JP2000345796A - Segment for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide segments for a tunnel in which the main bodies of neighboring segments can be coupled together with strong jointing force and a dovetail member hardly comes off. SOLUTION: In these segments for a tunnel, dovetail groove portions 3 are provided, which face each other when both the butt portions 1a are butted at the respective butt portions 1a of the main bodies 1 of a pair of tunnel segments to be assembled adjacently; dovetail members 5 equipped with enlarged head portions 4 freely suitable respectively along both the dovetail groove portions 3 are provided on both side portions; outer side portions of the dovetail members 5 are formed in such a manner that both the enlarged head portions 4 are separated further when the position comes forward in fitting direction; and when both butt portions 1a are butted, both the dovetail groove portions 3 are so formed that the portions corresponding to the outer side portion of both the dovetail members 5 are separated further as the position comes frontward in the fitting direction of the dovetail members 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pair of tunnel segments which are assembled adjacent to each other, and each of the butting portions is provided with a dovetail portion facing each other with the butting portions facing each other. The present invention relates to a tunnel segment provided with dovetail members provided on both sides with enlarged heads which can be individually fitted along a groove.

[0002]

2. Description of the Related Art Conventionally, as this kind of tunnel segment, the dovetail member is formed to have the same cross-sectional shape over the entire length of the dovetail groove in the fitting direction, and the dovetail members are formed to have the same depth over the entire length of the groove. There was one that had formed.

[0003]

According to the above-described conventional tunnel segment, a pair of tunnel segment bodies (hereinafter simply referred to as segment bodies) is connected to each other by connecting the butted portions of the two segment bodies. By disposing the dovetail members in the dovetail grooves in a state where they are butted against each other and keeping the arrangement as they are, the two segment main bodies are connected to each other. However, in order to smoothly insert the dovetail member into the dovetail portion, it is necessary to provide an appropriate “play” between the dovetail portion and the dovetail member fitted into the dovetail portion, and the “play” is required.
Due to the provision of, the connected adjacent segment bodies are not rigidly joined to each other, the gap between the butting surfaces of both segment bodies is opened, and groundwater infiltrates the tunnel from that portion,
There is a problem in that there is a risk of breakage at the joint of the segments due to stress concentration.

Further, when the dovetail member is fitted upward, for example, along the radial direction of the tunnel, the dovetail member comes out of the dovetail groove portion and falls due to vibration or the like transmitted to the segment body. There is a danger that the connection of the annularly joined segment bodies will be broken and fall.

Therefore, the present invention solves the above problems,
Adjacent segment bodies can be connected with strong joining force,
Moreover, the object is to provide a tunnel segment in which the dovetail member is hard to be detached.

[0006]

In order to achieve the above object, the characteristic structure of the tunnel segment in the present invention is as follows.
Ants provided on both sides with enlarged heads that can be individually fitted along the both dovetails into the two dovetails facing each other with the butting portions of a pair of tunnel segment bodies assembled adjacent to each other. Along with the fitting of the member, a tapered surface for bringing the two butted portions relatively close to each other is provided on the dovetail groove and the dovetail member, respectively.

[0007] The dovetail member is formed so that both enlarged heads are separated from each other in a forward direction in the fitting direction.
Spaces for the enlarged head fitting in the both dovetails,
The ant member may be formed so as to be further away from the front in the fitting direction of the dovetail member.

[0008]

According to the characteristic structure of the tunnel segment in the present invention, since the tapered surface is provided separately in the dovetail portion and the dovetail member, the dovetail portion is provided in each dovetail portion of both adjacent segment bodies. With the fitting of the member, a force in the direction in which the two segment bodies approach each other acts between the dovetail portion of the dovetail portion and the tapered surface of the dovetail member that are in contact with each other,
Both segment bodies can be connected in a state where they are pressed against each other by their abutting surfaces. Therefore, even if "play" for facilitating the fitting operation is formed in the dovetail groove and the dovetail member, in the connected state, the two segment bodies are in a state where the pressing force is applied together at the butting surfaces. As a result, it becomes possible to join the adjacent segment bodies more strongly, so that it is possible to prevent the gap between the butting surfaces from opening or water leaking from that portion as in the related art. At the same time, it is possible to expect an increase in the joining strength due to an increase in the frictional force between the two segment bodies.

