JP2017106304A - Segments - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plurality of segments with improved integration connected to each other to construct a tunnel while increasing strength of each main girder plate or splice plate.SOLUTION: A plurality of segments 1 are connected to construct a tunnel, and each comprise a pair of main girder plates 3 disposed at both ends in an axial direction X and a pair of splice plates disposed at both ends in a circumferential direction Y. The pair of main girder plates 3 comprises a one-end main girder plate 31 disposed at one end in the axial direction X and an other-end main girder plate 32 disposed at the other end in the axial direction X, each plate including a body part 20 formed to extend in a normal direction Z such that an engagement protrusion part 21 protruding from the body part 20 in the axial direction X is formed in the one-end main girder plate 31 and such that an engagement receiving part 22 recessed from the body part 20 in the axial direction X is formed in the other-end main girder plate 32. The engagement protrusion part 21 of the one-end main girder plate 31 and the engagement receiving part 22 of the other-end main girder plate 32 are formed continuously in the circumferential direction Y substantially at the same position in the normal direction Z.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a segment in which a tunnel is constructed by connecting a plurality.

  Conventionally, it was disclosed in Patent Documents 1 to 3 for the purpose of improving the ultimate strength of the composite segment by surely improving the integrity of the steel shell provided with vertical ribs and the concrete filled in the segment. A synthetic segment has been proposed.

  The composite segment disclosed in Patent Document 1 has a longitudinal rib fixed to the main girder, and a surface extending in the tunnel axial direction including a normal line in the tunnel radial direction passing through the skin plate side end portion of the longitudinal rib. The center of at least one bent portion of the vertical rib and the end of the vertical rib on the inner side of the tunnel extend in the tunnel axial direction including the normal line in the tunnel radial direction in a sectional view in the tunnel axial direction. It arrange | positions at one and the other of the surface so that a surface may be pinched | interposed.

  The composite segment disclosed in Patent Document 2 includes a main girder in a steel-based segment composed of a main girder, a joint plate, a skin plate, and vertical ribs. The ribs are fixed, and a bar-shaped steel material is inserted through the opening provided in each of the vertical ribs, and the segment is filled with concrete so as to embed the vertical ribs and the bar-shaped steel material. .

JP 2008-297817 A JP 2004-270276 A JP 2000-291389 A

  Here, the composite segments disclosed in Patent Documents 1 and 2 are connected to other composite segments adjacent to each other in the axial direction and the circumferential direction of the tunnel, whereby a tunnel is constructed. And the synthetic | combination segment disclosed by patent document 1, 2 uses a substantially flat steel plate as each main girder and a joint board.

  At this time, the composite segments disclosed in Patent Documents 1 and 2 are formed so that each main beam and the joint plate are formed in a substantially flat plate shape, and therefore, between the other composite segments connected adjacent to each other, Each main girder or joint plate is brought into contact with each other on a substantially flat surface. For this reason, since the composite segments disclosed in Patent Documents 1 and 2 are merely in contact with each main girder or joint plate at a substantially flat surface, the integrity of the composite segments connected to each other is improved. It was an issue.

  Furthermore, in the event of an earthquake, the surrounding ground deformation acts on the tunnel, causing water leakage from the gap between the segment rings connected adjacent to each other, resulting in a problem that the durability is significantly impaired.

  In addition, the synthetic segment disclosed in Patent Document 3 includes a male-side engagement member and a female-side engagement in which the steel shell segments are connected in the tunnel axial direction (between the segment rings) on the web of the steel shell side frame. This is performed by engaging with a member through a water-stop packing (seal material). By simply providing the engaging portion, the unity between the combined segments connected to each other is improved, but the processing of the segments is increased and the manufacturing cost is high.

  Accordingly, the present invention has been devised in view of the above-described problems, and the object of the present invention is to increase the strength of each main girder plate or joint plate and to make steel shells and filled concrete. In addition to strengthening the integration, it is possible to improve the integrity of a plurality of segments connected to each other and to reduce the manufacturing cost, and to provide a segment that enhances the durability of the tunnel. .

  A segment according to the first invention is a segment in which a tunnel is constructed by connecting a plurality of segments, and a pair of main girders arranged at both ends in the axial direction of the tunnel, and both ends in the circumferential direction of the tunnel And a pair of main girder plates formed by being surrounded by a pair of the main girder plates and the pair of joint plates. Are one end side main girder plate that is the main girder plate arranged on one end side in the axial direction of the tunnel, and the other end side main girder that is the main girder plate arranged on the other end side in the axial direction of the tunnel A main body portion extending in a normal direction of the tunnel is formed on the plate, and a fitting convex portion protruding from the main body portion in the axial direction of the tunnel is formed on the one end side main beam plate, and the tunnel is formed from the main body portion. The other end side main girder is fitted in the axial direction And the fitting projection formed on the one end side main beam plate and the fitting receiving portion formed on the other end side main beam plate are substantially the same in the normal direction of the tunnel. It is characterized in that it is continuously formed at the position in the circumferential direction of the tunnel.

  The segment according to the second invention is the first invention, wherein each of the main girders is formed by either one or both of the fitting convex part and the fitting receiving part being locked to the filling concrete. It is also formed on the inner side of the steel shell in the axial direction.

  According to a third aspect of the present invention, in the first or second aspect of the invention, each of the main girder plates is formed with the fitting convex portions and the fitting receiving portions on both side surfaces of the main body portion in the axial direction of the tunnel. The fitting convex portion formed on one side surface of the main body portion and the fitting receiving portion formed on the other side surface of the main body portion are in substantially the same position in the normal direction of the tunnel. It is formed.

  A segment according to a fourth invention is the segment according to any one of the first to third inventions, wherein each main girder is in contact with the main girder of another segment connected adjacent to each other in the axial direction of the tunnel. In such a state, a water stop groove that is concave from the outside in the axial direction of the tunnel to the inside is formed continuously from the fitting convex part or the fitting receiving part in the normal direction of the tunnel. Features.

  The segment according to a fifth aspect of the present invention is the segment according to any one of the first to fourth aspects of the present invention, wherein each of the main girder plates has a centroid position and a gravity center position substantially coincide with each other in a cross-sectional direction with respect to the circumferential direction of the tunnel. The fitting projection and the fitting receiving part are formed on the main body.

  The segment according to a sixth aspect of the present invention is the segment according to any one of the first to fifth aspects, wherein the one end side main beam plate and the other end side main beam plate are fitted to the outside of the steel shell in the axial direction of the tunnel. A convex portion and the fitting receiving portion are formed, and the convex portion and the fitting receiving portion are arranged symmetrically with respect to the center point in the circumferential section of the segment.

  The segment according to a seventh aspect of the present invention is the segment according to any one of the first to sixth aspects, wherein a displacement preventing member is provided in which one end portion of the tunnel in the axial direction is fixed to the main girder plate inside the steel shell. It is characterized by that.

  The segment according to the eighth invention is the segment according to any one of the first to seventh inventions, wherein a reinforcing member is provided in which both ends in the axial direction of the tunnel are fixed to the pair of main girder plates inside the steel shell. It is characterized by.

  A segment according to a ninth invention is the segment according to any one of the first invention to the eighth invention, wherein a plurality of main steel materials extending in the circumferential direction of the tunnel are provided inside the steel shell, and extending in the axial direction of the tunnel. It is characterized in that a distribution bar which is in contact with the main steel material is provided.

  The segment according to a tenth aspect of the present invention is the segment according to any one of the first to ninth aspects, wherein the both ends of the tunnel in the axial direction are fixed to the pair of main girders in the steel shell. And a distribution bar extending in the axial direction of the tunnel is provided in contact with the longitudinal rib or spaced from the longitudinal rib in the circumferential direction of the tunnel.

  The segment according to an eleventh aspect of the invention is the segment according to any one of the first to tenth aspects of the invention, wherein the both ends of the tunnel in the axial direction are fixed to the pair of main girder plates inside the steel shell. However, it is characterized in that it is provided so as to be spaced apart in the normal direction of the tunnel from the skin plate provided on either or both of the natural mountain side and the inner sky side in the normal direction of the tunnel.

  The segment according to a twelfth aspect of the present invention is characterized in that, in any one of the first to eleventh aspects, the main girder plate is in contact with a reinforcing plate extending in the circumferential direction of the tunnel.

  The segment according to a thirteenth aspect of the present invention is characterized in that, in any one of the first to twelfth aspects, a reinforcing main girder extending in the circumferential direction of the tunnel is provided inside the steel shell.

  A segment according to a fourteenth aspect of the present invention is the segment according to the thirteenth aspect, wherein the reinforcing main girder is provided so that the cross-sectional shape with respect to the circumferential direction of the tunnel is substantially H-shaped or substantially T-shaped and protrudes into the steel shell. It is characterized by.

  The segment according to a fifteenth aspect of the present invention is the segment according to the thirteenth aspect, wherein the reinforcing main girder has a cross-sectional shape with respect to the circumferential direction of the tunnel substantially the same as each main girder plate, and protrudes into the steel shell. It is provided.

  In a sixteenth aspect of the present invention, in any one of the thirteenth to fifteenth aspects, the reinforcing main girder is provided with a displacement preventing member in which one end portion in the axial direction of the tunnel is fixed to the reinforcing main girder. Features.

