JP2527554Y2 - Concrete segment joint structure - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention divides the arc-shaped segment along the bending direction,
The present invention relates to a joint structure of segments joined to each other.

[Prior art] To construct walls such as tunnels and sewers, generally,
Using a plurality of arc-shaped plate-shaped concrete segments (hereinafter simply referred to as segments) which are cylindrical in a connected state,
A method has been adopted in which these are sequentially joined and assembled while being fitted to the wall surface of an underground excavation hole (generally a circular cross section).

Conventionally, when joining these segments to each other, as shown in FIG. 3, a bolt fastening recess 3 is formed on the inner surface near the joining end surface 2 at the end of each segment 1 to be joined to each other. And a recess 3
Then, a bolt insertion hole 5 is formed in the flange portion 4 between the joint end face 2.

Then, the two bolt insertion holes 5 are connected at the same time when the joining end surfaces 2 are joined together, and the bolts 7 are passed through the bolt insertion holes 5.5 from the recesses 3 of one of the segments 1. It is fastened with a nut 9 via a washer 8. In order to allow a bolt to pass from the recess 3 to the bolt insertion hole 5, the segment 1 is formed with a bolt escape hole 6 extending inward from the recess 3 so as to be in line with the bolt insertion hole 5. It is necessary to put it.

FIG. 4 shows a structure in which the joining bolt 7 is passed in two steps in the thickness direction of the segment 1.

[Problem to be Solved by the Invention] In the case of the joint structure in which the segments 1 are joined to each other as described above, since the segments 1 are arc-shaped plates, particularly when joining along the circumferential direction, the following is required. There was such an inconvenience.

That is, the thickness (cover) between the recess 3, the bolt insertion hole 5, or the bolt escape hole 6 and the outer surface of the segment 1 is reduced, and the bonding strength of the flange portion 4 and the strength against external pressure such as earth pressure are reduced. Shortage is a concern. If the thickness of the segment 1 is increased to cope with this, the weight becomes large and the workability is hindered.

In addition, when it is desired to increase the thickness (length in the circumferential direction) of the flange portion 4 to increase the strength, when the outer diameter is small, when the beam height is small, or when it is desired to use a two-stage bolt as shown in FIG. Alternatively, when these are combined, it is difficult to secure sufficient strength in any case, which has been a limiting factor in design.

The present invention has been made in view of the above-mentioned problems, and the cover between the fastening recess or the bolt insertion hole and the outer surface of the segment can be made larger than that of the conventional one, and as a result, the joining strength is reduced. It is intended to provide an excellent concrete segment joint structure.

[Means for Solving the Problems] The present invention is a joint structure of concrete segments for joining arc-shaped plate-shaped concrete segments to each other along a curved direction, which is made to achieve the above object. A bolt insertion hole, which is curved at the same curvature as the concrete segment and extends between the bolt fastening recesses formed in the vicinity of the joined end face to be abutted, and through which the bolt is inserted from the joined end face side, is formed continuously. A bolt evacuation hole is formed from at least one of the bolt fastening recesses connected by the hole and continuously extending at the same curvature as the bolt insertion hole. ,
The bolt is fastened to the concrete segment with a nut using the bolt fastening recess.

[Action] According to the joint structure of the concrete segment of the present invention, the bolt insertion hole formed between the joint end face in the curved direction and the bolt fastening recess in the arc-shaped plate-shaped concrete segment has a thickness of the concrete segment. Since it is substantially at the center and along the bending direction, by taking a large and uniform covering between the recess and the bolt insertion hole and the outer surface of the concrete segment, it becomes possible to use a long joining bolt, It is possible to improve the joint strength between concrete segments and to design a concrete segment having a smaller thickness.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

FIG. 1 shows a state in which arc-shaped plate-shaped concrete segments (hereinafter abbreviated as segments) 11 are joined in the circumferential direction according to the present embodiment.

As shown in FIG. 2, a rectangular recess 13a is provided along the joining end face 12a on the inner surface (concave side) of each segment 11 near the joining end face 12a in the circumferential direction. A recess 13c corresponding to the joining is provided at the center.

And a flange portion extending from the recess 13a to the joint end surface 12a.
14, two bolt insertion holes 15a are formed at an interval from each other. These bolt insertion holes 15a are formed in a curved shape along the circumferential direction of the segment 11 at substantially the center of the plate thickness of the segment 11. Further, a bolt insertion hole 15c extending in the axial direction of the segment 11 is formed between the flange portion 14 and the concave portion 13 and the joint end surface 12b in the axial direction. These bolt insertion holes 15c are used when joining the segments 11 in the axial direction. Also, the recess in segment 11
In a portion between the recess 13c and the recess 13c, a bolt escape hole 16 having the same curvature that is continuous with each bolt insertion hole 15a is formed.

