Tunnel lining structure and tunnel lining construction method

Abstract

To prevent a segment from coming out with a simple structure.SOLUTION: In a tunnel lining structure (lining body 9) formed by arranging and connecting a plurality of segments S in the tunnel circumferential and axial directions, adjacent segments S in the tunnel axial direction are connected and fixed by one-pass joints 10, and adjacent segments S in the tunnel circumferential direction are connected and fixed by bolt joints 40. The one-pass joints 10 include a male joint 20 provided on one of the adjacent segments S in the tunnel axial direction, and a female joint 30 provided on the other of the adjacent segments S in the tunnel axial direction, into which the male joint 20 is inserted.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a lining structure of a tunnel formed by arranging a plurality of segments in the circumferential direction and the axial direction of the tunnel and connecting them to each other, and a method for constructing a lining body of a tunnel by arranging a plurality of segments in the circumferential direction and the axial direction of the tunnel and connecting them to each other.

Background Art

[0002] A shield tunnel used as a pipeline such as a water supply and sewerage system, a utility tunnel, a road, or a railway is constructed by the shield method. In the shield method, a shield tunneling machine is used. The shield tunneling machine includes, for example, a cylindrical skin plate, a cutter head provided at the front end (face side end) of the skin plate for excavating the ground, and a propulsion jack provided inside the skin plate.

[0003] In the shield method, for example, a launch shaft and a reception shaft are constructed in the ground, and while excavating the ground with a shield tunneling machine from the launch shaft toward the reception shaft, segments for tunnel lining are successively connected in the circumferential direction of the tunnel at the rear part inside the skin plate to construct a segment ring, and adjacent segment rings are connected in the axial direction of the tunnel to construct a cylindrical lining body. In other words, the lining body is constructed by arranging a plurality of segments in the circumferential direction and the axial direction of the tunnel and connecting them to each other. In the shield method, the shield tunneling machine presses the existing segments behind it backward with the propulsion jack, and advances while excavating the ground by the thrust generated as the reaction force.

[0004] By the way, for example, when constructing a segment ring or when the shield tunneling machine reaches the reception shaft, if the propulsion jack is released from the existing segments behind it, there is a possibility that the existing segments at the released location may protrude forward (face side) from the segment ring behind it. An example of this countermeasure is disclosed in Patent Document 1. Patent Document 1 aims to prevent the extraction (opening) of the K segment, which is finally connected by the axial insertion and closing method among the segments assembled in the circumferential direction of the tunnel in the shield method, and discloses connecting the K segment and the existing segment located on the rear side (shaft side) thereof with a PC steel bar.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The extraction of the segment can occur significantly in the K segment that is finally connected, but it can also occur in the A segment and B segment other than the K segment. In this regard, in the technology disclosed in Patent Document 1, it is necessary to prepare various PC steel bars for the countermeasure of preventing the extraction of the segment, and the installation work and removal work of the PC steel bar occur, which is time-consuming and may reduce the construction efficiency of the tunnel. In view of such a situation, an object of the present invention is to provide a tunnel lining structure suitable for the countermeasure of preventing the extraction of the segment with a simple structure, and a method for constructing a tunnel lining body.

Means for Solving the Problems

[0007] Therefore, the lining structure of the tunnel according to the present invention is formed by arranging a plurality of segments in the circumferential direction and the axial direction of the tunnel and connecting them to each other. In the lining structure of the tunnel according to the present invention, adjacent segments in the axial direction of the tunnel are connected and fixed by a one-pass joint, and adjacent segments in the circumferential direction of the tunnel are connected and fixed by a bolt joint. The one-pass joint includes a male joint provided on one of the adjacent segments in the axial direction of the tunnel and a female joint provided on the other of the adjacent segments in the axial direction of the tunnel into which the male joint is inserted.

[0008] The construction method of the lining body of the tunnel according to the present invention is a method of constructing the lining body of the tunnel by arranging a plurality of segments in the circumferential direction and the axial direction of the tunnel and connecting them to each other. The construction method of the lining body of the tunnel according to the present invention includes the step of connecting and fixing adjacent segments in the axial direction of the tunnel by a one-pass joint, and the step of connecting and fixing the segment connected and fixed by the one-pass joint and the segment adjacent to the segment in the circumferential direction of the tunnel by a bolt joint. The one-pass joint includes a male joint provided on one of the adjacent segments in the axial direction of the tunnel and a female joint provided on the other of the adjacent segments in the axial direction of the tunnel into which the male joint is inserted.

