Connection structure of segments for tunnel lining

Abstract

To prevent an existing segment from protruding to a face side when a propulsion jack of a shield machine is released.SOLUTION: A connection structure 1 is a structure that connects a pair of segments 11, 13 aligned in the tunnel axial direction. A connection structure 1 comprises connecting jigs 2F, 2R detachably attached to inner surfaces 11a, 13a of the segments 11, 13 on an inner side of a tunnel, and a rod-shaped member 3 provided so as to straddle between the connecting jigs 2F, 2R detachably attached to the segments 11, 13.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a connection structure of segments for tunnel lining.

Background Art

[0002] A shield tunnel used as a pipeline such as a sewer, 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 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 this 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] In this regard, paragraphs 0004 and FIG. 6 of Patent Document 1 disclose that in the segment assembling method, a plurality of segments are successively connected in the circumferential direction of the tunnel from the lower part inside the tunnel, a space corresponding to the outer shape of the key segment is formed between the segments at the upper part inside the tunnel, and the segment ring is constructed by inserting the key segment into this space in the axial direction of the tunnel.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, for example, when constructing a segment ring or when the shield tunneling machine reaches the access shaft, if the propulsion jack is released from the existing segment behind it, there is a risk that the existing segment at the released location will protrude forward (face side) from the segment ring behind it.

[0007] In view of such a situation, an object of the present invention is to prevent the existing segment from protruding toward the face side when the propulsion jack is released.

Means for Solving the Problems

[0008] Therefore, the connection structure of the segments for tunnel lining in the first and second aspects of the present invention is a structure for connecting a pair of segments arranged in the tunnel axis direction. 。 This In the First connection structure of the segments for tunnel lining in the aspect of the invention, a connecting jig detachably attached to a recess provided on the inner surface of each segment on the inner space side of the tunnel, and a rod-shaped member provided so as to straddle the connecting jigs detachably attached to each segment are provided. The recess includes an opening opened on the inner surface, the opening has an elongated hole shape that is long in the tunnel axis direction, the connecting jig has an insertion portion inserted into the recess from the opening side, the connecting jig further has a spacer member that fills a gap between the insertion portion and the inner wall of the opening, and the spacer member restricts the movement of the insertion portion in the tunnel axis direction with respect to the opening. The connection structure of segments for tunnel lining in the second aspect of the present invention includes a connection jig detachably attached to the inner surface on the inner space side of the tunnel of each segment, and a rod-shaped member provided so as to straddle the connection jigs detachably attached to each segment. One or more segments are arranged between the pair of segments. The connection jig includes a base portion detachably attached to the inner surface, and a turning portion rotatably attached to the base portion with respect to the base portion. An end portion of the rod-shaped member is detachably fixed to the turning portion.

Effects of the Invention

[0009] According to the present invention, a pair of segments arranged in the tunnel axis direction are connected by a rod-shaped member via a connecting jig. Therefore, when the propulsion jack is released, it is possible to prevent one segment from protruding toward the face side with respect to the other segment.

Brief Description of the Drawings

[0010] [Figure 1] Expanded view of the tunnel inner surface in an embodiment of the present invention [Figure 2] Diagram showing the schematic configuration of the connection structure in the first embodiment of the present invention [Figure 3] Diagram showing the schematic configuration of the concave portion of the segment in the first embodiment [Figure 4] Diagram showing the schematic configuration of the engaging member in the first embodiment [Figure 5] Diagram showing the schematic configuration of the spacer member in the first embodiment [Figure 6] Diagram showing the schematic configuration of the mounting member in the first embodiment [Figure 7] Diagram showing the installation method of the connection structure in the first embodiment [Figure 8] Diagram showing the installation method of the connection structure in the first embodiment [Figure 9] Diagram showing the installation method of the connection structure in the first embodiment [Figure 10] Diagram showing the installation method of the connection structure in the first embodiment [Figure 11] Diagram showing the schematic configuration of the connection structure in the second embodiment of the present invention

Embodiments for Carrying Out the Invention

[0011] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an expanded view of the tunnel inner surface in an embodiment of the present invention, and shows the schematic configuration of the connection structure in the embodiment of the present invention. In the following description, for convenience, the tunnel excavation direction is defined as the forward direction, and the front and rear are specified. That is, the "face side" corresponds to the "front side", and the "shaft side" corresponds to the "rear side".

