Segment Joint

Abstract

To provide a segment joint, which prevents a female joint body from opening and suppresses displacement by guiding to a center position in a joint in a tunnel radial direction.SOLUTION: A segment joint 3 has a female coupler 4 having a groove part 41 including a groove wall part 410, and a male coupler 5 having a plate-like part 51 to be engaged with the groove part 41. A first engaging part 31 is formed of a first engaged surface 411 that protrudes from the groove wall part 410 and is engaged with the plate-like part 51, and a first engaging surface 511 that protrudes from a lateral face of the plate-like part 51 and is engaged with the first engaged surface 411. The first engaged surface 411 inclines on a side opposite to an opening as the first engaged surface is separated away from the groove wall part 410. The first engaging surface 511 inclines on a base end 50 side as the first engaging surface is separated away from the lateral face of the plate-like part 51 and restricts opening of the groove wall part 410. The plate-like part 51 has a plate-like part projection 51a and a center guide surface 51b1 that guides the plate-like part 51 to a center of the inside of the groove part 41 when moving in one direction.SELECTED DRAWING: Figure 15

Description

[Technical Field]

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

[0002] As a segment joining structure, a so-called Hooke joint is provided as an inter-segment joint between the two segments to be joined, and a joint locking portion (for example, a female portion) provided on the joint surface of one of the segments is moved in the direction of the tunnel axis to a joint locking portion (for example, a male portion) provided on the joint surface of the other segment, thereby joining the segments in each segment (Patent Document 1).

[0003] Patent Document 1 uses a female joint with two plate-shaped bases positioned apart to form an approximately C-shaped cross section, and a male joint with two plate-shaped bases positioned close together to form an approximately T-shaped cross section, and the two bases of the male joint fit into slits in the approximately C-shaped female joint, and the locking parts of both joints lock together, connecting and joining the two segments. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-328889 Summary of the Invention [Problem to be solved by the invention]

[0005] In the segment joining structure described in Patent Document 1, the female joint, which is formed by bending the exposed end of the base into an approximately L-shape, is prone to opening, and the joint may be joined away from the center position within the joint, resulting in an unstable joint.

[0006] The problem that the present invention aims to solve is to provide a segment joint that prevents the female joint body from opening and suppresses misalignment by guiding it to the center position within the tunnel radial joint, thereby achieving high construction accuracy and high quality when assembling the segments. [Means for solving the problem]

[0007] The invention of claim 1 of the present application is a segment joint comprising: a female connector having a groove formed in one direction, including a bottom, a pair of groove walls, and an opening on the segment joint surface side; and a male connector having a plate-shaped portion that protrudes from a base end on the segment joint surface side and moves along the one direction to engage with the groove portion inside the groove portion, wherein the segment joint comprises a first engaged surface that protrudes from the groove wall portion and engages with the plate-shaped portion, and a first engaging surface that protrudes from a side surface of the plate-shaped portion and engages with the first engaged surface. a first engaging portion is formed, the first engaged surface is inclined toward the opposite side of the opening as it moves away from the groove wall portion, the first engaging surface is inclined toward the base end portion as it moves away from the side surface of the plate-shaped portion, the first engaging portion regulates the opening of the groove wall portion, and the plate-shaped portion is provided with a plate-shaped portion guide ridge formed to protrude from the side surface, and a center guide surface provided on the plate-shaped portion guide ridge and that guides the plate-shaped portion to the center inside the groove portion when it moves in the one direction.

[0008] The invention according to claim 2 of the present application is the segment joint according to claim 1, characterized in that the center guide surface is formed so that its height gradually decreases along the one direction.

[0009] The invention according to claim 3 of the present application is the segment joint according to claim 1 or 2, characterized in that the center guide surface is provided closer to the base end portion than the first engagement portion.

[0010] The invention according to claim 4 of the present application is the segment joint according to claim 1 or claim 2, characterized in that the center guide surface is provided on the opposite side of the base end portion from the first engagement portion. [Effects of the Invention]

[0011] According to the present invention, the first engaging portion is formed as a V-shaped inclined surface whose spacing increases toward the segment joint surface, with the first engaged surface protruding from the groove wall portion and engaging with the plate-shaped portion, and the first engaging surface protruding from the side surface of the plate-shaped portion and engaging with the first engaged surface, the first engaged surface being inclined toward the opposite side of the opening as it moves away from the groove wall portion, and the first engaging surface being inclined toward the base end as it moves away from the side surface of the plate-shaped portion, the first engaging portion restricts the opening of the groove wall portion, the plate-shaped portion has a plate-shaped portion protrusion formed to protrude from the side surface, and a center guide surface provided on the plate-shaped portion protrusion that guides the plate-shaped portion to the center inside the groove portion when it moves in one direction, which is the segment insertion direction, i.e., in the tunnel axis direction, and by guiding the plate-shaped portion to a center position within the joint in the tunnel radial direction, the amount of eccentricity is reduced, and a segment joint with good construction precision and quality can be formed when the segments are assembled.