Effect of the Invention

[0009] According to the present invention, with a simple configuration, it is possible to take measures to prevent the extraction of segments.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0012] FIG. 1 shows the schematic configuration of a shield tunneling machine in an embodiment of the present invention. In this embodiment, for the sake of convenience, the tunnel excavation direction is defined as the forward direction, and the front and rear are specified. In this embodiment, the configuration of the shield tunneling machine will be described by taking a so-called earth pressure type shield tunneling machine as an example. However, the type of the shield tunneling machine is not limited to this. For example, a slurry type shield tunneling machine may also be used.

[0013] The shield tunneling machine 1 used for constructing a tunnel (shield tunnel) includes a cylindrical (for example, circular cylindrical) skin plate 2 that forms its main body. The shield tunneling machine 1 excavates the ground with a cutter head (not shown) provided on the front surface of the skin plate 2, takes in earth and sand, and discharges it rearward to advance.

[0014] Inside the skin plate 2 of the shield tunneling machine 1, multiple propulsion jacks 3 are arranged at intervals from one another in the circumferential direction along the inner surface of the skin plate 2. The propulsion jacks are hydraulic jacks consisting of a cylinder 4 and a rod 5. One end of the cylinder 4 is fixed to the skin plate 2, and the rod 5 can be advanced and retracted at the other end. The shield tunneling machine 1 can obtain a propulsive force by extending the propulsion jack 3 with the tip of the rod 5 of the propulsion jack 3 abutting against an existing segment (segment piece) S. In this way, the propulsion jack 3 receives a reaction force from the existing segment S to propel the shield tunneling machine 1.

[0015] The shield machine 1 is equipped with an erector device 6 inside the rear (tail portion) of the skin plate 2. The erector device 6 is used to construct the segment ring SR, and includes a gripping unit 7. The erector device 6 can grip a segment S having an arc-shaped cross section (e.g., a circular cross section) with the gripping unit 7, and can move the segment S appropriately in the tunnel circumferential direction, the tunnel inner / outer direction (e.g., the tunnel radial direction), and the tunnel axial direction.

[0016] Here, a method for constructing the segment ring SR will be described with reference to Fig. 2. Fig. 2 is an exploded view of the segment ring SR, and a segment allocation diagram. Fig. 2 shows an exploded view of a state in which a segment ring SR1 of a set A and a segment ring SR2 of a set B, which are adjacent to each other in the tunnel axial direction, are connected. Fig. 2 is also a view seen from the inside of the tunnel, and the tops TP of the segment rings SR1 and SR2 are shown by dashed lines. In Fig. 2, for the sake of simplicity, the female joint 30 of the one-pass joint 10, which will be described later, is omitted from the illustration.

[0017] The segment rings SR (each of the first-group segment ring SR1 and the second-group segment ring SR2) are each composed of, for example, two pieces of A segments A1S and A2S, two pieces of B segments B1S and B2S, and one piece of K segment (key segment) KS. Note that the number of pieces of segments constituting the segment ring SR is not limited to this.

[0018] The A segments A1S and A2S are each formed in a rectangular shape in plan view, with the side along the tunnel axis direction being the short side and the side along the direction perpendicular to the tunnel axis direction being the long side.

[0019] The B segment B1S is formed in a right trapezoidal shape in plan view, with the face side as the upper base of the short side and the shaft mouth side as the lower base of the long side. Also, two vertices forming a right angle in the B segment B1S in plan view are respectively opposed to two vertices of the adjacent A segment A2S.

[0020] The B segment B2S is formed in a right trapezoidal shape in plan view, with the face side as the upper base of the short side and the shaft mouth side as the lower base of the long side. Also, two vertices forming a right angle in the B segment B2S in plan view are respectively opposed to two vertices of the adjacent A segment A1S.

[0021] The K segment KS is formed in an isosceles trapezoidal shape in plan view, with the shaft mouth side as the upper base of the short side and the face side as the lower base of the long side. In other words, the K segment KS is formed in a tapered shape that tapers from the face side toward the shaft mouth side in plan view.

[0022] In this embodiment, the segment ring SR is constructed by assembling the A segments A1S and A2S, the B segments B1S and B2S, and the K segment KS in the following procedure, for example.

