JP3024699B2 - Tunnel liner and closing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key liner formed by connecting a plurality of divided pieces of a tunnel liner formed annularly along the circumferential direction of an excavated tunnel shaft wall and forming a tunnel support, in order. The present invention relates to a tunnel liner that is closed annularly by interposition and a method of closing the tunnel liner.

[0002]

2. Description of the Related Art A tunnel supporting material is provided in contact with an excavated tunnel pit wall to prevent collapse of the excavated surface by supporting the tunnel pit wall. Various types of support structures were selected for the tunnel support materials, depending on differences in excavation methods and conditions of excavation sites, such as H steel supports and those using shotcrete in combination with them, as well as segments used for shield method. Used.

[0003] The tunnel liner (simple segment)
It is a support material mainly used for the TBM (tunnel boring machine) method, and generally, it is considered that the segment type used for the shield method has a simpler structure. Also, in assembling the tunnel liner,
A construction method of assembling the divided pieces into a ring and forming a tunnel support is basically used.

In recent years, the rationalization of construction, mechanization,
Instead of using H steel support or shotcrete support, tunnel tunnel liner support should be used instead of H steel support or shotcrete support for reasons such as improvement of construction environment, high speed excavation, and improvement of safety aspects of construction. It is becoming.

[0005] When assembling a tunnel liner by connecting the divided pieces and closing them annularly, a piece called a key liner (hereinafter referred to as a K liner) is assembled last, and the tunnel liner is closed annularly. are doing.

Here, there are two conventional methods of the structure of the K liner to be assembled last, which are roughly classified into a "radial insertion type" and an "axial insertion type" (see FIGS. 5 to 8).

First, in the radial insertion type, FIGS.
As shown in the figure, a plurality of pieces divided along the circumferential direction of the excavated tunnel shaft wall 7 are sequentially connected in a ring shape, and the K liner 2A is inserted from the radially inner side and closed on the same vertical plane. Here, in the case of the radial insertion type, in order to prevent the K liner 2A from interfering with the end of the adjacent piece when the K liner 2A is inserted from the inside in the radial direction during assembly, a predetermined direction is set in the radial direction (normal). Is provided. That is, the K-liner 2A and the pieces 3A adjacent to the left and right sides thereof (hereinafter referred to as “B-liner”) have the joint angle α.

Next, in the axial insertion type, as shown in FIGS. 7 and 8, the K liner 2B is fed in the tunnel axial direction and closed. In this case, the K liner 2B has a wedge shape. When assembling, insert K liner
After the liner 2B is slid once toward the face in the axial direction of the tunnel, the liner 2B is assembled and closed so as to slide to the opposite side (the wellhead side) of the face. The wedge angle β in the tunnel axial direction is applied to the K liner 2B and the left and right B liners 3B.

[0009] In any of the closing methods, bolt connection is common, and in the case of an axial insertion type in which the axial force is dominant, that is, the torsion and bending force are small due to the main force in the circumferential direction of the tunnel. In some cases, an uneven (mortise) joint structure may be employed.

However, for the radial insertion type, (a) the K liner 2A falls down (downward) by the clearance between the bolt and the hole due to the joint angle α. (B) The axial force (force in the circumferential direction of the tunnel) acting on the joint surface changes into a shear force depending on the joint angle α, and the shear force acts on the bolt. Such a large shear force is not economical because it is necessary to ensure the reliability against shear fracture of the bolt, such as enlarging the bolt cross section or requiring a high-grade material. (C) The radial insertion type is basically bolted,
It is difficult to make an uneven (mortise) joint structure. Therefore, assembling workability is poor with the bolt connection. There is a problem that.

On the other hand, in the axial insertion type, (d) the joint surface of both the K liner 2B and the B liner 3B has a wedge shape in the tunnel axial direction, so that the shape of the liner is complicated and the production is troublesome. (E) For axial insertion, surface accuracy of the joint surface is required.
Manufacturing costs increase. (F) The length of the TBM becomes longer due to the sliding in the axial direction, the erector mechanism for connecting the liner becomes complicated, and the machine becomes expensive. (G) Skill is required for inserting the liner. (H) When the width of the tunnel liner is increased, the wedge shape is also increased, and the surface accuracy of the joining surface is required more, which increases the cost. (I) Although it is possible to use a bolt-less uneven (mortise) joint structure, the unevenness is liable to be damaged, and the work at the time of insertion requires skill. Various problems exist.

