JPH0988487A - Joint structure for flexible segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively manufacture a flexible segment which can prevent the collapse of a cylindrical wall body by bending the wall body when an earthquake, uneven settlement of the ground, etc., occurs and, at the same time, to easily join the segment with another segment. SOLUTION: A recessed section 14 is formed in the circumferential direction on the joint surface 12a of a segment main body and a flexible member 15 which can be deformed elastically is put in the section 14. The joint surface 12a of the segment 11 is brought into contact with the joint surface Sa of another segment S and a bolt 17 is passed through the inserting holes 17 of the segments 11 and S communicating with each other. Then a nut 23 is engaged with the protruded end of the bolt 21 with an elastic plate 22 having a thickness T2 which is smaller than the protruded amount of the flexible member 15 from the joint surface 12a of the segment main body 12 in between.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment which constitutes a tubular wall body in the axial direction of an excavation hole by joining a plurality of pieces to each other, and in particular, it is possible to give flexibility to the joining portion. The present invention relates to a joining structure of flexible segments.

[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. By the way, in this shield method, especially when a tunnel is constructed in soft ground, the constructed tunnel may be refracted and collapsed due to an earthquake or uneven settlement of the ground. For this reason,
A ring having appropriate flexibility was interposed in the axial direction of the tubular wall body.

A ring shown in FIG. 15 will be described as an example of this type of ring. In the figure, reference numeral 1 is a flexible ring. This flexible ring 1 is provided with bellows-shaped annular water-stopping rubbers 3 and 4 between a pair of annular frame rings 2, and further on the inner peripheral side,
An annular cover rubber 5 having a cavity is provided. Further, each frame ring 2 is provided with axially movable bars 6 having locking portions 7 made of washers or the like attached to both ends by bolts 8 at intervals in the circumferential direction. It is considered as a structure. Then, according to the tubular wall body provided with the flexible ring 1, when the external force is applied, the space between the frame rings 2 expands and contracts,
The external force is released and the collapse of the tubular wall body is prevented. Further, at this time, the bellows-shaped water blocking rubbers 3 and 4 and the cover rubber 5 provided between the frame rings 2 expand and contract while ensuring water blocking.

[0004]

However, since the flexible ring 1 has a structure that can be bent while ensuring water-stopping property, it is unavoidable that the flexible ring 1 has a complicated structure as described above.
There was a problem that it became extremely expensive.
Further, in such a complicated flexible ring 1, there is also a problem that a large amount of labor is required for the installation work.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive flexible segment joining structure which can be joined very easily.

[0006]

In order to achieve the above object, a flexible segment joining structure according to a first aspect of the present invention connects rings formed by joining segments in a circumferential direction in an axial direction of a drill hole. In the joining structure of the flexible segments provided in the axial direction of the tubular wall body constituted by, the flexible segments are arc plate-shaped segment main bodies that are joined to each other in the circumferential direction, The segment main body is provided with an elastic flexible member disposed in a recess formed in the circumferential direction on the joint surface in the axial direction of the segment main body, and the segment main body is provided on another adjacent segment. It is characterized in that the flexible member is joined so as to be able to approach and separate from the joint surface with a size smaller than the protruding amount of the flexible member. Thereby, for example, when an external force is applied to the tubular wall body from a direction intersecting the axial direction, the flexible member elastically deforms and joins each other at a joint portion between the flexible segment and another adjacent segment. Since the joint surface is capable of approaching and separating with a dimension smaller than the thickness of the flexible member, the cylindrical wall body is bent and external force is released while ensuring the sealing property, and collapse of the cylindrical wall body occurs. To be prevented.

According to a second aspect of the present invention, there is provided a flexible segment joint structure according to the first aspect, wherein the segment body and the other adjacent segment are fastened together by bolts and nuts. An elastic plate having elasticity having a thickness smaller than the protruding amount of the flexible member protruding from the joint surface of the segment main body is interposed at the fastening position of these bolts and nuts. Thereby, for example, when an external force is applied to the tubular wall body in a direction intersecting the axial direction, the flexible members elastically deform at the joint portion between the flexible segment and another segment and the joint surfaces Is separable against the elastic force of the elastic plate having a thickness smaller than the thickness of the flexible member, so that the cylindrical wall body is bent and the external force is released while ensuring the sealing property. The collapse of the wall body is prevented.