[0012] Although the illustration is omitted, the shield tunneling machine used for constructing a tunnel includes a cylindrical (for example, circular) skin plate forming its main body, a cutting head for excavation provided at the front end of the skin plate, and an erector device disposed within the skin plate behind the cutting head. The erector device can grip a segment having an arcuate cross-section obtained by dividing a tunnel cross-section into a plurality of parts with the gripping part of the erector device, and can appropriately move the segment mainly in the circumferential direction of the tunnel, and also in the tunnel axial direction and the inner-outer direction (for example, radial direction). The erector device connects a plurality of segments along its circumferential direction within the skin plate, and finally constructs a segment ring by inserting a key segment (insertion type segment) between the segments from the front side in the tunnel axial direction. By sequentially constructing this segment ring in the tunnel axial direction, a cylindrical (for example, circular) lining body 10 (see FIG. 1) is constructed.

[0013] Here, the area in front of the broken line M shown in FIG. 1 (the face side) indicates the area within the skin plate. Also, the n-1 ring to n-4 rings shown in FIG. 1 are existing segment rings, and the n ring shown in FIG. 1 is a segment ring under assembly (under construction). The n ring to n-4 rings are arranged in order from the front side to the rear side. Note that FIG. 1 shows an example where there are four rings of existing segment rings (n-1 ring to n-4 rings), but the number of rings of the existing segment rings may be two or more.

[0014] The segments 11, 12, 13 shown in FIG. 1 are arranged in the tunnel axial direction, and each constitutes the n-1 ring to n-3 rings. Here, the segments 11, 13 are key segments.

[0015] Inside the skin plate of the shield tunneling machine, a plurality of propulsion jacks 80 are arranged at intervals from each other in the circumferential direction along the inner surface of the skin plate.

[0016] The propulsion jack 80 is a hydraulic jack composed of a cylinder and a rod. One end of the cylinder is fixed to the skin plate, and the rod can advance and retract at the other end side. By extending the propulsion jack 80 with the tip of the rod of the propulsion jack 80 abutted against an existing segment, the shield tunneling machine can obtain propulsion force.

[0017] For example, as shown in FIGS. 1(A) and 1(B), when assembling the n-ring, if the propulsion jack 80 in contact with the segment 11 constituting the n-1 ring is released from the segment 11, a phenomenon may occur in which the segment 11 protrudes (slips out) forward. In order to prevent the occurrence of this slipping-out phenomenon, in the present embodiment, a connecting structure (connecting device) 1 is adopted as a structure for connecting segments for tunnel lining.

[0018] The connecting structure 1 includes a pair of front and rear connecting jigs 2 (2F, 2R) and a rod-shaped member 3. The front connecting jig 2F is detachably attached to the inner surface 11a on the inner space side of the tunnel of the segment 11. The rear connecting jig 2R is detachably attached to the inner surface 13a on the inner space side of the tunnel of the segment 13.

[0019] The rod-shaped member 3 is made of, for example, metal, has rigidity, and extends in the tunnel axis direction. The rod-shaped member 3 is provided so as to straddle between the connecting jigs 2F and 2R. The rod-shaped member 3 is disposed on the inner space side of the tunnel rather than the inner surfaces 11a, 12a, and 13a of the segments 11, 12, and 13 and is exposed.

[0020] FIG. 2 shows a schematic configuration of the connecting structure 1 in the first embodiment of the present invention. Specifically, FIG. 2(A) is a cross-sectional view showing the segments 11 to 13 provided with the connecting structure 1, and FIG. 2(B) is a partially enlarged view of the portion P in FIG. 2(A).

[0021] In the present embodiment, although the following description is given assuming that segments 11 to 13 are RC segments (i.e., made of concrete), segments 11 to 13 are not limited to RC segments and may be steel segments or composite segments in which concrete is filled inside steel segments.

[0022] In Fig. 2(A), the inner surfaces 11a, 12a, 13a of segments 11, 12, 13, the recesses 11b, 12b, 13b provided on the inner surfaces 11a, 12a, 13a, and the outer surfaces 11c, 12c, 13c on the ground side are shown. The connecting jig 2F is detachably fixed to the recess 11b. The connecting jig 2R is detachably fixed to the recess 13b. The recesses 11b, 12b, 13b in the present embodiment can function as the gripping holes for the twist-lock type gripping portion of the aforementioned erector device.

