JP2008069540A - Joint structure of segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the strength of joining segments together; to eliminate the risk of damage to a joint during the handling of the segment; and to make a structure simple and inexpensive. <P>SOLUTION: In this joint structure A of a segment, a male joint 2, which comprises a cylindrical supporting body 4 and a male connecting member 5 coaxially provided with an annular space 4e in between inside the cylindrical supporting body 4, is embedded in the jointing end 1a of one segment 1; a cylindrical female connecting member 7, which a tapered cylinder-shaped wedge member 8 split into a plurality of pieces is mounted on a fitting portion 7b with a plurality of slits 7f by means of an elastic ring 9, is fixed to a jointing end 1b of the other segment 1 in such a manner as to protrude from a jointing end surface 1b1. When the connecting member 7 and the wedge member 8 are fitted into the annular surface 4e in the jointing of the segments 1 and 1 are joined together, the connecting member 7 is fitted into the connecting member 5 so that a diameter can be enlarged. Concurrently with that, the wedge member 8 increases in diameter so as to be pressed against the inside of the cylindrical supporting body 4, and the wedge effect of the wedge member 8 makes the male joint 2 and female joint 3 firmly connected together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint structure for joining adjacent ones of segments such as a concrete segment used for lining a shield tunnel.

Conventionally, as a joint structure of this type of segment, the joint surface of one segment of a pair of adjacent joints has a tapered cylindrical portion protruding outward from the joint surface and tapered. A cylindrical male joint provided with a slit along the axial direction with an interval in the circumferential direction is embedded in the tapered tubular portion, and the bottom of the male joint is placed in the bottom of the recess provided on the joint surface of the other segment. A cylindrical female joint having a tapered hole part into which the tapered cylindrical part can be fitted is embedded in a state where the tip part is immersed in the recess from the joint surface, and when the segments are joined to each other, When the taper tube is pushed into the taper hole of the female joint, the diameter of the taper tube is reduced and fitted into the taper hole, so that the male joint and the female joint are connected. Is known (see, for example, Patent Document 1)
In addition, a male male joint with a shaft whose tip is recessed from the joint surface is provided in the recess formed in the joint surface of one segment, and the cylinder is formed around the cylinder in the recess formed in the joint surface of the other segment. A female joint comprising a plurality of engaging claws is provided by projecting the engaging claws outward from the joint surface, and when the segments are joined, the female joint is inserted into the recess of one segment. When the joint surfaces of the segments contact each other, the engagement head at the tip of the male joint is inserted into the engagement claw of the female joint and engages with the engagement claw. A mold joint and a female joint are known to be connected (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 9-221994 JP 2001-65299 A

  However, in the conventional segment joint structure, one of the male joint and the female joint protrudes outward from the joint surface perpendicular to the joint surface. When transporting from the construction site to the tunnel construction site and assembling it, the male joint or female joint protrudes from the joint surface and interferes with the work, or it can be used as a transportation means, other segments, or other equipment. There is a risk of collision and damage. In both cases, when the male joint and the female joint are connected, an annular space exists between the peripheral wall in the recess of the segment on the outside of the connecting portion, so that the joint segment When a large load is applied in the joint surface direction, the female joint may be deformed in the same direction, and there is a problem that the joint strength in the joint surface direction between the segments cannot be obtained sufficiently.

  The present invention has been made in view of the above circumstances, and it is possible to improve the joint strength between segments, and there is no risk of the joint being damaged during transportation of the segment, and the structure is simple and inexpensive. An object is to provide a joint structure.

