JP2023151243A - Segment joint - Google Patents

Abstract

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

Description

The present invention relates to a segment joint suitable for connecting segments in construction of a shield tunnel.

As a joint structure of the segments, a so-called hook joint is provided as a joint between the two segments to be joined, and the joint locking part (female part as an example) provided on the joint surface of one segment between the segments is connected to the joint of the other segment. A joining structure is known in which segments in each segment are joined by moving a joint locking part (for example, a male part) provided on a joining surface in the tunnel axis direction (Patent Document 1).

Patent Document 1 discloses a female joint in which two plate-shaped bases are placed at positions apart to form a substantially C-shaped cross section, and two plate-shaped bases are placed close together to form a substantially T-shaped cross section. The two bases of the male joint fit into the slit of the approximately C-shaped female joint, and the locking parts of both joints lock with each other, thereby connecting both segments. It is used for joining.

Japanese Patent Application Publication No. 2000-328889

In the joint structure of the segments as described in Patent Document 1, the female joint in which the exposed end of the base is bent into a substantially L-shape is likely to open, and the joint may shift from the center position within the joint. , the bonding may become unstable.

The problem to be solved by the present invention is to prevent the female joint body from opening, and to suppress misalignment by guiding the female joint body to the center position within the joint in the radial direction of the tunnel. It is about providing.

The invention according to claim 1 of the present application provides a female connector having a bottom portion, a pair of groove walls, and an opening on the segment joining surface side and having a groove portion formed along one direction; a male connector having a plate-like part that protrudes from the base end, moves along the one direction, and engages with the groove inside the groove, the segment joint comprising: a first engaged surface that is formed to protrude and engage with the plate-shaped portion; and a first engagement surface that is formed to protrude from a side surface of the plate-shaped portion and engages with the first engaged surface. a first engaging portion is formed by a surface, the first engaged surface is inclined toward a side opposite to the opening as it moves away from the groove wall, and the first engaging surface is inclined toward the side opposite to the opening. The plate-shaped portion is inclined toward the base end side as it moves away from the side surface, the first engaging portion regulates opening of the groove wall portion, and the plate-shaped portion is formed to protrude from the side surface. and a center guide surface that is provided on the plate-shaped part guide protrusion and guides the plate-shaped part to the center inside the groove when moving in the one direction. This is a segment joint featuring the following.

The invention according to claim 2 of the present application is the segment joint according to claim 1, wherein the center guide surface is formed so that the height thereof gradually decreases along the one direction.

The invention according to claim 3 of the present application is the segment joint according to claim 1 or 2, characterized in that the center guide surface is provided closer to the base end than the first engaging part. be.

The invention according to claim 4 of the present application is the segment joint according to claim 1 or 2, characterized in that the center guide surface is provided on a side opposite to the base end part from the first engaging part. It is.

According to the present invention, the first engaged surface is formed to protrude from the groove wall portion and engages with the plate-shaped portion, and the first engaged surface is formed to protrude from the side surface of the plate-shaped portion and The first engaging surface to be engaged is formed as a V-shaped inclined surface whose mutual spacing increases toward the segment joining surface, and the first engaged surface is formed from the groove wall section to the first engaging surface. The first engaging surface is inclined toward the proximal end side as it moves away from the side surface of the plate-shaped portion, and the first engaging surface is inclined toward the side opposite to the opening as it moves away from the side surface of the plate-like portion. The plate-like part is provided with a plate-like protrusion formed to protrude from the side surface, and is provided on the plate-like protrusion, and moves in one direction, which is the segment insertion direction, that is, the tunnel axis direction. It has a center guide surface that guides the plate part to the center inside the groove part when assembling the segment, and by guiding it to the center position in the joint in the radial direction of the tunnel, eccentricity is suppressed and the construction accuracy and accuracy during segment assembly are improved. Can form high-quality segment joints.

In addition, the center guide surface is formed so that the height gradually decreases along one direction, so that when the male connector penetrates, the clearance becomes narrower as it goes deeper, and the male connector becomes closer to the female connector. By guiding the connecting tool to the center position inside the groove, the amount of eccentricity is suppressed, and it is possible to form a segment joint with high construction accuracy and quality when assembling the segments.

FIG. 1 is a schematic diagram of a shield tunnel according to a first embodiment of the present invention. FIG. 2 is a plan view of the segment according to the first embodiment of the present invention, viewed from the tunnel center side. FIG. 2 is a side view of the segment according to the first embodiment of the present invention, viewed from the tunnel axis direction. FIG. 2 is an enlarged view of essential parts of a female connector and a male connector of a segment joint in a plan view of the segment according to the first embodiment of the present invention, viewed from the tunnel center side. A female connector and a male connector of a segment joint according to a first embodiment of the present invention are shown, with FIG. 5(a) being a side view and FIG. 5(b) being a plan view. FIG. 2 is a perspective view of a segment joint according to the first embodiment of the present invention connected by a female connector and a male connector. FIG. 2 is a side view of the segment joint according to the first embodiment of the present invention in which a female connector and a male connector are connected; It is a figure showing the connection procedure of the segment joint of the segment concerning the 1st embodiment of the present invention. It is a side view which connected the female type|mold connection tool and male type|mold connection device of the segment joint based on the 2nd Embodiment of this invention. A female connector and a male connector of a segment joint according to a third embodiment of the present invention are shown, with FIG. 10(a) being a side view and FIG. 10(b) being a plan view. FIG. 7 is a perspective view of a segment joint according to a third embodiment of the present invention connected by a female connector and a male connector; It is a side view which connected the female type|mold connector and male type|mold connector of the segment joint based on the 3rd Embodiment of this invention. It is a side view which connected the segment joint based on the 4th Embodiment of this invention. It is a side view which provided the center guide surface of the segment joint based on the 5th Embodiment of this invention, and was connected. The MM sectional view in FIG. 14 and FIG. 15(b) correspond to the MM sectional view in FIG. 14 without the center guide surface. It is a side view which provided the center guide surface of the segment joint based on the 6th Embodiment of this invention, and was connected.