According to a third aspect of the present invention, there is provided a flexible segment joint structure according to the first or second aspect, wherein the recess in which the flexible member is disposed is the segment body. It is characterized in that it is formed on either the inner surface side, the outer surface side or the center of the joint surface. Thereby, the joint surface is sealed by the flexible member provided on the outer peripheral side, the inner peripheral side, or the center of the joint surface, and the flexibility at the joint portion is secured. The flexible segment joining structure according to claim 4,
The flexible segment joining structure according to claim 1 or 2, wherein the recesses in which the flexible members are disposed are formed on an inner surface side and an outer surface side of the segment body, respectively. There is. Thus, the joint surface is sealed by the flexible member provided on each of the outer peripheral side and the inner peripheral side of the joint surface, and the flexibility at the joint portion is secured.

According to a fifth aspect of the present invention, there is provided a flexible segment joint structure according to the fourth aspect, wherein the flexible member has a flexible portion disposed in the recess.
It is characterized in that it is integrally formed with a connecting portion that connects these flexible portions. This facilitates the manufacture of the flexible member and simplifies the work of attaching the flexible member to the segment body. According to a sixth aspect of the present invention, there is provided a flexible segment joining structure according to the first aspect, wherein the joining surface of the segment body is provided with a curved portion formed by bending an edge portion on an inner surface side or an outer surface side. It is characterized by being. Thereby, since the curved portion is formed at the edge portion on the inner peripheral side or the outer peripheral side of the segment main body, interference between the edge portions of the segment main body is prevented when the tubular wall body is bent at the joining portion. , Breakage, damage is prevented.

According to a seventh aspect of the present invention, there is provided a flexible segment joint structure according to the first aspect, wherein the joint surface of the segment body is chamfered with an edge portion on the inner surface side or the outer surface side. It is characterized in that a chamfered portion is provided. As a result, since the chamfered portion is formed on the inner or outer edge of the segment body, interference between the edge portions of the segment body is prevented when the tubular wall body is bent at the joint. , Breakage, damage is prevented.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a flexible segment joining structure of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 11 is a flexible segment. The flexible segment 11 is composed of an arc-shaped plate molded from concrete. By joining the flexible segments 11 in the circumferential direction, an annular ring forming a tubular wall body is formed. Has become. A seal material 13 is provided on the end surface of the segment main body 12 that constitutes the flexible segment 11, so that the sealability when the respective end surfaces are joined is ensured.

The joint surface 12a on one side of the segment main body 12 is formed with recesses 14 on the inner peripheral side and the outer peripheral side, respectively.
Flexible members 15 made of, for example, hard rubber or the like are provided along the longitudinal direction 2. These flexible members 15
Has a thickness dimension larger than the depth dimension of the recess 14, and therefore these flexible members 15 are attached so as to project from the joining surface 12a of the segment body 12 by the dimension T1.

Here, reference numeral 16 in the drawing is a recess formed for fastening the segment main bodies 12 to each other with bolts 21 and nuts 23, and reference numeral 17 is an insertion hole into which the bolt 21 is inserted. Then, as shown in FIG.
The bolt 21 is inserted from one recess 16 into the insertion hole 17, and the nut 23 is fastened and fixed to the bolt 21 via the elastic plate 22 in the other recess 16. The elastic plate 2
2, the thickness T2 is slightly smaller than the protrusion amount T1 from the joint surface 12a of the segment body 12 of the flexible member 15.
At (T2 <T1), an elastic material made of rubber or the like is used.

When the flexible segment 11 and another adjacent segment S are joined, the joining surface 12a of the segment body 12 of the flexible segment 11 and the joining surface Sa of the segment S are brought into contact with each other. , The joint surface 12a, Sa by the jack thrust from the shield machine
In a state where the flexible members 15 provided on the segment main body 12 are pressed and compressed by pressing each other, the bolts 18 are inserted from the recesses 16 into the insertion holes 17, and the bolts 21 are inserted into the insertion holes 17.
The nut 23 is fastened and fixed via the elastic plate 22.

