JP2006291491A - Joint structure for segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly perform additional tightening in a tightening part of a segment to perform lining work of a tunnel efficiently. <P>SOLUTION: This joint structure A for segment is constituted in such a way that a hexagon nut 8 is supported in a bolt insertion hole 6 by letting its axial line agree and preventing its rotation on an inner side of a main beam plate (a joint plate) 3a of a segment 1a, a guide pipe 13 allowing insertion of a head part 17d of a hexagon socket cap screw (a bolt) 17 is provided by fixing its terminal part on an inner side of a main beam plate 3a of a segment 1b, extending its tip part up to a nearby part on an inner side of a main beam plate (a joint plate) 3b, and letting its axial line agree with the bolt insertion hole 6 of the main beam plate 3b, and the hexagon socket cap screw 17 inserted through a bolt hole 7 provided on the main beam plate 3a of the segment 1b and inserted into each bolt insertion hole 6, 6 through the guide pipe 13 is screw-fitted into the hexagon nut 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joint structure for a segment that joins segments such as a concrete-filled steel segment used for lining a shield tunnel.

Conventionally, this type of joint structure for a segment has a long hexagon bolt head in a sheath tube that is embedded in the segment extending in the axial direction from the joint surface on one end to the joint surface on the other end. When a bolt unit formed by connecting a coupler with a fastening part formed with a screw hole in a straight line with a hexagonal bolt is arranged so that it cannot be pulled out in the axial direction, and segments adjacent in the axial direction are joined together Then, after guiding the male screw portion of the hexagon bolt, which is arranged in the other segment and protrudes from the joint surface on one end side, to the screw hole of the fastening portion in the bolt unit arranged in one segment, A device in which a coupler of a segment side bolt unit is rotated so that the male screw portion is screwed into the screw hole is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 7-317496

In the joint structure for a segment, by rotating the coupler of the bolt unit from the joint surface side of the segment, the male screw portion of the hexagon bolt and the screw hole of the coupler can be screwed together to join the segment. Unlike the joint structure for a segment in which a bolt is screwed into a nut from the inner surface side of the joint and the joint ends are fastened, a bolt box for performing the fastening operation is not required on the inner surface of the segment. There is an advantage that the segments can be efficiently manufactured without deteriorating the aesthetic appearance. However, since the hexagon bolts of the bolt unit are long enough to approximate the entire axial length of the segment, it is difficult to screw the male screw part into the screw hole of the coupler, and if the screw increases and resistance increases, When the direction is bent, the fastening portion cannot be sufficiently tightened, and the joint strength between the segments may not be appropriately obtained.
In addition, since the male screw part protrudes from the joining surface of the segment, the hexagonal bolt may damage the male screw part when transporting the segment or performing a joining operation. There is dissatisfaction that work efficiency falls and work efficiency falls.

  This invention is made in view of the said situation, Comprising: The joint structure for segments which can perform the retightening in a segment fastening part appropriately, and can perform the tunnel lining work efficiently is provided. For the purpose.

The present invention is characterized by the following points in order to solve the above problems.
That is, the joint structure for a segment according to claim 1 is a bolt insertion hole provided in each joint plate by abutting a pair of segments adjacent to each other in the axial direction of the tunnel and a joint plate provided at an end portion in the axial direction. A joint structure for a segment to be joined by screwing a nut into a bolt inserted through and fastening it,
The nut is supported on one segment on the inner side of the joining plate on one end side in a state where the axis is aligned with the bolt insertion hole and the rotation is prevented, and the head of the bolt is supported on the other segment. The guide pipe that can be inserted is fixed to the inner side of the joining plate on one end side, the distal end portion is extended in the axial direction to the adjacent portion on the inner side of the joining plate on the other end side, and the other end side A bolt hole that is provided in the bolt insertion hole of the joining plate so that its axis is aligned, and that is provided in the joining plate on one end side of the other segment and through which the head of the bolt communicating with the guide pipe can be inserted. The bolts inserted through the guide pipes and inserted into the bolt insertion holes are screwed into the nuts.

  The joint structure for a segment according to claim 2 is the joint structure for a segment according to claim 1, and is fitted to the outer periphery on the front end side of the guide pipe inside the joining plate on the other end side of the other segment. A guide ring for guiding and supporting the guide pipe so as to be relatively movable in the axial direction is fixed.

