JP2017106305A - 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 A pair of joint plates disposed, and a steel shell filled with filling concrete is surrounded by the pair of main girder plates and the pair of joint plates, and the filling concrete is Refractory concrete mixed with synthetic fiber that melts or disappears by heat in the event of a fire is used, and the pair of main girder plates are one end side main girder that becomes the main girder plate arranged on one end side in the axial direction of the tunnel A main body extending in the normal direction of the tunnel is formed on the other end main girder plate, which is the main girder disposed on the other end side of the plate and the axial direction of the tunnel, Mating protrusion protruding in the axial direction A fitting receiving portion that is formed on the one end side main girder and is recessed from the main body portion in the axial direction of the tunnel is formed on the other end side main girder plate, and is formed on the one end side main girder plate. The fitting protrusion and the fitting receiving portion formed on the other end side main beam plate are continuously formed in the circumferential direction of the tunnel at substantially the same position in the normal direction of the tunnel. A fireproof coating material that is coated from the inner space side in the normal direction is provided.

  The segment according to a second aspect of the present invention is the segment according to the first aspect, wherein the fireproof coating material is an indeterminate shape material applied to the main girder plate or a fixed shape plate material affixed to the main girder plate. A boundary in the axial direction of the tunnel between the shaped material or the shaped plate material and the refractory concrete is formed on the inner side of the steel shell in the axial direction of the tunnel than the main girder plate.

  The segment according to a third aspect of the present invention is characterized in that, in the second aspect, the irregular shaped material or the shaped plate is formed with a coating thickness of 20 mm or more.

  The segment according to the fourth invention is the segment according to the second invention or the third invention, wherein the boundary in the axial direction of the tunnel between the irregular shaped material or the shaped plate material and the refractory concrete is separated from the main beam plate by 50 mm or more. The steel shell is formed on the inner side of the steel shell in the axial direction of the tunnel than the main beam plate.

  The segment according to a fifth aspect of the present invention is the segment according to any one of the second to fourth aspects of the present invention, wherein the indeterminate shape material or the shaped plate material is connected to one or both of the refractory concrete and the main girder via a wire mesh. It is fixed or fixed with an adhesive.

  The segment according to a sixth aspect of the present invention is the segment according to the first aspect, wherein the refractory covering material is a shaft of a tunnel from the inner side of the steel shell to the inner side of the main girder. By being provided continuously in the direction, the inner empty side of the main beam plate is covered.

  The segment according to a seventh aspect is characterized in that, in the sixth aspect, the refractory concrete covering the inner side of the main beam plate is formed with a covering thickness of 50 mm or more and 65 mm or less.

  The segment according to the eighth invention is the sixth invention or the seventh invention, wherein the refractory concrete covering the inner side of the main girder is fixed to the main girder via a gibber or a wire mesh, or It is fixed by an adhesive material.

  The segment according to the ninth invention is the segment according to any one of the sixth to eighth inventions, wherein a non-woven fabric is inserted between the refractory concrete covering the inner side of the main beam plate and the main beam plate. It is characterized by.

  The segment according to a tenth aspect of the invention is any one of the first to ninth aspects of the invention, wherein the fireproof coating material is in the fireproof coating material and the other segment in one segment adjacent to each other in the axial direction or circumferential direction of the tunnel. A gap of 5 mm or more and 13 mm or less is formed by separating the fireproof covering material.

  A segment according to an eleventh aspect is characterized in that, in the tenth aspect, the gap is filled with a refractory coking material.

  The segment according to a twelfth aspect of the present invention is the segment according to the eleventh aspect, wherein the gap is filled with a backup material in a deep part on the ground mountain side in the normal direction of the tunnel and is shallow on the inner sky side in the normal direction of the tunnel. The refractory caulking material is filled so as to cover the back-up material.

  The segment according to a thirteenth aspect of the present invention is the segment according to any one of the first to twelfth aspects of the present invention, wherein the main girder plate or the joint plate is the main girder plate or one of the segments adjacent to each other in the axial direction or circumferential direction of the tunnel. The joint plate and the main girder plate or the joint plate in the other segment are arranged at a distance of 1 mm or more.

