a form different from the above-described embodiment and Example 1 will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment or Example 1 will be given the same reference numerals.

  In the segment 8 described in the second embodiment, a concave-convex fitting structure is formed in the inter-ring joint portion 83 that becomes the joint portion in the axial direction of the tunnel. That is, as shown in FIG. 8A, a pair of convex portions 831 and concave portions 832 are formed on both side edges of the segment 8 in the tunnel axis direction, and adjacent segments 8A are formed as shown in FIG. 8B. , 8B, the convex portion 831 and the concave portion 832 are fitted to form a concave-convex fitting structure.

  As shown on the left side of FIG. 8A, the convex portion 831 is substantially orthogonal to the outer plate 831d from the lower surface of the outer plate 831d formed by a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 82. In this way, the steel plate is formed to hang down.

  That is, the convex portion 831 is formed by attaching the steel plate so that the convex surface 831a protruding outward from the end surface of the outer plate 831d is formed. A surface substantially orthogonal to the convex surface 831a on the outer peripheral surface side of the tunnel is a convex outer surface 831b, and a surface substantially orthogonal to the convex surface 831a on the inner peripheral surface side of the tunnel is a convex inner surface 831c. Further, a notch 831e is provided toward the inside of the segment 8 so as to be flush with the convex inner surface 831c.

  The convex outer surface 831b is formed to be substantially parallel to the skin plate 82, one step down from the outer peripheral surface of the tunnel to the inner peripheral surface side. In addition, the convex inner surface 831c is formed one step higher than the inner peripheral surface of the tunnel toward the outer peripheral surface side and is formed substantially parallel to the convex outer surface 831b.

  On the other hand, as shown on the right side of FIG. 8A, the recess 832 is parallel to the outer plate 832d formed of a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 82 and the outer plate 832d. It is formed by passing a steel plate between the inner plate 832e which is disposed in the upper surface and forms the inner peripheral surface of the segment 8.

  That is, the concave portion 832 is formed by attaching the steel plate so as to form a web surface 832a that is substantially orthogonal to the outer plate 832d and the inner plate 832e and is recessed inward from the end surfaces thereof.

  The lower surface of the outer plate 832d protruding outward from the web surface 832a on the outer peripheral surface side of the tunnel becomes the outer flange surface 832b, and the upper surface of the inner plate 832e protruding outward from the web surface 832a on the inner peripheral surface side of the tunnel. Becomes the inner flange surface 832c. Further, the protruding length of the inner flange surface 832c in the joint direction (tunnel axis direction) is longer than the protruding length of the outer flange surface 832b in the joint direction.

  When the convex part 831 and the concave part 832 configured in this way are fitted together, as shown in FIG. 8B, in the inter-ring joint part 83 between the segments 8A and 8B adjacent in the tunnel axis direction, the convex part 831 The three surfaces (the convex surface 831a, the convex outer surface 831b, and the convex inner surface 831c) and the three surfaces of the concave portion 832 (the web surface 832a, the outer flange surface 832b, and the inner flange surface 832c) come into contact with each other.

  Further, a recess extending in the circumferential direction of the tunnel is provided in each of the convex surface 831a and the web surface 832a, and a sealing material 34 is interposed in the recess as shown in FIG. 8B.

  Furthermore, in Example 2, the end surface of the outer plate 831d and the end surface of the outer plate 832d are abutted on the outer peripheral surface side of the tunnel in which the concave and convex portions are fitted. Further, the protruding portion of the inner plate 832e is inserted into the notch portion 831e on the inner peripheral surface side of the tunnel with the uneven fitting.

  Since the segment 8 of Example 2 configured in this manner has surface contact even at the top and bottom of the concave-convex fitting structure, the contact area is wide and the joint structure is stable, and the resistance to shearing force can be increased. .

  Further, by making the projecting length of the inner flange surface 832c longer than the projecting length of the outer flange surface 832b, the desired shearing can be achieved even in tunnels where internal water pressure acts, such as underground adjustment ponds and sewer pipes. The yield strength against the force can be ensured without excessively increasing the thickness of the segment 8.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, Example 3 of a form different from the above-described embodiment and other examples will be described with reference to FIG. Note that the description of the same or equivalent parts as those described in the embodiment or other examples will be given with the same reference numerals.