Further, the dovetail groove and the dovetail member in the connected state of the two segment bodies can come into contact with each other on the entire tapered surface, and a pressing force acts on the two tapered surfaces. With this configuration, a frictional force proportional to the pressing force can be expected between the two tapered surfaces, the coupling force is increased to increase the frictional force, and the dovetail member falls out of the dovetail groove. Can be prevented. On the other hand, as described above, the connection operation is a simple operation of merely fitting the dovetail members into both dovetail grooves, and thus can be performed by mechanization.

The dovetail member is formed such that both enlarged heads are separated from each other in a forward direction in the fitting direction (closer in a rearward direction in the fitting direction). In this state, if the enlarged head insertion spaces in the both dovetails are formed so as to be separated from each other in the insertion direction of the dovetail member, it is necessary to fit the dovetail members into the both dovetails. Accordingly, the two enlarged heads formed so as to be closer to the rear in the insertion direction enter the enlarged head insertion space of the two dovetails, and as the penetration deepens, the two dovetails are both enlarged. It is guided by the head and guided in a relatively close direction. That is, by deepening the insertion of the dovetail member, the two segment main bodies can be pulled and strongly joined. In addition, in a state where an external force such as earth pressure or water pressure along the thickness direction acts on the segment body connected and annularly assembled in this manner, the dispersion force of the external force in the segment circumferential direction is Since it acts in the direction of pressing the circumferentially adjacent segment bodies, the dovetail member fitted into the both dovetails is subjected to a force in a direction to further deepen the dovetail into the dovetails, and It is possible to prevent the dovetail member from coming off the groove, and it is difficult for the dovetail member to fall out even if the dovetail member is fitted upward.

[0011]

Therefore, according to the tunnel segment of the present invention, it is possible to connect adjacent segment bodies with a strong joining force by a simple operation, and to make it difficult for the dovetail member to come off. In addition, the safety of the shield tunnel is improved, and the adaptability to the shield tunnel for mechanizing the segment connection work can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the tunnel H is formed by assembling a plurality of tunnel segment bodies (hereinafter simply referred to as segment bodies) 1 in an annular shape along the tunnel circumferential direction, and connecting and fixing them together. It is formed by constructing the side wall peripheral wall X. When constructing the tunnel H, a shield tunnel excavator 2 having a cutter 2a at a front end and a propulsion jack 2b at a rear end is driven by a propulsion reaction force applied to the segment body 1 assembled on the side wall X of the lateral hole. By extending the jack 2b, while moving along the longitudinal direction, the cutter 2a is rotated around the tunnel axis P to dig in the ground, and the propulsion distance per ring of the segment body 1 (generally, 100cm / ring
After the propulsion, the propulsion jack 2b
Is contracted, and the segment main body 1 is sequentially installed between the propulsion jack 2b and the segment main body 1 of the side wall peripheral wall X.

The segment body 1 is made of a casting, and is shown in FIG.
As shown in (1), it is formed in a shape curved along the tunnel circumferential direction. Also, butting portions 1a, 1 with respect to the segment body 1 to be assembled adjacently are provided at both ends in the tunnel circumferential direction and both ends in the tunnel axis direction.
b is provided separately for each. In addition, the butting portions 1a, 1b
A sealing member installation groove 1c for sealing the space between adjacent segment bodies 1 over the entire circumference along the butting parts 1a and 1b to prevent water leakage from the back side of the segment body 1 into the tunnel H. Is provided.

Next, a description will be given of the tunnel segment of the present embodiment. As shown in FIGS. 3, 4 and 5, the butting portions 1a of a pair of segment bodies 1 which are assembled adjacent to each other in the circumferential direction of the tunnel. The opposing dovetail grooves 3 are separately provided in a state where the butting portions 1a are butted with each other,
Enlarged head 4 that can be individually fitted along both dovetails 3
Are provided on both sides.
(See Fig. 4)

The dovetail member 5 includes a flat dovetail body 5a.
Are provided on both sides of the dovetail body 5a, each having a columnar enlarged head 4 provided along the longitudinal direction, and fitted into the dovetail groove 3 along the longitudinal direction of the dovetail body 5a. It is formed so that it can be done. On the outer peripheral surface of the both enlarged heads 4, the dovetail members 5 are inserted into the opposed dovetail grooves 3.
Is provided with a tapered surface 6 for bringing the two butting portions 1a, 1a relatively closer to each other as the fitting is performed. Further, both enlarged heads 4 are tapered to facilitate insertion into the dovetail groove 3.