In order to achieve the above-mentioned object, the joining structure of the segment according to the present invention is such that the joining surfaces of a pair of adjacent segments are abutted, and a male joint provided at the joining end of one segment and the joining end of the other segment A segment joint structure for joining the segments together by fitting a female joint provided in
The male joint includes a cylindrical support and a shaft-shaped male connecting member arranged on a coaxial line with an annular space inside the cylindrical support, and the outer ends thereof extend outward from the joint surface. It is fixed to the joining end of one segment so as not to protrude, and the female joint is smaller in diameter by a predetermined dimension than the outer diameter of the male connecting member, and the male connecting member is inserted. Cylindrical female connecting member with a possible insertion hole and a plurality of slits along the axial direction on the tip side spaced apart in the circumferential direction, and a tapered cylindrical shape with a tapered outer periphery Is attached to the outer peripheral portion on the distal end side of the female connecting member, and before the male connecting member is inserted into the insertion hole of the female connecting member, the maximum outer diameter is the inner diameter of the cylindrical support of the male joint. The female connecting member has a smaller diameter by a predetermined dimension, and the male connecting member is inserted into the insertion hole. A wedge member whose maximum outer diameter is larger than the inner diameter of the cylindrical joint of the male joint when the diameter is expanded in the diameter direction, and the wedge member is wound around the outer periphery of the wedge member and moved in the diameter direction of the wedge member. And an elastic ring that allows expansion and contraction, wherein the female connecting member protrudes outward from the joint surface to the joint end of the other segment and is fixed.

  In the present invention, when joining a pair of segments by abutting their joining surfaces, if the other segment is moved relative to one segment, the insertion hole of the female connecting member of the other segment is one The female connection member and the wedge member are pushed into and inserted into the annular space between the cylindrical support and the male connection member of one segment. To go. At that time, the distal end side of the female connecting member is enlarged and deformed by the male connecting member due to the effect of the slit, and the wedge member is enlarged and displaced accordingly, so that the outer peripheral surface of the wedge member is the cylindrical support. It is strongly pressed against the inner peripheral surface. Therefore, when the wedge member exerts a large wedge effect between the inner peripheral portion of the cylindrical support and the female coupling member, the male coupling and the female coupling are connected to the male coupling member and the female coupling. It will be firmly connected through fitting with a member.

In the joining structure of the segments, the female joint is fixed to the bottom of the recess provided at the joining end of the other segment, and the anchor bolt protruding into the recess with the tip positioned inside the joining surface is provided. It is preferable that the female connecting member is configured to be detachably connected to the anchor bolt by screwing the base end side of the female connecting member to the distal end portion of the anchor bolt.
In this way, the assembly set of the female coupling member and the wedge member of the female joint may be removed from the anchor bolt in advance and screwed to the anchor bolt immediately before joining the segments on the site. When the segment is transported, the assembly set protrudes from the joint surface of the segment and does not get in the way, and the assembly set is damaged by colliding with other members, or the assembly set collides. Accordingly, it is possible to reliably prevent the segment 1 from being cracked.

Further, in the joining structure of the segments, the male connecting member is located at a position where an outer end of the male connecting member is inward from the outer end of the cylindrical support by a predetermined dimension. A tapered chamfered portion having a diameter smaller than the diameter of the insertion hole of the female connecting member is preferably provided.
In this way, when the other segment is moved and joined to one segment, it is attached to the tip of the female connecting member of the other segment by the inner periphery of the cylindrical support of the one male joint. After the outer periphery of the wedge member is guided and aligned, the insertion hole of the female connecting member is fitted into the male connecting member, so that the axis of the male joint and the female joint is at the start of joining. Even if they are somewhat eccentric, the female joint can be smoothly connected to the male joint while correcting the eccentricity.

According to the joining structure of segments according to the present invention, in a state where the female joint of the other segment is pushed into the male joint of one segment and connected, the diameter of the male joint member of the male joint is the female joint. Since the inner diameter of the insertion hole of the female coupling member of the mold joint is set larger than the inner diameter of the female coupling member, when the male coupling member is fitted into the insertion hole of the female coupling member, the distal end portion of the female coupling member is deformed to expand. The wedge member mounted on the distal end portion is displaced in diameter, whereby the outer peripheral surface of the wedge member is strongly pressed against the inner peripheral surface of the cylindrical joint of the male joint. The wedge member exerts a large wedge effect between the peripheral portion and the female coupling member. Therefore, the male coupling and the female coupling are closely fitted with the male coupling member and the female coupling member. Can be firmly connected to each other. And since the fitting state of the male connection member and the female connection member can be firmly held by the cylindrical support, the connection between the male joint and the female joint in the axial direction and the direction orthogonal thereto is performed. Thus, the bonding strength between the segments can be improved.
Further, since the male joint and the female joint are a combination of a cylindrical member and a rod-shaped member, the joint structure is simple and can be manufactured easily and inexpensively.