[0012] In addition, the center guide surface is formed so that its height gradually decreases in one direction, and when the male connector is inserted, the clearance narrows the further it goes in, and the male connector is guided to the center position inside the groove of the female connector, thereby reducing eccentricity and enabling the formation of high-quality segment joints with high construction accuracy when assembling the segments. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a shield tunnel according to a first embodiment of the present invention. [Figure 2] 1 is a plan view of a segment according to a first embodiment of the present invention, viewed from the tunnel center side. FIG. [Figure 3] FIG. 2 is a side view of the segment according to the first embodiment of the present invention, as viewed from the tunnel axis direction. [Figure 4] FIG. 2 is an enlarged view of the main parts of the female connector and male connector of the segment joint in a plan view of the segment according to the first embodiment of the present invention, viewed from the tunnel center side. [Figure 5] 5(a) and 5(b) show a female connector and a male connector of a segment joint according to a first embodiment of the present invention, with FIG. 5(a) being a side view and FIG. 5(b) being a plan view. [Figure 6] 1 is a perspective view of a segment joint according to a first embodiment of the present invention, showing a connection state using a female connector and a male connector. FIG. [Figure 7] FIG. 2 is a side view of the segment joint according to the first embodiment of the present invention, in which the female connector and the male connector are connected together. [Figure 8] 5A to 5C are diagrams showing a procedure for connecting segment joints of segments according to the first embodiment of the present invention. [Figure 9] FIG. 10 is a side view of a segment joint according to a second embodiment of the present invention, in which a female connector and a male connector are connected together. [Figure 10] 10(a) and 10(b) show a female connector and a male connector of a segment joint according to a third embodiment of the present invention, with FIG. 10(a) being a side view and FIG. 10(b) being a plan view. [Figure 11] FIG. 10 is a perspective view showing a connection state of a segment joint according to a third embodiment of the present invention using a female connector and a male connector. [Figure 12] FIG. 10 is a side view of a segment joint according to a third embodiment of the present invention, in which a female connector and a male connector are connected together. [Figure 13] FIG. 10 is a side view of a connected segment joint according to a fourth embodiment of the present invention. [Figure 14] FIG. 10 is a side view of a segment joint according to a fifth embodiment of the present invention, in which a center guide surface is provided and the segments are connected. [Figure 15] The MM cross section in FIG. 14 and FIG. 15(b) are views corresponding to the MM cross section in FIG. 14 when there is no center guide surface. [Figure 16] FIG. 13 is a side view of a segment joint according to a sixth embodiment of the present invention, in which a center guide surface is provided and the segments are joined together. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments 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 embodiments. The following description relates to an embodiment in which the present invention is adopted in a segment joint that connects segment pieces that are adjacent to each other in the circumferential direction of a tunnel in a shield tunnel.

[0015] First Embodiment This embodiment uses a female joint with two plate-shaped bases arranged two apart to form an approximately C-shaped cross section, and a male joint with two plate-shaped bases arranged close together to form an approximately T-shape, and the two bases of the male joint fit into slits in the approximately C-shaped female joint and the locking portions of both joints lock together to connect and join two segments. This solves the problem that female joints with two bases arranged two apart to form an approximately C-shaped cross section are prone to opening, and the female joint is less likely to open, improving joint strength and providing a segment joint with good construction accuracy and quality when assembling the segments.

[0016] Figure 1 is a schematic diagram of a shield tunnel, Figure 2 is a plan view of the segment viewed from the tunnel center side, Figure 3 is a side view of the segment viewed from the tunnel axis direction, Figure 4 is an enlarged view of the main parts of the female connector and male connector of the segment joint in the plan view of the segment viewed from the tunnel center side, Figure 5 shows the female connector and male connector of the segment joint, Figure 5(a) is a side view, Figure 5(b) is a plan view, Figure 6 is an oblique view of the connection status using the female connector and male connector of the segment joint, Figure 7 is a side view of the female connector and male connector of the segment joint connected, and Figure 8 is a diagram showing the connection procedure for the segment joints of the segments.

[0017] As shown in FIG. 1, a shield tunnel 1 is excavated underground by a shield machine that has started from the tunnel entrance, and 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 tunnel circumferential direction on the face side of the existing segment ring 21.

[0018] As shown in FIGS. 2 and 3, inter-ring joints 22, which are segment joints for connecting the segment rings 21 to each other, are provided on both side surfaces of the segment 2 in the tunnel axis direction. In this embodiment, the inter-ring joint 22 is a so-called one-pass joint made up of a male metal fitting and a female metal fitting embedded in both side surfaces of the segment 2, respectively.

[0019] As shown in Figures 2 and 3, the segment joint 3 (inter-piece joint) that connects adjacent segments 2 in the tunnel circumferential direction comprises a female connector 4 and a male connector 5, for example made of steel, installed on the segment joint surfaces 20, which are both end surfaces of the segment 2 in the tunnel circumferential direction. Two female connectors 4 are provided on one joint surface 20a along the tunnel axis direction, and two male connectors 5 are provided on the other joint surface 20b along the tunnel axis direction.

[0020] As shown in Figure 4, the female connector 4 and the male connector 5 each have an anchor portion 6 that is embedded in the concrete that makes up the segment 2. In this embodiment, the anchor portion 6 has a plate-like shape, but a bar-shaped anchor, a perforated steel plate anchor type, or the like can be selected as appropriate.

[0021] As shown in Figure 4, a recess 23a is provided on one of the mating surfaces 20a, and a female connector 4 is embedded adjacent to it in the tunnel axial direction. The end of the female connector 4 is provided flush with one of the mating surfaces 20a. The male connector 5 is provided on the segment 2, protruding from the other mating surface 20b.

[0022] As shown in Figure 5, the female connector 4 has a groove 41 that includes a bottom 40, a pair of groove walls 410, 410, and an opening 42 on the segment joint surface 20 side, and is formed along one direction (from the tunnel face to the tunnel entrance in the direction of the tunnel axis (arrow B)). The pair of groove walls 410, 410 are formed in parallel from an opening 42 on the segment joint surface 20 side to a bottom 40 along the approximate circumferential direction of the tunnel. An anchor portion 6 is provided on the bottom 40.

[0023] The end of the groove 41 on the tunnel face side in the tunnel axis direction is open to the recess 23a, and the end on the tunnel mouth side is not open (FIG. 5(b)). The plate-shaped portion 51 of the male connector 5 moves in the direction from the tunnel face to the tunnel entrance (one direction (arrow B)) in the axial direction of the tunnel and engages with the groove portion 41.

[0024] Each of the pair of groove walls 410 has first groove wall protrusions 41a1, 41a1 formed thereon to protrude symmetrically toward the inside of the groove 41 (FIG. 5(a)). The surfaces of the first groove wall protrusions 41a1, 41a1 facing the inside of the groove 41 are flat. The groove wall first protrusions 41a1, 41a1 have a predetermined length along the tunnel axis direction and are formed so that their width increases symmetrically as they move from the face toward the tunnel entrance (one direction (arrow B)) (Figure 5(b)).

