Connection joint

Abstract

To provide a connection joint with simple connection allowing rigid connection at a low cost because it is hard to be deformed as well as compact and easy to be processed.SOLUTION: A connection joint 3 is to connect segments 2 by relatively moving one joint fitting 3a and the other joint fitting 3b in one direction. Each of one joint fitting 3a and the other joint fitting 3b is provided with a plate-like member 31 fixed on the segment 2, a first hook part 32 provided at a tip side of the plate-like member 31, and a first hook receiving part 33 provided at a base end side of the plate-like member 31. The first hook part 32 has a pair of first protruded parts 320 protruding in one direction side of the plate-like member 31, and the first hook receiving part 33 has a pair of first groove parts 330 at a front surface side and a rear surface side of the plate-like member 31, to accomplish the connection by fitting and clamping the first protruded parts 320 in the first groove parts 330.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a connecting joint suitable for connecting segments together in the construction of a shield tunnel. [Background technology]

[0002] To connect RC segments together, the connecting surfaces of the two segments to be connected are generally butted together, and the connecting plates are tightened with connecting bolts that pass through the connecting plates provided on both connecting surfaces and nuts that screw onto the connecting bolts. However, such a bolt-tightened connection structure has the following problems. - It takes time to tighten the bolts. Bolts are prone to loosening during excavation and require retightening. -Bolt hole clearance reduces roundness. -Since the metal fittings are exposed on the surface, secondary lining or rust prevention treatment is required. · To ensure smoothness of the inner surface, it is necessary to fill the holes in the bolt box. - Cannot be used for automated assembly.

[0003] Patent Document 1 also discloses a segment connection structure in which semicircular recesses are cut out and formed on the connection surfaces of both segments to be connected, a substantially cylindrical female connector having a fitting hole is attached in a semi-submerged state in the recess of one segment, and a substantially cylindrical male connector that can fit into the fitting hole of the female connector is attached in a semi-submerged state in the recess of the other segment, and the segments are moved in the tunnel axial direction and the male connector is inserted into the fitting hole of the female connector to fit them together, thereby easily and quickly connecting the segments together. Patent Document 1 also describes that both the male connector and the female connector are formed in a truncated cone shape, and that the male connector is fitted into the female connector by a wedge action. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3010011 Summary of the Invention [Problem to be solved by the invention]

[0005] The segment connection structure as described in Patent Document 1 requires filling grout into the circular holes in which the male and female connectors are housed, and furthermore, cushioning material is provided on the outer periphery of the male and female connectors, making the joints prone to deformation. Furthermore, the anchor parts of the male and female connectors have a T-shaped cross section that is integrated with the connectors, making it difficult to ensure the installation accuracy of the anchor parts when manufacturing the segments and the cross-sectional shape of the anchor parts tends to be large. This resulted in the following problems: - Suppression of deformation of joints -Cost reduction due to smaller fitting body shape and fewer processing steps -Simplification of the connection between the joint body and the anchor member - Reduction in anchor length

[0006] The problem that the present invention aims to solve is to provide a connecting joint and a segment connecting method which are resistant to deformation, compact and easy to process, therefore cost-effective, can be firmly connected, and allows for easy connection. [Means for solving the problem]

[0007] The invention according to claim 1 of the present application is a connecting joint which connects segments by moving one joint fitting and another joint fitting relatively in one direction, wherein the first joint fitting and the other joint fitting each comprise a plate-shaped member fixed to the segment, a first hook portion provided on a tip side of the plate-shaped member, and a first hook receiver portion provided on the base end side of the first hook portion of the plate-shaped member, wherein the first hook portion has a pair of first protruding portions that protrude towards one direction side of the plate-shaped member, and the first hook receiver portion has a pair of first groove portions on an obverse side and a reverse side of the plate-shaped member, and the first protruding portions are fitted into and clamped in the first groove portions to connect the segments.

[0008] The invention of claim 2 of the present application is a connecting joint as described in claim 1, characterized in that the first protrusion portion is tapered so that its width gradually narrows toward the tip, and the first groove portion is tapered so that its width gradually narrows toward the direction in which the first protrusion portion fits together.