Hereinafter, a joint structure for a segment according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1, 3 and 4 show a segment joint structure A according to an embodiment of the present invention. The joint structure A of this segment is one end side (a tuyere side in the axial direction of the tunnel, FIG. 4) of an arc-shaped concrete segment (hereinafter simply referred to as “segment”) 1 used for a shield tunnel covering body. And the male joint 2 fixed to the joint end 1a on the right end side) and the joint end 1b on the other end side (the wellhead side in the axial direction of the tunnel, the left end side in FIG. 4) of the segment 1 And a female joint 3 connected to the male joint 2.
The male joint 2 and the female joint 3 are provided in plural (two in the illustrated example) at intervals along the arc direction of the segment 1 (circumferential direction of the tunnel).

  The male joint 2 includes a bottomed cylindrical support 4 formed by fixing a bottom plate 4b to an inner end (left end in FIG. 1) of a cylindrical member 4a, and an axis line that matches the axis of the cylindrical support 4. A parallel shaft-shaped male connecting member 5 having an inner end fixed to the inside of the bottom plate 4b, and a plurality of male connecting members 5 which are arranged on the outer periphery of the cylindrical support 4 at intervals in the circumferential direction and fixed in the axial direction. Anchor rod F. The cylindrical support 4 has an axial direction oriented perpendicular to the joint surface 1a1 of the joint end 1a, and an outer end (right end in FIG. 1) 4d on the side of the opening 4c to the joint surface 1a1. It is embedded in the joining end portion 1a of the segment 1 in a state where it is immersed by a predetermined dimension from the joining surface 1a1 (so as not to protrude outward from the joining surface 1a1). An outer end (right end in FIG. 1) 5a opposite to the bottom 4b of the male connecting member 5 is set at a position closer to the bottom 4b side (inside) by a predetermined dimension than the outer end 4d of the cylindrical support 4. Has been. The annular space 4e surrounded by the cylindrical support 4 and the male connecting member 5 is open to the outside of the joint surface 1a until the segments 1 and 1 are joined.

  A tapered chamfered portion 5b is provided on the outer peripheral portion of the male connecting member 5 on the outer end side (the opening 4c side). The take-up portion 5b may be formed as an outwardly convex arcuate portion. In addition, a taper-shaped recess 1a2 that extends outward from the outer periphery of one end of the cylindrical support 4 is provided in the buried portion of the cylindrical support 4 at the joining end 1a of the segment 1 so as to open to the joining surface 1a1. ing. Note that the inside of the recess 1a2 may coincide with the inner periphery of the outer end of the cylindrical support 4 as indicated by a chain line h in FIG. Further, as is well known in the art, a sealing groove 1a3 for mounting a sealing material is provided at a position closer to the outer peripheral side (upper side in FIG. 1) of the segment 1 than the cylindrical support 4 on the joint surface 1a1. It is formed along one arc.

The female joint 3 includes an anchor bolt 6 embedded and fixed at the bottom of a recess 1b2 provided in the joint end 1b on the other end side of the segment 1 so as to open to the joint surface 1b1, and the anchor bolt 6 A female coupling member 7 detachably screwed into a male screw portion 6a on the distal end side protruding into the recess 1b2, and a tapered cylindrical shape mounted on the outer peripheral portion on the distal end side of the female coupling member 7 The wedge member 8 is provided.
The anchor bolt 6 is embedded in the bottom portion of the recess 1b2 on the head 6b side, the tip surface of the male screw portion 6a is located on the inner side of the joint surface 1b1 (slightly inserted into the recess 1b2), and the axial direction is It is provided perpendicularly to the joint surface 1b1.