[0012]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and secures the workability and economy of the radial insertion type and has a boltless connection. It is still another object of the present invention to provide a method and a structure for closing a tunnel liner having a closing accuracy similar to that of an axial insertion type.

[0013]

According to the present invention, there is provided a method for closing a tunnel liner, wherein the tunnel liner which is formed annularly along the circumferential direction of the excavated tunnel pit wall and which forms a tunnel support is divided into a plurality of pieces. Are sequentially connected, and a tunnel liner is closed annularly by interposing a key liner (K liner).
Both ends of the joint surface of the liner in the tunnel axis direction and both ends of the joint surface of the piece (B liner) circumferentially adjacent to the K liner in the tunnel axis direction are defined when the tunnel liner is closed in an annular shape. The face of the protruding end provided at both ends of the adjacent piece (B liner) in the tunnel axial direction is arranged in parallel with the radial direction of the circle to be cut, and the face of the K liner in the tunnel axial direction is provided on the circumferential side face. The K liner is inserted between the B liners from the inside in the radial direction by passing through a box removing portion provided near the side end, and then the K liner is slid in the tunnel axial direction to correspond to the K liner and the B liner. The two ends of the joining surface in the tunnel axial direction are engaged with each other, and the tunnel liner is closed annularly.

Here, the phrase "radial direction of a circle defined when the tunnel liner is closed in an annular shape" is described as follows.
This will be described with reference to FIG. In FIG. 9, circles indicated by reference numerals C1 and C2 are “circles defined when the tunnel liner is closed in a ring shape”. Line segments R1 and R2 indicated by dotted lines in FIG. 9 are "radii of a circle defined when the tunnel liner is closed annularly". Reference numeral CR-I indicates a radially inner edge of the tunnel liner. The wording “radial direction of the circle defined when the tunnel liner is closed annularly” means “radius of the circle defined when the tunnel liner is closed annularly” from R1 and R2 to the radial direction of the tunnel liner. Starting from the inner edge CR-I, the circles extend in the circumferential direction of the “circles defined when the tunnel liner is closed in an annular shape” C1 and C2 by a predetermined angle indicated by reference numeral “γ” in FIG. 9. Range. However, the predetermined angle “γ”
Is determined on a case-by-case basis depending on construction conditions and the like, and there is no uniform definition. In other words, both ends (surfaces) of the joining surface of the K liner in the tunnel axis direction and both ends (surfaces) of the joining surface of the piece (B liner) circumferentially adjacent to the K liner in the tunnel axis direction. ) Are parallel to each other, and are in such a form that the K liner and the circumferentially adjacent piece (B liner) are in surface contact when engaged. When the lower edges in the radial direction of both ends (surfaces) in the tunnel axis direction of the joining surface of the K liner and the adjacent piece (B liner) are overlapped with the position CR-I shown in FIG. Both ends (surfaces) exist in a region surrounded by an arrow D1, a position CR-I, and an arrow D2 in FIG.

When the method of closing a tunnel liner of the present invention is carried out, a slide fitting joint is fixed to each of both ends in the tunnel axial direction of the joining surface of the K liner and the adjacent piece (B liner). By sliding the K liner in the axial direction of the tunnel, it is preferable that the slide fittings fit together, thereby closing the tunnel liner in a ring shape.

The tunnel liner of the present invention is formed in a ring shape along the circumferential direction of the excavated tunnel shaft wall, and constitutes a tunnel support. The tunnel liner is formed by sequentially connecting a plurality of divided pieces. In a tunnel liner that closes annularly by interposing a liner,
Both ends in the tunnel axial direction of the joint surface of the K liner;
The two ends of the joint surface of the piece (B liner) adjacent to the K liner in the tunnel axial direction are parallel to the radial direction of a circle defined when the tunnel liner is closed in an annular shape, and By sliding the K liner and the adjacent piece (B)
The K-liner is configured such that both ends in the tunnel axis direction of the corresponding joint surfaces of the K-liner are engaged with each other, and the K-liner is inserted in the vicinity of the cutting-face-side end in the tunnel axis direction of the circumferential side surface of the K liner. Occasionally, there is provided a stripped portion through which the face of the protruding end provided at both ends in the tunnel axial direction of the adjacent piece (B liner) passes.