  According to the first to thirteenth inventions, the fitting convex portions and the fitting receiving portions of the pair of main girder plates are formed in shapes corresponding to each other at substantially the same position in the normal direction. It becomes possible to improve the integrity of a plurality of segments connected in the axial direction. Moreover, according to 1st invention-13th 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 third and fourth inventions, the distance between the fireproof coatings in the axial direction is 50 mm or more, the fireproof coating is formed with a coating thickness of 20 mm or more, and the exposed concrete surface is exposed. By ensuring a heat transfer distance of at least 70 mm to the lower end of the main girder, it is possible to suppress temperature rise of the filling concrete and the main girder. In addition, by ensuring a heat transfer distance of at least 70 mm, it is possible to prevent rusting of the main girder plate and to prevent pumice from filling concrete.

  Particularly, according to the fifth and eighth inventions, the fireproof covering material is fixed to the refractory concrete or main girder plate as the filling concrete with a gibber or a wire mesh, or the fireproof covering material is fixed with an adhesive. Therefore, it is possible to prevent the fireproof coating material from falling from the main beam plate to the inner space side.

  In particular, according to the ninth invention, the nonwoven fabric is inserted between the refractory concrete and the main girder covering the inner side of the main girder, and the refractory concrete and the main girder are not fixed to each other. It is possible to prevent cracking due to the refractory concrete being fixed to the main girder.

  In particular, according to the tenth to thirteenth inventions, with a simple configuration that only forms a gap of 5 mm or more and 13 mm or less between the fireproof coating material in one segment and the fireproof coating material in the other segment, While securing sufficient fire resistance of the plurality of segments connected in the axial direction and the circumferential direction, it is possible to prevent damage due to contact between the fireproof coating materials.

  In particular, according to the tenth invention, the refractory caulking material and the backup material do not have to be filled in the gap, and if necessary, only the refractory caulking material or the backup material is filled in the small gap, By suppressing the usage of the fireproof caulking material and the backup material as much as possible, it is possible to shorten the construction period of fireproofing measures and provide a fireproof structure at low cost.

  In particular, according to the eleventh and twelfth inventions, it is possible to improve the fire resistance of a plurality of segments by filling the gap with the fireproof caulking material or backup material, and the fireproof caulking material or backup material. As described above, by selectively using an expensive material and an inexpensive material, an economical fireproof structure can be obtained.

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. 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. It is a graph which shows the relationship between deviation | shift amount and manufacture difficulty in the segment to which this invention is applied. (A) is the front view of the circumferential direction which shows the fireproof coating material of the main beam board of the segment shape steel formed asymmetrically in the segment to which this invention is applied, (b) is the segment formed in line symmetry It is a front view of the circumferential direction which shows the fireproof coating | covering material of the main girder of a shape steel. (A) is a front view which shows the fireproof coating material of the irregular shape material in 1st Embodiment of the segment to which this invention is applied, (b) is a front view which shows the fireproof coating material of a fixed-shaped board | plate material. (A) is a front view which shows the fireproof coating material fixed through the wire mesh in 1st Embodiment of the segment to which this invention is applied, (b) shows the fireproof coating material fixed with the adhesive material. It is a front view. (A) is a front view which shows the fireproof covering material of the main beam board of the segment shape steel formed asymmetrically in 2nd Embodiment of the segment to which this invention is applied, (b) is formed axisymmetrically. It is a front view which shows the fireproof coating | covering material of the main girder of segmented steel. (A) is a front view which shows the fireproof coating material fixed through the diver in 2nd Embodiment of the segment to which this invention is applied, (b) is a nonwoven fabric inserted between main girder plates. It is a front view which shows the fireproof coating material. It is a front view which shows the clearance gap formed when the main beam board and fireproof coating | covering material of the several segment were spaced apart in the axial direction by the segment to which this invention is applied. It is a front view which shows the clearance gap formed when the joint board and fireproof coating | covering material of several segments were spaced apart in the circumferential direction by the segment to which this invention is applied. (A) is a front view which shows the clearance gap of the fireproof coating material by which only the fireproof caulking material was filled with the segment which applied this invention, (b) is filled with the backup material in addition to the fireproof caulking material It is a front view which shows the clearance gap between the made fireproof coating materials.

  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.

  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.