  The joint structure for a segment according to claim 3 is the joint structure for a segment according to claim 1 or 2, wherein an outer periphery of the head of the bolt is fitted into a hole of the guide pipe, and the bolt is A bolt holder that is inserted through the bolt insertion hole with its axis aligned is mounted.

  The joint structure for a segment according to claim 4 is the joint structure for a segment according to any one of claims 1 to 3, wherein the joining plate on the other end side of each segment has a periphery of the segment with respect to the guide pipe. The bolt insertion holes are provided with the positions shifted in the direction, and the segment fastening portions on both sides of each segment are arranged with the phases in the circumferential direction of the segments shifted.

  A joint structure for a segment according to claim 5 is the joint structure for a segment according to any one of claims 1 to 3, wherein the joint plate on one end side of each segment has the nut in the proximal end portion of the guide pipe. Are fixed in a detachable manner, and the segment fastening portions on both sides of each segment are arranged in a straight line with the phases in the circumferential direction of the segments matched.

The present invention has the following excellent effects.
That is, according to the joint structure for a segment according to claim 1, when joining a pair of adjacent segments in the axial direction, the bolt is inserted into the guide pipe from the bolt hole of the joining plate on one end side of the other segment. By inserting and pushing the bolt along the guide pipe using a tightening tool, the threaded portion of the bolt passes through the bolt insertion hole of each joining plate to be joined, and the other end side in one segment Can be reliably guided to the screw holes of the nuts supported by the joint plate, so that the bolts can be smoothly and quickly screwed into the nuts. Can be performed efficiently.
In addition, the bolts that fasten the joint plates of the segments need only be short lengths necessary to sandwich the pair of joint plates together with the nuts, and are long as the hexagon bolts of the conventional joint structure for segments. Therefore, even when the resistance is increased by screwing the bolt to the nut at the segment fastening portion, the bolt hardly bends in the rotational direction, and the segment fastening portion is tightened. Can be done properly.

  According to the joint structure for a segment according to claim 2, the guide pipe is supported at both ends by the joining plate and the guide ring on one end side, so that the axial direction of the guide pipe matches the axis of the bolt insertion hole Therefore, the guide movement of the bolt to the bolt insertion hole by the guide pipe can be performed smoothly and reliably. In addition, when the segment is used for the curved portion of the tunnel, the distance between the joining plates at both ends is slightly different in each segment arranged in order from the inside to the outside of the curved portion. By adjusting the amount of overlap in the axial direction of the fitting portion with the ring, the curved segment can be manufactured easily corresponding to the change in the distance between the joining plates at both ends.

  Further, according to the joint structure for a segment according to claim 3, the bolt is securely aligned with the axis of the guide pipe by the bolt holder mounted on the outer periphery of the head of the bolt. Since the inside of the bolt is guided and moved, the screw portion of the bolt can be more reliably guided to the screw hole of the nut through the bolt insertion hole.

  Further, according to the joint structure for a segment according to claim 4, when a plurality of segments are sequentially joined in the axial direction, each time a pair of segments are joined, the nut is joined to the joining plate of the fastening portion of the next segment. Therefore, it is possible to smoothly and quickly perform the joining operation of the segments.

  Further, according to the joint structure for a segment according to claim 5, since the bolts and nuts of the segment fastening portions in the plurality of segments can be screwed and tightened at the same position in the circumferential direction of the segment, the work is always performed in the same posture. Since the tightening force at the fastening portion is aligned on a straight line in the axial direction of the segments, it is possible to prevent an undesirable stress from acting on the joining plate of each segment as much as possible. .

Hereinafter, a segment joint structure according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 3, reference numeral 1 denotes an arc-shaped concrete filling type steel segment (hereinafter simply referred to as “segment”) joined by a segment joint structure A according to an embodiment of the present invention. This segment 1 (1a, 1b) includes an arcuate skin plate 2 and a main girder plate fixed at both ends in the axial direction (tunnel axial direction) of the skin plate 2 and orthogonal to the skin plate 2 (Joining plates) 3a, 3b, joint plates 4, 4 fixed to both ends of the skin plate 2 in the arc direction (circumferential direction) and provided toward the center of the arc, and the inside of the skin plate 2 The main girder plates 3a and 3b and the synthetic resin panel 5 joined to the joint plates 4 and 4 are provided.