According to the tubular wall body T constructed as shown in FIG. 4 with the flexible segment 11 interposed as described above, for example, the tubular wall body T has an earthquake or uneven ground. When an external force for bending the tubular wall body T is applied from a direction intersecting the axial direction due to subsidence or the like, as shown in FIG. 5, on the outer side in the bending direction, it is flexible against the elastic plate 22. The segment 11 is separated from the adjacent segment S,
A gap is formed at these joints, and the compressed flexible members 15 are restored. Further, on the inner side in the bending direction, the flexible member 1 on the inner peripheral side of the tubular wall body T is formed.
5 is slightly restored, and the flexible member 15 on the outer peripheral side is provided.
Is further compressed and elastically deformed.

That is, at the joining portion of the flexible segments 11, the tubular wall body T is slightly bent, so that the external force applied to the tubular wall body T is released and the tubular wall body T moves. Collapse is prevented. Further, at this time, the flexible members 15 are adjacent to each other at the joints S.
Since it is in close contact with the joint surface Sa of the cylindrical wall body T,
Even if is bent, a reliable sealed state can be secured.

As described above, according to the flexible segment 11 of the above-described embodiment, even if an external force is applied to the tubular wall T due to an earthquake or uneven subsidence of the ground, the flexible segment 11 is joined at the joint portion. To the joint surface Sa of the adjacent segments S,
While maintaining the close contact state of the flexible member 15, the tubular wall body T can be slightly bent to release the external force, whereby the collapse of the tubular wall body T due to the external force can be reliably prevented. In addition, it is possible to ensure a good sealing state. Also, simply, the joint surface 12 of the segment body 12
A concave portion 14 is formed in a in the circumferential direction.
4, the flexible member 15 having elasticity is disposed so as to project from the joint surface 12a, so that it has a very simple structure. Therefore, the manufacturing cost can be reduced and the workability can be improved.

Although the nut 23 is fastened to the bolt 21 via the elastic plate 22 in the above-mentioned embodiment, the shield machine is propelled after fastening the bolt 21 and the nut 23 without using the elastic plate 22. When the segment body 12
After the jack thrust applied to the
-Tightening with the nut 23 is performed on the joint surface 12a of the flexible member 15.
It may be loosened slightly with a dimension T2 which is slightly smaller than the protrusion amount T1. Further, as a method of joining the flexible segment 11 and the adjacent segment S, as shown in FIG. 6, joint plates 24 provided on the inner peripheral surface side are fastened and fixed by bolts 21 and nuts 23. A joining method may be used.

Next, a flexible segment joining structure according to another embodiment will be described. (Embodiment A) As shown in FIG.
The protrusions 31 protruding toward the recess 14 of the flexible segment 11 are formed on the inner peripheral side and the outer peripheral side of the joint surface Sa of the adjacent segments S to which the flexible segment 11 is joined. The flexible member 15 by the strip 31
Can be reliably compressed to further improve the waterproofness.

(Embodiment B) As shown in FIG. 8, in this joint structure, a convex curved portion 32 is provided between the recesses 14 of the segment body 12, and the segment body 12
According to the flexible segment 11 having, it is possible to obtain a good turning motion with the contact point between the curved portion 32 and the joint surface Sa of the adjacent segment S as a fulcrum. Further, if the concave curved portion 33 is formed on the joint surface Sa of the adjacent segment S, the curved portion 32 of the segment main body 12 and the curved portion 33 of the adjacent segment S are slid to allow good rotation. You can get the action.

(Embodiment C) As shown in FIG. 9, the flexible member 15 provided in the flexible segment 11 includes a flexible portion 34 provided in the recess 14 and the flexible portions 34. The connecting portion 35 that connects the members to each other is integrally molded, and by integrally molding in this manner, the work of attaching the flexible member 15 to the segment body 12 can be facilitated and the manufacturing cost can be reduced. It can be reduced. Further, as the shape of the joint surface Sa of the adjacent segments S,
It may have a shape provided with a ridge 31 that fits into the recess 14.

(Embodiment D) In the embodiment shown in FIG. 10, a recess 14 having a semicircular cross section is formed in the central portion of a segment body 12, and a flexible member 15 having a circular cross section is arranged in this recess 14. It was set up. Further, in this case, as the adjacent segments S, a recess 36 into which the flexible member 15 is fitted may be formed on the joint surface Sa thereof.

(Embodiment E) In the embodiment shown in FIG. 11, recesses 14 each having a semicircular cross section are formed on the outer peripheral side and the inner peripheral side of the segment main body 12, and the recesses 14 each have a circular cross section. The flexible member 15 is provided. Also,
Also in this case, as the adjacent segments S, the joining surface S
Recesses 36 into which the flexible member 15 fits may be formed in a.

