Segment joint and segment joint manufacturing method

Abstract

To provide a segment joint that enables a coupler to be processed and a segment to be manufactured easily and is stably fixed to the segment.SOLUTION: A segment joint 3 comprises: a coupling part to be coupled with another segment joint; anchor parts 44, 54 that have a plate-like part formed by being drawn on the opposite side of the coupling part and are embedded in a segment. The plate-like part comprises: gaps 440, 540 formed along a drawing direction of the plate-like part so that both ends do not reach an end of the plate-like part; an a plurality of strip parts 441, 541 divided so that at least one edge is the gaps 440, 540. At least one strip part among the plurality of strip parts is one-directional protruded strip parts 441a, 541a formed so as to protrude in one direction of a thickness direction of the plate-like part.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] A fastener is known as a joint for connecting segments, which includes a first fastening part having a first anchor part having one end embedded in a first fastened member and the other end protruding from a first fastening surface, and a first engaging part provided at the other end of the first anchor part, and a second fastening part having a second anchor part embedded in a second fastened member, a receiving part provided in the second anchor part, and a second engaging part provided in the receiving part (Patent Document 1).

[0003] The fastener described in Patent Document 1 has stopper parts protruding from both sides of the tips of the first anchor part and the second anchor part, the tips of the first anchor part and the second anchor part being T-shaped, and the engagement surfaces of the stopper parts engage with concrete or rebar, preventing the first anchor part and the second anchor part from coming off the fastened member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3179647 Summary of the Invention [Problem to be solved by the invention]

[0005] Fasteners such as that described in Patent Document 1 require cumbersome processing such as welding a separate member to the anchor body to form the stopper portion, and the mold must be made more complex to mold the stopper portion as a single unit. In addition, since the stopper portion is simply hooked onto the reinforcing bar, in order to engage the engagement surface of the stopper portion with a long, straight reinforcing bar that is arranged parallel to the face direction of the segment, the reinforcing bar and the stopper portion must be temporarily fixed together by welding or the like when they are installed within the segment.

[0006] The problem that the present invention is to solve is to provide a segment joint which allows easy processing of the anchor portion and easy manufacturing of the segments and which is stably fixed to 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, and an anchor part having a plate-shaped part formed extending on the opposite side of the connecting part and embedded in a segment, wherein the plate-shaped part comprises a slit formed along the extension direction of the plate-shaped part and such that both ends do not reach the ends of the plate-shaped part, and a plurality of strip parts divided by the slit as at least one edge, and at least one of the plurality of strip parts is a unidirectional protruding strip part formed to protrude in one direction in the thickness direction of the plate-shaped part.

[0008] The invention of claim 2 of the present application is a segment joint as described in claim 1, characterized in that at least one of the multiple strip portions other than the one-direction protruding strip portion is an other-direction protruding strip portion formed by protruding in the other direction of the thickness direction of the plate-shaped portion.

[0009] The invention of claim 3 of the present application is a segment joint as described in claim 2, characterized in that reinforcing bars can be inserted into the space formed by the one-direction protruding strip portion and the other-direction protruding strip portion.

[0010] The invention of claim 4 of the present application is a segment joint as described in claim 1, characterized in that at least one of the multiple strip portions other than the one-way protruding strip portion is a non-protruding strip portion that is not formed protruding in the thickness direction of the plate-shaped portion.

[0011] The invention of claim 5 of the present application is a segment joint as described in claim 4, characterized in that reinforcing bars can be inserted into the space formed by the one-way protruding strip portion and the non-protruding strip portion.

[0012] The invention of claim 6 of the present application is a manufacturing method for a segment joint comprising a connecting part for connecting to other segment joints, and an anchor part having a plate-shaped part formed extending on the opposite side of the connecting part and embedded in a segment, wherein a slit is formed along the extension direction of the plate-shaped part so that both ends do not reach the ends of the plate-shaped part, forming a plurality of small piece parts divided with the slit as at least one edge, and at least one of the plurality of small piece parts is pressed in one direction in the thickness direction of the plate-shaped part to protrude, thereby forming a one-way protruding small piece part.

[0013] The invention of claim 7 of the present application is a manufacturing method for a segment joint as described in claim 6, characterized in that at least one of the multiple strip portions other than the one-direction protruding strip portion is pressed in the other direction of the thickness direction of the plate-shaped portion to protrude, thereby forming an other-direction protruding strip portion.

