JP7699501B2 - Segment connection structure for tunnel lining - Google Patents

Description

The present invention relates to a connection structure for segments used in tunnel linings.

Shield tunnels, which are used as pipelines for water supply and sewage systems, utility conduits, roads, railways, etc., are constructed using the shield method.
The shield tunneling method uses a shield machine that includes, for example, a cylindrical skin plate, a cutter head that is provided at the front end (the end on the face side) of the skin plate to excavate the natural ground, and a driving jack that is provided inside the skin plate.

In the shield method, for example, a starting shaft and a destination shaft are constructed in the ground, and while the shield tunneling machine excavates the ground from the starting shaft to the destination shaft, segments are connected one after another at the rear of the skin plate in the circumferential direction of the tunnel to construct segment rings, and adjacent segment rings are connected in the axial direction of the tunnel to construct a cylindrical lining. In this method, the shield tunneling machine pushes the existing segment behind it backwards with a thrust jack, and the thrust generated as a reaction force moves the shield tunneling machine forward while excavating the ground.

In this regard, paragraph 0004 and Figure 6 of Patent Document 1 disclose a segment assembly method in which multiple segments are sequentially connected from the lower part of the tunnel in the circumferential direction of the tunnel, a void corresponding to the external shape of the key segment is formed between the upper segments in the tunnel, and the key segment is inserted into this void in the axial direction of the tunnel to construct a segment ring.

Japanese Patent Application Publication No. 5-133196

However, for example, when constructing a segment ring or when the shield tunneling machine reaches the arrival shaft, if the driving jack is released from the existing segment behind it, there is a risk that the existing segment at the released point will protrude forward (towards the face) from the segment ring behind it.

In view of this situation, the present invention aims to prevent existing segments from protruding toward the face when the propulsion jack is released.

Therefore, the connecting structure of segments for a tunnel lining in the first and second aspects of the present invention is a structure for connecting a pair of segments aligned in the tunnel axis direction .
The connecting structure of segments for a tunnel lining in a first aspect of the present invention comprises a connecting jig that is detachably attached to a recess provided on the inner surface of each segment facing the tunnel interior, and a rod-shaped member that is arranged to straddle the connecting jigs that are detachably attached to each segment, wherein the recess includes an opening that opens into the inner surface, the opening being a long hole shape that is long in the tunnel axial direction, the connecting jig has an insertion portion that is inserted into the recess from the opening side, and the connecting jig further has a spacer member that fills the gap between the insertion portion and the inner wall of the opening, and the spacer member limits movement of the insertion portion in the tunnel axial direction relative to the opening.
A tunnel lining segment connection structure according to a second aspect of the present invention comprises a connection jig detachably attached to the inner surface of each segment facing the tunnel interior, and a rod-shaped member arranged to straddle the connection jigs detachably attached to each segment, with one or more segments disposed between the pair of segments. The connection jig comprises a base detachably attached to the inner surface and a swivel part attached to the base so as to be rotatable relative to the base, and an end of the rod-shaped member is detachably fixed to the swivel part.

According to the present invention, a pair of segments aligned in the tunnel axial direction are connected by a rod-shaped member via a connecting jig. Therefore, when the driving jack is released, it is possible to prevent one segment from protruding toward the face relative to the other segment.

An exploded view of the inner surface of a tunnel according to an embodiment of the present invention. FIG. 1 is a diagram showing a schematic configuration of a connection structure according to a first embodiment of the present invention; FIG. 1 is a diagram showing a schematic configuration of a recess of a segment in the first embodiment; FIG. 2 is a schematic diagram showing a configuration of an engagement member according to the first embodiment; FIG. 1 is a diagram showing a schematic configuration of a spacer member in the first embodiment; FIG. 1 is a diagram showing a schematic configuration of a mounting member in the first embodiment; FIG. 13 is a diagram showing a method of installing the connecting structure in the first embodiment. FIG. 13 is a diagram showing a method of installing the connecting structure in the first embodiment. FIG. 13 is a diagram showing a method of installing the connecting structure in the first embodiment. FIG. 13 is a diagram showing a method of installing the connecting structure in the first embodiment. FIG. 13 is a diagram showing a schematic configuration of a connection structure according to a second embodiment of the present invention;

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a development of the inner surface of a tunnel according to an embodiment of the present invention, showing a schematic configuration of a connection structure according to an embodiment of the present invention. In the following description, for convenience, the front and rear are defined with the tunnel excavation direction as the forward direction. In other words, the "face side" corresponds to the "front side" and the "pithead side" corresponds to the "rear side".

