JP2020197100A - Segment ring joint, segment, and segment assembly method - Google Patents

Abstract

To efficiently correct segment rolling with a simple structure.SOLUTION: A male joint 3 has a male pin 32 protruding from a male joint surface 13. A female joint 2 comprises: a housing 4 exposed on a female joint surface 12; a joining piece 5 that is detachably provided inside the housing 4 and has a pin fitting hole for fitting the male pin 32; and a piece holding member 6 that holds and fixes the joining piece 5 from the outside of the female joint surface 12 while being inserted inside the housing 4. The piece holding member 6 provides a segment ring joint having a configuration in which any one of a concentric holding member that aligns a first central shaft C1 of the housing 4 with a second central shaft C2 of the pin fitting hole of the joining piece 5 and an eccentric holding member in which the first central axis C1 and the second central axis C2 are displaced in a tunnel circumferential direction is selected.SELECTED DRAWING: Figure 2

Description

The present invention relates to segment ring joints, segments, and segment assembly methods.

Conventionally, in the shield method, a tunnel lining body is constructed by assembling arc-shaped segments for one round (1 ring) of the tunnel cross section with an elector together with excavation. At this time, the previously assembled segment and the later assembled segment may be rolled so as to be displaced from each other in the circumferential direction. The rolling that occurs in such an assembled segment is accumulated according to the extension of the tunnel due to the continuous rolling in the same circumferential direction, even if the rolling is as small as several millimeters for each ring. It will be a big gap.

In particular, in shield tunnels for roads and railways, insert metal fittings and protrusions are provided in advance on the segment itself in order to install equipment by internally constructing floor slabs, lighting, ventilation fans, etc. that will be installed after the segment assembly is completed. You need to keep it. Then, it is important at which position in the circumferential direction the insert metal fittings, protrusions, etc. are located after the segment is assembled, and if rolling accumulates and a large deviation occurs, a problem will occur.

Therefore, when constructing a tunnel by the shield method, for example, by using a rolling correction segment as shown in Patent Document 1, a mechanism for correcting the rolling or absorbing the deviation in the member to be installed is provided. It was necessary to use it.

Japanese Unexamined Patent Publication No. 2008-2155

However, when a segment for rolling correction is used, it is impossible to correct it in units of several millimeters due to the limitation of the segment structure, and it is possible to correct a large deviation of about 20 mm to several tens of mm in one ring at a time. It had to be done, and it was difficult to secure the correction accuracy.
Further, it takes a lot of labor to adjust the position at the time of installing the member, and in the case of the precast member, the structure may be restricted, so that there is room for improvement in that respect.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a segment ring joint, a segment, and a segment assembly method capable of efficiently correcting the rolling of a segment by a simple structure. ..

In order to achieve the above object, the segment ring joint according to the present invention has a male joint provided on the first ring joint surface of one segment joined between the segment rings and the male joint joined to the male joint. A segment ring joint provided with a female joint provided on the second ring joint surface of the segment, wherein the male joint has a male pin protruding from the first ring joint surface. The female joint includes a housing exposed on the joint surface between the second rings, a joint piece that is detachably provided inside the housing and has a pin fitting hole for fitting the male pin. A top holding member for holding and fixing the joining piece from the outside of the joint surface between the first rings while being inserted inside the housing is provided, and the top holding member includes a first central axis of the housing and the said. Either a concentric holding member that matches the second central axis of the pin fitting hole of the joint piece or an eccentric holding member in which the first central axis and the second central axis are displaced in the circumferential direction of the tunnel. It is characterized in that one of them is selected.

In order to achieve the above object, the segment according to the present invention is a segment provided with the above-mentioned segment ring joint, and the male joint is provided on the first ring joint surface on the tunnel entrance side in the tunnel traveling direction. The female joint is characterized in that it is provided on the joint surface between the second rings on the face side in the direction of travel of the tunnel.

In order to achieve the above object, the segment assembly method according to the present invention is a segment assembly method for correcting the rolling of the segment described above, and the female mold provided on the joint surface between the second rings in the existing segment. A step of mounting the eccentric holding member whose second central axis is eccentric in a direction opposite to the direction deviated in the tunnel circumferential direction together with the joining piece inside the housing of the joint, and a step of eccentricity by the eccentric holding member. It is characterized by having a step of fitting the male pin of the male joint provided on the joint surface between the first rings in the segment to be assembled to the pin fitting hole of the cored joint piece. There is.

