Plate-shaped connection member and segment joint using the same

Abstract

To provide a plate-like connecting member that is firmly anchored to a segment and increases connection strength between the segments, and a segment joint using the plate-like connecting member.SOLUTION: A plate-shaped connecting member 100 is used in a segment joint having an engagement portion to be engaged with another segment joint and an anchor portion to be embedded in the segment, and it comprises a plate-shaped portion 101 and a pair of one-side projecting portions 102 protruding from thickness direction sides opposite a thickness direction of one end in a longitudinal direction of the plate-shaped portion 101, respectively. The one-side projecting portion 102 has one-side inclined surface portion 1020 facing toward the other end in the longitudinal direction and inclined toward the other end in the longitudinal direction as it moves away from the thickness direction side of the plate portion 101, and the one- side inclined surface portion 1020 is used for the anchor portion.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a plate-shaped connecting member used to connect segments together in the construction of a shield tunnel, and a segment joint using a plate-shaped connecting member. [Background technology]

[0002] A known segment joining structure is one in which so-called Hook joints are provided as inter-segment joints between the two segments to be joined, and a joint locking portion (for example, a male portion) provided on the joint surface of one of the segments is moved in the tunnel axial direction to a joint locking portion (for example, a female portion) provided on the joint surface of the other segment (Patent Document 1).

[0003] Patent Document 1 discloses a female joint having two plate-shaped bases spaced apart to form an approximately C-shaped cross section, and a male joint having two plate-shaped bases close together to form an approximately T-shape; 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 the two segments. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-328889 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the segment joining structure as described in Patent Document 1 above, anchor parts made of rod material are attached to the base of the female joint and male joint, and it may be expected that the anchor parts will be able to improve the fixation of the female joint and male joint to the segment to which a tensile force is applied.

[0006] The problem that the present invention aims to solve is to provide a plate-shaped connecting member that is firmly fixed to segments and increases the connecting strength between the segments, and a segment joint that uses this plate-shaped connecting member. [Means for solving the problem]

[0007] The invention according to claim 1 of the present application is a plate-shaped connecting member for use in a segment joint having an engaging portion to engage with another segment joint and an anchor portion to be embedded in a segment, the plate-shaped connecting member comprising: a plate-shaped portion that extends in the vertical and horizontal directions and has a thickness in the thickness direction, and has a one vertical end that is one end in the vertical direction and an other vertical end that is the other end in the vertical direction; and a pair of one-side protrusions that protrude from a thickness-direction side surface of the one vertical end of the plate-shaped portion that faces in the thickness direction and faces the other vertical end, the one-side protrusions having a one-side inclined surface portion that faces toward the other vertical end and inclined toward the other vertical end as it moves away from the thickness-direction side surface of the plate-shaped portion, the one-side inclined surface portion being used for the anchor portion.

[0008] The invention according to claim 2 of the present application is a plate-shaped connecting member for use in a segment joint having an engaging portion for engaging with another segment joint and an anchor portion embedded in a segment, the plate-shaped connecting member comprising: a plate-shaped portion extending in the vertical and horizontal directions and having a thickness in the thickness direction; a pair of first protrusions each protruding from a thickness direction side surface facing in the thickness direction of one vertical end portion which is one end portion of the plate-shaped portion in the vertical direction; and a pair of second protrusions each protruding from a thickness direction side surface facing in the thickness direction of the other vertical end portion which is the other end portion of the plate-shaped portion in the vertical direction; the one protrusion portion has one inclined surface portion that faces toward the other end in the vertical direction and inclines toward the other end in the vertical direction as it moves away from the thickness direction side surface of the plate-like portion, and the other protrusion portion has another inclined surface portion that faces toward the one end in the vertical direction and inclines toward the one end in the vertical direction as it moves away from the thickness direction side surface of the plate-like portion, and one of the one inclined surface portion and the other inclined surface portion is used as the engagement portion and the other is used as the anchor portion.

[0009] The invention of claim 3 of the present application is a plate-shaped connecting member as described in claim 2, characterized in that the horizontal edges of the one inclined surface portion and the other inclined surface portion at the same distance from the thickness direction side surface of the one inclined surface portion and the other inclined surface portion are positioned symmetrically about the vertical center line of the plate-shaped portion.

[0010] The invention of claim 4 of the present application is a plate-like connecting member as described in claim 2, characterized in that the horizontal edges of the one inclined surface portion and the other inclined surface portion are parallel at locations at the same distance from the thickness direction side surface of the one inclined surface portion and the other inclined surface portion.

[0011] The invention of claim 5 of the present application is a segment joint using the plate-shaped connecting member described in any one of claims 2 to 4, characterized in that one of the plate-shaped connecting members is used as a male segment joint, and two of the plate-shaped connecting members are used as female segment joints by arranging the one side protrusion portions or the other side protrusion portions facing each other, and either one of the one side inclined surface portion and the other side inclined surface portion of the male segment joint engages with either one of the one side inclined surface portion and the other side inclined surface portion of the female segment joint to form the engagement portion. Effect of the Invention

[0012] According to the invention of claim 1, one inclined surface portion of one protrusion portion used in the anchor portion is inclined toward the other longitudinal end portion as it moves away from the thickness-wise side surface of the plate-shaped portion. Therefore, when a tensile force is applied to the plate-shaped connecting member, the anchor portion bites into the concrete that makes up the segment and resists the pull-out force, improving the pull-out prevention effect.

[0013] According to the invention of claim 2, in addition to the effects achieved by the invention of claim 1, one of the one inclined surface portion of the one protrusion portion provided at one longitudinal end portion and the other inclined surface portion of the square protrusion portion provided at the other longitudinal end portion is used as an engagement portion and the other is used as an anchor portion, so there is no need to consider the attachment direction of the plate-shaped connecting member to the segments. As a result, the work of embedding the plate-shaped connecting member in the segments is facilitated, work efficiency is improved, and costs can be reduced. In addition, the one inclined surface portion or the other inclined surface portion that serves as the engaging portion inclines toward the opposite end portion in the vertical direction as it moves away from the thickness direction side of the plate-shaped portion, thereby restricting the opening of other segment joints that engage with the engaging portion, thereby improving the joint strength.