  The one segment 1a has a bolt insertion hole 6 through which a shaft portion of a bolt for fastening the segment can be inserted and a bolt hole 7 through which the head of the bolt can be inserted into the main girder plate 3a at one end thereof. The position is shifted in the arc direction of 1a. Further, the bolt insertion hole 6 is provided in the main beam plate 3b on the other end side so as to coincide with the axis of the bolt hole 7 in the axial direction of the segment 1a. A hexagon nut (nut) 8 whose axis is aligned with the bolt insertion hole 6 is rotated around the axis by the nut holder 9 on the surface (inner side) opposite to the joining surface of the main girder plate 3a on the one end side. Stopped and supported. The nut holder 9 has a hexagonal hole 9a into which the hexagonal nut 8 can be fitted exactly at one end, a circular hole 9b smaller in diameter than the hexagonal hole 9a toward the other end, and a screw hole smaller in diameter than the circular hole 9b. A holder main body 9d in which 9c is sequentially provided in a staircase shape, a flange 9e integrally provided on the outer periphery on one end side of the holder main body 9d, and a rib 9f integrally provided on the outer periphery of the holder main body 9d in the diameter direction; It has.

The nut holder 9 has the front surface of the flange 9e abutted on the inner side of the main girder plate 3a, and the outer peripheral portion is fixed to the main girder plate 3a by welding, an adhesive or the like, and is fitted into the hexagonal hole 9a. The rotation of the hexagonal nut 8 is prevented from rotating around the axis, and a slight movement in the axial direction is allowed.
A guide pipe 13 having a hole 13a having the same diameter as the bolt hole 7 and capable of being inserted through the head of a segment fastening bolt is provided on the inner side of the main girder plate 3a. The base end portion (the end portion on the main girder plate 3a side) is fixed via the attachment ring 14 in a state where it is aligned with the axis of the bolt insertion hole 6 and the bolt hole 7 of the plate 3b. The mounting ring 14 is formed as an integrated body provided with a flange 14b at one end of the cylindrical portion 14a. The base end of the guide pipe 13 is fitted and fixed to the cylindrical portion 14a, and the flange 14b is fixed to the main girder plate 3a. It is fixed by welding or adhesive.

  The guide pipe 13 is extended in the axial direction until the tip portion reaches a proximity portion where a slight gap E is opened between the guide pipe 13 and the inside of the main girder plate 3b on the other end side. And the guide ring 16 formed substantially the same as the said attachment ring 14 is being fixed to the said main girder board 3b by welding, an adhesive agent, etc. via the flange 16b. Further, the distal end side of the guide pipe 13 is fitted to a cylindrical portion 16 a of the guide ring 16 over a predetermined length, and the guide pipe 13 is movable relative to the guide ring 16 in the axial direction. An O-ring 15 is mounted on the inner peripheral portion of the guide ring 16 on the distal end side of the cylindrical portion 16a to make the fitting portion between the guide pipe 13 and the cylindrical portion 16a liquid-tight.

  The other segment 1b joined adjacent to the one segment 1a includes the bolt hole 7 of the main girder plate 3a on one end side and the bolt insertion hole 6 of the guide pipe 13 and the main girder plate 3b on the other end side. A guide ring 16 is provided in such a manner that its axis coincides with the axis of the bolt insertion hole 6 in which the hexagon nut 8 of one segment 1a is arranged, and the bolt insertion hole 6 of the main girder plate 3a on one end side. The hexagonal nut 8 is connected to the bolt holes 7 and the guide pipe 13 of the main girder plate 3a on one end side of one segment 1a, and the bolt insertion holes 6 and the guide ring 16 of the main girder plate 3b on the other end side. It is provided so as to coincide on the axis. That is, the configuration of the other segment 1b is such that the bolt insertion hole 6, the bolt hole 7, the hexagon nut 8, the bolt holder 9, the guide pipe 13, and the guide ring 16 with respect to the main girder plates 3a and 3b are arranged in one segment. It is set as the structure reversed in the circular arc direction of segment 1a, 1b with respect to what in 1a. However, since the configuration of each part and each member is the same, the same components are denoted by the same reference numerals, and description thereof will be omitted.

