Segment joint and segment joint embedded segment structure

Abstract

To provide a segment joint that has a simple structure capable of being easily processed, is strongly fixed to a segment, and improves connection strength of the segment.SOLUTION: A segment joint 3 comprises: a coupling part to be coupled with other segment joint; anchor parts 44, 54 embedded in a segment 2; and a plate-like body. The plate-like body comprises: twisted parts 440, 540 formed by rotating a part of the plate-like body on opposite side of the plate-like body around an axis along a drawing direction of the plate-like body; and thorough holes 441, 541 that are provided on the twisted parts 440, 540 and allow a reinforcement bar to penetrate. The twisted parts 440, 540 are the anchor parts 44, 54.SELECTED DRAWING: Figure 6

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] A known segment joint structure is one in which, for both segments to be joined, a joint has a wedge portion provided on a web portion fixed to the joint surface of one of the segments, with this wedge portion exposed in a recess provided in the segment, and a joint has a wedge portion provided on a web portion protruding from the joint surface of the other segment, and the wedge portion protruding from the segment joint surface engages with the wedge portion exposed in the recess to connect the joints together, thereby joining the segments in each segment (Patent Document 1).

[0003] In order to withstand forces that try to pull the joint out of the segment, the joint structure described in Patent Document 1 has through holes formed in the parts of the web where the segments are embedded, and shear resistance is exerted by the concrete filled in these through holes, with reinforcing bars being placed to pass through the through holes to further increase the shear resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-104278 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the segment joint structure described in Patent Document 1 above, the web of the joint is flat and approximately parallel to the direction along the peripheral surface of the segment. Therefore, if one attempts to extend the reinforcing bar passed through the through hole formed in the web in a straight line, it will extend in the thickness direction of the segment, and the length of the reinforcing bar cannot be made longer than the thickness of the segment. On the other hand, if straight reinforcing bars are to be arranged in a direction along the circumferential surface of the segment, a separate component such as a protrusion must be provided to attach the reinforcing bars to the flat web of the joint, which complicates the structure and increases processing effort and cost.

[0006] The problem that the present invention aims to solve is to provide a segment joint and a segment embedding structure for a segment joint that have a simple structure and are easy to process, are firmly fixed to the segments to provide high pull-out resistance, and increase the joining strength of the segments. [Means for solving the problem]

[0007] The invention according to claim 1 of the present application is a segment joint comprising a connecting part for connecting to other segment joints, an anchor part embedded in a segment, and a plate-shaped body, wherein the plate-shaped body comprises a twisted part formed by rotating the side of the plate-shaped body opposite the connecting part about an axis along the extension direction of the plate-shaped body, and a through hole provided in the twisted part and through which a reinforcing bar can be passed, and the twisted part is the anchor part.

[0008] The invention of claim 2 of the present application is a segment joint as described in claim 1, characterized in that the twisted portion is formed by rotating the side of the plate-like body opposite the connecting portion by 90 degrees around an axis along the extension direction of the plate-like body.

[0009] The invention of claim 3 of the present application is a segment joint as described in claim 1, characterized in that the opposite side of the connecting portion of the plate-like body is divided into a plurality of small pieces along the extension direction of the plate-like body, and the plurality of small pieces have the twisted portion and the through hole.

[0010] The invention of claim 4 of the present application is a segment joint as described in claim 3, characterized in that the twisted portion is formed by rotating the side of the plate-like body opposite the connecting portion by 90 degrees around an axis along the extension direction of the plate-like body.

[0011] The invention according to claim 5 of the present application is the segment joint according to claim 3, characterized in that the twisted portions of the multiple strips are formed by being rotated at the same angle.

[0012] The invention according to claim 6 of the present application is the segment joint according to claim 3, characterized in that the twisted portions of the multiple strips are formed by being rotated at different angles.