[0025] The side of the groove wall first protrusion 41a1, 41a1 on the bottom 40 side is shaped to slope toward the opposite side of the segment joining surface 20 (opening 42) as it protrudes and moves away from each groove wall 410, 410, forming the first engaged surface 411, 411 (Figure 5(a)). That is, the groove portion 41 has first engaged surfaces 411, 411 formed as a V-shaped inclined surface that slopes toward the opposite side of the opening 42 as it protrudes and moves away from each groove wall portion 410, 410, and the spacing between them increases toward the segment joint surface.

[0026] The side of the groove wall first protrusion 41a1, 41a1 on the opening 42 side is shaped to slope toward the segment joint surface 20 (opening 42) as it protrudes and moves away from each groove wall 410, 410, forming a second engaged surface 412, 412 (Figure 5(a)). That is, the groove portion 41 is located closer to the opening 42 than the first engaged surfaces 411, 411, and has second engaged surfaces 412, 412 formed as inverted U-shaped inclined surfaces that slope toward the opening 42 as they protrude and move away from the groove wall portions 410, 410, with the mutual spacing narrowing toward the segment joint surface.

[0027] As shown in Figure 5, the male connector 5 protrudes circumferentially from the base end 50 on the segment joint surface 20 side, and has a plate-shaped portion 51 that moves from the tunnel face in the axial direction toward the tunnel entrance (one direction (arrow B)) and engages with the groove portion 41 of the female connector 4 inside the groove portion 41. The base end portion 50 is, for example, a part of the anchor portion 6, and is a portion that is embedded below the segment joint surface 20 of the plate-shaped portion 51. In this embodiment, the plate-shaped portion 51 is integrally configured to include the base end portion 50 and the anchor portion 6.

[0028] Similar to the groove portion 41, the plate-like portion 51 is also provided in a plate shape along the tunnel axial direction from the face to the tunnel mouth (one direction (arrow B)) (FIG. 5(b)).

[0029] Plate-shaped portion first protrusions 51a1, 51a1 are formed on both radially opposite sides of the plate-shaped portion 51 so as to protrude symmetrically toward the pair of groove walls 410, 410 (FIG. 5(a)). The surfaces of the plate-shaped portion first protrusions 51a1, 51a1 facing the groove walls 410, 410 are flat. The plate-shaped first protrusions 51a1, 51a1 have a predetermined length along the tunnel axis direction, and are arranged so that the side surface on the base end portion 50 side moves away from the segment joint surface 20 as it moves from the face toward the tunnel entrance (one direction (arrow B)) (Figure 5(b)).

[0030] The side surface of the plate-shaped first protrusions 51a1, 51a1 on the base end 50 side is inclined toward the base end 50 as it moves away from the side surface of the plate-shaped portion 51, forming first engagement surfaces 511, 511 (FIG. 5(a)). That is, the plate-shaped portion 51 has first engagement surfaces 511, 511 formed as V-shaped inclined surfaces that protrude from the side of the plate-shaped portion 51 and incline toward the base end portion 50 as they move away from the side, with the spacing between them widening toward the segment joint surface.

[0031] On both radially opposite sides of the plate-shaped portion 51, plate-shaped second protrusions 51a2, 51a2 are formed to protrude symmetrically toward the pair of groove walls 410, 410, closer to the base end portion 50 than the plate-shaped first protrusions 51a1, 51a1 (FIG. 5(a)). The surfaces of the plate-shaped second protrusions 51a2, 51a2 facing the groove walls 410, 410 are flat. The plate-shaped second protrusions 51a2, 51a2 have a predetermined length along the tunnel axis direction, and are arranged so that the side opposite the base end portion 50 approaches the segment joint surface 20 as it moves from the face toward the tunnel entrance (one direction (arrow B)) (Figure 5(b)).

[0032] The side surface of the plate-shaped second protrusion 51a2, 51a2 opposite the base end portion 50 is shaped to slope away from the side surface of the plate-shaped portion 51 toward the side opposite the base end portion 50 as it moves away from the side surface of the plate-shaped portion 51, forming second engagement surfaces 512, 512 (Figure 5(a)). That is, the plate-shaped portion 51 is provided with second engagement surfaces 512, 512 located closer to the base end 50 than the first engagement surfaces 511, 511, and formed as inverted U-shaped inclined surfaces that protrude from the side of the plate-shaped portion 51 and slope toward the opposite side of the base end 50 as they move away, with the spacing between them narrowing toward the segment joint surface.

[0033] Then, as shown in Figures 5(b), 6 and 7, the plate-shaped portion 51 enters (arrow A) toward the recess 23a of the segment 2 that was installed earlier in the circumferential direction of the tunnel, and then moves from the tunnel face toward the tunnel entrance (one direction (arrow B)) in the axial direction and enters the inside of the groove portion 41.The first engaging surfaces 411, 411 come into contact with the first engaging surfaces 511, 511, forming a first engaging portion 31, and the second engaging surfaces 412, 412 come into contact with the second engaging surfaces 512, 512, forming a second engaging portion 32, thereby engaging the groove portion 41 of the female connector 4 with the plate-shaped portion 51 of the male connector 5.

[0034] As shown in Figure 5(b), the first engaging surfaces 411, 411 of the female connector 4 are formed so as to be gradually positioned on the opposite side of the opening 42 (towards the bottom 40) along the tunnel axial direction from the face toward the tunnel entrance (one direction (arrow B)). In addition, the second engaging surfaces 412, 412 of the female connector 4 are formed so as to gradually move closer to the opening 42 along the tunnel axial direction from the face toward the tunnel entrance (one direction (arrow B)), i.e., so as to move away from the first engaging surfaces 411, 411 (closer to the segment joint surface 20).

[0035] As shown in Figure 5(b), the first engagement surfaces 511, 511 of the male connector 5 are formed so as to gradually move away from the tunnel face in the tunnel axial direction toward the tunnel entrance (one direction (arrow B)) toward the opposite side of the base end 50 (so as to move away from the segment joint surface 20). In addition, the second engagement surfaces 512, 512 of the male connector 5 are formed so as to gradually move closer to the base end 50 (closer to the segment joint surface 20) along the tunnel axis from the face toward the tunnel entrance (one direction (arrow B)), i.e., so as to move away from the first engagement surfaces 511, 511 (closer to the segment joint surface 20).

