JP2017106306A - 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.

  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. An object of the present invention is to provide a segment capable of enhancing integration and improving the integrity of a plurality of segments connected to each other and reducing the manufacturing cost.

  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 formed continuously in the circumferential direction of the tunnel at a position, and is installed on both the pair of main girder plates or the anti-slip member fixed to one of the pair of main girder plates inside the steel shell. A reinforcing member is provided.

  The segment according to a second aspect of the present invention is the segment according to the first aspect, wherein the slip prevention member is provided on the skin plate and the main girder plate provided on either or both of the natural ground side and the inner sky side in the normal direction of the tunnel. A reinforcing material to be fixed, or a reinforcing bar, a steel plate, a shape steel, a headed stud, or a U-shaped gibber that is not fixed to the skin plate is used.

  The segment according to a third aspect of the present invention is the segment according to the first aspect, wherein the shift preventing member uses an L-shaped gibber bent in a substantially L shape, and one side that becomes a part of the L-shaped gibber is the main girder. While being fixed to the plate, a distribution bar extending in the axial direction of the tunnel is connected to the other side which is the remaining portion of the L-shaped dowel.

  The segment according to a fourth invention is the segment according to the first invention, wherein the shift preventing member is a deformed U-shaped gibber bent in a substantially U-shape, and a part of the deformed U-shaped gibber is a tunnel method. A distribution bar which is fixed to the main plate and the skin plate provided on either or both of the natural mountain side and the inner sky side in the linear direction and extends in the axial direction of the tunnel to the remaining portion of the deformed U-shaped gibber. Are connected.

  The segment according to a fifth aspect of the present invention is the first aspect of the invention, wherein the shift preventing member is a complex deforming gibber in which a substantially U-shaped bent portion and a substantially S-shaped bent portion are formed. A part of the composite deformation gibber is fixed to the skin plate and the main girder plate provided on either or both of the natural mountain side and the inner sky side in the normal direction of the tunnel, and the remaining part of the composite deformation gibber A distribution bar extending in the axial direction of the tunnel is connected to the frame.

  The segment according to a sixth aspect of the present invention is the segment according to any one of the second to fifth aspects, wherein the shift preventing member is fixed to each of the one end side main beam plate and the other end side main beam plate. The both ends of the force distribution bars extending in the axial direction of the tunnel are connected to the pair of detent members.

  The segment according to a seventh aspect of the present invention is the segment according to any one of the second to sixth aspects, wherein the anti-slip member comprises a plurality of the anti-slip members separated by a predetermined separation distance in the circumferential direction of the tunnel. Provided inside, the separation distance on the center side in the circumferential direction of the tunnel is smaller than the separation distance on both ends in the circumferential direction of the tunnel.

  The segment according to an eighth aspect of the present invention is the segment according to the first aspect, wherein the reinforcing member is a reinforcing bar, a steel plate, or a section steel in which both ends in the axial direction of the tunnel are fixed to the pair of main girder plates. .

  According to a ninth aspect of the present invention, in the first aspect, the reinforcing member includes a substantially flat plate-shaped vertical rib in which both end portions in the axial direction of the tunnel are fixed to the pair of main girder plates. It is characterized in that a notch portion is formed in which the lower end portion of the vertical rib is arranged on the natural mountain side in the normal direction of the tunnel, in the center side rather than the both end sides in the direction.

  The segment according to a tenth aspect of the present invention is the segment according to the ninth aspect, wherein the longitudinal rib is formed so that the notch portion extends substantially linearly in the axial direction of the tunnel and is substantially tapered from the notch portion to both end portions. It is characterized by being formed.

  The segment according to an eleventh aspect of the invention is the ninth aspect or the tenth aspect of the invention, wherein the vertical ribs are a natural ground side vertical rib on the natural ground side in the normal direction of the tunnel and an internal air side on the internal air side in the normal direction of the tunnel. A vertical rib is also provided, and the natural mountain side vertical rib and the inner space side vertical rib are spaced apart from each other in the normal direction of the tunnel.

  A segment according to a twelfth aspect of the present invention is the segment according to any one of the ninth to eleventh aspects, wherein the vertical rib is cut out at a corner on the natural mountain side in the normal direction of the tunnel.