[0013] The invention according to claim 7 of the present application is a segment embedding structure of a segment joint comprising a connecting portion for connecting to another segment joint, an anchor portion embedded in a segment, and a plate-shaped body, wherein the plate-shaped body comprises a twisted portion formed by rotating the opposite side of the connecting portion of the plate-shaped body around an axis along the extension direction of the plate-shaped body, and a through hole provided in the twisted portion and capable of passing a reinforcing bar therethrough, wherein the non-rotated portion of the twisted portion is provided along the circumferential surface of the segment, and the most rotated portion of the twisted portion is provided along a direction intersecting the direction along the circumferential surface of the segment, and the reinforcing bar is disposed to pass through the through hole.

[0014] The invention of claim 8 of the present application is the segment embedding structure of the segment joint described in claim 7, characterized in that the part of the twisted portion that rotates the most is provided along a direction perpendicular to the direction along the circumferential surface of the segment, and the reinforcing bar is arranged in the through hole by penetrating in the direction along the circumferential surface of the segment. Effect of the Invention

[0015] According to the present invention, the twisted portion serves as an anchor portion, thereby further improving the pull-out resistance. Furthermore, even if the plate-shaped portion is arranged along the peripheral surface of the segment and linear reinforcing material (e.g., steel bar) is inserted through the through hole, the through hole of the twisted portion will be arranged in a direction along the peripheral surface of the segment, so that the length of the reinforcing material can be made longer than the thickness of the segment, and the segment's reinforcement bars can be inserted through the through holes. Furthermore, since it is only necessary to provide the through holes in the plate-like portion, processing is easy.

[0016] In addition, by dividing the plate-shaped portion into multiple small pieces and rotating the multiple small pieces to form multiple twisted portions, the height of the twisted portions can be kept low, ensuring a sufficient concrete covering thickness for the segment joints.

[0017] In addition, if a plurality of strips are rotated at the same angle, it is easy to process the strips to form the twisted portion.

[0018] In addition, by rotating the multiple strips at different angles, the inclination angles of the multiple twisted sections and the extension directions of the multiple rebars that pass through each twisted section are different, making it possible to resist forces acting in different directions between the joined segments. [Brief description of the drawings]

[0019] [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] 1 is an enlarged view of a main portion of one side connector and another side connector of a segment joint in a plan view of a segment according to a first embodiment of the present invention, viewed from the tunnel center side. FIG. [Diagram 5] 5A and 5B show one side connectors and another side connectors 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] FIG. 1 is a perspective view of a segment joint showing a first embodiment of the present invention. [Figure 7] FIG. 1 is a side view of a segment joint showing a first embodiment of the present invention. [Figure 8] 5A to 5C are diagrams illustrating a procedure for connecting segment joints of segments according to the first embodiment of the present invention. [Figure 9] FIG. 4 is a perspective view of a segment joint showing a second embodiment of the present invention. [Figure 10] FIG. 11 is a plan view of an anchor portion according to a second embodiment of the present invention before a twisted portion is formed. [Figure 11] FIG. 4 is a side view of a segment joint showing a second embodiment of the present invention. [Figure 12] FIG. 11 is a perspective view of a segment joint showing a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] 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 circumferential direction of a tunnel in a shield tunnel. The segment joint and a segment embedding structure in which the segment joint is embedded in a segment will be described below.

[0021] <First embodiment> A first embodiment of the present invention will be described with reference to FIGS. 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 one side connectors and other side connectors of a segment joint in the plan view of the segment viewed from the tunnel center side, Figure 5 shows one side connectors and other side connectors of a segment joint, Figure 5(a) is a side view, Figure 5(b) is a plan view, Figure 6 is an oblique view of the segment joint, Figure 7 is a side view of the segment joint, and Figure 8 is a diagram showing the procedure for connecting the segment joints of the segments.

[0022] 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 made of reinforced concrete in the circumferential direction of the tunnel on the face side of the existing segment ring 21.

[0023] 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.

[0024] The segment joint 3 (inter-piece joint) that connects adjacent segments 2 in the tunnel circumferential direction has a one-side connector 4 and an other-side connector 5, made of, for example, steel, respectively installed on the segment joint surfaces 20, which are both end surfaces of the segment 2 in the tunnel circumferential direction. Two one-side connectors 4 are provided on one joint surface 20a along the tunnel axis direction, and two other-side connectors 5 are provided on the other joint surface 20b along the tunnel axis direction.

