JPH0813990A - Shield tunnel lining method - Google Patents

Abstract

PURPOSE:To provide a shield tunnel lining method capable of smoothly conveying and assembling segments, reducing the tunnel excavation cross section, and forming a segment ring having a stable and static structure. CONSTITUTION:Flange sections 14a, 14b of two rectangular segments 9a, 9b are temporarily connected with a connecting tool 15, and the end face 20a of the first rectangular segment 9c is butted to one end face 19a. The segment 9c is rotated around the outer end edge 24a of the end face 20a serving as the center axis, and the outer end edge 24b of the remaining end face 20b is moved near to the inner peripheral face of a skin plate 16 and temporarily fitted. The end face 21a of the second rectangular segment 9d is butted to the other end face 19b, the segment 9d is rotated, and the outer end edge of the remaining end face 21b is moved near to the inner peripheral face of the skin plate 16. The remaining end faces 20b, 21b of the rectangular segments 9c, 9d are closed together to form a segment ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to four or more n rectangular segments (hereinafter referred to as "isosized rectangular segments") having substantially the same chord length in the tail portion of the shield, preferably the inner surface. The present invention relates to a shield tunnel lining method of assembling smooth isometric rectangular segments in a plane orthogonal to the tunnel axis to form a segment ring. The "rectangular segment" referred to here means a rectangular shape in which the outer peripheral surface of the segment is projected on a plane as viewed from the inner peripheral surface side, and "a rectangular segment having substantially the same chord length" Means a rectangular segment having substantially the same chord length between the both edges of the outer peripheral surface of the segment regardless of whether or not it has a flange on its end surface.

[0002]

2. Description of the Related Art When a segment ring is formed at the tail of a shield, the segment ring has a stable and static structure, and it is easy to carry the segment in a tunnel or assemble it at the tail. It is at least necessary to satisfy the above condition, and it is desirable that the segments are compatible with each other in terms of manufacturing and assembling operations, so that the chord lengths are often equal.

In order to make the segment ring a stable and static structure, it is generally a three-hinge ring structure, specifically, three equal-sized segments known as the lining of the mini shield construction method. A ring may be formed. However, when forming a segment ring with three equal-sized segments, the chord length of each segment becomes relatively large with respect to the tunnel inner diameter, so it is necessary to devise transportation of the segment in the tunnel. Even when assembling the segment ring at the tail part of the, it is not possible to take steps like the general shield construction method, and a special method is required.Furthermore, in this assembly, the tail clearance with the skin plate is large. There was a problem that the excavated cross section of the tunnel was large because it had to be done.

In order to facilitate the transportation of the segments in the tunnel and the assembling at the tail portion, it is preferable to increase the number of segments constituting the one-segment ring so that the chord length of each segment is as short as possible. Therefore, it is possible to solve the problem by forming the segment ring with n equal-sized segments of 4 or more. However, the n-hinge ring structure formed by hinge-bonding four or more n-segments is unstable and generally cannot be used as a tunnel lining. Note that the n hinge ring structure here means n
When forming a segment ring with individual segments,
This means a structure in which adjacent segments form a hinge connection, that is, a structure in which end portions abut each other can rotate about this as a central axis.

Regarding the shape of the segment,
Trapezoidal segments with a trapezoidal shape and hexagonal hexagonal segments that are projected on a plane when the outer peripheral surface of the segment is viewed from the inner peripheral surface side are inserted in the tunnel axis direction because the end surface of the segment is inclined. The segment ring can be formed by legislation. As a result, the tail clearance can be reduced, and the inclined end faces of the segments are advantageous for transmitting the bending moment of the ring, and have the advantage of stabilizing the structure of the segment ring. On the other hand, the slanted end face of the segment also increases the chord length and complicates the structure.Therefore, the rectangular segment is advantageous in consideration of the convenience in manufacturing and transporting the segment, and the ease of assembly. Is.

[0006]

However, four or more n's are to be solved.
When the segment ring is formed by individual equal-sized rectangular segments, the problems of the segment transportation and the tunnel excavation cross section described above are solved, but there is a defect that the structure of the segment ring becomes unstable.

Therefore, an object of the present invention is to form a 1-segment ring by four or more n equal-sized rectangular segments so that the segments can be transported and assembled smoothly. The purpose is to obtain a shield tunnel lining method capable of converting the unstable structure, which was a defect in this segment ring, into a stable and static three-hinge ring structure.

