JPH09310584A - Joint structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operating efficiency by facilitating the mutual connection operation of segments. SOLUTION: A male joint 3 is installed to the joint surface 2 of a male type segment 1A, and a female joint is mounted on the joint surface of a female type segment. The female joint is constituted of an engaging plate with a notched section. A bolt 9 is disposed in upright to a base plate 6, and the male joint 3 is configured. The joint surfaces 2 of segments 1 are slid mutually, the engaging plate is inserted between the base plate 6 and the head 11 of the bolt 9 while fitting the bolt 9 into the notched section of the engaging plate of the female joint, and the head 11 of the bolt 9 is retained on the rear side of the engaging plate. A belleville spring 11a inclined towards the base end side of the bolt 9 towards the central direction is set up on the bottom side of the head 11 of the bolt 9. A tapered surface is formed on the rear side at the end section of the notched section of the engaging plate, with which the head 11 of the bolt 9 is brought into contact through the belleville spring 11a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a segment that forms a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them to each other.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a so-called shield construction method is generally used in which segments (mainly made of concrete or steel) are assembled on the inner surface side of an excavation hole to construct a tubular wall body. As the segments used in this shield construction method, those having a rectangular shape in a plan view and an arc plate shape are mainly used, and these segments are joined together by bolts. When joining the segments by the bolts, a joint plate having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other is buried in the vicinity of the joint surface of the segments. In general, a bolt is inserted into a hole of the above, and a nut is fastened and joined to the bolt. Further, there is also a structure in which an insert fitting as a nut member is embedded in each segment, and bolts penetrating adjacent segments are fastened to each other for joining.

[0003]

However, in the above structure, a bolt is inserted into a hole formed in a joint surface of a joint at a construction site, and a nut is fastened to the bolt or embedded in a mutual segment. Since an extremely complicated operation of fastening bolts to the insert fittings is required, there is a limit in shortening the assembling time, and adaptation to automatic assembling by a robot has been difficult. Furthermore, even if the secondary lining is omitted, it is necessary to close the bolt box formed in the segment in order to install the bolt and nut, and a new joint is aimed at speeding up the construction and saving labor. At present, the development of the structure was urgently needed.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a joint structure of segments that can easily and surely join segments to each other.

[0005]

In order to achieve the above object, a joint structure for a segment according to a first aspect of the present invention is configured such that the joint surfaces of the segments are slid so that the joint surfaces are joined together. In the joint structure, on one of the joint surfaces, a base plate, a rod body erected on the base plate with the base plate side as a base end, and the rod body provided at the tip of the rod body. Also has a male joint formed with a locking portion formed to have a large diameter, and a cutout portion into which the rod body can be laterally fitted is formed on the other joint surface, and the rod body is formed in the cutout portion. While sliding and fitting, by fitting between the locking portion of the rod and the base plate,
There is a female joint for locking the locking portion on the back side, and a disc spring inclined toward the base end side toward the center direction is provided at a contact portion of the locking portion of the male joint with the locking plate. The disc spring is provided, and the contact resistance is absorbed when the disc spring comes into contact with the locking plate.

[0006] The joint structure of the segment according to claim 2 is
2. The segment joint structure according to claim 1, wherein a contact portion of the locking plate with the locking portion is a tapered surface that guides the locking portion to a rear surface side of the locking plate. I am trying.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a segment joint structure according to the present invention. 1 to 4, reference numeral 1 denotes a segment. This segment 1
Is a concrete segment formed in a trapezoidal shape in plan view, and the circumferential joining surface 2 is formed of an arcuate plate inclined with respect to the axial direction of the excavation hole, respectively, and is joined in the circumferential direction. By doing so, a ring constituting the cylindrical wall body is constructed. These segments 1 are composed of a male segment 1A and a female segment 1B, and the male segments 1A and the female segments 1B are alternately connected in the circumferential direction. The male segment 1A is provided with a male joint 3, and the female segment 1B is provided with a female joint 4 to which the male joint 3 of the male segment 1A is joined.

As shown in FIGS. 5 and 6, the male joint 3
A base plate 6 having a hole 5 formed substantially at the center, a cap nut 7 fixed at a communication position with the hole 5 on the back side of the base plate 6, and a back nut fixed to the back side of the base plate 6. A pair of side plates 8 and bolts (rods) that are inserted into the holes 5 from the surface side of the base plate 6 and fastened to the cap nuts 7 so that the base plate 6 is protruded from the base end as a base.
The side plate 8 is provided with an anchor 10 for fixing the male joint 3 to the segment 1. The head 11 of the bolt 9 of the male joint 3 serves as a locking portion, and a disc spring 11a inclined toward the base toward the center is provided on the bottom side of the head 11 of the bolt 9. ing. In addition, the bolt 9 that constitutes the male joint 3
The stepped portion 21 is formed in the head 21. The screwed amount of the bolt 9 is restricted by the stepped portion 21, and the head 1 of the bolt 9 is
The distance between the outermost peripheral side of the disc spring 11a provided on the bottom side of the base plate 1 and the surface of the base plate 6 is set to a predetermined dimension.