[0025] As shown in FIGS. 4 and 5, the one-side connector 4 and the other-side connector 5 are provided with anchor portions 44, 54 to be embedded in the concrete constituting the segment 2, respectively.

[0026] A recess 23a is provided in one joint surface 20a, and one-side connector 4 is embedded adjacent to it in the tunnel axial direction. The end of one-side connector 4 is provided flush with one joint surface 20a. The end of one-side connector 4 may be embedded from one joint surface 20a. The other side connector 5 is provided on the segment 2, protruding from the other joint surface 20b.

[0027] As shown in Figure 5, the one-side connector 4 has a groove portion 41 including a bottom wall 40, a pair of groove wall portions 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 mouth in the tunnel axial direction (arrow B)), which corresponds to the connecting portion of the present invention. The pair of groove walls 410, 410 are formed in parallel from an opening 42 on the segment joint surface 20 side to the bottom wall 40 along the approximate circumferential direction of the tunnel. The bottom wall 40 is provided with an anchor portion 44 extending in the direction opposite to the segment joint surface 20 .

[0028] The end of the groove 41 on the face side in the tunnel axis direction opens into the recess 23a, and the end on the tunnel mouth side (one-way end side) is closed by a side wall 43 (Figure 5 (b)). On each of the pair of groove walls 410, 410, groove wall protrusions 41a, 41a are formed so as to protrude symmetrically toward the inside of the groove 41 (FIG. 5(a)). The groove 41 and the groove wall protrusions 41a, 41a form one-side engagement portion .

[0029] The surfaces of the groove wall protrusions 41a, 41a facing the inside of the groove 41 are flat. The groove wall protrusions 41 a, 41 a are inclined with respect to the tunnel axial direction, and are formed so as to become farther away from the opening 42 as they approach the side wall 43 of the groove 41 .

[0030] The side of the groove wall protrusions 41a, 41a on the bottom wall 40 side is shaped to slope toward the opposite side of the segment joint surface 20 (opening 42) as it protrudes away from each groove wall 410, 410, forming engaged surfaces 411, 411 (Figure 5(a)). That is, the groove portion 41 has engaged surfaces 411, 411 that are 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 opening 42, with the spacing between them increasing toward the segment joint surface 20.

[0031] As shown in FIG. 5(b), the engaged surfaces 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. 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.

[0032] 6 and 7, the anchor portion 44 provided on the bottom wall 40 is formed of a band-shaped flat plate along the peripheral surface of the segment 2 and extends substantially along the circumferential direction of the tunnel in the opposite direction to the segment joint surface 20. This band-shaped flat plate corresponds to the plate-shaped body of the present invention.

[0033] The anchor portion 44 (plate-shaped body) is rotated on the side opposite to the connecting portion side of the anchor portion 44 around an axis along the extending direction of the anchor portion 44 to form a twisted portion 440. Specifically, the end of the anchor portion 44 opposite the segment joint surface 20 is rotated 90 degrees around the central axis of the anchor portion 44 along the extension direction of the anchor portion 44 (the circumferential direction of the segment 2), forming a twisted portion 440.

[0034] In other words, the non-rotating portion of twisting section 440 (including the portion where twisting begins) is provided along the circumferential surface of segment 2, and the most rotated portion of twisting section 440 (including the portion where twisting ends) is provided along a direction that intersects with the direction along the circumferential surface of segment 2 (specifically, a direction perpendicular to the direction). The end of the twisted portion 440 (the part that is rotated the most (including the part where the twisting ends)) stands up along the thickness direction of the segment 2.

[0035] Further, a through hole 441 is formed at the end of the twisted portion 440 opposite to the joint surface 20a, and a reinforcing bar 442 for preventing pull-out can be inserted into the through hole 441. The reinforcing bar 442 corresponds to the reinforcing bar of the present invention. The reinforcing bar 442 is anchored in the concrete that constitutes the segment 2 and resists the force that tries to pull out the one-side connector 4.