Embodiments of the present invention will be described below with reference to the drawings. Note that it goes without saying that the present invention is not limited to the embodiments.
The following description relates to an embodiment in which the present invention is applied to a segment joint that connects segment pieces adjacent in the tunnel circumferential direction in a shield tunnel.

<First embodiment>
This embodiment has a female joint in which two plate-shaped bases are placed at positions apart to form a substantially C-shaped cross section, and two plate-shaped bases are placed close together to form a substantially T-shaped cross section. The two bases of the male joint fit into the slit of the approximately C-shaped female joint, and the locking parts of both joints lock with each other, thereby connecting both segments. This solves the problem of female joints that are easy to open when the two bases are placed apart to form a roughly C-shaped cross section in a joint structure where the joints are joined by a C-shaped cross section. This provides a segment joint with improved construction accuracy and quality during segment assembly.

FIG. 1 is a schematic diagram of a shield tunnel, FIG. 2 is a plan view of a segment viewed from the tunnel center side, FIG. 3 is a side view of the segment viewed from the tunnel axis direction, and FIG. 4 is a segment viewed from the tunnel center side. An enlarged view of the main parts of the female connector and the male connector of the segment joint in a plan view, FIG. 5 shows the female connector and the male connector of the segment joint, and FIG. 5(a) is a side view. , FIG. 5(b) is a plan view, FIG. 6 is a perspective view of the connection state using the female connector and male connector of the segment joint, and FIG. 7 is a diagram showing the female connector and male connector of the segment joint. The connected side view, FIG. 8, is a diagram showing the connecting procedure of the segment joints of the segments.

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

As shown in FIGS. 2 and 3, ring-to-ring joints 22, which are segment joints for connecting segment rings 21, are provided on both sides of the segment 2 in the tunnel axial direction.
In this embodiment, the ring-to-ring joint 22 employs a so-called one-pass joint consisting of a male metal fitting and a female metal fitting embedded in both sides of the segment 2, respectively.

As shown in FIGS. 2 and 3, the segment joints 3 (piece-to-piece joints) connecting the segments 2 adjacent in the tunnel circumferential direction are connected to the segment joint surfaces 20, which are both end surfaces of the segments 2 in the tunnel circumferential direction. A female connector 4 and a male connector 5 made of steel, for example, are provided, respectively.
Two female connectors 4 are provided on one joint surface 20a along the tunnel axis direction, and two male connectors 5 are provided on the other joint surface 20b along the tunnel axis direction.

As shown in FIG. 4, the female connector 4 and the male connector 5 each include an anchor portion 6 that is embedded in the concrete that constitutes the segment 2. In the present embodiment, the anchor portion 6 has a plate-like shape, but a strip-shaped anchor, a perforated steel plate anchor type, etc. can be selected as appropriate.

As shown in FIG. 4, a recess 23a is provided in one joint surface 20a, and the female connector 4 is embedded adjacent to the recess 23a in the tunnel axial direction. The end of the female connector 4 is provided flush with one joint surface 20a.
The male connector 5 is provided on the segment 2 so as to protrude from the other joint surface 20b.

As shown in FIG. 5, the female connector 4 includes a bottom portion 40, a pair of groove wall portions 410, 410, and an opening portion 42 on the segment joint surface 20 side. (arrow B)).
The pair of groove wall portions 410, 410 are formed in parallel from the opening 42 on the segment joint surface 20 side to the bottom portion 40 approximately along the circumferential direction of the tunnel. An anchor portion 6 is provided on the bottom portion 40.

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 entrance side does not open (FIG. 5(b)).
The plate-shaped portion 51 of the male connector 5 is engaged with the groove portion 41 by moving from the face in the axial direction of the tunnel along the tunnel entrance direction (one direction (arrow B)).

In each of the pair of groove walls 410, 410, first groove wall protrusions 41a1, 41a1 are formed to protrude symmetrically toward the inside of the groove 41 (FIG. 5(a)). The surfaces of the groove wall first protrusions 41a1, 41a1 on the inner side of the groove 41 are planar.
The groove wall first protrusions 41a1, 41a1 have a predetermined length along the tunnel axis direction, and are formed so that the width increases symmetrically from the face toward the tunnel entrance direction (one direction (arrow B)). (Figure 5(b)).

The side surfaces of the groove wall first protrusions 41a1, 41a1 on the bottom 40 side are inclined toward the opposite side of the segment joint surface 20 (opening 42) as they protrude and move away from the respective groove walls 410, 410. Then, first engaged surfaces 411, 411 are formed (FIG. 5(a)).
That is, the groove portion 41 is formed as a V-shaped inclined surface that slopes toward the opposite side of the opening portion 42 as it protrudes away from each groove wall portion 410, 410, and the mutual interval increases toward the segment joining surface. First engaged surfaces 411, 411 are provided.

The side surfaces of the groove wall first protrusions 41a1, 41a1 on the opening 42 side have a shape that slopes toward the segment joining surface 20 (opening 42) as they protrude and move away from the respective groove walls 410, 410. , forming second engaged surfaces 412, 412 (FIG. 5(a)).
That is, the groove portion 41 is located closer to the opening 42 than the first engaged surfaces 411, 411, and as it protrudes and moves away from the groove walls 410, 410, it slopes toward the opening 42 and toward the segment joining surface. The second engaged surfaces 412, 412 are formed as inverted V-shaped inclined surfaces whose mutual spacing is reduced.

