Tunnel construction method

Abstract

To provide a joint structure between segments which can be cut with a cutter head of a shield machine.SOLUTION: A joint structure 20 jointing end parts of adjacent segments 10A, 10B by abutting to each other comprises: an insert member 21A buried in an end part of one segment 10A; an insert member 21B buried in an end part of the other segment 10B; joint means 22 (bolts 23A, 23B, and a plate-like member 24) jointing the insert members 21A, and 21B. Here, the insert members 21A, 21B are made of resin, preferably made of FRP, and more preferably made of GFRP or CFRP.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a joint structure of segments for tunnel lining and a tunnel construction method. [Background technology]

[0002] A shield tunnel, which is an example of a tunnel formed underground, is formed by a shield method. In the shield method, for example, while the ground is excavated with a shield machine, tunnel lining segments (hereinafter simply referred to as "segments") are assembled one after another in the tunnel circumferential direction at the rear of the shield machine to construct segment rings, and adjacent segment rings are connected in the tunnel axial direction to construct a cylindrical lining body. In other words, the above-mentioned lining body is constructed by connecting multiple segments in the tunnel circumferential direction and the tunnel axial direction. In this regard, Patent Document 1 discloses a joint structure for connecting adjacent segments.

[0003] The above-mentioned lining may have a portion that can be cut by the cutter head of a shield machine. Examples of this are disclosed in Patent Documents 2 and 3. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-336492 A [Patent Document 2] JP 2004-36177 A [Patent Document 3] JP 2005-61212 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, in order to cut the aforementioned cuttable portion with the cutter head of the shield tunneling machine, the segments were uniquely allocated so that the joint structure of the segments was not located within the cuttable portion (see Patent Documents 2 and 3). This is because the components of the joint structure of the segments (see Patent Document 1) are made of metal, and cutting these metal components with the cutter head of the shield tunneling machine would cause problems. Therefore, the aforementioned unique allocation of the segments required a lot of time and effort to assemble the segments.

[0006] In view of the above circumstances, an object of the present invention is to provide a segment joint structure that can be cut by the cutter head of a shield tunneling machine. [Means for solving the problem]

[0007] The tunnel construction method of the present invention includes assembling arc-shaped concrete segments in the circumferential direction of the tunnel to form segment rings, and connecting adjacent segment rings in the axial direction of the tunnel to form a cylindrical lining body. Continued The hand structure is a joint in which the ends of adjacent segments are butted together. It is something that A first insert member made of resin is embedded in an end portion of one segment, and a second insert member made of resin is embedded in an end portion of the other segment, and the first insert member and the second insert member are connected. Metal and a connecting means. The connecting means includes a first bolt, a second bolt, and a plate-like member. The first insert member has a female threaded portion into which the male threaded portion of the first bolt screws. The second insert member has a female threaded portion into which the male threaded portion of the second bolt screws. The plate-like member is arranged so as to straddle the ends of adjacent segments. A first insertion hole through which the male threaded portion of the first bolt is inserted and a second insertion hole through which the male threaded portion of the second bolt is inserted are formed through the plate-like member. Recesses are formed on the inner surfaces of adjacent segments so as to be continuous between the adjacent segments. , the bottom surface of the recess is a concrete surface The plate-like member, the head of the first bolt, and the head of the second bolt are housed in the recess. Thus, the plate-like member comes into contact with the bottom surface of the recess.

[0008] The tunnel construction method according to the present invention comprises the steps of: A group of segments that are part of the lining body, As mentioned above SuccessorThe method includes removing the connecting means from the segments that have been manually connected and assembled, and cutting the segments from which the connecting means have been removed with a cutter head of a shield tunneling machine. Effect of the Invention

[0009] According to the present invention, the first insert member constituting the joint structure of the segments and the second insert member Therefore, after removing the connecting means constituting the joint structure, the first insert member and the second insert member The remaining portion including the above can be cut by the cutter head of the shield tunneling machine. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a tunnel construction method according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a view showing a part of a tunnel lining in the first embodiment that can be cut by a cutter head of a shield machine, viewed from the side opposite to the natural ground. [Diagram 3] FIG. 1 is a diagram showing a joint structure of segments in the first embodiment; [Figure 4] FIG. 13 is a diagram showing a method of connecting segments in the first embodiment. [Diagram 5] FIG. 13 is a diagram showing a joint structure of a segment in a second embodiment of the present invention. [Figure 6] FIG. 13 is a diagram showing a joint structure of a segment in a third embodiment of the present invention. [Figure 7] FIG. 13 is a diagram showing a reinforcing means in a fourth embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing a first modified example of the fourth embodiment. [Figure 9] FIG. 13 shows a second modified example of the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0012] FIG. 1 shows a tunnel construction method according to a first embodiment of the present invention.

[0013] The existing tunnel 1 is a shield tunnel formed by the shield tunneling method. In the shield tunneling method, while the ground is excavated with a shield machine (not shown), arc-shaped segments are assembled one after another in the circumferential direction of the tunnel at the rear of the shield machine to form segment rings, and adjacent segment rings are connected in the axial direction of the tunnel to form a cylindrical lining. In this method, the shield machine pushes the existing segment ring behind it backward with a thrust jack, and the thrust generated as a reaction force moves the shield machine forward while excavating the ground.