In implementing the tunnel liner of the present invention, a slide fitting joint is fixed to each of both ends in the tunnel axial direction of the joining surface of the K liner and the circumferentially adjacent piece (B liner). It is preferable that the slide fitting joints are fitted to each other by sliding the liner with respect to the adjacent piece (B liner) in the tunnel axis direction. in this case,
The slide fitting joint includes a male joint having a wide head projecting from an end of the joint surface, and a male joint provided at a position facing the male joint and sliding in the tunnel axial direction to fit the male joint. And a female joint having a groove formed therein.

The K-liner of the tunnel liner according to the present invention is a tunnel liner which is finally interposed when the tunnel liner is closed annularly along the circumferential direction of the excavated tunnel wall to form a tunnel support. Pieces (B liner) adjacent to each other in the circumferential direction
The two ends of the joining surface in the tunnel axial direction are parallel to the radial direction of a circle defined when the tunnel liner is closed annularly, and the two ends of the joining surface in the tunnel axial direction are the K liner. By sliding in the tunnel axis direction with respect to the adjacent piece (B liner), the adjacent pieces (B liner) are configured to mutually engage with both ends in the tunnel axis direction of the joining surface. In the vicinity of the face side end in the tunnel axial direction of the side face in the direction of the tunnel, a face-cut portion through which the face face of the protruding end provided at both ends in the tunnel axial direction of the adjacent piece (B liner) passes when the K liner is inserted. Is provided. At the time of implementing the K liner of the tunnel liner of the present invention, a slide fitting joint is fixed to each of both ends in the tunnel axial direction of the joining surface with the piece (B liner) adjacent in the circumferential direction, and the slide fitting is performed. The joint slides the K liner in the tunnel axial direction with respect to the adjacent piece (B liner) to thereby fix slides fixed to both ends in the tunnel axis direction of the joining surface of the adjacent piece (B liner). It is preferable that it is configured so as to be fitted with the fitting joint. Here, the slide fitting joint is a male joint having a wide head projecting from an end of the joint surface,
It is preferable that the joint is a slide fitting joint which is provided at a position facing the male joint and which slides in the tunnel axis direction and has a female joint formed with a groove for fitting with the male joint.

Further, the piece (B liner) of the tunnel liner of the present invention can be used to form a tunnel support by annularly closing the tunnel liner along the circumferential direction of the excavated tunnel shaft wall with respect to the K liner described above. Of the tunnel liner adjacent in the circumferential direction of the tunnel (B
Liner), both ends in the tunnel axis direction of the joining surface with the K liner are parallel to the radial direction of a circle defined when the tunnel liner is closed in a ring shape, and both ends in the tunnel axis direction of the joining surface. Is configured so that the K liner is slid in the tunnel axis direction to mutually engage with both ends of the joining surface of the K liner in the tunnel axis direction, and both ends of the circumferential side surface in the tunnel axis direction. Is provided with a protruding end portion, and the face side of the end portion is configured to pass through the box removal portion of the K liner when the K liner is inserted.

In implementing the piece (B liner) of the tunnel liner of the present invention, the piece (B liner) of the tunnel liner adjacent to the above-mentioned K liner having the flange fitting joint in the circumferential direction of the tunnel. ,
A slide fitting joint is fixedly provided at each of both ends in the tunnel axis direction of the joint surface with the K liner, and the slide fitting joint is provided when the K liner slides in the tunnel axis direction. It is preferable that the liner is configured to be mutually fitted with a slide fitting joint fixed to each of both ends in the tunnel axial direction of the joining surface of the liner. Here, the slide fitting joint includes a male joint having a wide head projecting from an end of the joining surface, and a K-liner provided at a position facing the male joint and the K liner sliding in a tunnel axial direction. And a female joint formed with a groove to be fitted with the male joint.