Although not shown in the figures, the shield machine used to construct the tunnel comprises a tubular (e.g., cylindrical) skin plate that forms the main body of the machine, a cutter head for excavation that is provided at the front end of the skin plate, and an erector device that is arranged inside the skin plate behind the cutter head. The erector device grips segments with arc-shaped cross sections that divide the tunnel cross section into multiple parts with its gripping part, and can move the segments mainly in the tunnel circumferential direction, in the tunnel axial direction, and inward and outward directions (e.g., radial directions) as appropriate. The erector device connects multiple segments in the skin plate along the circumferential direction, and finally constructs a segment ring by inserting a key segment (insertable segment) between the segments from the front side in the tunnel axial direction. The segment rings are constructed sequentially in the tunnel axial direction to construct a tubular (e.g., cylindrical) lining body 10 (see FIG. 1).

Here, the area in front of the dashed line M in Figure 1 (the face side) indicates the area inside the skin plate. Furthermore, ring n-1 to ring n-4 shown in Figure 1 are existing segment rings, and ring n shown in Figure 1 is a segment ring in the process of assembly (construction). Ring n to ring n-4 are lined up in order from the front to the rear. Note that while Figure 1 shows an example where there are four existing segment rings (ring n-1 to ring n-4), the number of rings in the existing segment rings can be two or more.

Segments 11, 12, and 13 shown in Figure 1 are aligned in the tunnel axis direction, and each constitutes ring n-1 to ring n-3. Here, segments 11 and 13 are key segments.

A number of thrust jacks 80 are arranged inward from the skin plate of the shield tunneling machine, spaced apart from one another in the circumferential direction along the inner surface of the skin plate.

The propulsion jack 80 is a hydraulic jack consisting of a cylinder and a rod. One end of the cylinder is fixed to the skin plate, and the rod can be advanced and retracted at the other end. The shield tunneling machine can obtain propulsive force by extending the propulsion jack 80 with the tip of the rod of the propulsion jack 80 in contact with an existing segment.

For example, as shown in Figures 1(A) and (B), when assembling the n ring, if the propulsion jack 80 that is in contact with the segment 11 that constitutes the n-1 ring is released from the segment 11, the segment 11 may protrude (slip out) to the front. To prevent this from happening, in this embodiment, a connecting structure (connecting device) 1 is used as a structure for connecting the tunnel lining segments.

The connecting structure 1 comprises 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 of the segment 11 on the tunnel interior space side. The rear connecting jig 2R is detachably attached to the inner surface 13a of the segment 13 on the tunnel interior space side.

The rod-shaped member 3 is made of, for example, metal, has rigidity, and extends in the tunnel axial direction. The rod-shaped member 3 is arranged to straddle the connecting jigs 2F and 2R. The rod-shaped member 3 is positioned closer to the tunnel interior than the inner surfaces 11a, 12a, and 13a of the segments 11, 12, and 13, and is exposed.

Figure 2 shows a schematic configuration of the connecting structure 1 in the first embodiment of the present invention. In detail, Figure 2(A) is a cross-sectional view showing segments 11 to 13 provided with the connecting structure 1, and Figure 2(B) is a partial enlarged view of part P in Figure 2(A).

In this embodiment, the following description will be given assuming that segments 11 to 13 are RC segments (i.e. made of concrete), but segments 11 to 13 are not limited to RC segments and may be steel segments or composite segments in which concrete is filled inside a steel segment.

Figure 2 (A) shows the inner surfaces 11a, 12a, 13a of the segments 11, 12, 13, the recesses 11b, 12b, 13b provided in the inner surfaces 11a, 12a, 13a, and the outer surfaces 11c, 12c, 13c on the natural ground side. The connecting jig 2F is removably fixed to the recess 11b. The connecting jig 2R is removably fixed to the recess 13b. In this embodiment, the recesses 11b, 12b, 13b can function as gripping holes for the twist-lock type gripping part of the erector device described above.

Figure 3 shows a schematic configuration of the recess 13b of the segment 13. Here, Figure 3(A) corresponds to part P in Figure 2(A). Also, Figure 3(A) corresponds to the A-A cross section in Figure 3(B).