As shown in FIG. 5, the male connector 5 protrudes in the tunnel circumferential direction from the base end 50 on the segment joint surface 20 side, and extends from the face in the tunnel axis direction along the tunnel entrance direction (one direction (arrow B)). A plate-shaped portion 51 is provided which moves and engages with the groove portion 41 of the female connector 4 inside the groove portion 41.
The base end portion 50 is, for example, a part of the anchor portion 6 and is a portion buried below the segment joint surface 20 of the plate-like portion 51. In this embodiment, the plate-like portion 51 is integrally configured to include the base end portion 50 and the anchor portion 6.

Similarly to the groove portion 41, the plate portion 51 is also provided in a plate shape extending from the face in the tunnel axis direction to the tunnel entrance direction (one direction (arrow B)) (FIG. 5(b)).

On both sides of the plate-like part 51 in the tunnel radial direction, plate-like part first protrusions 51a1, 51a1 are formed to protrude symmetrically toward the pair of groove walls 410, 410, respectively (FIG. 5). (a)). The surfaces of the first plate-like protrusions 51a1, 51a1 on the groove wall portions 410, 410 side are planar.
The plate-like portion first protrusions 51a1, 51a1 have a predetermined length along the tunnel axis direction, and the side surface on the base end portion 50 side is segmented as it goes from the face to the tunnel entrance direction (one direction (arrow B)). It is provided so as to be separated from the bonding surface 20 (FIG. 5(b)).

The side surface of the proximal end portion 50 side of the plate-like portion first protrusions 51a1, 51a1 has a shape that is inclined toward the proximal end portion 50 side as it moves away from the side surface of the plate-like portion 51, and the first engagement surface 511 , 511 (FIG. 5(a)).
That is, the plate-like portion 51 is formed as a V-shaped inclined surface that inclines toward the proximal end portion 50 side as it protrudes from the side surface of the plate-like portion 51 and moves away from it, and the mutual interval increases toward the segment joining surface. First engaging surfaces 511, 511 are provided.

On both side surfaces of the plate-like portion 51 in the tunnel radial direction, plate-like portions are provided on the base end portion 50 side from the plate-like portion first protrusions 51a1, 51a1 and toward the pair of groove walls 410, 410, respectively. The second protrusions 51a2, 51a2 are formed to protrude symmetrically (FIG. 5(a)). The surfaces of the second plate-like protrusions 51a2, 51a2 on the groove wall portions 410, 410 side are planar.
The second plate-like protrusions 51a2, 51a2 have a predetermined length along the tunnel axis direction, and the side surface opposite to the base end 50 extends from the face toward the tunnel entrance (one direction (arrow B)). It is provided so as to approach the segment joint surface 20 (FIG. 5(b)).

The side surfaces of the second protrusions 51a2, 51a2 of the plate-like portions opposite to the base end portion 50 have a shape that is inclined toward the side opposite to the base end portion 50 as the distance from the side surface of the plate-like portion 51 increases. Surfaces 512, 512 are formed (FIG. 5(a)).
That is, the plate-shaped part 51 is located closer to the base end 50 than the first engagement surfaces 511, 511, and as it protrudes from the side surface of the plate-shaped part 51 and moves away from it, it slopes toward the opposite side of the base end 50, and the segment It is provided with second engagement surfaces 512, 512 formed as inverted V-shaped inclined surfaces whose mutual spacing decreases toward the joining surface.

Then, as shown in FIG. 5(b), FIG. 6, and FIG. 7, after the plate-like portion 51 enters toward the recess 23a of the segment 2 installed in advance in the circumferential direction of the tunnel (arrow A), When the first engaged surface 411, 411 and the first engaged surface 511, 511 come into contact with each other when the first engaged surface 411, 411 and the first engaged surface 511, 511 move from the face in the axial direction of the tunnel toward the tunnel entrance direction (one direction (arrow B)) and enter the inside of the groove 41. The first engaging part 31 is formed by this, and the second engaging part 32 is formed by the contact between the second engaged surfaces 412, 412 and the second engaging surfaces 512, 512, so that the female The groove portion 41 of the mold connector 4 and the plate-like portion 51 of the male connector 5 are engaged.

As shown in FIG. 5(b), the first engaged surfaces 411, 411 of the female connector 4 gradually form an opening 42 along the tunnel entrance direction (one direction (arrow B)) from the face in the tunnel axis direction. It is formed so as to be located on the opposite side (bottom 40 side).
Further, the second engaged surfaces 412, 412 of the female connector 4 are arranged so as to be gradually located toward the opening 42 side from the face in the tunnel axis direction along the tunnel entrance direction (one direction (arrow B)), that is, , are formed so as to be separated from the first engaged surfaces 411, 411 (closer to the segment joining surfaces 20).

As shown in FIG. 5(b), the first engaging surfaces 511, 511 of the male connector 5 gradually move toward the base end 50 along the tunnel entrance direction (one direction (arrow B)) from the face in the tunnel axis direction. It is formed so as to be located on the opposite side (away from the segment joining surface 20).
Further, the second engaging surfaces 512, 512 of the male connector 5 are arranged so that they are gradually located toward the proximal end 50 side from the face in the tunnel axis direction along the tunnel entrance direction (one direction (arrow B)). In other words, the first engagement surfaces 511, 511 are formed so as to be closer to the segment bonding surface 20), that is, to be farther away from the first engagement surfaces 511, 511 (closer to the segment bonding surface 20).