[0009] As shown in FIG.
A pair of side plates 14 are fixed to the back side of the locking plate 13, and a bottom plate 15 having an L-shaped cross section is provided between the side plates 14. . The female joint 4 is attached to the side plate 14 by the segment 1.
An anchor 16 is provided for fixing to The notch 12 of the locking plate 13 of the female joint 4 is formed in a tapered shape in which the vicinity of the end gradually widens toward the end, and further, is formed on the back surface side of the locking plate 13 near the end of the notch 12. Is formed with a tapered surface 17 that is inclined from the end to a direction that gradually increases in thickness. The dimension between the base plate 6 of the male joint 3 and the outermost peripheral side of the disc spring 11a is determined by the female joint 4 having the above-mentioned configuration.
The thickness dimension of the locking plate 13 constituting the above is substantially the same as or slightly reduced.

[0010] In order to join the male segment 1A having the male joint 3 and the female segment 1B having the female joint 4, the male segment 1A and the female segment 1B are slid together. Female segment 1
The bolt 9 constituting the male joint 3 of the male segment 1A is engaged with the notch 12 of the locking plate 13 constituting the female joint 4 of B. That is, the bolt 9 of the male joint 3 is connected to the locking plate 1 of the female joint 4.
3 while inserting the bolt 9 into the notch 12 of the male joint 3.
The male segment 1A and the female segment 1B are slid so that the locking plate 13 of the female joint 4 is fitted between the disc spring 11a provided on the bottom side of the head 11 and the base plate 6. By doing so, the disc spring 11a provided on the bottom side of the head 11 of the bolt 9 abuts the tapered surface 17 of the locking plate 13, and is guided in the inclined direction of the tapered surface 17 so that the back surface of the locking plate 13 is guided. Step into the side.

As a result, the male joint 3 is pulled to the female joint 4 side together with the bolt 9, and the male segment 1A and the female segment 1B are firmly pressed together at their joint surfaces 2 as shown in FIG. It is joined in the state where it was repaired. Further, by inserting the locking plate 13 between the disc spring 11a of the head 11 of the bolt 9 and the base plate 6 which are spaced at the same size as or slightly smaller than the thickness of the locking plate 13, these male and female members are inserted. The joint 3 and the female joint 4 are firmly joined. Here, the disc spring 11a of the head 11 of the bolt 9 and the base plate 6
The distance between the head and the head of the bolt 9 of the male joint 3 is the same as or slightly smaller than the thickness of the locking plate 13.
Since the disc spring 11a provided on the bottom side of 1 is elastically deformed, the contact resistance between the head 11 of the bolt 9 and the tapered surface 17 of the locking plate 13 is absorbed at the time of joining with the female joint 4, and as a result, The head 11 of the bolt is guided extremely smoothly to the back side of the locking plate 13 along the tapered surface 17 of the locking plate 13. That is, in the case of using only a normal bolt, the back surface side of the locking plate 13 is scraped by the head of the bolt 9 and is easily corroded, but according to the example of the present embodiment, the bolt 9 is used. Since the disc spring 11a provided on the bottom side of the head 11 absorbs the contact resistance with the locking plate 13, the back surface of the locking plate 13 can be protected without scraping the back side of the locking plate 13. Guided to the side, locking plate 13
It is guided very smoothly to the locking position on the back side of.

As described above, according to the segment joint structure of the present embodiment, the male segment 1A is inserted into the notch 12 formed in the locking plate 13 of the female joint 4 of the female segment 1B. By inserting the bolt 9 provided on the male joint 3, the head 11 of the bolt 9 is very easily locked on the back side of the locking plate 13, and the male segment 1A and the female segment are locked by the locking force. 1B can be joined in the circumferential direction to form a ring. As a result, compared to the conventional fastening structure using bolts and nuts or the fastening structure for fastening bolts to inserts,
The labor required for joining the segments 1 can be greatly reduced, and automatic assembly by a robot can be facilitated. Further, since there is no bolt box or the like, there is no need to close the bolt box. Can be. Further, the back surface near the notch 12 of the locking plate 13 of the female joint 4 is a tapered surface 17, and the head 11 of the bolt 9 of the male joint 3 is guided to the back surface of the locking plate 13 by the tapered surface 17. The female joint 4 and the male joint 3 are attracted to each other by engaging the head 11 of the bolt 9 of the male joint 3 with the notch 12 of the locking plate 13 of the female joint 4. The joining surface 2 of the mold segment 1B and the joining surface 2 of the male segment 1A can be joined very firmly.