The recess 13b has a pot-shaped receiving member 16. The receiving member 16 is made of metal, for example, and has an opening 16a that is long in the tunnel axis direction (i.e., a shape that is shorter in the tunnel circumferential direction than the length in the tunnel axis direction), a curved surface portion 16b with 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 tunnel interior 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 the segment 13 (for example, the concave surface 13t that constitutes part of the inner surface 13a).

For the pot-shaped receiving member 16, whose main body 16c is cylindrical, the opening 16a on the inlet side is narrowed to an elongated 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 surface of the main body 16c.

In this embodiment, since segment 13 is an RC segment, receiving member 16 is embedded in the concrete that constitutes segment 13. If segment 13 were a steel segment, receiving member 16 would be exposed. Also, if segment 13 was a composite segment, receiving member 16 would be embedded in the concrete that constitutes the composite segment.

The configuration of recesses 11b and 12b is similar to that of recess 13b, so its description will be omitted.

As shown in FIG. 2(B), the connecting jig 2R (connecting jig 2) comprises an engaging member 20, a spacer member 30, and an attachment member 40. The schematic configurations of the engaging member 20, the spacer member 30, and the attachment member 40 are shown in FIG. 4 to FIG. 6. Here, FIG. 4(A) to (C) are a plan view, a front view, and a side view of the engaging member 20. FIG. 5(A) and (B) are a plan view and a front view of the spacer member 30. FIG. 6(A) to (C) are a plan view, a front view, and a side view of the attachment member 40.

The engagement member 20 is made of, for example, metal, and includes a male threaded portion 21 and an insertion portion 22 attached to one side of the male threaded portion 21. The insertion portion 22 is the portion of the engagement member 20 that is inserted into the receiving member 16 described above. The insertion portion 22 has a flat portion 22a and a neck portion 22b. The flat portion 22a has a cross-sectional shape that corresponds 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.

The spacer member 30 is made of, for example, metal, and has a circular plate-shaped portion 31, a pair of protrusions 32 standing on one side of the plate-shaped portion 31, and a through hole 33 formed through the center of the plate-shaped portion 31. The protrusions 32 of the spacer member 30 are arranged on both sides of the through hole 33 in a plan view. The protrusions 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 thread portion 21 of the engaging member 20 is inserted into the through hole 33.

The mounting member 40 is made of, for example, metal, and includes a rectangular plate-shaped base 41 and a rectangular plate-shaped wall 42 erected from one surface of the base 41. A through hole 41a is formed through the base 41 for inserting the male threaded portion 21 of the engagement member 20. A through hole 42a is formed through the wall 42 for inserting the rod-shaped member 3. A reinforcing plate 43 is provided to reinforce the corner formed by the base 41 and the wall 42. The other surface of the base 41 may abut against the inner surface 13a of the segment 13.

Note that the connection jig 2F has the same configuration as the connection jig 2R, so its description will be omitted.

Next, the installation method of the connecting structure 1 in this embodiment will be described with reference to Figures 7 to 10. Here, Figures 7(a), 8(a), 9(a), 10(a) and (b) correspond to the above-mentioned Figure 3(a) (i.e., part P of Figure 2(a)). Also, Figures 7(b), 8(b) and 9(b) correspond to the above-mentioned Figure 3(b).

This installation of the linkage structure 1 is carried out prior to the release of the thrust jacks 80 shown in FIG.
7, the insertion portion 22 of the engagement member 20 is inserted into the body portion 16c of the receiving member 16 from the opening 16a side of the receiving member 16. During this insertion, the flat portion 22a of the insertion portion 22 of the engagement member 20 is oriented such that its flat cross section matches the elongated hole shape of the opening 16a of the receiving member 16.

Next, as shown in FIG. 8, the engaging member 20 is rotated 90° around the central axis of the male threaded 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), the flat portion 22a and the neck 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 in the tunnel circumferential direction, and therefore the movement of the engaging member 20 in the tunnel circumferential direction relative to the receiving member 16 is restricted. On the other hand, in the tunnel axial direction, as shown in FIG. 8(A), a gap is formed between the neck portion 22b of the engaging member 20 and the inner wall of the opening portion 16a of the receiving member 16, and therefore the engaging member 20 may wobble in the tunnel axial direction relative to the receiving member 16.

To prevent this wobble, as shown in FIG. 9, a spacer member 30 is attached to close the gap. At this time, the male threaded portion 21 of the engaging member 20 is inserted into the through hole 33 of the plate-shaped portion 31 of the spacer member 30, and the spacer member 30 is fixed by a nut 51 that screws onto the male threaded portion 21. By attaching the spacer member 30, the movement of the engaging member 20 relative to the receiving member 16 is restricted, mainly in the tunnel axis direction. Note that the shape of the opening 16a is not limited to an elongated hole, and the spacer member 30 may 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.