[0023] First, using the erector device 6, the A segment A1S is moved in the tunnel axis direction from the face side toward the shaft mouth side and connected and fixed to the lower part of the face side end surface of the existing segment ring SR via the one-pass joint 10.

[0024] Next, using the erector device 6, while adjoining the A segment A2S to one side of the A segment A1S, move it in the tunnel axis direction from the face side toward the shaft mouth side, and connect and fix it to the face side end face of the existing segment ring SR via the one-pass joint 10. After that, while gripping the A segment A2S with the gripping part 7 of the erector device 6, connect and fix the A segment A2S to the adjacent A segment A1S via the bolt joint 40.

[0025] Next, using the erector device 6, while adjoining the B segment B2S to the other side of the A segment A1S, move it in the tunnel axis direction from the face side toward the shaft mouth side, and connect and fix it to the face side end face of the existing segment ring SR via the one-pass joint 10. After that, while gripping the B segment B2S with the gripping part 7 of the erector device 6, connect and fix the B segment B2S to the adjacent A segment A1S via the bolt joint 40.

[0026] Next, using the erector device 6, while adjoining the B segment B1S to the side opposite to the A segment A1S of the A segment A2S, move it in the tunnel axis direction from the face side toward the shaft mouth side, and connect and fix it to the face side end face of the existing segment ring SR via the one-pass joint 10. After that, while gripping the B segment B1S with the gripping part 7 of the erector device 6, connect and fix the B segment B1S to the adjacent A segment A2S via the bolt joint 40.

[0027] Finally, using the erector device 6, move the K segment KS in the tunnel axis direction from the face side toward the shaft mouth side so as to insert it in a wedge shape into the gap between the B segments B1S and B2S, and connect and fix it to the upper part of the face side end face of the existing segment ring SR via the one-pass joint 10. After that, while gripping the K segment KS with the gripping part 7 of the erector device 6, connect and fix the K segment KS to the adjacent B segments B1S and B2S via the bolt joint 40.

[0028] In this way, a segment ring SR with a K segment KS positioned at the upper part is constructed.

[0029] By sequentially constructing this segment ring SR in the tunnel axis direction (in other words, by sequentially constructing the segment rings SR1 of the first group and the segment rings SR2 of the second group so that they are alternately arranged in the tunnel axis direction), as shown in FIG. 1, a cylindrical (for example, circular cylindrical) lining body 9 is constructed.

[0030] In addition, for the segment rings SR1 of the first group and the segment rings SR2 of the second group that are adjacent to each other in the tunnel axis direction, each segment ring SR1, SR2 is constructed so that the K segments KS of each other are staggeredly arranged in a plan view so as not to contact each other.

[0031] In this embodiment, a one-pass joint 10 is used as a joint (so-called "inter-ring joint") for connecting and fixing segment rings SR adjacent to each other in the tunnel axis direction. The one-pass joint 10 is composed of a male joint 20 and a female joint 30 that can be fitted while sliding the segment S gripped by the gripping portion 7 of the erector device 6 in the tunnel axis direction by the erector device 6 and abutting it against the end face on the face side of the existing segment ring SR. An example of this one-pass joint 10 will be described later with reference to FIGS. 5 to 7.

[0032] In this embodiment, a bolt joint 40 is used as a joint (so-called "inter-segment joint") for connecting and fixing segments S adjacent to each other in the tunnel circumferential direction. The bolt joint 40 connects and fixes segments S adjacent to each other in the tunnel circumferential direction by bolt fastening. In this embodiment, it includes a bolt 45 (see FIG. 10 described later), a steel plate type joint 50, and an insert type joint 60. An example of this bolt joint 40 will be described later with reference to FIGS. 8 to 10.

[0033] Figs. 3 and 4 show the schematic configuration of the segment S that constitutes the lining member 9. Specifically, Fig. 3(A) shows the schematic configuration of the A segments A1S and A2S, Fig. 3(B) shows the schematic configuration of the B segment B1S, Fig. 4(C) shows the schematic configuration of the B segment B2S, and Fig. 4(D) shows the schematic configuration of the K segment KS.

[0034] In this embodiment, the segments S (A segments A1S and A2S, B segments B1S and B2S, and K segment KS) are made of concrete, specifically, RC segments (reinforced concrete segments).