  The segment 1 to which the present invention is applied is, as shown in FIG. 21, 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. 21A, 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, and as shown in FIG. 21 (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.

  Furthermore, 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 axisymmetrically as shown in FIG. 5 as shown in FIG. And a plurality of segments 1 may be connected to each other.

  As shown in FIG. 22, 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 adjacent to each other 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. 7B is adopted as the main girder plate 3 in the segment 1 to which the present invention is applied, as shown in FIG. 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 arranged 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. 23, 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. 23, the segment 1 to which the present invention is applied is fitted to the filling concrete 60 as shown in FIG. 23 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. 24, the segment 1 to which the present invention is applied particularly has the other end-side main girder plate 32 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. 24A, 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. 24 (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, as shown in FIG. 25, the segment 1 to which the present invention is applied has a water stop groove 23 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.

  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. 26, 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.

  Here, as shown in FIG. 27, the segment 1 to which the present invention is applied is filled with heat in the case of a fire such as polypropylene fiber or vinylon fiber in the inside-filled concrete 60 filled in the inside 6a of the steel shell 6. Refractory concrete mixed with molten or disappearing synthetic fiber is used. At this time, the segment 1 to which the present invention is applied is provided with a fireproof covering material 8 covered from the inner space side Z2 in the normal direction Z on either or both of the pair of main girders 3.

  The refractory concrete used as the filling concrete 60 is a concrete in which a synthetic fiber that melts or disappears by heat in a fire is mixed by mixing a heat-meltable synthetic resin fiber such as polypropylene fiber or vinylon fiber. Become. The concrete composition and production method are described in, for example, “Tunnel Management Guidelines (Fiber Reinforced Concrete), September 2003, Japan Highway Public Corporation”, or “Report on the Fireproof Technology Research Subcommittee on Concrete Structures” It may be based on the description of “Symposium Proceedings P72 to P75”.

  The refractory concrete used as the filling concrete 60 is, for example, exposed from the inside 6a of the steel shell 6 to the inner air side Z2. At this time, as shown in FIG. 27 (a), the fireproof covering material 8 is provided on the inner side Z2 of the main girder plate 3 in which the segmented steel 2 formed asymmetrically is used. ), The segment shape steel 2 formed in line symmetry may be provided on the inner space side Z2 of the main beam plate 3 in which the segment shape steel 2 is used.

  In the first embodiment, the segment 1 to which the present invention is applied is applied to the main girder plate 3 as shown in FIG. 28A as the fireproof covering material 8 that is coated from the inner space side Z2 of the main girder plate 3. An indefinite shape material 81 is used. Further, the segment 1 to which the present invention is applied is formed on the main beam plate 3 as shown in FIG. 28 (b) as a fireproof covering material 8 covered from the inner space side Z2 of the main beam plate 3 as required. A fixed plate member 82 to be attached may be used.

  The fireproof covering material 8 in which the indeterminate shaped material 81 or the shaped plate material 82 is used contains, for example, a nonflammable material such as cement, ceramic, vermiculite or gypsum, and if necessary, rock wool, glass wool, polypropylene fiber. And one or more of water. The fireproof covering material 8 using the irregular shaped material 81 or the shaped plate material 82 is formed from the lower end portion 3a such as the lower surface of the flange 25 of the main girder plate 3 to the inner space side Z2 with a coating thickness t of, for example, 20 mm or more. The

  The irregular shaped material 81 is applied to the main girder plate 3 from the inner air side Z2 by coating, spraying, or winding rock wool or the like on the lower end 3a such as the lower surface of the flange 25 of the main girder plate 3. Is done. The fixed plate 82 is attached to the main girder plate 3 from the inner space side Z2 by attaching a substantially flat plate material such as cement board to the lower end 3a such as the lower surface of the flange 25 of the main girder plate 3. The

  The irregular shaped material 81 or the shaped plate material 82 is made of refractory concrete that becomes an inside-filled concrete 60 by projecting from the lower end 3a such as the lower surface of the flange 25 of the main girder plate 3 toward the inside 6a of the steel shell 6 in the axial direction X. A boundary 8a in the axial direction X is formed between the two. Then, the indeterminate shaped material 81 or the shaped plate material 82 is, for example, set in the axial direction X with the refractory concrete to be the filled concrete 60 with a distance d separated in the axial direction X from the main girder plate 3 to the boundary 8a being 50 mm or more. The boundary 8a is formed on the inner 6a side of the steel shell 6 in the axial direction X with respect to the main beam plate 3.