[0014] In the tunnel construction method of this embodiment, first, support 2 including, for example, beams and columns is provided within tunnel 1 to reinforce the inside of tunnel 1. Then, a new tunnel is formed so as to overlap the side of tunnel 1. This new tunnel is formed using a shield machine 4 different from the above-mentioned shield machine. A plurality of cuttable arc-shaped segments 10 (see Figures 2 and 3) are arranged in a portion 5 of the lining of tunnel 1 that can be cut by a cutter head 4a of the shield machine 4.

[0015] Fig. 2 is a view of a portion 5 of the lining of tunnel 1 that can be cut by cutter head 4a of shield machine 4, viewed from the side opposite the natural ground. In the following description, the surface of segment 10 that constitutes the inner surface (inner wall surface) of the lining of tunnel 1 will be referred to as the "inner surface," while the surface that corresponds to the outer surface (natural ground surface) of the lining of tunnel 1 will be referred to as the "outer surface." Thus, Fig. 2 shows the inner surface 11 of segment 10.

[0016] The segment 10 is configured so as to be cuttable by the cutter head 4a of the shield machine 4. The segment 10 is, for example, a concrete segment containing non-metallic reinforcing fibers such as glass fiber or carbon fiber instead of reinforcing bars.

[0017] In plan view, the segment 10 has a rectangular shape with its long sides in the tunnel circumferential direction and its short sides in the tunnel axial direction. In this embodiment, a plurality of (eight in FIG. 2 ) recesses 12 are formed at intervals from one another on the peripheral edge of the inner surface 11 of the segment 10. These recesses 12 are formed at both ends of the segment 10 in the tunnel axial direction and at both ends of the segment 10 in the tunnel circumferential direction. The recesses 12 are formed so as to be continuous between adjacent segments 10.

[0018] Fig. 3 is a diagram showing a joint structure 20 of the segment 10 in this embodiment. Here, Fig. 3 shows the joint structure 20 in which the ends of the segments 10 adjacent to each other in the tunnel circumferential direction are butted together to be joined, but it goes without saying that a similar joint structure can also be applied to the case in which the ends of the segments 10 adjacent to each other in the tunnel axial direction are butted together to be joined.

[0019] In the following, for ease of explanation, of the segments 10 adjacent to each other in the circumferential direction of the tunnel, the reference numerals of components related to one segment 10 are suffixed with "A," and the reference numerals of components related to the other segment 10 are suffixed with "B." Therefore, one segment 10 is referred to as "10A," and the other segment 10 is referred to as "10B."

[0020] The joint structure 20 includes cylindrical insert members 21A, 21B and a connecting means 22. The connecting means 22 includes bolts 23A, 23B and a plate-like member 24. Here, the insert member 21A corresponds to the "first insert member" of the present invention, and the insert member 21B corresponds to the "second insert member" of the present invention. In addition, the bolt 23A corresponds to the "first bolt" of the present invention, and the bolt 23B corresponds to the "second bolt" of the present invention.

[0021] The insert member 21A is embedded in the recess 12A of the segment 10A. The insert member 21A is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP).

[0022] The insert member 21A is cylindrical with a bottom. A female thread portion into which a male thread portion of a bolt 23A is screwed is formed on one end side (open end side) of the insert member 21A. The bolt 23A is made of, for example, metal. The open end of the insert member 21A (the open end of the female thread portion) is exposed at the bottom surface of the recess 12A of the segment 10A.

[0023] The insert member 21B is embedded in the recess 12B of the segment 10B. The insert member 21B is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP).

[0024] The insert member 21B is cylindrical with a bottom. A female thread portion into which the male thread portion of the bolt 23B is screwed is formed on one end side (open end side) of the insert member 21B. The bolt 23B is made of, for example, metal. The open end of the insert member 21B (the open end of the female thread portion) is exposed at the bottom surface of the recess 12B of the segment 10B.

[0025] The plate-like member 24 is made of, for example, metal and has a rectangular flat plate shape. The plate-like member 24 is accommodated in the recesses 12A, 12B so as to straddle the recesses 12A, 12B of the adjacent segments 10A, 10B.

[0026] Through holes 25A, 25B are formed through plate-like member 24 on one side and the other side in the long side direction, respectively. An external thread portion of bolt 23A is inserted into one through hole 25A, and an external thread portion of bolt 23B is inserted into the other through hole 25B. Here, through hole 25A corresponds to a "first through hole" of the present invention, and through hole 25B corresponds to a "second through hole" of the present invention.

[0027] In this embodiment, the distance L between the central axes of each of the insertion holes 25A, 25B of the plate-shaped member 24 is set to match the distance between the central axes of the female threaded portions of the insert members 21A, 21B when the connection of the ends of the segments 10A, 10B is completed.

[0028] In this embodiment, the necks (portions between the heads and the male threads) of the bolts 23A and 23B are formed in a truncated cone shape. The necks are tapered so that the diameter decreases as the necks move away from the heads of the bolts 23A and 23B (in other words, as the necks approach the male threads). In addition, tapered surfaces 25AS and 25BS (see FIG. 4A) are formed in the insertion holes 25A and 25B of the plate-like member 24, respectively, so as to correspond to the tapered shapes of the necks of the bolts 23A and 23B.

[0029] Here, the connecting means 22 connects the end of the segment 10A to the insert member 21B via the insert member 21A. Also, the connecting means 22 connects the end of the segment 10B to the insert member 21A via the insert member 21B. Also, the connecting means 22 connects the insert member 21A to the insert member 21B.

[0030] Next, a method of butting and joining the ends of the segments 10A, 10B using the above-mentioned joint structure 20 will be described with reference to FIG. FIG. 4 shows how the segments 10A and 10B are connected.