FIG. 8 shows a method of connecting segments 2 including a female connector 4 and a male connector 5 according to the first embodiment.
In order to construct a new segment ring 21 adjacent to the constructed segment ring 21, the segments 2 are successively connected in the tunnel circumferential direction.

To connect the segments 2, as shown in FIG. 8(a), connect the trailing segment 2A, which was installed before the existing segment ring 21, so that it faces the tunnel circumferential direction with a slight interval. Place segment 2B.
At this time, the recess 23a adjacent to the female connector 4 formed on the joint surface 20a of the segment 2A and the plate-shaped portion 51 of the male connector 5 formed on the joint surface 20b of the segment 2B are substantially opposed to each other. ing.

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

Next, as shown in FIG. 8(c), the trailing segment 2B is moved from the face in the axial direction of the tunnel toward the tunnel entrance (one direction (arrow B)), and the male connector 5 provided on the segment 2B is moved. The first engaging surfaces 511, 511 and the second engaging surfaces 512, 512 of the plate-like portion 51 of The engaging surfaces 511, 511 and the second engaging surfaces 512, 512 are engaged with each other to form the first engaging portions 31, 31 and the second engaging portions 32, 32 having a predetermined planar length. and connect them.

Note that if a plurality of engaging parts are provided, such as the first engaging parts 31, 31 and the second engaging parts 32, 32, manufacturing/construction errors may occur, but the joint surfaces 20a of the segments 2A, 2B , 20b are provided with a sealing material and a cushioning material (not shown), so that manufacturing and construction errors can be absorbed by these materials.

First engaged surfaces 411, 411 that are formed to protrude from the groove wall portions 410, 410 and engage with the plate-like portion 51; The first engaging surfaces 511, 511 that engage with the surfaces 411, 411 form the first engaging portions 31, 31, and the first engaged surfaces 411, 411 are separated from the groove wall portions 410, 410. The first engagement surfaces 511, 511 are inclined toward the proximal end 50 side as they move away from the side surface of the plate-shaped portion 51, that is, the first engagement surfaces The portions 31, 31 become V-shaped inclined surfaces whose mutual spacing increases toward the segment joining surface 20, and the first engaging portions 31, 31 restrict the opening of the groove wall portions 410, 410. , the female connector 4 is difficult to open, and joint strength is improved.

a second engaged surface 412, 412 that is located closer to the opening 42 than the first engaged surface 411, 411, protrudes from the groove wall 410, 410, and engages with the plate-like portion 51; A second engaging surface 512 is located closer to the base end 50 than the first engaging surfaces 511, 511, is formed to protrude from the side surface of the plate-like portion 51, and engages with the second engaged surfaces 412, 412. , 512, and the second engaging portions 32, 32 are formed, and each of the first engaging portions 31, 31 and the second engaging portions 32, 32 opens the groove wall portions 410, 410 at two locations. Since it is restricted, the female connector 4 is more difficult to open and the strength of the joint is improved.
Moreover, by providing the second engaging parts 32, 32 in addition to the first engaging parts 31, 31, the gap between the first engaging parts 31, 31 and the second engaging parts 32, 32 is At the same time, the plate-shaped part 51 is guided to the center position of the groove part 41 in the tunnel radial direction, so the generation of gaps between the engagement parts of each engaging part is suppressed, so that the female type is more The connecting tool 4 is difficult to open, and the strength of the joint is stable.

The second engaged surfaces 412 , 412 are inclined toward the opening 42 as they move away from the groove walls 410 , 410 , and the second engaged surfaces 512 , 512 are inclined toward the opening 42 as they move away from the side surfaces of the plate-like portion 51 . Therefore, the second engaging portions 32, 32 are inclined toward the side opposite to the base end portion 50. In other words, the second engaging portions 32, 32 form an inverted V-shaped inclined surface whose mutual interval decreases toward the segment joining surface 20, and the second engaging portions 32, Since the joining parts 32, 32 restrict the opening of the groove wall parts 410, 410, it becomes even more difficult for the female connector 4 to open. Furthermore, even if a force is applied to the joint in the opposite direction to the tension (the pushing direction in the circumferential direction of the tunnel (arrow A)), the force from the second engaging surfaces 512, 512 is transferred to the second engaged surface 412, 412 can be received and opposed, and the female connector 4 is bent in the closing direction due to the inclination, making it even more difficult to open.

The first engaged surfaces 411, 411 are formed so as to be gradually located on the opposite side of the opening 42 along one direction (arrow B), and in one direction (arrow B) which is the segment insertion direction, that is, the tunnel axis. The first engaging surfaces 511, 511 are formed to be gradually located on the opposite side of the base end 50 along one direction, Since the plate-shaped portion 51 of the male connector 5 is formed as an inclined surface that gradually moves away from the segment joining surface along one direction, which is the segment insertion direction, as the segments are joined along the segment joining surface 20, the plate-like portion 51 of the male connector 5 is guided to the bottom 40 side of the groove 41, and the segment joining surfaces 20, 20 are brought into closer contact.

In addition, the second engaged surfaces 412, 412 are formed to gradually move away from the first engaged surfaces 411, 411 along one direction (arrow B), and are formed in one direction, which is the segment insertion direction, that is, the tunnel The second engaging surfaces 512, 512 are formed to gradually move away from the first engaged surfaces 411, 411 along the axial direction, and the second engaging surfaces 512, 512 gradually move away from the first engaging surfaces 411, 411 along one direction (arrow B). 511, 511, and is formed to gradually move away from the first engaging surfaces 511, 511 along one direction, which is the segment insertion direction, so that the segments As they are joined, they are guided to the center position between the first engaging parts 31, 31 and the second engaging parts 32, 32.