[0035] As shown in Fig. 3(A), a plurality of male joints 20 arranged at intervals in the tunnel circumferential direction are disposed at the shaft side ends of the A segments A1S and A2S. The male joints 20 (specifically, male pin bolts 22 described later) project from the shaft side end faces of the A segments A1S and A2S toward the shaft side. A plurality of female joints 30 arranged at intervals in the tunnel circumferential direction are disposed at the face side ends of the A segments A1S and A2S. A plurality of steel plate joints 50 arranged at intervals in the tunnel axial direction are disposed at one end of the A segments A1S and A2S in the tunnel circumferential direction. A plurality of insert type joints 60 arranged at intervals in the tunnel axial direction are disposed at the other end of the A segments A1S and A2S in the tunnel circumferential direction.

[0036] As shown in Fig. 3(B), a plurality of male joints 20 arranged at intervals in the tunnel circumferential direction are disposed at the shaft side end of the B segment B1S. The male joints 20 (specifically, male pin bolts 22 described later) project from the shaft side end face of the B segment B1S toward the shaft side. A plurality of female joints 30 arranged at intervals in the tunnel circumferential direction are disposed at the face side end of the B segment B1S. A plurality of steel plate joints 50 arranged at intervals in the tunnel axial direction are disposed at one end of the B segment B1S in the tunnel circumferential direction. A plurality of insert type joints 60 arranged at intervals in the tunnel axial direction are disposed at the other end of the B segment B1S in the tunnel circumferential direction.

[0037] As shown in Fig. 4(c), a plurality of male joints 20 arranged at intervals in the tunnel circumferential direction are disposed at the shaft side end of the B segment B2S. The male joint 20 (specifically, the male pin bolt 22 described later) protrudes toward the shaft side from the shaft side end face of the B segment B2S. A plurality of female joints 30 arranged at intervals in the tunnel circumferential direction are disposed at the face side end of the B segment B2S. A plurality of steel plate type joints 50 arranged at intervals in the tunnel axial direction are disposed at both ends in the tunnel circumferential direction of the B segment B2S, respectively.

[0038] As shown in Fig. 4(d), one or more male joints 20 are disposed at the shaft side end of the K segment KS. The male joint 20 (specifically, the male pin bolt 22 described later) protrudes toward the shaft side from the shaft side end face of the K segment KS. One or more female joints 30 are disposed at the face side end of the K segment KS. A plurality of insert type joints 60 arranged at intervals in the tunnel axial direction are disposed at both ends in the tunnel circumferential direction of the K segment KS, respectively.

[0039] Next, details of the one-pass joint 10 which is a ring joint and details of the bolt joint 40 which is a segment joint will be described with reference to Figs. 5 to 10. Fig. 5 is a view showing a schematic configuration of the male joint 20 of the one-pass joint 10. Fig. 6 is a view showing a schematic configuration of the female joint 30 of the one-pass joint 10. Fig. 7 is a view showing a fastening state (fitting state) between the male joint 20 and the female joint 30 of the one-pass joint 10. Fig. 8 is a view showing a schematic configuration of the steel plate type joint 50 of the bolt joint 40. Fig. 9 is a view showing a schematic configuration of the insert type joint 60 of the bolt joint 40. Fig. 10 is a view showing a fastening state among the bolt 45, the steel plate type joint 50, and the insert type joint 60 of the bolt joint 40. Here, Figs. 5 and 6 correspond to, for example, the A-A sectional view and the B-B sectional view of Fig. 3(a). Also, Figs. 8(a) and 9 correspond to, for example, the C-C sectional view and the D-D sectional view of Fig. 3(a). Note that Fig. 8(b) is a view of the E portion in Fig. 8(a) as seen in the arrow direction.

[0040] In the following description, among the plurality of segments S (segment A1S, A2S of segment A, segment B1S, B2S of segment B, and segment KS of segment K) that constitute the lining body 9, the segments adjacent to each other in the tunnel axis direction are referred to as the first segment S1 and the second segment S2, and the segments adjacent to each other in the tunnel circumferential direction are referred to as the first segment S1 and the third segment S3. It should be noted that the second segment S2 is located closer to the shaft side than the first segment S1.