[0009] The invention according to claim 3 of the present application is the connecting joint according to claim 1 or 2, characterized in that the distance between the opposing surfaces of the first protruding portion gradually becomes wider toward the tip.

[0010] The invention of claim 4 of the present application is a connecting joint described in any one of claims 1 to 3, characterized in that the first hook receiving portion has a regulating portion protruding to one side of the plate-shaped member base end side of the first groove portion in the plate-shaped member, and the regulating portion guides the first protruding portion when the first protruding portion is fitted into the first groove portion.

[0011] The invention according to claim 5 of the present application is a connecting joint described in any one of claims 1 to 4, characterized in that a reinforcing rib is formed on the plate-shaped member between the first hook portion and the first hook receiving portion.

[0012] An invention according to claim 6 of the present application is the connecting joint according to any one of claims 1 to 5, characterized in that the first joint fitting and the other joint fitting further include a second hook portion provided on the base end side of the plate-shaped member relative to the first hook portion and a second hook receiving portion provided on the plate-shaped member relative to the first hook receiving portion, the second hook portion having a pair of second protruding portions protruding toward one direction side of the plate-shaped member, the second hook receiving portions having a pair of second groove portions on the front and back sides of the plate-shaped member, and the second protruding portions are fitted into and clamped in the second groove portions to connect the two joint fittings.

[0013] The invention of claim 7 of the present application is a connecting joint as described in claim 6, characterized in that the second protrusion portion is tapered so that its width gradually narrows toward the tip, and the second groove portion is tapered so that its width gradually narrows toward the direction in which the second protrusion portion is fitted.

[0014] An eighth aspect of the present invention relates to a connecting joint according to the sixth or seventh aspect, characterized in that the distance between the opposing surfaces of the second protruding portion becomes gradually wider toward the tip.

[0015] The invention of claim 9 of the present application is a connecting joint described in any one of claims 1 to 8, characterized in that the plate-shaped member has mounting portions to which anchor portions protruding from both sides of the plate-shaped member in the tunnel axial direction are attached, and the thickness of the plate-shaped member in the segment thickness direction between the mounting portions is thinner than the thickness of the mounting portions.

[0016] The invention according to claim 10 of the present application is the connecting joint according to any one of claims 1 to 9, characterized in that the one joint fitting and the other joint fitting have the same shape.

[0017] The invention of claim 11 of the present application is a connecting joint described in any one of claims 1 to 10, characterized in that the plate-shaped member has an attachment portion to which anchor portions protruding on both sides of the plate-shaped member in the tunnel axial direction are attached, and an anchor portion attached to the attachment portion, and the anchor portion has a male threaded portion that passes through the attachment portion and is fastened with a nut.

[0018] The invention according to claim 12 of the present application is the connecting joint according to claim 11, characterized in that the anchor portion is U-shaped with the male thread portions on both ends. Effect of the Invention

[0019] According to the present invention, the first protruding portion of the first hook portion clamps the first groove portions on the front and back to connect the joint fittings to each other, and one joint fitting is connected to another joint fitting at two locations, at the tip and base ends of the plate-shaped member, allowing for a strong connection and strong suppression of deformation.

[0020] In addition, the first protrusion is tapered so that its width gradually narrows toward the tip, and the first groove is tapered so that its width gradually narrows toward the direction in which the first protrusion fits, making it easy to fit the first protrusion into the first groove.

[0021] In addition, since the distance between the opposing surfaces of the first protrusion gradually increases toward the tip, it becomes easier to pinch the plate-like member when connecting, and the first protrusion can be easily fitted into the first groove.

[0022] In addition, the first hook receiving portion has a regulating portion that protrudes to one side of the plate-shaped member base end side further than the first groove portion in the plate-shaped member, and the regulating portion guides the first protruding portion when it fits into the first groove portion, thereby enabling the first protruding portion of the first hook portion to fit smoothly into the first groove portion.

[0023] In addition, since a reinforcing rib is formed on the plate-shaped member between the first hook portion and the first hook receiving portion, the strength of the plate-shaped member is increased, and the deformation suppression function and shear resistance of the connecting joint are improved.