10(A), the male threaded portion 21 of the engaging member 20 is inserted into the through hole 41a of the base 41 of the mounting member 40, and a nut 52 that screws onto the male threaded portion 21 is tightened, thereby fixing the mounting member 40 to the engaging member 20. During this fixing, the orientation of the mounting member 40 can be adjusted so that the through hole 42a of the wall portion 42 of the mounting member 40 faces the tunnel axial direction.
In this manner, the connecting jig 2R is detachably attached to the inner surface 13a of the segment 13.

The method for removably attaching the connecting jig 2F to the inner surface 11a of the segment 11 is similar to the method for removably attaching the connecting jig 2R to the inner surface 13a of the segment 13, so the explanation will be omitted.

Prior to removably attaching the connecting jig 2F to the inner surface 11a of the segment 11, the connecting jig 2R may be removably attached to the inner surface 13a of the segment 13, or vice versa. In addition, the connecting jig 2F may be removably attached to the inner surface 11a of the segment 11 and the connecting jig 2R may be removably attached to the inner surface 13a of the segment 13 at the same time.

After the connecting jigs 2F, 2R are removably attached to the inner surfaces 11a, 13a of the segments 11, 13, as shown in Figure 10 (i), the male threaded portions 3a at both ends of the rod-shaped member 3 are inserted into the through holes 42a in the wall portions 42 of each mounting member 40 of the connecting jigs 2F, 2R, and the nuts 53 that screw into the male threaded portions 3a are tightened, thereby fixing the rod-shaped member 3 to the mounting member 40.
In this manner, the connection structure 1 is installed.

After installation of the connecting structure 1 is complete, the propulsion jacks 80 are released from the segments 11 .
The connecting structure 1 can be removed from the segments 11, 13 at any time after the assembly of at least the n rings is completed.

According to this embodiment, the tunnel lining segment connection structure 1 is a structure that connects a pair of segments 11, 13 arranged in the tunnel axis direction. The connection structure 1 includes connection jigs 2F, 2R that are detachably attached to the inner surface 11a, 13a of each segment 11, 13 on the tunnel interior side, and a rod-shaped member 3 that is provided to straddle the connection jigs 2F, 2R detachably attached to each segment 11, 13. Therefore, the segments 11, 13 arranged in the tunnel axis direction are connected by the rod-shaped member 3 via the connection jigs 2F, 2R. Therefore, when the driving jack 80 is released from the segment 11, it is possible to prevent the segment 11 from approaching the face side relative to the segments 12, 13 (in other words, the segment 11 from coming out from the n-1 ring to the face side). Therefore, it is possible to prevent the occurrence of gaps between the segment rings.

In addition, according to this embodiment, the connecting jigs 2F, 2R are removably fixed to the recesses 11b, 13b provided on the inner surfaces 11a, 13a of the segments 11, 13. By removably fixing the connecting jigs 2F, 2R to the recesses 11b, 13b provided as gripping holes for the gripping portion of the above-mentioned erector device, the gripping holes can be effectively utilized.

Furthermore, according to this embodiment, the recesses 11b, 13b include openings 16a that open to the inner surfaces 11a, 13a of the segments 11, 13. The connecting jigs 2F, 2R have an insertion portion 22 that is inserted into the recesses 11b, 13b (into the main body portion 16c) from the opening 16a side. The connecting jigs 2F, 2R have a spacer member 30 that closes the gap between the insertion portion 22 and the inner wall of the opening 16a. This spacer member 30 can limit the movement of the insertion portion 22 relative to the opening 16a.

In addition, according to this embodiment, the opening 16a has a long hole shape that is long in the tunnel axis direction. The movement of the insertion portion 22 in the tunnel axis direction relative to the opening 16a of this shape can be restricted by the spacer member 30.

Next, a second embodiment of the present invention will be described with reference to FIG.
Fig. 11 shows a schematic configuration of the connection structure 1 in this embodiment. In detail, Fig. 11(a) is a side view of a 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).
The points that differ from the first embodiment will be described.