[0041] The first to third segments S1 to S3 are mainly composed of a concrete structure 70. The concrete structure 70 has an outer surface 71 on the ground side along the excavation surface of the tunnel, an inner surface 72 on the inner space side of the tunnel, an end surface 73 on the shaft side, an end surface 74 on the face side, an end surface 75 on one side in the tunnel circumferential direction, and an end surface 76 on the other side in the tunnel circumferential direction. It should be noted that the outer surface 71 and the inner surface 72 can be curved along the tunnel circumferential direction, but in FIGS. 8 to 10, for the sake of simplicity of illustration, the outer surface 71 and the inner surface 72 are shown as straight lines.

[0042] A seal groove 80 is formed in the concrete structure 70, which returns to the end surface 73 via the end surface 76, the end surface 74, and the end surface 75. Prior to the assembly of the segment ring SR, a seal member 81, for example, a water-swellable seal member, can be mounted in the seal groove 80. It is preferable that the seal groove 80 is formed closer to the ground side than the one-pass joint 10 and the bolt joint 40.

[0043] In the present embodiment, the one-pass joint 10 is a pin insertion type joint capable of connecting and fixing the first segment S1 and the second segment S2 with one touch. In the present embodiment, the one-pass joint 10 is a so-called DS (Disc Spring) joint, but it may also be a so-called SP (Smooth & Powerful) joint or the like. An example of the configuration of the DS joint is disclosed in Japanese Patent No. 4727153.

[0044] As shown in FIGS. 5 to 7, the one-pass joint 10 includes a male joint 20 provided at the end of the concrete structure 70 of the first segment S1 on the shaft end side, and a female joint 30 provided at the end of the concrete structure 70 of the second segment S2 on the face side into which the male joint 20 is inserted.

[0045] As shown in FIGS. 5 and 7, the male joint 20 includes a deformed insert 21 made of deformed reinforcing bars extending in the tunnel axis direction, and a male pin bolt 22 attached to the deformed insert 21 and extending in the tunnel axis direction. The deformed insert 21 is embedded in the end of the concrete structure 70 of the first segment S1 on the shaft end side. That is, the deformed insert 21 is embedded in the concrete constituting the first segment S1. The male pin bolt 22 has a first male thread portion 22a that screws into the female thread portion of the deformed insert 21, and a second male thread portion 22b that protrudes from the shaft end side end face 73 of the concrete structure 70 of the first segment S1 toward the shaft end side.

[0046] As shown in FIGS. 6 and 7, the female joint 30 is embedded in the end of the concrete structure 70 of the second segment S2 on the face side. That is, the female joint 30 is embedded in the concrete constituting the second segment S2. The female joint 30 has a cylindrical case 31 extending in the tunnel axis direction, a lid 32 closing the opening at the shaft end side end of the case 31, and a face plate 33 connected to the end of the case 31 on the face side and extending in the tunnel circumferential direction. A through hole 34 for inserting the second male thread portion 22b of the male pin bolt 22 of the male joint 20 is formed in the face plate 33, and this through hole 34 faces the opening at the end of the case 31 on the face side. Here, the exposed surface of the face plate 33 is substantially flush with the face side end face 74 of the concrete structure 70 of the second segment S2.

[0047] On both ends of the panel 33 in the circumferential direction of the tunnel, side plates 35 extending in the tunnel axis direction are respectively fixed. An anchor rib 36 extending in the tunnel axis direction is fixed to the side plate 35. The side plate 35 and the anchor rib 36 are embedded in the concrete structure 70. That is, the side plate 35 and the anchor rib 36 are embedded in the concrete constituting the second segment S2.

[0048] Inside the case 31, a plurality of disc spring washers 37 and washers 38 are arranged alternately from the panel 33 toward the shaft mouth side. A steel pipe 39 is interposed between the disc spring washer 37 located closest to the shaft mouth side and the lid 32.

[0049] As shown in FIG. 7, when connecting and fixing the first segment S1 and the second segment S2 via the one-pass joint 10, the second male screw portion 22b of the male pin bolt 22 of the male joint 20 passes through the through hole 34 of the panel 33 of the female joint 30 and catches on a plurality of disc spring washers 37 in the case 31. Thereby, the one-pass joint 10 can resist well against the tensile force acting in the tunnel axis direction. And at the same time when the male joint 20 and the female joint 30 constituting the one-pass joint 10 are fitted, the end face 73 on the shaft mouth side of the concrete structure 70 of the first segment S1 and the end face 74 on the face side of the concrete structure 70 of the second segment S2 (and the exposed surface of the panel 33) abut against each other, and these segments are connected and fixed to each other.

