JP2504508Y2 - Joining structure of segments - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a segment joining structure for joining a pair of arc-shaped segment segments to be connected to each other along their circumferential edges.

[Prior art]

Conventionally, the segment is formed in an arc plate shape having a curvature corresponding to the curvature of the inner wall of the drill hole. To assemble the segment to the inner surface of the drill hole, the flat joint end faces along the axial direction of the drill hole in the segment are sequentially joined to form a ring body on the inner wall of the drill hole, and further along the circumferential direction of this ring body. New ring bodies are sequentially joined to and joined to the flat joint end face. Here, in order to connect the joint end faces along the circumferential direction of the segments, the joint fittings embedded in these joint end faces are connected by bolts, and by these bolts, for example, adjacent rings caused by an earthquake It is designed to withstand the shearing forces acting on the two body segments.

However, in the above-described conventional joining structure of segments, the flat joining end faces of two segments forming different ring bodies are joined to each other and are joined by bolts. In order to increase the resistance force that resists the shearing force, it is necessary to increase the diameter of the bolt, which results in a high manufacturing cost of the bolt. Moreover, since the resistance to the shearing force depends on the thickness of the bolt, there is a drawback that there is a limit to increasing the resistance. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a segment capable of increasing resistance to shearing force.

[Means for Solving the Problems]

The segment joining structure according to the present invention is a segment joining structure for joining a pair of arcuate plate-shaped segments to be connected to each other along their circumferential end faces and joining one segment along the circumferential direction. On the end surface, a plurality of convex portions and a plurality of concave portions are formed alternately and at equal pitches along the circumferential direction, and on the joint end surface of the other segment joined to this joint end surface, the plurality of convex portions and It is characterized in that a plurality of concave portions and a plurality of convex portions that fit into the plurality of concave portions are formed alternately and at equal pitches along the circumferential direction.

[Action]

According to the segment joint structure of the present invention, even when a shearing force is applied to a surface substantially orthogonal to the axial direction of the drill hole, the plurality of concave portions and the plurality of convex portions formed on the joint end surfaces of the two segments are provided. Since they are fitted to each other, the resistance to the shearing force is increased. Therefore, the degree of dependence on the bolt for connecting the joint fitting is reduced, and for example, the diameter of the bolt for connecting the segments can be reduced, and the cost can be reduced.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that FIG. 1 (a) is a side view of the segment as seen from the joint end face side along the circumferential direction of the excavation hole, and FIG. 1 (b) is an inner view of the segment as seen from the inside direction of the excavation hole. FIG. 3 is a front view showing the end face of a ring body formed by connecting six segments, and FIG. 3 is a side view showing a state in which the jack A of the shield excavator is in contact with the segment. As shown in FIG. 1 (a), the segment 1 is made of concrete and has an arc plate shape with a central angle of 60 degrees. A joint fitting 3 is embedded in a joint end face 2 along the axial direction of the drill hole, and a bolt (not shown) is inserted into a through hole 3a formed in the joint fitting 3 to connect two adjacent segments 1. It is supposed to be done. That is, by connecting the six segments 1 in the circumferential direction, the ring body 4 as shown in FIG. 2 is formed on the inner wall of the excavation hole. Further, in the joint end faces 5 and 11 along the circumferential direction of the segment 1 in the ring body 4 composed of the six segments 1,
As shown in FIG. 3, another segment 1 is joined after propelling the shield excavator. Here, a plurality of (four in this case) convex portions 6 and a plurality of concave portions 7 are alternately and equally arranged along the circumferential direction on one joint end surface 5 along the circumferential direction of the excavation hole in the segment 1. It is formed with a pitch. A slope 8 is connected between the convex portion 6 and the concave portion 7. A joint fitting 9 is attached to the convex portion 6. The joint fitting 9 is formed by welding side plates 9c to both ends of a plate 9b in which a through hole 9a is formed and has a U-shape, and is embedded in the concrete segment 1. Also,
A through hole is formed in a portion surrounded by the plate 9b and the side plate 9c.
A recess 10 is formed as a working space for fastening the bolt passed through 9a with a nut. Further, on the other joint end surface 11, a plurality of convex portions 12 and a plurality of concave portions 13 are formed alternately and at equal pitches. The convex portion 12 and the concave portion 13 are connected by a slope portion 14. Here, the convex portion 12 is formed corresponding to the portion where the concave portion 7 of the one joint end face 5 is formed when the segment 1 is traversed in the axial direction. Also, the recess
Similarly, when the segment 1 is traversed along the axial direction, 13 is formed so as to correspond to the portion where the convex portion 6 of the one joint end face 5 is formed. In this way, the plurality of convex portions 6 and the plurality of concave portions 13 and the plurality of concave portions 7 and the plurality of convex portions 12 respectively formed on the two joining end surfaces 5 and 11 of the adjacent segments 1 are shown in FIG. It is designed to fit. Further, a joint metal fitting 15 having a structure similar to that of the above-mentioned joint metal fitting 9 is attached to the concave portion 13, and when the joint end surfaces 5 and 11 of the adjacent segments 1 are fitted to each other, the joint metal fitting 15 is It is adapted to face the joint fitting 9. In addition, the plurality of convex portions 6 and 12 and the plurality of concave portions 7 described above,
As shown in FIG. 3, the arrangement pitch of 13 is such that at least two of the convex portions 6 and 12 of the segment 1 come into contact with the jack A of the shield excavator. As a result, the jack A of the shield excavator can be stably brought into contact with the shield excavator to propel the shield excavator forward. In the center of the segment 1, a cylindrical hanging metal fitting 16 into which the tip of an arm of an erector (not shown) is screwed when the segment 1 is lifted is embedded, and a grout hole 17 is formed thereby. In the present embodiment, when a shearing force that displaces the adjacent segments 1 in the circumferential direction acts, the plurality of convex portions 6 and 12 and the plurality of concave portions 7 and 13 of the adjacent segments 1 are fitted to each other. Therefore, the joined segment 1 is prevented from being displaced. That is, the resistance to the shearing force can be increased as compared with the conventional segment having a flat joint surface. As a result, the degree to which the joint strength depends on the bolt can be reduced, the diameter of the bolt can be reduced, and the manufacturing cost can be reduced. Further, in this embodiment, the convex portion 6 formed on one joint end face is made to correspond to the concave portion 13 formed on the other joint end face, and the concave portion 7 formed on one joint end face is formed on the other joint end face. Since it corresponds to the convex portion 12, the length between two parallel joint end faces can be made substantially uniform along the circumferential direction, and a narrow portion, that is, a notch is formed between the two joint end faces. Therefore, it is possible to avoid a decrease in the strength of the segment 1 itself. In addition, as shown in FIG. 4, by forming a corner portion between the convex portion 6 (12) and the concave portion 7 (13) to the slope portion 8 (14) into a curved surface, the convex portion 6 (12) and The recesses 7 (13) can be fitted more smoothly and the corners can be prevented from being lost. Further, the numbers of the convex portions 6 (12) and the concave portions 7 (13) formed at equal pitches are not limited to those in the above-mentioned embodiment. For example, as in the segment 20 shown in FIGS. ,
It goes without saying that the number of the convex portions 6 (12) may be eight, which is twice the number in the above-described embodiment, or a number other than this. In the case of this segment 20, mutual connection is made by a bolt that passes through a through hole 21a from a recess 21 provided in the inner surface in the vicinity of each joint end surface 2, 5, 11.