  At the joint surfaces of the main beam plates 3a and 3b in the one and other segments 1a and 1b, the bolt insertion holes 6 of the main beam plate 3a of one segment 1a and the bolt insertion holes 6 of the main beam plate 3b of the other segment 1b. And the hexagon socket head cap screw (bolt) 17 positioned in the hole 13a on the tip end side of the guide pipe 13 of the other segment 1b is connected to an elastic washer w on the shaft portion 17a. The shaft portion 17a is inserted through the bolt insertion holes 6 and 6, and the screw portion 17b on the tip side of the shaft portion 17a is supported by the nut holder 9 on the main girder plate 3a. The segments 1a and 1b are joined together by tightening the main girder plates 3a and 3b with the hexagon socket head bolt 17 and the hexagon nut 8. A bolt head 18 that slides into the hole 13 a of the guide pipe 13 is attached to the cylindrical head portion 17 d of the hexagon socket head bolt 17. The bolt holder 18 is formed of a thin cylindrical member that is at least twice as long as the axial length of the head portion 17d of the hexagon socket head cap bolt 17, and the free end side is slightly slightly outward from the rear end portion. A plurality of protrusions 18a urged in an open manner are provided at intervals in the circumferential direction (see FIGS. 7A and 7B). The bolt holder 18 is brought into close contact with the hole 13a of the guide pipe 13 by the urging force of the projection 18a, and the hexagon socket head bolt 17 (shaft portion 17a) is kept horizontal with its axis aligned with the axis of the guide pipe 13. Thus, the guide pipe 13 is slid in the axial direction and the circumferential direction.

The mounting ring 14 does not form the cylindrical portion 14a and the flange portion 14b as a single piece, but as a separate piece as shown in FIG. Also good. Instead of fixing the guide pipe 13 to the main girder plates 3a and 3a on one end side of the segments 1a and 1b via the mounting ring 14, the base end portion of the guide pipe 13 is connected to the main girder as shown in FIG. You may make it insert in the bolt holes 7 and 7 of board 3a, 3a, and it may be made to adhere to those main beam boards 3a and 3a directly. In this way, the number of parts can be reduced.
The space surrounded by the skin plate 2, main girder plate 3, joint plate 4, and synthetic resin panel 5 is filled with concrete and hardened.

Next, a method of joining one segment 1a and the other segment 1b, which are joined together by the joint structure A of segments according to the embodiment having the above-described configuration, will be described with reference to FIGS.
First, the other segment 1b is approached from the tuyere side with respect to the one segment 1a already covered on the tunnel entrance side, and the bolt insertion hole 6 of the main girder plate 3a on one end side of the one segment 1a After aligning with the bolt insertion hole 6 of the main beam plate 3b on the other end side of the other segment 1b, the joint surfaces of the two main beam plates 3a and 3b are brought into contact with each other.
After that, the hexagon socket head bolt 17 with the shaft 17a elastic washer w and the bolt holder 18 attached to the head 17d is inserted into the hole 13a of the guide pipe 13 from the bolt hole 7 of the other segment 1b and tightened. The inside of the guide pipe 13 is pushed toward the bolt insertion holes 6 and 6 using a tool 19 (see FIG. 6A). When the extension shaft portion 17 c at the tip of the hexagon socket head bolt 17 passes through the bolt insertion holes 6, 6 and the hexagon nut 8, the screw portion 17 b of the hexagon socket head bolt 17 engages with the screw hole 8 a of the hexagon nut 8. To do. Here, when the hexagonal shaft portion 19a at the tip of the tightening tool 19 is fitted in the hexagonal hole 17e of the head portion 17d of the hexagonal socket bolt 17, the handle 19a is rotated while being pushed toward the hexagonal nut 8 side. Since the screw portion 17b of the hexagon socket head cap screw 17 is screwed into the screw hole 8a of the hexagon nut 8, the front end surface 17f of the head portion 17d of the hexagon socket head cap screw 17 is connected to the main girder plate 3b via the elastic washer w. After abutting on the inner side surface, retightening is performed (see FIG. 6B). Thereafter, the fastening tool 19 is extracted from the guide pipe 13 and the joining operation of the segments is completed.