[0050] In the present embodiment, the bolt joint 40 connects and fixes the first segment S1 and the third segment S3 by bolt fastening with bolts 45.

[0051] As shown in FIGS. 8 to 10, the bolt joint 40 includes a bolt 45, a steel plate type joint 50 provided at one end of the concrete structure 70 of the first segment S1 in the circumferential direction of the tunnel, and an insert type joint 60 provided at the other end of the concrete structure 70 of the third segment S3 in the circumferential direction of the tunnel.

[0052] As shown in FIGS. 8 and 10, the steel plate joint 50 includes a joint plate 51 made of a steel plate extending in the tunnel axis direction, for example. The joint plate 51 is arranged to close the opening on the end face 75 side of a recess 77 recessed in a corner formed by the end face 75 and the inner face 72 on one side in the tunnel circumferential direction of the concrete structure 70 of the first segment S1. In other words, the back surface of the joint plate 51 faces the recess 77. Note that the front surface of the joint plate 51 (the surface on the side opposite to the aforementioned back surface) is substantially flush with the end face 75 on one side in the tunnel circumferential direction of the concrete structure 70 of the first segment S1. Further, the recess 77 opens toward the inside of the tunnel.

[0053] The recess 77 has a substantially rectangular parallelepiped-shaped space. The dimensions of the recess 77 are defined so that a bolt 45 can be inserted into this space from the inside of the tunnel. That is, the recess 77 is a so-called bolt box.

[0054] A through hole 52 for inserting the male screw portion of the bolt 45 is formed in the joint plate 51, and this through hole 52 faces the recess 77.

[0055] Side plates 53 extending in the tunnel circumferential direction are fixed to both ends in the tunnel axis direction of the back surface of the joint plate 51, respectively. Anchor bars 54 extending in the tunnel circumferential direction are fixed to the side plates 53. The side plates 53 and the anchor bars 54 are embedded in the concrete structure 70. That is, the side plates 53 and the anchor bars 54 are embedded in the concrete constituting the first segment S1.

[0056] As shown in FIGS. 9 and 10, the insert joint 60 is composed of an insert member 61 made of deformed reinforcing bars extending in the tunnel circumferential direction. The insert member 61 is embedded in the end portion on the other side in the tunnel circumferential direction of the concrete structure 70 of the third segment S3. That is, the insert member 61 is embedded in the concrete constituting the third segment S3. The insert member 61 has a female screw portion 62 into which the male screw portion of the bolt 45 is screwed. The open end of this female screw portion 62 is substantially flush with the end face 76 on the other side in the tunnel circumferential direction of the concrete structure 70 of the third segment S3.

[0057] As shown in FIG. 10, when connecting and fixing the first segment S1 and the third segment S3 via the bolt joint 40, with the through hole 52 of the joint plate 51 of the steel plate joint 50 facing the female screw portion 62 of the insert member 61 of the insert joint 60, the male screw portion of the bolt 45 is inserted into the through hole 52 of the joint plate 51 from the recess 77 of the first segment S1 and screwed into the female screw portion 62 of the insert member 61. Note that a washer 48 is interposed between the head of the bolt 45 and the joint plate 51. Then, in the bolt 45, the joint plate 51, and the insert member 61 constituting the steel plate joint 50, when the male screw portion of the bolt 45 is screwed and tightened with the female screw portion 62 of the insert member 61, at the same time, the end face 75 on one side in the tunnel circumferential direction of the concrete structure 70 of the first segment S1 (and the front face of the joint plate 51) and the end face 76 on the other side in the tunnel circumferential direction of the concrete structure 70 of the third segment S3 abut, whereby these segments are connected and fixed to each other.

[0058] By connecting and fixing the first segment S1 and the third segment S3 via the bolt joint 40, the first segment S1 and the third segment S3 can be firmly connected. This has the effect of being able to maintain the ring shape of the segment ring SR well.