The female connecting member 7 has a large-diameter fixing portion 7a on the base end side (right end side in FIG. 1) from a substantially axial center, and a distal end side (left end side in FIG. 1) smaller diameter than the fixing portion 7a. It is formed as a cylindrical member provided with an insertion hole 7c penetrating along the axial direction at the center. The diameter of the fixing portion 7a is slightly smaller than the inner diameter of the cylindrical support 4 of the male joint 2, and the diameter of the insertion hole 7c is that of the male connecting member 5 of the male joint 2. Although depending on the diameter, for example, the diameter is slightly smaller than the diameter of the male connecting member 5 so that the difference in diameter is 2 mm. The diameter of the outer end of the chamfered portion 5d of the male connecting member 5 is set to be smaller than the inner diameter of the insertion hole 7c of the female connecting member 7 by a predetermined dimension.
A female screw 7d is provided on the base end side of the insertion hole 7c, and the female connecting member 7 is arranged so that the female screw 7d is in contact with the bottom surface of the recess 1b2 until the base end of the female connecting member 7 abuts. It can be screwed into the male threaded portion 6a of the anchor bolt 7 so that its distal end protrudes outward from the joint surface 1b1 of the segment 1 and can be detachably connected to the anchor bolt 6 with its axial direction perpendicular to the joint surface 1b1. It is like that.

The protruding length of the female connecting member 7 from the joint surface 1b1 to the outside is such that when the joint surfaces 1a1 and 1b1 of the segments 1 and 1 are brought into contact with each other, the tip of the female connecting member 7 is the male joint 2 The cylindrical support 4 is set to be stopped at a position sufficiently away from the bottom plate 4b.
Furthermore, the fitting part 7b of the female connecting member 7 has a predetermined width formed by extending in the axial direction from the tip part to the step part 7e which is the boundary between the fitting part 7b and the fixing part 7a. A plurality of slits 7f (four in the illustrated example) are provided at predetermined intervals in the circumferential direction.
The wedge member 8 is formed of a material having high rigidity, and has a plurality of tapered cylinders (four in the illustrated example) in the circumferential direction with the outer peripheral portion 8a tapered on the tip side (left end side in FIG. 1). The divided surfaces 8b are abutted with each other, the inner peripheral portion 8c is brought into contact with the outer peripheral portion of the fitting portion 7b of the female connecting member 7, and the base end portion (right end portion in FIG. 1) is set to the female die. It is attached to the female connecting member 7 in contact with the step 7 e of the connecting member 7. In addition, the diameter (maximum diameter) of the wedge member 8 on the large diameter side is normal (before the male connecting member 6 is inserted into the insertion hole 7c of the female connecting member 7). When the male connecting member 6 is sufficiently inserted into the insertion hole 7c of the female connecting member 7 and expanded in the diameter direction by a diameter difference from the inner diameter, for example, by 1 mm, the inner diameter of the cylindrical support 4 is larger. The diameter difference is set to be increased by, for example, 1 mm.

The wedge member 8 is provided with an annular groove 8d having an arc-shaped cross section along the circumferential direction on the outer periphery on the base end side, and the annular groove 8d has a single diameter that can be expanded and contracted in the diameter direction. The annular elastic ring 9 is attached, and the elastic ring 9 presses and holds the wedge member 8 firmly against the outer peripheral portion of the fitting portion 7b. The wedge member 8 is formed to be shorter than the length of the fitting portion 7b, and the distal end thereof is located closer to the proximal end than the distal end portion of the fitting portion 7b.
The number of the slits 7f and the number of divisions of the wedge member 8 are not limited to four, but may be three or a plurality of five or more, and the number of the annular groove 8d and the elastic ring 9 is one. Not limited to the book, a plurality of wedge members 8 may be provided at intervals in the axial direction of the wedge member 8. The elastic ring 9 can be constituted by a rubber O-ring or a coil spring having a small diameter connected in a ring shape.
The annular groove 8 should be as deep as possible so that the outer periphery of the elastic ring 9 does not protrude so much toward the outer peripheral side of the wedge member 8. When the wedge member 8 is thick, the elastic ring 9 It is preferable to make the depth of the outer circumference of the ring so as to be immersed in the annular groove 8d. Further, on the joint surface 1b on the other end side of the segment 1, the seal groove 1a3 along the arc of the outer peripheral surface of the segment 1 is provided at a position facing the seal groove 1a3 of the joint surface 1a on the outer peripheral side from the recess 1b2. And a seal groove 1b3 having the same shape as that of FIG.