The recess 13b provided on the inner surface 13a of the segment 13 has a cylindrical receiving member 17 with a female thread portion 17a on the inner space side of the tunnel. The receiving member 17 is made of, for example, metal or resin, and extends from the inner surface 13a of the segment 13 to the outer surface 13c. The opening of the receiving member 17 on the inner space side of the tunnel opens to the inner surface 13a of the segment 13 (for example, the concave surface 13t that constitutes part of the inner surface 13a).

The recess 13b having the receiving member 17 can function as a gripping hole for the gripping part of the erector device described above. In addition to this, 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 excavated ground by the shield tunneling machine and the lining body 10.

The recesses 11b, 12b provided on the inner surfaces 11a, 12a of the segments 11, 12 are configured similarly to the recess 13b (having a receiving member 17) provided on the inner surface 13a of the segment 13.

The connecting jig 2R includes a base 60 that is removably attached to the inner surface 13a of the segment 13, and a swivel part 70 that is attached to the base 60 and can rotate relative to the base 60.

The base 60 has a disk-shaped handle cover 61, multiple handles 62 (four in FIG. 11) standing on one side of the handle cover 61, a rotating part attachment part 63 standing on the center of one side of the handle cover 61 and having a male thread part 63a on the tip side, and an engagement part 64 standing on the center of the other side of the handle cover 61 and having a male thread part 64a on the tip side.

The male threaded portion 64a of the engagement portion 64 of the base 60 screws into the female threaded portion 17a of the receiving member 17 of the recess 13b. The handle cover 61 of the base 60 is configured to cover the recessed surface 13t, and a seal member 65, such as a rubber packing, is interposed between the outer peripheral edge of the other surface of the handle cover 61 and the inner surface 13a of the segment 13.

The swivel section 70 comprises a rectangular plate-shaped bottom section 71, a pair of wall sections 72 standing on one side of the bottom section 71 and facing each other with a gap between them, and a pair of plate members 73 for reinforcing the wall sections 72. Here, in FIG. 11(A), the plate members 73 are omitted from the illustration in order to simplify the illustration.

A through hole 71a is formed in the center of the bottom 71, into which the base end side of the swivel attachment part 63 fits loosely. A through hole 72a is formed in the wall part 72, through which the rod-shaped member 3 is inserted.

With the base end of the swivel attachment part 63 loosely fitted into the through hole 71a of the bottom 71 of the swivel part 70, a nut 75 that screws into the male threaded part 63a of the swivel attachment part 63 is attached together with a washer 76, so that the swivel part 70 is attached to the base 60 in a state in which it can rotate around the central axis of the swivel attachment part 63.

In this embodiment, since segment 13 is an RC segment, receiving member 17 is embedded in the concrete that constitutes segment 13. If segment 13 were a steel segment, receiving member 17 would be exposed. Also, if segment 13 was a composite segment, receiving member 17 would be embedded in the concrete that constitutes the composite segment.

The connecting jig 2F, which is detachably attached to the inner surface 11a of the segment 11, has the same configuration as the connecting jig 2R (which has a base portion 60 and a rotating portion 70), so its description is omitted.

In particular, according to this embodiment, the recesses 11b, 13b provided on the inner surfaces 11a, 13a of the segments 11, 13 have female threads 17a. The connecting jigs 2F, 2R have male threads 64a that screw into the female threads 17a. This allows the connecting jigs 2F, 2R to be detachably fixed to the recesses 11b, 13b with a simple configuration.

Furthermore, according to this embodiment, the connecting jigs 2F, 2R include a base 60 that is detachably attached to the inner surfaces 11a, 13a of the segments 11, 13, and a swivel part 70 that is attached to the base 60 so as to be rotatable relative to the base 60. The end of the rod-shaped member 3 is detachably fixed to the swivel part 70 (see FIG. 11 (A)). Therefore, the swivel part 70 can be appropriately swiveled relative to the base 60 so that the rod-shaped member 3 can be smoothly attached to the swivel part 70.

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

In addition, in each of the above-described embodiments, both of the connecting jigs 2F and 2R are removably attached to the key segments, but at least one of the connecting jigs 2F and 2R may be removably attached to a segment other than the key segment.

In addition, in each of the above-mentioned embodiments, when the driving jacks 80 are released from the segments 11 during assembly of the n-ring, an example has been described in which the connecting structure 1 is installed prior to the release, but the case in which the connecting structure 1 is installed is not limited to this. For example, when all the driving jacks 80 are released from the existing segments behind them when the shield tunneling machine reaches the arrival shaft, multiple connecting structures 1 may be installed at intervals from each other in the tunnel circumferential direction so that multiple connecting jigs 2F are attached to the segment ring located at the forefront prior to the release. This makes it possible to prevent gaps from occurring between the segment rings when all the driving jacks 80 are released from the segment ring located at the forefront.