[0014] According to the invention of claim 5, in addition to the effects of the invention of claim 2, the male segment joint and the female segment joint are constructed using three plate-shaped connecting members of the same shape, so there is no need to manufacture many types of parts, and costs are low. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a shield tunnel according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the segment according to the first embodiment of the present invention, viewed from the tunnel center side. [Diagram 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 a female segment joint and a male segment joint in a plan view of the segment according to the first embodiment of the present invention, viewed from the tunnel center side. [Diagram 5] 5(a) shows a plate-shaped connecting member according to a first embodiment of the present invention, with FIG. 5(a) being a plan view, FIG. 5(b) being a rear view, FIG. 5(c) being a bottom view, FIG. 5(d) being a front view, and FIG. 5(e) being an enlarged cross-sectional view of a main portion. [Figure 6] 1 is a plan view showing an example of use of a plate-shaped connecting member according to a first embodiment of the present invention. [Figure 7] FIG. 2 is an exploded side view of the segment joint according to the first embodiment of the present invention. [Figure 8] FIG. 2 is an exploded plan view of the segment joint according to the first embodiment of the present invention. [Figure 9] FIG. 1 is a perspective view of a segment joint showing a first embodiment of the present invention. [Figure 10] 1 is a cross-sectional view of a segment joint showing a first embodiment of the present invention. [Figure 11] 4A to 4C are diagrams showing a procedure for connecting segments using a segment joint according to the first embodiment of the present invention. [Figure 12] 4 is a plan view showing another example of use of the plate-shaped connecting member according to the first embodiment of the present invention. FIG. [Figure 13] 13(a) shows a plate-shaped connecting member according to a second embodiment of the present invention, with FIG. 13(a) being a plan view, FIG. 13(b) being a rear view, FIG. 13(c) being a bottom view, FIG. 13(d) being a front view, and FIG. 13(e) being an enlarged cross-sectional view of a main portion. [Figure 14]FIG. 11 is a plan view showing an example of use of the plate-shaped connecting member according to the second embodiment of the present invention. [Figure 15] 13 is a plan view showing another example of use of the plate-shaped connecting member according to the second embodiment of the present invention. FIG. [Figure 16] FIG. 11 is a perspective view of a segment joint showing a third embodiment of the present invention. [Figure 17] FIG. 11 is a cross-sectional view of a segment joint showing a third embodiment of the present invention. [Figure 18] FIG. 11 is a plan view showing a first example of use of a plate-shaped connecting member according to a third embodiment of the present invention. [Figure 19] FIG. 11 is a plan view showing a second example of use of the plate-shaped connecting member according to the third embodiment of the present invention. [Figure 20] FIG. 11 is a plan view showing a third example of use of the plate-shaped connecting member according to the third embodiment of the present invention. [Figure 21] FIG. 11 is a plan view showing a fourth example of use of the plate-shaped connecting member according to the third embodiment of the present invention. [Figure 22] FIG. 11 is a plan view showing a first example of use of a plate-shaped connecting member according to a fourth embodiment of the present invention. [Diagram 23] FIG. 13 is a plan view showing a second example of use of the plate-shaped connecting member according to the fourth embodiment of the present invention. [Figure 24] FIG. 13 is a plan view showing a third example of use of the plate-shaped connecting member according to the fourth embodiment of the present invention. [Diagram 25] FIG. 13 is a plan view showing a fourth example of use of the plate-shaped connecting member according to the fourth embodiment of the present invention. [Figure 26] FIG. 11 is a perspective view of a segment joint showing a fifth embodiment of the present invention. [Figure 27] FIG. 11 is a cross-sectional view of a segment joint showing a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 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 segment joint that connects adjacent segment pieces in a shield tunnel in the tunnel circumferential direction.

[0017] <First embodiment> This embodiment consists of a female side segment joint having a groove with an approximately C-shaped cross section, and a male side segment joint having a approximately T-shaped protrusion, and the plate-shaped portion of the male side segment joint fits into the groove of the female side segment joint so that the engaging portions and engaged portions of both segment joints engage with each other, thereby solving the problem that the groove of the female side segment joint is easily opened in the segment joint, which improves the fixing of the female side segment joint and the male side segment joint to the segments, improves joint strength, and provides a low-cost segment joint that facilitates the embedding of the plate-shaped connecting member used in the male side segment joint.

[0018] Figure 1 is a schematic diagram of a shield tunnel, Figure 2 is a plan view of the segment seen from the center of the tunnel, Figure 3 is a side view of the segment seen from the tunnel axis direction, Figure 4 is an enlarged view of the main parts of the female segment joint and male segment joint of the segment joint in the plan view seen from the center of the tunnel, Figure 5 shows a plate-shaped connecting member, and Figure 5(a) is a plan view, Figure 5(b) is a rear view, Figure 5(c) is a bottom view, Figure 5(d) is a front view, Figure 5(e) is an enlarged cross-sectional view of the main parts, Figure 6 is a plan view showing an example of use of the plate-shaped connecting member, Figure 7 is an exploded side view of the segment joint, Figure 8 is an exploded plan view of the segment joint, Figure 9 is an oblique view of the segment joint, Figure 10 is a cross-sectional view of the segment joint, Figure 11 is a diagram showing the procedure for connecting segments using a segment joint, and Figure 12 is a plan view showing another example of use of the plate-shaped connecting member.

[0019] 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.

[0020] 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 axial direction. In this embodiment, the inter-ring joint 22 is a so-called one-pass joint made up of a male fitting and a female fitting embedded in both side surfaces of the segment 2, respectively.