In the present invention, the concentric pressing member and the eccentric pressing member can be replaced with respect to the housing. That is, when returning the rolling of the segment, the second central axis of the joining piece is mounted inside the housing while the joining piece is held by the eccentric holding member eccentric in the tunnel circumferential direction in the returning direction. Is arranged at a position eccentric with respect to the first central axis of the housing in the direction of returning the rolling. As a result, the male pin of the male joint is fitted into the pin fitting hole of the joint piece eccentric in the tunnel circumferential direction, so that the segment to be assembled is eccentric with respect to the existing segment. Can only be rotated in the circumferential direction of the tunnel. That is, the segment to be assembled can be rotationally moved in the direction of returning the rolling with respect to the existing rolling segment ring.

As described above, in the present invention, the joining piece can be eccentric and the rolling can be controlled by attaching the eccentric holding member corresponding to the amount of rolling generated to be corrected. When rolling control is not required, a concentric holding member is attached to the housing and arranged so that the second central axis of the joining top and the first central axis of the housing are coaxial with each other, and the segments between the rings are separated from each other. Just assemble.
Then, in the present invention, rolling can be modified by a simple structure in which an appropriate top holding member (concentric holding member or eccentric holding member) is selected and a joining piece is attached to the housing of the female joint. it can.

Therefore, in the present invention, by controlling the rolling of the segment during the construction of the shield tunnel, a part of the internal construction such as the floor slab, the lighting, and the ventilation fan to be installed after the completion of the segment assembly is integrally attached at the time of segment production. Can be left.
In addition, since insert metal fittings and protrusions for internal construction of post-construction can be arranged at fixed positions as designed, precasting of side walls and the like becomes easy, and installation of the members becomes easy. ..

Further, in the segment ring joint according to the present invention, it is preferable that the frame holding member is provided with a locking portion that locks the housing and regulates rotation with respect to the housing.

In this case, since the top holding member is attached to the housing by the locking portion, it is possible to restrict the top holding member from rotating with respect to the housing. Therefore, when the eccentric pressing member is used, the eccentric direction of the pin fitting hole of the joining piece pressed by the eccentric pressing member does not deviate from the tunnel circumferential direction, and the rolling can be corrected with high accuracy.

According to the inter-segment ring joint, the segment, and the segment assembly method of the present invention, the rolling of the segment can be efficiently corrected by a simple structure.

It is a perspective view which showed the state which the segment provided with the segment ring joint by the Embodiment of this invention is assembled during shield excavation. It is a horizontal sectional view which shows the segment before joining of the segment ring joint. It is a horizontal sectional view which shows the segment after the joint between segment rings. It is an exploded perspective view which shows the structure of the male type joint and the female type joint. It is a figure which fixed the joint piece with the concentric holding member of a female joint, (a) is a side sectional view, (b) is the view taken along the line AA shown in (a). It is a vertical cross-sectional view which shows the state before pressing the joint piece by the piece holding member. It is the figure which fixed the joint piece with the eccentric holding member of a female joint, (a) is a side sectional view, (b) is the BB line arrow view shown in (a). It is a figure which fixed the joint piece with the eccentric holding member of a female joint, (a) is a side sectional view, (b) is the view taken along the line CC shown in (a). It is a side view which shows the state which corrected the rolling of a segment.

Hereinafter, the segment ring joint, the segment, and the segment assembly method according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the segment ring joint according to the present embodiment joins segments 10 and 10 between rings in a circular segment 10 assembled in the machine together with excavation by a shield excavator S having a circular cross section by a shield method. It is a joint for

The segment 10 is a concrete segment having an arcuate plate shape in the present embodiment.
Here, in the segment 10, both end faces in the tunnel circumferential direction are referred to as circumferential joint surfaces 11, and the end faces on the face side of the tunnel traveling direction X1 among the end faces between the rings are female joint surfaces 12 (joint surfaces between the second rings). ), Which will be described later, is provided, and the end surface on the tunnel entrance side is referred to as a male joint surface 13 (joint surface between the first rings), and a male joint 3 which is described later is provided. As shown in FIGS. 2 and 3, the female joint surface 12 and the male joint surface 13 are provided with a segment ring joint 1 capable of joining each other.