(Embodiment F) In FIG. 12, a recess 14 is formed in the central portion of the segment body 12, and a flexible member 15 having a rectangular cross section is disposed in the recess 14. is there. Further, in this case, as the adjacent segments S,
By forming the ridge 37 that fits into the recess 14 of the flexible segment 11 in the central portion of the joint surface Sa, the flexible member 15 can be reliably compressed.

(Embodiment G) In the embodiment shown in FIG. 13, a recess 14 is formed only on the outer peripheral side of the joint surface 12a of the segment main body 12, and a flexible member 15 is arranged in this recess 14. The curved portion 38 is formed by curving the edge portion on the inner peripheral side of the segment body 12. Further, according to the flexible segment 11, the flexible member 15 ensures good water blocking property, and the curved portion 38 is provided at the edge portion, so that the edge portion of the joint surface 12a is reliably broken and damaged during bending. Can be prevented. Reference numeral 39 is a seal recess in which the seal material is disposed.

(Embodiment H) In the embodiment shown in FIG. 14, a recess 14 is formed only on the inner peripheral side of the joint surface 12a of the segment body 12, and a flexible member 15 is disposed in this recess 14. Further, the chamfered portion 40 is formed by chamfering the edge portion on the outer peripheral side of the segment body 12. Then, according to the flexible segment 11, as in the case of the above-mentioned Embodiment G, the chamfered portion 40 is formed at the edge portion while ensuring good waterproofness by the flexible member 15, so that the joint surface 12a is bent. It is possible to reliably prevent breakage and damage of the edge portion of the. The curved portion 38 may be formed instead of the chamfered portion 40. In each of the above-mentioned embodiments, the segment made of concrete has been described as a segment, but it goes without saying that it can be applied to a segment made of steel.

[0027]

As described above, according to the flexible segment joining structure of the present invention, the following effects can be obtained. According to the joint structure of the flexible segment according to claim 1, the flexible member is elastically deformed at a joint portion between the flexible segment and another adjacent segment, and the joint surfaces of the flexible members are smaller than the thickness of the flexible member. Since it can be separated with a small dimension, for example, when an external force is applied to the tubular wall body from a direction intersecting the axial direction, the tubular wall body is bent to secure the sealing property while the external force is applied. It can be escaped, and thereby, the collapse of the tubular wall body due to an earthquake or uneven settlement of the ground can be reliably prevented. In addition, a very simple structure in which a concave portion is formed in the joint surface of the segment main body in the circumferential direction, and a flexible member having elasticity is disposed in the concave portion so as to project from the joint surface is formed. Therefore, it is possible to reduce the manufacturing cost and improve the workability as compared with the conventional complicated one in which a large number of components are assembled. According to the flexible segment joining structure of the second aspect, when the bolts and nuts are joined together, the nuts are fastened to the bolts via the elastic plates, so that the size of the approach and separation at the joining points can be very easily achieved. Can be secured. That is, the fastening amount of the bolts and nuts can be easily adjusted, and the work can be further simplified. According to the joint structure of the flexible segment according to claim 3, the joint surface can be sealed by the flexible member provided on the outer peripheral side, the inner peripheral side, or the center of the joint surface, and at the joint portion. Flexibility can be reliably ensured.

According to the joint structure of the flexible segment of the fourth aspect, the joint surface can be more surely sealed by the flexible member provided on each of the outer peripheral side and the inner peripheral side of the joint surface. Further good flexibility can be secured at the joint. According to the joint structure of the flexible segment of the fifth aspect, since the flexible member is integrally molded, the flexible member can be easily manufactured and the manufacturing cost can be reduced. Also, the mounting work can be facilitated.

According to the joint structure of the flexible segment of the sixth aspect, since the curved portion is formed at the edge portion on the inner peripheral side or the outer peripheral side of the segment main body, the segment is bent when bent at the joint portion. Interference between the edges of the main body can be reliably prevented, and damage and damage can be reliably eliminated. According to the joint structure of the flexible segment according to claim 7, since the chamfered portion is formed at the inner peripheral side or outer peripheral side edge of the segment main body, the edge of the segment main body is bent when bent at the joint. Interference between the parts can be reliably prevented, and breakage and damage can be surely eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a flexible segment for explaining a joining structure of flexible segments according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a flexible segment and a structure in the vicinity of a joint surface of an adjacent segment for explaining the joint structure of the flexible segment according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a joint portion with an adjacent segment for explaining the joint structure of the flexible segment according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a tubular wall body illustrating a tubular wall body constructed using the flexible segment according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a tubular wall body illustrating a tubular wall body constructed using the flexible segment according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a joining portion with an adjacent segment for explaining another joining structure of the flexible segment according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a joint structure of a flexible segment according to Embodiment A of the present invention and the vicinity of a joint surface of a flexible segment and an adjacent segment.