  A segment according to the seventeenth invention is a segment in which a tunnel is constructed by connecting a plurality of segments, and a pair of main girders arranged at both ends in the axial direction of the tunnel and at both ends in the circumferential direction of the tunnel A pair of joint plates arranged, and a steel shell filled with filled concrete is surrounded by the pair of main girder plates and the pair of joint plates, and the pair of joint plates is The one end side joint plate that becomes the joint plate arranged on one end side in the circumferential direction of the tunnel, and the other end side joint plate that becomes the joint plate arranged on the other end side in the circumferential direction of the tunnel, A main body portion extending in the normal direction is formed, and a fitting convex portion protruding from the main body portion in the circumferential direction of the tunnel is formed in the one end side joint plate, and is recessed from the main body portion in the circumferential direction of the tunnel. The fitting receiving part is connected to the other end side The fitting convex portion formed on the one end side joint plate and the fitting receiving portion formed on the other end side joint plate are formed at the same position in the normal direction of the tunnel. It is characterized by being formed continuously in the axial direction of the tunnel.

  A segment according to an eighteenth aspect of the present invention is the segment according to any one of the first aspect to the seventeenth aspect, wherein a plurality of the segments are connected in a ring shape in the circumferential direction of the tunnel and are adjacently connected in the axial direction of the tunnel. The other segment ring is characterized in that the fitting convex portion and the fitting receiving portion are fitted to each other over substantially the entire circumference in the circumferential direction of each segment ring.

  According to a nineteenth aspect of the present invention, in the eighteenth aspect, each segment ring connected adjacently in the axial direction of the tunnel has a water stop groove that is concave from the outer side toward the inner side in the axial direction of the tunnel. The water stop groove is formed with a gap that can expand in a watertight manner in the axial direction of the tunnel. Even in the watertight expansion, the fitting convex portion and the fitting receiving portion are tunneled. They are fitted to each other in the normal direction.

  The segment according to a twentieth aspect of the present invention is the segment according to any one of the first aspect to the nineteenth aspect, wherein the segment is a reinforced concrete segment reinforced with the steel shell, a concrete-filled steel segment, a simple synthetic segment, or a synthetic segment. It is either.

  The segment according to the twenty-first invention is the segment according to any one of the first to twentieth inventions, wherein the segment is provided with a detent member in the normal direction of the tunnel continuously provided in the circumferential direction of the tunnel, and the tangent of the tunnel The direction deviation preventing member is provided intermittently over the circumferential direction of the tunnel.

  According to 1st invention-21st invention, each fitting convex part and fitting receiving part of a pair of main girder board are formed in the shape which respond | corresponds in the mutually substantially same position in a normal line direction. It becomes possible to improve the integrity of a plurality of segments connected in the axial direction. Moreover, according to 1st invention-21st invention, each main girder board uses segment shape steel of predetermined cross-sectional shape, and a fitting convex part and a fitting receiving part are formed, The rigidity in the out-of-plane direction and the in-plane direction of the main girder plate is improved, and it becomes possible to increase the strength of each main girder plate.

  In particular, according to the second aspect of the present invention, the inner filling concrete and the steel shell filled in the steel shell by engaging the fitting convex portion or the fitting receiving portion with the inner filling concrete even on the inner side of the steel shell. It becomes possible to improve the unity. Further, according to the second invention, it is possible to prevent the filling concrete from coming out of the steel shell and falling into the in-service tunnel, so that safety can be improved.

  In particular, according to the third aspect of the present invention, the inside-filled concrete and the steel shell are filled in the steel shell by engaging the fitting convex portion and the fitting receiving portion with the inside-filled concrete even on the inner side of the steel shell. It becomes possible to improve the unity. In addition, according to the third invention, the segment shape steel having substantially the same shape is used as each main girder, and the segment shape steel to be the main girder is shared, thereby reducing the production cost of the segment. It becomes possible.

  In particular, according to the fourth invention, in the state after the groundwater pressure is applied from the natural ground side, the sealing material is tightly sandwiched between the water stop grooves, so that the ingress of the groundwater and the like is reliably blocked by the tightly sealing material. Therefore, it becomes possible to remarkably improve the water stop performance at the connecting portions of the plurality of segments. Further, according to the fourth invention, an independent water stop structure is provided by forming the water stop groove that is continuous in the normal direction from the fitting convex portion or the fitting receiving portion and is concave in the axial direction. Therefore, it is possible to avoid an increase in the production cost of the segment.

  In particular, according to the fifth aspect of the present invention, the centroid position and the center of gravity position substantially coincide with each other in the cross-sectional direction of the segment shape steel serving as the main girder. In addition, a high level of quality and dimensional accuracy can be ensured.

  In particular, according to the sixth invention, the one end side main girder plate and the other end side main girder plate are arranged point-symmetrically with respect to the center point in the circumferential cross section of the segment, so that the segment that becomes the main girder plate It becomes possible to share the shape steel and reduce the production cost of the segment.

  In particular, according to the seventh aspect of the present invention, the predetermined slip-preventing member is provided inside the steel shell, so that the slip-preventing member is embedded and locked in the filling concrete so that the slippage between the filling concrete and the steel shell is prevented. The stopping function can be exhibited.

  In particular, according to the eighth invention, a predetermined reinforcing member is provided inside the steel shell, and the reinforcing member is installed to increase the strength of the filled concrete and to reliably transfer the load to the main girder plate. This makes it possible to deal with wide segments.

  In particular, according to the ninth invention, a plurality of main steel materials extending in the circumferential direction inside the steel shell, and distribution bars extending in the axial direction and contacting the main steel materials are provided, and a plurality of main steel materials are provided. By integrating the steel materials with the reinforcing bars, it is possible to reinforce the filling concrete embedded with multiple main steel materials and the reinforcing bars to cope with the high loads at large depths applied to the segments. Is possible.

  In particular, according to the tenth aspect of the present invention, the distribution bars are provided apart from the vertical ribs so that the space between the plurality of vertical ribs is reinforced by the distribution bars, and the low strength portion is formed in the filling concrete. This can be avoided. Further, according to the tenth aspect of the invention, since the reinforcing bars are provided in contact with the longitudinal ribs, the main steel material, the distributing bars, the longitudinal ribs and the main girders can be easily fixed, and the segments having high unity can be obtained. Can be provided.

  In particular, according to the eleventh aspect, the vertical rib is provided in the normal direction away from the skin plate, and a predetermined gap is formed between the skin plate and the vertical rib, so that the concrete is filled. The fresh concrete can pass through the gap, and the fluidity of the fresh concrete can be ensured to improve the filling property into the steel shell.

  In particular, according to the twelfth invention, by providing a reinforcing plate in contact with the segmented steel to be the main beam plate, etc., the rigidity in the out-of-plane direction and in-plane direction of the segmented steel is improved, It is possible to increase the strength of the main girder plate.

  In particular, according to the thirteenth to fifteenth inventions, the reinforcing main girder of the H-shaped steel, CT-shaped steel or segmented steel having a predetermined cross-sectional shape is provided inside the steel shell, so It is possible to realize a proper load transmission and to cope with a wide segment.

  In particular, according to the sixteenth aspect of the present invention, it is possible to exert a function of preventing the slippage of the filling concrete and the steel shell by embedding and locking the slippage preventing member in the filling concrete inside the steel shell. Become.

  In particular, according to the seventeenth aspect, the fitting convex portions and the fitting receiving portions of each of the pair of joint plates are formed in corresponding shapes at substantially the same position in the normal direction, so that the circumferential direction It is possible to improve the integrity of a plurality of segments connected to each other.

  In particular, according to the eighteenth aspect, in the segment ring adjacent in the tunnel axis direction formed by assembling the segments into a ring shape, it is fitted between the protruding protrusions and the fitting receiving portions protruding between the adjacent segment rings. Therefore, even when an earthquake occurs, the tunnel is deformed following the deformation of the surrounding ground, and the durability can be improved.

  In particular, according to the nineteenth invention, in the segment ring adjacent in the tunnel axis direction formed by assembling the segments into a ring shape, it is fitted between the protruding protrusions and the fitting receiving portions protruding between the adjacent segment rings. In addition, the water stop groove provided in the segment ring is provided with a gap that allows watertight expansion in the axial direction, so that the tunnel follows the deformation of the surrounding ground even in the event of an earthquake. Deformation is prevented, and water leakage from the gap between the segment rings connected adjacent to each other is prevented, and durability can be improved.

  In particular, according to the twentieth invention, a reinforced concrete segment reinforced with a steel shell, a concrete-filled steel segment, a simple composite segment, and a composite are provided by appropriately installing a stopper member according to the load acting on the tunnel. It can be configured in any of the segments, and a reasonable structural specification can be made according to the load bearing performance required for the segments.

  In particular, according to the twenty-first invention, a reinforced concrete segment reinforced with a steel shell, a concrete-filled steel segment, a simple composite segment, and a composite by appropriately installing a slip prevention member according to the load acting on the tunnel It can be configured in any of the segments, and the steel shell and the concrete can be firmly integrated by continuously providing a detent in the tunnel normal direction in which earth water pressure acts. In addition, by providing intermittent stoppers in the tunnel tangential direction, an effect of improving the yield strength can be obtained in accordance with the load bearing performance required for the segment, so that a rational structural specification can be achieved.