Next, a method of joining the segments 1 and 1 adjacent to each other in the circumferential direction of the tunnel by the segment joint structure A having the above configuration will be described.
First, with respect to the segment 1 of the well-end segment ring assembled on the left side in FIG. 1, the tuyere-side segment 1 positioned on the right side is operated to approach the male joint 2 in the segment 1 on the well-end side. The axis of the anchor bolt 6 of the tuyere side segment 1 is made to coincide with the axis of the male connecting member 5. The female connecting member 7 to which the wedge member 8 that has been removed from the anchor bolt 6 in advance when the segment 1 is transported is attached, the female screw 7d is connected to the recess 1b2 at the base end of the female connecting member 7. It is connected to the anchor bolt 6 by being screwed into the male screw portion 6a until it comes into contact with the bottom portion.
It should be noted that the seal material S is previously bonded to one of the seal grooves 1a3 and 1b3 of the segments 1 and 1 as in the conventional case.

  Next, the tuyere side segment 1 is moved in the direction indicated by the arrow B toward the well side segment 1 side, and the joining surface 1a1 of the well side segment 1 is connected to the joining surface 1b1 of the tuyere side segment 1. Make contact. In this process, the distal end portion of the female coupling member 7 and the distal end portion of the wedge member 8 subsequently enter the opening 4 c of the male joint 2 and then enter the insertion hole 7 c of the female coupling member 7. The distal end portion of the male connecting member 5 is fitted through a chamfered portion 5 b, and the fitting portion 7 b of the female connecting member 7 is expanded and deformed by the male connecting member 5 by this fitting. The amount of fitting with 5 is increased. At the same time, the wedge member 8 attached to the fitting portion 7b is fitted into the cylindrical support 4 of the male joint 2, and gradually expands with the diameter of the fitting portion 7b. While being pushed into the cylindrical support 4. Finally, as shown in FIG. 3, the female continuous member 7 and the wedge member 8 of the female joint 3 are forcibly inserted into the annular space 4 e of the male joint 2, and the fitting portion The male coupling member 5 is inserted into the insertion hole 7c of 7b, and the female coupling member 7 is press-fitted into the cylindrical support body 4 with the wedge member 8 interposed therebetween. 2 and the female joint 3 are connected, and the segments 1 and 1 are joined by abutting their joining surfaces 1a1 and 1b1.

  Thus, in the state where the male joint 2 and the female joint 3 are coupled, the diameter of the male coupling member 5 is set larger than the inner diameter of the insertion hole 7c of the female coupling member 7, When the male connecting member 5 is inserted into the insertion hole 7c of the female connecting member 7, the fitting portion 7 is expanded in diameter, and the wedge member 8 attached to the outer peripheral side of the fitting portion 7 is moved to its maximum. Since the outer diameter is displaced larger than the inside of the cylindrical support 4 and the outer peripheral surface of the wedge member 8 is pressed against and contacted (pressed) on the inner peripheral portion of the cylindrical support 4 of the male joint 2, the female A large wedge effect due to the taper occurs between the fitting portion 7 of the mold connecting member 7 and the inner peripheral portion of the cylindrical support 4, particularly on the large diameter side of the wedge member 8, so that the male connection of the male joint 2 is performed. The member 5 and the female coupling member 7 of the female joint 3 are tightly fitted in a tight fit, and this fitted state is the cylindrical support. It is held by the body 4. As a result, the male joint 2 and the female joint 3 are firmly connected in the axial direction and in the direction orthogonal thereto.

  In the above, the chamfered portion 5b is provided at the distal end portion of the male coupling member 5 of the male joint 2, and the outer peripheral portion of the wedge member 8 of the female joint 3 is formed in a tapered taper surface. Even if the female joint 3 is inserted with the male joint 2 in a slightly eccentric state, the female connecting member 7 is aligned by the wedge member 8 being aligned by the inner peripheral surface of the cylindrical support 4. Is smoothly inserted into the male connecting member 5, and the male joint 2 and the female joint 3 are coaxially connected to each other. For the same reason, the fitting tolerance between the inner diameter of the cylindrical support 4 or the outer diameter of the male connecting member 5 and the outer diameter of the insertion hole 7c or the wedge member 8 of the female connecting member 7 is strict. Therefore, it is easy to manufacture the components of the male joint 2 and the female joint 3 and assemble them to the segment 1.