[0014] The invention of claim 8 of the present application is a manufacturing method for a segment joint as described in claim 7, characterized in that the space formed by the one-direction protruding strip portion and the other-direction protruding strip portion is formed into a space through which reinforcing bars can be inserted.

[0015] The invention of claim 9 of the present application is a manufacturing method for a segment joint as described in claim 6, characterized in that for at least one of the multiple strip portions other than the one-way protruding strip portion, a non-protruding strip portion is formed that is not pressed and does not protrude in the thickness direction of the plate-shaped portion.

[0016] The invention of claim 10 of the present application is a manufacturing method for a segment joint as described in claim 9, characterized in that the space formed by the one-way protruding strip portion and the non-protruding strip portion is formed into a space through which reinforcing bars can be inserted. Effect of the Invention

[0017] According to the present invention, the strip portion protruding in one direction of the plate-shaped portion of the anchor portion is engaged with the concrete that constitutes the segment, thereby improving the pull-out resistance of the segment joint. Furthermore, since the one-way protruding strip portion can be formed simply by making a slit in the plate-like portion and pressing it to make it protrude, there is no need to weld a separate member, and processing is simplified, making it easy to manufacture the segment joint.

[0018] In addition, the other-direction protruding strip portion of the plate-like portion of the anchor portion can further improve the pull-out resistance in addition to that provided by the one-direction protruding strip portion. Furthermore, since the strip portions protruding in other directions can be formed simply by making cuts in the plate-like portion and extruding it, there is no need to weld separate members, and processing is simplified, making it easy to manufacture the segment joint.

[0019] In addition, reinforcing bars can be inserted into the spaces between the one-way protruding strip portions and the other-way protruding strip portions, or between the one-way protruding strip portions and the non-protruding strip portions, thereby further improving pull-out resistance. In addition, since reinforcing bars can be inserted into the space between the strip portions protruding in one direction and the strip portions protruding in the other direction, or between the strip portions protruding in one direction and the non-protruding strip portions, it is possible to pass reinforcement bars such as anchor bars and segment force distribution bars through the space, making it easier to temporarily fix the segment joints when manufacturing the segments. [Brief description of the drawings]

[0020] [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. 2 is a perspective view showing a connected state of the segment joint according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a plan view of the plate-shaped portion of the anchor according to the first embodiment of the present invention before a strip portion protruding in one direction is formed. [Figure 8] FIG. 1 is a side view of a segment joint showing a first embodiment of the present invention. [Figure 9] 5A to 5C are diagrams illustrating a procedure for connecting segment joints of segments according to the first embodiment of the present invention. [Figure 10] 11 is a plan view of a plate-shaped portion of an anchor according to a second embodiment of the present invention before formation of strips protruding in one direction and strips protruding in the other direction. FIG. [Figure 11] FIG. 11 is a perspective view of an anchor portion according to a second embodiment of the present invention. [Figure 12] FIG. 4 is a side view of a segment joint showing a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] 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. A segment joint and a method for manufacturing the segment joint will be described.

[0022] <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 connector and other side connector of the segment joint in the plan view of the segment viewed from the tunnel center side, Figure 5 shows one side connector and other side connector of the segment joint, Figure 5(a) is a side view, Figure 5(b) is a plan view, Figure 6 is an oblique view showing the connected state of the segment joint, Figure 7 is a plan view before the formation of the one-way protruding strip portion of the plate-shaped part of the anchor part, Figure 8 is a side view of the segment joint, and Figure 9 is a diagram showing the procedure for connecting the segment joints of the segments.

[0023] 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.

[0024] 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.

[0025] The segment joint 3 (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 faces of the segment 2 in the tunnel circumferential direction. The one-side connectors 4 are female connectors, two of which are provided on one joint surface 20a along the tunnel axis direction, and the other-side connectors 5 are male connectors, two of which are provided on the other joint surface 20b along the tunnel axis direction.

[0026] 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.

[0027] 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.

[0028] 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 .

[0029] 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 .

[0030] 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 .

[0031] 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.

[0032] 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.

[0033] 6 and 8, the anchor portion 44 provided from the bottom wall 40 is formed of a band-shaped flat plate along the peripheral surface of the segment 2, and extends in the opposite direction to the segment joint surface 20 along the approximate circumferential direction of the tunnel. This plate-shaped flat plate corresponds to the plate-shaped portion of the present invention.

[0034] As shown in FIG. 7, two slits 440 are formed in the anchor portion 44 along its extension direction (the circumferential direction of the segment 2) so that both ends do not reach the ends of the plate-shaped portion (anchor portion 44). The slits 440 divide the intermediate portion of the anchor portion 44 in the longitudinal direction into a plurality of (three in this embodiment) flat strip portions 441.