After the joining of the segments 1a and 1b, in the segment fastening portion X formed by the hexagon nut 8 and the hexagon socket head bolt 17, the elastic washer w is the head 17d of the hexagon socket head bolt 17 and the main mold plate on one end side. 3a and 3b, even if vibration occurs in the segments 1a and 1b, the screwed portion between the hexagon socket head bolt 17 and the hexagon nut 8 is not loosened, and the tunnel covering body is bent. However, it is possible to prevent the undesired stress from acting on the segment fastening portion X by flexibly corresponding to the bending. The elastic washer w is not essential but is preferably provided.
In addition, the outer periphery of the shaft portion 19b of the tightening tool 19 is slid into the hole portion 13a of the guide pipe 13 at two positions spaced apart in the axial direction so that the shaft portion 19b is aligned with the axis of the guide ring 13. A centering member 19c is attached.

In the joining operation of the segments, when the hexagon socket head bolt 17 is pushed by the tightening tool 19 along the hole 13a of the guide pipe 13, as shown in FIG. The bolt holder 18 mounted on the outer periphery of the head portion 17d guides the guide pipe 13 so that the hexagon socket head bolt 17 is in a state in which its axis is securely aligned with the axis of the guide pipe 13 and kept horizontal. Since it is moved, the screw portion 17b of the hexagon socket head cap screw 17 can be reliably guided to the screw hole 8a of the hexagon nut 8 through the bolt insertion holes 6 and 6. The bolt holder 18 has a length in the axial direction as long as possible, and the tip end side projects forward from the tip end surface 17f of the head portion 17d of the hexagon socket head bolt 17 and is attached to the position of the center of gravity of the hexagon socket head bolt 17. When the tip edge comes into contact with the inside of the main beam plate 3b, it stops at that position, and only the head portion 17d of the hexagon socket head bolt 17 slides forward with respect to the bolt holder 18. Good.
If the bolt holder 18 is not attached to the head portion 17d of the hexagon socket head cap bolt 17, as shown in FIG. 7C, the hexagon socket head cap screw 17 has a center of gravity close to its tip side. Since the tip end side is lowered and the screw portion 17b is in contact with the bottom portion of the inner hole 3a of the guide pipe 13 and moves to the bolt insertion hole 6 side, when the extension portion 17c at the tip reaches the position of the bolt insertion hole 6, The extension portion 17c comes into contact with the corner of the bolt insertion hole 6 so that the shaft portion 17a cannot be inserted into the bolt insertion hole 6, and the hexagon socket head bolt 17 is smoothly screwed into the hexagon nut 8. May not be possible.

  As described above, in the segment joint structure A according to the embodiment, the pair of segments 1a and 1b adjacent to each other in the axial direction of the tunnel are provided with the main beam plates 3a and 3b provided at the end portions in the axial direction. A joint structure for a segment which is joined by screwing and fastening a hexagon nut 8 to a hexagon socket head bolt 17 inserted into a bolt insertion hole 6, 6 provided in each main girder plate 3a, 3b. The hexagonal nut 8 is supported on the inner side of the main girder plate 3a on one end side in a state where the axis is aligned with the bolt insertion hole 6 and rotation is prevented, and the other segment 1b is supported on the other segment 1b. The guide pipe 13 through which the head 17d of the hexagon socket head cap bolt 17 can be inserted has its base end fixed to the inside of the main girder plate 3a on one end side, and the tip end of the main girder plate 3b on the other end side. In the axial direction up to the inner proximity The length of the main girder plate 3b on the other end side is provided with the axial line aligned with the bolt insertion hole 6 and provided on the main girder plate 3a on one end side of the other segment 1b. The hexagon socket head bolt 17 inserted through the guide pipe 13 and into the bolt insertion holes 6 and 6 is inserted from the bolt hole 7 through which the head portion 17d of the hexagon socket head bolt 17 communicating with the bolt is inserted. The hexagon nut 8 is screwed together.