It is a perspective view which shows the tunnel constructed | assembled by the segment to which this invention is applied. It is a perspective view which shows the segment to which this invention is applied. It is the expansion front view of the circumferential direction which shows the main girder of the segment to which this invention is applied. It is the front view of the circumferential direction which shows the state in which the segment shape steel formed asymmetrically as a main girder in the segment to which this invention is applied was used. It is the front view of the circumferential direction which shows the state where the segment shape steel formed symmetrically as a main girder with the segment which applied this invention was used. It is the expansion front view of the circumferential direction which shows the state in which a centroid position and a gravity center position substantially correspond with the segment shape steel used for the segment to which this invention is applied. It is the expansion front view of the circumferential direction which shows the state in which a centroid position and a gravity center position correspond substantially in the modification of the segment shape steel used for the segment to which this invention is applied. (A) is a side view which shows the slip prevention member of the headed stud provided in the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the slip prevention member of the steel plate provided in the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the reinforcing member of the steel plate provided in the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the reinforcing member of the reinforcing bar or steel bar provided in the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the some main steel materials provided in the segment to which this invention is applied, and a power distribution reinforcement, (b) is the bottom view. It is the front view of the circumferential direction which shows the some main steel materials and distribution reinforcement provided in the segment to which this invention is applied. (A) is a side view which shows the vertical rib contact | abutted with the skin plate of the natural ground side by the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the vertical rib spaced apart from the skin plate by the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the power distribution line spaced apart from the vertical rib by the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the distribution line contact | abutted to the vertical rib spaced apart from the skin plate by the segment to which this invention is applied, (b) is the bottom view. (A) is a side view which shows the distribution line contact | abutted by the vertical rib made to contact | abut to the skin plate by the segment to which this invention is applied, (b) is the bottom view. It is the front view of the circumferential direction which shows the vertical rib provided in the segment to which this invention is applied, several main steel materials, and a power distribution reinforcement. (A) is a side view which shows arrangement | positioning of a triangular rib in the segment to which this invention is applied, (b) is the front view of the circumferential direction. (A) is a side view which shows the reinforcement plate provided in the segment to which this invention is applied, (b) is the front view of the circumferential direction. (A) is a front view which shows the reinforcement plate inside a web with a line symmetrical main girder board, (b) is a front view which shows the reinforcement plate of the outer side, (c) is the outer side and It is a front view which shows an inner side reinforcement plate. (A) is a front view showing a reinforcing plate on the natural ground side of the flange with an axisymmetric main girder plate, (b) is a front view showing the reinforcing plate on the natural ground side and the inside air side, (c ) Is a front view showing a reinforcing plate provided on the flange and the web. (A) is a front view showing a state where a plurality of segments are connected by an asymmetric main girder, and (b) is a front view showing a state where a plurality of segments are connected by a line-symmetric main girder, c) is a front view showing a state in which the asymmetric main girder plate and the axisymmetric main girder plate are connected to each other. (A) is a front view which shows the substantially H-shaped reinforcement main girder provided in the segment to which this invention is applied, (b) is a front view which shows the substantially T-shaped reinforcement main girder, (c ) Is a front view showing a reinforcing main beam having substantially the same shape as the main beam plate. It is a front view which shows the reinforcement main girder in which the slip prevention member is provided in the segment to which this invention is applied. It is a front view which shows the state with which the segment to which this invention was applied was connected with two or more by the axial direction. It is a front view which shows the modification of the state in which the segment to which this invention was applied was connected with two or more by the axial direction. It is the expansion front view of the circumferential direction which shows the state by which each main girder of the segment to which this invention was applied was contact | abutted to the axial direction. (A) is an enlarged front view which shows the water stop groove before a groundwater pressure acts in the segment which applied this invention, (b) is an enlarged front view which shows the water stop groove after the groundwater pressure acts FIG. It is an enlarged front view which shows the water stop groove formed independently by the segment which applied this invention from the fitting convex part or the fitting receiving part. (A) is a side view which shows the normal direction and the circumferential direction slip prevention member provided in the segment to which this invention is applied, (b) is the bottom view. It is a graph which shows the relationship between deviation | shift amount and manufacture difficulty in the segment to which this invention is applied.

  Hereinafter, the form for implementing the segment 1 to which this invention is applied is demonstrated in detail, referring drawings.

  As shown in FIG. 1, the segment 1 to which the present invention is applied is constructed by connecting a plurality of segments 1 in the axial direction X and the circumferential direction Y of the tunnel 7.

  The tunnel 7 is provided in an excavation hole formed by excavating a natural ground or the like by a shield method or the like, or an excavation hole formed by excavating the natural ground or the like. For example, the tunnel 7 is formed in a substantially cylindrical shape in the axial direction X, but is not limited thereto, and may be formed in a substantially rectangular tube shape or the like.

  In the tunnel 7, a plurality of segments 1 are connected in the circumferential direction Y to form a segment ring 70. Further, the tunnel 7 is formed in a substantially cylindrical shape or the like in the axial direction X that is an extension direction of the tunnel 7 by connecting the plurality of segment rings 70 in the axial direction X.

  The tunnel 7 is constructed such that a plurality of segment rings 70 are connected in the axial direction X so as to separate the natural mountain side Z1 and the inner air side Z2 in the normal direction Z that is the radial direction of the tunnel 7. Thus, a predetermined internal space S is secured on the inner space side Z2 in the normal direction Z.

  As shown in FIG. 2, the segment 1 to which the present invention is applied includes a pair of main girder plates 3 disposed at both ends in the axial direction X, and a pair of joint plates 4 disposed at both ends in the circumferential direction Y. Is provided.

  In the segment 1 to which the present invention is applied, a pair of main girders 3 are arranged substantially parallel to each other with a predetermined interval in the axial direction X. Further, the segment 1 to which the present invention is applied is arranged so that the pair of joint plates 4 are inclined with respect to each other with a predetermined interval in the circumferential direction Y.

  In the segment 1 to which the present invention is applied, both end portions in the circumferential direction Y of the main girder plate 3 are joined to both end portions in the axial direction X of the joint plate 4, so that a predetermined amount in the axial direction X and the circumferential direction Y is obtained. A substantially box-shaped steel shell 6 surrounded by a pair of main girder plates 3 and a pair of joint plates 4 spaced apart is formed.

  The segment 1 to which the present invention is applied is surrounded by the pair of main girder plates 3 and the pair of joint plates 4, thereby forming the steel shell 6 in which the inside-filled concrete 60 is filled in the interior 6 a. In the segment 1 to which the present invention is applied, a skin plate 5 is provided in the normal direction Z so as to cover the inside 6a of the steel shell 6 on either one or both of the natural mountain side Z1 and the inner air side Z2. It is done.

  The segment 1 to which the present invention is applied is particularly formed by using a segmented steel 2 formed with a predetermined cross-sectional shape as each main girder 3 and bending the segmented steel 2 in the circumferential direction Y. Is done. Moreover, the segment 1 to which the present invention is applied may be used as each joint plate 4 without the segment shape steel 2 being bent or the like, if necessary.

  As shown in FIG. 3, each main girder 3 uses a segmented steel 2 formed in a predetermined cross-sectional shape, so that a main body portion 20 extending in the normal direction Z in the cross-sectional direction with respect to the circumferential direction Y. Then, a fitting convex portion 21 convex in the axial direction X and a fitting receiving portion 22 concave in the axial direction X are formed.

  Each main girder 3 is formed with a fitting convex portion 21 projecting from the main body portion 20 to the outer side A in the axial direction X on the main body portion 20 extending in the normal direction Z, and more than the fitting convex portion 21. The fitting receiving part 22 arrange | positioned at the inner side B of the axial direction X is formed.

  Each main girder plate 3 has a curved surface 2a having a substantially arcuate cross section or the like, and the fitting convex portion 21 or the fitting receiving portion 22 is curved as necessary. In addition, each main girder plate 3 has a flat surface 2b having a substantially flat cross section or the like, and the fitting convex portion 21 or the fitting receiving portion 22 is flat as necessary.

  Here, as shown in FIG. 4, the pair of main girder plates 3 are arranged such that the main girder plate 3 disposed on one end side in the axial direction X becomes one end side main girder plate 31 and the other end side in the axial direction X. The main girder plate 3 disposed on the other end becomes the other end side main girder plate 32, and the one end side main girder plate 31 and the other end side main girder plate 32 become a pair of main girder plates 3.

  The one-end-side main girder 31 protrudes toward the outer side A in the axial direction X, which is the opposite side of the inner portion 6a of the steel shell 6, to form a curved fitting convex portion 21 and a curved fitting. A flat fitting receiving portion 22 is formed on the inner side B in the axial direction X that is closer to the inside 6 a of the steel shell 6 than the convex portion 21.

  The other end side main girder plate 32 protrudes toward the outer side A in the axial direction X which is the opposite side of the inside 6a of the steel shell 6 to form a flat fitting convex portion 21 and a flat fitting. A curved fitting receiving portion 22 is formed on the inner side B in the axial direction X, which is closer to the inside 6a of the steel shell 6 than the joint convex portion 21.

  In the pair of main girder plates 3, main body portions 20 extending in the normal direction Z are formed on each of the one end side main girder plate 31 and the other end side main girder plate 32 arranged at both ends in the axial direction X. At this time, the pair of main girder plates 3 are fitted with recessed projections 21 projecting from the main body 20 in the axial direction X on the one end side main girder plate 31 and recessed from the main body 20 in the axial direction X. A receiving portion 22 is formed on the other end side main beam plate 32.

  In the pair of main girder plates 3, the curved fitting convex portion 21 of the one end side main girder plate 31 and the curved fitting receiving portion 22 of the other end side main girder plate 32 are mutually in the normal direction Z. They are formed at substantially the same position. The pair of main girders 3 includes a flat fitting receiving portion 22 of the one end side main girdling plate 31 and a flat fitting convex portion 21 of the other end side main girdling plate 32 in the normal direction Z. Are formed at substantially the same position.

  As shown in FIG. 3, each main girder 3 uses a segmented steel 2 formed with a predetermined cross-sectional shape, so that each main girder 3 is curved or A flat fitting convex portion 21 and a fitting receiving portion 22 are formed.