According to the present invention configured as described above, a plurality of divided pieces are sequentially connected along the pit wall of the excavated tunnel, and from the inside between the remaining piece ends,
The cleaved portion of the K liner is inserted so that the protruding end of the opposed B liner passes therethrough.
If the K liner is slid in the tunnel axis direction, both ends of the joint surface of the K liner in the tunnel axis direction and both ends of the joint surface of the B liner in the tunnel axis direction abut and engage with each other. , The tunnel liner is closed and connected annularly.

Alternatively, in the present invention, if a slide fitting joint is fixed to each of both ends in the tunnel axial direction of the joint surface of the K liner and the adjacent piece (B liner), the joint can be divided in the same manner as described above. A plurality of pieces are sequentially connected, and from the inside between the remaining piece ends, the kerf removal portion of the K liner is inserted such that the protruding end of the opposed B liner passes therethrough. Then, when the K liner is slid in the tunnel axial direction, the slide fitting joint is fitted. As a result, the tunnel liner is closed and connected in a ring.

As described above, according to the present invention, the tunnel liner can be closed by a simple operation of inserting, aligning, and sliding the K liner. Here, the connection between the K liner and the B liner according to the present invention has the same reliability as that of the conventional axial insertion type in which the surfaces facing the center of both ends are joined together, and the sliding amount is greatly reduced. The accuracy is not particularly required.

In addition, in the present invention, the K liner and B
The liner is securely connected to the liner by abutting the surfaces at both ends of the joint surface in the tunnel axis direction or by a slide fitting joint. On the other hand, bolt
There is also an effect that the labor required for connection is extremely small as compared with the operation of connecting the nut.

In practicing the present invention, when the slide fitting joint is provided, and when the piece of the tunnel liner is of a type in which a main girder is provided on the side surface in the tunnel axial direction, the slide The fitting joint is preferably provided with a male joint and a female joint on one joint surface. If the male joint and the female joint of the slide fitting joint are provided on one joint surface, it is not necessary to form a notch in the main girder which is a structural member.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, divided pieces are sequentially connected along the left and right pit walls 7 of the excavated tunnel, and B liners 3, 3 at both ends (pieces circumferentially adjacent to the key liner). Between them, a K liner 2 is inserted to form an annular tunnel liner 1. As shown in FIG. 1, the joint surfaces of the K liner 2 and the B liner 3 are formed with vertical concrete surfaces 2a, 3a at the respective central portions, and both ends thereof, that is, a tunnel shaft. End plate surfaces 2b (both ends of the joining surface of the key liner in the tunnel axis direction) constituting both side surfaces of the main girder, and 3b (both ends of the joining surface of the pieces circumferentially adjacent to the key liner in the tunnel axis direction) ) Is formed by a surface facing the center of the tunnel liner 1 (a surface parallel to the radial direction of a circle defined when the tunnel liner is closed in an annular shape).

In other words, the end plate surfaces 2b, 3b, which are "both ends in the tunnel axial direction of the joint surface between the key liner and the circumferentially adjacent piece" are defined when the tunnel liner is closed in an annular shape. Are parallel to the radial direction of the circle (see FIG. 9).

Both ends 3b, 3b in the tunnel axial direction of the joint surface of the B liner 3 (both ends in the tunnel axial direction of the piece adjacent to the key liner) are on the inner peripheral side (radially inward:
The lower side in FIG. 1 projects toward the K liner 2, and both ends 2 b, 2 b of the joining surface of the K liner 2 in the tunnel axis direction
Are recessed on the inner peripheral side (radially inner side: lower side in FIG. 1).