[0024] In addition, the second protruding portion of the second hook portion clamps the second groove portions on the front and back to connect the joint fittings to each other, and one joint fitting is connected to another joint fitting at four points on the tip and base ends of the plate-shaped member, allowing for a strong connection and strong suppression of deformation.

[0025] In addition, the second protrusion is tapered, gradually narrowing toward the tip, and the second groove is tapered, gradually narrowing in width toward the direction in which the second protrusion fits, making it easy to fit the second protrusion into the second groove.

[0026] In addition, since the distance between the opposing surfaces of the second protruding portion becomes gradually wider toward the tip, it becomes easier to pinch the plate-like member when connecting, and it becomes easier to fit the second protruding portion into the second groove portion.

[0027] In addition, the plate-shaped member has mounting portions to which protruding anchor portions are attached on both sides of the plate-shaped member in the tunnel axial direction, and the thickness of the plate-shaped member in the segment thickness direction between the mounting portions is thinner than the thickness of the mounting portions, so that the plate-shaped member between the protruding portions can be made thinner, thereby reducing costs.

[0028] In addition, since one joint fitting and the other joint fitting have the same shape and are connected by inverted arrangement, the number of processing steps when manufacturing the joint is reduced, thereby enabling costs to be reduced.

[0029] In addition, the plate-shaped member is provided with an attachment portion to which the anchor portions protruding from both sides in the tunnel axial direction of the plate-shaped member are attached, and an anchor portion attached to the attachment portion, and the anchor portion has a male threaded portion that passes through the attachment portion and is fastened with a nut, so there is no need to machine a female thread on the coupling fitting side, thereby reducing costs.

[0030] In addition, since the anchor portion is U-shaped with male threads on both ends, the number of parts can be reduced, and the anchoring length can be shortened. [Brief description of the drawings]

[0031] [Figure 1] FIG. 2 is a schematic diagram of a shield tunnel according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an inner view of a segment according to an embodiment of the present invention as viewed from the tunnel center side. [Diagram 3] FIG. 2 is a side view of a segment according to an embodiment of the present invention as viewed from the tunnel axis direction. [Figure 4] FIG. 2 is an end view of a segment according to an embodiment of the present invention, viewed from a circumferential direction of a tunnel. [Diagram 5] FIG. 2 is an enlarged inner view of a segment according to an embodiment of the present invention. [Figure 6] FIG. 2 is a cross-sectional view of a main portion of a segment according to an embodiment of the present invention. [Figure 7] FIG. 2 is a longitudinal sectional view of a main portion of a segment according to the embodiment of the present invention. [Figure 8] 8A and 8B show an anchor portion and a base end portion of a joint fitting according to an embodiment of the present invention, with FIG. 8(a) being a plan view and FIG. 8(b) being an end view. [Figure 9] 9A, 9B, and 9C show a plate-shaped member of a joint fitting according to an embodiment of the present invention, with FIG. 9A being a plan view, FIG. 9B being a side view, and FIG. 9C being an end view. [Figure 10] FIG. 9( a ) is a cross-sectional view taken along line AA in FIG. [Figure 11] FIG. 9( b ) is a cross-sectional view taken along line BB of FIG. [Figure 12] FIG. 9(b) is a cross-sectional view taken along line CC of FIG. [Figure 13] 1A to 1C are diagrams showing a procedure for connecting a connecting joint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, etc. It should be noted that the present invention is not limited to the embodiment. The following description relates to an embodiment in which the present invention is adopted in a connecting joint that connects adjacent segments in the circumferential direction of a shield tunnel, that is, a so-called inter-piece joint.

[0033] FIG. 1 is a schematic diagram of a shield tunnel according to an embodiment, FIG. 2 is an inner view of a segment according to an embodiment, FIG. 3 is a side view of the segment, FIG. 4 is an end view of the segment, FIG. 5 is an enlarged inner view of the segment, FIG. 6 is a cross-sectional view of a key portion of the segment, FIG. 7 is a longitudinal cross-sectional view of a key portion of the segment, FIG. 8 is a diagram showing the anchor portion and base end portion of a coupling fitting, FIG. 9 is a diagram showing a plate-shaped member of the coupling fitting, FIGS. 10 to 12 are cross-sectional views of each portion of the plate-shaped member, and FIG. 13 is a diagram showing the connection procedure of a connecting joint.