[0023] Fig. 3 shows the schematic configuration of the recess 13b of segment 13. Here, Fig. 3(A) corresponds to the portion P of Fig. 2(A). Also, Fig. 3(A) corresponds to the A-A cross-section of Fig. 3(B).

[0024] The recess 13b has a pot-shaped receiving member 16. The receiving member 16 is made of, for example, metal and has an opening 16a in the shape of a long hole that is long in the tunnel axis direction (i.e., a shape that is short in the tunnel circumferential direction compared to the length in the tunnel axis direction), a curved surface portion 16b having a hemispherical inner surface, a cylindrical main body portion 16c, and a bottom portion 16d. The ground side of the main body portion 16c is closed by the bottom portion 16d, and the inside of the tunnel side of the main body portion 16c opens at the opening 16a via the curved surface portion 16b. The opening 16a opens to the inner surface 13a of segment 13 (for example, the concave surface 13t that constitutes a part of the inner surface 13a).

[0025] Regarding the pot-shaped receiving member 16 in which the main body portion 16c has a cylindrical shape, the opening 16a on the entrance side is narrowed to a long hole shape that is long in the tunnel axis direction. The length of the opening 16a in the tunnel axis direction is equal to the diameter of the inner peripheral surface of the main body portion 16c.

[0026] In this embodiment, since segment 13 is an RC segment, the receiving member 16 is embedded in the concrete constituting segment 13. If segment 13 were a steel segment, the receiving member 16 could be exposed. Also, if segment 13 were a composite segment, the receiving member 16 could be embedded in the concrete constituting the composite segment.

[0027] Since the configurations of recesses 11b and 12b are the same as that of recess 13b, the description thereof will be omitted.

[0028] As shown in Fig. 2(A), the connecting jig 2R (connecting jig 2) includes an engaging member 20, a spacer member 30, and a mounting member 40. The schematic configurations of each of the engaging member 20, the spacer member 30, and the mounting member 40 are shown in Figs. 4 to 6. Here, Figs. 4(A) to (C) are a plan view, a front view, and a side view of the engaging member 20. Figs. 5(A) and (B) are a plan view and a front view of the spacer member 30. Figs. 6(A) to (C) are a plan view, a front view, and a side view of the mounting member 40.

[0029] The engaging member 20 is made of, for example, metal and includes a male screw portion 21 and an insertion portion 22 attached to one side of the male screw portion 21. The insertion portion 22 is the portion of the engaging member 20 that is inserted into the aforementioned receiving member 16. The insertion portion 22 has a flat portion 22a and a neck portion 22b. The flat portion 22a has a cross-sectional shape corresponding to the elongated hole shape of the opening 16a of the receiving member 16. A curved surface 22c is formed on the neck portion 22b side of the flat portion 22a. This curved surface 22c can abut against the curved surface portion 16b of the receiving member 16.

[0030] The spacer member 30 is made of, for example, metal, and has a circular plate-like portion 31, a pair of protruding portions 32 erected from one surface of the plate-like portion 31, and a through-hole 33 penetratingly formed at the center of the plate-like portion 31. The protruding portions 32 of the spacer member 30 are arranged on both sides of the through-hole 33 in a plan view. The protruding portions 32 of the spacer member 30 are configured to be able to close the gap between the neck portion 22b of the engaging member 20 and the inner wall of the opening 16a of the receiving member 16 (see Fig. 9(A) described later). The male screw portion 21 of the engaging member 20 is inserted into the through-hole 33.

[0031] The mounting member 40 is made of, for example, metal, and includes a rectangular plate-like base portion 41 and a rectangular plate-like wall portion 42 erected from one surface of the base portion 41. A through-hole 41a for inserting the male screw portion 21 of the engaging member 20 is penetratingly formed in the base portion 41. A through-hole 42a for inserting the rod-shaped member 3 is penetratingly formed in the wall portion 42. A reinforcing plate 43 is provided to reinforce the corner portion formed by the base portion 41 and the wall portion 42. The other surface of the base portion 41 may be in contact with the inner surface 13a of the segment 13.

[0032] Note that since the connecting jig 2F has the same configuration as the connecting jig 2R, the description thereof is omitted.