[0059] By the way, conventionally, there is a segment that uses the aforementioned pin insertion type joint as the ring joint and a cone connector (cone joint) as the segment joint. For such a segment, there is also a concern about the extraction of the segment as described above due to insufficient fastening force at the cone connector. In this regard, according to the present embodiment, by using the bolt joint 40 as the segment joint, it is possible to sufficiently secure the fastening force of the segment joint, and thus prevent the occurrence of the extraction of the segment as described above. Further, by using the bolt joint 40 as the segment joint, the manufacturing cost can be suppressed as compared with the case of using a cone connector (cone joint).

[0060] According to the present embodiment, in the lining structure (lining body 9) of the tunnel formed by arranging a plurality of segments S in the tunnel circumferential direction and the tunnel axial direction and connecting them to each other, the segments S adjacent to each other in the tunnel axial direction are connected and fixed by the one-pass joint 10, and the segments S adjacent to each other in the tunnel circumferential direction are connected and fixed by the bolt joint 40. Thereby, it is possible to take measures to prevent the extraction of the segment S with a simple configuration.

[0061] Further, according to the present embodiment, the one-pass joint 10 includes a male joint 20 provided on one of the segments S adjacent to each other in the tunnel axial direction, and a female joint 30 provided on the other of the segments S adjacent to each other in the tunnel axial direction and into which the male joint 20 is inserted. Thereby, the one-pass joint 10 can be made into a simple configuration.

[0062] Further, according to the present embodiment, the bolt joint 40 includes a bolt 45, a female thread portion 62 provided on one of the segments S adjacent to each other in the tunnel circumferential direction and screwed with the male thread portion of the bolt 45, and a joint plate 51 provided on the other of the segments S adjacent to each other in the tunnel circumferential direction. A through hole 52 through which the male thread portion of the bolt 45 is inserted is formed in the joint plate 51. Thereby, the bolt joint 40 can be made into a simple configuration. Further, the bolt 45 can be easily replaced.

[0063] Also, according to the present embodiment, the segment S is made of concrete. An insert member 61 having a female screw portion 62 is embedded in the concrete (concrete structure 70) constituting the segment S. Regarding the installation location of this insert member 61, since it is not necessary to form the bolt box described above, the holes (defects) of the segment S can be reduced accordingly. That is, the smoothness of the inner surface of the segment S can be ensured. This is also advantageous in terms of strength.

[0064] Also, according to the present embodiment, the lining structure (lining body 9) of the tunnel includes a segment ring SR formed by arranging a plurality of segments S in the circumferential direction of the tunnel and connecting them to each other. The K segment KS, which is the last segment to be connected in the segment ring SR, is provided with insert members 61 (insert type joints 60) at both ends in the circumferential direction of the tunnel. The effects are as follows. Regarding the K segment KS, while being gripped by the gripping portion 7 of the erector device 6, bolt fastening (fastening using bolts 45) with the B segments B1S and B2S can be performed. Therefore, if a steel plate type joint 50 including a bolt box exists in the K segment KS, the work on the K segment KS side may become complicated. In this regard, according to the present embodiment, the K segment KS does not have a steel plate type joint 50 including a bolt box. Instead, an insert member 61 (insert type joint 60) exists, so the fastening work of the bolts 45 can be performed from the B segments B1S and B2S sides. Therefore, the complication of the above-described work can be avoided.

[0065] Also, according to the present embodiment, the method for constructing the tunnel lining structure 9 is a method of constructing the tunnel lining structure 9 by arranging a plurality of segments S in the tunnel circumferential direction and the tunnel axial direction and connecting them to each other. This method includes a step of connecting and fixing adjacent segments S in the tunnel axial direction (for example, the first segment S1 and the second segment S2) by a one-pass joint 10, and a segment S (for example, the first segment S1) connected and fixed by the one-pass joint 10 and a segment S (for example, the third segment S3) adjacent to the segment S in the tunnel circumferential direction are connected and fixed by a bolt joint 40. Thereby, with a simple configuration, it is possible to take measures to prevent the segment S from being pulled out.

[0066] In addition, in the embodiment shown in FIG. 10, the insert joint 60 provided at the end on the other side in the tunnel circumferential direction of the concrete structure 70 of the third segment S3 may be replaced with a steel plate joint 50 including a bolt box. In this case, the bolt joint 40 includes a bolt 45, a joint plate 61 provided on one of the segments S adjacent to each other in the tunnel circumferential direction, and a joint plate 61 provided on the other of the segments S adjacent to each other in the tunnel circumferential direction. The male screw portion of the bolt 45 is inserted through the through hole 62 of these joint plates 61, and the joint plates 61 can be fastened by the bolt 45 and the nut by screwing the nut onto the male screw portion.