[0036] FIG. 8 shows a method of connecting segments 2 equipped with female connectors 4 and male connectors 5 according to the first embodiment. To construct a new segment ring 21 adjacent to the segment ring 21 for which construction has been completed, the segments 2 are sequentially connected in the circumferential direction of the tunnel.

[0037] To connect the segments 2, as shown in Figure 8(a), the following segment 2B is placed 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. At this time, the recess 23a adjacent to the female connector 4 formed on the joining surface 20a of the segment 2A and the plate-shaped portion 51 of the male connector 5 formed on the joining surface 20b of the segment 2B are substantially opposed to each other.

[0038] Next, as shown in Figure 8(b), the trailing segment 2B is moved circumferentially around the tunnel (in the direction of arrow A) to approach the leading segment 2A, and the plate-shaped portion 51 of the male connector 5 installed on the other joint surface 20b of segment 2B is inserted into the space of the recess 23a formed on one joint surface 20a of segment 2A.

[0039] Next, as shown in Figure 8(c), the trailing segment 2B is moved from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)), and the first engagement surfaces 511, 511 and second engagement surfaces 512, 512 of the plate-shaped portion 51 of the male connector 5 provided on segment 2B are engaged with the first engagement surfaces 511, 511 and second engagement surfaces 512, 512 of a pair of groove wall portions 410, 410 of the female connector 4 provided on the preceding segment 2A, respectively, thereby forming first engagement portions 31, 31 and second engagement portions 32, 32 of a predetermined length in a plane and connecting them.

[0040] In addition, when multiple engaging portions are provided, such as the first engaging portions 31, 31 and the second engaging portions 32, 32, manufacturing and construction errors may occur, but sealing material and cushioning material (not shown) are provided between the joining surfaces 20a, 20b of the segments 2A, 2B, so that manufacturing and construction errors can be absorbed.

[0041] The first engaging portions 31,31 are formed by first engaged surfaces 411,411 that protrude from the groove wall portions 410,410 and engage with the plate-shaped portion 51, and first engaging surfaces 511,511 that protrude from the side of the plate-shaped portion 51 and engage with the first engaged surfaces 411,411, and the first engaged surfaces 411,411 are inclined toward the opposite side of the opening 42 as they move away from the groove wall portions 410,410, and the first engaging surfaces 511,511 are inclined toward the base end portion 50 as they move away from the side of the plate-shaped portion 51.In other words, the first engaging portions 31,31 form V-shaped inclined surfaces whose spacing widens toward the segment joint surface 20, and the first engaging portions 31,31 regulate the opening of the groove wall portions 410,410, making it difficult for the female connector 4 to open and improving the strength of the joint.

[0042] The second engaging portions 32, 32 are formed by the second engaging surfaces 412, 412 which are located closer to the opening 42 than the first engaging surfaces 411, 411, are formed to protrude from the groove wall portions 410, 410 and engage with the plate-shaped portion 51, and the second engaging surfaces 512, 512 which are located closer to the base end portion 50 than the first engaging surfaces 511, 511, are formed to protrude from the side surfaces of the plate-shaped portion 51 and engage with the second engaging surfaces 412, 412.The first engaging portions 31, 31 and the second engaging portions 32, 32 each restrict the opening of the groove wall portions 410, 410 at two locations, making it even more difficult for the female connector 4 to open and improving the strength of the joint. Furthermore, by providing the second engaging portions 32, 32 in addition to the first engaging portions 31, 31 in this way, the plate-shaped portion 51 is guided to the central position between the first engaging portions 31, 31 and the second engaging portions 32, 32, and is also guided to the central position in the tunnel radial direction of the groove portion 41, thereby suppressing the occurrence of gaps where the engaging portions interlock, making the female connector 4 less likely to open and stabilizing the joint strength.

[0043] The second engaged surfaces 412, 412 are inclined toward the opening 42 as they move away from the groove wall portions 410, 410, and the second engaging surfaces 512, 512 are inclined toward the opposite side of the base end portion 50 as they move away from the side surface of the plate-like portion 51. In other words, the second engaging portions 32, 32 form inverted V-shaped inclined surfaces whose mutual spacing decreases toward the segment joint surface 20, and the second engaging portions 32, 32 restrict the opening of the groove wall portions 410, 410, making it even more difficult for the female connector 4 to open. Furthermore, even if a force acts on the joint portion in the direction opposite to the pulling force (the pushing direction in the circumferential direction of the tunnel (arrow A)), the second engaged surfaces 412, 412 can receive and counteract the force from the second engaging surfaces 512, 512, and the inclination causes the female connector 4 to bend in the closing direction, making it even more difficult to open.

[0044] The first engaged surfaces 411, 411 are formed so as to gradually move away from the opening 42 along one direction (arrow B), and are formed as an inclined surface that gradually moves away from the segment joint surface 20 along the one direction (arrow B), which is the segment insertion direction, i.e., the tunnel axis direction.The first engaging surfaces 511, 511 are formed so as to gradually move away from the base end portion 50 along one direction, and are formed as an inclined surface that gradually moves away from the segment joint surface along the one direction, which is the segment insertion direction.As the segments are joined along the segment joint surface 20, the plate-shaped portion 51 of the male connector 5 is guided toward the bottom 40 of the groove portion 41, and the segment joint surfaces 20, 20 become more closely attached.

[0045] In addition, the second engaged surfaces 412, 412 are formed so as to gradually move away from the first engaged surfaces 411, 411 in one direction (arrow B), and so as to gradually move away from the first engaged surfaces 411, 411 in one direction which is the segment insertion direction, i.e., the tunnel axis direction, and the second engaging surfaces 512, 512 are formed so as to gradually move away from the first engaging surfaces 511, 511 in one direction (arrow B), and so as to gradually move away from the first engaging surfaces 511, 511 in one direction which is the segment insertion direction.As a result, as the segments are joined along the segment joining surfaces 20, 20, they are guided toward the center position of the first engaging portions 31, 31 and the second engaging portions 32, 32.

[0046] <Second embodiment> A second embodiment of the present invention will be described below with reference to Fig. 9. Note that a description of the same parts as in the first embodiment will be omitted, and the differences will be mainly described.