  The segment according to a thirteenth invention is the segment according to any one of the eighth to twelfth inventions, wherein the reinforcing member includes a plurality of the reinforcing members separated by a predetermined separation distance in the circumferential direction of the tunnel inside the steel shell. It is provided, The said separation distance in the center side of the circumferential direction of a tunnel is smaller than the said separation distance in the both ends of the circumferential direction of a tunnel, It is characterized by the above-mentioned.

  A segment according to a fourteenth aspect of the present invention is the skin according to any one of the first to thirteenth aspects, wherein the skin is provided on either or both of the natural mountain side and the inner air side in the normal direction of the tunnel in the steel shell. The plate is fixed with an S-shaped diver that is bent in a substantially S-shape inclined in the normal direction of the tunnel.

  According to 1st invention-14th 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. In addition, segment steel with a predetermined cross-sectional shape is used for each main beam plate, and a fitting convex portion and a fitting receiving portion are formed, so that the out-of-plane direction and the in-plane direction of each main beam plate As a result, the rigidity of each main girder can be increased.

  In particular, according to the second to seventh inventions, 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, and the filling concrete and steel It is possible to exert the function of preventing the shell from shifting. Further, by connecting the distribution bar to the slip prevention member, it is possible to further increase the strength of the segment at low cost without requiring high cutting accuracy for the distribution bar.

  In particular, according to the eighth to thirteenth inventions, a predetermined reinforcing member is provided inside the steel shell, and the reinforcing member is erected, so that the high strength of the filling concrete and the main girder plate are improved. Realizing reliable load transmission, it is possible to cope with wide segments.

  In particular, according to the seventh and thirteenth inventions, although the center side in the circumferential direction of each main girder plate is greatly deflected easily, a plurality of displacement preventing members or reinforcing members are provided on the center side in the circumferential direction of the main girder plate. By being densely provided, the central side of the main girder plate in the circumferential direction is reinforced and the bending thereof is prevented, and the dimensional accuracy in the axial direction of the segment is improved, resulting in a high-quality segment. It is possible to increase the strength of the entire tunnel arranged in a staggered pattern. Furthermore, since the thickness of the segment can be reduced, the tunnel outer diameter can be reduced, the construction site can be reduced, the tunnel excavation amount can be reduced, and the tunnel construction period can be reduced.

  In particular, according to the fourteenth invention, the S-shaped gibber inclined in the normal direction of the tunnel is fixed to the skin plate, so that the integration of the filling concrete and the steel shell is enhanced, and the high strength of the segment is possible. It becomes. Furthermore, it is possible to increase the effective load resistance of the skin plate against the external load to enhance the load resistance performance of the segment, and to effectively improve the shear reinforcement performance of the concrete against the external load.

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 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 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. It is a front view of the circumferential direction which shows the slip prevention member of the U-shaped dowel provided in the segment to which this invention is applied. It is the front view of the circumferential direction which shows the distribution line connected with the slip prevention member of the U-shaped gibber provided in the segment to which this invention is applied. (A) is a side view which shows arrangement | positioning of a trapezoid rib by the segment to which this invention is applied, (b) is the front view of the circumferential direction. (A) is a side view which shows arrangement | positioning of a substantially hexagonal rib with the segment to which this invention is applied, (b) is the front view of the circumferential direction. It is the front view of the circumferential direction which shows the power distribution line connected with the slip prevention member of the trapezoid rib provided in the segment to which this invention is applied. (A) is a front view which shows the slip prevention member fixed to the main beam board of the segment shape steel formed asymmetrically by the segment to which this invention is applied, (b) is the segment formed in line symmetry It is a front view which shows the slip prevention member fixed to the main girder board of a shape steel. It is a front view which shows the L-shaped dowel provided in the segment to which this invention is applied. It is a front view which shows the deformation | transformation U-shaped dowel provided in the segment to which this invention is applied. It is a front view which shows the compound deformation | transformation dowel provided in the segment to which this invention is applied. (A) is a side view showing a plurality of displacement preventing members with a small separation distance on the center side in a segment to which the present invention is applied, and (b) is a bottom view thereof. (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 provided in the segment to which this invention is applied, (b) is the bottom view. It is a front view which shows the vertical rib in which the notch part was formed in the segment to which this invention is applied. It is a front view which shows the vertical rib which mutually separated the natural ground side vertical rib and the inner space side vertical rib in the normal line direction by the segment to which this invention is applied. It is a front view which shows the vertical rib by which the corner part was notched by the segment to which this invention is applied. (A) is a side view which shows the some reinforcement member which made the separation distance small in the center side in the segment to which this invention was applied, (b) is the bottom view. (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 a front view which shows the S character dowel provided in the segment to which this invention is applied. 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. 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 the bottom view which shows the main girder which the center side of the circumferential direction becomes large and is easy to bend in the segment to which this invention is applied, (b) is a schematic plane which shows the several segment arrange | positioned in substantially zigzag form FIG. 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 FIG. 8, the segment 1 to which the present invention is applied is provided with a plurality of main steel materials 63 extending in the circumferential direction Y inside the steel shell 6 and extending in the axial direction X to each main steel material. A distribution bar 64 is provided in contact with 63. The plurality of main steel members 63 are provided intermittently at about six locations in the axial direction X, using reinforcing bars such as deformed bars or deformed bars.