  The irregular shaped material 81 or the shaped plate material 82 is formed with a coating thickness t of 20 mm or more with a separation distance d from the main girder plate 3 to the boundary 8a being 50 mm or more. The heat transfer distance is at least 70 mm (= 50 mm + 20 mm) to the lower end portion 3 a of the main beam plate 3. Here, in the event of a fire, it is generally required to suppress the surface temperature of the flange 25 of the main girder plate 3 to 300 ° C. or lower, and to suppress the surface temperature of the filling concrete 60 to 350 ° C. or lower. However, by ensuring a heat transfer distance of 70 mm or more, it is possible to suppress a temperature rise so as to satisfy these required levels.

In general, when CO ₂ gas from a fire comes into contact with concrete, the alkaline concrete becomes neutral, the strength is lowered, and the steel material inside may be rusted by contact with water and oxygen. However, in a tunnel fire in which the maximum temperature of 1200 ° C continues for about 60 minutes, the neutralization of concrete proceeds only about 50 mm from the surface, so by securing a heat transfer distance of at least 70 mm, the neutralization of the concrete is 50 mm from the surface. However, it is possible to prevent neutralization in the remaining 20 mm thick portion, and thus to prevent rusting of the flange 25 of the main girder plate 3. Furthermore, in the refractory concrete, the mixed synthetic fibers are melted by heat and become pumice, but the synthetic fibers are melted in a tunnel fire with a maximum temperature of 1200 ° C. and a duration of about 60 minutes. It is about 50 mm from the concrete surface. For this reason, by securing a heat transfer distance of 70 mm or more until reaching the flange 25 of the main girder plate 3, even if 50 mm fiber is melted from the surface, the remaining 20 mm thick portion prevents pumice formation. It becomes possible.

  As shown in FIG. 29 (a), the irregular shaped material 81 or the shaped plate member 82 is provided with a wire mesh 83 on one or both of the refractory concrete and the main girder plate 3 as the filling concrete 60 as necessary. Fixed. The metal mesh 83 is used by arranging reinforcing bars or steel bars or the like as vertical and horizontal bars in a substantially lattice shape, or by using an expanded metal or a lath having a plurality of meshes formed in a substantially lattice shape. The vertical and horizontal bars are fixed to each other by welding or the like.

  When the metal mesh 83 is attached to the refractory concrete that is the filling concrete 60, for example, the anchor member 83a is inserted into a drill hole drilled in the surface of the filling concrete 60 and attached to the anchor member 83a. Further, when the wire mesh 83 is attached to the main beam plate 3, for example, the anchor member 83a is fixed to the flange 25 of the main beam plate 3 by welding or the like, and is attached to the anchor member 83a. As the anchor member 83a, for example, a headed screw is used, and a steel wire bent in a substantially L shape is used.

  As shown in FIG. 29 (b), the irregular shaped material 81 or the shaped plate member 82 is a refractory adhesive material to one or both of the refractory concrete and the main girder plate 3 as the filling concrete 60, as shown in FIG. It may be fixed at 85. At this time, as shown in FIG. 29, the indeterminate shaped material 81 or the shaped plate material 82 is fixed to the refractory concrete or the main girder plate 3 as the filling concrete 60 through the wire mesh 83, or with the adhesive 85. By being fixed, it becomes possible to prevent the fireproof coating material 8 from falling from the main beam plate 3 to the inner space side Z2.

  Further, in the second embodiment, in the segment 1 to which the present invention is applied, as shown in FIG. 30, the refractory concrete that becomes the filling concrete 60 is from the inside 6 a side of the steel shell 6 to the inner side of the main girder plate 3. By being provided continuously in the axial direction X up to Z2, the fireproof covering material 8 that covers the inner space side Z2 of the main beam plate 3 is formed. At this time, the refractory concrete covering the inner space side Z2 of the main girder plate 3 has a coating thickness of, for example, 50 mm or more and 65 mm or less from the lower end portion 3a such as the lower surface of the flange 25 of the main beam plate 3 to the inner space side Z2. formed by t.