[0021] 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 segment joint 4 and a male segment joint 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 segment joints 4 are provided on one joint surface 20a along the tunnel axis direction, and two male segment joints 5 are provided on the other joint surface 20b along the tunnel axis direction. In this embodiment, a plate-shaped connecting member 100 as shown in FIG.

[0022] As shown in FIG. 4, the female segment joint 4 and the male segment joint 5 each have an embedded portion 44, 54 that is embedded in the concrete that constitutes the segment 2.

[0023] As shown in Fig. 4, a recess 23a is provided in one of the joint surfaces 20a, and a female segment joint 4 is embedded adjacent to the recess 23a in the tunnel axis direction. The end of the female segment joint 4 is provided flush with one of the joint surfaces 20a. Note that in this embodiment, the end of the female segment joint 4 is provided flush with one of the joint surfaces 20a, but this is not limited thereto, and the end may be provided inside the joint surface 20a, i.e., the end may also be embedded. The male segment joint 5 is provided on the segment 2, protruding from the other joint surface 20b.

[0024] As shown in FIG. 5, the plate-like connecting member 100 used in the male segment joint 5 has a plate-like portion 101 that extends in the vertical and horizontal directions, has a thickness in the thickness direction, and has one vertical end that is one end in the vertical direction, and another vertical end that is the other end in the vertical direction. In this embodiment, the plate-like portion 101 is formed in a rectangular strip shape that is long in the vertical direction and short in the horizontal direction.

[0025] In addition, the plate-shaped connecting member 100 has a pair of one-side protrusions 102 each protruding from a thickness-wise side surface facing in the thickness direction of one vertical end portion, which is one end portion of the plate-shaped portion 101 in the vertical direction, and a pair of other-side protrusions 103 each protruding from a thickness-wise side surface facing in the thickness direction of the other vertical end portion, which is the other end portion of the plate-shaped portion 101 in the vertical direction. In the following description, one end in the vertical direction is referred to as the right side, the other end in the vertical direction is referred to as the left side, one of the sides in the thickness direction is referred to as the top face, the other side in the thickness direction is referred to as the bottom face, the side that intersects the right and left faces is referred to as the front face, and the other side that intersects the right and left faces is referred to as the back face.

[0026] A pair of one-sided protrusion portions 102, 102 provided on the right end portions of the top and bottom surfaces of the plate-shaped portion 101 each face toward the left side (the other end portion in the vertical direction) and have one-sided inclined surface portions 1020, 1020 that incline toward the left side (the other end portion in the vertical direction) as they move away from the top and bottom surfaces (side surfaces in the thickness direction) of the plate-shaped portion 101.

[0027] A pair of other protrusion portions 103, 103 provided on the left end portions of the top and bottom surfaces of the plate-shaped portion 101 each face toward the right side (one end portion in the vertical direction) and have other inclined surface portions 1030, 1030 that incline toward the right side (one end portion in the vertical direction) as they move away from the thickness-wise side surface of the plate-shaped portion 101.

[0028] The one inclined surface portion 1020 and the other inclined surface portion 1030 on the top surface side, and the one inclined surface portion 1020 and the other inclined surface portion 1030 on the bottom surface side are in a positional relationship in which the horizontal sides L (FIG. 5(e)) of the one inclined surface portion 1020 and the other inclined surface portion 1030 at the same distance h from the top surface and bottom surface (thickness direction side surface) of the plate-like portion 101 are symmetrical in plan view with respect to the vertical center line c of the plate-like portion 101, and are inclined with respect to the vertical center line c. In other words, the one inclined surface portion 1020 and the other inclined surface portion 1030 are in a position of plane symmetry with respect to a plane extending in the thickness direction that passes through the vertical center line c. The inclined surface portions 1020, 1020 on the top and bottom sides and the inclined surface portions 1030, 1030 on the other sides are inclined so that the distance between them gradually increases from the rear surface of the plate-like portion 101 toward the front surface.

[0029] As shown in Figures 6 to 9, the female segment joint 4 has a groove portion 41 including a bottom wall 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 face to the tunnel portal in the tunnel axial direction (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 wall 40 along the approximate circumferential direction of the tunnel. A plate-like body forming an embedded portion 44 is connected to the bottom wall 40.

[0030] The end of the groove 41 on the face side in the tunnel axial direction opens into the recess 23a, and the end on the tunnel mouth side (terminal side in one direction) is closed by a side wall 43 (Figure 8). Male segment joint 5 moves into groove portion 41 in the tunnel axial direction from the face to the tunnel mouth (one direction (arrow B)) and engages therewith.

[0031] Each of the pair of groove walls 410, 410 has groove wall protrusions 41a, 41a formed to protrude symmetrically toward the inside of the groove 41 (FIG. 7). The surfaces of the groove wall protrusions 41a, 41a facing the inside of the groove 41 are flat. The groove wall protrusions 41a, 41a have a predetermined length and are formed so as to become farther away from the opening 42 as they approach the side wall 43 of the groove 41 (FIGS. 7 and 8).

[0032] The side surfaces of the groove wall protrusions 41a, 41a on the bottom wall 40 side are inclined toward the opposite side of the segment joint surface 20 (opening 42) as they protrude away from each groove wall 410, 410, forming engaged portions 411, 411 (FIG. 7). That is, the groove portion 41 has engaged portions 411, 411 formed as U-shaped inclined surfaces that incline toward the opposite side of the opening 42 as they protrude from each groove wall portion 410, 410 and move away from the groove wall portion 410, 410, with the spacing between them increasing toward the segment joint surface 20.

[0033] Further, the engaged portions 411, 411 are inclined so as to move away from the segment joint surface 20 (opening 42) as they approach the side wall 43 from the end portion that opens into the recess 23a (FIGS. 6 and 8). In this embodiment, the side surfaces of the groove wall protrusions 41a, 41a on the opening 42 side are perpendicular to the groove walls 410, 410.