  As shown in FIG. 9, the reinforcing bars 64 are provided so as to surround a plurality of main steel members 63 using reinforcing bars such as deformed bars or deformed bars. At this time, as shown in FIG. 9 (a), the distribution reinforcing bars 64 may be formed in a hook shape at the end of the natural ground side Z1, and as shown in FIG. 9 (b), The main steel material 63 of the empty side Z2 may be formed so as to surround 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.

  The segment 1 to which the present invention is applied is provided with an anti-displacement member 61 fixed to one of the pair of main girders 3 as shown in FIGS. 10 to 21 inside the steel shell 6. As shown in FIGS. 22 to 27, the segment 1 to which the present invention is applied may be provided with a reinforcing member 62 that is installed on both the pair of main girders 3 inside the steel shell 6. At this time, the segment 1 to which the present invention is applied is provided with either one or both of the displacement preventing member 61 and the reinforcing member 62.

  Here, as shown in FIGS. 10 to 21, the slip preventing member 61 has only one end portion in the axial direction X fixed to each main beam plate 3 by welding or the like, and the other end in the axial direction X. One end of the steel shell 6 extends into the inside 6 a and is embedded in the filling concrete 60.

  As shown in FIGS. 10 to 13, the displacement preventing member 61 is partially fixed to each main girder plate 3 by welding or the like, but is not fixed to the skin plate 5 by welding or the like. Shaped steel, headed studs or U-shaped gibbles are used.

  As shown in FIG. 10, the slip prevention member 61 uses a headed stud, and as shown in FIG. 11, 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. The slip prevention member 61 is not limited to a headed stud and a steel plate, and a rebar such as a deformed reinforcing bar or a deformed steel bar, or a shaped steel such as an H-shaped steel, a grooved steel or an angle steel. As shown in FIGS. 12 and 13, a U-shaped gibber obtained by bending a reinforcing bar into a substantially U shape may be used as the slip prevention member 61 as needed.

  The non-slip member 61 protrudes into the inner part 6a of the steel shell 6 in a state where the remaining part 61b such as a U-shaped gibber is not fixed to the skin plate 5 by fixing a part 61a such as a U-shaped gibber to the main girder plate 3. Arranged. The slip-off preventing member 61 has a remaining portion 61b such as a U-shaped diver embedded and locked in the filling concrete 60, and a portion 61a such as a U-shaped gibber is fixed to the main girder plate 3 so It is possible to exert a function of preventing the displacement between the steel 60 and the steel shell 6.

  It is desirable that the shift preventing member 61 is provided in a pair in the axial direction X by being fixed to each of the one end side main beam plate 31 and the other end side main beam plate 32. At this time, as shown in FIGS. 12 (b) and 13, the stopper member 61 is connected to each of the pair of stopper members 61 at both ends of the reinforcing bars 64 such as reinforcing bars extending in the axial direction X. May be.