  At this time, each main girder 3 is formed with, for example, a curved fitting convex portion 21 and a flat fitting receiving portion 22 on one side surface 20 a of the main body portion 20, and the other side of the main body portion 20. A flat fitting convex portion 21 and a curved fitting receiving portion 22 are formed on the side surface 20b.

  Each main girder 3 has a curved fitting convex portion 21 on one side surface 20a of the main body portion 20 and a curved fitting receiving portion 22 on the other side surface 20b that are substantially the same in the normal direction Z. Formed in position. Each main girder 3 includes a flat fitting receiving portion 22 on one side surface 20a of the main body portion 20 and a flat fitting convex portion 21 on the other side surface 20b. It is formed at the same position.

  Each main girder 3 has a curved fitting convex portion 21 or a fitting receiving portion 22 at each of both end portions of the main body portion 20 in the normal direction Z on each side surface of the main body portion 20. And the flat fitting convex part 21 or the fitting receiving part 22 is formed in one place.

  As shown in FIG. 4, each main girder plate 3 uses a segmented steel 2 formed asymmetrically in the axial direction X in common with each of the pair of main girder plates 3. At this time, in each main girder plate 3, the fitting convex portion 21 on the one side surface 20 a of the main body portion 20 and the fitting receiving portion 22 on the other side surface 20 b of the main body portion 20 are substantially the same in the normal direction Z. It is formed in a curved shape or a flat shape at the position.

  Each of the main girders 3 is not limited thereto, and as shown in FIG. 5, segmented steel 2 formed in line symmetry in the axial direction X may be used for each of the pair of main girders 3. . At this time, the segmented steel 2 is formed by combining the pair of flanges 25 extending in the axial direction X and the web 26 extending in the normal direction Z to form the main body 20 extending in the normal direction Z.

  When the segment steel 2 formed in line symmetry with respect to the axial direction X is used for each main girder plate 3, the fitting protrusions 21 and fittings such as a flat shape are fitted to both side ends of the pair of flanges 25. A receiving portion 22 is formed. At this time, in the pair of main girders 3, in particular, the fitting convex portion 21 of the one end side main girdling plate 31 and the fitting receiving portion 22 of the other end side main girdling plate 32 are substantially mutually in the normal direction Z. It is continuously formed in the circumferential direction Y at the same position.

  As shown in FIG. 3, each main girder 3 has a main body portion 20 in the normal direction Z so that the centroid position and the gravity center position of the segmented steel 2 are substantially coincided with each other in the cross-sectional direction with respect to the circumferential direction Y. The fitting convex part 21 and the fitting receiving part 22 are formed in the predetermined position of the both sides | surfaces of the main-body part 20 in each of both ends. Here, the position of the center of gravity indicates a balance point of geometric dimensions with respect to the axial direction X and the normal direction Z with respect to the cross-sectional direction with respect to the circumferential direction Y. Further, the centroid position refers to a balance point of the cross-sectional primary moment with respect to the axial direction X and the normal direction Z with respect to the cross-sectional direction with respect to the circumferential direction Y.

  As shown in FIG. 6, the segment shape steel 2 has a deviation Δ in the axial direction X between the centroid position and the gravity center position of 8% or less with respect to the total height H in the normal direction Z or the total width W in the axial direction X. The centroid position and the gravity center position substantially coincide with each other. The segment shape steel 2 desirably has a deviation amount Δ between the centroid position and the center of gravity position of 3% or less with respect to the total height H or the total width W.

  The segmented steel 2 has, for example, a total height H = 225 mm in the normal direction Z and a total width W = 38 mm in the axial direction X. At this time, as shown in FIG. 6A, the segment shape steel 2 has a displacement amount Δ in the axial direction X with respect to the full width W in the axial direction X, assuming that the displacement amount Δ in the axial direction X is 0.055 mm. Is 0.14% (= 0.055 / 38 × 100), and the deviation amount Δ in the normal direction Z is 0 mm, so that the deviation in the normal direction Z with respect to the total height H in the normal direction Z is Since the amount Δ is 0%, the centroid position and the gravity center position substantially coincide.

  If only the deviation amount in the axial direction X is shown, the segment steel 2 has a deviation amount Δ = 0.160 mm as shown in FIG. 6B, and a deviation amount Δ = 0 as shown in FIG. 6C. .286 mm, as shown in FIG. 6D, the deviation amount Δ is 8% or less in any case where the deviation amount Δ = 1.828 mm. Further, as shown in FIG. 7A, the segment shape steel 2 has a deviation amount Δ = 0.527 mm, and as shown in FIG. 7B, the deviation amount Δ = 0.923 mm. When the shift amount Δ is 8% or less, the centroid position and the center of gravity position substantially coincide with each other. In addition, as shown in FIGS. 7 (c) and 7 (d), the segment shape steel 2 can also have a deviation amount Δ≈0.000 mm.

  As shown in FIGS. 8 and 9, the segment 1 to which the present invention is applied is provided with a predetermined displacement preventing member 61 in the inside 6 a of the steel shell 6. Only one end portion in the axial direction X is fixed to each main beam plate 3 by welding or the like, and the other end portion in the axial direction X extends to the inside 6 a of the steel shell 6. And embedded in the filling concrete 60.

  As shown in FIG. 8, the slip prevention member 61 uses a headed stud, and as shown in FIG. 9, a steel plate or the like formed in a substantially flat plate shape is used. Thus, it is intermittently provided at about four locations in the circumferential direction Y over about two steps in the normal direction Z. In the segment 1 to which the present invention is applied, the slip preventing member 61 is embedded and locked in the filling concrete 60, and the slip preventing function between the filling concrete 60 and the steel shell 6 can be exhibited.

  The slip prevention member 61 provided in the inside 6a of the steel shell 6 is provided mainly for the purpose of integrating the steel shell 6 and the filling concrete 60 in the tunnel tangential direction. At this time, the segment 1 to which the present invention is applied has this displacement deformation with respect to the behavior that causes displacement deformation in the tunnel tangential direction between the steel shell 6 and the filled concrete 60 even when a tunnel external force is applied. Can be ensured the behavior of the so-called integral beam structure. And the slip prevention rigidity which resists the slip deformation between the both can be appropriately adjusted by the quantity of the slip prevention member 61 according to the tunnel external force. The anti-slipping rigidity with respect to the tunnel tangential direction has the effect of dramatically increasing the rigidity in the normal direction Z with respect to the external force of the segment 1, resulting in higher strength and rigidity of the tunnel segment, resulting in the thin wall of the tunnel segment. Can be achieved. As a result, it contributes to the application to deep tunnels and the reduction of the tunnel outer diameter.

  As shown in FIGS. 10 and 11, the segment 1 to which the present invention is applied is provided with a predetermined reinforcing member 62 in the inside 6 a of the steel shell 6. The reinforcing member 62 is fixed to the pair of main girder plates 3 in a state where both ends in the axial direction X are fixed to the pair of main girder plates 3 by welding or the like and are laid on the pair of main girder plates 3 inside the steel shell 6. Embedded in.

  As shown in FIG. 10, the reinforcing member 62 is made of a substantially flat steel plate or the like, and as shown in FIG. 11, a reinforcing bar such as a deformed reinforcing bar or a steel bar is used. It is intermittently provided at about four places in the circumferential direction Y over about two stages. In the segment 1 to which the present invention is applied, the reinforcing member 62 is installed, so that the high strength of the filling concrete 60 and the reliable load transmission to the main girder plate 3 are realized. Can also be supported.

  As shown in FIG. 12, the segment 1 to which the present invention is applied is provided with a plurality of main steel members 63 extending in the circumferential direction Y inside the steel shell 6 and extending in the axial direction X to each main steel member 63. A distribution bar 64 to be contacted is provided. The plurality of main steel materials 63 are intermittently provided at about six locations in the axial direction X, using reinforcing bars such as deformed bars or steel bars.

  As shown in FIG. 13, the distribution bar 64 is provided so as to surround a plurality of main steel members 63 using a reinforcing bar such as a deformed bar or a steel bar. As shown in FIG. 13 (a), the end of the natural ground side Z1 in the normal direction Z may be formed in a hook shape as shown in FIG. 13 (a). And it may be formed so as to surround the main steel material 63 on the inner side Z2 around the entire circumference.

  The segment 1 to which the present invention is applied integrates the plurality of main steel materials 63 with the distribution bars 64, thereby realizing reinforcement of the filling concrete 60 in which the plurality of main steel materials 63 and the distribution bars 64 are embedded. Thus, it is possible to cope with a high load at a large depth applied to the segment 1.

  As shown in FIGS. 14 to 18, the segment 1 to which the present invention is applied is provided with predetermined vertical ribs 65 inside the steel shell 6. The longitudinal rib 65 is made of a substantially flat steel plate, and both end portions in the axial direction X are fixed to the pair of main girders 3 by welding or the like, and a pair of main girders is formed inside the steel shell 6. In the state of being laid on the plate 3, it is embedded in the filling concrete 60.

  The vertical ribs 65 are provided at intermittently about four locations in the circumferential direction Y, with steel plates formed in a substantially flat plate shape extending in the normal direction Z. At this time, the distribution reinforcing bars 64 may be provided separately from the vertical ribs 65 in the circumferential direction Y as shown in FIG. 16, and as shown in FIGS. 17 and 18, both sides of the circumferential direction Y are provided. To the vertical rib 65 may be provided.