As shown in FIGS. 2 and 3, the segment ring joint 1 is joined to the female joint 2 provided on the female joint surface 12 of one segment 10A to be joined between the segment rings and the female joint 2. It is provided with a male joint 3 provided on the male joint surface 13 of the other segment 10B. A plurality of segment ring joints 1 are provided in the one-piece segment 10 in the tunnel circumferential direction X2 (see FIG. 1).
A female joint 2 is provided on the female joint surface 12. A male joint 3 is provided on the male joint surface 13.

The male joint 3 includes a male fixing shaft portion 31 and a male pin 32 integrally provided on the male fixing shaft portion 31 and protruding from the male joint surface 13. The male-side fixing shaft portion 31 is provided with a fixing expansion portion 312 at one end 311a of the pin body 311 and is embedded in concrete 14 so that the fixing expansion portion 312 is located inward from the male joint surface 13. .. The pin body 311 is inserted through a rubber cylinder 313. The male pin 32 has a circular cross section and is coaxially provided on the other end 311b of the pin body 311.

The female joint 2 is embedded in the concrete 14 of the segment in a state of being exposed to the female joint surface 12. As shown in FIGS. 4, 5 (a), 5 (b), and 6, the female joint 2 includes the female fixing shaft portion 21, the housing 4 exposed to the female joint surface 12, and the housing 4. A joint piece 5 that is detachably provided inside via a spring member 50 and for inserting the male pin 32 of the male joint 3, and a joint piece 5 that is inserted inside the housing 4 and is inserted into the female joint surface 12 A top holding member 6 that is held and fixed from the outside of (see FIG. 3) and a lid member 7 that is locked to the housing 4 on the female joint surface 12 side of the top holding member 6 are provided.

As shown in FIGS. 3 and 4, the female fixing shaft portion 21 is provided with a fixing expansion portion 212 at one end 211a of the pin body 211. A male screw 211b is formed on the other end of the pin body 211. The housing 4 is engaged with the male screw 211b by screwing. In the female side fixing shaft portion 21, the housing 4 is attached to the female screw 211b, the fixing expansion portion 212 is located inward from the female joint surface 12, and the opening end 4a of the housing 4 is on the female joint surface 12. It is buried in concrete 14 so as to be flush with each other.

In the housing 4, as shown in FIGS. 5, 7, and 8, the large-diameter cylinder 41 and the small-diameter cylinder 42 are coaxially arranged along the axis. Inside the large-diameter cylinder 41, a joining piece 5 arranged coaxially with the first central axis C1 or a joining piece 5 arranged at a position eccentric in the tunnel circumferential direction is detachably housed. It has become. A female screw 41a into which the lid member 7 is screwed is formed on the inner surface of the large-diameter cylinder 41 on the opening side.
Further, a female screw 42a is formed on the inner surface of the small diameter cylinder 42, and the male screw 211b of the pin body 211 of the female side fixing shaft portion 21 is screwed into the female screw 42a of the small diameter cylinder 42.

Inside the housing 4, a step portion 43 is provided in which an upper step surface 43a and a lower step surface 43b are formed at a connecting portion between the large diameter cylinder 41 and the small diameter cylinder 42. As shown in FIG. 6, a spring member 50 made of a disc spring is arranged on the lower surface 43b of the step portion 43. The joining piece 5 housed in the large-diameter cylinder 41 is positioned in a state of being pressed against the lower surface 43b by the piece holding member 6 via the spring member 50, and its movement in the insertion direction is restricted.

Further, as shown in FIG. 5B, a pair of locking holes 44 are formed on the upper surface 43a of the step portion 43 at intervals in the circumferential direction E that orbits around the first central axis C1. There is. The pair of locking holes 44 are arranged at a pitch of 180 ° in the circumferential direction E.

As shown in FIGS. 4 and 5A, the joining piece 5 is formed in a truncated cone shape with the second central axis C2 as the central axis, and the male pin of the male joint 3 is formed along the second central axis C2. A pin fitting hole 51 into which the 32 can be fitted is provided. The joining piece 5 is arranged so that the end portion (tip surface 5a) on the large diameter side in the direction of the second central axis C2 faces the back side (step portion 43 side) of the housing 4 and is held by the frame holding member 6. The position of the second central axis C2 in the housing 4 is determined by.

The outer peripheral surface 5b of the joining piece 5 is formed with a tapered surface having a large diameter from one side to the other in the direction of the second central axis C2. A plurality of slits 5c (see FIG. 4) are formed on the outer peripheral surface 5b of the joining piece 5 at intervals in the circumferential direction. These slits 5c extend from one end (the end on the lid member 7 side) in the direction of the first central axis C1 toward the other, and extend from the other end (the end on the spring member 50 side) toward one side. And are arranged alternately in the circumferential direction. The joining piece 5 can be expanded or contracted in the radial direction by forming a plurality of slits 5c.