[0008]

In order to achieve the above object, the shield tunnel lining method according to the present invention is arranged such that four or more rectangular segments having substantially equal chord lengths are provided along the tunnel axis in the tail portion of the shield. For forming a segment ring in a plane orthogonal to the first and second rectangular segments, the opposite ends of the (n-2) remaining rectangular segments are temporarily joined by a connector. Temporarily form an integral invert segment unit by joining, abutting the end face of the first rectangular segment corresponding to one end face of the invert segment unit, and centering this first rectangular segment on the outer edge of the end face Rotate around it as an axis to bring the outer edge of the remaining end face close to the inner peripheral surface of the skin plate for temporary fixing, and then to the invert segment unit. The end face of the second rectangular segment is abutted against the other end face, and this second rectangular segment is rotated around the abutting portion of the end face as a central axis to rotate the outer edge of the remaining end face to the inner circumference of the skin plate. The inversion segment unit, the first rectangular segment, and the second rectangular segment, which are substantially close to each other, and are then closed so that the remaining end faces of the first and second rectangular segments are aligned with each other. To form a segment ring having a 3-hinge ring structure.

In order to realize the three-hinge ring structure most reasonably, it is more preferable that the one-segment ring is formed by four equal-sized rectangular segments, that is, the invert segment unit is formed by two rectangular segments. preferable. At that time, it is necessary to transmit the bending moment at each joint, and in order to reduce the segment thickness and effectively achieve this, it is sufficient to increase the segment thickness of the joint. It is preferable that flanges are provided at opposite ends of the segment, and these ends are temporarily joined by tightening the flanges from the outside with a joining tool. Furthermore, in order to rigidly join and integrate the temporarily formed invert segment unit, after the backfilling is injected and the ground is stabilized, the temporarily joined invert segment unit is released from the temporary joint, and the reinforcement is performed based on the design. After that, concrete may be poured until at least the part that was temporarily joined is buried.

[0010]

According to the present invention, the remaining rectangular segments excluding the first and second rectangular segments are temporarily joined using a joining tool to temporarily form the invert segment unit, so that a stable and static three hinge is provided. A ring structure can be obtained. In addition, the flange portions provided at the opposite ends of the remaining rectangular segments are temporarily joined by tightening with a joining tool from the outside, so that a temporarily integrated invert segment unit is obtained. Then, by pouring concrete until the flange portion is buried, a strong structure is obtained. Furthermore, when the invert segment unit is formed of two rectangular segments, the temporary joining is easy because the temporary joining portion is only one place.
It is also advantageous for forming a strong structure thereafter.

After the invert segment unit is temporarily formed, backfilling is injected to stabilize the ground, the temporary joint is released, and after the reinforcement is arranged based on the design, the temporarily joined portion is buried. The invert segment unit can be integrated by rigid joining by pouring concrete up to. Further, since the inner surface of the segment ring can be made smooth without exposing metal parts, secondary lining can be omitted, and the construction period can be shortened, which is economical.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the shield tunnel lining method according to the present invention will be described with reference to the drawings. FIG.
In (a), a space 5 is provided for assembling a new segment between the shield jack 3 located in the ring girder portion 2 of the shield machine 1 and the segment ring 4 which has already been assembled into a potato joint. It is the figure which showed the tail part 6 of the state, and FIG.1 (b) shows the segment ring 4 which was already assembled and was made into the potato joint shown in the same figure (a).
It is the figure which looked at in the excavation direction 8 from the tunnel mouth. In addition, the potato joint is a joint position 7a between the segment end faces,
This is when the segment rings are connected along the excavation direction 8 so that the segment rings 4a and 4b coincide with each other. In addition, segment rings 4a and 4b
It is also possible to assemble the segment ring by a zigzag set in which the joining positions 7a and 7b are displaced from each other.

The segment ring 4 shown in these figures is
It is composed of four equal-sized rectangular segments 9a, 9b, 9c, 9d, that is, the invert segment unit 1
Two rectangular segments 9b, 9a having the shape shown in FIGS. 2 (b) and 2 (c) forming 0, and FIG.
First and second rectangular segments 9 having the shape shown in FIG.
c and 9d. Further, these rectangular segments 9a to 9d are provided with tenon 11 on one side and tenon groove 12 on the other side on both side surfaces orthogonal to their tunnel axes, that is, ring joint surfaces. In the case of potato joints, the 11 and the mortise groove 12 are used for positioning and waterproofing, not for the purpose of improving rigidity by splicing between the segment rings, and are rectangular if the tenon is not provided. Since the segments 9a and 9b can be made compatible with each other, whether or not to provide them is appropriately selected. It should be noted that the two rectangular segments 9c and 9d located on the upper side are compatible with each other regardless of the presence or absence of the tenon, and therefore either one may be used.
In addition, if you want to have a splicing effect with a tenon between the rings, use staggered sets. Further, in this embodiment, these rectangular segments 9a, 9b, 9
Grout holes 30 for backfilling injection into c and 9d
This shows the case where the grout hole 30 is provided.
Can also be used when assembling the ring.