[0033] Next, the installation method of the connection structure 1 in the present embodiment will be described with reference to Figs. 7 to 10. Here, Figs. 7(A), 8(A), 9(A), 10(A) and (B) correspond to Fig. 3(A) (i.e., the portion P of Fig. 2(A)) described above. Also, Figs. 7(B), 8(B), and 9(B) correspond to Fig. 3(B) described above.

[0034] The installation of this connection structure 1 is carried out prior to the release of the propulsion jack 80 shown in Fig. 1 from the segment 11. First, as shown in Fig. 7, the insertion portion 22 of the engaging member 20 is inserted into the main body portion 16c of the receiving member 16 from the side of the opening 16a of the receiving member 16. At the time of this insertion, the direction of the flat portion 22a of the insertion portion 22 of the engaging member 20 is such that its flat cross-section coincides with the elongated hole shape of the opening 16a of the receiving member 16.

[0035] Next, as shown in FIG. 8, the engaging member 20 is rotated 90° about the central axis of the male screw portion 21, and the curved surface 22c of the flat portion 22a of the engaging member 20 is brought into contact with the curved surface portion 16b of the receiving member 16. At this time, as shown in FIG. 8(A), in the tunnel circumferential direction, the flat portion 22a and the head portion 22b of the engaging member 20 are engaged with the main body portion 16c, the curved surface portion 16b, and the opening portion 16a of the receiving member 16. Therefore, the movement of the engaging member 20 in the tunnel circumferential direction with respect to the receiving member 16 is restricted. On the other hand, in the tunnel axial direction, as shown in FIG. 8(I), a gap is formed between the head portion 22b of the engaging member 20 and the inner wall of the opening portion 16a of the receiving member 16. Therefore, play of the engaging member 20 in the tunnel axial direction with respect to the receiving member 16 may occur.

[0036] To prevent the occurrence of this play, as shown in FIG. 9, a spacer member 30 is attached so as to close the gap. At this time, the male screw portion 21 of the engaging member 20 is inserted into the through hole 33 of the plate-like portion 31 of the spacer member 30, and the spacer member 30 is fixed by a nut 51 that screws onto the male screw portion 21. By attaching this spacer member 30, the movement of the engaging member 20 with respect to the receiving member 16, mainly in the tunnel axial direction, is restricted. Note that the shape of the opening portion 16a is not limited to a long hole, and the spacer member 30 may be one that closes the gap between the head portion 22b of the engaging member 20 and the inner wall of the opening portion 16a of the receiving member 16.

[0037] Next, as shown in FIG. 10(A), the male screw portion 21 of the engaging member 20 is inserted into the through hole 41a of the base portion 41 of the attachment member 40, and the attachment member 40 is fixed to the engaging member 20 by tightening a nut 52 that screws onto the male screw portion 21. When fixing, the orientation of the attachment member 40 can be adjusted so that the through hole 42a of the wall portion 42 of the attachment member 40 faces in the tunnel axial direction. In this way, the connecting jig 2R is detachably attached to the inner surface 13a of the segment 13.

[0038] Since the method of detachably attaching the connecting jig 2F to the inner surface 11a of the segment 11 is the same as the method of detachably attaching the connecting jig 2R to the inner surface 13a of the segment 13, the description thereof will be omitted.

[0039] Prior to detachably attaching the connecting jig 2F to the inner surface 11a of the segment 11, the connecting jig 2R may be detachably attached to the inner surface 13a of the segment 13, or vice versa. Also, the detachably attaching of the connecting jig 2F to the inner surface 11a of the segment 11 and the detachably attaching of the connecting jig 2R to the inner surface 13a of the segment 13 may be performed simultaneously.

[0040] After detachably attaching the connecting jigs 2F and 2R to the inner surfaces 11a and 13a of the segments 11 and 13, as shown in Fig. 10(A), the male screw portions 3a at both ends of the rod-shaped member 3 are inserted through the through holes 42a in the wall portions 42 of the respective mounting members 40 of the connecting jigs 2F and 2R, and the rod-shaped member 3 is fixed to the mounting member 40 by tightening the nut 53 that screws onto the male screw portion 3a. In this way, the installation of the connecting structure 1 is carried out.