  In the segment 9 described in the third embodiment, a concave-convex fitting structure is formed in the inter-ring joint portion 93 that becomes the joint portion in the axial direction of the tunnel. That is, as shown in FIG. 9A, a pair of convex portions 931 and concave portions 932 are formed on both side edges of the segment 9 in the tunnel axis direction, and adjacent segments 9A as shown in FIG. 9B. 9B, the convex portion 931 and the concave portion 932 are fitted to form a concave-convex fitting structure.

  As shown on the left side of FIG. 9A, the convex portion 931 is formed so as to be parallel to the outer plate 931d formed by a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 92 and the outer plate 931d. Are formed by passing a steel plate between the inner plate 931e disposed in the notch 931f on the inner peripheral surface of the segment 9.

  That is, the convex portion 931 is formed by attaching the steel plate so as to form a convex surface 931a that is substantially orthogonal to the outer plate 931d and the inner plate 931e and protrudes outward from the end surfaces thereof.

  A surface substantially orthogonal to the convex surface 931a on the outer peripheral surface side of the tunnel is a convex outer surface 931b, and a surface substantially orthogonal to the convex surface 931a on the inner peripheral surface side of the tunnel is a convex inner surface 931c. The convex outer surface 931b is formed to be substantially parallel to the skin plate 92, one step down from the outer peripheral surface of the tunnel to the inner peripheral surface side. Further, the convex inner surface 931c is formed one step up from the inner peripheral surface of the tunnel to the outer peripheral surface side and is formed substantially parallel to the convex outer surface 931b.

  On the other hand, as shown on the right side of FIG. 9A, the recess 932 is parallel to the outer plate 932d formed of a strip-shaped steel plate attached to the inner peripheral surface side of the skin plate 92 and the outer plate 932d. It is formed by passing a steel plate between the inner plate 932e and the inner plate 932e forming the inner peripheral surface of the segment 9.

  That is, the concave portion 932 is formed by attaching the steel plate so as to form a web surface 932a that is substantially orthogonal to the outer plate 932d and the inner plate 932e and that is recessed inwardly from the end surfaces thereof.

  The lower surface of the outer plate 932d protruding outward from the web surface 932a on the outer peripheral surface side of the tunnel becomes the outer flange surface 932b, and the upper surface of the inner plate 932e protruding outward from the web surface 932a on the inner peripheral surface side of the tunnel. Becomes the inner flange surface 932c. Further, the protruding length of the inner flange surface 932c in the joint direction is longer than the protruding length of the outer flange surface 932b in the joint direction.

  When the convex portion 931 and the concave portion 932 configured in this manner are fitted together, as shown in FIG. 9B, in the inter-ring joint portion 93 between the segments 9A and 9B adjacent in the tunnel axis direction, the convex portion 931 The three surfaces (convex surface 931a, convex outer surface 931b, convex inner surface 931c) and the three surfaces of the concave portion 932 (web surface 932a, outer flange surface 932b, inner flange surface 932c) come into contact with each other.

  Further, a recess extending in the circumferential direction of the tunnel is provided in each of the convex surface 931a and the web surface 932a, and the sealing material 34 is interposed in the recess as shown in FIG. 9B.

  Furthermore, in Example 3, the end surface of the outer plate 931d and the end surface of the outer plate 932d are abutted on the outer peripheral surface side of the tunnel for concave and convex fitting. In addition, on the tunnel inner peripheral surface side of the concave and convex fitting, the protruding portion of the inner plate 932e is inserted into the notch portion 931f, and the inner flange surface 932c is brought into contact with the lower surface of the inner plate 931e. Here, a gap is generated between the notch 931f and the inner plate 932e.

  Since the segment 9 of Example 3 configured as described above causes surface contact even at the top and bottom of the concave-convex fitting structure, a stable joint structure with a wide contact area can be obtained and the yield strength against shearing force can be increased. .

  Further, by making the protruding length of the inner flange surface 932c longer than the protruding length of the outer flange surface 932b, a desired shear can be achieved even in tunnels where internal water pressure acts, such as underground adjustment ponds and sewer pipes. The yield strength against the force can be ensured without making the thickness of the segment 9 excessive.