[0031] In this connection method, first, as shown in Fig. 4(A), an end face (joint face) 10AS of the segment 10A is brought close to an end face (joint face) 10BS of the segment 10B so that they face each other. Although not shown, a sealant is inserted in the gap C between the end face 10AS of the segment 10A and the end face 10BS of the segment 10B.

[0032] 4(A), the plate-shaped member 24 is brought into contact with the bottom surfaces of the recesses 12A, 12B of the segments 10A, 10B with the tapered surfaces 25AS, 25BS of the insertion holes 25A, 25B of the plate-shaped member 24 facing the inside of the tunnel 1. Then, the male threads of the bolts 23A, 23B are inserted into the insertion holes 25A, 25B of the plate-shaped member 24 and further screwed into the female threads of the insert members 21A, 21B. Here, the inner diameters of the insertion holes 25A, 25B of the plate-shaped member 24 are formed slightly larger than the outer diameters of the male threads of the bolts 23A, 23B, and this slightly larger amount can function as a play to allow the above-mentioned gap C.

[0033] Then, when the bolts 23A, 23B are gradually tightened, the tapered necks of the bolts 23A, 23B are guided by the tapered surfaces 25AS, 25BS of the insertion holes 25A, 25B of the plate-like member 24, and as a result, the gap C between the segments 10A, 10B gradually narrows. At this time, the sealing member described above is pressed so as to be crushed. In this manner, segments 10A and 10B are connected.

[0034] Incidentally, the method of tightening the bolts 23A, 23B may be such that one of them is tightened first and the other is tightened later, or both may be tightened in parallel (for example, intermittently and alternately). In other words, the method of tightening the bolts 23A, 23B is arbitrary.

[0035] In this embodiment, the aforementioned portion 5 of the lining of the tunnel 1 is composed of a group of segments (a group consisting of a plurality of segments 10) that are connected and assembled by joint structures 20 of the aforementioned segments 10.

[0036] The tunnel construction method in this embodiment includes removing the connecting means 22 (bolts 23A, 23B and plate-shaped member 24) from the portion 5 which has been assembled by connecting the aforementioned segments 10 with the joint structure 20, and cutting the portion 5 from which the connecting means 22 (bolts 23A, 23B and plate-shaped member 24) has been removed with the cutter head 4a of the shield tunneling machine 4 (see Figure 1).

[0037] Here, in this embodiment, since the connecting means 22 is composed of the bolts 23A, 23B and the plate-like member 24, the connecting means 22 can be easily removed from within the tunnel 1.

[0038] According to this embodiment, the joint structure 20 is a joint structure in which the ends of adjacent segments 10 are butted against each other. The joint structure 20 includes an insert member 21A (first insert member) embedded in the end of one segment 10A, and a connecting means 22 that connects the end of the other segment 10B and the insert member 21A. Here, the insert member 21A is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, after removing the connecting means 22 that constitutes the joint structure 20, the remaining part of the joint structure 20 (at least the insert member 21A) can be cut by the cutter head 4a of the shield machine 4. In addition, since the insert member 21A is not made of iron, it has an anti-rust effect.

[0039] According to this embodiment, the joint structure 20 further includes an insert member 21B (second insert member) embedded in the end of the other segment 10B. The connecting means 22 connects the insert member 21A and the insert member 21B. Here, the insert member 21B is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, after removing the connecting means 22 constituting the joint structure 20, the remaining part (insert members 21A, 21B) of the joint structure 20 can be cut by the cutter head 4a of the shield machine 4. In addition, since the insert member 21B is not made of iron, it has an anti-rust effect.

[0040] According to this embodiment, the connecting means 22 includes a bolt 23A (first bolt) and a bolt 23B (second bolt). The insert member 21A has a female threaded portion into which the male threaded portion of the bolt 23A screws. The insert member 21B has a female threaded portion into which the male threaded portion of the bolt 23B screws. Therefore, commercially available bolts can be used as the bolts 23A and 23B that constitute the connecting means 22.

[0041] According to this embodiment, the connecting means 22 further includes a plate-like member 24 arranged to straddle the ends of the adjacent segments 10A, 10B. The plate-like member 24 is formed with an insertion hole 25A (first insertion hole) through which the male thread portion of the bolt 23A is inserted and an insertion hole 25B (second insertion hole) through which the male thread portion of the bolt 23B is inserted. Therefore, the connecting means 22 can be simply configured.

[0042] According to this embodiment, the segments 10 are configured to be cuttable by the cutter head 4a of the shield machine 4, and are made of, for example, concrete. The segments 10 are preferably made of concrete containing non-metallic reinforcing fibers such as glass fibers or carbon fibers.

[0043] According to this embodiment, the tunnel construction method includes removing the connecting means 22 from the segment group (the aforementioned portion 5 in the lining of the tunnel 1) assembled by connecting the segments 10 with the joint structures 20, and cutting the segment group (the aforementioned portion 5 in the lining of the tunnel 1) from which the connecting means 22 has been removed, with the cutter head 4a of the shield machine 4. Therefore, the allocation of the segments in the aforementioned portion 5 in the lining of the tunnel 1 can be performed in the same manner as the allocation of the segments in the portions other than the aforementioned portion 5, and therefore there is no need to perform a unique allocation of the segments as in the aforementioned Patent Documents 2 and 3, and thus the tunnel construction efficiency can be improved.