Therefore, according to the joint structure A of the segments according to the embodiment, when a pair of adjacent segments 1a, 1b are butted in the axial direction, the bolt holes of the main girder plate 3a on one end side of the other segment 1b 7 is inserted into the guide pipe 13, and the hexagon socket head bolt 17 is pushed along the guide pipe 13 by using a tightening tool 19, whereby the threaded portion 17 b of the hexagon socket head bolt 17 is provided. Through the bolt insertion holes 6 and 6 of the main girder plates 1a and 1b to be joined to the screw holes 8a of the hexagon nuts 8 supported by the main girder plate 3a on one end side in one segment 1a. Since it can be guided, the hexagon socket head bolt 17 can be smoothly and quickly screwed into the hexagon nut 8, and the segments 1a and 1b can be joined to each other. , I.e., capable of lining work of the tunnel efficiently.
Further, the hexagon socket head bolt 17 for fastening the main girder plates 3a, 3b of the segments 1a, 1b is sufficient with a short length necessary to sandwich the pair of main girder plates 3a, 3b together with the hexagon nut 8. Since there is no need to use a long hex bolt as in the conventional joint structure for a segment, when the hexagon socket head bolt 17 is screwed into the hex nut 8 at the segment fastening portion X, the resistance increases. Even in such a case, the hexagon socket head bolt 17 hardly undergoes bending in the rotational direction, and the segment fastening portion X can be properly tightened.

Moreover, according to the joint structure A for a segment according to the embodiment, the guide pipe 13 is fitted to the outer periphery on the front end side of the guide pipe 13 inside the main beam plate 3b on the other end side of the other segment 1b. Since the guide ring 16 that guides and supports the shaft 13 so as to be relatively movable in the axial direction is fixed, the guide pipe 13 is supported at both ends by the main girder plate 3a and the guide ring 13 on one end side, Since the state in which the axial direction of the guide pipe 13 matches the axial line of the bolt insertion holes 6 and 6 can be reliably maintained, the guide pipe 13 smoothly guides the hexagon socket bolt 17 to the bolt insertion hole 6. It can be done reliably. Further, when the segments 1a and 1b are used for the curved portion of the tunnel, the distance between the main girder plates 3a and 3b at both ends is slightly different in each segment arranged in order from the inside to the outside of the curved portion. By adjusting the amount of overlap in the axial direction at the fitting portion between the distal end portion of 13 and the guide ring 16, the length of the guide pipe 13 can be changed to the change in the distance between the main girder plates 3a and 3b at both ends. Even if it does not change, it can be made to respond easily and the segment for curve parts can be manufactured.
Further, the outer periphery of the head 17 d of the hexagon socket head bolt 17 is fitted into the hole 13 a of the guide pipe 13, and the hexagon socket head bolt 17 is inserted into the bolt insertion hole 6 with its axis line aligned. Since the bolt holder 18 is mounted, the bolt holder 18 guides the inside of the guide pipe 13 with the hexagon socket head bolt 17 having its axis line aligned with the axis line of the guide pipe 13 with certainty. Since it is moved, the threaded portion 17b of the hexagon socket head bolt 17 can be guided to the screw hole 8a of the hexagon nut 8 through the bolt insertion hole 6 more reliably.

  Next, FIG. 8 shows a joint structure for a segment according to another embodiment. In the segment joint structure B according to this embodiment, the segment joint structure A according to the above embodiment has the segment fastening portion X formed by the hexagon nut 8 and the hexagon socket head bolt 17 on both sides of each segment 1a, 1b. The segments 1a and 1b are arranged so that the positions (phases) in the arc direction (circumferential direction) are shifted, whereas the segment fastening portions Y on both sides of the segments 1a and 1b are connected to the segments 1a and 1b. Is different from the segment joint structure A in that the phases in the arc direction (circumferential direction) are aligned and aligned along the axial direction of the tunnel.