  Further, the female coupling member 7 and the wedge member 8 of the female joint 3 are pushed into the annular space 4e between the inner peripheral portion of the cylindrical support 4 of the male joint 2 and the male coupling member 5, thereby enabling one-touch operation. The male joint 2 and the female joint 3 can be easily connected. Since the male joint 2 and the female joint 3 are not connected by bolts and nuts, it is not necessary to provide a bolt box for operating the bolts and nuts on the inner surface side of the joining end portions 1a and 1b of the segment 1. The inner surface of the segment 1 can be formed smoothly. Further, the assembly set of the female coupling member 7 and the wedge member 8 of the female joint 3 may be screwed and attached to the anchor bolt 6 immediately before joining the segments 1 and 1 at the site. The assembly set protrudes from the joint surfaces 1a1 and 1b1 of the segment 1 during transportation of the segment 1 and does not get in the way, and the assembly set may be damaged by colliding with other members. There is no possibility that the segment 1 is cracked by the collision.

  As described above, in the segment joint structure A according to the embodiment, the male joint 2 has a cylindrical support 4 and an annular space 4e inside the cylindrical support 4 with a space between the annular spaces 4e. A shaft-shaped male connecting member 5 arranged and fixed to the joint end 1a of one segment 1 so that they do not protrude outward from the joint surface 1a. The female joint 3 has an insertion hole 7c that is smaller in diameter by a predetermined dimension than the outer diameter of the male connecting member 5 and into which the male connecting member 5 can be inserted. A cylindrical female connecting member 7 provided with a plurality of slits 7d along the direction spaced apart in the circumferential direction, and a tapered tube with a tapered outer peripheral portion 8a is divided into a plurality in the circumferential direction, It is attached to the outer periphery of the fitting portion 7b of the female connecting member 7, and the maximum outer diameter is always the male type. When the female connecting member 7 is smaller in diameter than the inner diameter of the cylindrical support 4 of the hand 2 and the male connecting member 5 is inserted into the insertion hole 7c and expanded in the diameter direction, A wedge member 8 whose outer diameter is displaced more than the inner diameter of the cylindrical support 4 of the male joint 2, and an elastic ring that is wound around the outer periphery of the wedge member 8 and allows the wedge member 8 to expand and contract in the diameter direction. 9 and the female connecting member 7 is fixed to the joining end 1b of the other segment 1 by protruding outward from the joining surface 1b1.

Therefore, according to the segment joint structure A according to the embodiment, in the state where the female joint 3 of the other segment 1 is pushed into and connected to the male joint 2 of one segment 1, the male joint 2 2 is set larger than the inner diameter of the insertion hole 7c of the female connection member 7 of the female joint 3, so that the male connection member 5 is inserted into the insertion hole of the female connection member 7. When fitted into 7c, the fitting portion 7b at the tip of the female connecting member 7 is deformed to expand the diameter, and the wedge member 8 attached to the fitting portion 7b is displaced in diameter, thereby the wedge member 8 Since the tapered surface of the outer peripheral portion 8 a is strongly pressed against the inner peripheral surface of the cylindrical support 4 of the male joint 2, the wedge member is interposed between the inner peripheral portion of the cylindrical support 4 and the female connecting member 7. 8 exerts a great wedge effect, so that the male joint 2 and the female joint 3 are connected to the male coupling member. It can be linked securely via a close fit with the female coupling member 7 and. And since the fitting state of the said male type | mold connection member 5 and the female type | mold connection member 7 can be firmly hold | maintained by the said cylindrical support body 4, the axial direction of the male type | mold joint 2 and the female type | mold joint 3, and this The connection in the orthogonal direction can be firmly performed, and thereby the coupling strength between the segments can be improved.
Since the male joint 2 and the female joint 3 are a combination of a cylindrical member and a rod-like member, the joint structure is simple and can be manufactured easily and inexpensively.