[0044] Next, a second embodiment of the present invention will be described with reference to FIG.

[0045] Fig. 5 is a diagram showing a joint structure 20' of the segments 10 in this embodiment. Here, Fig. 5 shows a joint structure 20' in which the ends of the segments 10 adjacent to each other in the tunnel circumferential direction are butted together to be joined, but it goes without saying that a similar joint structure can also be applied to the case in which the ends of the segments 10 adjacent to each other in the tunnel axial direction are butted together to be joined.

[0046] In this embodiment, as in the first embodiment described above, for convenience of explanation, among the segments 10 adjacent to each other in the tunnel circumferential direction, the reference numerals of components related to one segment 10 are suffixed with "A" and the reference numerals of components related to the other segment 10 are suffixed with "B". Therefore, one segment 10 is referred to as "10A" and the other segment 10 is referred to as "10B". The points that differ from the first embodiment will be described.

[0047] In this embodiment, a bolt box 15 is formed on an inner surface 11B of the segment 10B. Here, the bolt box 15 is a recess formed on the inner surface 11B of the segment 10B.

[0048] An insertion hole 16 through which the rod-shaped member 31 is inserted is formed at the end of the segment 10B in the tunnel circumferential direction. One end of the insertion hole 16 opens at the inner wall surface 15a of the bolt box 15, and the other end opens at the end face 10BS of the segment 10B in the tunnel circumferential direction. The insertion hole 16 extends linearly from one end to the other end (in other words, the further away from the bolt box 15 it is), so as to approach the outer surface of the segment 10B. The insertion hole 16 extends at an angle with respect to the end face 10BS of the segment 10B.

[0049] In this embodiment, the open end 21AT of the female thread portion of the insert member 21A embedded in the segment 10A is exposed on the end face 10AS side of the segment 10A (the joint surface side with the segment 10B). At least a part of the end face 21ATS of the insert member 21A on the side where the open end 21AT of the female thread portion is located may be covered with concrete constituting the segment 10A. In other words, the end face 21ATS of the insert member 21A may be disposed on the inner side of the segment 10A relative to the end face 10AS of the segment 10A, and the insert member 21A may be embedded on the inner side of the segment 10A relative to the end face 10AS of the segment 10A so that at least a part of the end face 21ATS is covered with concrete or the like.

[0050] In this embodiment, when the connection between the ends of the segments 10A and 10B is completed, the through hole 16 of the segment 10B and the female thread of the insert member 21A are arranged so as to communicate with each other, specifically, so as to be aligned on the same axis. The opening end 16a of the through hole 16 and the opening end 21AT of the female thread of the insert member 21A may face each other at the joint surfaces (end faces 10AS and 10BS) of the segments 10A and 10B. It goes without saying that the through hole 16 of the segment 10B and the female thread of the insert member 21A can communicate with each other even if at least a part of the end face 21ATS of the insert member 21A is covered with concrete or the like as described above.

[0051] In this embodiment, the joint structure 20' is configured to include a connecting means 30, and the connecting means 30 is configured to include a rod-shaped member 31. The rod-shaped member 31 is made of, for example, metal, and has a male thread portion formed on at least one end thereof. In this embodiment, the rod-shaped member 31 has a head 32 at its base end, and the remaining portion (including the tip portion) forms a male thread portion. That is, in this embodiment, the rod-shaped member 31 has a male thread portion formed on one end (tip portion) thereof. The rod-shaped member 31 can function as a so-called through bolt.

[0052] In this embodiment, the male threaded portion of the rod-shaped member 31 is inserted into the insertion hole 16 from within the bolt box 15 of the segment 10B, and is further screwed into the female threaded portion of the insert member 21A, thereby connecting the segments 10A and 10B. At this time, the head 32 of the rod-shaped member 31 is disposed within the bolt box 15 of the segment 10B. In addition, it is preferable that a washer 33 is interposed between the head 32 of the rod-shaped member 31 and the inner wall surface 15a of the bolt box 15.

[0053] In this embodiment, the rod-shaped member 31 constituting the connecting means 30 realizes the function of connecting the end of the segment 10B and the insert member 21A.

[0054] In this embodiment, the aforementioned portion 5 of the lining of the tunnel 1 is composed of a group of segments (a group consisting of a plurality of segments 10) that are assembled by connecting the aforementioned segments 10 with joint structures 20'.

[0055] The tunnel construction method in this embodiment includes removing the connecting means 30 (rod-shaped member 31) from the portion 5, which has been assembled by connecting the above-mentioned segments 10 with the joint structure 20', and cutting the portion 5 from which the connecting means 30 (rod-shaped member 31) has been removed with the cutter head 4a of the shield tunneling machine 4 (see Figure 1).

[0056] In this embodiment, since the connecting means 30 is composed of the rod-shaped member 31, the connecting means 30 can be easily removed from within the tunnel 1.

[0057] Particularly, according to this embodiment, the joint structure 20' is a joint in which the ends of adjacent segments 10 are butted against each other. The joint structure 20' includes an insert member 21A (first insert member) embedded in the end of one segment 10A, and a connecting means 30 that connects the end of the other segment 10B to the insert member 21A. Here, the insert member 21A is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, after removing the connecting means 30 that constitutes the joint structure 20', the remaining part of the joint structure 20' (at least the insert member 21A) can be cut by the cutter head 4a of the shield machine 4.