[0034] As shown in FIG. 1, a shield tunnel 1 is excavated underground by a shield machine starting from the tunnel entrance, while segments 2 are assembled inside the shield machine to form a segment ring 21. The segment ring 21 is formed by sequentially connecting pieces of each segment 2 in the circumferential direction of the tunnel on the face side of the existing segment ring 21.

[0035] As shown in FIGS. 2, 3 and 5, inter-ring joints 22 that connect the segment rings 21 to each other are provided on both side surfaces of the segment 2 in the tunnel axial direction. In this embodiment, the inter-ring joint 22 is a so-called one-pass joint consisting of a male fitting and a female fitting embedded in both side surfaces of the segment 2, respectively.

[0036] As shown in Figures 2, 4 and 5, the connecting joint 3 that connects adjacent segments 2 in the tunnel circumferential direction consists of one joint fitting 3a and another joint fitting 3b installed on connecting surfaces 20, which are both end faces of the segments 2 in the tunnel circumferential direction. The connecting pieces 312 of the first joint fitting 3a and the second joint fitting 3b are provided in recesses 23a, 23b formed in the connecting surface 20 of the segment 2.

[0037] As shown in Figures 6 and 7, the first joint fitting 3a and the other joint fitting 3b each include an anchor portion 30 embedded in the segment 2, a plate-shaped member 31 to which the anchor portion 30 is attached and partially embedded, and which is fixed by protruding from the connecting surface 20 of the segment 2 via the recesses 23a, 23b, a first hook portion 32 provided on the tip side of the plate-shaped member 31, and a first hook receiving portion 33 provided on the base end side of the first hook portion 32 of the plate-shaped member 31.

[0038] As shown in Figure 8, the anchor portion 30 consists of a U-shaped U-bolt having male thread portions 300 on both ends, and is embedded in the segment 2 with both ends facing the connecting surface 20 and aligned in the tunnel axis direction.

[0039] The anchor part 30 is attached to a mounting piece 311, which is an attachment part that protrudes on both sides in the tunnel axis direction of the plate-like member 31. The anchor part 30 is attached to the plate-like member 31 by inserting the male thread part 300 of the anchor part 30 into a through hole provided in the mounting piece 311 and fastening with a nut 301.

[0040] Since the male thread portion 300 of the anchor portion 30 passes through the mounting piece 311 and is fastened with a nut 301, there is no need to machine a female thread into the plate-like member 31 on the joint fitting side, thereby reducing costs. Since the anchor portion 30 is U-shaped, the number of parts can be reduced, and the anchoring length can be shortened.

[0041] The plate-like member 31 includes a plate material parallel to a plane including the central axis of the axial rod of the anchor part 30 (Fig. 6), and as shown in Fig. 9, the base end part 310 including the part to be embedded in the segment 2 is wide and includes attachment pieces 311 protruding on both sides in the tunnel axis direction of the base end part 310. The attachment pieces 311 are approximately cylindrical and include a through hole therein, through which the male screw part 300 of the anchor part 30 is inserted.

[0042] The thickness in the segment thickness direction of the base end 310 of the plate-like member 31 between the mounting pieces 311 on both sides is thinner than the thickness of the mounting pieces 311 (FIG. 9(c)). The mounting pieces 311 to which the anchor part 30 is attached need to have a certain thickness, but by arranging the mounting pieces 311 on both sides of the base end 310 in this way, it is possible to make the thickness thinner, thereby reducing costs.

[0043] Furthermore, by projecting the mounting piece 311, a space can be secured in which the male screw portion 300 of the anchor portion 30 penetrates and projects toward the tip side to be fastened with the nut 301.