  Further, according to the segment joint structure A according to the embodiment, the female joint 3 is fixed to the bottom of the recess 1b2 provided in the joint end 1b of the other segment 1, and the tip is joined to the joint surface 1b1. An anchor bolt 6 is provided that is positioned on the inner side and protrudes into the recess 1 b 2, and the female connecting member 7 engages the female screw 7 d on the proximal end side with the male screw 6 a on the distal end portion of the anchor bolt 6. Thus, since it is configured to be detachably coupled to the anchor bolt 6, the assembly set of the female coupling member 7 and the wedge member 8 of the female coupling 3 is removed from the anchor bolt 6 in advance. The assembly set protrudes from the joint surface 1b1 of the segment 1 when the segment 1 is handled because the anchor bolt 6 may be screwed immediately before joining the segments 1 and 1 at the site. In addition, it is possible to reliably prevent the assembly set from being damaged by colliding with other members and the segment 1 from being cracked due to the collision of the assembly set. Can do.

Furthermore, according to the joint structure A of the segment according to the embodiment, the male connecting member 5 has an outer end located at a position closer to an inner side than the outer end of the cylindrical support body 4 by a predetermined dimension. Since the outer peripheral portion is provided with a tapered chamfered portion 5b whose outer end diameter is smaller than the diameter of the insertion hole 7c of the female connecting member 7, one segment 1 has On the other hand, when the other segment 1 is moved and joined, it is attached to the distal end portion of the female connection member 7 of the other segment 1 by the inner peripheral portion of the cylindrical support 4 of the male joint 2 of the one segment 1. After the outer peripheral portion of the wedge member 8 is guided and aligned, the insertion hole 7c of the female connecting member 7 is fitted into the male connecting member 5, so that the male joint 2 and the female die are joined at the start of joining. Even if the shaft centers of the joint 3 are slightly eccentric, the eccentricity is corrected. It can be smoothly connected in the female joint 3 relative to the male coupling 2 while.
However, the positions of the outer end of the cylindrical support 4 and the outer end of the male connecting member 5 do not necessarily have to be different as described above, and may be set at substantially the same position.

  In the segment joint structure A according to the embodiment, the male joint 2 is connected to the joint end 1a on the tuyere side (one end side) of the segment 1, and the joint end 1b on the wellhead side (the other end side). However, the present invention is not limited to this, and the position of the male joint 2 and the joint end 1a (1b) of the female joint 3 may be reversed from the above, and the number of installations is also limited. Three or more may be sufficient. Further, the male joint 2 and the female joint 3 are provided at the joining end portions 1a and 1b in the tunnel axial direction of the segment 1 (the joint surface side of the segment ring). It is also possible to provide a joint structure for a segment that is provided at the joint end portions 1c and 1d (on the joint surface side of the segment 1) and joins the male joint 2 and the female joint 3 to each other in the tunnel circumferential direction. it can.

  Further, in the segment joint structure A according to the embodiment, the wedge member 8 of the female joint 3 is divided into a plurality of tapered cylinders of a rigid material in the circumferential direction, and an elastic ring is provided on the outer periphery thereof. Since it is mounted and configured in a tapered cylindrical shape, when the male joint member 5 of the male joint 2 is fitted into the insertion hole 7c of the female joint member 7 and the diameter of the mounting portion is increased, the diameter of the mounting portion is increased. Following this, the wedge member 8 can be smoothly expanded in diameter and can exhibit the wedge effect accurately and firmly. However, the present invention is not limited to this, and the wedge member 8 is formed of a material that is easily elastically deformed. A simple tapered cylinder may be used. Also in this case, the tapered cylinder is forcibly enlarged and deformed in accordance with the enlarged diameter deformation of the fitting portion 7b of the female joint member 7, and the wedge effect can be exhibited. In this case, the elastic ring 9 can be omitted, and the structure becomes simple.