[0058] According to this embodiment, the connecting means 30 includes a rod-shaped member 31 having a male thread portion at least at one end. An insertion hole 16 through which the rod-shaped member 31 is inserted is formed at the end of the other segment 10B. The insert member 21A has a female thread portion into which the male thread portion of the rod-shaped member 31 is screwed. The opening end 16a of the insertion hole 16 and the opening end 21AT of the female thread portion of the insert member 21A face each other and communicate with each other. The opening end 16a of the insertion hole 16 and the opening end 21AT of the female thread portion of the insert member 21A may face each other at the joint surfaces (end surfaces 10AS, 10BS) of the adjacent segments 10A, 10B. This allows the joint structure 20' to be configured simply.

[0059] According to this embodiment, the tunnel construction method includes removing the connecting means 30 from the segment group (the aforementioned portion 5 in the lining of the tunnel 1) assembled by connecting the segments 10 with the joint structures 20', and cutting the segment group (the aforementioned portion 5 in the lining of the tunnel 1) from which the connecting means 30 has been removed with the cutter head 4a of the shield machine 4. Therefore, the allocation of the segments in the aforementioned portion 5 in the lining of the tunnel 1 can be performed in the same manner as the allocation of the segments in the portions other than the aforementioned portion 5, and therefore there is no need to perform a unique allocation of the segments as in the aforementioned Patent Documents 2 and 3, and thus the tunnel construction efficiency can be improved.

[0060] Next, a third embodiment of the present invention will be described with reference to FIG.

[0061] FIG. 6 is a diagram showing a joint structure 20" of a segment 10 in this embodiment. Here, FIG. 6 shows a joint structure 20" in which the ends of adjacent segments 10 in the tunnel axial direction are butt-joined, but it goes without saying that a similar joint structure can also be applied to the case in which the ends of adjacent segments 10 in the tunnel circumferential direction are butt-joined.

[0062] In this embodiment, for convenience of explanation, of the segments 10 adjacent to each other in the tunnel axis direction, the reference numerals of components related to one segment 10 are suffixed with "A" and the reference numerals of components related to the other segment 10 are suffixed with "B." Therefore, one segment 10 is referred to as "10A" and the other segment 10 is referred to as "10B." The points that differ from the above-described second embodiment will be described.

[0063] In this embodiment, bolt boxes 15A and 15B are formed on inner surfaces 11A and 11B of segments 10A and 10B, respectively. Here, bolt boxes 15A and 15B are recesses formed on inner surfaces 11A and 11B of segments 10A and 10B.

[0064] The joint structure 20" includes sheath pipes 40A and 40B, a rod-shaped member 41, and a nut .

[0065] A plurality of sheath pipes 40A are embedded in the end portion of the segment 10A in the tunnel axis direction. A plurality of sheath pipes 40B are embedded in the end portion of the segment 10B in the tunnel axis direction. The sheath pipes 40A and 40B are made of, for example, resin (synthetic resin), and are preferably made of polyvinyl chloride resin.

[0066] One end of the sheath pipe 40A opens at the inner wall surface 15Aa of the bolt box 15A of the segment 10A, curves in an arc midway, and the other end opens at the end face 10AS of the tunnel axis direction of the segment 10A. One end of the sheath pipe 40B opens at the inner wall surface 15Ba of the bolt box 15B of the segment 10B, curves in an arc midway, and the other end opens at the end face 10BS of the tunnel axis direction of the segment 10B. The sheath pipes 40A and 40B are connected to each other at the end face 10AS of the segment 10A and the end face 10BS of the segment 10B.

[0067] The rod-shaped member 41 is made of metal, for example, and is a so-called bent bolt. The rod-shaped member 41 has a male thread portion at least on one end thereof. In this embodiment, the rod-shaped member 41 has a head 43 on its base end, and the remaining portion (including the tip portion) forms a male thread portion. That is, in this embodiment, the rod-shaped member 41 has a male thread portion formed on one end (tip portion). The rod-shaped member 41 can function as a so-called through bolt. The male thread portion of the rod-shaped member 41 is curved in an arc shape. The male thread portion of the rod-shaped member 41 is inserted into the sheath tubes 40A, 40B so as to straddle these sheath tubes 40A, 40B.

[0068] In this embodiment, the head 43 of the rod-shaped member 41 is disposed in the bolt box 15B of the segment 10B. Meanwhile, a nut 42 is disposed in the bolt box 15A of the segment 10A. This nut 42 is made of metal, for example, and has a female thread portion that screws into the male thread portion of the rod-shaped member 41. Note that, although a countersunk nut is used as the nut 42 in this embodiment, the nut 42 is not limited to this. Also, it is preferable that a washer 44 is interposed between the head 43 of the rod-shaped member 41 and the inner wall surface 15Ba of the bolt box 15B.

[0069] In this embodiment, a plurality of rod-shaped horizontal reinforcing members 55 and vertical reinforcing members 56 are provided as reinforcing means for reinforcing the ends of the segments 10A, 10B (where the joint structure 20" is arranged). These horizontal reinforcing members 55 and vertical reinforcing members 56 are substitutes for the horizontal reinforcing steel bars and vertical reinforcing steel bars used in conventional RC segments, and are formed from non-metallic reinforced fiber reinforcement materials such as carbon fiber reinforcement and glass fiber reinforcement. Therefore, the horizontal reinforcing members 55 and vertical reinforcing members 56 can be cut by the cutter head 4a of the shield tunneling machine 4. In addition, since the horizontal reinforcing members 55 and vertical reinforcing members 56 are not made of iron, they have an anti-rust effect.