  The displacement preventing member 61 is provided with a distribution bar 64 on either one or both of the inner space side Z2 and the natural mountain side Z1, and both ends of the distribution bar 64 are tightly connected by welding joint, wire, or the like. Only connected in a state. Further, as shown in FIG. 13A, the slip prevention member 61 has both end portions of the distribution bars 64 on the inner space side Z2 or the natural mountain side Z1 on one side of the remaining portion 61b such as a U-shaped dowel. In addition to being connected, as shown in FIG. 13 (b), both ends of the distribution bars 64 on the inner air side Z2 and the ground mountain side Z1 are connected to both the pair of remaining portions 61b such as a U-shaped gibber. Also good. For example, as shown in FIG. 12B, the slip prevention member 61 is connected to both of a pair of remaining portions 61 b such as a U-shaped dowel so that both ends of the force distribution bars 64 are constructed. May be.

  As shown in FIGS. 14 and 15, the slip prevention member 61 uses a reinforcing material 66 such as a triangular rib, a square rib, a trapezoidal rib, or a substantially hexagonal rib fixed to the skin plate 5 and the main girder plate 3. May be. The slip prevention member 61 is formed when a predetermined gap G is formed between the skin plate 5, the main girder plate 3 and the reinforcing material 66 to fill the inside 6 a of the steel shell 6 with the fresh concrete that becomes the filling concrete 60. The fresh concrete can pass through the gap G. And the slip prevention member 61 suppresses a deformation | transformation of the skin plate 5 by the placement pressure of fresh concrete because the reinforcing material 66 adheres to the skin plate 5 and the main girder board 3. As shown in FIG.

  Even when a reinforcing member 66 such as a triangular rib, a square rib, a trapezoidal rib, or a substantially hexagonal rib is used for the slip preventing member 61, as shown in FIG. 66 may be connected. At this time, as shown in FIGS. 16 (a) and 16 (b), the slip prevention member 61 is welded to the skin plate 5 as shown in FIG. A flat steel or the like fixed by, for example, may be used as the distribution bar 64 that improves the rigidity of the skin plate 5.

  As shown in FIG. 17 (a), the displacement preventing member 61 is fixed to the side face of the main body 20 of each main beam plate 3 in the main beam plate 3 of the segmented steel 2 formed asymmetrically. If necessary, it is fixed to the skin plate 5. Further, as shown in FIG. 17 (b), the displacement preventing member 61 is fixed to the web 26 of each main beam plate 3 in the main beam plate 3 of the segment shape steel 2 formed in line symmetry. And the slip prevention member 61 is fixed to the flange 25 on the ground plate side Z1 or the inner space side Z2 of the skin plate 5 or each main girder plate 3 as required.

  As shown in FIG. 18 (a), an L-shaped gibber 81 bent in a substantially L-shape is used for the slip-off preventing member 61, and one side that becomes a part 61 a of the L-shaped gibber 81 is on the main girder plate 3. It may be fixed to. And as shown in FIG.18 (b), even if the distribution | strution reinforcement 64 extended in the axial direction X is connected with the other side used as the remaining part 61b of the L-shaped dowel 81 as the slip prevention member 61 is shown in FIG.18 (b). Good.

  Further, as shown in FIG. 19A, the shift preventing member 61 may be a deformed U-shaped dowel 82 that is bent into a substantially U-shape and has an inclined portion. At this time, a part 61a of the deformed U-shaped gibber 82 is fixed to the skin plate 5 and the main girder plate 3 provided on either one or both of the natural mountain side Z1 and the inner air side Z2 on both sides of the inclined portion. May be. Further, as shown in FIG. 19B, the slip preventing member 61 is connected to a remaining portion 61b extending in the axial direction X of the deformed U-shaped gibber 82 with a distribution bar 64 extending in the axial direction X as necessary. May be. Note that the force distribution bars 64 connected to the deformed U-shaped gibber 82 may be fixed to the skin plate 5 on one or both of the natural mountain side Z1 and the inner air side Z2 as necessary.