[0036] The straight reinforcing bar 442 that passes through the through hole 441 of the twisted portion 440 that stands in the thickness direction of the segment 2 extends perpendicular to the thickness direction of the segment 2, i.e., is arranged to pass through in a direction along the peripheral surface of the segment 2. Therefore, the length can be made longer than when the reinforcing bar is arranged along the thickness direction, and a large resistance to pull-out force can be obtained. In addition, reinforcement bars, such as reinforcing bars, to be arranged in the segment 2 can be passed through the through holes 441.

[0037] 5, the other-side connector 5 has a plate-like portion 50 whose tip portion protrudes from the segment joint surface 20 in the tunnel circumferential direction and moves from the tunnel face in the tunnel axial direction toward the tunnel mouth (one direction (arrow B)) to be inserted into the groove portion 41. This plate-like portion 50 corresponds to the plate-like body of the present invention.

[0038] The base end of the plate-like portion 50 is an anchor portion 54 that is embedded in the segment 2 . That is, the plate-shaped portion 50 is integrally configured to include a protruding portion 51 that protrudes beyond the segment joint surface 20 and an anchor portion 54 that extends from the protruding portion 51 in the opposite direction to the segment joint surface 20. The protruding portion 51 corresponds to the connecting portion of the present invention.

[0039] As shown in FIGS. 6 and 7, the plate-like portion 50 is formed of a band-like flat plate that fits along the peripheral surface of the segment 2.

[0040] The anchor portion 54 of the plate-shaped portion 50 is rotated on the side opposite to the connecting portion side of the anchor portion 54 around an axis along the extending direction of the anchor portion 54 to form a twisted portion 540 . Specifically, the end of anchor portion 54 opposite segment joint surface 20 is rotated 90 degrees around the central axis of anchor portion 54 along the extension direction of anchor portion 54 (circumferential direction of segment 2), forming twisted portion 540.

[0041] In other words, the non-rotating portion of twisting section 540 (including the portion where twisting begins) is provided along the circumferential surface of segment 2, and the most rotated portion of twisting section 540 (including the portion where twisting ends) is provided along a direction that intersects with the direction along the circumferential surface of segment 2 (specifically, a direction perpendicular to the direction). The end of the twisted portion 540 (the part that is rotated the most (including the part where the twisting ends)) stands up along the thickness direction of the segment 2.

[0042] Further, a through hole 541 is formed at the end of the twisted portion 540 opposite to the joint surface 20b, and a reinforcing bar 542 for preventing pull-out can be inserted into the through hole 541. The reinforcing bar 542 corresponds to the reinforcing bar of the present invention. The reinforcing bar 542 is anchored in the concrete that constitutes the segment 2 and resists the force that tries to pull out the other side connector 5 .

[0043] The straight reinforcing bar 542 that passes through the through hole 541 of the twisted portion 540 that stands in the thickness direction of the segment 2 extends perpendicular to the thickness direction of the segment 2, i.e., is arranged to pass through in a direction along the peripheral surface of the segment 2. Therefore, the length can be made longer than when the reinforcing bar is arranged along the thickness direction, and large resistance to pull-out force can be obtained. In addition, reinforcing bars, such as reinforcing bars, to be arranged in the segment 2 can be passed through the through holes 541.

[0044] Plate-shaped protrusions 51a, 51a are formed on both side surfaces of the protrusion 51 in the radial direction of the tunnel so as to protrude symmetrically toward the pair of groove walls 410, 410, respectively (FIG. 5(a)). The protrusion 51 and the plate-shaped portion ridges 51a, 51a constitute an other-side engagement portion 58 that engages with the one-side engagement portion 48. The anchor portion 54 extends from the other-side engagement portion 58 in the opposite direction to the segment joint surface 20. In this embodiment, the extension direction of the anchor portion 54 is the circumferential direction of the segment 2.