<Second embodiment>
A second embodiment of the present invention will be described below with reference to FIG. 9. Note that descriptions of parts similar to those in the first embodiment will be omitted, and mainly different parts will be described.

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

The side surfaces of the first protrusions 41a1, 41a1 of the groove wall portions of the female connector 4 on the opening 42 side rise vertically from the respective groove wall portions 410, 410, and do not form second engaged surfaces.
In addition, the side surfaces of the first protrusions 41a1 and 41a1 on the opening 42 side of the groove wall portions are provided parallel to the tunnel face direction (one direction (arrow B)) from the face parallel to the tunnel axis direction (not shown). .

The side surfaces of the second protrusions 51a2, 51a2 of the male connector 5 on the side opposite to the base end portion 50 rise perpendicularly from the side surface of the plate portion 51, and do not form a second engagement surface.
Further, the side surface of the plate-like second protrusion 51a2, 51a2 opposite to the base end 50 is provided parallel to the tunnel entrance direction (one direction (arrow B)) from the face parallel to the tunnel axis direction. (Illustrated).

The female connector 4 includes a second groove wall protrusion 41a2, which is closer to the opening 42 than the first groove wall protrusion 41a1, 41a1, and which extends from the pair of groove walls 410, 410 toward the inner side of the groove 41. 41a2 are formed to protrude symmetrically.
The groove wall second protrusions 41a2, 41a2 have a predetermined length along the tunnel axis direction, and the side surfaces of the groove wall second protrusions 41a2, 41a2 on the bottom 40 side are the groove wall first protrusions. 41a1, 41a1 are parallel to the side surfaces on the bottom 40 side, and are formed to be located away from the segment joint surface 20 as you go from the face in the tunnel axis direction to the tunnel entrance direction (one direction (arrow B)). (not shown).

The side surfaces of the second groove wall protrusions 41a2, 41a2 on the bottom 40 side are inclined toward the opposite side of the opening 42 as they move away from the pair of groove walls 410, 410, thereby forming the second engaged surfaces 412, 412. is forming.

The male connector 5 has groove wall first protrusions 41a1, 41a1 and groove wall second protrusions 41a2, 41a2, which are closer to the base end 50 than the plate-like first protrusions 51a1, 51a1. Second plate-like protrusions 51a2, 51a2 are formed to protrude symmetrically toward the pair of groove walls 410, 410 so as to be located between the groove walls 410, 410.
The plate-like part second protrusions 51a2, 51a2 have a predetermined length along the tunnel axis direction, and the side surface of the plate-like part second protrusions 51a2, 51a2 on the proximal end 50 side is connected to the plate-like part first. The protrusions 51a1, 51a1 are parallel to the side surfaces on the proximal end 50 side, and are located away from the segment joint surface 20 as they go from the face in the tunnel axis direction to the tunnel entrance direction (one direction (arrow B)). (not shown).

The side surfaces of the second protrusions 51a2 and 51a2 on the base end 50 side are inclined toward the base end 50 as they move away from the side surface of the plate portion 51, and the second engagement surface 512 , 512 are formed.

The second engaged surfaces 412, 412 of the female connector 4 and the second engaging surfaces 512, 512 of the male connector 5 form a V-shaped slope in which the mutual interval increases toward the segment joining surface. The second engaging portions 32, 32 are formed as surfaces.

Since there are joints at two locations, the first engaging portions 31, 31 and the second engaging portions 32, 32, it becomes more difficult to open the joint body, and force acts on the joint in the tensile direction. You can even make it more competitive.

<Third embodiment>
A third embodiment of the present invention will be described below with reference to FIGS. 10 to 12. Note that descriptions of parts similar to those in the first and second embodiments will be omitted, and mainly different parts will be described.

In the third embodiment, third engaging parts 33, 33 are further provided on the segment joint surface 20 side of the first engaging parts 31, 31 and second engaging parts 32, 32 of the first embodiment. It is. This point will be explained.
10 shows the female connector 4 and the male connector 5, FIG. 10(a) is a side view, FIG. 10(b) is a plan view, and FIG. 11 is the female connector 4 and the male connector. FIG. 12 is a side view in which the female connector 4 and the male connector 5 are connected.

In each of the pair of groove walls 410, 410, second groove wall protrusions 41a2, 41a2 protrude symmetrically toward the inside of the groove 41 on the opening 42 side than the first groove wall protrusions 41a1, 41a1. (Fig. 10(a)). The surfaces of the groove wall second protrusions 41a2, 41a2 on the inside of the groove 41 are planar.

The groove wall first protrusions 41a1, 41a1 and the groove wall second protrusions 41a2, 41a2 are integrally connected on the back side in the direction of the tunnel entrance from the tunnel shaft face, and form protrusions 41a12, 41a12. (Figure 10(b)).

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

The side surfaces of the second groove wall protrusions 41a2, 41a2 on the bottom 40 side are inclined toward the bottom 40 as they protrude and move away from the respective groove walls 410, 410 over the length L2 in the tunnel axis direction. Then, third engaged surfaces 413, 413 are formed (FIGS. 10(a) and 10(b)).
That is, the groove portion 41 is formed as a V-shaped inclined surface that slopes toward the opposite side of the opening portion 42 as it protrudes away from each groove wall portion 410, 410, and the mutual interval increases toward the segment joining surface. The third engaged surfaces 413, 413 are provided.

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

As shown in FIG. 10(b), the first engaged surfaces 411, 411 and the second engaged surfaces 412, 412 move toward the tunnel entrance direction (one direction (arrow B)) from the face in the tunnel axis direction. It is symmetrically inclined.
Further, the third engaged surfaces 413, 413 are arranged parallel to the first engaged surfaces 411, 411, and are connected to the second engaged surfaces 412, 412 in the tunnel axial direction from the face to the tunnel entrance (one direction). symmetrically inclined towards the arrow B)).