  Furthermore, by arranging the inner plate 931e in the notch 931f and opening the gap between the inserted inner plate 932e, the contact between the concrete portion 4 of the segment 9B and the inner plate 932e does not occur. It is possible to prevent the portion 4 from being damaged.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to the embodiment and the example, and the design change is within a range not departing from the gist of the present invention. Are included in the present invention.

For example, in the above-described embodiments and examples, the case where the inter-ring joint portions 3, 73, 83, and 93 have a concave-convex fitting structure is described. In the embodiment and the examples, the segments 1, 7, 8, and 9 where the steel material is exposed on the inner peripheral surface side of the tunnel have been described. However, the present invention is not limited to this. Instead, the concrete portion 4 may be formed so that the steel material on the inner peripheral surface side of the tunnel is covered with a fire resistance of 50 mm to 70 mm.

  Furthermore, in the said embodiment and Example, although the case where the concrete part 4 was provided in the interior was demonstrated, it is not limited to this, The steel-made segment only of steel materials may be sufficient. The present invention can also be applied to the case where concrete is placed inside after assembling steel segments into a cylindrical shape.

  Moreover, although the said embodiment demonstrated the structure which provides the shearing projection parts 53 and 53 in the joint board 55, it is not limited to this, What is necessary is just to provide as needed.

1, 1A, 1B Segment 2 Skin plate 3 Inter-ring joint portion 31 Convex portion 31a Convex surface 31b Convex outer surface 31c Convex inner surface 32 Recess 32a Web surface 32b Outer flange surface 32c Inner flange surface 33 Tensile joint 34 Seal material 4 Concrete portion 5 Between segments Joint portion 7, 7A, 7B Segment 72 Skin plate 73 Inter-ring joint portion 731 Convex portion 731a Convex surface 731b Convex outer surface 731c Convex inner surface 732 Concave portion 732a Web surface 732b Outer flange surface 732c Inner flange surface 8, 8A, 8B Segment 82 Skin plate 83 Inter-ring joint portion 831 Convex portion 831a Convex surface 831b Convex outer surface 831c Convex inner surface 832 Concave portion 832a Web surface 832b Outer flange surface 832c Inner flange surfaces 9, 9A, 9B Segment 92 Skin plate 93 Inter-ring joint portion 931 Convex portion In 31a convex 931b Totsugaimen 931c convex inner surface 932 recess 932a web surface 932b outer flange surface 932c flange surface

Claims (6)

A segment that forms the outer shell of a tunnel by combining a plurality,
A skin plate that forms the outer peripheral surface of the tunnel;
A ring-to-ring joint portion standing in pairs on both side edges of the skin plate at an interval in the axial direction of the tunnel;
An inter-segment joint portion standing in pairs on both edges of the skin plate at intervals in the circumferential direction of the tunnel;
A concave-convex fitting structure in which surface contact between surfaces substantially perpendicular to the joint direction is generated when joining with another segment installed adjacent to at least one of the joint part between rings or the joint part between segments. A segment characterized in that is formed.   The concave-convex fitting structure has a convex outer surface formed through a step from the outer peripheral surface of the tunnel to the inner peripheral surface side, a convex surface substantially orthogonal to the convex outer surface, and a step from the inner peripheral surface of the tunnel to the outer peripheral surface side. Formed by a convex portion having a convex inner surface, an outer flange surface in contact with the convex outer surface, a web surface in contact with the convex surface, and a concave portion having an inner flange surface in contact with the convex inner surface. The segment of claim 1 characterized.   3. The segment according to claim 2, wherein the convex portion is formed of a steel material having a substantially U-shaped cross-sectional view, and the concave portion is formed of a steel material having a substantially I-shaped or substantially H-shaped cross-sectional view.   The segment according to claim 2 or 3, wherein a protruding length of the inner flange surface in the joint direction is longer than a protruding length of the outer flange surface in the joint direction.   The segment according to any one of claims 1 to 4, wherein a sealing material is interposed between surfaces on which the surface contact is generated.   The segment according to any one of claims 1 to 5, wherein a tensile joint serving as a pull-out resistance is provided in a joint portion in which the uneven fitting structure is formed.

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