[0047] In the second embodiment, the second engaged surfaces 412, 412 and the second engaging surfaces 512, 512 that constitute the second engaging portions 32, 32 are different from those in the first embodiment. This point will be described. FIG. 9 is a side view of the segment joint 3 according to the second embodiment, in which the female connector 4 and the male connector 5 are connected together.

[0048] The side surfaces of the groove wall first ridges 41a1, 41a1 of the female connector 4 on the opening 42 side rise perpendicularly from the groove walls 410, 410, and do not form second engaged surfaces. The side surfaces of the groove wall first ridges 41a1, 41a1 on the opening 42 side are arranged parallel to the tunnel axis direction from the tunnel face to the tunnel mouth (one direction (arrow B)) (not shown).

[0049] The side surfaces of the plate-like portion second ridges 51a2, 51a2 of the male connector 5 opposite the base end 50 rise vertically from the side surface of the plate-like portion 51 and do not form a second engagement surface. The side surfaces of the plate-like second ridges 51a2, 51a2 opposite the base end 50 are arranged parallel to the tunnel axial direction from the tunnel face to the tunnel mouth (one direction (arrow B)) (not shown).

[0050] The female connector 4 is formed with second groove wall ridges 41a2, 41a2 that protrude symmetrically from a pair of groove walls 410, 410 toward the inside of the groove 41, closer to the opening 42 than the first groove wall ridges 41a1, 41a1. The groove wall second protrusions 41a2, 41a2 have a predetermined length along the tunnel axis direction, and the side of the groove wall second protrusions 41a2, 41a2 on the bottom 40 side is parallel to the side of the groove wall first protrusions 41a1, 41a1 on the bottom 40 side, and is formed so as to be positioned further away from the segment joint surface 20 as it moves from the tunnel face in the tunnel axis direction toward the tunnel mouth (one direction (arrow B)) (not shown).

[0051] The side surfaces of the second groove wall ridges 41a2, 41a2 on the bottom 40 side are inclined away from the opening 42 as they move away from the pair of groove walls 410, 410, thereby forming second engaged surfaces 412, 412.

[0052] The male connector 5 has plate-shaped second protrusions 51a2, 51a2 formed to protrude symmetrically toward the pair of groove walls 410, 410, located closer to the base end 50 than the plate-shaped first protrusions 51a1, 51a1, and between the groove wall first protrusions 41a1, 41a1 and the groove wall second protrusions 41a2, 41a2. The plate-shaped second protrusions 51a2, 51a2 have a predetermined length along the tunnel axis direction, and the side surface of the plate-shaped second protrusions 51a2, 51a2 on the base end 50 side is parallel to the side surface of the plate-shaped first protrusions 51a1, 51a1 on the base end 50 side, and is formed so as to be positioned further away from the segment joint surface 20 as it moves from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)) (not shown).

[0053] The side surfaces of the plate-shaped second ridges 51a2, 51a2 on the base end 50 side are shaped to be inclined toward the base end 50 as they move away from the side surface of the plate-shaped portion 51, and form second engagement surfaces 512, 512.

[0054] The second engaged surfaces 412, 412 of the female connector 4 and the second engaging surfaces 512, 512 of the male connector 5 form second engaging portions 32, 32 as V-shaped inclined surfaces whose spacing widens toward the segment joint surface.

[0055] Since there are two joints at the first engagement portions 31, 31 and the second engagement portions 32, 32, the joint body is more difficult to open and can better resist force acting in the tensile direction on the joint portion.

[0056] <Third embodiment> A third embodiment of the present invention will be described below with reference to Figures 10 to 12. Note that a description of the same parts as in the first and second embodiments will be omitted, and differences will be mainly described.

[0057] In the third embodiment, third engagement portions 33 are further provided on the segment joint surface 20 side of the first engagement portions 31 and second engagement portions 32 of the first embodiment. This point will be described below. Figure 10 shows a female connector 4 and a male connector 5, with Figure 10(a) being a side view, Figure 10(b) being a plan view, Figure 11 being an oblique view of the connection between the female connector 4 and the male connector 5, and Figure 12 being a side view of the female connector 4 and the male connector 5 connected together.

[0058] On each of the pair of groove walls 410, 410, groove wall second ridges 41a2, 41a2 are formed to protrude symmetrically toward the opening 42 side and into the groove 41 from the groove wall first ridges 41a1, 41a1 (FIG. 10(a)). The surfaces of the groove wall second ridges 41a2, 41a2 facing the inside of the groove 41 are flat.

[0059] The groove wall first ridges 41a1, 41a1 and the groove wall second ridges 41a2, 41a2 are integrally connected to form ridges 41a12, 41a12 at the rear side from the tunnel face in the direction of the tunnel axis toward the entrance (FIG. 10(b)).

[0060] The side surfaces of the groove wall first ridges 41a1, 41a1 on the bottom 40 side and the side surfaces of the ridges 41a12, 41a12 on the bottom 40 side are continuous to form first engaged surfaces 411, 411 over the length L1 in the tunnel axial direction (FIG. 10(b)). The side surfaces of the groove wall first ridges 41a1, 41a1 on the opening 42 side form second engaged surfaces 412, 412 over a length L2 in the tunnel axial direction (FIG. 10(b)).

[0061] The side surface of the groove wall second protrusion 41a2, 41a2 on the bottom 40 side has a shape that slopes toward the bottom 40 as it protrudes and moves away from each groove wall 410, 410 over the length L2 in the tunnel axial direction, forming a third engaged surface 413, 413 (Figures 10(a)(b)). That is, the groove portion 41 has third engaged surfaces 413, 413 formed as V-shaped inclined surfaces that slope toward the opposite side of the opening 42 as they protrude and move away from each groove wall portion 410, 410, and the spacing between them increases toward the segment joint surface.

[0062] The length L2 in the tunnel axial direction along which the second engaged surfaces 412, 412 and the third engaged surfaces 413, 413 are formed is set to be shorter than the length L1 in the tunnel axial direction along which the first engaged surfaces 411, 411 are formed. This is because the second engaged surfaces 412, 412 and the third engaged surfaces 413, 413 perform auxiliary engagement.