[0041] After the installation of the connecting structure 1 is completed, the propulsion jack 80 is released from the segment 11. The connecting structure 1 can be removed from the segments 11 and 13 at any time after at least the assembly of n rings is completed.

[0042] According to this embodiment, the connection structure 1 of segments for tunnel lining is a structure for connecting a pair of segments 11 and 13 arranged in the tunnel axis direction. The connection structure 1 includes connection jigs 2F and 2R that are detachably attached to the inner surfaces 11a and 13a on the inner space side of each segment 11 and 13, and a rod-shaped member 3 provided so as to straddle the connection jigs 2F and 2R detachably attached to each segment 11 and 13. Therefore, the segments 11 and 13 arranged in the tunnel axis direction are connected by the rod-shaped member 3 via the connection jigs 2F and 2R. Accordingly, when the propulsion jack 80 is released from the segment 11, it is possible to prevent the segment 11 from protruding toward the face side with respect to the segments 12 and 13 (in other words, it is possible to prevent the segment 11 from coming out of the n - 1 ring toward the face side). Thus, it is possible to prevent the occurrence of gaps between segment rings.

[0043] Also according to this embodiment, the connection jigs 2F and 2R are detachably fixed to the recesses 11b and 13b provided on the inner surfaces 11a and 13a of the segments 11 and 13. By detachably fixing the connection jigs 2F and 2R to the recesses 11b and 13b provided as the gripping holes for the gripping portions of the aforementioned erector device, the gripping holes can be effectively utilized.

[0044] Also according to this embodiment, the recesses 11b and 13b include openings 16a that open to the inner surfaces 11a and 13a of the segments 11 and 13. The connection jigs 2F and 2R have insertion portions 22 that are inserted into the recesses 11b and 13b (inside the main body portion 16c) from the opening 16a side. The connection jigs 2F and 2R have spacer members 30 that close the gap between the insertion portions 22 and the inner walls of the openings 16a. By this spacer member 30, the movement of the insertion portion 22 with respect to the opening 16a can be restricted.

[0045] Also according to this embodiment, the opening 16a has an elongated hole shape that is long in the tunnel axis direction. The movement of the insertion portion 22 in the tunnel axis direction with respect to the opening 16a having such a shape can be restricted by the spacer member 30.

[0046] Next, a second embodiment of the present invention will be described with reference to FIG. 11. FIG. 11 shows a schematic configuration of the connection structure 1 in this embodiment. Specifically, FIG. 11(A) is a side view of the connection jig 2R (connection jig 2) constituting the connection structure 1, and FIG. 11(B) is a plan view of the connection jig 2R (connection jig 2). Differences from the above-described first embodiment will be described.

[0047] The recess 13b provided on the inner surface 13a of the segment 13 has a cylindrical receiving member 17 having a female screw portion 17a on the tunnel inner space side. The receiving member 17 is made of, for example, metal or resin, and extends so as to penetrate from the inner surface 13a to the outer surface 13c of the segment 13. The opening on the tunnel inner space side of the receiving member 17 opens to the inner surface 13a of the segment 13 (for example, the concave surface 13t constituting a part of the inner surface 13a).

[0048] The recess 13b having the receiving member 17 can function as a gripping hole for the gripping portion of the erector device described above. In addition to or instead of this, the recess 13b having the receiving member 17 can function as an injection pipe for injecting grout material. Here, the grout material (backfilling material) is injected into the gap between the ground excavated by the shield tunneling machine and the lining body 10.

[0049] The recesses 11b and 12b provided on the inner surfaces 11a and 12a of the segments 11 and 12 have the same configuration as the recess 13b (having the receiving member 17) provided on the inner surface 13a of the segment 13.

[0050] The connection jig 2R includes a base portion 60 detachably attached to the inner surface 13a of the segment 13, and a turning portion 70 attached to the base portion 60 so as to be turnable with respect to the base portion 60.

[0051] The base 60 includes a disc-shaped handle cover 61, a plurality (four in FIG. 11) of handles 62 erected on one surface of the handle cover 61, a swivel portion mounting portion 63 erected at the center of one surface of the handle cover 61 and having a male screw portion 63a on the tip side, and an engaging portion 64 erected from the center of the other surface of the handle cover 61 and having a male screw portion 64a on the tip side.