[0044] The tip side of the base end 310 is provided with an inclined portion 310a whose thickness gradually decreases from the front side and the back side (FIGS. 6, 7, and 9). The inclined portion 310a is embedded in the segment 2, and therefore enhances the anchor effect against the tensile force acting on the plate-like member 31 due to the connection of the joint fitting.

[0045] The plate-like member 31 is integrally formed with a connecting piece 312 that extends from the tip of the inclined portion 310a of the base end portion 310 in the circumferential direction of the segment 2 by approximately half the width from one side of the base end portion 310.

[0046] As shown in Figures 9 and 10, the first hook portion 32 is provided on the front and back sides, respectively, of the tip portion of the connecting piece 312, and has a pair of first protrusions 320 protruding in one direction (the direction in which one joint fitting and another joint fitting are moved relative to each other to connect the segments) from the connecting piece 312 of the plate-shaped member.

[0047] The first protruding portion 320 of the first hook 32 is formed continuously on the front side and the back side of the base end side of the connecting piece 312 from which the first protruding portion 320 protrudes, forming a first hook bank portion 321. The first hook bank portion 321 is for forming the second groove portion 350, and also functions as a reinforcing portion (rib) of the connecting piece 312. Since the first hook bank portion 321 is for forming the second groove portion 350, it also serves as a second hook receiving portion bank portion.

[0048] 9(a), the length of the first protruding portion 320 is the same as the width of the base end portion 310. Moreover, the shape of the first protruding portion 320 when viewed from the front and back directions is tapered (double-tapered) with the width gradually narrowing toward the tip. 10, a gap having approximately the same thickness as the thickness of the connecting piece 312 is formed between the pair of first protruding portions 320. The distance between the opposing surfaces of the pair of first protruding portions 320 gradually increases toward the tip of the protruding side of the first protruding portions 320. This makes it easier to pinch the connecting piece 312 of the plate-like member 31 during connection, and makes it easier to fit the first protruding portion 320 into the first groove portion 330.

[0049] As shown in FIG. 9, the first hook receiving portion 33 is provided on the base end side of the first hook portion 32 of the plate-shaped member 31, and has a pair of first groove portions 330 on the front and back sides of the connecting piece 312 of the plate-shaped member 31. The first groove 330 is configured to include a pair of banks (second hook bank 331, restriction bank 332). The second hook bank 331 and restriction bank 332 are for forming the first groove 330, and also function as reinforcing parts (ribs) of the connecting piece 312. The second hook bank 321 and restriction bank 332 are for forming the first groove 330, and therefore also function as first hook receiving bank.

[0050] The first hook 32 and the first hook receiving portion 33 are connected by fitting and sandwiching the first protruding portion 320 into the first groove 330 formed by the second hook bank portion 331 and the restriction portion bank portion 332. The first groove 330 is tapered (double-tapered) so that the width gradually narrows in the direction in which the first protruding portion 320 fits. Since the first protruding portion 320 and the first groove 330 are tapered, the first protruding portion 320 can be easily fitted into the first groove 330.

[0051] 9 and 11, the restricting portion bank portion 332 is formed on the front and back sides of the connecting piece 312, and the restricting portion 313 provided on the first hook receiving portion 33 is formed so as to protrude continuously from the restricting portion bank portion 332. The restricting portion 313 has the same length as the first protruding portion 320, and is tapered (single taper) in width gradually narrowing in the direction in which the first protruding portion 320 fits.

[0052] The regulating portion 313 protrudes in one direction (the direction in which one coupling fitting and the other coupling fitting are moved relative to each other to connect the segments) from the connecting piece 312 of the plate-shaped member 31 toward the base end side of the first groove portion 330 in the connecting piece 312 of the plate-shaped member 31, and guides the first protruding portion 320 when the first protruding portion 320 fits into the first groove portion 330, thereby enabling the first protruding portion 320 to fit smoothly into the first groove portion 330.

[0053] As shown in Figures 9 and 12, the second hook bank portion 331 is formed on the front side and back side of the connecting piece 312, and a second protruding portion 340 of the second hook portion 34 is formed to protrude continuously from the second hook bank portion 331.