[0063] As shown in FIG. 10(b), the first engaged surfaces 411, 411 and the second engaged surfaces 412, 412 are inclined symmetrically from the tunnel face toward the tunnel entrance (one direction (arrow B)) in the tunnel axis direction. The third engaged surfaces 413, 413 are arranged parallel to the first engaged surfaces 411, 411, and are inclined symmetrically with the second engaged surfaces 412, 412 from the tunnel face toward the tunnel entrance (one direction (arrow B)) in the tunnel axis direction.

[0064] The plate-shaped portion second ridges 51a2, 51a2 protruding from both side surfaces of the plate-shaped portion 51 are formed to have a length L4 in the tunnel axial direction that is shorter than that of the first embodiment (FIG. 10(b)). The side surfaces of the plate-shaped second ridges 51a2, 51a2 opposite to the base end portion 50 form second engagement surfaces 512, 512 over a length L4 in the tunnel axial direction (FIG. 10(b)).

[0065] The side surface of the plate-shaped portion second protrusion 51a2, 51a2 on the base end portion 50 side has a shape that protrudes from the side surface of the plate-shaped portion 51 and slopes toward the base end portion 50 as it moves away from the side surface over the length L4 in the tunnel axial direction, forming third engagement surfaces 513, 513 (Figures 10(a)(b)). That is, the plate-shaped portion 51 has third engagement surfaces 413, 413 formed as V-shaped inclined surfaces that incline toward the base end portion 50 as they protrude from the side surface and move away from the side surface, with the spacing between them increasing toward the segment joint surface.

[0066] As shown in FIG. 10(b), the first engagement surfaces 511, 511 and the second engagement surfaces 512, 512 are inclined symmetrically from the tunnel face in the tunnel axial direction toward the tunnel entrance (one direction (arrow B)). The third engagement surfaces 513, 513 are arranged parallel to the first engagement surfaces 511, 511, and are inclined symmetrically with the second engagement surfaces 512, 512 from the tunnel face toward the tunnel entrance (one direction (arrow B)) in the tunnel axis direction.

[0067] The length L3 in the tunnel axis direction along which the first engagement surfaces 511, 511 are formed corresponds to the length L1 in the tunnel axis direction along which the first engaged surfaces 411, 411 are formed, and the length L4 in the tunnel axis direction along which the second engagement surfaces 512, 512 and the third engagement surfaces 513, 513 are formed corresponds to the length L2 in the tunnel axis direction along which the second engaged surfaces 412, 412 and the third engaged surfaces 413, 413 are formed.

[0068] As shown in Figures 10, 11 and 12, when the plate-shaped portion 51 moves from the tunnel face in the tunnel axis direction toward the tunnel entrance (one direction (arrow B)) and enters the inside of the groove portion 41, the first engaging surfaces 511, 511 engage with the first engaged surfaces 411, 411 to form first engaging portions 31, 31, the second engaging surfaces 512, 512 engage with the second engaged surfaces 412, 412 to form second engaging portions 32, 32, and the third engaging surfaces 513, 513 engage with the third engaged surfaces 413, 413 to form third engaging portions 33, 33.

[0069] The third engaging portions 33 are formed by third engaged surfaces 413, 413 located closer to the opening 42 than the second engaged surfaces 412, 412, formed to protrude from the groove wall portions 410, 410, and engaging with the plate-shaped portion 51, and third engaging surfaces 513, 513 located closer to the base end portion 50 than the second engaging surfaces 512, 512, formed to protrude from the side surfaces of the plate-shaped portion 51, and engaging with the third engaged surfaces 413, 413. As the third engaged surfaces 413, 413 move away from the groove wall portions 410, 410, Therefore, it is inclined toward the opposite side of the opening 42, and the third engagement surfaces 513, 513 are inclined toward the base end 50 as they move away from the side of the plate-shaped portion 51.In other words, the third engagement portions 33, 33 form a V-shaped inclined surface whose spacing increases toward the segment joint surface 20, and the third engagement portions 33, 33 regulate the opening of the groove wall portions 410, 410.As a result, the opening of the groove wall portions 410, 410 of the female connector 4 is restricted in three places, making the fitting body less likely to open and improving the strength of the fitting.

[0070] <Fourth embodiment> The fourth embodiment of the present invention will be described below with reference to Fig. 13. Note that a description of the same parts as those in the first to third embodiments will be omitted, and the following mainly focuses on the differences.

[0071] In the fourth embodiment, third engagement portions 33 are further provided on the segment joint surface 20 side of the first engagement portions 31 and second engagement portions 32 of the second embodiment. This point will be described below. FIG. 13 is a side view of the segment joint 3 with the female connector 4 and male connector 5 connected together.

[0072] The side of the groove wall second protrusion 41a2, 41a2 formed to protrude into the groove 41 from a pair of groove wall portions 410, 410, on the opening 42 side, has a shape that slopes toward the segment joint surface 20 (opening 42) as it protrudes and moves away from each groove wall portion 410, 410, forming a third engaged surface 413, 413. That is, the groove portion 41 is located closer to the opening 42 than the second engaged surfaces 412, 412, and has third engaged surfaces 413, 413 formed as inverted U-shaped inclined surfaces that slope toward the opening 42 as they protrude and move away from the groove wall portions 410, 410, with the mutual spacing narrowing toward the segment joint surface.

[0073] Although not shown, the first engaged surfaces 411, 411 and the second engaged surfaces 412, 412 are arranged parallel to each other from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)). Furthermore, the third engaged surfaces 413, 413 are inclined symmetrically with the second engaged surfaces 412, 412 from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)).

[0074] Plate-shaped portion third ridges 51a3 are formed on both radially opposite sides of the tunnel of the plate-shaped portion 51 so as to protrude symmetrically toward the pair of groove walls 410, 410, respectively, and are located closer to the base end portion 50 than the plate-shaped portion second ridges 51a2, 51a2 and closer to the segment joint surface 20 than the groove wall second ridges 41a2, 41a2. The surfaces of the plate-shaped portion third ridges 51a3, 51a3 facing the groove walls 410, 410 are flat. The plate-shaped third protrusions 51a3, 51a3 have a predetermined length along the tunnel axis direction, and are arranged so that the side opposite the base end portion 50 approaches the segment joint surface 20 as it moves from the face toward the tunnel entrance (one direction (arrow B)) (not shown).