  Further, as shown in FIG. 20A, the slip preventing member 61 is a composite deformation formed such that each of the substantially U-shaped bent portion and the substantially S-shaped bent portion has an inclined portion. A gibber 83 may be used. At this time, the part 61a of the complex deformation dowel 83 is a substantially U-shaped bent portion and a substantially S-shaped bent portion, respectively, on either one or both of the natural mountain side Z1 and the inner air side Z2. It may be fixed to the provided skin plate 5 and main girder plate 3. And as shown in FIG.20 (b), the slip prevention member 61 is a force distribution line | wire extended in the axial direction X to the substantially S-shaped bending part used as the remaining part 61b of the compound deformation | transformation dowel 83 as needed. 64 may be connected.

  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 FIG. 21, the slip preventing member 61 is provided with a plurality of slip preventing members 61 separated from each other in the circumferential direction Y by a predetermined spacing distance d in the inside 6 a of the steel shell 6. The slip preventing member 61 has a separation distance d1 at the center side in the circumferential direction Y in the inside 6a of the steel shell 6 that is larger than the separation distances d2 and d3 at both ends in the circumferential direction Y in the inside 6a of the steel shell 6. It is desirable to make it smaller.

  As shown in FIGS. 22 and 23, the segment 1 to which the present invention is applied is provided with a predetermined reinforcing member 62 inside 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. The reinforcing member 62 is installed in the interior 6 a of the steel shell 6, so that the high strength of the filling concrete 60 and the reliable load transmission to the main girder plate 3 can be realized. It becomes possible to do.

  As shown in FIG. 22, the reinforcing member 62 is a steel plate or the like formed in a substantially flat plate shape, and as shown in FIG. 23, a reinforcing bar such as a deformed bar or a deformed bar is used. Are intermittently provided at about four locations in the circumferential direction Y. Further, the reinforcing member 62 is not limited to a steel plate and a reinforcing bar, and a section steel such as an H-section steel may be used.

  As shown in FIG. 24, when the steel plate formed in a substantially flat plate shape is used as the vertical rib 65, the reinforcing member 62 is centered with respect to both ends in the axial direction X, and the lower end of the vertical rib 65 is legal. A notch 62a arranged on the natural mountain side Z1 in the line direction Z may be formed. At this time, the longitudinal rib 65 is formed such that the notch 62a extends substantially linearly in the axial direction X on the center side in the axial direction X. Further, as shown in FIG. 24A, the vertical rib 65 is formed to be inclined in a substantially tapered shape from the notch 62a to both ends on both ends in the axial direction X, as shown in FIG. As described above, the both ends of the axial direction X are substantially linearly formed from the notch 62a to both ends.

  As shown in FIG. 25, when the longitudinal rib 65 formed in a substantially flat plate shape is used, the reinforcing member 62 is, for example, the natural ground side vertical rib 65a of the natural ground side Z1 in the normal direction Z and the normal direction Z The inner air side vertical rib 65b of the inner air side Z2 may be provided together. The vertical ribs 65 are arranged such that the natural mountain side vertical ribs 65a and the inner space side vertical ribs 65b are spaced apart from each other in the normal direction Z, and if necessary, the inner space side Z2 of the inner space side vertical ribs 65b. A notch 62a is formed at the lower end of the.

  As shown in FIG. 25 (a), the reinforcing member 62 is fixed to the side face of the main body 20 of each main beam plate 3 in the main beam plate 3 of the segmented steel 2 formed asymmetrically and is necessary. Accordingly, it is fixed to the skin plate 5. Further, as shown in FIG. 25 (b), the reinforcing member 62 is fixed to the web 26 of each main girder plate 3 in the main girder plate 3 of the segment shape steel 2 formed in line symmetry. And the reinforcement member 62 is fixed to the flange 25 of the natural mountain side Z1 or the inner space side Z2 of the skin plate 5 or each main girder plate 3 as required.

  As shown in FIG. 26A, the reinforcing member 62 may be formed with a predetermined gap G on the natural mountain side Z <b> 1 by notching a corner portion of the vertical rib 65. At this time, as shown in FIG. 26 (b), the reinforcing member 62 is fixed to the longitudinal rib 65 together with a part 61 a of the shift preventing member 61 such as an L-shaped gibber 81 as required. May be.