  The refractory concrete covering the inner side Z2 of the main girder plate 3 is fixed to the main girder plate 3 via a gibber 84 such as a stud gibber or a helical gibber, as shown in FIG. The The gibber 84 is fixed to the flange 25 of the main beam plate 3 by welding or the like, for example. The refractory concrete covering the inner side Z2 of the main girder 3 may be fixed via a wire mesh 83 shown in FIG. 29 (a), if necessary, with an adhesive 85 shown in FIG. 29 (b). It may be fixed.

  As shown in FIG. 31 (b), the refractory concrete covering the inner space side Z2 of the main girder 3 has a nonwoven fabric 86 inserted between the lower end 3a of the main girder 3, The refractory concrete and the main girder 3 do not stick to each other. At this time, in the segment 1 to which the present invention is applied, the refractory concrete to be the refractory coating material 8 and the main girder plate 3 are not fixed to each other, so that cracking due to the refractory concrete being fixed to the main girder plate 3 is prevented. Is possible.

  In any of the first and second embodiments, the segment 1 to which the present invention is applied has a plurality of segments 1 connected in the axial direction X and the circumferential direction Y as shown in FIGS. One segment 1 and the other segment 1 are adjacent to each other in the axial direction X or the circumferential direction Y. And the segment 1 to which the present invention is applied is 5 mm or more by separating the fireproof covering material 8 in one segment 1 and the fireproof covering material 8 in the other segment 1 in the axial direction X or the circumferential direction Y, A gap G1 of 13 mm or less is formed.

  At this time, the segment 1 to which the present invention is applied is the main girder 3 in one segment 1 and the main girder in the other segment 1 as shown in FIG. 32 in both the first and second embodiments. The girders 3 may be arranged so as to be separated from each other in the axial direction X, and a gap G2 of 1 mm or more may be formed. In addition, as shown in FIG. 33, the segment 1 to which the present invention is applied is arranged such that the joint plate 4 in one segment 1 and the joint plate 4 in the other segment 1 are spaced apart from each other in the circumferential direction Y. A gap G2 of 1 mm or more may be formed.

At this time, the gap G1 is filled with a refractory coking material 87 as shown in FIG. For the fireproof caulking material 87, a fireproof or nonflammable filler is used, for example, “Sealant 40KKS fireproof made by Shin-Etsu Chemical Co., Ltd.” is used. The properties of the sealant 40KKS fireproof before hardening are paste appearance, specific gravity (20 ° C) 1.58, tack-free 20 minutes, extrudability (5 ° C) 8 seconds, slump 0mm, after hardening The characteristics of the heat loss (%) are 6.7, the 50% tensile stress N / mm ² is 0.57, the maximum tensile stress N / mm ² is 1.01, the elongation% is 120, and the agglomeration is 120%. It is a durable material with a destruction rate (%) of 100, no contamination, and no ozone crack as ozone resistance.

  As shown in FIG. 34 (a), the gap G1 is filled only with the refractory caulking material 87, and as shown in FIG. 34 (b), it is filled with the backup material 88 together with the refractory caulking material 87. May be. At this time, the gap G1 is filled with the back-up material 88 in the deep portion Ga which becomes the natural mountain side Z1 in the normal direction Z, and is covered with the back-up material 88 in the shallow portion Gb which becomes the inner space side Z2 in the normal direction Z. As shown, the fireproof caulking material 87 is filled.

  The backup material 88 is a fireproof or nonflammable inexpensive material such as a fiber such as ceramic fiber, a blanket such as rock wool, or a fireproof board or nonflammable board, and has high workability and deformation followability. Is preferably used. The backup material 88 is mainly made of a refractory material. For example, when the refractory coking material 87 covering the backup material 88 is 1500 ° C., a non-refractory material may be used. And the backup material 88 is filled with 2 or more types of refractory materials etc. over two or more steps as needed. When a fire-resistant material is used for the backup material 88, a non-fire-resistant caulking material may be used as the fire-resistant coking material 87.