The joining piece 5 is arranged at a position where the second central axis C2 of the pin fitting hole 51 coincides with the first central axis C1 of the housing 4 when held by the concentric holding member 6A described later (FIG. 5). (A), (b)). Further, when the joining piece 5 is held by the eccentric pressing member 6B described later, the second central axis C2 of the pin fitting hole 51 is displaced from the first central axis C1 of the housing 4 in the tunnel circumferential direction. Positioned (see (see FIGS. 7 (a), (b), 8 (a), (b)).

As shown in FIGS. 4, 5 (a), 5 (b), and 6, the frame holding member 6 can be fitted inside the large diameter cylinder 41 of the housing 4, and the joint piece 5 is coaxially fitted. It is a tubular member having a housing hole 61. The accommodating hole 61 is formed with a tapered surface that gradually increases in diameter toward the insertion direction into the housing 4. The outer diameter of the frame holding member 6 coincides with the inner diameter of the large diameter cylinder 41 of the housing 4. The frame holding member 6 is in close contact with the large diameter cylinder 41 in a state of being fitted into the large diameter cylinder 41.

Further, as shown in FIG. 6, the frame holding member 6 is pushed into the insertion direction together with the joining piece 5 by tightening the lid member 7 to a predetermined position with respect to the female screw 41a of the large diameter cylinder 41 of the housing 4. It is fixed with. At this time, since the spring member 50 is interposed between the step portion 43 (lower step surface 43b) of the housing 4 and the joining piece 5, the joining piece 5 pressed in the insertion direction by the piece holding member 6 is a spring member. In a state of being urged by 50, it is sandwiched between the frame holding member 6 and the movement in the second central axis C2 direction is suppressed. The diameter of the joining piece 5 is expanded when the male pin 32 is inserted, and the outer peripheral surface 5b of the joining piece 5 is fixed in contact with the accommodating hole 61 (described later) of the piece holding member 6.

Here, the action of the joining piece 5 when the male pin 32 of the male joint 3 is inserted into the female joint 2 and joined will be specifically described. First, when the male pin 32 is inserted inside the joint piece 5 of the female joint 2, the male pin 32 comes into contact with the pin fitting hole 51 of the joint piece 5 and the joint piece 5 is pushed to the back side. At this time, the spring member 50 is compressed by the pressed joining piece 5, and a slight gap is formed between the joining piece 5 and the piece holding member 6. The formed gap becomes a space that allows the diameter of the joining piece 5 to be expanded. Therefore, the male pin 32 is inserted while pushing the joining piece 5 open, and is in a joined state. When a force in the pulling direction acts on the male pin 32, the joining piece 5 is held down by the piece holding member 6 and the movement in the pulling direction is restricted, so that the male pin 32 has a pulling resistance force. It acts to prevent the male pin 32 from being pulled out.

The frame holding member 6 includes a concentric holding member 6A (see FIG. 5A) that aligns the first central shaft C1 of the housing 4 with the second central shaft C2 of the pin fitting hole 51 of the joining piece 5. An eccentric holding member 6B (see FIGS. 7 (a) and 8 (a)) in which the 1 central axis C1 and the 2nd central axis C2 are deviated from each other in the circumferential direction of the tunnel and are eccentric is provided. When the coma pressing member 6 is used as the female joint 2, either the concentric pressing member 6A or the eccentric pressing member 6B is selected.

As shown in FIG. 5A, the concentric holding member 6A has a second central axis C2 of the joining piece 5 coaxially accommodated with the accommodating hole 61 in a state of being fitted into the large diameter cylinder 41 of the housing 4. It coincides with the first central axis C1 of the housing 4.
As shown in FIGS. 7 (a) and 8 (a), the eccentric holding member 6B is a joint piece 5 that is accommodated coaxially with the accommodating hole 61 in a state of being fitted into the large diameter cylinder 41 of the housing 4. The second central axis C2 is configured to be eccentric with respect to the first central axis C1 of the housing 4 by, for example, 2 mm on both sides in the tunnel circumferential direction. In FIGS. 7A and 7B, the second central axis C2 is displaced upward on the paper surface from the first central axis C1 and is eccentric. In FIGS. 8A and 8B, the second central axis C2 is displaced downward on the paper surface from the first central axis C1 and is eccentric.