[0035] These multiple strip portions 441 are divided by at least one edge defined by a slit 440. Specifically, of the three strip portions 441, the central one has two slits 440 as edges of the strip portion 441, and the two on either side have one slit 440 and the outer edge of the plate-shaped portion 50 as edges of the strip portion 441.

[0036] Of the three strip portions 441, the central strip portion 441 is pressed with a pressing tool or the like to protrude in one direction in the thickness direction of the plate-shaped portion (for example, toward the inner surface of segment 2) to form a one-way protruding strip portion 441a, as shown in Figures 6 and 8. The strip portion 441a protruding in one direction is curved in the protruding direction.

[0037] The protruding strips 441 on both sides of the one-way protruding strip portion 441a are not pressed and do not protrude, so as to form flat, non-protruding strip portions 441b as shown in FIGS.

[0038] The one-direction protruding strip portion 441a is pressed against the non-protruding strip portion 441b to protrude so as to form a space large enough to allow the reinforcing bar 442 to pass therethrough in a side view. Since the one-way protruding strip portions 441a and the non-protruding strip portions 441b are arranged alternately, a reinforcing bar 442 can be inserted into the space formed by the one-way protruding strip portions 441a and the non-protruding strip portions 441b. This reinforcing bar corresponds to the reinforcing bar of the present invention.

[0039] 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 . The plate-shaped portion of the anchor portion 44 extends approximately parallel to the surface direction of the segment 2, and the reinforcing bar 442 inserted into the space formed by the one-way protruding strip portion 441a and the non-protruding strip portion 441b also extends approximately parallel to the surface direction of the segment 2. As a result, the straight-line length of the reinforcing bar 442 can be made longer than when it is taken in the thickness direction of the segment 2, and large resistance to pull-out force can be obtained. In addition, reinforcement bars such as the force distribution bars of segment 2 can also be inserted through the slot, making it easier to temporarily fix the segment joints when manufacturing the segments.

[0040] As shown in Figure 5, the other-side connector 5 has a plate-shaped portion 50 whose tip portion protrudes from the segment joint surface 20 in the tunnel circumferential direction and moves from the face in the tunnel axial direction toward the tunnel entrance (one direction (arrow B)) to be inserted inside the groove portion 41.

[0041] The base end of the plate-like portion 50 is an anchor portion 54 that is embedded in the segment 2. That is, the anchor portion 54 has a plate-like portion 50. The plate-like portion 50 of the anchor portion 54 corresponds to the plate-like portion of the present invention. The plate-shaped portion 50 is integrally formed including 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 of the plate-shaped portion 50 is connected to the one-side connector 4, and corresponds to the connecting portion of the present invention.

[0042] 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.

[0043] As shown in FIG. 7, two slits 540 are formed in the anchor portion 54 along its extension direction (the circumferential direction of the segment 2) so that both ends do not reach the ends of the plate-shaped portion 50 (anchor portion 54). The slits 540 divide the intermediate portion of the anchor portion 54 in the longitudinal direction into a plurality of (three in this embodiment) flat strip portions 541.

[0044] These multiple strip portions 541 are divided by at least one edge defined by a slit 540. Specifically, of the three strip portions 541, the central one has two slits 540 as edges of the strip portion 541, and the two on either side have one slit 540 and the outer edge of the plate-like portion 50 as edges of the strip portion 541.

[0045] Of the three strip portions 541, the central strip portion 541 is pressed with a pressing tool or the like to protrude in the other direction in the thickness direction of the plate-shaped portion 50 (for example, toward the outer peripheral surface of segment 2), thereby forming the other-direction protruding strip portion 541c, as shown in Figures 6 and 8. The other protruding strip portion 541c is curved in the protruding direction.

[0046] The strips 541 on both sides of the other protruding strip 541c are not pressed and do not protrude, so as to form flat non-protruding strips 541b as shown in FIGS.

[0047] The other protruding strip portion 541c is pressed against the non-protruding strip portion 541b to protrude therefrom so as to form a space large enough to allow the reinforcing bar 542 to pass therethrough in a side view. The other-direction protruding strip portions 541c and the non-protruding strip portions 541b are arranged alternately, so that the reinforcing bar 542 can be inserted into the space formed by the other-direction protruding strip portions 541c and the non-protruding strip portions 541b. This reinforcing bar corresponds to the reinforcing bar of the present invention.