  As shown in FIG. 27, a plurality of reinforcing members 62 that are separated from each other in the circumferential direction Y by a predetermined separation distance d may be provided in the interior 6 a of the steel shell 6. The reinforcing member 62 is such that the separation distance d1 at the center side in the circumferential direction Y in the inside 6a of the steel shell 6 is smaller than the separation distances d2 and d3 at both ends in the circumferential direction Y in the inside 6a of the steel shell 6. It is desirable to become.

  As shown in FIGS. 28 and 29, the vertical ribs 65 are provided intermittently at about four locations in the circumferential direction Y, with steel plates formed in a substantially flat plate shape extending in the normal direction Z. Further, in the segment 1 to which the present invention is applied, as shown in FIGS. 30 to 32, the vertical rib 65 and the distribution bar 64 may be provided in the inner portion 6 a of the steel shell 6 as necessary. . At this time, as shown in FIG. 30, the distribution reinforcing bars 64 may be provided separately from the longitudinal ribs 65 in the circumferential direction Y, and as shown in FIGS. It may be provided in contact with the rib 65.

  In the interior 6a of the steel shell 6, as shown in FIG. 33 (a), the skin plate 5 provided on either one or both of the natural mountain side Z1 and the inner air side Z2 is substantially S inclined to the normal direction Z. An S-shaped gibber 84 bent in a letter shape may be fixed. At this time, as shown in FIG. 33 (b), the S-shaped gibber 84 is connected to the remaining portion 61 b extending in the axial direction X of the deformed U-shaped gibber 82, so 64 may be connected. At this time, since the segment 1 to which the present invention is applied is formed by dividing the S-shaped gibber 84 into parts, it is possible to improve the assemblability at the time of manufacturing the segment.

  As shown in FIGS. 20 and 33, the segment 1 to which the present invention is applied has an approximately S-shaped bent portion of the composite deformed gibber 83 or the S-shaped gibber 84 fixed to the skin plate 5, so that the external load In contrast, it is possible to increase the load resistance performance of the segment 1 by expanding the effective width that the skin plate 5 resists, and to effectively improve the shear reinforcement performance of the concrete against the external load. Further, in the out-of-plane deformation of the skin plate 5 due to the concrete pouring pressure during the manufacture of the segment, the skin plate 5 near the center in the axial direction X is most likely to bend, but the composite is bent into an oblique material such as a substantially S shape. By causing the deformation gibber 83 or the like to resist in the vicinity of the main girder plate 3, it is possible to effectively suppress the deformation of the skin plate 5.

  As shown in FIG. 30, the segment 1 to which the present invention is applied is provided with the force distribution bars 64 spaced apart 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. 31 and 32, the segment 1 to which the present invention is applied is provided with the reinforcing bars 64 in contact with the vertical ribs 65, so that the main steel material 63, the distributing bars 64, 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.

  When the distribution bars 64 are provided in contact with the longitudinal ribs 65 from both sides in the circumferential direction Y, as shown in FIG. 34 (a), the plurality of main steel members 63 on the natural mountain side Z1 and the inner air side Z2 are arranged. 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. 34 (b), 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. 29, the segment 1 to which the present invention is applied is provided such that the upper end portion of the ground rib side Z1 of the vertical rib 65 is separated from the skin plate 5 in the normal direction Z 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. Further, as shown in FIG. 25, the segment 1 to which the present invention is applied has the natural ground side vertical rib 65a and the inner space side while improving the rigidity of the skin plate 5 by fixing the natural ground side vertical rib 65a to the skin plate 5. The fresh concrete can pass through the gap G even when the predetermined gap G is formed by separating the vertical rib 65b. 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 FIGS. 14 and 15, a reinforcing material 66 such as a triangular rib, a square rib, or a trapezoidal rib that connects the two is appropriately disposed in the vicinity of the joint between the skin plate 5 and the main beam plate 3. Since the rigidity in the vicinity of the joint is increased, the effect of improving the performance of the segment 1 can be expected. Note that the reinforcing members 66 such as triangular ribs, square ribs, or trapezoidal ribs can be appropriately arranged regardless of the presence or absence of the vertical ribs 65, and the performance of the segment 1 can be improved.