[0075] The side surfaces of the plate-shaped third ridges 51a3, 51a3 opposite the base end 50 are inclined away from the base end 50 as they move away from the side surface of the plate-shaped portion 51, forming third engagement surfaces 513, 513. That is, the plate-shaped portion 51 is provided with third engagement surfaces 513, 513 which are located closer to the base end 50 than the second engagement surfaces 512, 512 and which are formed as inverted U-shaped inclined surfaces which incline toward the opposite side of the base end 50 as they protrude from the side of the plate-shaped portion 51 and move away from it, with the spacing between them decreasing toward the segment joint surface.

[0076] Although not shown, the first engagement surfaces 511, 511 and the second engagement surfaces 512, 512 are provided parallel to each other from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)). Furthermore, the third engagement surfaces 513, 513 are inclined symmetrically with the second engagement surfaces 512, 512 from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction (arrow B)).

[0077] When the plate-shaped portion 51 moves from the tunnel face in the direction of the tunnel axis toward the tunnel entrance (one direction) and enters the inside of the groove portion 41, the first engaging surfaces 511, 511 engage with the first engaged surfaces 411, 411 to form the first engaging portions 31, 31, the second engaging surfaces 512, 512 engage with the second engaged surfaces 412, 412 to form the second engaging portions 32, 32, and the third engaging surfaces 513, 513 engage with the third engaged surfaces 413, 413 to form the third engaging portions 33, 33.

[0078] The third engaging portions 33 are formed by third engaged surfaces 413, 413 located closer to the opening 42 than the second engaged surfaces 412, 412, formed to protrude from the groove wall portions 410, 410, and engaging with the plate-shaped portion 51, and third engaging surfaces 513, 513 located closer to the base end portion 50 than the second engaging surfaces 512, 512, formed to protrude from the side surfaces of the plate-shaped portion 51, and engaging with the third engaged surfaces 413, 413. As the third engaged surfaces 413, 413 move away from the groove wall portions 410, 410, Therefore, it is inclined toward the opening 42, and the third engagement surfaces 513, 513 are inclined toward the opposite side of the base end 50 as they move away from the side of the plate-shaped portion 51.In other words, the third engagement portions 33, 33 have inverted U-shaped inclined surfaces whose mutual spacing decreases toward the segment joint surface 20, and the third engagement portions 33, 33 regulate the opening of the groove wall portions 410, 410.As a result, the opening of the groove wall portions 410, 410 of the female connector 4 is restricted in three places, making the joint less likely to open and improving the joint strength.

[0079] <Fifth embodiment> Hereinafter, the fifth embodiment of the present invention will be described with reference to Figures 14 and 15. Note that a description of the same parts as in the first to fourth embodiments will be omitted, and the following mainly describes the different parts.

[0080] Like the first embodiment, this embodiment solves the problem of the female joint being prone to opening, and also suppresses misalignment by guiding it to the center position within the tunnel radial joint, thereby providing a segment joint with high construction accuracy and quality when assembling the segments.

[0081] Figure 14 is a side view of the female connector and male connector of a segment joint connected together, Figure 15(a) shows the connection procedure, with the right side being an MM cross-sectional view in Figure 14, and Figure 15(b) shows the connection procedure when there is no center guide surface, with the right side being a view equivalent to the MM cross-sectional view in Figure 14.

[0082] The first engaged surfaces 411, 411 formed on the groove wall first protrusions 41a1, 41a1 of the female connector 4 and the first engaging surfaces 511, 511 formed on the plate-shaped first protrusions 51a1, 51a1 of the male connector 5 are similar to the first embodiment, forming the first engaging portions 31, 31 as V-shaped inclined surfaces whose spacing widens toward the segment joint surface, thereby regulating the opening of the groove wall portions 410, 410.

[0083] The side surfaces of the groove wall first ridges 41a1, 41a1 of the female connector 4 on the opening 42 side rise perpendicularly from the groove walls 410, 410, and do not form second engaged surfaces. The side surfaces of the groove wall first ridges 41a1, 41a1 on the opening 42 side are arranged parallel to the tunnel axis direction from the tunnel face to the tunnel mouth (one direction (arrow B)) (not shown).

[0084] On both radially opposite sides of the plate-shaped portion 51, plate-shaped portion guide protrusions 51b, 51b are formed symmetrically protruding toward each of the pair of groove wall portions 410, 410, closer to the base end portion 50 than the plate-shaped portion first protrusions 51a1, 51a1 and positioned on the opening 42 side of the groove wall portion first protrusions 41a1, 41a1. The plate-shaped portion guide protrusions 51b, 51b are formed with a predetermined length parallel to the tunnel axis direction, and the side surface on the base end portion 50 side and the side surface opposite the base end portion 50 rise vertically from the side surface of the plate-shaped portion 51.

[0085] The plate-shaped guide ridges 51b, 51b are provided with center guide surfaces 51b1, 51b1 on the surfaces facing the groove walls 410, 410, respectively. As shown in FIG. 14, the center guide surfaces 51b1, 51b1 are surfaces parallel to the tunnel circumferential direction, and as shown in FIG. 15(a), they are inclined so that the height of the plate-shaped guide ridges 51b, 51b gradually decreases from the tunnel face in the axial direction toward the tunnel entrance (arrow B).

[0086] The highest part of the center guide surfaces 51b1, 51b1 is set higher than the height of the plate-shaped portion first ridges 51a1, 51a1 (FIG. 14). The center guide surfaces 51b1, 51b1 are provided closer to the base end 50 of the plate-shaped portion 51 than the first engagement portions 31, 31.

