JP3352448B2 - Segment for tunnel - Google Patents

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.
Opposing dovetails are provided separately at the butting portions of a pair of tunnel segment bodies that are assembled adjacent to each other in a state where the butting portions are abutted with each other, and an enlarged head that can be individually fitted along the both dovetail portions. In the tunnel segment provided with dovetail members provided with parts on both sides,
With the slide fitting of the dovetail member into the both dovetail portions
A tapered surface that makes the butting portions relatively close to each other,
Provided on the inner facing surfaces of the enlarged heads facing each other
At the same time, it is also provided in the corresponding part of both dovetail groove,
<br/> ants members both outer sides, respectively a rear portion of the internal surface of the head, Yes formed by inclined to be separated as the front of the fitting ingress direction of the dovetail member, said dovetail member
Corresponding portions of both ant groove to both the outer part also, there is to that is form shape is inclined to be separated as the front of the fitting direction of the ants member.

[0007]

[0008]

According to the characteristic configuration of the tunnel segment of the present invention, the tapered surface is formed by the dovetail groove and the groove.
Since it is provided separately for each member, both adjacent segments
As the dovetail member is fitted into each dovetail portion of the main body,
Of the dovetail groove and the tapered surface of the dovetail member
In the meantime, a force in the direction where both segment bodies approach each other acts
A state in which both segment bodies are pressed against each other by their abutting surfaces
Can be connected. Therefore, if the dovetail
"Play" that facilitates the insertion operation between
However, in the consolidated state, both segments
The main unit is in a state where pressing force is applied together at the butting surfaces.
Joints between adjacent segment bodies more strongly
Is possible, as in the past,
Prevents openings and leaks from that area
And the frictional force between the two segment bodies
It is possible to expect an increase in bonding strength with an increase.
You. On the other hand, as described above, the connection operation
Because it is a simple operation just to insert the dovetail member,
This can be done by mechanization. Also, if the enlarged head is formed in a shape along the entire circumference of the inner peripheral portion of the dovetail portion, when the dovetail member is fitted into the dovetail portion,
The entire circumference of both enlarged heads is evenly in sliding contact with the inner circumference of the dovetail portion, and the guiding action is further improved, so that the dovetail member can easily enter straight. Therefore, it is easy to prevent that the posture of the dovetail member is distorted and caught during the fitting, and it is easy to say that it takes a lot of time to remove and insert it thereafter, and it is possible to increase the efficiency of the segment assembling work. On the other hand, in a state in which an external force such as earth pressure or water pressure acts on the segment rings that are connected and assembled in a ring in this manner, the dispersion force of the external force in the circumferential direction of the segment is adjacent in the circumferential direction. It acts in the direction of pressing the segment bodies. At this time, the force acting in the direction of pressing the segment bodies is transmitted from the inner peripheral surface of the dovetail groove to the outer side of the enlarged head .
Dovetails, each of which is the back side of the inner facing surface
The outer sides of the material are separated further forward in the fitting direction of the dovetail member.
Is inclined to be together are form shape, the ants member
The corresponding portions of both dovetail grooves corresponding to both outer portions are formed in the same manner, so that the dovetail member fitted into the both dovetail portions has a force in a direction to further deeply fit into the dovetail grooves. It becomes possible to prevent the dovetail member from coming off from the dovetail portion. This effect can be expected in the same manner whether the fitting inlet of the dovetail member is provided in an open state at the edge of the segment body or in the state opened in the inner peripheral surface of the segment body. In particular, in an installation state in which the dovetail member is fitted upward from the inner peripheral surface of the segment ring, it is possible to prevent the dovetail member from falling off.

[0009]

[0010]

[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. In constructing the tunnel H, a shield tunnel excavator 2 having a cutter 2a at a front end and a jack 2b for propulsion 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 groove 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
May be provided, and the length of the dovetail member 5 may extend over the entire length of the butting 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 illustrating 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

 ──────────────────────────────────────────────────続 き Continued 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 No. 7-22, Enkajima Kubota Inc. in the Onkajima Plant (72) Inventor Satoru Ishii 7-1-22 Minamienkajima, Taisho-ku, Osaka-shi, Osaka In the Kubota Onkajima Plant

Claims (1)

(57) [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 dovetail members are slid into the dovetail grooves.
A tapered surface that makes the butting portions relatively close to each other,
Provided on the inner facing surfaces of the enlarged heads facing each other
At the same time, it is also provided in the corresponding part of both dovetail groove,
Ali member both outer portions are each back portion of the internal surface of the head, Yes formed by inclined to be separated as the front of the fitting ingress direction of the dovetail member, said dovetail member
The two dovetail corresponding portion of the groove is also a segment tunnel that is form shape is inclined to be separated as the front of the fitting direction of the dovetail member to both the outer portion.