The plate-like part second protrusions 51a2, 51a2 protruding from both side surfaces of the plate-like part 51 are formed to have a length L4 shorter in the tunnel axis direction than those of the first embodiment (FIG. 10(b)). .
The side surfaces of the plate-shaped second protrusions 51a2, 51a2 opposite to the base end 50 form second engagement surfaces 512, 512 over the length L4 in the tunnel axis direction (FIG. 10(b)). .

The side surface of the second protrusion 51a2, 51a2 on the proximal end 50 side has a shape that extends over a length L4 in the tunnel axis direction and slopes toward the proximal end 50 as it protrudes from the side surface of the plate-like portion 51 and moves away from it. , forming third engaging surfaces 513, 513 (FIGS. 10(a) and 10(b)).
That is, the plate-shaped portion 51 is formed as a V-shaped inclined surface that protrudes from the side surface and slopes toward the proximal end 50 side as the distance increases, and the mutual interval increases toward the segment joining surface. It is provided with mating surfaces 413, 413.

As shown in FIG. 10(b), the first engagement surfaces 511, 511 and the second engagement surfaces 512, 512 are symmetrical from the face in the tunnel axis direction toward the tunnel entrance (one direction (arrow B)). is inclined to.
Further, the third engagement surfaces 513, 513 are arranged parallel to the first engagement surfaces 511, 511, and are connected to the second engagement surfaces 512, 512 in the tunnel axial direction from the face to the tunnel entrance (one direction (arrow B)). ) is symmetrically inclined towards the

The length L3 in the tunnel axial direction in which the first engaging surfaces 511, 511 are formed corresponds to the length L1 in the tunnel axial direction in which the first engaged surfaces 411, 411 are formed. The length L4 in the tunnel axis direction in which the mating surfaces 512, 512 and the third engaging surfaces 513, 513 are formed is the length L4 in which the second engaging surfaces 412, 412 and the third engaging surfaces 413, 413 are formed. This corresponds to the length L2 in the tunnel axial direction.

As shown in FIGS. 10, 11 and 12, when the plate portion 51 moves from the tunnel axial face toward the tunnel entrance (one direction (arrow B)) and enters the groove portion 41, the first engagement occurs. The surfaces 511, 511 engage with the first engaged surfaces 411, 411 to engage the first engaging portions 31, 31, and the second engaging surfaces 512, 512 engage with the second engaged surfaces 412, 412. The third engaging surfaces 513, 513 engage with the third engaged surfaces 413, 413 to form third engaging portions 33, 33.

a third engaged surface 413, 413 located closer to the opening 42 than the second engaged surface 412, 412, protruding from the groove wall portions 410, 410, and engaging with the plate-like portion 51; A third engaging surface 513 is located closer to the base end 50 than the second engaging surfaces 512, 512, is formed to protrude from the side surface of the plate-like portion 51, and engages with the third engaged surfaces 413, 413. , 513, and the third engaged surfaces 413, 413 are inclined toward the opposite side of the opening 42 as they move away from the groove walls 410, 410. The three engaging surfaces 513, 513 are inclined toward the proximal end 50 as they move away from the side surface of the plate-like portion 51. In other words, the third engaging portions 33, 33 are mutually inclined toward the segment joining surface 20. Since the third engaging portions 33, 33 form a V-shaped inclined surface with increasing distance and restrict the opening of the groove wall portions 410, 410, the groove wall portions of the female connector 4 can be closed at three locations. 410, 410 is regulated, the joint body is difficult to open, and joint strength is improved.

<Fourth embodiment>
A fourth embodiment of the present invention will be described below with reference to FIG. 13. Note that descriptions of parts similar to those in the first to third embodiments will be omitted, and mainly different parts will be described.

The fourth embodiment further includes third engaging parts 33, 33 on the segment joint surface 20 side of the first engaging parts 31, 31 and second engaging parts 32, 32 of the second embodiment. It is. This point will be explained.
FIG. 13 is a side view of the female connector 4 and male connector 5 of the segment joint 3 connected together.

The side surfaces on the opening 42 side of the second groove wall protrusions 41a2, 41a2, which are formed to protrude into the groove 41 from the pair of groove walls 410, 410, are shaped as they protrude away from the respective groove walls 410, 410. It has a shape that is inclined toward the segment joining surface 20 (opening 42) side, and forms third engaged surfaces 413, 413.
That is, the groove portion 41 is located closer to the opening 42 than the second engaged surfaces 412, 412, and as it protrudes away from the groove walls 410, 410, it slopes toward the opening 42 and toward the segment joining surface. Third engaged surfaces 413, 413 are formed as inverted V-shaped inclined surfaces whose mutual spacing is reduced.

Although not shown, the first engaged surfaces 411, 411 and the second engaged surfaces 412, 412 are provided in parallel from the face in the tunnel axis direction toward the tunnel entrance direction (one direction (arrow B)). There is. Further, the third engaged surfaces 413, 413 are inclined symmetrically with the second engaged surfaces 412, 412 from the face in the tunnel axis direction toward the tunnel entrance direction (one direction (arrow B)).