  That is, a pair of adjacent segments 1a and 1b joined together have the same configuration, and a cylindrical portion 14a in which a mounting ring 14 for fixing the guide pipe 13 to the main girder plate 3a on one end side is formed separately. And the flange 14b are joined by welding or the like, and a female screw 7a is provided inside the mounting ring 14. A nut 8A provided with a hexagonal hole (bolt insertion hole) 6A and a screw hole 8a communicating therewith is screwed into the female screw 7a of the mounting ring 14 through the bolt hole 7A of the main girder plate 3a on one end side. Thus, the nut 8A is detachably fixed to the base end portion of the guide pipe 13. Since other configurations are the same as the segment joint structure A according to the above-described embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

In the joint structure B for a segment according to this embodiment, when joining the segments, the nut 8A is screwed onto the female thread 7a of the mounting ring 14 fixed to the main girder plate 3a on one end side of the other segment 1b. In the same manner as in the case of the segment joint structure A according to the above-described embodiment, the hexagon socket head bolt 17 and the elastic washer w are inserted into the guide pipe 13 from the bolt hole 7A through the mounting ring 14. , Moved along the guide pipe 13, screwed into the nut 8A supported by the main girder plate 3a of one segment 1a, and then fixed to the main girder plate 3a on one end side of the other segment 1b The nut 8A is screwed and supported on the female screw 7a of the ring 14, and the segments are sequentially joined.
The nut 8A is screwed into the female screw 7a by inserting a tool into the hexagonal hole 6A provided at the outer end of the nut 8A and turning it.

  In the segment joint structure B according to this embodiment, in addition to the same effects as the joint structure A according to the above embodiment, the hexagon socket head cap bolt 17 of the segment fastening portion Y in the plurality of segments 1a, 1b. And the hexagon nut 8A can be screwed and tightened at the same position in the circumferential direction of the segments 1a and 1b, so that the work can always be easily performed in the same posture, and the tightening force at the segment fastening portion Y is the segment 1a. , 1b are aligned on a straight line in the axial direction, it is possible to prevent an unfavorable stress from acting on the main beam plates 3a, 3b of each segment as much as possible. Moreover, each segment 1a, 1b can be made into the same structure, and manufacture of a segment is easy.

  The nut 8A is screwed into a female screw 7a provided on the mounting ring 14 and fixed to the guide pipe 13 via the outer mounting ring 14 in a detachable manner. When using 13, as shown in FIG. 9, a female screw 7a may be provided at the end of the guide pipe 13 itself, and a nut 8A may be screwed into the female screw 7a. Further, as shown in FIG. 10, the base end portion of the thick guide pipe 13 is inserted into the bolt hole 7A of the main girder plate 3a on one end side, and the guide pipe 13 is directly connected to the main pipe plate 13 without going through the mounting ring 14. The nut 8A may be screwed into the female screw 7a provided on the guide pipe 13 by being fixed to the beam plate 3a by welding or the like.

  In addition, like the joint structure A for a segment according to the above-described embodiment, when the segment fastening portion X has a configuration in which the phase in the arc direction (circumferential direction) of each segment 1a, 1b is shifted, the implementation When the plurality of segments are sequentially joined in the axial direction as in the segment joint structure B according to the embodiment, the hexagon nut 8A is attached to the next segment fastening portion Y each time the joining of the pair of segments 1a and 1b is completed. The main girder plate 3a is not required to be attached, and the joining operation of the segments can be performed smoothly and quickly.

  In the segment joint structures A and B according to the above embodiment, the bolt holder 18 is mounted on the head portion 17d of the hexagon socket head cap bolt 17 so that the hexagon socket head cap bolt 17 has its axis in the guide pipe 13. Can be inserted into the bolt insertion holes 6 and 6A while maintaining a horizontal position, but instead of using the bolt holder 18, as shown by a chain line in FIG. 7 (a), compressible elasticity made of styrene foam, urethane rubber or the like. A cylindrical spacer S formed of a material and having an outer diameter that slides into the hole 13 a of the guide pipe 13 may be attached to the shaft 17 a of the hexagon socket head bolt 17. In this case, when the hexagon socket head cap screw 17 is screwed onto the hexagon nut 8 and nut 8A and tightened, the spacer S is compressed to reduce the thickness and the hexagon nut 8 and 8A are attached to the hexagon socket. Since the screw portion 17b of the bolt 17 is deeply screwed and a strong tightening force is obtained through the compression force, the fastening portion of the hexagon nut 8, 8A and the hexagon socket head bolt 17 is provided for the spacer S. There is no risk of insufficient tightening force. When the spacer S is compressed flat, it performs the same function as the elastic washer w. Therefore, when the spacer S is used, the elastic washer w can be omitted.