[0067] In the present embodiment, an example in which the segment S is an RC segment is shown, but the segment S is not limited to an RC segment, and may be, for example, a steel segment or a composite segment.

[0068] The tunnel lining structure and the method for constructing the tunnel lining structure according to the present invention are preferably applied to a medium-diameter tunnel with a tunnel inner diameter of 3 m or more and 7 m or less. However, in addition, it may be applied to a small-diameter tunnel with a tunnel inner diameter of less than 3 m or a large-diameter tunnel with a tunnel inner diameter of more than 7 m.

[0069] The illustrated embodiments are merely examples of the present invention, and it goes without saying that the present invention includes various improvements and modifications made by those skilled in the art within the scope of the claims, in addition to what is directly shown by the described embodiments.

Explanation of Reference Numerals

[0070] 1... Shield tunneling machine, 2... Skin plate, 3... Propulsion jack, 4... Cylinder, 5... Rod, 6... Erector device, 7... Gripping part, 9... Lining work body, 10... One-pass joint, 20... Male joint, 21... Shaped insert, 22... Male pin bolt, 22a... First male threaded part, 22b... Second male threaded part, 30... Female joint, 31... Case, 32... Lid, 33... Panel, 34... Through hole, 35... Side plate, 36... Anchor rib, 37... Disc spring washer, 38... Washer, 39... Steel pipe, 40... Bolt joint, 45... Bolt, 48... Washer, 50... Steel plate type joint, 51... Joint plate, 52... Through hole, 53... Side plate, 54... Anchor rib, 60... Insert type joint, 61... Insert member, 62... Female threaded part, 70... Concrete structure, 71... Outer surface, 72... Inner surface, 73 - 76... End face, 77... Depression part, 80... Seal groove, 81... Seal member, A1S, A2S... A segment, B1S, B2S... B segment, KS... K segment, S... Segment, S1... First segment, S2... Second segment, S3... Third segment, SR... Segment ring, SR1... Upper set of segment rings, SR2... Lower set of segment rings, TP... Topmost

Claims

1. A lining structure for a tunnel formed by arranging a plurality of segments side by side in the circumferential direction and the axial direction of the tunnel and connecting them to each other, wherein adjacent segments in the axial direction of the tunnel are connected and fixed by a one-pass joint, adjacent segments in the circumferential direction of the tunnel are connected and fixed by a bolt joint, the one-pass joint includes, a male joint provided on one of the adjacent segments in the axial direction of the tunnel, a female joint provided on the other of the adjacent segments in the axial direction of the tunnel and into which the male joint is inserted, and is a lining structure for a tunnel.

2. The bolt joint includes, a bolt, a female thread portion provided on one of the adjacent segments in the circumferential direction of the tunnel and into which the male thread portion of the bolt is screwed, a joint plate provided on the other of the adjacent segments in the circumferential direction of the tunnel, and a through hole through which the male thread portion of the bolt is inserted is formed in the joint plate. The lining structure for a tunnel according to claim 1.

3. The segment is made of concrete, and an insert member provided with the female thread portion is embedded in the concrete constituting the segment. The lining structure for a tunnel according to claim 2.

4. The lining structure for the tunnel includes a segment ring formed by arranging a plurality of segments side by side in the circumferential direction of the tunnel and connecting them to each other, and the K segment, which is the last segment to be connected in the segment ring, is provided with the insert member at both ends in the circumferential direction of the tunnel. The lining structure for a tunnel according to claim 3.

5. A method for constructing a lining body of a tunnel by arranging a plurality of segments side by side in the circumferential direction and the axial direction of the tunnel and connecting them to each other, including the steps of connecting and fixing adjacent segments in the axial direction of the tunnel by a one-pass joint, and connecting and fixing the segment connected and fixed by the one-pass joint and a segment adjacent to the segment in the circumferential direction of the tunnel by a bolt joint, wherein the one-pass joint includes, a male joint provided on one of the adjacent segments in the axial direction of the tunnel, a female joint provided on the other of the adjacent segments in the axial direction of the tunnel and into which the male joint is inserted, and is a method for constructing a lining body of a tunnel. ​ ​

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