[0087] As shown in Figure 15(a), when the male connector 5 is moved in one direction (arrow B) from the tunnel face in the axial direction toward the tunnel entrance and inserted into the groove 41 of the female connector 4, the clearance between the plate-shaped guide ridges 51b, 51b and the groove walls 410, 410 gradually narrows the further it goes. In other words, by guiding the male connector 5 to the center position inside the groove 41 of the female connector 4 (the center position in the radial direction of the tunnel), the amount of eccentricity (misalignment) is suppressed, and the first engaged surfaces 411, 411 and the first engaging surfaces 511, 511 are engaged at the center position, more reliably preventing the groove walls 410, 410 from opening, resulting in the formation of a segment joint with good construction precision and quality when the segments are assembled.

[0088] FIG. 15(b) is a side view of a male connector 5 without plate-like portion guide ridges 51b, 51b inserted in the tunnel axial direction and connected to a female connector 4. FIG. In such a case, when the male connector 5 penetrates into the female connector 4, a large eccentricity T occurs in the male connector 5 relative to the center position inside the groove portion 41 of the female connector 4, causing the clearance to become biased, and the first engaged surfaces 411, 411 and the first engaging surfaces 511, 511 engage away from the center position, making it unstable to prevent the groove walls 410, 410 from opening.

[0089] Sixth Embodiment The sixth embodiment of the present invention will be described below with reference to Fig. 16. Note that a description of the same parts as those in the first to fifth embodiments will be omitted, and the following mainly describes the different parts.

[0090] In this embodiment, the center guide surfaces 51b1, 51b1 of the fifth embodiment are provided on the plate-shaped first ridges 51a1, 51a1. The plate-shaped first ridges 51a1, 51a1 also function as plate-shaped guide ridges 51b, 51b. FIG. 16 is a side view of the female connector and male connector of the segment joint connected together.

[0091] The plate-shaped first ridges 51a1, 51a1 (plate-shaped guide ridges 51b, 51b) are provided with center guide surfaces 51b1, 51b1 on the surfaces facing the groove wall portions 410, 410, respectively. The center guide surfaces 51b1, 51b1, like the center guide surfaces 51b1, 51b1 of the fifth embodiment, are surfaces parallel to the circumferential direction of the tunnel and are inclined so that the height of the plate-shaped portion first protrusion ridges 51a1, 51a1 (plate-shaped portion guide protrusion ridges 51b, 51b) gradually decreases from the tunnel axial face toward the tunnel entrance (one direction (arrow B)).

[0092] The center guide surfaces 51b1, 51b1 are provided on the opposite side of the base end portion 50 of the plate-shaped portion 51 from the first engagement portions 31, 31. In this embodiment, the plate-shaped portion first protrusions 51a1, 51a1 are given the function of the plate-shaped portion guide protrusions 51b, 51b, so there is no need to provide separate plate-shaped portion guide protrusions 51b, 51b, and a simple structure can be formed.

[0093] [Other Modifications] The present invention is not limited to the above-described embodiment, and may also include the following, for example.

[0094] In this embodiment, the present invention is adopted in a segment joint that connects segment pieces adjacent to each other in the tunnel circumferential direction, but is not limited to this and can also be adopted in a segment joint that is an inter-ring joint. Furthermore, the present invention is not limited to coupling joints that move in the tunnel axial direction, but may also be applied to coupling joints that move in the tunnel radial direction, in which case the tunnel radial direction corresponds to one direction in the present invention.

[0095] In the first to fourth embodiments, a plurality of engagement portions are provided to restrict the opening of the groove wall portion, but it may be configured with only the first engagement portion.

[0096] Each technical matter in any of the embodiments may be applied to other embodiments to form examples.

[0097] For example, the plate-shaped portion guide ridges 51b having the center guide surfaces 51b1, 51b1 of the fifth embodiment may be further provided closer to the base end portion 50 than the plate-shaped portion second ridges 51a2, 51a2 of the first embodiment. Also, for example, the plate-shaped third ridges 51a3, 51a3 of the second embodiment may be given the function of the plate-shaped guide ridges 51b, 51b having the center guide surfaces 51b1, 51b1. [Explanation of symbols]

[0098] 1. Shield Tunnel 2 segments 20 Segment joint surface 20a One of the joint surfaces 20b Other joint surface 21 Segment Ring 22 Ring-to-ring joint 23a Recess 3 Segment Joint 31 First engaging part 32 Second engaging part 33 Third engaging part 4 Female connector 40 bottom 41 Groove 410 Groove wall 411 First engaged surface 412 Second engaged surface 413 Third engaged surface 41a1 Groove wall first protrusion 41a2 Groove wall second protrusion 42 Opening on the segment joint surface side 5 Male connector 50 Proximal end 51 Plate-shaped part 511 First engagement surface 512 Second engagement surface 513 Third engagement surface 51a Plate-shaped protrusion 51a1 Plate-shaped portion first protrusion 51a2 Plate-shaped portion second protrusion 51a3 Third protrusion of plate-shaped part 51b Plate-shaped portion guide protrusion 51b1 Center guide surface 6 Anchor part

Claims

1. A segment joint comprising: a female connector having a groove formed in one direction, the female connector including a bottom, a pair of groove walls, and an opening on the segment joint surface side; and a male connector having a plate-like portion that protrudes from a base end on the segment joint surface side and moves along the one direction to engage with the groove inside the groove, a first engaged surface formed to protrude from the groove wall portion and engage with the plate-shaped portion; a first engaging surface formed to protrude from a side surface of the plate-shaped portion and to engage with the first engaged surface, the first engaged surface is inclined toward the opposite side of the opening as it moves away from the groove wall portion, the first engagement surface is inclined toward the base end portion as it moves away from the side surface of the plate-shaped portion, the first engagement portion restricts the opening of the groove wall portion, The plate-shaped portion includes a plate-shaped portion guide protrusion formed to protrude from a side surface, and a center guide surface provided on the plate-shaped portion guide protrusion and guiding the plate-shaped portion to the center inside the groove portion when the plate-shaped portion moves in the one direction. A segment joint characterized by:

2. 2. The segment joint according to claim 1, wherein the center guide surface is formed so as to gradually decrease in height along the one direction.

3. The center guide surface is provided closer to the base end portion than the first engagement portion.

3. The segment joint according to claim 1 or claim 2.

4. The center guide surface is provided on the opposite side of the base end portion from the first engagement portion.

3. The segment joint according to claim 1 or claim 2.

Images