  In addition, the segment 1 to which the present invention is applied is provided with an anti-slip member 61, a reinforcing member 62, a main steel material 63, a distribution bar 64, and a longitudinal bar in an inner portion 6a of the steel shell 6 shown in FIGS. In the state where the ribs 65 are appropriately combined, the filling concrete 60 is filled.

  As shown in FIG. 35, the segment 1 to which the present invention is applied has the other end side main girder plate of another segment 1 connected to the one end side main girder plate 31 of the predetermined segment 1 so as to be adjacent to each other in the axial direction X. A plurality of segments 1 are connected to each other by abutting 32.

  As shown in FIG. 35 (a), the segment 1 to which the present invention is applied has the segment 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, and as shown in FIG. 35 (b), 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. 35 (c), the segment 1 to which the present invention is applied includes a segment shape steel 2 formed asymmetrically as shown in FIG. 4 and a 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. 36, 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 3 in the segment 1 to which the present invention is applied, as shown in FIG. 36 (a), one end side main girder 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, the arrangement of the vertical ribs 65 and the like shown in FIGS. Thus, 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. 37, the main girder plates 3 are brought into contact with each other at both ends 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. 37, the segment 1 to which the present invention is applied is fitted to the filling concrete 60 as shown in FIG. 37 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. 38, 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. 38 (a), 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 narrowness 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. 38 (b), the water stop groove 23 is sealed with the water pressure of the ground water or the like so that the ground water pressure is applied from the natural mountain side Z1 and the ground water or the like tries to enter from the natural mountain side Z1 to the inner 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. 39, 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.

  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.

  As shown in FIGS. 18 to 34, the segment 1 to which the present invention is applied is provided with a reinforcing member 62 such as a longitudinal rib 65 in the inside 6 a of the steel shell 6. When both ends of the reinforcing member 62 in the axial direction X are fixed to the pair of main girders 3 by welding or the like, as shown in FIG. The side becomes large and easily bent.

  Furthermore, since the plurality of segments 1 are generally arranged in a staggered pattern, the position of the joint plate 4 of the other segment 1 adjacent in the axial direction X is determined as shown in FIG. It becomes substantially the center in the circumferential direction Y of the main girder 3 of one segment 1 adjacent to the direction X. At this time, since the approximate center in the circumferential direction Y of the main girder plate 3 of one segment 1 becomes the position of the joint plate 4 of the other segment 1 and becomes a structural weakness, It is necessary to reinforce the center side.

  Thus, although the center side in the circumferential direction Y of each main girder plate 3 is greatly deflected easily, the segment 1 to which the present invention is applied has a plurality of displacement preventing members 61 or reinforcements as shown in FIGS. The member 62 is provided, and the separation distance d1 on the central side in the circumferential direction Y is smaller than the separation distances d2 and d3 on both ends, so that the displacement preventing member is provided on the central side of the main girder 3 in the circumferential direction Y. 61 or the reinforcing member 62 is densely provided. At this time, in the segment 1 to which the present invention is applied, the displacement preventing member 61 or the reinforcing member 62 is densely provided on the center side in the circumferential direction Y of the main girder plate 3, so that the circumferential direction Y of each main girder plate 3. The central side of the tunnel is reinforced and the bending thereof is prevented, and the dimensional accuracy in the axial direction X of the segment 1 is improved, resulting in a high-quality segment 1, and the entire tunnel in which a plurality of segments 1 are arranged in a staggered manner It is possible to increase the strength.

  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. 41, the inventor of the present invention can secure 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 that the shift prevention rigidity in the normal direction Z is set to be relatively large, and an emphasis is placed on avoiding extreme risks such as tunnel collapse. It is intended to provide a tunnel segment structure that appropriately resists an external force acting on a tunnel by appropriately providing a tunnel tangential shift preventing member 61 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 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 61a: Part 61b: Remaining part 62: Reinforcement member 62a: Notch part 63: Main steel material 64: Power distribution bar 65: Vertical rib 65a : Natural mountain side vertical rib 65b: Inner air side vertical rib 66: Reinforcement material 7: Tunnel 70: Segment ring 81: L-shaped gibber 82: Deformed U-shaped gibber 83: Compound deformed gibber 84: S-shaped gibber A: Outside B Side X: axial Y: circumferentially Z: normal direction