[0054] The second hook portion 34 is provided on the base end side of the first hook portion 32 of the connecting piece 312 of the plate-shaped member 31 , and is positioned so that the second protrusion portion 340 is positioned between the restricting portion 313 and the first groove portion 330 . 12, the second hook portion 34 is provided on the front and back sides of the connecting piece 312, respectively, and has a pair of second protruding portions 340 protruding toward the other side of the plate-like member 31. A gap having approximately the same thickness as the thickness of the connecting piece 312 is formed between the pair of second protruding portions 340. The distance between the opposing surfaces of the pair of second protruding portions 340 gradually increases toward the tips of the second protruding portions 340. For this reason, when connecting, it becomes easier to pinch the connecting piece 312 of the plate-like member 31, and the second protruding portions 340 are easier to fit into the second groove portions 350.

[0055] The second protruding portion 340 has the same length as the first protruding portion 320, and when viewed from the front and back directions, the second protruding portion 340 has a tapered shape (single taper) that gradually narrows toward the tip. Second protruding portion 340, restricting portion 313, and first groove portion 330 are continuously tapered, so that first protruding portion 320 that fits therein is smoothly guided.

[0056] 9, a reinforcing rib 36 is formed on the plate-shaped member 31 between the first hook portion 32 and the first hook receiving portion 33. Specifically, the reinforcing rib 36 is formed on the front and back sides of the connecting piece 312 of the plate-shaped member 31, adjacent to the tip side of the second hook bank portion 331 and along the width direction of the connecting piece 312.

[0057] The shape of the reinforcing rib 36 when viewed from the front and back directions is a ridge-like shape parallel to the tunnel axis direction as shown in Figure 9(a), and the shape when viewed from the tunnel axis direction is a trapezoid as shown in Figure 9(b). As shown in Figures 6 and 7, the reinforcing rib 36 is disposed between the first hook portion 32 and the first hook receiving portion 33 and positioned on the connecting surfaces 20a, 20b to resist shear forces on the connecting surfaces 20a, 20b of the segment 2.

[0058] The reinforcing rib 36, in cooperation with the opposing bank portion 321, forms a pair of second groove portions 350 on the front side and the back side of the second hook receiving portion 35. The reinforcing rib 36 is for forming the second groove portion 350, and therefore also serves as the bank portion of the second hook receiving portion. The second hook receiving portion 35 is provided on the connecting piece 312 of the plate-shaped member 31 closer to the tip side than the first hook receiving portion 33, and upon connection, the second protruding portion 340 fits into and clamps the second groove portion 350. At the time of connection, the engagement surfaces of the first hook bank portion 321, the first protruding portion 320, and the second hook bank portion 331, the second protruding portion 340 have a continuous single-tapered shape, so that they can be smoothly fitted together.

[0059] As shown in Figures 6 and 7, one joint fitting 3a is installed on one connecting surface 20a of the segment 2, near both ends in the tunnel axis direction, and the other joint fitting 3b is installed on the other connecting surface 20b of the segment 2, near both ends in the tunnel axis direction. At the locations of the connecting surfaces 20a, 20b where the joint fittings are to be installed, long recesses 23a, 23b are formed in the tunnel axial direction.

[0060] One joint fitting 3a is provided such that the anchor portion 30 is embedded in the segment 2 together with the base end portion 310, and the tip side of the restricting portion 313 of the plate-shaped member 31 is exposed from the bottom surface of the recess 23a. The base end side of the reinforcing rib 36 is housed within the recess 23a, and the tip end side of the reinforcing rib 36 protrudes from the recess 23a to the outside.

[0061] The plate-like member 31 is arranged so that the first protruding portion 320, the second protruding portion 340, and the restricting portion 313 protrude toward the wellhead side. Furthermore, the plate-like member 31 is arranged on the face side within the recess 23a, and a space is formed on the wellhead side into which the portion of the plate-like member 31 of the other coupling fitting 3b protruding from the recess 23b can be inserted.

[0062] The other joint fitting 3b is provided such that the anchor portion 30 is embedded in the segment 2 together with the base end portion 310, and the tip side of the restricting portion 313 of the plate-shaped member 31 is exposed from the bottom surface of the recess 23b. The base end side of the reinforcing rib 36 is housed within the recess 23b, and the tip end side of the reinforcing rib 36 protrudes from the recess 23b to the outside.