[0070] In this embodiment, the aforementioned portion 5 of the lining of the tunnel 1 is composed of a group of segments (a group consisting of a plurality of segments 10) that are connected and assembled by joint structures 20'' of the aforementioned segments 10.

[0071] The tunnel construction method in this embodiment includes removing the rod-shaped members 41 and nuts 42 from the portion 5, which has been assembled by connecting the above-mentioned segments 10 with the joint structure 20", and cutting the portion 5 from which the rod-shaped members 41 and nuts 42 have been removed, with the cutter head 4a of the shield machine 4 (see Figure 1).

[0072] In this embodiment, a gap (slit 58) for cutting the rod-shaped member 41 is formed between the end faces (joint surfaces) 10AS, 10BS of the segments 10A, 10B. Therefore, even if it is difficult to pull out the rod-shaped member 41, which is a curved bolt, when removing it, a cutting device such as an electric saw can be inserted into the slit 58 to cut the rod-shaped member 41 at its center, so that the rod-shaped member 41 can be easily removed.

[0073] Particularly, according to this embodiment, the joint structure 20" butts and joins the ends of adjacent segments 10A, 10B. The joint structure 20" includes a rod-shaped member 41 inserted so as to straddle the sheath pipes 40A, 40B embedded in the ends of the segments 10A, 10B, respectively, and a nut 42 having a female threaded portion that screws into a male threaded portion formed on at least one end of the rod-shaped member 41. Here, the sheath pipes 40A, 40B are made of resin (synthetic resin). Therefore, after removing the rod-shaped member 41 and the nut 42 that constitute the joint structure 20", the remaining part of the joint structure 20" (the sheath pipes 40A, 40B) can be cut by the cutter head 4a of the shield machine 4. In addition, since the sheath pipes 40A, 40B are not made of iron, there is an anti-rust effect.

[0074] Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 shows the reinforcing means 60 in this embodiment. The points that differ from the above-described third embodiment will be described.

[0075] In this embodiment, a reinforcing means 60 is provided instead of the reinforcing means in the third embodiment. The reinforcing means 60 can be embedded in at least one of the segments 10A and 10B. In this embodiment, the reinforcing means 60 is embedded in both the segments 10A and 10B. In this regard, although FIG. 7 shows only the configuration related to the segment 10A, it goes without saying that the same configuration is also applied to the segment 10B.

[0076] The reinforcing means 60 includes one or more (three in FIG. 7) annular members 61a to 61c, a lattice member 62, and a reinforcing bar unit 63.

[0077] The reinforcing bar unit 63 is composed of a number of rod-shaped reinforcing bars 64 each extending in any one of the tunnel axial direction, circumferential direction, and radial direction, and is assembled into a cage shape. The reinforcing bars 64 constituting the reinforcing bar unit 63 are substitutes for the reinforcing steel bars used in conventional RC segments, and are formed of nonmetallic reinforced fiber reinforcing materials such as carbon fiber reinforcement and glass fiber reinforcement. Therefore, the reinforcing bar unit 63 can be cut by the cutter head 4a of the shield tunneling machine 4. In addition, since the reinforcing bar unit 63 is not made of iron, it has an anti-rust effect.

[0078] The lattice members (lattice bars) 62 are embedded in both the end of the segment 10A and the end of the segment 10B. The lattice members 62 are a replacement for the conventional rebar lattice (bar mesh) and are made of resin (synthetic resin), preferably fiber reinforced plastic (FRP), and more preferably glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the lattice members 62 can be cut by the cutter head 4a of the shield tunneling machine 4. In addition, since the lattice members 62 are not made of iron, they have an anti-rust effect. Note that Nefmac (registered trademark) can be used as the lattice members 62.

[0079] The annular members (hoops) 61a to 61c are embedded in both the end of the segment 10A and the end of the segment 10B. The annular members 61a to 61c may be, for example, a circular shape, an elliptical shape, or a rounded polygonal shape (for example, a rounded rectangular shape). In this embodiment, the annular members 61a to 61c are closed annular shapes, but they may also be open annular shapes (in other words, annular shapes with a part cut in the circumferential direction). The sheath tube 40A extends so as to penetrate the annular members 61a to 61c. In the example shown in FIG. 7, the annular members 61a to 61c are arranged at intervals from each other in the extension direction of the sheath tube 40A. Although not shown, the annular members 61a to 61c may be similarly arranged in the sheath tube 40B. The annular members 61a-61c are made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular members 61a-61c can be cut by the cutter head 4a of the shield machine 4. In addition, since the annular members 61a-61c are not made of iron, they have an anti-rust effect.

[0080] FIG. 8 shows a first modified example of this embodiment. FIG. 8 shows a case where the reinforcing means 60 is applied to the joint structure 20 in the first embodiment described above, and for the sake of simplicity, only the annular members (hoops) 61d, 61e are shown among the components of the reinforcing means 60. In other words, the reinforcing means 60 includes a lattice member 62 and a reinforcing unit 63, which are not shown, as its components. The annular members 61d, 61e may be, for example, a circular shape, an elliptical shape, or a polygonal shape with rounded corners (for example, a rectangular shape with rounded corners). The annular members 61d, 61e are closed annular shapes in this modification, but may also be open annular shapes (in other words, annular shapes with a part cut in the circumferential direction).