In FIG. 1, at both ends 3b and 3b of the joining surface of the B liner 3 in the direction of the tunnel axis, portions protruding toward the K liner 2 (portions indicated by reference numerals "3b-P") are the same as those described above. Protruding ends provided at both ends in the tunnel axial direction of adjacent pieces. "

From the end plate surface (both ends in the direction of the tunnel axis of the joining surface) 2b on the face side (the side F in FIGS. 1 and 2) of the K liner 2, the wellhead side (the side R in FIGS. 1 and 2).
Side) is provided with a stripped portion 2c corresponding to the face F side of the end plate surface 3b (both ends of the joining surface in the tunnel axis direction) of the B liner. A plate 6 for preventing grout or the like from dropping from a gap between the joining surfaces is fixed below the flute removal portion 2c.

That is, when the K liner is inserted, the peripheral side surface of the K liner 2 is adjacent to the end on the face F side in the tunnel axial direction (inward in the axial direction of the end plate surface 2b on the face F side). Projecting ends (3b-P, 3b-) provided at both ends in the tunnel axial direction of the piece (B liner 3)
A strip removal portion 2c through which the face side (F side) of P) passes is provided. Then, the face side (F side) of the protruding ends (3b-P, 3b-P) provided at both ends in the tunnel axial direction,
By passing through a stripped portion 2c provided near the end face (F side) end of the circumferential side surface of the K liner 2 in the tunnel axis direction (inside the end plate surface 2b on the face F side in the axial direction),
The K liner 2 is inserted between the B liners 3,3.

The end plate surfaces 2b, 3b
Each have a slide fitting joint 8 (end plate surface 2b
Is provided with a joint 8B, and a joint 8A) is provided on the end plate surface 3b. Then, the slide fitting joint 8 slides the K liner 2 with respect to the B liner 3 in the tunnel axis direction, more specifically, in the tunnel axis direction toward the wellhead side (R side in FIG. 2), thereby forming the K liner 2. The slide fitting joint 8B provided on the end plate surface 3b of the B liner 3 is provided with the slide fitting joint 8B provided on the end plate surface 2b.
And are fitted to each other. The slide fitting joint 8 has a male joint 8A whose head has a wide T-shaped axial cross section and protrudes from an end plate surface, and a female joint which is a T-shaped groove fitted to the male joint 8A. 8B.

In the illustrated example, the male joint 8 is provided at the wellhead R side.
A, the female joint 8B is shown on the face F side, the female joint 8B is shown on the insertion side of the B liner 3, and the male joint 8A is shown on the side opposite to the insertion, but any combination may be used.
For example, the K liner 2 is provided with only a male joint, the B liner 3 is provided with only a female joint, the K liner 2 is provided with only a female joint, and the B liner 3 is provided with only a male joint, or Only the male joint may be provided on one of the left and right sides in FIG. 1 of the K liner 2, and only the female joint may be provided on the other side.

However, as shown in FIG. 10, the piece 3 of the tunnel liner is moved in the direction of the tunnel axis (arrow T in FIG. 10).
In the case of the type in which the main girders 3-M and 3-M are provided on the side surface of
One joint surface, that is, the joint surface of the K liner (2a and 2b: in the illustrated embodiment, both ends 2b, 2a in the tunnel axial direction)
b) and the joint surface of the B liner (3a and 3b: both ends 3b and 3b in the axial direction in the illustrated embodiment) are provided with a male joint 8A and a female joint 8B. This is because, when only the female joint 8B is provided on one joint surface, notches necessary for the female joint 8B must be formed in the main beams 2-M and 3-M, which are structural members.

Although the concrete surfaces 2a and 3a at the joint surface of the K liner and the B liner have been described as vertical surfaces, it is also possible to provide a joint angle (θ in FIG. 5) on this surface.

Accordingly, as shown in FIG. 4, pieces are sequentially connected along the tunnel wall 7 of the excavated tunnel, and the pieces are connected inward (downward) between the B liners 3, 3 at the end of the last ceiling. ), When the K liner 2 is inserted toward the face by the thickness of the main girder on the side surface, the protruding B liner end 3b can be easily inserted through the kerf removal portion 2c of the K liner 2. If the slide fitting joint 8 is positioned and slid toward the wellhead, the slide fitting joints 8A and 8B
Are fitted, the K liner 2 and the B liner 3 are connected, and the tunnel liner 1 is closed to form an annular shape.

