JP4310520B2 - Segment joint structure - Google Patents

Description

  The present invention relates to a joint structure for a segment.

Conventionally, in assembling segments in shield tunnel construction, a communication hole is provided in advance in the segment, and when the segments are brought into contact with each other, a bolt is inserted into the communication hole and tightened with a nut. However, the conventional joint structure has a problem that the work efficiency is low and the work period is prolonged because the positioning of the communication hole and the tightening operation of the bolt and nut are troublesome.
Therefore, in Patent Document 1, a segment having a male joint made of a bolt head on the joint surface and a segment having a female joint made of a locking plate having a notch on the joint surface are used, and the joint surfaces of the segments are slid. Thus, a joint structure of segments is disclosed in which segments are joined by fitting the bolt heads into the notches.
JP 10-46988 A (page 2-3, FIG. 5)

However, in the segment joint structure described in Patent Document 1, it is difficult to set the thickness of the locking plate. If the locking plate is too thin, the joint is loosened. If the locking plate is too thick, the bolt breaks. There is a fear. Further, since there is no play between the bolt and the locking plate, there is a problem that high accuracy is required when the anchor portion of the joint is embedded in the segment.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a segment joint structure in which the joining operation of the segments is extremely easy and the reliability of the joint portion is excellent.

In order to achieve the above object, in the joint structure of a segment according to the present invention, after bringing the joint surfaces of one segment having a male joint into the joint surface and the other segment having the female joint into the joint surface, abut each other. A segment joint structure in which the segments are joined by sliding and fitting the male joint and the female joint, and the male joint uniformly cuts the peripheral wall of the cylindrical member in the central axis direction. A pivot protrusion formed with a claw and a fitting to the outer peripheral surface of the pivot protrusion, and the center axis of the pivot protrusion is opened on the joint surface side so as to be substantially located on the joint surface. A concave portion and a semi-cylindrical shaft portion fitted to the inner peripheral surface of the rotating projection, and the female joint is fitted to a claw portion formed on the rotating projection, on the joint surface side It consists of the groove part which opens.
By bringing the joint surfaces of the segment having the male joint on the joint surface and the segment having the female joint on the joint surface into contact with each other, the pivot protrusion protruding from the joint surface is rotated and formed on the pivot protrusion. The nail part enters the groove part. Then, the segments are fastened together by sliding the segments in this state.
The force acting on the male joint is transmitted to the segment through a shaft portion that pivotally supports the rotating protrusion. Note that both end portions of the shaft portion are fixed to male joints.
In the present invention, the rotating protrusion of the male joint rotates, and the claws formed on the rotating protrusion are fitted into the groove of the female joint so that the segments are fastened together. Assembly time is also greatly reduced. In addition, since almost the entire length of the segment joint surface can be used as a joint, it is structurally advantageous compared to a conventional joint such as a bolt box.

In the segment joint structure according to the present invention, the male joint and the female joint can be slid by sliding the joint surfaces of one segment having a male joint on the joint surface and the other segment having a female joint on the joint surface. A joint structure of segments in which segments are joined together by fitting a joint, wherein the male joint is a rotating projection having a claw portion formed by uniformly cutting a cross section of a cylindrical member in the central axis direction And a recess that is fitted to the outer peripheral surface of the rotation protrusion and that opens to the joint surface side so that the central axis of the rotation protrusion is located inward of the joint surface, and the female joint is And a groove portion that fits into a claw portion formed on the rotation protrusion and opens to the joint surface side.
In the present invention, since the concave portion to be fitted to the outer peripheral surface of the rotating projection is formed so that the central axis of the rotating projection is located inward (in the segment) from the joint surface, the male joint and the female joint are Even if the pulling force is applied, the rotating protrusion does not come out of the recess.
Also in the present invention, the rotating projection of the male joint rotates, the claw portion of the rotating projection fits into the groove portion of the female joint, and the segments are fastened together. Play.

Moreover, in the joint structure of the segment which concerns on this invention, the latching protrusion is formed in one edge part of the said groove part, and the latching groove | channel which fits into the said latching protrusion in one edge part of the said rotation protrusion May be formed on the outer peripheral surface.
In the present invention, the locking protrusion is formed at one end of the groove, and the locking groove is formed on the outer peripheral surface of the one end of the rotating protrusion, so that the locking protrusion is formed when the segments are slid. Can be fitted into the locking groove, and the rotation protrusion can be rotated in the reverse direction to prevent the claw portion from coming out of the groove portion.