[0052] The male screw portion 64a of the engaging portion 64 of the base 60 is screwed into the female screw portion 17a of the receiving member 17 of the recess 13b. The handle cover 61 of the base 60 is configured to cover the concave surface 13t, and a sealing member 65 such as a rubber packing is interposed between the outer peripheral edge portion of the other surface of the handle cover 61 and the inner surface 13a of the segment 13.

[0053] The swivel portion 70 includes a rectangular plate-shaped bottom portion 71, a pair of wall portions 72 erected on one surface of the bottom portion 71 and facing each other with a space therebetween, and a pair of plate members 73 for reinforcing the wall portions 72. Here, in FIG. 11(A), for simplicity of illustration, the illustration of the plate member 73 is omitted.

[0054] A through hole 71a through which the proximal end side of the swivel portion mounting portion 63 is loosely fitted is formed through the center portion of the bottom portion 71. A through hole 72a for inserting the rod-shaped member 3 is formed through the wall portion 72.

[0055] With the proximal end side of the swivel portion mounting portion 63 loosely fitted in the through hole 71a of the bottom portion 71 of the swivel portion 70, a nut 75 that is screwed into the male screw portion 63a of the swivel portion mounting portion 63 is attached together with a washer 76, so that the swivel portion 70 is attached to the base 60 in a state where it can swivel around the central axis of the swivel portion mounting portion 63.

[0056] In this embodiment, since the segment 13 is an RC segment, the receiving member 17 is embedded in the concrete constituting the segment 13. If the segment 13 were a steel segment, the receiving member 17 could be exposed. Also, if the segment 13 were a composite segment, the receiving member 17 could be embedded in the concrete constituting the composite segment.

[0057] Also, since the connecting jig 2F that is detachably attached to the inner surface 11a of the segment 11 has the same configuration as the connecting jig 2R (including the base 60 and the turning part 70), the description thereof will be omitted.

[0058] Particularly according to the present embodiment, the recesses 11b and 13b provided on the inner surfaces 11a and 13a of the segments 11 and 13 have female screw portions 17a. The connecting jigs 2F and 2R have male screw portions 64a that are screwed into the female screw portions 17a. Thereby, with a simple configuration, the connecting jigs 2F and 2R can be detachably fixed to the recesses 11b and 13b.

[0059] Also according to the present embodiment, the connecting jigs 2F and 2R include a base 60 that is detachably attached to the inner surfaces 11a and 13a of the segments 11 and 13, and a turning part 70 that is turnably attached to the base 60 with respect to the base 60. The end of the rod-shaped member 3 is detachably fixed to the turning part 70 (see Fig. 11(A)). Therefore, the turning part 70 can be appropriately turned with respect to the base 60 so that the attachment of the rod-shaped member 3 to the turning part 70 can be performed smoothly.

[0060] In each of the above-described embodiments, the segment 12 is disposed between the segment 11 to which the connecting jig 2F is detachably fixed and the segment 13 to which the connecting jig 2R is detachably fixed. However, two or more segments may be disposed between the segment to which the connecting jig 2F is detachably fixed and the segment to which the connecting jig 2R is detachably fixed, or the segment to which the connecting jig 2F is detachably fixed and the segment to which the connecting jig 2R is detachably fixed may be adjacent to each other in the tunnel axis direction. That is, for example, the connecting jig 2F may be detachably fixed to the segment 11 and the connecting jig 2R may be detachably fixed to the segment 12.

[0061] Also, in each of the above-described embodiments, both of the connecting jigs 2F and 2R are detachably attached to the key segment, but at least one of the connecting jigs 2F and 2R may be detachably attached to a segment other than the key segment.

[0062] Also, in each of the above-described embodiments, an example has been described in which the connection structure 1 is installed prior to releasing the propulsion jack 80 from the segment 11 during the assembly of the n-ring. However, the case where the connection structure 1 is installed is not limited to this. For example, when all the propulsion jacks 80 are released from the existing segments behind them upon reaching the access shaft of the shield tunneling machine, a plurality of connection structures 1 may be installed at intervals in the circumferential direction of the tunnel so as to attach a plurality of connecting jigs 2F at intervals in the circumferential direction of the tunnel with respect to the segment ring located at the foremost side prior to the release. Thereby, it is possible to prevent the occurrence of an opening between the segment rings when all the propulsion jacks 80 are released from the segment ring located at the foremost side.