As described above, the tunnel liner 1 is inserted by a simple operation of inserting, aligning and sliding the key liner 2.
Can be closed. The connection has the same reliability and assembly accuracy as the conventional axial insertion type in which the surfaces facing the center of both ends 2b and 3b are joined together, and the sliding amount is greatly reduced. , Work volume or T
The BM length is reduced, and the precision of the joining surface is not particularly required.
Then, while the connection is reliably made by the slide fitting joint 8, an effect is obtained that the required labor is extremely small as compared with the bolt / nut coupling operation.

In the above embodiment, the K liner and B
Both ends (2b, 2b) of the joining surface of the liner in the tunnel axial direction
b, 3b, 3b) to the slide fitting joints (8, 8
A, 8B), but without the slide fitting joint are also included in the technical scope of the present invention. That is, in the embodiment shown in FIG.
0, the male and female joints (joint members) indicated by reference numerals 8A and 8B are omitted, and both ends (2b, 2b, 3b) of the joint surface of the K liner 2 and the B liner 3 in the tunnel axial direction are omitted.
b, 3b) are formed in a flat state.

Also in the embodiment shown in FIG. 11, similarly to the case of FIG. 1 or FIG. 10, the end portions on the face F side (projecting end portions 3b-P, 3b-
P) is inserted into the K liner 2 between the B liners 3 and 3 through the box removal portion 2c. Then, if the K liner 2 is slid to the wellhead side (R side), the end portion 2b (flat surface without a slide fitting joint) on the K liner 2 side
And the end 3b on the B liner 3 side (without a slide fitting joint and flat) is engaged. Here, as clearly shown in FIG. 11 in particular, the end 3b on the B liner 3 side projects inward in the radial direction (the lower side in FIG. 11) toward the K liner 2 side. Ends 2b and 3
When b is engaged, the engaged state is not released by the weight of the K liner. Therefore, the K liner 2 and the B liner 3 are connected, and the tunnel liner 1 is closed and formed in an annular shape.

[0040]

Since the present invention is constructed as described above, the work is easy, no skill is required, and the number of working steps is extremely small as compared with bolt connection. And it has the same reliability and assembling accuracy as the conventional axial insertion type, furthermore, the sliding amount is greatly reduced, and the accuracy of the joining surface is not particularly required.

More specifically, the present invention has the following advantages as compared with a conventional radial insertion type, for example. (A) There is no need to provide the joint angle α. Therefore, the K liner is prevented from dropping inward (downward) in the radial direction by the clearance between the bolt and the hole. (B) Since there is no need to provide the joint angle α, the axial force (force in the circumferential direction of the tunnel) acting on the joint surface is reduced by the joint angle α.
This prevents a change in shear force. In addition, since fastening means such as bolts are not required, there is no need to enlarge the bolt cross section or facilitate the use of bolts made of high-grade materials, and it is not necessary to ensure the reliability against shear failure of bolts. The cost is reduced accordingly. (C) Since a fastening means such as a bolt is not required, the work associated with the bolt connection is unnecessary. In addition, since the closing operation of the tunnel liner is completed by an extremely simple operation of inserting the K liner from the inside in the radial direction and sliding in the wellhead direction, the workability is extremely good.

On the other hand, as compared with the conventional axial insertion type, the present invention has the following advantages. (D) Since the joining surface between the K liner and the B liner does not need to have a wedge shape in the tunnel axis direction, the production cost of the liner does not increase so much. (E) The surface accuracy of the joining surface is not required, and the manufacturing cost can be kept low. (F) Since the sliding amount in the axial direction is relatively small, TB
There is no need to lengthen the PIC of M. Therefore, there is no need to complicate the erector mechanism for connecting the liner, and the machine manufacturing cost does not increase. (G) Since the closing operation of the tunnel liner is completed by a very simple operation of inserting the K liner from the inside in the radial direction and sliding in the direction of the wellhead, no skill is required for inserting the liner. (H) Since a wedge-shaped liner is not required, the required surface accuracy of the joining surface does not increase even if the width of the tunnel liner is increased. (I) Since the tunnel liner can be closed without using a boltless uneven (mortise) joint structure, various inconveniences caused by the boltless uneven (mortise) joint operation can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a top view showing the K liner of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a perspective view illustrating a closing method of the present invention.