The tip portion 6a of the frame pressing member 6 is provided with a locking protrusion 62 (locking portion) to be inserted into each of the pair of locking holes 44 formed in the step portion 43 of the housing 4. As a result, the frame holding member 6 is restricted from rotating around the first central axis C1 with respect to the housing 4 in a state where the pair of locking protrusions 62 are locked in the locking holes 44. As the locking protrusion 62, as shown in FIG. 7A, even if a separate pin shape inserted into the locking hole 6b formed in the tip portion 6a of the frame holding member 6 is adopted. Good.

As shown in FIGS. 5A and 6, the lid member 7 has a through hole 71, and a male screw 7a screwed into the female screw 41a of the housing 4 is formed on the outer peripheral surface thereof. The lid member 7 presses the top holding member 6 in the insertion direction while being tightened to the housing 4, and the lid member 7 is housed in the housing 4 in a state where the top surface 7c is flush with the female joint surface 12.

The through hole 71 is provided coaxially with the first central axis C1 in a state of being tightened in the housing 4. The inner diameter of the through hole 71 is set to be at least larger than the inner diameter of the pin fitting hole 51 of the joining piece 5 by the amount of eccentricity of the pin fitting hole 51 of the joining piece 5 fixed to the eccentric holding member 6B. As a result, even when the joining piece 5 is fixed at the eccentric position, the male pin 32 of the male joint 3 can be inserted through the through hole 71 of the lid member 7.

As described above, the concentric pressing member 6A and the eccentric pressing member 6B are selectively detachably provided with respect to the housing 4.
As shown in FIG. 9, when the rolling of the existing segment 10A is modified, the eccentric pressing member 6B corresponding to the amount of rolling generated to be modified can be accommodated to control the rolling. In FIG. 9, the position of the segment of reference numeral P0 indicates a normal position that is not rolling. On the other hand, the position of the segment of reference numeral P1 indicates a rolling position. That is, the segment to be assembled by accommodating the eccentric holding member 6B eccentric in the direction of returning the rolling in the housing 4 together with the joining piece 5 and fitting the male pin 32 of the male joint 3 into the pin fitting hole 51. Rolling can be returned by the amount of eccentricity (for example, 2 mm) of the eccentric holding member 6B with respect to the existing segment 10A in which 10B is assembled earlier.

When correcting the rolling, it is preferable not to correct the rolling only by assembling the segment once (1 ring), but to correct it step by step by assembling the segment a plurality of times (multiple rings). For example, in the case of rolling of 20 mm, the rolling can be corrected by continuously using the eccentric holding member 6B having an eccentric amount of 2 mm for 10 rings, and the rolling can be returned to the normal position.

Next, the operation of the segment ring joint, the segment, and the segment assembly method described above will be described in detail with reference to the drawings.
In the present embodiment, as shown in FIGS. 5 to 8, the concentric pressing member 6A and the eccentric pressing member 6B can be replaced with respect to the housing 4. That is, when returning the rolling of the segment 10, the joining piece 5 is mounted inside the housing 4 while the joining piece 5 is held by the eccentric holding member 6B eccentric in the tunnel circumferential direction in the returning direction. The second central axis C2 of the housing 4 is arranged at a position eccentric with respect to the first central axis C1 of the housing 4 in the direction of returning the rolling. As a result, the male pin 32 of the male joint 3 is fitted into the pin fitting hole 51 of the joining piece 5 eccentric in the tunnel circumferential direction X2, so that the segment 10B to be assembled is eccentric with respect to the existing segment 10A. It can be rotated in the tunnel circumferential direction X2 by the amount of eccentricity of the joined piece. That is, the segment 10B to be assembled with respect to the existing rolling segment 10A can be rotationally moved in the direction of returning the rolling.

As described above, in the present embodiment, the joining piece 5 can be eccentric and the rolling can be controlled by attaching the eccentric pressing member 6B corresponding to the amount of rolling generated to be corrected. When rolling control is not required, the concentric holding member 6A is attached to the housing 4 and arranged so that the second central axis C2 of the joining piece 5 and the first central axis C1 of the housing 4 are coaxial. The segments between the rings may be assembled together.
Then, in the present embodiment, a simple structure in which an appropriate top holding member 6 (concentric holding member 6A or eccentric holding member 6B) is selected and the joining piece 5 is attached to the housing 4 of the female joint 2. Can correct rolling.