[0048] 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 . The plate-shaped portion 50 of the anchor portion 54 extends approximately parallel to the surface direction of the segment 2, and the reinforcing bar 542 inserted into the space formed by the other-direction protruding strip portion 541c and the non-protruding strip portion 541b also extends approximately parallel to the surface direction of the segment 2. As a result, the straight-line length of the reinforcing bar 542 can be made longer than when it is taken in the thickness direction of the segment 2, and large resistance to pull-out force is obtained. In addition, reinforcement bars such as the force distribution bars of segment 2 can also be inserted through the slot, making it easier to temporarily fix the segment joints when manufacturing the segments.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Then, as shown in Figures 5(b), 6 and 8, the protrusion 51 enters (arrow A) toward the recess 23a of the segment 2 installed previously in the circumferential direction of the tunnel, 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.

[0053] FIG. 9 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.

[0054] To connect the segments 2, as shown in FIG. 9(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.

[0055] Next, as shown in Figure 9(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.

[0056] Next, as shown in Figure 9 (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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In the segment joint 3, not only is the one-side connector 4 less likely to open, but concrete can penetrate between and around the one-direction protruding piece portions 441a, 541a, the other-direction protruding piece portions 441c, 541c, and the non-protruding piece portions 441b, 541b of the anchor portions 44, 54, increasing the fixation of the one-side connector 4 and the other-side connector 5. By inserting the reinforcing bars 442, 542, which have fewer length restrictions, into the spaces between the one-direction protruding piece portions 441a, 541a and the non-protruding piece portions 441b, 541b, and between the other-direction protruding piece portions 441c, 541c and the non-protruding piece portions 441b, 541b, the force resisting pull-out is further increased, thereby increasing the joining strength of the segments 2.

[0061] As a protrusion for improving the pull-out resistance of the anchor portions 44, 54, protruding strip portions can be formed simply by making slits 440, 540 in the plate-like portion and pushing it out, so processing is simple without the need for a separate member, and the segment joint can also be manufactured easily.

[0062] <Second embodiment> The second embodiment of the present invention will be described below with reference to Figures 10 to 12. Note that a description of the same parts as in the first embodiment will be omitted, and differences will be mainly described. FIG. 10 is a plan view of the plate portion of the anchor portion before the one-direction protruding strip portion and the other-direction protruding strip portion are formed, FIG. 11 is a perspective view of the anchor portion, and FIG. 12 is a side view of the segment joint.

[0063] In the second embodiment, the anchor portions 44, 54 of the one-side connector 4 and the other-side connector 5 are provided with both strip portions 441a, 541a protruding in one direction and strip portions 441c, 541c protruding in the other direction, respectively.

[0064] As shown in FIG. 10, the anchor portions 44, 54 have three slits 440, 540 formed along their extension direction (the circumferential direction of the segment 2) such that both ends do not reach the ends of the plate-shaped portions (anchor portions 44, 54). The cuts 440, 540 divide the intermediate portions of the anchor portions 44, 54 in the longitudinal direction into a plurality of (four in this embodiment) flat strip portions 441, 541.

[0065] These multiple strip portions 441, 541 are divided by at least one edge defined by a slit 440, 540. Specifically, of the four strip portions 441, 541, the central two have two slits 440, 540 as edges of the strip portions 441, 541, and the two on either side have one slit 440, 540 and the outer edge of the plate-shaped portion 50 as edges of the strip portions 441, 541.

[0066] The first and third strip portions 441, 541 from one side of the four strip portions 441, 541 are pressed and protruded in one direction in the thickness direction of the plate-shaped portion (for example, toward the inner surface of segment 2) using a pressing tool or the like to form one-way protruding strip portions 441a, 541a as shown in Figures 11 and 12. The strip portions 441a and 541a protruding in one direction are curved in the protruding direction.

[0067] The second and fourth strip portions 441, 541 from one side of the four strip portions 441, 541 are pressed with a pressing tool or the like to protrude in the other direction in the thickness direction of the plate-shaped portion (for example, toward the outer peripheral surface of segment 2) to form other-direction protruding strip portions 441c, 541c as shown in Figures 11 and 12. The other protruding strip portions 441c and 541c are curved in the protruding direction.

[0068] The strip portions 441a, 541a protruding in one direction and the strip portions 441c, 541c protruding in the other direction are pressed against each other to protrude so as to form a space large enough to allow the reinforcing bars 442, 542 to pass therethrough in a side view. Since the strips 441a, 541a protruding in one direction and the strips 441c, 541c protruding in the other direction are arranged alternately, reinforcing bars 442, 542 can be inserted through the spaces formed by the strips 441a, 541a protruding in one direction and the strips 441c, 541c protruding in the other direction.