[Effect of device]

As described above, according to the joining structure of the present invention segment, the joining end surfaces of each other along the circumferential direction of the drill hole are
Since the plurality of concave portions and the plurality of convex portions that fit with each other are formed alternately at equal pitches along the circumferential direction, the convex portions and the concave portions are fitted even if shearing force acts on the segment. Therefore, the resistance to the shearing force increases. Therefore, it is possible to easily increase the connection strength of the adjacent segments, and for example, to reduce the diameter of the bolt used for the connection and reduce the manufacturing cost thereof.

[Brief description of drawings]

1 to 3 are views showing a segment according to an embodiment of the present invention, and FIG. 1 (a) is a side view of the segment as seen from a joint end face side along a circumferential direction of a drill hole, FIG. 1 (b) is an inner view thereof, FIG. 2 is a front view showing an end face of a case where six segments are connected to form a ring body, and FIG. 3 shows a jack of a shield excavator abutting on the segment. FIG. 4 is a side view showing a state, FIG. 4 is an enlarged inner view showing a modified example of the convex portion and the concave portion, and FIGS. 5 (a) and 5 (b) are side views showing the other embodiment, respectively. 1,20 …… Segment, 5,11 …… Joint end face, 6,12…
… Convex, 7,13 …… Concave.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruhiko Takayama, Inventor Haruhiko Takayama 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building, Ishikawajima Construction Materials Co., Ltd. (72) Tadao Hirayo Nishishinjuku, Shinjuku-ku, Tokyo 1-25-1 Taisei Construction Co., Ltd. (72) Inventor Kenichi Kaneko Nishi Shinjuku, Tokyo 1-25-1 Taisei Construction Co., Ltd. (72) Inventor Kenichi Hamamoto Nishi Shinjuku-ku, Tokyo Shinjuku 1-25-1 Taisei Construction Co., Ltd. (56) Reference JP-A-51-78037 (JP, A) JP-A-63-176598 (JP, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A joining structure of segments for joining joining end faces along a circumferential direction of a pair of arc plate-shaped segments to be connected to each other, wherein a joining end face along a circumferential direction of one segment is A plurality of convex portions and a plurality of concave portions are formed alternately and at equal pitches along the circumferential direction, and the plurality of convex portions and the plurality of concave portions are provided on the joining end surface of the other segment joined to the joining end surface. A joint structure for a segment, wherein a plurality of concave portions and a plurality of convex portions that are fitted to each other are formed alternately and at equal pitches along the circumferential direction.