Therefore, in the present embodiment, by controlling the rolling of the segment 10 during the shield tunnel construction, a part of the internal construction such as the floor slab, the lighting, and the ventilation fan to be installed after the segment assembly is completed is integrated at the time of segment production. Can be attached.
In addition, since insert metal fittings and protrusions for internal construction of post-construction can be arranged at fixed positions as designed, precasting of side walls and the like becomes easy, and installation of the members becomes easy. ..

Further, in the present embodiment, since the frame pressing member 6 is attached to the housing 4 by the locking protrusion 62, it is possible to restrict the coma pressing member 6 from rotating with respect to the housing 4. Therefore, when the eccentric pressing member 6B is used, the eccentric direction of the pin fitting hole 51 of the joining piece 5 pressed by the eccentric pressing member 6B does not deviate from the tunnel circumferential direction, and the rolling is corrected with high accuracy. Can be done.

As described above, in the inter-segment ring joint, the segment, and the segment assembly method according to the present embodiment, the rolling of the segment 10 can be efficiently modified by a simple structure.

Although the embodiment of the segment ring joint, the segment, and the segment assembly method according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately changed without departing from the spirit thereof. is there.

For example, in the present embodiment, the locking protrusion 62 of the frame holding member 6 is fitted into the locking hole 44 of the housing 4, so that the rotation with respect to the housing 4 is restricted, but the present invention is limited to this. It is also possible to omit the locking portion due to such uneven fitting.

Further, the configuration such as the shape and size of the female joint 2 and the male joint 3 and the amount of eccentricity of the eccentric holding member 6B can be appropriately set.

Further, in the present embodiment, as the female joint 2, the joint piece 5 is pressed and fixed by the piece pressing member 6 via the spring member 50, but such a spring member 50 can be omitted. ..
Further, in the present embodiment, the frame pressing member 6 is pressed in the insertion direction by tightening the lid member 7, but the lid member 7 is not limited to the lid member 7, and other members may be used. For example, if the frame holding member itself can be fixed at a predetermined position in the insertion direction, the lid member may be omitted.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 Segment ring joint 2 Female joint 3 Male joint 4 Housing 5 Joining piece 6 Frame holding member 6A Concentric holding member 6B Eccentric holding member 7 Lid member 10 Segment 10A Existing segment 10B Segment to be assembled 12 Female joint surface ( 2nd ring joint surface)
13 Male joint surface (joint surface between first rings)
14 Concrete 32 Male pin 44 Locking hole 50 Spring member 51 Pin fitting hole 62 Locking protrusion (locking part)
C1 1st central axis C2 2nd central axis

Claims (4)

A male joint provided on the first ring joint surface of one segment joined between the segment rings, and a female joint provided on the second ring joint surface of the other segment joined to the male joint. It is a segment ring joint equipped with
The male joint has a male pin protruding from the joint surface between the first rings.
The female joint
The housing exposed on the joint surface between the second rings and
A joining piece that is detachably provided inside the housing and has a pin fitting hole for fitting the male pin.
A top holding member for holding and fixing the joining piece from the outside of the joint surface between the first rings while being inserted inside the housing is provided.
The top holding member includes a concentric holding member that aligns the first central axis of the housing with the second central axis of the pin fitting hole of the joint piece, and the first central axis and the second central axis. An eccentric holding member displaced in the circumferential direction of the tunnel, and a segment ring joint characterized in that one of them is selected. The inter-segment ring joint according to claim 1, wherein the top holding member is provided with a locking portion that locks the housing and regulates rotation with respect to the housing. A segment including the segment ring joint according to claim 1 or 2.
The male joint is provided on the joint surface between the first rings on the wellhead side in the tunnel traveling direction.
The female joint is a segment characterized in that it is provided on the joint surface between the second rings on the face side in the direction of travel of the tunnel. A segment assembly method for modifying the rolling of the segment according to claim 3.
The eccentric holding member in which the second central axis is eccentric inside the housing of the female joint provided on the joint surface between the second rings in the existing segment in a direction opposite to the direction deviated in the tunnel circumferential direction. And the process of mounting with the joint piece
A step of fitting the male pin of the male joint provided on the joint surface between the first rings in the segment to be assembled into the pin fitting hole of the joining piece eccentric by the eccentric holding member. ,
A segment assembly method characterized by having.

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