The bolt evacuation hole 16 and the bolt insertion hole 15a are formed on a curved line that curves their axes at a constant curvature.

Then, the joining end surfaces 12a of the segments 11 are aligned with each other, and at the same time, the two bolt insertion holes 15a are connected to each other, and the bolts 17 having the same curvature as the bolt insertion holes 15a The nuts 19 are fastened to the threaded portions 17a at both ends of the bolt 17 via the washers 18 using the recesses 13a, so that the segments 11 are joined in the circumferential direction.

In this way, in order to join the segments 11 in the circumferential direction, the bolts 17 are passed through the bolt evacuation holes 16 in advance, and then the joining end faces 12a are joined together so that the bolt insertion holes 15a and 15a are continuous, and then The bolt 17 is passed through the bolt insertion holes 15a, 15a, and the nut 19 is screwed into the screw portions 17a at both ends via the washers 18. Since the bolts 17 evacuated to the bolt evacuating holes 16 are inserted into the bolt insertion holes 15a and 15a communicating with each other, there is no need to consider the space for inserting the bolts 17 from the inner side of the segment 11 into the concave 13a, and the concave 13
a can be formed small. Further, the recess 13a can be formed to be separated from the joint end face 12a because a long bolt 17 can be used by the bolt escape hole 16.

According to the joint structure in the circumferential direction of the segment 11 of the present embodiment, since the bolt insertion hole 15a formed in the flange portion 14 is formed along the curved direction of the segment 11, the concave portion 13a is small and joined. Since it can be formed at a position separated from the end face 12a, the cover between the recess 13a and the outer surface of the segment 11 and the cover between the bolt insertion hole 15a and the outer surface of the segment 11 can be made large and uniform. For this reason, along with the fact that a longer flange portion 14 can be formed than before, by using a long bolt 17 corresponding thereto, the joining strength between the segments 11 can be improved, and the plate thickness of the segment 11 can be reduced, It is also possible to improve the above.

In the case of the segment 11 of the present embodiment, the bolt escape hole
The bolt escape hole 16 is formed to be continuous with the bolt insertion hole 15a, so that these holes are formed by a series of bolt insertion holes 15a and bolt escape holes 16a. It is 3 holes using long bolts
It is possible to join more than one segment 11 in the circumferential direction. For this reason, by joining more than two conventional segments with the same bolt, the dimensional error in the entire wall to be constructed is reduced, and the workability at the time of joining is improved,
The joint strength can be further improved.

[Effects of the Invention] As described above, according to the joint structure of the concrete segment of the present invention, the concrete segment is the same as the concrete segment over the bolt fastening recesses formed near the joint end faces of the concrete segments that abut each other. The bolt insertion hole into which the bolt is inserted from the joint end face side is formed continuously, and the same curvature is continuously formed with the bolt insertion hole from at least one of the bolt fastening recesses connected by the bolt insertion hole. A bolt evacuation hole extending in the direction is formed, and a bolt that curves at the same curvature as the bolt insertion hole is passed through these bolt insertion holes, and the bolt is fastened to the concrete segment by a nut using the bolt fastening recess. Since the bolt fastening recess can be formed small and separated from the joint end face, the bolt fastening recess can be formed. And the outer surface of the concrete segment, and between the bolt insertion hole and the outer surface of the concrete segment. This has the effect of making it possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete segment joined circumferentially according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the joint structure, and FIGS. 3 and 4 each show a conventional joint structure. It is sectional drawing. 11… Concrete segment, 12a ・ 12b… Fitting end face, 13a ・ 13b ・ 13c …… Bolt fastening recess, 15a ・ 15b ・ 1
5c Bolt insertion hole, 16 Bolt escape hole, 17 Bolt, 19 Nut.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Suzuki 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Building Materials Co., Ltd. (72) Inventor Hirohide Hashimoto 2-chome Yaesu, Chuo-ku, Tokyo No. 6-21 Loose Bay Yaesu Building Ishikawajima Building Materials Co., Ltd.

Claims (1)

(57) [Scope of request for utility model registration] 1. A concrete joint structure for joining arc plate-shaped concrete segments to each other along a curved direction, wherein the concrete segments have bolt fastening recesses formed in the vicinity of joint end faces of the concrete segments which abut each other. Over the gap, curved at the same curvature as the concrete segment, and formed continuously with bolt insertion holes into which bolts are inserted from the joint end face side, and bolt insertion through at least one of the bolt fastening recesses connected by the bolt insertion holes. A bolt evacuation hole extending at the same curvature continuously with the hole is formed, and a bolt curved at the same curvature as the bolt insertion hole is passed through these bolt insertion holes, and the bolt is concreted by using the bolt fastening recess. A joint structure for a concrete segment, wherein the joint is fastened to the segment with a nut.