The dovetail portion 3 is provided at the front and rear ends of the butting portion 1a in the tunnel axis direction along the tunnel axis direction (see FIG. 1), and the butting portion 1b is provided.
The end is opened. Further, the dovetail member 5 is configured to be fitted into the dovetail groove 3 along the tunnel axis direction from the opening (FIGS. 4 and 5).
reference). The dovetail member 5 is provided at the bottom of the dovetail groove 3.
Head insertion space 7 for receiving enlarged head 4
The space 7 is formed so as to be more distant from the butting portion 1a toward the front of the dovetail member 5 in the fitting direction. A tapered surface 6 is provided to make the butting portions 1a, 1a relatively close to each other as the dovetail member 5 is fitted into the dovetail member 3.

According to the tunnel segment of this embodiment, the segment bodies 1 to be connected are arranged along the circumferential direction of the tunnel, and the dovetail members 5 are inserted into the dovetail grooves 3 of the two segment bodies 1 along the tunnel axis direction. By being fitted, the tapered surfaces 6 of the dovetail grooves 3 receive a force from the tapered surface 6 of the dovetail member 5 in a direction in which the two segment bodies 1 approach each other, so that the butting portions 1a are pressed against each other. And the two segment bodies 1 can be connected to each other. The dovetail member 5 fitted in the dovetail groove 3
Does not easily come off due to the contact between the tapered surfaces 6.

[Another embodiment] Another embodiment will be described below.

<1> Both enlarged heads 4 of the dovetail member 5
8 (a) and 8 (b), each may be formed in a columnar shape so as to be further away from each other as it is closer to the front side in the direction in which the dovetail groove 3 is fitted. As a result, as the dovetail member 5 is fitted into the dovetail groove 3, the adjacent segment bodies 1 are brought close to each other, and after the segment body 1 is assembled in a ring shape, the dovetail from the dovetail groove 3 is formed. The member 5 can be prevented from falling off. <2> The dovetail member 5 and the dovetail portion 3 are not limited to those formed so that the enlarged heads are separated from each other in the fitting direction as described in the previous embodiment.
As shown in FIG. 7, the enlarged head may be provided along the fitting direction, that is, the butting portions are fitted together with the dovetail members 5 being fitted into the opposed dovetail grooves 3. 1a, a tapered surface 6 for bringing 1a relatively close to each other
The length of the dovetail member 5 may extend over the entire length of the butted portion 1a of the segment body 1. However, in this case, the dovetail groove 3 also needs to be formed so as to correspond to the dovetail member 5.

<3> The dovetail member 5 and the dovetail groove 3 are not limited to those provided so that the direction in which the dovetail member 5 fits into the dovetail groove 3 is along the tunnel axis. It may be arranged so that the dovetail member 5 can be fitted along the tunnel radial direction. In order to prevent the dovetail member 5 from coming out of the dovetail portion 3, an inverted scale portion protruding in a direction in which the dovetail member 3 comes out may be provided.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a shield segment main body according to an embodiment.

FIG. 2 is a longitudinal sectional view showing a shield tunnel.

FIG. 3 is a cross-sectional view of a tunnel segment showing a shield segment according to the embodiment as viewed in the axial direction of the tunnel.

FIG. 4 is a diagram showing a dovetail member of an embodiment.

FIG. 5 is a cross-sectional view illustrating a dovetail portion of the embodiment.

FIG. 6 is a view showing a dovetail member of another embodiment.

FIG. 7 is a cross-sectional view showing a dovetail portion of another embodiment.