[0081] In this modified example, insert member 21A, which corresponds to the "first insert member" of the present invention, extends so as to penetrate one or more (one in FIG. 8) annular members 61d, which correspond to the "first annular member" of the present invention. The annular members 61d are embedded in the end of segment 10A. Insert member 21B, which corresponds to the "second insert member" of the present invention, extends so as to penetrate one or more (one in FIG. 8) annular members 61e, which correspond to the "second annular member" of the present invention. The annular members 61e are embedded in the end of segment 10B.

[0082] The annular members 61d, 61e are made of resin (synthetic resin), preferably fiber reinforced plastic (FRP), and more preferably glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular members 61d, 61e can be cut by the cutter head 4a of the shield machine 4. In addition, since the annular members 61d, 61e are not made of iron, they have an anti-rust effect.

[0083] FIG. 9 shows a second modification of this embodiment. FIG. 9 shows a case where the reinforcing means 60 is applied to the joint structure 20' in the second embodiment shown in FIG. 5, and for the sake of simplicity, only the annular members (hoops) 61f, 61g are shown among the components of the reinforcing means 60. In other words, the reinforcing means 60 includes a lattice member 62 and a reinforcing unit 63, which are not shown, as its components. The annular members 61f, 61g may be, for example, a circular shape, an elliptical shape, or a rounded polygonal shape (for example, a rounded rectangular shape). The annular members 61f, 61g are closed annular shapes in this modification, but may also be open annular shapes (in other words, annular shapes with a part cut in the circumferential direction). In addition, in FIG. 9, for the sake of simplicity, only the connecting means 30 (rod-shaped member 31 having a head 32) and the washer 33 are shown among the components of the joint structure 20'.

[0084] In this modification, the insert member 21A (see FIG. 5) corresponding to the "first insert member" of the present invention extends so as to penetrate one or more (one in FIG. 9) annular members 61f corresponding to the "first annular member" of the present invention. The annular member 61f is embedded in the end of the segment 10A. The insertion hole 16 (see FIG. 5) extends so as to penetrate one or more (one in FIG. 9) annular members 61g corresponding to the "third annular member" of the present invention. The annular member 61g is embedded in the end of the segment 10B. Here, the rod-shaped member 31 constituting the connecting means 30 (through bolt) extends so as to penetrate the annular members 61f, 61g.

[0085] The annular members 61f, 61g are made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular members 61f, 61g can be cut by the cutter head 4a of the shield machine 4. In addition, since the annular members 61a to 61c are not made of iron, they have an anti-rust effect.

[0086] Particularly, according to the first and second modified examples of this embodiment, the joint structure 20, 20' further includes annular members 61d, 61f (first annular members) embedded in the end of one of the segments 10A. The insert member 21A (first insert member) extends so as to penetrate the annular members 61d, 61f. Here, the annular members 61d, 61f are made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular members 61d, 61f can reinforce the periphery of the insert member 21A.

[0087] According to the first modification of this embodiment, the joint structure 20 further includes an annular member 61e (second annular member) embedded in the end of the other segment 10B. The insert member 21B (second insert member) extends so as to penetrate through the annular member 61e. Here, the annular member 61e is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular member 61e can reinforce the periphery of the insert member 21B.

[0088] According to the second modification of this embodiment, the joint structure 20' further includes an annular member 61g (third annular member) embedded in the end of the other segment 10B. The insertion hole 16 extends through the annular member 61g. Here, the annular member 61g is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the annular member 61g can reinforce the periphery of the insertion hole 16.

[0089] Furthermore, according to this embodiment (including the first and second modifications), the joint structure 20, 20', 20" further includes a lattice member 62 embedded in at least one of the end of one segment 10A and the end of the other segment 10B. Here, the lattice member 62 is made of resin (synthetic resin), preferably made of fiber reinforced plastic (FRP), and more preferably made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Therefore, the ends of the segments 10A, 10B can be reinforced by the lattice member 62.

[0090] In the above-described first to fourth embodiments and their modifications, examples have been shown in which a new tunnel is formed so as to overlap the side of tunnel 1. However, in addition to this, or instead of this, the segment joint structures described in the above-described first to fourth embodiments and their modifications can also be applied when a new tunnel is formed so as to overlap the upper and / or lower part of tunnel 1.

[0091] The underground structure to which the joint structure of the segments described in the first to fourth embodiments and their modifications is applied is not limited to a tunnel. For example, the joint structure of the segments described in the first to fourth embodiments and their modifications can be applied as a joint structure of the segments constituting a shaft constructed underground.