  In the segment 1 to which the present invention is applied, the refractory caulking material 87 and the backup material 88 may not be filled in the gap G1, and the refractory coking material 87 or the backup material 88 is filled in the small gap G1 as necessary. Therefore, the fireproof caulking material 87 and the backup material 88 have a thickness of about 5 mm, and the use amount thereof is suppressed as much as possible, thereby shortening the construction period of fireproofing measures and providing a fireproof structure at low cost. It becomes possible.

  The segment 1 to which the present invention is applied has a simple configuration in which a gap G1 of 5 mm or more and 13 mm or less is formed between the fireproof coating material 8 in one segment 1 and the fireproof coating material 8 in the other segment 1. Thus, it is possible to prevent breakage due to contact between the fireproof covering materials 8 while ensuring sufficient fire resistance of the plurality of segments 1 connected in the axial direction X and the circumferential direction Y. The segment 1 to which the present invention is applied can improve the fire resistance of the plurality of segments 1 by filling the gap G1 with the fire-resistant coking material 87 or the backup material 88, and the fire-resistant coking material 87. Alternatively, an economical fireproof structure can be obtained by selectively using an expensive material and an inexpensive material as the backup material 88.

  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 7: Tunnel 70: Segment ring 8 : Fireproof covering material 8a: Boundary 81: Indeterminate shaped material 82: Shaped plate material 83: Wire mesh 83a: Anchor member 84: Giber 85: Adhesive material 86: Nonwoven fabric 87: Fireproof caulking material 88: Backup A: outer B: inner X: axial Y: circumferentially Z: normal direction

Claims (13)

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 filling concrete is refractory concrete mixed with synthetic fiber that melts or disappears by heat in the event of a fire,
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 and covered from the inner side in the normal direction of the tunnel. A segment characterized by having a fireproof covering material. The fireproof covering material is an indeterminate shaped material applied to the main girder plate or a shaped plate material affixed to the main girder plate, and a tunnel between the indeterminate shaped material or the shaped plate material and the refractory concrete. 2. The segment according to claim 1, wherein the boundary in the axial direction is formed on the inner side of the steel shell in the axial direction of the tunnel than the main girder plate. The segment according to claim 2, wherein the irregular shaped material or the shaped plate material is formed with a coating thickness of 20 mm or more. The boundary in the axial direction of the tunnel between the irregular shaped material or the shaped plate material and the refractory concrete is separated from the main girder by 50 mm or more, and the inside of the steel shell in the axial direction of the tunnel than the main girder. The segment according to claim 2 or 3, wherein the segment is formed on a side. The said non-standard-shaped material or the said fixed-shaped board | plate material is fixed to either one or both of the said refractory concrete and the said main girder via a wire mesh, or is fixed with an adhesive material. The segment of any one of -4. The refractory covering material is the refractory concrete that becomes the filling concrete, and is continuously provided in the axial direction of the tunnel from the inner side of the steel shell to the inner air side of the main girder plate. The segment according to claim 1, which covers the inner air side of the plate. The segment according to claim 6, wherein the refractory concrete covering the inner side of the main girder is formed with a coating thickness of 50 mm or more and 65 mm or less. 8. The refractory concrete covering the inner side of the main girder is fixed to the main girder via a gibber or a wire mesh, or fixed with an adhesive. Segment. The segment according to any one of claims 6 to 8, wherein a non-woven fabric is inserted between the refractory concrete covering the inner side of the main girder and the main girder. The fireproof coating material forms a gap of 5 mm or more and 13 mm or less by separating the fireproof coating material in one segment adjacent to each other in the axial direction or circumferential direction of the tunnel and the fireproof coating material in the other segment. The segment according to any one of claims 1 to 9, wherein: The segment according to claim 10, wherein the gap is filled with a refractory coking material. The gap is filled with a backup material in a deep part on the ground side in the normal direction of the tunnel, and the fire resistance so as to cover the shallow part on the inner sky side in the normal direction of the tunnel. The segment according to claim 11, wherein the segment is filled with a caulking material. The main girder plate or the joint plate is 1 mm in which the main girder plate or the joint plate in one segment adjacent to each other in the axial direction or circumferential direction of the tunnel and the main girder plate or the joint plate in the other segment are 1 mm. The segment according to any one of claims 1 to 12, wherein the segments are arranged apart from each other.

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