[0034] The plate-like body of the embedded portion 44 provided in the bottom wall 40 is in the form of a strip of plate and extends in the direction opposite to the opening 42 substantially along the circumferential direction of the tunnel. As shown in Figs. 9 and 10, female-side retaining ridges 45 are formed to protrude from both side surfaces in the thickness direction at the end of embedded portion 44 opposite opening 42.

[0035] The surface of the female side anti-slip protrusion 45 on the segment joint surface 20 side is inclined toward the segment joint surface 20 as it moves away from the thickness direction side of the embedded portion 44, and this inclined surface portion mainly functions as the female side anchor portion 450 that resists tensile forces. The inclined surface portion of this female side retaining ridge 45 corresponds to one inclined surface portion used in the anchor portion of the present invention. In this embodiment, the tunnel radial surface of the female side anti-slip protrusion 45 is a plane parallel to the thickness direction side of the embedded portion 44, and the surface opposite the anchor portion 450 is perpendicular to the thickness direction side of the embedded portion 44.

[0036] As shown in Figure 6, the plate-shaped connecting member 100 used in the male segment joint 5 has a plate-shaped portion 101 whose left side forms a protruding portion 50 that protrudes from the segment joint surface 20 in the tunnel circumferential direction, and is embedded in the segment 2 so that the back surface of the plate-shaped portion 101 faces the face side in the tunnel axial direction and the upper surface faces the inner surface of the segment 2. As a result, the other protrusion portion 103 is exposed to the outside of the segment 2, and the other inclined surface portions 1030, 1030 correspond to the engaged portions 411, 411 of the female segment joint 4 and gradually incline so as to move away from the segment joint surface 20 from the face side toward the well mouth side.

[0037] In addition, the right side of the plate-shaped portion 101 is an embedded portion 54 that is embedded within the segment 2 below the segment joint surface 20, and one of the inclined surface portions 1020, 1020 of one of the protrusion portions 102, 102 provided at the right end portion of the plate-shaped portion 101 mainly functions as a male anchor portion that bites into the concrete and resists tensile force.

[0038] The protrusion 50, which is the left end of the plate-shaped portion 101, moves from the face in the tunnel axial direction toward the tunnel entrance (one direction (arrow B)) after the plate-shaped portion 101 enters toward the recess 23a of the segment 2 (arrow A) and enters the inside of the groove portion 41. Then, as shown in Figures 9 and 10, the engaged portions 411, 411 come into contact with and engage with the other inclined surface portions 1030, 1030 which are the engaging portions, thereby connecting the female segment joint 4 and the male segment joint 5.

[0039] FIG. 11 shows a procedure for connecting segments 2 equipped with female segment joints 4 and male segment joints 5 according to the first embodiment. 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.

[0040] To connect the segments 2, as shown in FIG. 11(a), 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. At this time, the recess 23a adjacent to the female segment joint 4 formed on one joint surface 20a of the segment 2A and the plate-shaped connecting member 100 of the male segment joint 5 formed on the other joint surface 20b of the segment 2B are approximately opposed to each other.

[0041] Next, as shown in Figure 11(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 protrusion 50 of the plate-shaped connecting member 100 of the male segment joint 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.

[0042] Next, as shown in Figure 11 (c), the trailing segment 2B is moved from the face in the tunnel axial direction toward the tunnel entrance (one direction (arrow B)), and the other inclined surface portions 1030, 1030 of the other protrusion portions 103, 103 formed on the left end portion of the plate-shaped portion 101 of the male segment joint 5 become the engaging portions and engage with the engaged portions 411, 411 of the pair of groove wall protrusions 41a, 41a of the female segment joint 4 provided on the leading segment 2A.

[0043] The engaged portions 411, 411 formed to protrude from the groove wall portions 410, 410 come into contact with the other inclined surface portions 1030, 1030 formed to protrude from the side surface of the plate-like portion 101 and serving as the engaging portion. The engaged portions 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 other inclined surface portions 1030, 1030 are inclined toward the embedded portion 54 as they move away from the thickness direction side of the plate-shaped portion 101. In other words, the contact surface between the engaged portions 411, 411 and the other inclined surface portions 1030, 1030 forms a V-shaped inclined surface with the spacing between them increasing toward the segment joint surface 20, which regulates the opening of the groove wall portions 410, 410, so that the female segment joint 4 is less likely to open and the joint strength is improved.

[0044] In addition, since the plate-shaped portion 101 is guided to the central position in the tunnel radial direction of the groove portion 41, the occurrence of gaps at the contact surface between the engaged portions 411, 411 and the other inclined surface portions 1030, 1030 is suppressed, making the female side segment joint 4 less likely to open and stabilizing the joint strength.

[0045] The engaged portions 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 one direction (arrow B), which is the segment insertion direction, i.e., the tunnel axis direction, and the other inclined surface portions 1030, 1030, which are the engaging portions, are formed so as to gradually move away from the embedded portion 54 along one direction, and are formed as an inclined surface that gradually moves away from the segment joint surface 20 along one direction, which is the segment insertion direction.Therefore, by moving the trailing segment 2B in one direction, as the segment 2 is joined along the segment joint surface 20, the plate-shaped portion 101 of the male segment joint 5 is guided toward the bottom wall 40 of the groove portion 41, and the segment joint surfaces 20, 20 are brought into closer contact.

[0046] FIG. 12 shows another example of use of the plate-shaped connecting member 100. In the usage example shown in Figure 12, the top and bottom surfaces of the plate-shaped portion 101 of the plate-shaped connecting member 100 used in the male segment joint 5 are inverted and the right and left ends of the plate-shaped portion 101 are reversed, i.e., the protruding portion 50 and the embedded portion 54 are swapped and the plate-shaped portion 101 is installed on the segment 2.

[0047] Therefore, the other protrusions 103, 103 provided on the left side of the plate-like portion 101 are embedded in the segment 2, and the other inclined surface portions 1030, 1030 serve as anchor portions. In addition, one protrusion portion 102, 102 provided on the right side of the plate-shaped portion 101 protrudes from the segment 2, and one inclined surface portion 1020, 1020 gradually inclines so as to move away from the segment joint surface 20 from the face side toward the mouth side, and serves as an engaging portion that engages with the engaged portion 411, 411 of the female segment joint 4.