  As shown in FIG. 16, the segment 1 to which the present invention is applied is provided with the force distribution bars 64 separated from the vertical ribs 65, so that the space between the plurality of vertical ribs 65 is reinforced by the force distribution bars 64. It is possible to avoid the formation of a portion having a low yield strength in the filling concrete 60. In addition, as shown in FIGS. 17 and 18, the segment 1 to which the present invention is applied is provided with the distribution bars 64 in contact with the vertical ribs 65, so that the main steel material 63, the distribution bars 64, and the vertical ribs are provided. It is possible to provide a highly integrated segment 1 by simply fixing the 65 and the main girder plate 3 together.

  As shown in FIG. 19A, when the reinforcing bars 64 are provided in contact with the vertical ribs 65 from both sides in the circumferential direction Y, a plurality of main steel materials 63 on the natural mountain side Z1 and the inner air side Z2 are provided. By surrounding, the main steel material 63 is sandwiched and restrained in the normal direction Z by the upper and lower ends of the vertical rib 65 and the distribution bar 64. Further, as shown in FIG. 19B, the reinforcing bar 64 is bent at the end in the normal direction Z in the circumferential direction Y, and the bent end of the distributing bar 64 is at the upper end of the vertical rib 65. It may be caught.

  In the segment 1 to which the present invention is applied, a skin plate 5 in which a substantially flat steel plate or the like is curved is provided on the natural mountain side Z <b> 1 so as to cover the inside 6 a of the steel shell 6. At this time, as shown in FIG. 15, the segment 1 to which the present invention is applied is provided such that the upper end portion of the natural mountain side Z <b> 1 of the vertical rib 65 in the normal direction Z is separated from the skin plate 5 in the normal direction Z. Thus, a predetermined gap G is formed between the skin plate 5 and the vertical rib 65.

  In the segment 1 to which the present invention is applied, when a predetermined gap G is formed between the skin plate 5 and the vertical rib 65, the fresh concrete that becomes the filling concrete 60 is filled in the inside 6 a of the steel shell 6. In addition, the fresh concrete can pass through the gap G. At this time, the segment 1 to which the present invention is applied can secure the fluidity of the fresh concrete with the gap G and improve the filling property into the inside 6 a of the steel shell 6.

  Further, in the segment 1 to which the present invention is applied, the skin plate 5 and the vertical rib 65 are separated from each other by forming a predetermined gap G between the skin plate 5 and the vertical rib 65. As shown in FIG. 20, a reinforcing material such as a triangular rib, a square rib, or a trapezoidal rib 66 is appropriately disposed in the vicinity of the joint portion between the skin plate 5 and the main girder plate 3 so as to be near the joint portion. Therefore, the effect of improving the performance of the segment 1 can be expected. Note that the reinforcing members such as the triangular ribs, the square ribs, or the trapezoidal ribs 66 are appropriately disposed regardless of the presence or absence of the vertical ribs 65, so that the performance of the segment 1 can be improved.

  As shown in FIG. 21, the segment 1 to which the present invention is applied has a reinforcing plate 67 that is curved in the circumferential direction Y in accordance with the shape of the segmented steel 2 curved in the circumferential direction Y. 3 is contacted. The reinforcing plate 67 is mainly made of a steel plate or the like formed in a substantially flat plate shape, and a through hole for a segment joint (not shown) is appropriately formed while securing an extension in the circumferential direction Y of about 1 m or more. One side in the direction X is provided in a state of being fixed to the main beam plate 3 by welding or the like.

  The reinforcing plate 67 is brought into contact with one side surface of the main body 20 of the segmented steel 2 formed in a substantially flat shape. At this time, the reinforcing plate 67 may be provided in contact with both the pair of main girders 3 or may be provided in contact with only one of the pair of main girders 3. Further, the reinforcing plate 67 may be provided in contact with either one or both of the pair of joint plates 4.

  The reinforcing plate 67 may be provided over the entire length in the circumferential direction Y of each segment 1 or may be provided only in a predetermined portion in the circumferential direction Y.

  For example, when the segmented steel 2 formed asymmetrically is used as the main girder plate 3, the reinforcing plate 67 is formed in each of the one end side main girder plate 31 and the other end side main girder plate 32 in the axial direction X. Provided on the inner side B. Further, as shown in FIG. 22, when the segmented steel 2 formed in line symmetry is used as the main girder plate 3, the reinforcing plate 67 is either one of the outer side A and the inner side B in the axial direction X or Both are provided in contact with the web 26.

  In addition, as shown in FIG. 23, when the segmented steel 2 formed in line symmetry is used as the main girder plate 3, the reinforcing plate 67 has a normal direction Z of the natural mountain side Z1 and the inner sky side Z2. Either or both may be provided in contact with the flange 25. At this time, as shown in FIG. 23A, the reinforcing plate 67 is provided only on the natural mountain side Z1, for example, or as shown in FIG. 23B, both the natural mountain side Z1 and the inner sky side Z2 are provided. The both ends of the skin plate 5 in the axial direction X may be fixed to the reinforcing plate 67. Further, the reinforcing plate 67 may be provided on both the flange 25 and the web 26 as shown in FIG.

  As shown in FIG. 24, the segment 1 to which the present invention is applied is provided with a reinforcing plate 67 in contact with the segment shape steel 2 that becomes the main beam plate 3 or the like. It is possible to increase the strength of each main beam plate 3 by improving the rigidity in the in-plane direction. In addition, the segment 1 to which the present invention is applied is, as shown in FIG. 24 (a), when an asymmetric segment shape steel 2 is used and a plurality of segments 1 are connected, the segment 1 is located on the inner side B in the axial direction X. Although a reinforcing plate 67 is provided, as shown in FIG. 24C, when combining the asymmetric segment shape steel 2 and the axisymmetric segment shape steel 2, the outer side A of the asymmetric segment shape steel 2 is reinforced. A plate 67 may be provided.

  As shown in FIG. 25, the segment 1 to which the present invention is applied is provided with a reinforcing main girder 68 that extends in the circumferential direction Y by bending or the like inside the steel shell 6. The reinforcing main girder 68 has a substantially H-shaped or a substantially T-shaped cross-section with respect to the circumferential direction Y, and is provided in the middle-filled concrete 60 in a state of protruding from the skin plate 5 to the inside 6a of the steel shell 6. Embedded. The reinforcing main girder 68 is used not only when the segment shape steel 2 formed asymmetrically is used as the main girder plate 3 but also when the segment shape steel 2 formed axisymmetrically is used as the main girder plate 3. Provided.

  As shown in FIG. 25 (a), the reinforcing main girder 68 is made of H-section steel having a substantially H-shaped cross section with respect to the circumferential direction Y, as well as with respect to the circumferential direction Y as shown in FIG. 25 (b). CT section steel having a substantially T-shaped cross section is used. Further, as shown in FIG. 25 (c), the segmented steel 2 or the like whose cross-sectional shape with respect to the circumferential direction Y is substantially the same as each main girder plate 3 may be used as the reinforcing main girder 68.

  As shown in FIGS. 26 (a) and 26 (b), the reinforcing main girder 68 has a web portion 68a extending in the normal direction Z from the skin plate 5 when it has a substantially H shape or a substantially T shape. A flange portion 68b that protrudes on both sides or one side in the axial direction X is formed. At this time, the reinforcing main girder 68 may be provided with a slip-preventing member 61 such as a steel plate whose one end portion in the axial direction X is fixed to the web portion 68a of the reinforcing main girder 68, if necessary. Further, as shown in FIG. 26 (c), when the reinforcing main girder 68 has substantially the same shape as the main girder plate 3, one end portion in the axial direction X is formed in a substantially flat shape of the segmented steel 2. An anti-slip member 61 may be provided that is fixed to one side surface.

  The segment 1 to which the present invention is applied is provided with the reinforcing main girder 68 in the inside 6a of the steel shell 6, thereby realizing reliable load transmission to the reinforcing main girder 68 and corresponding to the wide segment 1. Is possible. In addition, the segment 1 to which the present invention is applied has a displacement preventing member 61 embedded and locked in the inside filled concrete 60 inside the steel shell 6, thereby preventing the displacement between the filled concrete 60 and the steel shell 6. It becomes possible to demonstrate the function. Here, as the slip prevention member 61, a steel plate formed in a substantially flat plate shape is used, and a headed stud or the like is used.

  In addition, the segment 1 to which the present invention is applied includes, as necessary, an inner member 6a of the steel shell 6 shown in FIGS. 8 to 26, a slip prevention member 61, a reinforcing member 62, a main steel material 63, a distribution bar 64, In the state where the vertical rib 65, the trapezoidal rib 66, the reinforcing plate 67, and the reinforcing main girder 68 are appropriately combined, the filling concrete 60 is filled.

  As shown in FIG. 27, the segment 1 to which the present invention is applied has the other end side main girder plate of the other segment 1 connected to the one end side main girder plate 31 of the predetermined segment 1 adjacent to the axial direction X. A plurality of segments 1 are connected to each other by abutting 32.

  As shown in FIG. 27A, the segment 1 to which the present invention is applied has the segment shape steel 2 formed asymmetrically in the axial direction X shown in FIG. By using as substantially the same shape, the plurality of segments 1 are connected to each other.

  Further, the segment 1 to which the present invention is applied is not limited to this. As shown in FIG. 27B, the segment steel 2 formed in line symmetry in the axial direction X shown in FIG. By using each of the plates 3, the plurality of segments 1 may be connected to each other.

  Further, as shown in FIG. 27 (c), the segment 1 to which the present invention is applied includes the segment shape steel 2 formed asymmetrically as shown in FIG. 4 and the segment shape steel 2 formed as axisymmetric as shown in FIG. And a plurality of segments 1 may be connected to each other.