FIG. 5 is a front view showing a conventional radial insertion type.

FIG. 6 is a perspective view showing an inserted state of FIG. 5;

FIG. 7 is a front view showing a conventional axial insertion type.

FIG. 8 is a perspective view showing the inserted state of FIG. 7;

FIG. 9 is a schematic diagram for explaining “radial direction of a circle defined when the tunnel liner is closed in an annular shape”.

FIG. 10 is a perspective view showing another embodiment of the present invention different from FIG. 1 in a partially broken state.

FIG. 11 is a perspective view showing another embodiment of the present invention different from FIGS. 1 and 10 in a partially broken state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tunnel liner 2 ... K liner (key liner) 2b ... Both ends of the joining surface of K liner in the tunnel axis direction 2-M, 3-M ... Main girder 3 ... B liner (Pieces circumferentially adjacent to the key liner) 3b ... B liner (pieces circumferentially adjacent to the key liner) at both ends in the tunnel axis direction of the joining surface 3b-P ... B liner (with the key liner Projecting ends provided at both ends in the tunnel axial direction of pieces (circumferentially adjacent pieces) 6... Plate 7... Tunnel pit wall 8 A, 8 B. ..Mouth side

Continuing from the front page (72) Inventor Shigeru Kaji 2-7-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kaname Aoyama 1-8 Kandanishikicho, Chiyoda-ku, Tokyo Sumitomo Univ. Osaka Cement Co., Ltd. Tokyo Branch (72) Inventor Hiroaki Suzuki 1 Kanda Midoshiro-cho, Chiyoda-ku, Tokyo Sumitomo Osaka Cement Co., Ltd. (72) Inventor Michio Sasaki 20-1 Shintomi, Futtsu-shi, Chiba New Nippon Steel Corporation Technology Development Division (72) Inventor Noriyuki Hirosawa 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Corporation Technology Development Division (56) References JP-A-7-18986 ( JP, A) Japanese Utility Model Showa 59-76697 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (11)