Further, in the joint structure of a segment according to the present invention, a locking projection is formed to protrude from the joining surface at one end of the groove, and the locking projection is formed at one end of the rotating projection. A locking recess may be formed that fits into the.
In the present invention, the locking projection is formed so as to protrude from one end of the groove, and the locking projection is formed on one end surface of the rotating projection, so that the locking projection is formed when the segments are slid. It is possible to prevent the claw portion from slipping out of the groove portion by fitting the portion into the locking recess and rotating the rotation protrusion in the reverse direction.

  According to the present invention, the rotating projection of the male joint is rotated by bringing the joint surfaces of the segment having the male joint on the joint surface and the segment having the female joint on the joint surface into contact with each other. Since the claws formed on the protrusions are fitted into the grooves of the female joint and the segments are fastened together, the joining operation of the segments is extremely easy. Moreover, since the structure of the joint is simple, the reliability of the joint is excellent.

Embodiments of a joint structure for a segment according to the present invention will be described below with reference to the drawings.
[First embodiment]
1A and 1B show a first embodiment of a joint structure of a segment according to the present invention, wherein FIG. 1A is a perspective view of a male segment having a male joint, and FIG. 1B is a perspective view of a female segment having a female joint. It is. FIG. 2 is an exploded perspective view of the male joint and the female joint.
Each of the segments 10 and 20 is a concrete segment having an arc plate shape, and includes a male joint surface 10a at one circumferential end and a female joint surface 20a at the other circumferential end. And the ring which comprises a cylindrical wall body is constructed | assembled by joining the male type | mold joint surface 10a and the female type | mold joint surface 20a of these segments 10 and 20 adjacently arranged by the circumferential direction of the tunnel.

The male joint surface 10a is formed with a box-shaped concave portion 10b over the entire length of the joint surface, and the male joint 1 is embedded in the concave portion 10b with its surface exposed.
The male joint 1 is fitted to a rotating protrusion 3 having a substantially C-shaped cross section in which a claw portion 3a is formed by uniformly cutting a peripheral wall of a cylindrical member in the central axis direction, and an outer peripheral surface of the rotating protrusion 3. And a box-shaped male housing 4 having a recess 4a that is open on the side of the joint surface 10a so that the central axis of the pivot projection 3 is substantially located on the joint surface 10a. It is composed of a semi-cylindrical shaft portion 5 fitted to the peripheral surface.
Band plate-like support members 4b are respectively formed on both end surfaces of the recess 4a, and the ends of the shaft portion 5 are joined.
Further, on the outer peripheral surface on one end portion side of the rotating projection 3 (specifically, on the outer peripheral side corner portion of one end surface), a locking groove 3b that fits into a locking projection 6b to be described later is provided. Are formed in the direction of the central axis.

On the other hand, a box-shaped recess 20b is formed on the female joint surface 20a over the entire length of the joint surface, and the female joint 2 is exposed and embedded in the recess 20b.
The female joint 2 is composed of a box-shaped female housing 6 that is fitted to a claw portion 3a formed on the rotating protrusion 3 and has a groove portion 6a that is open on the side of the joint surface 20a. A locking projection 6b is formed on the end portion (specifically, one end surface).

3 and 4 are cross-sectional views showing a method for joining segments.
First, the male joint surface 10a and the female joint surface 20a are opposed to each other, and the female housing 6 is brought into contact with the lower edge portion 3c of the rotating protrusion 3 (see FIGS. 3A and 4A). Further, when the male joint surface 10a and the female joint surface 20a are brought close to each other, the lower edge 3c of the rotation protrusion 3 is pressed against the female housing 6, and the rotation protrusion 3 is in the recess 4a with the shaft portion 5 as the rotation axis. The claw portion 3a of the rotation protrusion 3 enters the groove portion 6a formed in the female housing 6 (see FIG. 3B). And the claw part 3a fits into the groove part 6a by closely contacting the male joint surface 10a and the female joint surface 20a (see FIG. 3C).
Next, the segments 10 and 20 are slid in the direction of the central axis of the rotation protrusion 3. As a result, the locking projection 6b formed at one end of the groove 6a and the locking groove 3b formed at the outer peripheral surface on the one end side of the rotating projection 3 are fitted, and the male joint 1 and the female Even if a force for separating the joint 2 is applied, the rotating protrusion 3 does not come out of the groove 6a (see FIG. 4B). In this case, the segment 20 is slid from the front to the back in the direction orthogonal to the paper surface. .)