[0045] The plate-shaped protrusions 51a, 51a are inclined with respect to the tunnel axial direction and are formed so as to become farther away from the segment joint surface 20 as they approach from the face side to the portal side in the tunnel axial direction (FIG. 5(b)). The side surfaces of the plate-shaped portion protrusions 51a, 51a on the anchor portion 54 side are inclined toward the anchor portion 54 as they move away from the side surface of the plate-shaped portion 50, forming engagement surfaces 511, 511 (FIG. 5(a)). That is, the plate-shaped portion 50 has engagement surfaces 511, 511 that are formed as U-shaped inclined surfaces that protrude from the side of the plate-shaped portion 50 and incline toward the anchor portion 54 as they move away from the side of the plate-shaped portion 50, with the spacing between them increasing toward the segment joint surface 20.

[0046] Also, as shown in Figures 4 and 5(b), the engaging surfaces 511, 511 are inclined at an angle corresponding to the engaged surfaces 411, 411 of the one-side connector 4 so as to gradually move away from the segment joint surface 20 from the face side toward the tunnel mouth side in the tunnel axial direction.

[0047] Then, as shown in Figures 5(b), 6 and 7, the protrusion 51 enters (arrow A) toward the recess 23a of the segment 2 installed previously in the tunnel circumferential direction, and then moves from the face in the tunnel axial direction toward the tunnel mouth (one direction (arrow B)) and enters the inside of the groove portion 41, whereby the engaged surfaces 411, 411 come into contact with the engaging surfaces 511, 511, engaging the one-side engaging portion 48 of the one-side connector 4 and the other-side engaging portion 58 of the other-side connector 5.

[0048] FIG. 8 shows a procedure for connecting the segments 2 having the one-side connector 4 and the other-side connector 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.

[0049] To connect the segments 2, as shown in FIG. 8(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 one-side connector 4 formed on the joint surface 20a of the segment 2A and the protrusion 51 of the other-side connector 5 formed on the joint surface 20b of the segment 2B substantially face each other.

[0050] 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 protrusion 51 of the other-side 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.

[0051] Next, as shown in Figure 8 (c), the trailing segment 2B is moved from the face in the tunnel axis direction toward the tunnel entrance (one direction (arrow B)), and the engagement surfaces 511, 511 of the protrusion 51 of the other-side connector 5 provided on segment 2B are engaged with and connected to the engagement surfaces 511, 511 of a pair of groove wall portions 410, 410 of the one-side connector 4 provided on the leading segment 2A.

[0052] Engaged surfaces 411, 411 formed to protrude from the groove walls 410, 410 and engage with the protruding portion 51, and engaging surfaces 511, 511 formed to protrude from the side surface of the protruding portion 51 engage with each other. The 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 engaging surfaces 511,511 are inclined toward the anchor portion 54 as they move away from the side surface of the plate-shaped portion 50. In other words, the engagement portion between the engaged surfaces 411,411 and the engaging surfaces 511,511 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 one-side connector 4 is less likely to open and the joint strength is improved.

[0053] In addition, since the protrusion 51 is guided to the central position of the groove 41 in the tunnel radial direction, the occurrence of gaps in the interlocking of the engaging portions is suppressed, making the one-side connector 4 less likely to open and stabilizing the joint strength.

[0054] The 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 one direction (arrow B), which is the segment insertion direction, i.e., the tunnel axial direction, and the engaging surfaces 511, 511 are formed so as to gradually move away from the anchor 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.As the segment 2 is joined along the segment joint surface 20, the protrusion 51 of the other-side connector 5 is guided toward the bottom wall 40 of the groove portion 41, and the segment joint surfaces 20, 20 become more closely attached.

[0055] The segment joint 3 not only has a one-side connector 4 that is difficult to open, but also has a one-side connector 4 and an other-side connector 5 through which the reinforcing bars 442, 542, which have few length restrictions, have a high resistance to being pulled out, thereby increasing the joining strength of the segment 2.