Claims (14)

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 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,
A segment characterized in that a displacement preventing member fixed to one of the pair of main girder plates or a reinforcing member constructed on both of the pair of main girder plates is provided inside the steel shell. The slip prevention member is a reinforcing material fixed to the skin plate and the main girder plate provided on either or both of the natural mountain side and the inner sky side in the normal direction of the tunnel, or fixed to the skin plate. The segment according to claim 1, wherein a non-reinforced steel bar, steel plate, shaped steel, headed stud or U-shaped gibber is used. The shift preventing member uses an L-shaped bevel that is bent in a substantially L-shape, and one side that is a part of the L-shaped gibber is fixed to the main girder plate, and the remaining portion of the L-shaped dowel The segment according to claim 1, wherein a force distribution bar extending in the axial direction of the tunnel is connected to the other side. The shift preventing member is a deformed U-shaped bevel that is bent in a substantially U-shape, and a part of the deformed U-shaped gibber is either a natural mountain side or an inner sky side in the normal direction of the tunnel. 2. A force distribution bar which is fixed to the skin plate and the main girder plate provided on both sides and which extends in the axial direction of the tunnel is connected to the remaining portion of the deformed U-shaped gibber. Segments. The shift preventing member uses a composite deformation gibber in which a substantially U-shaped bent portion and a substantially S-shaped bent portion are formed, and a part of the composite deformed gibel is in the normal direction of the tunnel. At the same time, it is fixed to the main plate and the skin plate provided on either or both of the natural ground side and the inner sky side, and a distribution bar extending in the axial direction of the tunnel is connected to the remaining part of the composite deformation gibber. The segment according to claim 1, wherein: The shift preventing member is provided as a pair by being fixed to each of the one end side main girder plate and the other end side main girder plate, and a pair of both ends of the force distribution bars extending in the axial direction of the tunnel. The segment according to any one of claims 2 to 5, wherein the segment is connected to the slip prevention member. The detent member is provided in the steel shell with a plurality of detent members separated by a predetermined separation distance in the circumferential direction of the tunnel, and the separation distance on the center side in the circumferential direction of the tunnel is The segment according to any one of claims 2 to 6, wherein the segment is smaller than the separation distance at both ends in the circumferential direction of the tunnel. 2. The segment according to claim 1, wherein the reinforcing member is a reinforcing bar, a steel plate, or a shape steel in which both end portions in the axial direction of the tunnel are fixed to the pair of main girder plates. The reinforcing member is a substantially flat plate-shaped vertical rib in which both ends of the tunnel in the axial direction are fixed to the pair of main girder plates, and the vertical rib is located on the center side of both ends in the axial direction of the tunnel. The segment according to claim 1, wherein a notch portion is formed such that a lower end portion thereof is disposed on a natural ground side in a normal direction of the tunnel. The vertical rib is formed such that the notch portion extends substantially linearly in the axial direction of the tunnel and is inclined so as to be substantially tapered from the notch portion to both end portions. The stated segment. The vertical rib is provided with a natural ground side vertical rib on the natural ground side in the normal direction of the tunnel and an internal sky side vertical rib on the internal sky side in the normal direction of the tunnel, and the natural ground side vertical rib and the The segment according to claim 9 or 10, wherein the inner-side vertical ribs are spaced apart from each other in the normal direction of the tunnel. The segment according to any one of claims 9 to 11, wherein the vertical rib is cut out at a corner on the natural mountain side in a normal direction of the tunnel. The reinforcing member is provided with a plurality of reinforcing members separated by a predetermined separation distance in the circumferential direction of the tunnel inside the steel shell, and the separation distance at the center side in the circumferential direction of the tunnel The segment according to any one of claims 8 to 12, wherein the segment is smaller than the separation distance at both ends in the circumferential direction. Inside the steel shell, the skin plate provided on either one or both of the natural mountain side and the inner sky side in the normal direction of the tunnel was bent into a substantially S shape inclined in the normal direction of the tunnel. The segment according to any one of claims 1 to 13, wherein an S-shaped dowel is fixed.

Images