In the segment joint structure according to the present embodiment, the male joint 1 is rotated by bringing the joint surfaces of the segment 10 having the male joint 1 on the joint surface and the segment 20 having the female joint 2 on the joint surface into contact with each other. Since the projection 3 rotates and the claw portion 3a formed on the rotation projection 3 fits into the groove 6a of the female joint 2 and the segments 10 and 20 are fastened together, the fastening is completed simultaneously with the mechanical positioning. As a result, the assembly time of the segments is greatly reduced.
Moreover, in the joint structure of the segment by this embodiment, since the full length of the segment joint surfaces 10a and 20a can be used as a joint, large joint strength can be ensured and it is structurally compared with conventional joints such as a bolt box. It is advantageous.
Furthermore, in the joint structure of the segment according to the present embodiment, a joint device such as a bolt box is not required on the surfaces of the segments 10 and 20, so that the inner peripheral surfaces of the segments 10 and 20 are smooth and the secondary lining is omitted. This saves you the trouble of filling the bolt box.

[Second Embodiment]
5A and 5B show a second embodiment of the joint structure of segments according to the present invention, in which FIG. 5A is an exploded perspective view of a male joint, and FIG. 5B is an exploded perspective view of a female joint.
The male joint 11 is fitted to the rotating protrusion 13 in which the cross-section of the cylindrical member is cut out in a substantially fan shape uniformly in the central axis direction to form the claw portion 13a, and the outer peripheral surface of the rotating protrusion 3. It is composed of a box-shaped male housing 14 formed on the side surface with a recess 14a that opens on the side of the joint surface 10a so that the central axis of the rotating projection 13 is located inward (inside the segment 10a) from the joint surface 10a. .
On one end surface of the rotation protrusion 13, a locking recess 13 b that fits into a locking protrusion 16 b described later is formed.

  On the other hand, the female joint 12 is composed of a box-shaped female housing 16 that fits into a claw portion 13a formed on the rotation protrusion 13 and has a groove portion 16a that opens on the side of the joint surface 20a. One end portion (specifically, one end surface) is formed with a locking convex portion 16b having a fan shape in a sectional view so as to protrude from the one side surface of the female housing 16.

6 and 7 are cross-sectional views showing a method of joining segments.
First, the male joint surface 10a and the female joint surface 20a are opposed to each other, and the female housing 16 is brought into contact with the lower edge portion 13c of the rotating protrusion 13 (see FIG. 6A). Furthermore, when the male joint surface 10a and the female joint surface 20a are brought close to each other, the lower edge portion 13c of the rotation protrusion 13 is pressed against the female housing 16, and the rotation protrusion 13 rotates in the recess 14a to rotate. The claw portion 13a of the protrusion 13 enters the groove portion 16a formed in the female housing 16 (see FIG. 6B). And the claw part 13a fits into the groove part 16a by closely contacting the male joint surface 10a and the female joint surface 20a (see FIG. 6C).
Next, the segments 10 and 20 are slid in the direction of the central axis of the rotation protrusion 13. As a result, the locking protrusion 16b formed at one end of the groove 16a and the locking recess 13b formed at one end face of the rotating protrusion 13 are fitted, and the force that separates the male joint 11 and the female joint 12 from each other. The rotating protrusion 13 does not come out of the groove 16a even if (see FIG. 7: in this case, the segment 20 is slid from the front to the back in the direction orthogonal to the paper surface).

  In the joint structure of the segment according to the present embodiment, the concave portion 14a that fits to the outer peripheral surface of the rotating protrusion 13 is formed so that the central axis of the rotating protrusion 13 is located inward (inside the segment 10a) from the joint surface 10a. Therefore, even if the force which separates the male joint 11 and the female joint 12 acts, the rotation protrusion 13 does not come out of the recessed part 14a.