[0063] The plate-like member 31 is arranged so that the first protruding portion 320, the second protruding portion 340, and the restricting portion 313 protrude toward the face side. Furthermore, the plate-like member 31 is arranged on the mine mouth side within the recess 23b, and a space is formed on the face side into which the portion of one coupling fitting 3a of the plate-like member 31 protruding from the recess 23a can be inserted.

[0064] The plate-like members 31 of the first joint fitting 3a and the second joint fitting 3b protrude outward from the opening faces of the recesses 23a, 23b, but the protruding length is such that their tips do not collide with the bottom faces of the opposing recesses 23a, 23b when the connecting faces 20a and 20b of adjacent segments 2 are abutted against each other. In addition, when the connecting surface 20a and the connecting surface 20b are abutted against each other, the first hook portion 32, the first hook receiving portion 33, the second hook portion 34, and the second hook receiving portion 35 of one joint fitting 3a are arranged to face the first hook receiving portion 33, the first hook portion 32, the second hook receiving portion 35, and the second hook portion 34 of the other joint fitting 3b, respectively.

[0065] The method of connecting the segments 2 will be described below. To construct a new segment ring 21 adjacent to the segment ring 21 whose construction has been completed, the segments 2 are sequentially connected in the circumferential direction of the tunnel.

[0066] To connect the segments 2, the following segment 2B is positioned so that it faces the segment 2A that was previously attached to the existing segment ring 21 with a slight gap in the tunnel circumferential direction, as shown in Figure 13(a). At this time, the recess 23b formed in the connecting surface 20b of the segment 2A and the recess 23a formed in the connecting surface 20a of the segment 2B are substantially opposed to each other.

[0067] Next, as shown in FIG. 13(b), the trailing segment 2B is moved circumferentially around the tunnel to approach the leading segment 2A, and one connecting surface 20a of segment 2B is brought into contact with the other connecting surface 20b of segment 2A.

[0068] Then, the plate-like member 31 of one coupling fitting 3a installed on one connecting surface 20a of segment 2B is inserted into the space of the recess 23b formed in the other connecting surface 20b of segment 2A, and the plate-like member 31 of the other coupling fitting 3b installed on the other connecting surface 20b of segment 2A is inserted into the space of the recess 23a formed in the one connecting surface 20a of segment 2B.

[0069] Next, as shown in FIG. 13(c), the trailing segment 2B is moved toward the tunnel entrance in the tunnel axis direction, and the first hook portion 32, the first hook receiving portion 33, the second hook portion 34, and the second hook receiving portion 35 of one joint fitting 3a provided on the segment 2B are engaged with the first hook receiving portion 33, the first hook portion 32, the second hook receiving portion 35, and the second hook portion 34 of the other joint fitting 3b provided on the preceding segment 2A, respectively. Thus, the first protruding portion 320 of the first hook portion 32 is fitted into and sandwiched in the first groove portion 330 on the front and back sides of the first hook receiving portion 33, and the second protruding portion 340 of the second hook portion 34 is fitted into and sandwiched in the second groove portion 350 on the front and back sides of the second hook receiving portion 35, thereby connecting the one joint fitting 3a of segment 2B to the other joint fitting 3b of segment 2A.

[0070] [Other Modifications] The present invention is not limited to the above-mentioned embodiment, and may also include the following, for example.

[0071] In this embodiment, the anchor portion is a U-bolt, but is not limited thereto and may be, for example, a metal fitting with fixing bolts provided on both sides, etc. Also, the mounting structure between the plate-shaped member and the anchor portion can be appropriately changed depending on the shape of the anchor portion.

[0072] In the present embodiment, both the first hook portion and the first hook receiving portion, and the second hook portion and the second hook receiving portion are provided and engaged in one joint fitting, but this is not limited to this. Only the first hook portion and the first hook receiving portion may be provided without providing the second hook portion and the second hook receiving portion. Also, in addition to the first hook portion and the first hook receiving portion, and the second hook portion and the second hook receiving portion, a third or more hook portions and hook receiving portions may be provided and engaged in one joint fitting.