[0056] <Second embodiment> The second embodiment of the present invention will be described below with reference to Figures 9 to 11. Note that a description of the same parts as in the first embodiment will be omitted, and differences will be mainly described.

[0057] FIG. 9 is a perspective view of the segment joint, FIG. 10 is a plan view of the anchor portion before twisting, and FIG. 11 is a side view of the segment joint.

[0058] As shown in FIG. 9, in the second embodiment, the side of the plate-like body opposite the connecting portion is divided into a plurality of small pieces along the extending direction of the plate-like body, and the plurality of small pieces have twisted portions and through holes. The side of the anchor portions 44, 54 (plate-shaped bodies) opposite the segment joint surface 20 (opposite the connecting portion) is divided into multiple (two in this embodiment) strips 443, 543 along the extension direction of the anchor portions 44, 54 (circumferential direction of the segment 2).

[0059] As shown in Fig. 10, the plate-like body is divided by drawing a cutting line K from the end of the anchor portions 44, 54. The through holes are not shown in the figure. The through holes may be formed before or after division, or may be formed after the twisted portion is formed.

[0060] The strips 443, 543 are all rotated 90 degrees around an axis along the extension direction of the anchor portions 44, 54 (the circumferential direction of the segment 2) to form twisted portions 440, 540. The twisted portions 440, 540 stand up along the thickness direction of the segment 2.

[0061] At the ends of the twisted portions 440, 540 opposite the segment joint surface 20, through holes 441, 541 are formed at corresponding positions. The two twisted portions 440, 540 of the one-side connector 4 and the other-side connector 5, respectively, are formed by being rotated at the same angle (90 degrees in this embodiment), and through holes 441, 541 are formed at the same positions in each.

[0062] A straight reinforcing bar 442, 542 extending perpendicular to the thickness direction of the segment 2 is inserted into through holes 441, 541 formed in two twisted portions 440, 540 of the one-side connector 4 and the other-side connector 5, respectively.

[0063] In the second embodiment, in addition to improving the joint strength of the segment 2 as in the first embodiment, the height of the twisted portions 440, 540 is reduced, so that a sufficient thickness of concrete can be secured to cover the anchor portions 44, 54 of the segment joint 3. Furthermore, since a single reinforcing bar 442, 542 is arranged to pass through the through holes 441, 541 of the twisted portions 440, 540 of the strips 443, 543 which are divided into multiple pieces (two in this embodiment), when a tensile force acts on the anchor portions 44, 54, the stress concentrated near the through holes 441, 541 can be dispersed, and deformation (elongation) can be suppressed. Furthermore, when a tensile force acts on the anchor portions 44, 54, the twisted portions 440, 540 are forced to return to their original plate shape, and a shear force acts on the concrete around the twisted portions 440, 540. However, because they are divided into multiple small pieces 443, 543, the shear force can be dispersed more effectively than with a single twisted portion, reducing the impact on the concrete and increasing stability.

[0064] In this embodiment, the two strips of the twisted portions 440 and 540 are rotated 90 degrees in the same direction, but the present invention is not limited to this and may be rotated in different directions. For example, one strip may be rotated clockwise and the other strip may be rotated counterclockwise.

[0065] <Third embodiment> Hereinafter, the third embodiment of the present invention will be described with reference to Fig. 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.

[0066] In the third embodiment, two strips 443, 543 formed on one side connector 4 and the other side connector 5 are rotated at different angles to form twisted portions 440, 540. Therefore, the two twisted portions 440, 540 are inclined at different angles, and reinforcing bars 442, 542 provided at different angles are inserted into the through holes 441, 541 of the twisted portions 440, 540. The reinforcing bars 442, 542 penetrating the two twisted portions 440, 540 are arranged so as to extend at different angles to each other within the segment 2.

[0067] The twisted portions 440, 540 and reinforcing bars 442, 542 that are inclined at different angles can resist forces acting in different directions between the joined segments 2.

[0068] [Other Modifications] The present invention is not limited to the above-mentioned embodiment, and may also include the following, for example.