  As shown in FIG. 28, the segment 1 to which the present invention is applied has one end-side main girder plate in a state where the main girder plates 3 of the other segments 1 connected adjacently in the axial direction X are in contact with each other. The fitting convex portion 21 formed on 31 and the fitting receiving portion 22 formed on the other end side main girder plate 32 of the other segment 1 are in the circumferential direction Y at substantially the same position in the normal direction Z. May be formed continuously. At this time, the segment 1 to which the present invention is applied is obtained by unifying the cross-sectional shapes of the main girder plates 3 at both end portions in the axial direction X in each segment 1 connected adjacently in the axial direction X. One type of cross-sectional shape of 3 can be completed.

  As a result, the segment 1 to which the present invention is applied has only one type of cross-sectional shape of the main girder plate 3, so that the production jig can be reduced in the production of the main girder plate 3, and the production cost can be suppressed. . In addition, the segment 1 to which the present invention is applied can unify the orientation of the main beam plate 3 even at the time of assembly, so that it is possible to reduce the material management and the assembly labor at the time of assembly.

  In addition, when the segment shape steel 2 shown in FIG. 7 (b) is adopted as the main girder plate 3, the segment 1 to which the present invention is applied, as shown in FIG. 28 (a), the one end side main girder plate 31 and The other end side main girder plate 32 is arranged point-symmetrically with respect to the center point in the cross section in the circumferential direction Y of the segment 1. At this time, in the segment 1 to which the present invention is applied, the fitting convex portions 21 locked to the filling concrete 60 are arranged at both ends in the normal direction Z, so that the filling concrete 60 is placed in the normal direction Z. The effect of being sandwiched is obtained, and the steel shell 6 and the filled concrete 60 can be integrated more firmly. Furthermore, since the fitting convex portions 21 on the surface that comes into contact with the filling concrete 60 are disposed only at both ends in the normal direction Z of the main girder plate 3, reinforcement of the vertical ribs 65 and the like shown in FIGS. The material can be easily arranged, and the manufacturing cost of the segment 1 can be reduced.

  Here, in the segment 1 to which the present invention is applied, as shown in FIG. 29, the main girder plates 3 are brought into contact with each other at both end portions in the axial direction X, and the fitting convex portion of one main girder plate 3 By fitting 21 into the fitting receiving portion 22 of the other main girder 3, the plurality of segments 1 are connected to each other.

  At this time, in the segment 1 to which the present invention is applied, in particular, the curved fitting convex portion 21 of the one end side main girder plate 31 and the curved fitting receiving portion 22 of the other end side main girder plate 32 are By being formed at substantially the same position in the normal direction Z, the curved fitting convex portion 21 is securely fitted into the fitting receiving portion 22. Further, in the segment 1 to which the present invention is applied, the flat fitting convex portion 21 of the other end side main beam plate 32 is also securely fitted into the flat fitting receiving portion 22 of the one end side main beam plate 31.

  The segment 1 to which the present invention is applied includes a fitting convex portion 21 formed in a curved shape or the like in a shape corresponding to each other by using a segmented steel 2 having a predetermined cross-sectional shape for each main girder 3 The receiving portion 22 is formed on each of the pair of main girders 3 and is securely and firmly fitted. The segment 1 to which the present invention is applied is formed so that the fitting convex portions 21 and the fitting receiving portions 22 of the pair of main girders 3 correspond to each other at substantially the same position in the normal direction Z. By doing so, it becomes possible to improve the integrity of the plurality of segments 1 connected in the axial direction X.

  Further, the segment 1 to which the present invention is applied is formed such that the fitting convex portions 21 and the fitting receiving portions 22 of the pair of main girder plates 3 correspond to each other at substantially the same position in the normal direction Z. As a result of being securely fitted, the assembly of the plurality of segments 1 on site can be easily performed. Furthermore, the segment 1 to which the present invention is applied improves the ease of assembly of the plurality of segments 1 in the field, thereby reliably improving the integrity of the plurality of segments 1, and the plurality of segments 1 connected to each other. High durability in the event of an earthquake can be realized.

  As shown in FIG. 29, the segment 1 to which the present invention is applied is fitted to the filling concrete 60 by using the segment steel 2 shown in FIGS. Either one or both of the convex portion 21 and the fitting receiving portion 22 are also formed on the side surface of the main body portion 20 disposed on the inside 6a side of the steel shell 6. Thereby, the segment 1 to which the present invention is applied is such that the fitting convex portion 21 or the fitting receiving portion 22 is locked to the filling concrete 60 on the inside 6a side of the steel shell 6 so that the inside 6a of the steel shell 6 can be obtained. It is possible to improve the integrity of the filling concrete 60 and the steel shell 6 that are filled in the container.

  The segment 1 to which the present invention is applied is formed on only one side surface where the fitting convex portion 21 and the fitting receiving portion 22 are arranged on the opposite side of the inside 6 a of the steel shell 6 in each main girder plate 3. In addition to this, it is also formed on one of the other side surfaces arranged on the inner side 6 a of the steel shell 6. Thereby, the segment 1 to which the present invention is applied is such that the fitting convex portion 21 and the fitting receiving portion 22 are locked to the filling concrete 60 even on the inside 6 a side of the steel shell 6, so that the inside 6 a of the steel shell 6 is retained. It is possible to improve the integrity of the filling concrete 60 and the steel shell 6 that are filled in the container.

  In addition, the segment 1 to which the present invention is applied has the steel shell 6 and the filled concrete as the fitting convex portion 21 and the fitting receiving portion 22 are locked to the filled concrete 60 even on the inside 6a side of the steel shell 6. 60 is integrated with respect to the normal direction Z, so that the deflection in the normal direction Z of the steel shell 6 with respect to the tunnel external force and the deflection of the filling concrete 60 become substantially the same, and the behavior of the so-called overlap beam structure is ensured. be able to. As a result, the segment 1 to which the present invention is applied has the function of preventing slippage by forming the engaging convex portion 21 and the engaging portion of the engaging receiving portion 22 and the filling concrete 60 continuously in the circumferential direction Y. The rigidity of the material becomes extremely high, and the effect of integration is remarkably enhanced. The segment 1 to which the present invention is applied greatly contributes to the safety of the tunnel structure because the effect of suppressing the filling concrete 60 from being peeled off inside the tunnel can be obtained even when a tunnel external force acts. It becomes.

  Further, as shown in FIG. 4, the segment 1 to which the present invention is applied shares the segment steel 2 formed asymmetrically in the axial direction X with a substantially identical shape in each of the pair of main girders 3. Can be used. As a result, the segment 1 to which the present invention is applied uses the segment shape steel 2 having substantially the same shape as each main girder plate 3 so that the segment shape steel 2 to be the main girder plate 3 can be shared. 1 can be reduced in production cost.

  As shown in FIG. 30, the segment 1 to which the present invention is applied has a main end plate 32 on the other end side of another segment 1 connected adjacently in the axial direction X. A water stop groove 23 that is concave in the axial direction X is formed in a state of being in contact with the girder plate 31.

  The water stop groove 23 is in the normal direction Z from the fitting convex portion 21 or the fitting receiving portion 22 in a state where the one end side main beam plate 31 and the other end side main beam plate 32 are in contact with each other in the axial direction X. Are formed in a concave shape so as to curve in a substantially S-shaped section from the outer side A to the inner side B in the axial direction X.

  As shown in FIG. 30A, the water stop groove 23 is formed so as to be curved in a substantially S-shaped cross section, so that the widened portion 23a that becomes a relatively large gap and the narrow that becomes a relatively small gap. A portion 23b is formed. The water stop groove 23 is a state in which a sealing material 24 made of rubber or the like is fitted into the widened portion 23a before the groundwater pressure is applied from the natural mountain side Z1.

  As shown in FIG. 30 (b), the water stop groove 23 is sealed with the water pressure of the groundwater or the like so that the groundwater pressure is applied from the natural ground side Z1 and the groundwater or the like tries to enter from the natural mountain side Z1 to the inside air side Z2. The material 24 is pressed P. At this time, the sealing material 24 is deformed so as to protrude from the widened portion 23a to the narrowed portion 23b, and is sandwiched so as to be in close contact with the narrowed portion 23b having a relatively small gap.

  The segment 1 to which the present invention is applied is compared in a state after the one end side main girder plate 31 and the other end side main girder plate 32 are in contact with each other in the axial direction X, and the groundwater pressure is applied from the natural mountain side Z1. The sealing material 24 is closely attached to the narrow portion 23b of the small gap. As a result, the segment 1 to which the present invention is applied is capable of remarkably improving the water stop performance at the connection location of the plurality of segments 1 because the intrusion of groundwater or the like is reliably blocked by the closely-sealed sealing material 24. Become.

  Further, the segment 1 to which the present invention is applied has a water stop groove 23 that is continuous in the normal direction Z from the fitting convex portion 21 or the fitting receiving portion 22 and is concave in the axial direction X. It is not necessary to provide the water stop structure in the segment 1. Thereby, the segment 1 to which the present invention is applied can suppress the manufacturing cost of the segment 1 for providing the water stop structure by eliminating the need for an independent water stop structure.

  Further, in the segment 1 to which the present invention is applied, as shown in FIG. 31, the water stop groove 23 is formed independently of the fitting convex portion 21 or the fitting receiving portion 22 and is adjacent to the axial direction X. The width of the sealing material 24 can be freely selected when formed in substantially the same position in the normal direction Z with the water stop grooves 23 of the other segments 1 connected together. Since two sealing materials 24 adjacent to X overlap and resist groundwater pressure, high water stopping performance can be exhibited. At this time, the segment 1 to which the present invention is applied has a water stop groove 23 that is concave on both side surfaces of the main body 20 in the axial direction X, and a water stop groove 23 that is concave on the outer side A of the main body 20. The water stop grooves 23 that are concave on the inner side B of the main body 20 may be formed at substantially the same position in the normal direction Z. In the segment 1 to which the present invention is applied, by providing the water stop grooves 23 on both sides, not only the integrity of the inside B water stop grooves 23 with the filling concrete 60 is dramatically improved, but also the main girder The shape of the plate 3 is symmetrical, and the production efficiency is dramatically improved. At the same time, it is possible to use the function of preventing slippage instead of the water stop function.