[0048] In this way, even if plate-shaped connecting member 100 is turned over and protruding portion 50 and embedded portion 54 are interchanged, there is no change in structure or function, and there is no need to consider the mounting direction of male segment joint 5.

[0049] <Second embodiment> The second embodiment of the present invention will be described below with reference to Figures 13 to 15. Note that a description of the same parts as in the first embodiment will be omitted, and differences will be mainly described. FIG. 13 is a diagram showing a plate-shaped connecting member, FIG. 14 is a diagram showing an example of use of the plate-shaped connecting member, and FIG. 15 is a diagram showing another example of use of the plate-shaped connecting member.

[0050] In the second embodiment, as shown in Figure 13, in a plate-shaped connecting member 100 used in a male side segment joint 5, one side protrusion portions 102, 102 provided on the right side of the plate-shaped portion 101 have one side inclined surface portions 1020, 1020 that incline to the left as they move away from the thickness direction side of the plate-shaped portion 101, and the other side protrusion portions 103, 103 provided on the left side of the plate-shaped portion 101 have other side inclined surface portions 1030, 1030 that incline to the right as they move away from the thickness direction side of the plate-shaped portion 101.

[0051] The horizontal sides L (Figure 13 (e)) of the one inclined surface portion 1020 and the other inclined surface portion 1030 on the top side, and the one inclined surface portion 1020 and the other inclined surface portion 1030 on the bottom side at the same distance h from the top and bottom surfaces (thickness direction side surfaces) of the plate-shaped portion 101 of the one inclined surface portion 1020 and the other inclined surface portion 1030 are parallel to each other and are inclined with respect to the vertical center line c of the plate-shaped portion 101 in a planar view. On the one hand, the inclined surface portions 1020, 1020 are inclined so as to gradually move away from the right end as they move from the rear surface of the plate-shaped portion 101 to the front surface, and the other inclined surface portions 1030, 1030 are inclined so as to gradually move closer to the left end as they move from the rear surface of the plate-shaped portion 101 to the front surface.

[0052] The structure of the female segment joint 4 is similar to that of the first embodiment. In the usage example shown in Figure 14, the plate-shaped connecting member 100 used in the male segment joint 5 is embedded in the segment 2 so that the left side of the plate-shaped portion 101 becomes the protruding portion 50 that protrudes in the tunnel circumferential direction from the segment joint surface 20, the back surface of the plate-shaped portion 101 faces the face side in the tunnel axial direction, and the upper surface faces the inner surface of the segment 2. Then, the other protrusion portion 103 is exposed to the outside of the segment 2 , and the other inclined surface portions 1030 , 1030 which serve as the engaging portions are inclined corresponding to the engaged portions 411 , 411 of the female segment joint 4 .

[0053] The right side of the plate-like portion 101 is the embedded portion 54, which is embedded in the segment 2, and one inclined surface portion 1020, 1020 of one protrusion portion 102, 102 provided at the right end portion of the plate-like portion 101 serves as a male anchor portion that resists tensile force.

[0054] The protruding portion 50 on the left side of the plate-shaped portion 101 enters toward the recessed portion 23a of the segment 2, and then moves from the face in the tunnel axial direction toward the tunnel mouth and enters the inside of the groove portion 41. Then, the engaged portions 411, 411 come into contact with and engage with the other inclined surface portions 1030, 1030 which are the engaging portions, whereby the female segment joint 4 and the male segment joint 5 are connected to each other.

[0055] FIG. 15 shows another example of use of the plate-shaped connecting member 100 according to the second embodiment. In the example of use shown in FIG. 15, the plate-shaped connecting member 100 is provided on the segment 2 with the right and left ends of the plate-shaped portion 101 facing inversely, that is, with the protruding portion 50 and the embedded portion 54 interchanged.

[0056] Therefore, the other protrusions 103, 103 provided on the left side of the plate-like portion 101 are embedded in the segment 2, and the other inclined surface portions 1030, 1030 serve as anchor portions. In addition, one protrusion portion 102, 102 provided on the right side of the plate-shaped portion 101 protrudes from the segment 2, and one inclined surface portion 1020, 1020 gradually inclines so as to move away from the segment joint surface 20 from the face side toward the mouth side, and serves as an engaging portion that engages with the engaged portion 411, 411 of the female segment joint 4.

[0057] In this way, even if plate-shaped connecting member 100 is turned over and protruding portion 50 and embedded portion 54 are interchanged, there is no change in structure or function, and there is no need to consider the mounting direction of male segment joint 5.

[0058] <Third embodiment> Hereinafter, the third embodiment of the present invention will be described with reference to Figures 16 to 21. Note that a description of the same parts as in the first and second embodiments will be omitted, and differences will be mainly described. As shown in FIGS. 16 and 17, in the third embodiment, a plate-shaped connecting member 100 having the same structure as in the first embodiment (FIG. 5) is used as a male segment joint 5. The female segment joint 4 is formed by arranging two plate-like connecting members 100 having the same shape as the male segment joint 5 in parallel with a gap in the thickness direction of the segment 2 .

[0059] The plate-shaped connecting member 100 is symmetrical about the longitudinal center line c and about a plane passing through the thickness center of the plate-shaped portion 101. Therefore, when two plate-shaped connecting members 100 are embedded in a segment 2 with the plate-shaped portions 101 as parallel planes to each other to form a female segment joint 4, the end portion of the plate-shaped portion 101 on the segment joint surface 20 side corresponds to a pair of groove wall portions 410 in the first embodiment, and the portion on the opposite side of the groove wall portions 410 from the segment joint surface 20 corresponds to the embedded portion 44 in the first embodiment. Moreover, the gap at the segment joint surface 20 of the two plate-like portions 101 corresponds to the opening 42 of the groove portion 41 in the first embodiment.