[0063] As is clear from the above description, the illustrated embodiments are merely illustrative 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 those directly shown by the described embodiments. Incidentally, the claims at the time of filing were as follows. [Claim 1] A structure for connecting a pair of segments arranged in the tunnel axis direction, a connection jig detachably attached to the inner surface on the inner space side of the tunnel of each segment, and a rod-shaped member provided so as to straddle the connection jigs detachably attached to each segment, comprising a connection structure of segments for tunnel lining. [Claim 2] The connection structure of segments for tunnel lining according to claim 1, wherein the connection jig is detachably fixed to a recess provided on the inner surface of the segment. [Claim 3] The recess includes an opening opened on the inner surface of the segment, the connection jig has an insertion portion inserted into the recess from the opening side, and the connection structure of segments for tunnel lining according to claim 2, wherein the connection jig further has a spacer member for closing a gap between the insertion portion and the inner wall of the opening. [Claim 4] The connection structure of segments for tunnel lining according to claim 3, wherein the opening has an elongated hole shape that is long in the tunnel axis direction. [Claim 5] The recess has a female screw portion, and the connection structure of segments for tunnel lining according to claim 2, wherein the connection jig has a male screw portion screwed into the female screw portion. [Claim 6] The connection jig includes a base portion detachably attached to the inner surface of the segment, and a turning portion rotatably attached to the base portion with respect to the base portion. The connection structure of segments for tunnel lining according to any one of claims 1 to 5, wherein an end portion of the rod-shaped member is detachably fixed to the turning portion.

Explanation of Symbols

[0064] 1... Connecting structure, 2, 2F, 2R... Connecting jig, 3... Rod-shaped member, 3a... Male thread portion, 10... Covering member, 11, 12, 13... Segments, 11a, 12a, 13a... Inner surfaces, 11b, 12b, 13b... Recessed portions, 11c, 12c, 13c... Outer surfaces, 16... Receiving member, 16a... Opening, 16b... Curved surface portion, 16c... Main body portion, 16d... Bottom portion, 17... Receiving member, 17a... Female thread portion, 20... Engaging member, 21... Male thread portion, 22... Insertion portion, 22a... Flat portion, 22b... Head portion, 22c... Curved surface, 30... Spacer member, 31... Plate-like portion, 32... Protrusion, 33... Through hole, 40... Mounting member, 41... Base portion, 41a... Through hole, 42... Wall portion, 42a... Through hole, 43... Reinforcing plate, 51 - 53... Nuts, 60... Base portion, 61... Handle cover, 62... Handle, 63... Swivel portion mounting portion, 63a... Male thread portion, 64... Engaging portion, 64a... Male thread portion, 65... Sealing member, 70... Swivel portion, 71... Bottom portion, 71a... Through hole, 72... Wall portion, 72a... Through hole, 73... Plate member, 75... Nut, 76... Washer, 80... Propelling jack

Claims

1. A structure for connecting a pair of segments arranged in the tunnel axis direction, a connecting jig detachably attached to a recess provided on the inner surface of each segment on the inner space side of the tunnel, a rod-shaped member provided so as to straddle the connecting jigs detachably attached to each segment, comprising: the recess includes an opening opening to the inner surface, the opening has an elongated hole shape that is long in the tunnel axis direction, the connecting jig has an insertion portion inserted into the recess from the opening side, the connecting jig further has a spacer member that closes a gap between the insertion portion and the inner wall of the opening, and the spacer member restricts movement of the insertion portion in the tunnel axis direction with respect to the opening. A connecting structure for tunnel lining segments.

2. The connecting structure for tunnel lining segments according to Claim 1, wherein one or more segments are arranged between the pair of segments.

3. A structure for connecting a pair of segments arranged in the tunnel axis direction, a connecting jig detachably attached to the inner surface of each segment on the inner space side of the tunnel, a rod-shaped member provided so as to straddle the connecting jigs detachably attached to each segment, comprising: In the connecting structure for tunnel lining segments, wherein one or more segments are arranged between the pair of segments, the connecting jig includes a base detachably attached to the inner surface, and a turning portion turnably attached to the base with respect to the base, the connecting structure for tunnel lining segments, wherein an end portion of the rod-shaped member is detachably fixed to the turning portion.

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