[0069] 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 this case, the extension direction of the anchor portion is the axial direction of the tunnel.

[0070] Furthermore, the engagement of the joint is not limited to movement in the tunnel axial direction, but may be applied, for example, to engagement by movement in the tunnel radial direction, or to fastening one side connector and the other side connector with a bolt.

[0071] In this embodiment, one engaged surface and one engaging surface are provided on each of both sides of the one-side connector and the other-side connector, but a plurality of each may be provided.

[0072] In the first embodiment, the anchor portion is rotated 90 degrees to form the twisted portion, but it may be rotated at an angle other than this. For example, it may be rotated 270 degrees or more to provide a certain number of twists and further provide pull-out resistance. In this case, the reinforcing bar inserted into the through hole of the twisted section is positioned slightly diagonally with respect to the peripheral surface of the segment, but there are fewer length restrictions compared to reinforcing bars positioned in the thickness direction of the segment.

[0073] In the second and third embodiments, two twisted portions are formed in the one-side connector and the other-side connector, but more twisted portions may be provided.

[0074] Each technical matter in any embodiment may be applied to another embodiment to serve as an example. [Explanation of symbols]

[0075] 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 One-side connector 40 Bottom Wall 41 Groove 410 Groove wall 411 Engaged surface 41a Groove wall protrusion 42 Opening on the segment joint surface side 43 Side wall 44 Anchor part 440 Twisted section 441 Through hole 442 Reinforced Concrete 443 Strips 45 Female side retaining ridge 450 Female side retaining surface 46 Female part 460 Plate-shaped part 47 Connectors 48 One side engagement part 5 Other side connector 50 Plate-shaped part 51 Protrusion 511 Engagement surface 51a Plate-shaped protrusion 54 Anchor part 540 Twisted section 541 Through hole 542 Reinforced Concrete 543 Strips 58 Other side engagement part

Claims

1. A segment joint comprising a connecting portion for connecting to another segment joint, an anchor portion embedded in the segment, and a plate-shaped body, the plate-like body has a twisted portion formed by rotating the opposite side of the connecting portion of the plate-like body around an axis along the extension direction of the plate-like body; A through hole provided in the twisted portion through which a reinforcing bar can pass, The torsion portion is the anchor portion. A segment joint comprising:

2. The twisted portion is formed by rotating the plate-like body on the opposite side to the connecting portion by 90 degrees around an axis along the extending direction of the plate-like body.

2. The segment joint according to claim 1 .

3. The opposite side of the connecting portion of the plate-like body is divided into a plurality of strips along the extending direction of the plate-like body, and the plurality of strips are provided with the twisted portion and the through hole.

2. The segment joint according to claim 1 .

4. The twisted portion is formed by rotating the plate-like body on the opposite side to the connecting portion by 90 degrees around an axis along the extending direction of the plate-like body.

4. The segment joint according to claim 3.

5. 4. The segment joint according to claim 3, wherein the twisted portions of the plurality of strips are formed by being rotated at the same angle.

6. The segment joint according to claim 3 , wherein the twisted portions of the plurality of strips are formed by being rotated at different angles.

7. A segment embedding structure of a segment joint including a connecting portion to be connected to another segment joint, an anchor portion embedded in the segment, and a plate-shaped body, the plate-like body has a twisted portion formed by rotating the opposite side of the connecting portion of the plate-like body around an axis along the extension direction of the plate-like body; A through hole provided in the twisted portion through which a reinforcing bar can pass, a non-rotating portion of the twisted portion is provided along a peripheral surface of the segment, and a most rotated portion of the twisted portion is provided along a direction intersecting a direction along the peripheral surface of the segment, The reinforcing bar is disposed through the through hole. A segment embedding structure of a segment joint.

8. a portion of the twisted portion that is rotated most is provided along a direction perpendicular to a direction along a circumferential surface of the segment, The reinforcing bar is disposed in the through hole so as to penetrate in a direction along the peripheral surface of the segment. The segment embedding structure of a segment joint according to claim 7.

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