[Third embodiment]
8A and 8B show a third embodiment of the segment joint structure according to the present invention, wherein FIG. 8A is a perspective view of a male segment having a male joint, and FIG. 8B is a perspective view of a female segment having a female joint. It is.
In the present embodiment, a plurality of male joints 11 and 11 are embedded in the male joint surface 30a with a predetermined spacing interval so as to expose the surface, and the female joint surface 40a also has a plurality of spacing intervals. The female joints 12 and 12 are embedded with their surfaces exposed. In particular, in the present embodiment, when the joint surfaces of the segment 30 and the segment 40 are brought into contact with each other, a recess is formed adjacent to the male joint 11 so that the locking projection 16b formed on the female joint 12 does not interfere. A portion 30c is formed.

  When there is no problem in the joint strength of the joint portion, the joint may not be provided over the entire length of the joint surface as in the first embodiment, but the present embodiment may be used. Thereby, cost reduction of a joint can be aimed at.

  As mentioned above, although embodiment of the joint structure of the segment which concerns on this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, the above embodiments may be used in various combinations, and the locking joints and locking projections used in the second embodiment are used for the male and female joints used in the first embodiment. Alternatively, conversely, the locking grooves and locking projections used in the first embodiment may be used for the male and female joints used in the second embodiment. In the above embodiment, the concrete segment is used. However, it goes without saying that a steel segment or an infilled concrete segment may be used. Furthermore, in the above embodiment, one segment has a male joint on one joint surface and a female joint on the other joint surface. However, a segment having only a male joint and a segment having only a female joint are provided. Each may be formed separately. In short, it is only necessary to obtain the desired function in the present invention.

1A and 1B show a first embodiment of a joint structure of a segment according to the present invention, in which FIG. 1A is a perspective view of a male segment having a male joint, and FIG. 1B is a perspective view of a female segment having a female joint. (A) is an exploded perspective view of a male joint, (b) is an exploded perspective view of a female joint. It is sectional drawing which shows the joining method of a segment similarly. It is sectional drawing of the one edge part which shows the joining method of a segment same as the above. 2nd embodiment of the joint structure of the segment which concerns on this invention is shown, (a) is a disassembled perspective view of a male joint, (b) is a disassembled perspective view of a female joint. It is sectional drawing which shows the joining method of a segment similarly. It is sectional drawing of the one edge part which shows the joining method of a segment same as the above. FIGS. 3A and 3B show a third embodiment of a joint structure of segments according to the present invention, wherein FIG. 5A is a perspective view of a male segment having a male joint, and FIG. 5B is a perspective view of a female segment having a female joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 Male joint 2, 12 Female joint 3, 13 Rotating protrusion 3a, 13a Claw part 3b Locking groove 13b Locking recessed part 4, 14 Male housing 4a, 14a Recessed part 5 Shaft part 6, 16 Female housing 6a, 16a Groove 6b Locking projection 16b Locking projection 10, 30 Male segment 20, 40 Female segment

Claims (4)

By bringing the joint surface of one segment having a male joint on the joint surface and the other segment having the female joint on the joint surface into contact with each other and sliding the mated joint, the female joint is fitted. , A segment joint structure for joining segments,
The male joint is fitted to a rotating projection in which a circumferential wall of a cylindrical member is notched uniformly in the central axis direction to form a claw portion, an outer peripheral surface of the rotating projection, and the center of the rotating projection A concave portion that opens to the joint surface side so that the shaft is substantially positioned on the joint surface, and a semi-cylindrical shaft portion that fits to the inner peripheral surface of the rotating protrusion,
The joint structure of a segment, wherein the female joint is formed by a groove that fits into a claw portion formed on the rotating protrusion and opens to the joint surface side. The segments are joined by sliding the joint surfaces of one segment having a male joint on the joint surface and the other segment having a female joint on the joint surface to fit the male joint and the female joint. A segment joint structure
The male joint is fitted to a rotating projection having a claw portion formed by uniformly cutting a cross-section of a cylindrical member in the central axis direction, and to the outer peripheral surface of the rotating projection, and the center of the rotating projection A recess that opens to the joint surface side so that the shaft is positioned inward from the joint surface;
The joint structure of a segment, wherein the female joint is formed by a groove that fits into a claw portion formed on the rotating protrusion and opens to the joint surface side.   A locking projection is formed at one end of the groove, and a locking groove that fits into the locking projection is formed on the outer peripheral surface at one end of the rotating projection. The joint structure of a segment according to claim 1 or 2.   A locking projection is formed on one end of the groove so as to protrude from the joint surface, and a locking recess is formed on the one end surface of the rotating projection to fit the locking projection. The joint structure of a segment according to claim 1 or 2, wherein

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