FIG. 8 is a cross-sectional view showing a joint structure of a flexible segment according to Embodiment B of the present invention and the vicinity of a joint surface of a flexible segment and an adjacent segment.

FIG. 9 is a cross-sectional view illustrating a joint structure of a flexible segment and a vicinity of a joint surface of an adjacent segment, which illustrates a joint structure of a flexible segment according to Embodiment C of the present invention.

FIG. 10 is a cross-sectional view illustrating a joining structure of a flexible segment and an adjacent segment in the vicinity of a joining surface, illustrating a joining structure of the flexible segments according to Embodiment D of the present invention.

FIG. 11 is a cross-sectional view illustrating a joint structure of a flexible segment and a vicinity of a joint surface of an adjacent segment, which illustrates a joint structure of a flexible segment according to Embodiment E of the present invention.

FIG. 12 is a cross-sectional view showing a joint structure of a flexible segment and an adjacent segment in the vicinity of a joint surface according to Embodiment F of the present invention.

FIG. 13 is a cross-sectional view showing a joint structure of a flexible segment according to Embodiment G of the present invention and the vicinity of a joint surface of a flexible segment and an adjacent segment.

FIG. 14 is a cross-sectional view showing a joint structure of a flexible segment and an adjacent segment in the vicinity of a joint surface according to an embodiment H of the present invention.

FIG. 15 is a cross-sectional view around a flexible ring for explaining the configuration and structure of a conventional flexible ring.

[Explanation of symbols]

 11 flexible segment 12 segment main body 12a, Sa joining surface 14 recess 15 flexible member 21 bolt 22 elastic plate 23 nut 34 flexible portion 35 connecting portion 38 curved portion 40 chamfered portion S segment T tubular wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Kobayashi 2-6-21 Yaesu, Chuo-ku, Tokyo Within Ishikawajima Kenzai Kogyo Co., Ltd. (72) Atsushi Koizumi 6-67 Midori-cho, Higashimatsuyama, Saitama Prefecture

Claims (7)

[Claims] 1. A joint structure of flexible segments provided in the middle of an axial direction of a cylindrical wall body constituted by connecting rings formed by joining segments in the circumferential direction in the axial direction of a drill hole. The flexible segment is arranged in a recess formed in a circumferential direction on an arc plate-shaped segment body that is joined to each other in the circumferential direction and a joining surface in the axial direction of the segment body. And a flexible member having elasticity, which is joined to another adjacent segment with a size smaller than the projecting amount of the flexible member projecting from the joining surface of the segment main body so as to be able to approach and separate from each other. A joining structure of flexible segments, characterized in that 2. The segment main body and the other adjacent segment are fastened by bolts and nuts,
An elastic plate having elasticity having a thickness dimension smaller than the protruding amount of the flexible member protruding from the joint surface of the segment body is interposed at the fastening position of the bolts and nuts. 1. The flexible segment joining structure according to 1. 3. The recess in which the flexible member is disposed,
The flexible segment joining structure according to claim 1 or 2, wherein the segment body is formed on an inner surface side, an outer surface side, or a center of the joining surface. 4. The recess in which the flexible member is disposed,
The flexible segment joining structure according to claim 1 or 2, wherein the segment main body is formed on an inner surface side and an outer surface side, respectively. 5. The flexible member is formed by integrally molding a flexible portion disposed in the recess and a connecting portion that connects the flexible portions to each other. Flexible segment joining structure 6. The joining structure for a flexible segment according to claim 1, wherein the joining surface of the segment main body is provided with a curved portion formed by bending an edge portion on the inner surface side or the outer surface side. . 7. The joint structure for a flexible segment according to claim 1, wherein the joint surface of the segment main body is provided with a chamfered portion formed by chamfering an edge portion on the inner surface side or the outer surface side. .