Further, since the disc spring 11a is provided on the bottom side of the head 11 of the bolt 9 of the male joint 3, the female joint 4 is formed.
The contact resistance with the locking plate 13 at the time of joining with
It can be absorbed by and guided to the back side of the locking plate 13 very smoothly along the tapered surface 17 of the locking plate 13. In other words, unlike the case where only a normal bolt is provided, the back surface side of the locking plate 13 is not scraped by the head of the bolt and is easily corroded.

In the male joint 3 described above, the step portion 21 is provided on the bolt 9 to secure the distance between the head 11 and the base plate 6, but as shown in FIG. A spacer 22 having a predetermined length may be attached, and the spacer 22 may secure a space between the head 11 and the base plate 6. Further, it goes without saying that the segment 1 is not limited to concrete and may be steel.

[0015]

As described above, according to the segment joint structure of the present invention, the following effects can be obtained. According to the joint structure of the segment according to claim 1, by inserting the rod provided on the male joint from the side into the notch formed in the locking plate of the female joint,
The locking part at the tip of the rod is locked to the back side of the locking plate,
The segments can be joined together by the locking force. As a result, compared to the conventional bolt-and-nut fastening structure or the fastening structure for fastening a bolt to an insert, the labor required for joining the segments can be significantly reduced and the robot can be easily assembled automatically. In addition, since there is no bolt box or the like, the work of closing the bolt box can be omitted. Further, since the disc spring is provided in the locking part of the male joint, the contact resistance with the locking plate can be absorbed by the disc spring and significantly reduced when the female joint is joined. The part can be guided extremely smoothly to the locking position on the back surface of the locking plate. That is, since the contact resistance is large, for example, when the locking plate is made of metal, there is no possibility that the locking plate is shaved and easily corroded.

According to the second aspect of the joint structure of the present invention, the engaging portions of the rod body of the male joint are guided to the tapered surface of the engaging plate of the female joint by sliding the segments to each other. Since it can be guided to the locking portion on the back surface side of the stop plate, the joining work can be further facilitated.

[Brief description of drawings]

FIG. 1 is a plan view of segments to be joined to each other, which illustrates a joint structure for segments according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a segment joining portion for explaining the segment joint structure according to the embodiment of the present invention.

FIG. 3 is a perspective view of a male segment having a male joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 4 is a perspective view of a female segment having a female joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 5 is a perspective view of a female joint and a male joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 6 is a sectional view of a male joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view of a segment joining portion for explaining the segment joint structure according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a male joint for explaining another structure of the male joint used for the joint structure of the segment according to the embodiment of the present invention.

[Explanation of symbols]

 1 segment 1A male type segment 1B female type segment 2 joining surface 3 male joint 4 female joint 6 base plate 9 bolt (rod) 11 head (locking part) 11a disc spring 12 notch 13 locking plate 17 taper surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenta Matsubara 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo headquarters (72) Inventor Hiroki Someya 2-6-21 Yaesu, Chuo-ku, Tokyo Ishikawa Shima Kenzai Kogyo Co., Ltd. (72) Inventor Okayama recommended 2-6-21 Yaesu, Chuo-ku, Tokyo Ishikawa Shima Kenzai Kogyo Co., Ltd.

Claims (2)

[Claims] 1. A joint structure of a segment for joining the joining surfaces of the segments by sliding the joining surfaces of the segments, wherein one joining surface has a base plate and the base plate has a base plate. Has a male joint made up of a rod standing upright with the side as a base end and a locking portion formed at the tip of this rod and having a diameter larger than the rod, and the other joint surface Is formed with a cutout portion into which the rod body can be fitted from the side, and while the rod body is slid and fitted into the cutout portion, the cutout portion is formed between the locking portion of the rod body and the base plate. The male joint has a female joint that locks the locking portion on the back side, and the locking portion of the male joint is in contact with the locking plate at the base end side toward the center. A disc spring inclined to
A segment joint structure, wherein the disc spring absorbs the contact resistance when the disc plate comes into contact with the locking plate. 2. The contact portion of the locking plate with the locking portion is a tapered surface that guides the locking portion to the back surface side of the locking plate. Joint structure of the segment.