On both sides of the plate-like part 51 in the tunnel radial direction, there is a side surface that is closer to the base end part 50 than the second protrusions 51a2, 51a2 of the plate-like part, and closer to the segment joint surface 20 than the second protrusions 41a2, 41a2 of the groove wall part. Third plate-like protrusions 51a3, 51a3 are formed to protrude symmetrically toward the pair of groove walls 410, 410, respectively, so as to be located at . The surfaces of the third plate-like protrusions 51a3, 51a3 on the groove wall portions 410, 410 side are planar.
The plate-shaped portion third protrusions 51a3, 51a3 have a predetermined length along the tunnel axis direction, and the side surface opposite to the base end portion 50 extends from the face toward the tunnel entrance (one direction (arrow B)). It is provided so as to approach the segment joint surface 20 (not shown).

The side surfaces of the third protrusions 51a3, 51a3 of the plate-like portions opposite to the base end 50 have a shape that is inclined toward the side opposite to the base end 50 as the distance from the side surface of the plate-like portion 51 increases. Surfaces 513, 513 are formed.
That is, the plate-shaped part 51 is located closer to the base end 50 than the second engaging surfaces 512, 512, and as it protrudes from the side surface of the plate-shaped part 51 and moves away from it, it slopes toward the opposite side of the base end 50, and the segment Third engaging surfaces 513, 513 are provided which are formed as inverted V-shaped inclined surfaces whose mutual spacing decreases toward the joining surface.

Although not shown, the first engagement surfaces 511, 511 and the second engagement surfaces 512, 512 are provided in parallel from the face in the tunnel axis direction toward the tunnel entrance direction (one direction (arrow B)). Further, the third engagement surfaces 513, 513 are inclined symmetrically with the second engagement surfaces 512, 512 from the face in the tunnel axis direction toward the tunnel entrance direction (one direction (arrow B)).

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

a third engaged surface 413, 413 located closer to the opening 42 than the second engaged surface 412, 412, protruding from the groove wall portions 410, 410, and engaging with the plate-like portion 51; A third engaging surface 513 is located closer to the base end 50 than the second engaging surfaces 512, 512, is formed to protrude from the side surface of the plate-like portion 51, and engages with the third engaged surfaces 413, 413. , 513 are formed, and the third engaged surfaces 413, 413 are inclined toward the opening 42 as they move away from the groove walls 410, 410. The engaging surfaces 513 , 513 are inclined toward the opposite side of the base end 50 as they move away from the side surface of the plate-like portion 51 , that is, the third engaging portions 33 , 33 are mutually inclined toward the segment joining surface 20 . The third engaging portions 33, 33 form an inverted V-shaped inclined surface with a reduced interval, and restrict the opening of the groove walls 410, 410, so that the third engaging portions 33, 33 can close the groove walls of the female connector 4 at three locations. The opening of the parts 410, 410 is regulated, and the joint is also difficult to open, improving the strength of the joint.

<Fifth embodiment>
A fifth embodiment of the present invention will be described below with reference to FIGS. 14 and 15. Note that descriptions of parts similar to those in the first to fourth embodiments will be omitted, and mainly different parts will be described.

Similar to the first embodiment, this embodiment solves the problem that the female joint is easy to open, and also suppresses misalignment by guiding it to the center position within the tunnel radial joint, improving construction accuracy during segment assembly. It provides high quality segment joints.

FIG. 14 is a side view of the female connector and male connector of the segment joint connected, and FIG. 15(a) shows the connection procedure. b) shows the connection procedure when there is no center guide surface, and the right side is a view corresponding to the MM cross-sectional view in FIG. 14.

The first engaged surfaces 411, 411 formed on the groove wall first protrusions 41a1, 41a1 of the female connector 4 are formed on the plate-like first protrusions 51a1, 51a1 of the male connector 5. Similar to the first embodiment, the first engaging portions 31, 31 are formed with the first engaging surfaces 511, 511 as V-shaped inclined surfaces whose mutual spacing increases toward the segment joining surfaces. The opening of the groove wall portions 410, 410 is restricted.

The side surfaces of the first protrusions 41a1, 41a1 of the groove wall portions of the female connector 4 on the opening 42 side rise vertically from the respective groove wall portions 410, 410, and do not form second engaged surfaces.
In addition, the side surfaces of the first protrusions 41a1 and 41a1 on the opening 42 side of the groove wall portions are provided parallel to the tunnel face direction (one direction (arrow B)) from the face parallel to the tunnel axis direction (not shown). .

On both sides of the plate-like part 51 in the tunnel radial direction, there is a groove which is closer to the base end 50 than the first protrusions 51a1, 51a1 of the plate-like part and closer to the opening 42 of the first protrusions 41a1, 41a1 of the groove wall part. Plate-shaped portion guide protrusions 51b, 51b are formed to protrude symmetrically toward the pair of groove wall portions 410, 410, respectively, so as to be located at the same position.
The plate-shaped part guide protrusions 51b, 51b are formed to have a predetermined length in parallel to the tunnel axis direction, and the side surface on the base end 50 side and the side surface on the opposite side to the base end 50 are the side surfaces of the plate part 51. It stands vertically from.

The plate guide protrusions 51b, 51b are provided with center guide surfaces 51b1, 51b1 on the respective groove wall portions 410, 410 side surfaces.
The center guide surfaces 51b1 and 51b1 are surfaces parallel to the circumferential direction of the tunnel as shown in FIG. 14, and as shown in FIG. The plate-like portion guide protrusions 51b, 51b are inclined in such a way that the height thereof gradually decreases.

The highest portions of the center guide surfaces 51b1, 51b1 are set higher than the height of the plate-like first protrusions 51a1, 51a1 (FIG. 14).
The center guide surfaces 51b1 and 51b1 are provided closer to the base end portion 50 of the plate-like portion 51 than the first engaging portions 31 and 31 are.