The two rectangular segments 9a and 9b forming the invert segment unit 10 are provided with flanges 14a and 14b projecting toward the inner surface 13 of the segment at their one ends, respectively. And the flange parts 14a and 14b from the outside with the joining tool 15
By using the above and tightening and temporarily joining, the semi-circular arch-shaped invert segment unit 10 integrally joined is temporarily formed. In addition, when one segment ring is composed of five or more rectangular segments, that is,
When the invert segment unit is composed of three or more rectangular segments, the structure is likely to become unstable. Therefore, of the segments constituting the invert segment unit 10, the end surface 1 of the invert segment unit is
As shown in FIG. 2 (d), the segments without 9a and 19b have flange portions 14c and 1 at both ends of the segment.
It is desirable to use a segment 9e having 4d,
Further, when the flange portions 14a to 14d are connected more firmly, respectively, the flange portions 14a to 1
4d is provided with a plurality of through holes 31, and these through holes 31
It is good to bolt it through.

In this embodiment, the joining tool 15 has a simple structure, because only a positive bending moment acts on the temporary joining portion due to the relationship between the structure and the load. Other joints such as bolt joints may also be used for the rail joint, and if the snap vise attached to the temporary joint is connected to the transportation track, it will be convenient for mounting the track, It is also advantageous for removing Toshiko Vise. In order to reliably transmit and integrate the bending moment at the temporary joining portion, the segment thickness of the flange portion may be made larger than the other portions.

Next, the process for forming the segment ring at the tail portion will be described with reference to FIGS. 3A to 3C for the case of n = 4 (n means the number of rectangular segments forming one segment ring). This will be described with reference to (d). First, as shown in FIG. 3 (a), the skin plate 1 of the shield is provided on both ends of the rectangular segment 9b with the flange portion.
By providing the wedges 17a and 17b between them and adjusting the wedges 17a and 17b, the joint end face 18b of the rectangular segment 9b is held in the vertical plane including the shield axis and becomes a segment ring. The rectangular segment 9b is arranged so as to be concentric with the inner circumference of the skin plate 16 when the skin plate 16 is opened. When n = 5,
Segment 9e having flanges 14c and 14d at both ends
The segment 9e is set so that a virtual central cutting plane that divides the segment 9e into two equal parts on a plane orthogonal to the outer peripheral line coincides with a vertical plane including the axis of the shield.

Next, with respect to the joining end surface 18b of the rectangular segment 9b, another rectangular segment 9 with a flange portion is attached.
The joint end surface 18a of a is arranged to face each other, and then the flange portions 14a and 14b are tightened with a cramping vise using the jointing tool 15 to provisionally join them to temporarily form the invert segment unit 10 (FIG. 3 (b). )).

Then, the first rectangular segment 9c is attached to an erector (not shown), and by driving this erector, the first rectangular segment 9c is placed on one end face 19a of the invert segment unit 10, and The outer end edge 24a of the end surface 20a of the first rectangular segment 9c that abuts the end surface 19a is taken as a central axis, and the outer end edge 24b of the remaining end surface 20b approaches the inner peripheral surface of the skin plate 16. The first rectangular segment 9c is rotated. At that time, the support arm 28b ₁ of the first auxiliary jack 23a attached to the spreader of the shield jack is arranged so as to support the inner peripheral surface of the first rectangular segment 9c, and the erector is moved from the first rectangular segment 9c. After removing, this auxiliary jack 23a
To gradually push up the inner peripheral surface of the rectangular segment 9c, and stop the operation at a position close to the inner peripheral surface of the skin plate 16 to generate the first rectangular segment 9c.
Is temporarily fixed while being supported by the support arm 28b ₁ and the inner peripheral surface of the skin plate 16 (FIG. 3C). In addition,
The reason why the first rectangular segment 9c can rotate without shifting with the outer edge 24a as the central axis is that the wedge 17a is arranged between the outer edge 24a and the skin plate 16.

Then, as shown in FIG. 3 (d), the second rectangular segment 9d is placed on the other end surface 19b of the invert segment unit 10 using an erector, and the erector is attached to the above-mentioned first rectangular segment 9c. By driving in the same manner as in the case, the outer end edge of the remaining end surface 21b of the second rectangular segment 9d becomes the skin plate 1
This rectangular segment 9d is rotated until it approaches the inner peripheral surface of 6, and at that time, the support arm 28b of the second auxiliary jack 23b attached to the spreader of the shield jack.
₂ is arranged so as to support the inner peripheral surface of the second rectangular segment 9d, and the auxiliary jack 23b is operated to gradually push up the inner peripheral surface of the rectangular segment 9d.
The operation is stopped at a position close to the inner peripheral surface of the skin plate 16 so that the second rectangular segment 9d is supported by the support arm 2
8b ₂ and the inner peripheral surface of the skin plate 16 are temporarily fixed, and then the end surface 21a of the second rectangular segment 9d is fixed to the end surface 19 of the invert segment unit 10.
The rectifier is moved inward in the radial direction to a regular position on b, and the rectifier is removed from the second rectangular segment 9d.