[0060] When arranging the two plate-shaped connecting members 100 in parallel with a gap therebetween in the thickness direction of the segments 2, spacers (not shown) may be used to provide the segments 2.

[0061] Furthermore, of the first protrusions 102, 102 and the second protrusions 103, 103 of the plate-like connecting member 100 constituting the female segment joint 4, the first inclined surface portions 1020, 1020 of the first protrusions 102, 102 or the second inclined surface portions 1030, 1030 of the second protrusions 103, 103 located on the side opposite the segment joint surface 20 become the female anchor portions. On the other hand, the first inclined surface portions 1020, 1020 of the first protrusions 102, 102 or the second inclined surface portions 1030, 1030 of the second protrusions 103, 103 located closer to the segment joint surface 20 and on the inside of the two plate-like portions 101 become the engaged portions.

[0062] When the protrusion 50 of the plate-shaped connecting member 100 used in the male side segment joint 5 is moved in one direction from the recess 23a of the segment 2 and inserted between the two plate-shaped connecting members 100 used in the female side segment joint 4, the one inclined surface portion 1020, 1020 or the other inclined surface portion 1030, 1030, which serves as the engaging portion of the male side segment joint 5, engages with the engaged portion of the female side segment joint 4.

[0063] FIG. 18 shows a first example of use of the plate-shaped connecting member 100 according to the third embodiment. The two plate-shaped connecting members 100 that constitute the female segment joint 4 are embedded in the segment 2 with their left surfaces aligned with the segment joint surface 20, their front surfaces facing the recess 23a (face side) of the segment 2, and their upper surfaces facing the inner surface of the segment 2. As a result, the other inclined surface portions 1030, 1030 of the plate-shaped connecting member 100 used in the female side segment joint 4 become the engaged portion, and gradually incline so as to move away from the segment joining surface 20 as they move away from the recess 23a, and the one-side inclined surface portions 1020, 1020 become the female side anchor portion.

[0064] The plate-shaped connecting member 100 used in the male segment joint 5 is embedded in the segment 2 so that the left side of the plate-shaped portion 101 becomes the protrusion 50 that protrudes in the tunnel circumferential direction from the segment joint surface 20, and the back surface of the plate-shaped portion 101 faces the face side and the upper surface faces the inner surface of the segment 2. As a result, the other inclined surface portions 1030, 1030 of the male segment joint 5 become the engagement portion and gradually incline away from the segment joint surface 20 from the face side toward the wellhead side, and one inclined surface portions 1020, 1020 become the male anchor portion.

[0065] FIG. 19 shows a second example of use of the plate-shaped connecting member 100 according to the third embodiment. In this use example, the female segment joint 4 has a structure similar to that of the first use example shown in FIG.

[0066] The plate-shaped connecting member 100 used in the male segment joint 5 is attached to the segment 2 by inverting the top and bottom surfaces of the plate-shaped portion 101 so that the bottom surface faces the inner surface of the segment 2 and reversing the right and left ends of the plate-shaped portion 101. As a result, the other protruding portions 103, 103 of the plate-like connecting member 100 are embedded in the segment 2, and the other inclined surface portions 1030, 1030 serve as male anchor portions. In addition, one of the protrusion portions 102, 102 protrudes from the segment 2, and one of the inclined surface portions 1020, 1020 gradually inclines away from the segment joint surface 20 from the face side toward the mouth side, and serves as an engaging portion that engages with the other inclined surface portion 1030, 1030, which is the engaged portion of the female segment joint 4.

[0067] FIG. 20 shows a third example of use of the plate-shaped connecting member 100 according to the third embodiment. In the use example shown in FIG. 20, the structure of the plate-shaped connecting member 100 used in the male segment joint 5 is similar to the first use example shown in FIG.

[0068] The two plate-shaped connecting members 100 that make up the female segment joint 4 are embedded in the segment 2 with the top and bottom surfaces of the plate-shaped parts 101 inverted, the right surface aligned with the segment joint surface 20, the left end facing away from the segment joint surface 20, and the front facing the face side. Then, the other inclined surface portions 1030, 1030 of the other protrusion portions 103, 103 provided on the left end portion of the plate-like portion 101 become the female anchor portion.

[0069] In addition, one inclined surface portion 1020, 1020 of one protrusion portion 102, 102 provided at the right end portion of the plate-shaped portion 101 becomes the engaged portion, and gradually inclines so as to move away from the segment joint surface 20 from the face side toward the well mouth side.

[0070] FIG. 21 shows a fourth example of use of the plate-shaped connecting member 100 according to the third embodiment. In the use example shown in FIG. 21, the female side segment joint 4 has a structure similar to that of the female side segment joint 4 in the third use example shown in FIG. Moreover, male side segment joint 5 has a structure similar to that of male side segment joint 5 in the second usage example shown in FIG.

[0071] Therefore, the other inclined surface portions 1030, 1030 of the two plate-shaped connecting members 100 constituting the female side segment joint 4 become the male side anchor portion, and the one inclined surface portions 1020, 1020 become the engaged portion. In addition, the other inclined surface portions 1030, 1030 of the plate-shaped connecting member 100 used in the male side segment joint 5 serve as the male side anchor portion, and the one inclined surface portions 1020, 1020 gradually incline so as to move away from the segment joint surface 20 from the face side toward the well mouth side, and serve as an engaging portion that engages with the engaged portion (the other inclined surface portions 1030, 1030) of the female side segment joint 4.

[0072] In the third embodiment, the segment joint 3 is constructed using three plate-like connecting members 100 of the same shape, so there is no need to manufacture many different types of parts, and costs can be kept low.