[0073] Each technical matter in any embodiment may be applied to another embodiment to serve as an example. [Explanation of symbols]

[0074] 1. Shield Tunnel 2 Segments 20 Connecting surface 20a One of the connecting surfaces 20b The other connecting surface 21 Segment Ring 22 Ring-to-ring joint 23a, 23b Recess 3 Connecting joints 3a One coupling fitting 3b Other fittings 30 Anchor section 300 Male thread 301 Nut 31 Plate-shaped members 310 Proximal end 311 Mounting piece 312 Connecting piece 313 Regulatory Department 32 First hook part 320 First protrusion 321 First Hook Bank 33 First hook receiving part 330 First groove 331 Second Hook Bank 332 Regulatory Section Bank Section 34 Second hook part 340 Second protrusion 35 Second hook receiving part 350 Second groove 36 Reinforcing rib

Claims

1. A coupling joint that couples segments by moving one coupling fitting relative to another coupling fitting in one direction, Each of the one joint fitting and the other joint fitting comprises a plate-shaped member fixed to a segment, a first hook portion provided on a tip side of the plate-shaped member, and a first hook receiving portion provided on a base end side of the first hook portion of the plate-shaped member, The first hook portion has a pair of first protruding portions protruding from one side of the plate-like member, The first hook receiving portion has a pair of first groove portions on the front side and the back side of the plate-shaped member, The first protrusion is fitted into the first groove to sandwich the first protrusion. A connecting joint characterized by:

2. The connecting joint described in claim 1, characterized in that the first protrusion portion is tapered in width gradually narrowing toward the tip, and the first groove portion is tapered in width gradually narrowing toward the direction in which the first protrusion portion fits.

3. 3. The coupling joint according to claim 1, wherein the distance between the opposing surfaces of the first protrusion becomes gradually wider toward the tip.

4. The first hook receiving portion has a restricting portion protruding to one side of the plate-shaped member on a base end side of the first groove portion of the plate-shaped member, The coupling joint according to any one of claims 1 to 3, wherein the restricting portion guides the first protruding portion when the first protruding portion is fitted into the first groove portion.

5. 5. The connecting joint according to claim 1, wherein a reinforcing rib is formed on the plate member between the first hook portion and the first hook receiving portion.

6. The first joint fitting and the other joint fitting further each include a second hook portion provided on the base end side of the first hook portion of the plate-shaped member, and a second hook receiving portion provided on the tip end side of the first hook receiving portion of the plate-shaped member, The second hook portion has a pair of second protruding portions protruding from one side of the plate-like member, The second hook receiving portion has a pair of second groove portions on the front side and the back side of the plate-shaped member, The second protruding portion is fitted into the second groove portion to sandwich the second protruding portion. A coupling joint according to any one of claims 1 to 5.

7. The connecting joint described in claim 6, characterized in that the second protrusion portion is tapered so that its width gradually narrows toward its tip, and the second groove portion is tapered so that its width gradually narrows toward the direction in which the second protrusion portion is fitted.

8. 8. The coupling joint according to claim 6, wherein the distance between the opposing surfaces of the second protruding portion becomes gradually wider toward the tip.

9. A connecting joint as described in any one of claims 1 to 8, characterized in that the plate-shaped member has mounting portions to which anchor portions extending from both sides of the plate-shaped member in the tunnel axial direction are attached, and the thickness of the plate-shaped member in the segment thickness direction between the mounting portions is thinner than the thickness of the mounting portions.

10. 10. The coupling joint according to claim 1, wherein the one coupling fitting and the other coupling fitting have the same shape.

11. The plate-like member has a mounting portion to which an anchor portion extending from both sides of the plate-like member in the tunnel axial direction is attached, and An anchor portion attached to the mounting portion, 11. The coupling joint according to claim 1, wherein the anchor portion has a male thread portion which is threaded through the mounting portion and fastened with a nut.

12. The coupling joint according to claim 11, wherein the anchor portion is U-shaped with the male thread portions at both ends.

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