As shown in FIG. 15(a), when the male connector 5 is moved from the tunnel axial face toward the tunnel entrance (one direction (arrow B)) and enters the groove 41 of the female connector 4, The clearance between the plate-shaped guide protrusions 51b, 51b and the groove walls 410, 410 gradually becomes narrower as you go deeper, which means that the male connector 5 is placed at the center position inside the groove 41 of the female connector 4 ( By guiding the tunnel to the center position in the radial direction of the tunnel, the amount of eccentricity, which is a deviation, is suppressed, and the first engaged surfaces 411, 411 and the first engaging surfaces 511, 511 are engaged at the center position, and the groove It is possible to more stably prevent the wall portions 410, 410 from opening, and form a segment joint with high construction accuracy and quality during segment assembly.

FIG. 15(b) is a side view when the male connector 5 without the plate guide protrusions 51b, 51b is inserted in the tunnel axial direction and connected to the female connector 4.
In such a case, when the male connector 5 penetrates into the female connector 4, a large amount of eccentricity T occurs in the male connector 5 with respect to the center position inside the groove 41 of the female connector 4. However, the clearance is biased, and the first engaged surfaces 411, 411 and the first engaging surfaces 511, 511 are engaged with each other off center, making it unstable to prevent the groove walls 410, 410 from opening. becomes.

<Sixth embodiment>
A sixth embodiment of the present invention will be described below with reference to FIG. 16. Note that descriptions of parts similar to those in the first to fifth embodiments will be omitted, and mainly different parts will be described.

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

The plate-like part first protrusions 51a1, 51a1 (plate-like part guide protrusions 51b, 51b) are provided with center guide surfaces 51b1, 51b1 on the surfaces on the respective groove wall parts 410, 410 side.
The center guide surfaces 51b1, 51b1, like the center guide surfaces 51b1, 51b1 of the fifth embodiment, are surfaces parallel to the circumferential direction of the tunnel, and are from the face in the tunnel axis direction to the tunnel entrance (one direction (arrow B)). ), the height of the plate-shaped part first protrusions 51a1, 51a1 (plate-shaped part guide protrusions 51b, 51b) gradually decreases.

The center guide surfaces 51b1, 51b1 are provided on the opposite side of the base end portion 50 of the plate-like portion 51 from the first engaging portions 31, 31.
In this embodiment, since the plate-like part first protrusions 51a1, 51a1 have the function as the plate-like part guide protrusions 51b, 51b, there is no need to separately provide the plate-like part guide protrusions 51b, 51b. A simple structure can be formed.

[Other variations]
The present invention is not limited to the embodiments described above. Examples include the following:

In this embodiment, the present invention is employed in a segment joint that connects segment pieces adjacent to each other in the circumferential direction of a tunnel, but the present invention is not limited thereto, and can also be employed in a segment joint between rings.
Further, the present invention is not limited to moving in the axial direction of the tunnel to engage the joint, but may also be applied to moving in the radial direction of the tunnel to engage the joint. In this case, the tunnel radial direction corresponds to one direction in the present invention.

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

Each technical matter in any embodiment may be applied to other embodiments to form an example.

For example, the plate-shaped part guide protrusion 51b including the center guide surfaces 51b1, 51b1 of the fifth embodiment is further provided closer to the base end 50 than the plate-shaped part second protrusions 51a2, 51a2 of the first embodiment. You can do it like this.
Further, for example, the plate-like portion third protrusions 51a3, 51a3 of the second embodiment may have the function of the plate-like portion guide protrusions 51b, 51b having the center guide surfaces 51b1, 51b1.

1 Shield tunnel 2 Segment 20 Segment joint surface 20a One joint surface 20b Other joint surface 21 Segment ring 22 Inter-ring joint 23a Recessed portion 3 Segment joint 31 First engaging portion 32 Second engaging portion 33 Third engaging portion 4 Female connector 40 Bottom 41 Groove 410 Groove wall 411 First engaged surface 412 Second engaged surface 413 Third engaged surface 41a1 Groove wall first protrusion 41a2 Groove wall second protrusion 42 Opening on segment joint surface side 5 Male connector 50 Base end 51 Plate portion 511 First engagement surface 512 Second engagement surface 513 Third engagement surface 51a Plate portion protrusion 51a1 Plate portion first Protrusion 51a2 Plate-shaped part second protrusion 51a3 Plate-shaped part third protrusion 51b Plate-shaped part guide protrusion 51b1 Center guide surface 6 Anchor part

Claims (4)

a female connector having a bottom portion, a pair of groove walls and an opening on the segment joining surface side and having a groove formed along one direction; and a female connector protruding from a base end portion on the segment joining surface side, a male connector having a plate-shaped portion that moves along the groove and engages with the groove inside the groove,
a first engaged surface that is formed to protrude from the groove wall portion and engages with the plate-like portion;
a first engagement surface that is formed to protrude from a side surface of the plate-shaped section and that engages with the first engaged surface, a first engagement section being formed;
The first engaged surface is inclined toward the opposite side of the opening as it moves away from the groove wall,
The first engagement surface is inclined toward the proximal end as it moves away from the side surface of the plate-shaped portion,
The first engaging portion regulates opening of the groove wall portion,
The plate-shaped part includes a plate-shaped part guide protrusion formed to protrude from a side surface, and is provided on the plate-shaped part guide protrusion, and when moving in the one direction, the plate-shaped part is moved inside the groove part. A segment joint characterized by comprising a center guide surface that guides the center. The segment joint according to claim 1, wherein the center guide surface is formed so that the height thereof gradually decreases along the one direction. The segment joint according to claim 1 or 2, wherein the center guide surface is provided closer to the proximal end than the first engaging portion. The segment joint according to claim 1 or 2, wherein the center guide surface is provided on a side opposite to the base end portion from the first engaging portion.

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