[0069] In the second embodiment, in addition to improving the joint strength of the segment 2 as in the first embodiment, the one-direction protruding piece portions 441a, 541a and the other-direction protruding piece portions 441c, 541c protrude from both the outer peripheral surface side and the inner peripheral surface side of the segment 2, thereby adhering to the concrete in a balanced manner and improving the pull-out resistance in a stable manner.

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

[0071] In this embodiment, the 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.

[0072] 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 the connection between one side connector and the other side connector may be fastened with a bolt.

[0073] 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.

[0074] In the first embodiment, one protruding strip portion and two non-protruding strip portions are alternately arranged, but multiple protruding strip portions and multiple non-protruding strip portions may be alternately arranged. Also, instead of alternately arranging the protruding strip portion and the non-protruding strip portion, either one may be arranged adjacent to the other.

[0075] In the second embodiment, two strip portions protruding in one direction and two strip portions protruding in the other direction are provided alternately, but the number is not limited thereto and may be increased or decreased.

[0076] Each technical matter in any embodiment may be applied to another embodiment to serve as an example. For example, the first and second embodiments may be combined to adopt a strip portion protruding in one direction, a strip portion protruding in the other direction, and a strip portion not protruding in the other direction, in which case the reinforcing bars can be inserted in two stages, further improving the pull-out resistance. [Explanation of symbols]

[0077] 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 Break 441 Strip part 441a One-way protruding strip 441b Non-protruding strip 441c Strip part protruding in other direction 442 Reinforced Concrete 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 Break 541 Strip part 541a One-way protruding strip 541b Non-protruding strip 541c Strip part protruding in other direction 542 Reinforced Concrete 58 Other side engagement part

Claims

1. A segment joint comprising a connecting portion to be connected to another segment joint, and an anchor portion having a plate-shaped portion formed by extending on the opposite side of the connecting portion and embedded in the segment, The plate-shaped portion is A cut is formed along the extension direction of the plate-shaped portion and such that both ends do not reach the ends of the plate-shaped portion; a plurality of strip portions divided by the cut along at least one edge; At least one of the plurality of strip portions is a unidirectionally protruding strip portion formed to protrude in one direction in the thickness direction of the plate-like portion. A segment joint comprising:

2. At least one of the plurality of strip portions other than the one-direction protruding strip portion is an other-direction protruding strip portion formed to protrude in another direction in the thickness direction of the plate-shaped portion.

2. The segment joint according to claim 1 .

3. 3. The segment joint according to claim 2, wherein a reinforcing bar can be inserted into a space formed by the one-direction protruding strip portion and the other-direction protruding strip portion.

4. At least one of the plurality of strip portions other than the one-direction protruding strip portion is a non-protruding strip portion that is not formed to protrude in the thickness direction of the plate-like portion.

2. The segment joint according to claim 1 .

5. 5. The segment joint according to claim 4, wherein a reinforcing bar can be inserted into a space formed by the one-way protruding strip portion and the non-protruding strip portion.

6. A method for manufacturing a segment joint comprising: a connecting portion to be connected to another segment joint; and an anchor portion having a plate-shaped portion formed by extending on the opposite side of the connecting portion and embedded in a segment, forming a slit along the extension direction of the plate-like portion and such that both ends do not reach the ends of the plate-like portion, thereby forming a plurality of strip portions divided by the slit as at least one edge; At least one of the plurality of strip portions is pressed in one direction in the thickness direction of the plate-shaped portion to form a strip portion protruding in one direction. A method for manufacturing a segment joint.

7. At least one of the plurality of strip portions other than the one-direction protruding strip portion is pressed in another thickness direction of the plate-like portion to form the other-direction protruding strip portion. The method for manufacturing a segment joint according to claim 6 .

8. The space formed by the strip portion protruding in one direction and the strip portion protruding in the other direction is formed into a space through which a reinforcing bar can be inserted. The method for manufacturing a segment joint according to claim 7 .

9. At least one of the plurality of strip portions other than the one-direction protruding strip portion is formed as a non-protruding strip portion that is not pressed in the thickness direction of the plate-like portion and does not protrude. The method for manufacturing a segment joint according to claim 6 .

10. The space formed by the one-way protruding strip portion and the non-protruding strip portion is formed into a space through which a reinforcing bar can be inserted. The method for manufacturing a segment joint according to claim 9 .

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