[0073] In this embodiment, the one inclined surface portions 1020, 1020 or the other inclined surface portions 1030, 1030 on the opposite side (outside the C-joint) to the one inclined surface portions 1020, 1020 or the other inclined surface portions 1030, 1030 on the groove portion 41 side that form the engaged portions 411 of the two plate-like connecting members 100 of the female side segment joint 4 are embedded in the concrete of the segment 2 and also function as an anchor portion. The one inclined surface portions 1020, 1020 or the other inclined surface portions 1030, 1030 of this anchor portion can prevent the groove wall portion 410 from peeling off from the concrete.

[0074] <Fourth embodiment> Hereinafter, the fourth embodiment of the present invention will be described with reference to Figures 22 to 25. Note that a description of the same parts as in the first to third embodiments will be omitted, and the following mainly describes the different parts.

[0075] In the fourth embodiment, similarly to the third embodiment, the segment joint 3 is formed using three plate-shaped connecting members 100 of the same shape. The two plate-shaped connecting members 100 used in the female segment joint 4 and the one plate-shaped connecting member 100 used in the male segment joint 5 have the same structure as the plate-shaped connecting member 100 in the second embodiment. In other words, the horizontal sides L of one inclined surface portion 1020, 1020 and the other inclined surface portion 1030, 1030 at the same distance h from the top and bottom surfaces (thickness-wise side surfaces) of the plate-like portion 101 of one inclined surface portion 1020 and the other inclined surface portion 1030 are parallel to each other and are inclined in a planar view with respect to the vertical center line c of the plate-like portion 101 (Figure 13).

[0076] FIG. 22 shows a first example of use of the plate-shaped connecting member 100 in the fourth embodiment. In the usage example shown in Figure 22, the plate-shaped connecting member 100 used in the male segment joint 5 is embedded in the segment 2 so that the left side of the plate-shaped portion 101 becomes the protrusion 50 that protrudes in the tunnel circumferential direction from the segment joint surface 20, the back surface of the plate-shaped portion 101 faces the face side, and the upper surface faces the inner surface of the segment 2.

[0077] Then, the other protrusion portion 103 is exposed to the outside of the segment 2, and the other inclined surface portions 1030, 1030 gradually incline away from the segment joint surface 20 from the face side toward the well mouth side to form an engagement portion. Moreover, one protrusion portion 102 is embedded in the segment 2, and one inclined surface portions 1020, 1020 serve as a male anchor portion.

[0078] The two plate-shaped connecting members 100 used in the female segment joint 4 are embedded in the segment 2 so that the right face of the plate-shaped portion 101 coincides with the segment joint surface 20, the left end faces the opposite side to the segment joint surface 20, the upper face faces the inner surface of the segment 2, and the back face faces the face side. Therefore, the other inclined surface portions 1030, 1030 of the two plate-shaped connecting members 100 become the female anchor portions, and the one inclined surface portions 1020, 1020 disposed between the two plate-shaped portions 101 become the engaged portions.

[0079] FIG. 23 shows a second example of use of the plate-shaped connecting member 100 in the fourth embodiment. In the use example shown in FIG. 23, the structure of the female side segment joint 4 is similar to that of the female side segment joint 4 in the first use example shown in FIG.

[0080] The plate-shaped connecting member 100 used in the male segment joint 5 is embedded in the segment 2 with the upper surface of the plate-shaped portion 101 facing the inner surface of the segment 2, the front surface facing the face side, and the right end portion protruding from the segment joint surface 20. That is, the plate-shaped connecting member 100 of the male segment joint 5 is attached to the segment 2 with the left and right reversed to the plate-shaped connecting member 100 of the first usage example shown in FIG.

[0081] Then, the other inclined surface portion 1030, 1030 of the plate-shaped connecting member 100 is embedded in the segment 2 and becomes the male anchor portion, and the one inclined surface portion 1020, 1020 exposed to the outside of the segment 2 inclines so as to move away from the segment joint surface 20 as it moves from the face side to the well mouth side, and becomes an engaging portion that engages with the engaged portion of the female segment joint 4.

[0082] FIG. 24 shows a third example of use of the plate-shaped connecting member 100 in the fourth embodiment. In the use example shown in FIG. 24, the plate-shaped connecting member 100 used in the male segment joint 5 is attached to the segment 2 in the same manner as in the first use example shown in FIG.

[0083] The two plate-shaped connecting members 100 used in the female segment joint 4 are provided on the segment 2 with the left and right reversed to the first use example shown in FIG. That is, the left surface of the plate-shaped portion 101 coincides with the segment joint surface 20, the right end surface faces away from the segment joint surface 20, the top surface faces the inner peripheral surface of the segment 2, and the front surface faces the face.

[0084] Therefore, one of the inclined surface portions 1020, 1020 of the two plate-shaped connecting members 100 becomes the female anchor portion, and the other inclined surface portions 1030, 1030 arranged between the two plate-shaped portions 101 gradually incline so as to move away from the segment joint surface 20 from the face side toward the well mouth side, and become the engaged portion that engages with the engaging portion of the male segment joint 5.

[0085] FIG. 25 shows a fourth example of use of the plate-shaped connecting member 100 in the fourth embodiment. In the use example shown in FIG. 25, the two plate-shaped connecting members 100 used in the female side segment joint 4 are embedded in the segments 2 in the same manner as in the third use example shown in FIG. One of the inclined surface portions 1020, 1020 of the two plate-shaped connecting members 100 becomes the female anchor portion, and the other inclined surface portions 1030, 1030 arranged between the two plate-shaped portions 101 gradually incline away from the segment joint surface 20 from the face side toward the well mouth side and become the engaged portion.

[0086] Moreover, the plate-shaped connecting member 100 used in the male segment joint 5 is attached to the segment 2 in the same manner as in the second use example shown in FIG. The other inclined surface portion 1030, 1030 of the plate-shaped connecting member 100 is embedded in the segment 2 and serves as a male anchor portion, and one inclined surface portion 1020, 1020 exposed to the outside of the segment 2 inclines so as to move away from the segment joint surface 20 as it moves from the face side to the well mouth side, and serves as an engaging portion that engages with the engaged portion of the female segment joint 4.