  Here, the segment ring 70 in which the plurality of segments 1 shown in FIG. 1 are connected in a ring shape in the circumferential direction Y and the other segment ring 70 connected adjacent to each other in the axial direction X are as shown in FIG. In addition, the fitting convex portions 21 and the fitting receiving portions 22 are fitted to each other over substantially the entire circumference in the circumferential direction Y of each segment ring 70.

  Further, each segment ring 70 connected adjacently in the axial direction X is formed with a water stop groove 23 that is concave in the axial direction X. Further, as shown in FIG. 30, the water stop groove 23 is provided with a gap in which the sealing material 24 can expand in a watertight manner with respect to the axial direction X. Also in the portion continuous with Z, the fitting convex portion 21 and the fitting receiving portion 22 are fitted to each other in the normal direction Z.

  Thus, as shown in FIG. 1, the segment 1 to which the present invention is applied is formed by fitting the segment rings 70 in which a plurality of segments 1 are assembled in a ring shape over the entire length in the circumferential direction Y, as shown in FIG. As shown in FIG. 3, the water stop groove 23 is provided with a gap that extends in a watertight manner. Further, as shown in FIG. 30, a sealing material 24 is attached to the water stop groove 23. When an earthquake occurs, the tunnel 7 deforms following the deformation of the ground, so that the tunnel 7 itself expands and contracts in the axial direction X or shifts in the normal direction Z. When the tunnel 7 itself extends in the axial direction X, the force that causes the mesh opening 70 acts between the segment rings 70, so that stress concentrates on the segment 1, and surrounding earth and sand and groundwater are removed from the gap of the mesh opening. Try to invade.

  The segment 1 to which the present invention is applied is provided with a watertightly expanding gap in the water stop groove 23, so that when the force for opening the aperture acts, the segment 1 behaves so as to widen. 1 is relaxed. Even if a mesh opening occurs, as shown in FIG. 30, water can be stopped by the sealing material 24 provided in two stages, so that intrusion of surrounding earth and sand and groundwater can be prevented. Further, as shown in FIG. 1, the strength of the tunnel 7 is high because the strong segment ring 70 resists the surrounding soil water pressure. Further, even when the segment rings 70 are displaced in the normal direction Z due to deformation of the ground around the tunnel 7, the fitting convex portion 21 and the fitting receiving portion 22 shown in FIG. 70 does not come off.

  The segment 1 to which the present invention is applied is used as any one of a reinforced concrete segment reinforced with a steel shell 6, a concrete-filled steel segment, a simple synthetic segment, and a synthetic segment. At this time, as shown in FIG. 32, the segment 1 to which the present invention is applied is provided with a displacement preventing member 61 in the inside 6a of the steel shell 6, and the displacement preventing performance against the displacement between the steel shell 6 and the concrete is variable. Can be integrated as appropriate. In general, a steel concrete segment composed of a steel shell 6 and concrete has a reinforced concrete segment reinforced with a steel shell 6, a concrete-filled steel segment, a simple composite segment, Classified as a synthetic segment. This classification is properly used depending on the required performance for the tunnel 7 and the segment 1. However, the segment 1 to which the present invention is applied can be freely set to any type of classification by appropriately providing the displacement preventing member 61. Therefore, rational design is possible, and the cost of segment 1 can be optimized.

  The segment 1 to which the present invention is applied is continuous over the circumferential direction Y in a state in which the displacement preventing member 61 in the normal direction Z that exhibits displacement preventing performance in the normal direction Z is curved along the main girder plate 3. Provided. In addition, the segment 1 to which the present invention is applied has a circumferential direction Y displacement preventing member 61 that exhibits displacement prevention performance in the tangential direction (circumferential direction Y) intermittently provided in the circumferential direction Y. The main girder 3 is arranged at about four locations in the circumferential direction Y.

  At this time, the segment 1 to which the present invention is applied can be separately provided with a detent member 61 that exhibits detent performance with respect to the normal direction Z and the tangential direction (circumferential direction Y). And since the slip prevention member 61 with respect to the normal direction Z needs to transmit the earth-water pressure which acts from the surrounding ground reliably, the steel shell 6 and concrete must be firmly integrated, the circumferential direction Y It becomes possible to transmit a load reliably by installing continuously over. On the other hand, the tangential direction (circumferential direction Y) detent member 61 distributes the load to the steel shell 6 and the concrete in the process of further transmitting the load transmitted from the ground in the circumferential direction Y. Fulfill. For this reason, the tangential direction (circumferential direction Y) anti-slip member 61 is provided intermittently over the peripheral direction Y at appropriate locations, so that the segment 1 according to the load resistance performance required in each classification of the segment 1 is provided. It is possible to rationally configure the performance.

  As shown in FIGS. 3 to 7, the segment 1 to which the present invention is applied includes a segmented section steel 2 having a predetermined cross-sectional shape for each main beam plate 3, and a fitting convex portion 21 and a fitting receiving portion. By forming 22, the rigidity in the out-of-plane direction and the in-plane direction of each main beam plate 3 is improved. Thereby, the segment 1 to which the present invention is applied can improve the rigidity in the out-of-plane direction and the in-plane direction of each main girder plate 3 and increase the strength of each main girder plate 3. .

  As shown in FIG. 2, the segment 1 to which the present invention is applied is similar to the main girder plate 3, and the segment shape steel 2 formed with a predetermined cross-sectional shape is connected to each joint plate 4 as necessary. It may be used as Each joint plate 4 uses the segmented steel 2 shown in FIGS. 6 and 7, so that the fitting convex portion 21 of the one end side joint plate 41 arranged on one end side in the circumferential direction Y and the circumferential direction Y The fitting receiving portion 22 of the other end side joint plate 42 disposed on the other end side is formed continuously in the axial direction X at substantially the same position in the normal direction Z.

  Thereby, the segment 1 to which the present invention is applied is formed in a shape in which the fitting convex portions 21 and the fitting receiving portions 22 of the pair of joint plates 4 correspond to each other at substantially the same position in the normal direction Z. By doing so, it becomes possible to improve the integrity of the plurality of segments 1 connected in the circumferential direction Y. In addition, the segment shape steel 2 formed by predetermined | prescribed cross-sectional shape may be used for the segment 1 to which this invention is applied, for example only in either the main beam board 3 or the joint board 4. FIG.

  As shown in FIG. 1, the segment 1 to which the present invention is applied particularly uses the segment steel 2 having a predetermined cross-sectional shape in both the pair of main girders 3 and the pair of joint plates 4. In addition, the plurality of segments 1 are integrally connected in the axial direction X and the circumferential direction Y. At this time, in the segment 1 to which the present invention is applied, the plurality of segments 1 are integrally connected in the circumferential direction Y to construct the segment ring 70 and the plurality of segment rings 70 are integrally connected in the axial direction X. As a result, the tunnel 7 is constructed.

  Here, as shown in FIG. 2, the segment 1 generally needs to perform various processes such as cutting, cutting, bending, and welding of steel plates and section steels in the assembly process of a plurality of members. is there. And although the segment 1 needs to keep the dimensional accuracy such as width, height, twist, and bend within an allowable range as a processed product, the strength and components of each member are different. The management of accuracy was based on experience and was extremely difficult.

  In particular, the main girder 3 of the segment 1 is a main member when resisting an external load such as soil water pressure, and is disposed on the outer periphery of the steel shell 6 of the segment 1, so that the quality and dimensional accuracy are high. Is required. Therefore, as shown in FIGS. 6 and 7, the segment 1 to which the present invention is applied has a deviation Δ between the centroid position and the center of gravity position of 8 with respect to the total height H or the total width W of the segment shape steel 2 in particular. % Or less, the centroid position and the center of gravity position substantially coincide.

  Here, if the amount of deviation Δ in the axial direction X (normal direction Z) between the centroid position and the center of gravity position of the main girder plate 3 is large, deformation such as warpage and torsion associated with bending or welding increases. It becomes difficult to ensure the required dimensional accuracy of the segment 1. On the other hand, if the overall width W (total height H) in the axial direction X (normal direction Z) of the main girder plate 3 is large, the rigidity of the main girder plate 3 increases, and deformation such as warping and twisting associated with bending or welding. It becomes easy to ensure the required dimensional accuracy of the segment 1.

  When the deviation amount Δ between the centroid position and the center of gravity position with respect to the total height H or the full width W is adopted as an index indicating the manufacturing difficulty, the larger the deviation Δ is, the more the warping occurs, and the torsional deformation becomes larger, which increases the manufacturing difficulty. As shown in FIG. 33, the inventor of the present invention can ensure a high level of quality and dimensional accuracy with simple correction if the deviation Δ is 8% or less, based on various production results so far. It has been found that if the deviation amount Δ is 3% or less, it is possible to ensure a higher level of quality and dimensional accuracy without the need for correction. If the deviation amount Δ exceeds 8%, it will be extremely difficult to ensure the required dimensional accuracy by normal correction, and processing with a large-scale jig will be required, which will greatly increase the assembly processing cost. become.