(57) [Claims] 1. A tunnel liner formed in a ring shape along the circumferential direction of an excavated tunnel shaft wall and forming a tunnel support by connecting a plurality of divided pieces sequentially and interposing a key liner. In the method for closing a tunnel liner, the both ends of the joining surface of the key liner in the tunnel axis direction and both ends of the joining surface of the pieces circumferentially adjacent to the key liner in the tunnel axis direction are formed by a tunnel liner. Are formed in parallel to the radial direction of the circle defined when the ring is closed, and the face of the protruding end provided at both ends in the tunnel axial direction of the adjacent piece is connected to the tunnel of the key liner circumferential side surface. The key liner is inserted between the adjacent pieces from the radial inside by passing through a saw hole provided in the vicinity of the end face side in the axial direction, and then the key liner is inserted. Closing the tunnel liner by sliding in the tunnel axis direction to engage both ends of the key liner and the corresponding joining surfaces of the adjacent pieces in the tunnel axis direction, thereby closing the tunnel liner in an annular shape. Method. 2. A slide fitting joint is fixed to each of both ends in the tunnel axis direction of the joint surface of the key liner and the circumferentially adjacent piece, and slides the key liner in the tunnel axis direction. The method for closing a tunnel liner according to claim 1, wherein the slide fitting joints are fitted to each other to thereby close the tunnel liner in a ring shape. 3. A tunnel liner formed annularly along the circumferential direction of the excavated tunnel shaft wall and constituting a tunnel support, wherein a plurality of divided pieces are sequentially connected,
In a tunnel liner that is closed annularly by interposing a key liner, both ends in the tunnel axial direction of a joining surface of the key liner and both ends in a tunnel axial direction of a joining surface of a piece circumferentially adjacent to the key liner. The portion is parallel to the radial direction of the circle defined when the tunnel liner is closed in an annular shape, and the key liner and the adjacent piece are slid by sliding the key liner in the tunnel axial direction. Both ends in the tunnel axial direction of the surface are configured to engage with each other, and near the end face side in the tunnel axial direction of the circumferential side surface portion of the key liner, the adjacent piece of the adjacent piece when the key liner is inserted. A tunnel liner, comprising: a stripped portion through which a face of a protruding end provided at both ends in a tunnel axial direction passes. 4. A slide fitting joint is fixed to each of both ends in the tunnel axis direction of the joining surface of the key liner and the circumferentially adjacent piece, and the key liner is mounted on the tunnel shaft with respect to the adjacent piece. 4. The tunnel liner according to claim 3, wherein the slide fitting joints are fitted to each other by sliding in a direction. 5. The slide fitting joint comprises: a male joint having a wide head projecting from an end of the joint surface; and a slide joint provided at a position facing the male joint and sliding in a tunnel axial direction. The tunnel liner according to claim 4, wherein the tunnel liner is a slide fitting joint constituted by a male joint and a female joint having a groove formed therein. 6. When a tunnel liner is closed annularly along a circumferential direction of an excavated tunnel shaft wall to form a tunnel support, a key liner of a tunnel liner finally interposed is circumferentially adjacent to the key liner. Both ends in the tunnel axis direction of the joining surface with the piece to be joined are parallel to the radial direction of a circle defined when the tunnel liner is closed in a ring shape, and both ends in the tunnel axis direction of the joining surface are the key liner. Is configured to slide in the tunnel axial direction with respect to the adjacent piece to mutually engage with both ends in the tunnel axial direction of the joining surface of the adjacent piece, and the tunnel shaft in the circumferential side surface portion In the vicinity of the end face in the direction of the face, there is a box removal part through which the face side of the protruding end provided at both ends in the tunnel axial direction of the adjacent piece when the key liner is inserted passes. A key liner for a tunnel liner, which is provided. 7. A slide fitting joint is fixed to each of both ends in the tunnel axial direction of a joining surface with a circumferentially adjacent piece, and the slide fitting joint attaches the key liner to the adjacent piece. 7. A slide fitting according to claim 6, wherein the sliding pieces are slid in the tunnel axis direction to mutually fit slide fitting joints fixed to both ends of the joining surface of the adjacent pieces in the tunnel axis direction. Key liner for tunnel liner. 8. The slide fitting joint includes a male joint having a wide head projecting from an end of the joint surface, and a slide joint provided at a position facing the male joint and sliding in a tunnel axial direction. 8. The key liner of a tunnel liner according to claim 7, wherein the key liner is a slide fitting joint comprising a male joint and a female joint having a groove to be fitted. 9. The tunnel liner adjacent to the key liner of claim 6 in the circumferential direction of the tunnel liner when the tunnel liner is closed annularly along the circumferential direction of the excavated tunnel shaft wall. In the above-mentioned piece, both ends in the tunnel axial direction of the joining surface with the key liner are parallel to the radial direction of a circle defined when the tunnel liner is closed in a ring shape, and both ends in the tunnel axial direction of the joining surface. Is configured so that the key liner is slid in the tunnel axial direction to mutually engage with both ends of the joining surface of the key liner in the tunnel axial direction, and both ends of the circumferential side surface in the tunnel axial direction. Has a protruding end portion, and the face side of the end portion is configured to pass through the box removal portion of the key liner when the key liner is inserted. Tunnel liner piece. 10. A piece of a tunnel liner which is adjacent to the key liner in the circumferential direction of the tunnel, and is slidably fitted to each of both ends in the tunnel axial direction of a joint surface with the key liner. The joint is fixed,
When the key liner is slid in the tunnel axial direction, the slide fitting joint mutually engages with a slide fitting joint fixed to each of both ends in the tunnel axis direction of the joining surface of the key liner. 10. The configuration according to claim 9, wherein
Piece of tunnel liner. 11. The slide fitting joint comprises: a male joint having a wide head protruding from an end of the joining surface; and a key joint provided at a position facing the male joint, wherein the key liner is disposed in a tunnel axial direction. 11. The piece of the tunnel liner according to claim 10, wherein the female fitting has a groove formed to fit with the male fitting when sliding.