[0087] <Fifth embodiment> Hereinafter, the fifth embodiment of the present invention will be described with reference to Figures 26 and 27. 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.

[0088] The fifth embodiment has a structure substantially similar to that of the third and fourth embodiments, but further improves the opening resistance strength of the female segment joint 4. This point will be described. FIG. 26 is a perspective view of a segment joint, and FIG. 27 is a cross-sectional view of the segment joint.

[0089] In the fifth embodiment, the plate-shaped portions 101 of two plate-shaped connecting members 100 used in a female side segment joint 4 are connected between one protrusion portion 102, 102 and the other protrusion portion 103, 103 via a columnar connector 47, and the protrusion portion 50 of the plate-shaped portion 101 of the plate-shaped connecting member 100 used in a male side segment joint 5 is inserted between the two opposing plate-shaped portions 101, in the portion closer to the segment joint surface 20 than the connector 47. In addition, the portion where the protrusions 50 of the two plate-shaped portions 101 are inserted is connected on the surface opposite the recess 23a of the segment 2 via a side wall 43' which corresponds to the side wall 43 in the first and second embodiments.

[0090] Since the plate-shaped portions 101 of the two plate-shaped connecting members 100 are connected by the connector 47 and the side wall 43', the effect of preventing the female side segment joint 4 from opening is enhanced rather than merely the opening-inhibiting effect due to the engagement between the engaging portion of the male side segment joint 5 and the engaged portion of the female side segment joint 4, and the segments 2 are joined stably.

[0091] [Other Modifications] The present invention is not limited to the above-mentioned embodiment, and may also include the following, for example.

[0092] In this embodiment, the present invention is adopted in a segment joint that connects adjacent segment pieces 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. In addition, the present invention is not limited to a case where the joint is engaged by moving in the tunnel axial direction, but may be applied to a case where the joint is engaged by moving in the tunnel radial direction, for example. In this case, the tunnel radial direction corresponds to one direction in the present invention.

[0093] In the fifth embodiment, the plate-like portions of the two female side components are connected via a columnar connector, but they may also be connected by a wall-shaped connector.

[0094] Each technical matter in any embodiment may be applied to another embodiment to serve as an example. [Explanation of symbols]

[0095] 1. Shield Tunnel 2 Segments 20 Segment joint surface 20a One of the joint surfaces 20b The other joint surface 21 Segment Ring 22 Ring-to-ring joint 23a Recess 3 Segment Joint 4 Female segment fitting 40 Bottom Wall 41 Groove 410 Groove wall 411 Engaged part 41a Groove wall protrusion 42 Opening on the segment joint surface side 43,43' side wall 44 Buried section 45 Female side retaining ridge 450 Female anchor part 47 Connectors 5 Male segment joint 50 Protrusion 54 Buried section 100 Plate-shaped connecting member 101 Plate-shaped part 102 One-sided protrusion 1020 One slope part 103 Other protrusion 1030 Other inclined surface part

Claims

1. A plate-shaped connecting member for use in a segment joint having an engagement portion for engaging with another segment joint and an anchor portion embedded in the segment, The plate-shaped connecting member is A plate-like portion that extends in a vertical direction and a horizontal direction, has a thickness in a thickness direction, and has a vertical one end portion that is one end portion in the vertical direction, and a vertical other end portion that is the other end portion in the vertical direction; a pair of first protrusions each protruding from a thickness direction side surface of the first end portion of the plate-like portion in the longitudinal direction facing each other in the thickness direction, the one protrusion portion has a one inclined surface portion that faces toward the other end portion in the longitudinal direction and inclines toward the other end portion in the longitudinal direction as it moves away from the thickness direction side surface of the plate-like portion, The one inclined surface portion is used for the anchor portion. A plate-shaped connecting member characterized by:

2. A plate-shaped connecting member for use in a segment joint having an engagement portion for engaging with another segment joint and an anchor portion embedded in the segment, The plate-shaped connecting member is A plate-like portion that extends in the vertical and horizontal directions and has a thickness in the thickness direction; a pair of first protrusions each protruding from a thickness direction side surface of a first end portion of the plate-like portion in the thickness direction, the first end portion being one end portion of the plate-like portion in the thickness direction, the first end portion being one end portion of the plate-like portion in the thickness direction; a pair of other protrusions each protruding from a thickness direction side surface facing each other in the thickness direction of the other longitudinal end portion of the plate-like portion in the longitudinal direction, the one protrusion portion has a one inclined surface portion that faces toward the other end portion in the longitudinal direction and inclines toward the other end portion in the longitudinal direction as it moves away from the thickness direction side surface of the plate-like portion, the other protrusion portion has a other inclined surface portion that faces toward the one end portion in the longitudinal direction and inclines toward the one end portion in the longitudinal direction as it moves away from the thickness direction side surface of the plate-like portion, Either the one inclined surface portion or the other inclined surface portion is used as the engagement portion, and the other is used as the anchor portion. A plate-shaped connecting member characterized by:

3. The one inclined surface portion and the other inclined surface portion are in a positional relationship in which the horizontal sides at the same distance from the thickness direction side surface of the one inclined surface portion and the other inclined surface portion are symmetrical with respect to the vertical center line of the plate-shaped portion.

3. The plate-like connecting member according to claim 2.

4. The one inclined surface portion and the other inclined surface portion have their lateral sides parallel to each other at the same distance from the thickness direction side surface of the one inclined surface portion and the other inclined surface portion.

3. The plate-like connecting member according to claim 2.

5. A segment joint using the plate-shaped connecting member according to any one of claims 2 to 4, One of the plate-shaped connecting members is used as a male segment joint, Two of the plate-like connecting members are arranged so that the first protrusions or the second protrusions face each other to be used as a female segment joint; Either one of the one inclined surface portion and the other inclined surface portion of the male segment joint and either one of the one inclined surface portion and the other inclined surface portion of the female segment joint engage with each other to form the engagement portion. A segment joint comprising:

Images