  As a result, the segment 1 to which the present invention is applied has only a significant reduction in the assembly work of the segment shape steel 2 because the centroid position and the center of gravity position substantially coincide with each other in the cross-sectional direction of the segment shape steel 2. In addition, a high level of quality and dimensional accuracy can be ensured. The segment 1 to which the present invention is applied can ensure a higher level of quality and dimensional accuracy, particularly when the deviation Δ between the centroid position and the center of gravity position of the segment shape steel 2 is 3% or less. It becomes possible.

  The basic idea of the segment 1 to which the present invention is applied is to set the relative rigidity in the normal direction Z to be relatively large so as to avoid extreme risks such as tunnel collapse. 9 is to provide a tunnel segment structure that appropriately resists an external force acting on a tunnel by appropriately providing a tunnel tangential shift member 61 and the like shown in FIG. Furthermore, in addition to this basic idea, by forming the fitting convex portion 21 and the fitting receiving portion 22 continuous in the circumferential direction Y on the main beam plate 3, not only the fitting function and the water stopping function but also the slip prevention. It is possible to achieve the function at the same time. In addition, the low-cost and multi-functionality can be made compatible by devising the arrangement of the concave and convex shapes of the main girder plate 3 in order to manufacture at a low cost.

  As shown in FIG. 29, the segment 1 to which the present invention is applied has a gap between the segment rings 70, so that the stress in the tunnel does not concentrate because the axial direction X is a flexible structure and looks like a bellows. . However, since the segment ring 70 can resist the external pressure, the strength is high. Moreover, since the water can be fitted and stopped in the normal direction Z, water leakage can be prevented, and the durability of the tunnel is improved.

  As shown in FIG. 32, the segment 1 to which the present invention is applied is a reinforced concrete segment reinforced with a steel shell 6 by appropriately installing a slip-preventing member 61 according to the load acting on the tunnel 7. Since it can be configured as a stuffed steel segment, a simple synthetic segment, or a synthetic segment, rational design is possible and segment 1 with reasonable structural specifications can be provided, so the cost of segment 1 can be optimized. become.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be interpreted in a limited way.

1: Segment 2: Segment shape steel 2a: Curved surface 2b: Flat surface 20: Main body portion 20a: One side surface 20b: Other side surface 21: Fitting convex portion 22: Fitting receiving portion 23: Water stop groove 23a: Widening portion 23b : Narrow portion 24: sealing material 25: flange 26: web 3: main girder plate 31: one end side main girder plate 32: other end side main girder plate 4: joint plate 41: one end side joint plate 42: other end side joint plate 5: Skin plate 6: Steel shell 6a: Inside 60: Filled concrete 61: Non-slip member 62: Reinforcement member 63: Main steel material 64: Distribution bar 65: Vertical rib 66: Trapezoid rib 67: Reinforcement plate 68: Reinforcement main Girder 68a: Web portion 68b: Flange portion 7: Tunnel 70: Segment ring A: Outer side B: Inner side X: Axial direction Y: Circumferential direction Z: Normal direction

Claims (21)

A segment where a tunnel is constructed by connecting multiple,
A pair of main girders arranged at both ends in the axial direction of the tunnel and a pair of joint plates arranged at both ends in the circumferential direction of the tunnel, and a pair of steel shells filled with filled concrete inside Formed by being surrounded by the main girder plate and the pair of joint plates,
The pair of main girder plates are one end side main girder plate that becomes the main girder plate arranged on one end side in the axial direction of the tunnel, and the main girder plate arranged on the other end side in the axial direction of the tunnel; The other end side main girder plate is formed with a main body portion extending in the normal direction of the tunnel, and a fitting convex portion protruding from the main body portion in the tunnel axial direction is formed on the one end side main girder plate. A fitting receiving portion that is recessed from the main body portion in the axial direction of the tunnel is formed on the other end side main beam plate, and the fitting convex portion formed on the one end side main beam plate and the other end side main portion. The segment characterized in that the fitting receiving portion formed on the girder plate is continuously formed in the circumferential direction of the tunnel at substantially the same position in the normal direction of the tunnel. Each of the main girders is formed on the inner side of the steel shell in the axial direction of the tunnel, either or both of the fitting convex portion and the fitting receiving portion locked to the filling concrete. The segment of claim 1, wherein: Each of the main girders has the fitting projection formed on one side surface of the main body portion, the fitting convex portion and the fitting receiving portion being formed on both side surfaces of the main body portion in the axial direction of the tunnel. The segment according to claim 1, wherein the fitting portion and the fitting receiving portion formed on the other side surface of the main body portion are formed at substantially the same position in the normal direction of the tunnel. Each main girder plate is a stop that is concave from the outside in the axial direction of the tunnel to the inside in a state where the main girder plates of other segments connected adjacent to each other in the axial direction of the tunnel are in contact with each other. The segment according to any one of claims 1 to 3, wherein the water groove is formed continuously from the fitting convex part or the fitting receiving part in a normal direction of the tunnel. Each main girder is formed with the fitting convex part and the fitting receiving part on the main body so that the centroid position and the gravity center position substantially coincide with each other in the cross-sectional direction with respect to the circumferential direction of the tunnel. The segment according to any one of claims 1 to 4, wherein: The one end side main girder plate and the other end side main girder plate are formed in a circumferential cross section of the segment while the fitting convex portion and the fitting receiving portion are formed outside the steel shell in the axial direction of the tunnel. The segment according to any one of claims 1 to 5, wherein the segments are arranged symmetrically with respect to the center point. The segment according to any one of claims 1 to 6, wherein a displacement preventing member is provided in which one end of the tunnel in the axial direction is fixed to each of the main girders inside the steel shell. The segment according to any one of claims 1 to 7, wherein a reinforcing member is provided in which both end portions in the axial direction of the tunnel are fixed to the pair of main girder plates inside the steel shell. A plurality of main steel members extending in the circumferential direction of the tunnel are provided inside the steel shell, and distribution bars are provided that extend in the axial direction of the tunnel and come into contact with the main steel members. Item 9. The segment according to any one of Items 1 to 8. Inside the steel shell, there are provided substantially flat plate-like vertical ribs in which both ends in the axial direction of the tunnel are fixed to the pair of main girders, and distribution bars extending in the axial direction of the tunnel are provided on the vertical ribs. The segment according to any one of claims 1 to 9, wherein the segment is provided so as to abut or to be separated from the longitudinal rib in the circumferential direction of the tunnel. Inside the steel shell, a substantially flat vertical rib whose both ends in the axial direction of the tunnel are fixed to the pair of main girders is either or both of the natural ground side and the inner air side in the normal direction of the tunnel. The segment according to any one of claims 1 to 10, wherein the segment is provided so as to be separated from the skin plate provided in the direction of the normal line of the tunnel. The segment according to any one of claims 1 to 11, wherein the main girder plate is in contact with a reinforcing plate extending in a circumferential direction of the tunnel. The segment according to any one of claims 1 to 12, wherein a reinforcing main girder extending in a circumferential direction of the tunnel is provided inside the steel shell. 14. The segment according to claim 13, wherein the reinforcing main girder is provided so as to have a substantially H-shaped or a substantially T-shaped cross-sectional shape with respect to the circumferential direction of the tunnel and project inside the steel shell. The segment according to claim 13, wherein the reinforcing main girder is provided so that a cross-sectional shape with respect to a circumferential direction of the tunnel is substantially the same as each main girder plate and protrudes into the steel shell. . The segment according to any one of claims 13 to 15, wherein the reinforcing main girder is provided with a displacement preventing member in which one end portion in the axial direction of a tunnel is fixed to the reinforcing main girder. A segment where a tunnel is constructed by connecting multiple,
A pair of main girders arranged at both ends in the axial direction of the tunnel and a pair of joint plates arranged at both ends in the circumferential direction of the tunnel, and a pair of steel shells filled with filled concrete inside Formed by being surrounded by the main girder plate and the pair of joint plates,
The pair of joint plates are one end side joint plate which is the joint plate disposed on one end side in the circumferential direction of the tunnel, and the other end side which is the joint plate disposed on the other end side in the circumferential direction of the tunnel. A main body portion extending in the normal direction of the tunnel is formed on the joint plate, and a fitting convex portion protruding from the main body portion in the circumferential direction of the tunnel is formed on the one end side joint plate and from the main body portion to the tunnel. The fitting receiving portion that is depressed in the circumferential direction is formed on the other end side joint plate, and the fitting convex portion formed on the one end side joint plate and the fitting formed on the other end side joint plate The segment is characterized in that the receiving portion is continuously formed in the tunnel axial direction at substantially the same position in the normal direction of the tunnel. A segment ring in which a plurality of the segments are connected in a ring shape in the circumferential direction of the tunnel and another segment ring connected adjacent to each other in the axial direction of the tunnel are substantially all in the circumferential direction of each segment ring. The segment according to any one of claims 1 to 17, wherein the fitting convex portion and the fitting receiving portion are fitted to each other over a circumference. Each of the segment rings connected adjacent to each other in the axial direction of the tunnel is formed with a water stop groove that is concave from the outside in the axial direction of the tunnel to the inside.
The water stop groove is provided with a gap that can expand in a watertight manner with respect to the axial direction of the tunnel, and the fitting convex portion and the fitting receiving portion are also in the normal direction of the tunnel even in the watertight expansion. The segments of claim 18, wherein the segments are fitted together. The segment is any one of a reinforced concrete segment reinforced with a steel shell, a concrete-filled steel segment, a simple synthetic segment, and a synthetic segment. Segments. The segment is characterized in that the normal-direction detent member of the tunnel is continuously provided along the circumferential direction of the tunnel, and the detent member in the tangential direction of the tunnel is provided intermittently along the circumferential direction of the tunnel. The segment according to any one of claims 1 to 20.

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