  In the segment joint structures A and B according to the above embodiment, the hexagon socket head cap screw 17 is used as a bolt to be screwed into the hexagon nut 8 and the nut 8A. A type of bolt can be used. Moreover, although the example in which the joint structures A and B for the segments according to the above embodiment are applied to the case where the concrete-filled steel segments are joined is shown, the present invention is not limited to this, and the concrete segments are joined to the joining plate. The present invention can also be applied to the case of joining via a wire.

It is a longitudinal cross-sectional view which shows the joint structure for segments of one embodiment of this invention. FIG. FIG. 2 is a view as viewed from the arrow of FIG. 1. It is a longitudinal cross-sectional view which shows an example of the fixing structure to the main girder board of the guide pipe in the joint structure for segments of one embodiment of this invention. It is a longitudinal cross-sectional view which similarly shows the other example of the fixing structure to the main girder of a guide pipe. It is explanatory drawing which shows the fastening procedure with respect to the nut of the volt | bolt in the joint structure for segments similarly. It is explanatory drawing which shows the insertion process to the volt | bolt insertion hole of the volt | bolt in the joint structure for segments similarly. It is a longitudinal cross-sectional view which shows the joint structure for segments of other embodiment of this invention. It is a longitudinal cross-sectional view which shows an example of the attachment structure of the nut to the guide pipe in the joint structure for segments similarly. It is a longitudinal cross-sectional view which shows the other example of the attachment structure of the nut to the guide pipe in the joint structure for segments similarly.

Explanation of symbols

1, 1a, 1b Concrete filled steel segment (segment)
3a, 3b Main girder plate 6 Bolt insertion hole 6A Hexagon socket (bolt insertion hole)
7, 7A Bolt hole 7a Female thread 8 Hexagon nut (nut)
8A Nut 8a Screw hole 9 Nut holder 13 Guide pipe 14 Mounting ring 16 Guide ring 17 Hexagon socket head cap screw (bolt)
17a Shaft portion 17b Screw portion 17d Head portion 18 Bolt holder 19 Tightening tool A, B Segment joint structure X, Y Segment fastening portion

Claims (5)

A pair of segments adjacent to each other in the axial direction of the tunnel are fastened by screwing a nut to a bolt inserted into a bolt insertion hole provided in each joining plate by abutting a joining plate provided at an end portion in the axial direction. A joint structure for segments to be joined by
The nut is supported on one segment on the inner side of the joining plate on one end side in a state where the axis is aligned with the bolt insertion hole and the rotation is prevented, and the head of the bolt is supported on the other segment. The guide pipe that can be inserted is fixed to the inner side of the joining plate on one end side, the distal end portion is extended in the axial direction to the adjacent portion on the inner side of the joining plate on the other end side, and the other end side A bolt hole that is provided in the bolt insertion hole of the joining plate so that its axis is aligned, and that is provided in the joining plate on one end side of the other segment and through which the head of the bolt communicating with the guide pipe can be inserted. The joint structure for a segment, wherein the bolts inserted through the guide pipes and inserted into the bolt insertion holes are screwed into the nuts.   A guide ring that is fitted to the outer periphery of the front end of the guide pipe and guides and supports the guide pipe so as to be relatively movable in the axial direction is fixed inside the joining plate on the other end side of the other segment. The segment joint structure according to claim 1, wherein the segment joint structure is a segment.   A bolt holder fitted to a hole portion of the guide pipe and fitted through the bolt insertion hole with an axis line aligned with the bolt insertion hole is mounted on the outer periphery of the bolt head. The joint structure for a segment according to 1 or 2.   The joint plate on the other end side of each segment is provided with the bolt insertion holes shifted in the circumferential direction of the segment with respect to the guide pipe, and the segment fastening portions on both sides of each segment are arranged around the segment. The joint structure for a segment according to any one of claims 1 to 3, wherein the segments are arranged with a phase shifted in a direction. The nut is detachably fixed in the base end portion of the guide pipe to the joining plate on one end side of each segment, and the segment fastening portions on both sides of each segment are aligned with each other in phase in the circumferential direction of the segment. The joint structure for a segment according to any one of claims 1 to 3, wherein the segment joint structure is disposed in a vertical direction.

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