  In the segment joint structure A according to the embodiment, the male connecting member 5 is fixed to the bottom plate 4b of the cylindrical support 4 and fixed to the joining end 1a of the segment 1, but the present invention is not limited thereto. Instead, the bottom plate 4b may be omitted, and the male connecting member 5 may be directly embedded and fixed in the joining end portion 1a of the segment 1 via an anchor or the like. The male connecting member 5 has a solid shaft shape, but may have a hollow shaft shape or a cylindrical shaft shape as long as the material has high rigidity. Further, the female connecting member 7 is configured such that the female screw 7d formed on the female connecting member 7 is screwed into the male screw portion 6a of the anchor bolt 6 to be connected to the anchor bolt 6. It is also possible to connect the female connecting member 7 to the anchor bolt 6 by screwing a male screw portion provided on the female connecting member 7 to this.

  Furthermore, in the joint structure A of the segment according to the above embodiment, the example applied when the concrete segments 1 and 1 are joined to each other has been described. However, the present invention is not limited thereto, and the steel segments are The same action and effect can be obtained by applying to the case where the synthetic segments formed by filling concrete inside the steel segments are joined together. When applied to a joint structure in which steel segments or synthetic segments are joined together, the members constituting the cylindrical support 4 and the recess 1b2 of the male joint 2 are welded to the main girder plate, and the recess configuration An anchor bolt 6 is welded to the member, and a reinforcing member is provided between the cylindrical support and the main beam plate or between the recess constituting member and the main beam plate as necessary.

It is a longitudinal cross-sectional view which shows the state before joining of the joint structure of the segment which concerns on one embodiment of this invention. FIG. It is a longitudinal cross-sectional view which shows the joining state of the joint structure of the segment which concerns on one embodiment of this invention. It is a perspective view which shows the concrete segment to which the joint structure of the segment which concerns on one embodiment of this invention is applied.

Explanation of symbols

1 Concrete segment (segment)
1a, 1b Joining end 1a1, 1b1 Joining surface 1b2 Recess 2 Male joint 3 Female joint 4 Cylindrical support 4e Annular space 5 Male joint member 6 Anchor bolt 6a Male screw part 7 Female joint member 7b fitting part 7c Insertion hole 7d Female screw 7f Slit 8 Wedge member 8a Outer peripheral part 8d Annular groove 9 Elastic ring A Joint structure of segment

Claims (3)

The joint surfaces of a pair of adjacent segments are butted together, and the segments are joined by fitting a male joint provided at the joint end of one segment and a female joint provided at the joint end of the other segment. A joint structure of joining segments,
The male joint includes a cylindrical support and a shaft-shaped male connecting member arranged on a coaxial line with an annular space inside the cylindrical support, and the outer ends of the male joint extend outward from the joint surface. It is fixed to the joining end portion of one segment so as not to protrude, and the female joint is smaller in diameter by a predetermined dimension than the outer diameter of the male connecting member, and the male connecting member is inserted. Cylindrical female connecting member with a possible insertion hole and a plurality of slits along the axial direction on the tip side spaced apart in the circumferential direction, and a tapered cylindrical shape with a tapered outer periphery Is attached to the outer peripheral portion on the distal end side of the female connecting member, and before the male connecting member is inserted into the insertion hole of the female connecting member, the maximum outer diameter is the inner diameter of the cylindrical support of the male joint. The female connecting member has a smaller diameter by a predetermined dimension, and the male connecting member is inserted into the insertion hole. A wedge member whose maximum outer diameter is larger than the inner diameter of the cylindrical joint of the male joint when the diameter is expanded in the diameter direction, and the wedge member is wound around the outer periphery of the wedge member and moved in the diameter direction of the wedge member. A segment joint structure comprising: an elastic ring capable of expanding and contracting, wherein the female connecting member protrudes outward from a joint surface to a joint end portion of the other segment.   The female joint includes an anchor bolt that is fixed to the bottom of a recess provided at the joint end of the other segment and that protrudes into the recess with the tip positioned on the inner side of the joint surface. 2. The segment joint structure according to claim 1, wherein the base end side of the segment is detachably connected to the anchor bolt by screwing the base end side to the tip end of the anchor bolt.   The male connecting member has an outer end located at a position closer to the inner side than the outer end of the cylindrical support by a predetermined dimension, and the outer end has an outer end diameter of the female connecting member. 3. The segment joint structure according to claim 1, further comprising a tapered chamfered portion having a diameter smaller than the diameter of the insertion hole.

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