FIG. 8 is an operation diagram when the dovetail member of another embodiment is fitted into the dovetail groove portion 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment main body 1a Butt part 3 Dovetail part 4 Enlarged head 5 Dovetail member 6 Tapered surface

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[Procedure amendment]

[Submission date] June 12, 2000 (2006.1.
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

In order to achieve the above object, the characteristic structure of the tunnel segment in the present invention is as follows.
The two butted portions are butted against respective butted portions of a pair of tunnel segment bodies that are assembled adjacently.
The dovetail grooves facing each other are provided separately in the
Equipped with enlarged heads on both sides that can be inserted separately along the part
In the tunnel segment provided with dovetail members,
The outer part of the dovetail member has two enlarged heads,
The two dovetail grooves
The part is abutted with the butting parts,
The parts corresponding to the outer part of the member are
It is formed so as to be more distant toward the front in the fitting direction .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Deleted

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

According to the characteristic structure of the tunnel segment of the present invention, the outer portion of the dovetail member has two enlarged heads.
But, it is formed so as to be more spaced forward in the fitting direction,
The two dovetails are in a state where the butting portions are butted together.
In, the portions corresponding to the outer portion of the both dovetail members,
Formed so as to be more distant toward the front in the fitting direction of the dovetail member
The dovetail members are fitted into the dovetail grooves.
As it moves, it is formed so that it is further away from the front in the insertion direction.
(In other words, the closer to the rear in the insertion direction, the closer
The two enlarged heads are fitted with the enlarged heads of both dovetail grooves.
Enter the required space, and as the approach deepens, the heads expand
The inner peripheral part of the part slides into both
It acts in the direction to draw the client body. That is, the ant
By deepening the fitting of the members,
It becomes possible to attract and strongly join. Also expand
Shape the head along the entire circumference of the inner circumference of the dovetail
If it is formed, when inserting the dovetail member into the dovetail groove
The entire circumference of both enlarged heads evenly contact the inner circumference of the dovetail groove.
To improve the guide action,
It will be easier to get in quickly. Therefore, during the fitting,
The posture is distorted and caught, and it is very difficult to
Can be easier to prevent
This makes it possible to improve the efficiency of assembly work. on the other hand,
Segments connected in this way and assembled in a ring
In a state where external force such as earth pressure or water pressure acts on the ring
In this case, the dispersion force of the external force in the segment circumferential direction is
Direction in which segment bodies adjacent to each other are pressed
Will work. At that time, the segment bodies
The force acting in the direction of pressing the inner peripheral surface of the dovetail
Transmitted to the outside of the enlarged head from the
Dovetail members so that the parts are separated from each other toward the front in the insertion direction
And the corresponding dovetail
By being formed in a similar manner,
The dovetail members that have been inserted into the dovetails are further deepened.
The force acts in the direction of
It is possible to prevent the re-member from coming off. This work
For use, the dovetail entry is located at the edge of the segment body.
Even if it is provided in an open state, the inner circumference of the segment body
Even if it is provided in an open state on the surface, the same expectations
In particular, upward from the inner circumference of the segment ring
In an installation situation where the ant member is fitted,
It is possible to prevent the falling off of the re-member.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Deleted

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Sato 7-1-2-22 Minamienkajima, Taisho-ku, Osaka-shi, Osaka Inside Kubota-Enkajima Plant (72) Inventor Tsutomu Aiba Minami, Taisho-ku, Osaka-shi, Osaka 7-1-2-22 Enkajima Inside Kubota Enkajima Plant Co., Ltd. (72) Inventor Satoru Ishii 7-1-22-2 Minamienkajima Plant Taisho-ku, Osaka City, Osaka Inside Kubota Enkajima Plant

Claims (1)

[Claims] 1. A pair of tunnel segment bodies which are assembled adjacent to each other are provided with separate dovetails facing each other in a state where the two butted portions are abutted with each other, and separately provided along the both dovetails. A tunnel segment provided with dovetail members having enlarged heads that can be fitted on both sides thereof, wherein the outer portion of the dovetail member is formed so that the two enlarged heads are separated from each other as they move forward in the fitting direction. The two dovetail grooves are formed such that portions corresponding to the outer portions of the two dovetail members are separated from each other in a state in which the butted portions are abutted with each other as they are further forward in the fitting direction of the dovetail members. Segment.