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 encompasses various improvements and modifications made by those skilled in the art within the scope of the claims, in addition to those directly shown in the described embodiments.
The claims as originally filed were as follows:
[Claim 1]
A structure that connects a pair of segments arranged in the tunnel axial direction,
A connecting jig that is detachably attached to the inner surface of each segment on the tunnel interior side;
A rod-shaped member provided so as to straddle the connecting jigs that are detachably attached to each segment;
A segment connection structure for tunnel lining comprising:
[Claim 2]
2. The tunnel lining segment connection structure according to claim 1, wherein the connecting jig is detachably fixed to a recess provided on the inner surface of the segment.
[Claim 3]
the recess includes an opening that opens to the inner surface of the segment,
the connecting jig has an insertion portion that is inserted into the recess from the opening side,
3. The tunnel lining segment connection structure according to claim 2, wherein the connection jig further comprises a spacer member that closes a gap between the insertion portion and an inner wall of the opening.
[Claim 4]
4. The tunnel lining segment connection structure according to claim 3, wherein the opening has an elongated hole shape that is long in the tunnel axial direction.
[Claim 5]
The recess has a female thread,
3. The tunnel lining segment connection structure according to claim 2, wherein the connecting jig has a male threaded portion that screws into the female threaded portion.
[Claim 6]
The connecting jig includes a base portion that is detachably attached to the inner surface of the segment, and a rotating portion that is attached to the base portion so as to be rotatable relative to the base portion,
A tunnel lining segment connection structure as described in any one of claims 1 to 5, wherein an end of the rod-shaped member is removably fixed to the rotating portion.

1...connecting structure, 2, 2F, 2R...connecting jig, 3...rod-shaped member, 3a...male threaded portion, 10...covering body, 11, 12, 13...segment, 11a, 12a, 13a...inner surface, 11b, 12b, 13b...recess, 11c, 12c, 13c...outer surface, 16...receiving member, 16a...opening, 16b...curved surface portion, 16c...main body, 16d...bottom, 17...receiving member, 17a...female threaded portion, 20...engaging member, 21...male threaded portion, 22...insertion portion, 22a...flat portion, 22b...neck portion, 22c...curved surface, 30...spacer Member, 31...plate-shaped portion, 32...projection portion, 33...through hole, 40...mounting member, 41...base portion, 41a...through hole, 42...wall portion, 42a...through hole, 43...reinforcing plate, 51-53...nut, 60...base portion, 61...handle cover, 62...handle, 63...rotation portion mounting portion, 63a...male thread portion, 64...engagement portion, 64a...male thread portion, 65...sealing member, 70...rotation portion, 71...bottom portion, 71a...through hole, 72...wall portion, 72a...through hole, 73...plate member, 75...nut, 76...washer, 80...propulsion jack

Claims (3)

A structure that connects a pair of segments arranged in the tunnel axial direction,
A connecting jig that is detachably attached to a recess provided on the inner surface of each segment on the tunnel interior side;
A rod-shaped member provided so as to straddle the connecting jigs that are detachably attached to each segment;
Equipped with
The recess includes an opening that opens to the inner surface,
The opening has a long hole shape that is long in the tunnel axial direction,
the connecting jig has an insertion portion that is inserted into the recess from the opening side,
The connecting structure for segments for tunnel lining further includes a spacer member that fills the gap between the insertion portion and the inner wall of the opening, and the spacer member limits movement of the insertion portion relative to the opening in the tunnel axis direction. The segment connection structure for a tunnel lining according to claim 1 , wherein one or more segments are disposed between the pair of segments. A structure that connects a pair of segments arranged in the tunnel axial direction,
A connecting jig that is detachably attached to the inner surface of each segment on the tunnel interior side;
A rod-shaped member provided so as to straddle the connecting jigs that are detachably attached to each segment;
Equipped with
In a tunnel lining segment connection structure, one or more segments are disposed between the pair of segments,
The connecting jig includes a base portion detachably attached to the inner surface, and a rotating portion attached to the base portion so as to be rotatable relative to the base portion,
A connecting structure for segments for tunnel lining, in which the end of the rod-shaped member is removably fixed to the rotating portion.