[0092] As is apparent 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 joint structure in which the ends of adjacent segments are butt-joined, A first insert member embedded in an end portion of one of the segments; a connecting means for connecting an end of the other segment and the first insert member; Equipped with The segment joint structure, wherein the first insert member is made of resin. [Claim 2] The first annular member is made of resin and embedded in an end portion of the one of the segments. 2. The segment joint structure according to claim 1, wherein the first insert member extends through the first annular member. [Claim 3] Further comprising a second insert member embedded in an end portion of the other segment, the connecting means connects the first insert member and the second insert member, 3. The segment joint structure according to claim 1, wherein the second insert member is made of resin. [Claim 4] the connecting means includes a first bolt and a second bolt; The first insert member has a female thread portion into which the male thread portion of the first bolt is screwed, 4. The segment joint structure according to claim 3, wherein the second insert member has a female threaded portion into which the male threaded portion of the second bolt screws. [Claim 5] The connecting means further includes a plate-like member arranged to straddle the ends of the adjacent segments, 5. The segment joint structure according to claim 4, wherein a first insertion hole through which the male threaded portion of the first bolt is inserted and a second insertion hole through which the male threaded portion of the second bolt is inserted are formed through the plate-shaped member. [Claim 6] Further, a second annular member made of resin is embedded in the end portion of the other segment, 6. The segment joint structure according to claim 3, wherein the second insert member extends so as to penetrate through the second annular member. [Claim 7] The connecting means includes a rod-shaped member having a male thread portion at at least one end, an insertion hole through which the rod-shaped member is inserted is formed at an end of the other segment, 3. The segment joint structure according to claim 1, wherein the first insert member has a female threaded portion into which the male threaded portion of the rod-shaped member screws. [Claim 8] 8. The segment joint structure according to claim 7, wherein an opening end of the insertion hole and an opening end of the female threaded portion of the first insert member face each other and communicate with each other. [Claim 9] 9. The segment joint structure according to claim 1, further comprising a resin lattice member embedded in at least one of the end portion of the one segment and the other end portion. [Claim 10] In a group of segments assembled by connecting the segments using the joint structure according to any one of claims 1 to 9, removing the connecting means from the group of segments; and Cutting the group of segments from which the connecting means have been removed with a cutter head of a shield tunneling machine; A tunnel construction method, including: [Explanation of symbols]

[0093] 1...tunnel, 2...support, 4...shield tunneling machine, 4a...cutter head, 5...part, 10,10A,10B...segment, 10AS,10BS...end face, 11,11A,11B...inner face, 12,12A,12B...recess, 15,15A,15B...bolt box, 15a,15Aa,15Ba...inner wall face, 16...insertion hole, 16a...open end, 20,20',20"...joint structure, 21A,21B...insert member, 21AT...open end, 21ATS...end face, 22...connector Step, 23A, 23B...bolt, 24...plate-shaped member, 25A, 25B...insertion hole, 25AS, 25BS...tapered surface, 30...connecting means, 31...rod-shaped member, 32...head, 33...washer, 40A, 40B...sheath tube, 41...rod-shaped member, 42...nut, 43...head, 44...washer, 55...horizontal reinforcing member, 56...vertical reinforcing member, 58...slit, 60...reinforcing means, 61a to 61g...annular member, 62...lattice-shaped member, 63...reinforcing bar unit, 64...reinforcing bar, C...gap, L...distance

Claims

1. A tunnel construction method comprising assembling arc-shaped concrete segments in a tunnel circumferential direction to form segment rings, and connecting adjacent segment rings in a tunnel axial direction to form a cylindrical lining, The joint structure is a joint in which the ends of adjacent segments are butted together, The joint structure includes: a first insert member made of resin embedded in an end portion of one of the segments; a second insert member made of resin embedded in an end portion of the other segment; a metal connecting means for connecting the first insert member and the second insert member; Equipped with the connecting means includes a first bolt, a second bolt, and a plate-like member, The first insert member has a female thread portion into which the male thread portion of the first bolt is screwed, The second insert member has a female thread portion into which the male thread portion of the second bolt is screwed, the plate-like member is disposed so as to straddle the ends of the adjacent segments, A first insertion hole through which the male thread portion of the first bolt is inserted and a second insertion hole through which the male thread portion of the second bolt is inserted are formed through the plate-like member, a recess is formed on an inner surface of the adjacent segments so as to be continuous with the adjacent segments, and a bottom surface of the recess is a concrete surface; the plate-like member, the head of the first bolt, and the head of the second bolt are housed in the recess, and the plate-like member abuts against a bottom surface of the recess; The tunnel construction method includes: In a segment group that is a part of the lining body and is connected and assembled by the joint structure, removing the connection means from the segment group; and Cutting the group of segments from which the connecting means have been removed with a cutter head of a shield tunneling machine; A tunnel construction method, including:

2. The first insert member and the second insert member are each cylindrical, The female thread portion of the first insert member is formed on one end side of the first insert member, One end of the first insert member is exposed at a bottom surface of the recess of the one segment, The female thread portion of the second insert member is formed on one end side of the second insert member, A tunnel construction method as described in claim 1 , wherein one end of the second insert member is exposed at a bottom surface of the recess of the other segment.

3. The joint structure comprises: a first annular member made of resin and embedded in an end portion of the one of the segments; a second annular member made of resin embedded in an end portion of the other segment; Further comprising: The first insert member extends through the first annular member, 3. A tunnel construction method as described in claim 1 or claim 2, wherein the second insert member extends so as to penetrate through the second annular member.

4. A tunnel construction method described in any one of claims 1 to 3, wherein the joint structure further includes a resin lattice member embedded in both the end of the one segment and the end of the other segment.

5. An inner diameter of the first insertion hole of the plate-like member is larger than an outer diameter of the male thread portion of the first bolt, The inner diameter of the second insertion hole of the plate-shaped member is larger than the outer diameter of the male thread portion of the second bolt, a neck portion between the head and the male thread portion of the first bolt is formed in a truncated cone shape and has a tapered shape that decreases in diameter from the head of the first bolt toward the male thread portion, a neck portion between the head and the male thread portion of the second bolt is formed in a truncated cone shape and has a tapered shape that decreases in diameter from the head of the second bolt toward the male thread portion, a tapered surface is formed in the first insertion hole of the plate-like member so as to correspond to a tapered shape of a neck portion of the first bolt; A tunnel construction method as described in any one of claims 1 to 4, wherein a tapered surface is formed in the second insertion hole of the plate-like member to correspond to the tapered shape of the neck of the second bolt.

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