Then, the first and second auxiliary jacks 23
The support arms 28b ₁ and 28b ₂ of a and 23b are gradually lowered, and the remaining end surfaces 20b and 21b of the first and second rectangular segments 9c and 9d are closed so that they are aligned with each other, and The segment ring shown in (b) is formed. In this embodiment, the second rectangular segment 9
d is rotated around the inner end edge 25 that abuts the other end surface 19b of the invert segment unit 10 as the central axis line. This is an example in the case where the allowable tail clearance is small, and the tail clearance is sufficient. If it is large, the outer edge may be rotated as in the case of the first rectangular segment 9c described above. The first and second auxiliary jacks 23a and 23b will be described later.

Further, after the segment ring 4 is formed by the above-mentioned process, after the backfilling is injected to stabilize the ground, the temporary joining of the invert segment unit 10 is released, and a bar arrangement or the like is formed at this temporary joining portion. After applying it appropriately, concrete is poured until at least the joint is buried, thereby forming the rigidly joined and integrated invert segment unit. An example thereof is shown in FIGS.

First, the temporary joining by means of the vise vise 15 as shown in FIG. 4 (a) is released after backfilling is injected and the ground is stabilized. At this time, in order to ensure the transmission of the bending moment of the temporary joint portion, as shown in FIG. 4B, a plurality of reinforcing bars 26 were bridged between the flange portions 14a and 14b. May be provided according to the design conditions. Thereafter, as shown in FIG. 4 (c), concrete 27 is placed on the temporary joint portion.
7 may be such that the joints such as the flanges 14a and 14b are completely buried. Moreover, in order to make the structure advantageous for bearing the bending moment by splicing between the segment rings, the positional relationship of the joints of the continuous segment rings is alternated by a certain angle across the vertical position as shown in FIG. You may arrange in staggered staggered groups. However, in this case, the amount of concrete in which the flange portion is completely buried becomes slightly larger than that in the case of FIG. 4A, which is
Since it is not preferable in terms of securing a space in the tunnel and the material cost of concrete, it is necessary to appropriately select according to the conditions.

Next, the first and second auxiliary jacks will be described with reference to FIGS. Figure 6 (a)
FIG. 6 is a view of the shield jack 3 and the spreader 22 with an auxiliary jack attached to the shield jack 3 as seen from the tunnel excavation position toward the wellhead, and FIG.
[FIG. 3] is a view of FIG. 3A viewed from directly above. Note that FIG.
In (b), for convenience of description, the first auxiliary jack 23a.
Support arm 28b ₁ of the storage position, i.e. in a position not visible in this view because it is in vertical position, also the supporting arm 28b ₂ of the second auxiliary jacks 23b are positioned to support the segments, i.e. in a horizontal position It is shown in a certain state.

The spreader 22 is a member 27 which is divided into four equal parts.
a, 27b, 27c, 27d, and the first and second auxiliary jacks 23a, 23b are attached to the two members 27a, 27b of the spreader. These auxiliary jacks 23a or 23b are L-shaped arm 28
a, the support arm 28b ₁ or 28b _2, and the drive unit 28c
Further, the spreader 22 is provided with a constricted portion 29, and the L-shaped arm 28a of the auxiliary jack is arranged corresponding to the constricted portion 29, and the support arm 28b ₁
Alternatively, 28b ₂ is rotatably attached to the L-shaped arm 28a (FIGS. 7 and 8). Furthermore, L-shaped arm 2
8a can be moved in and out in the radial direction of the shield by the drive part 28c, whereby the support arm 28b can be moved.
₁ or 28b ₂ can move in and out in the radial direction (FIG. 9). The range in which the support arm 28b ₁ or 28b ₂ can rotate is, as shown in FIG.
From the vertical position stored in the constricted portion 29 of a or 27b to the horizontal position when pushing up the rectangular segment, and the first and second rectangular segments 9c and 9d are rotated on the invert segment unit 10 by the erector. In this case, the support arm is housed in the vertical position so as not to get in the way, and after this turning operation is completed,
The support arm is arranged at the horizontal position so as to support the inner peripheral surfaces of the segments 9c and 9d. Figure 9
Shows a state in which the support arm of the auxiliary jack is rotated to a horizontal position to support the segment.

The above description is merely an example of the present invention, and various modifications can be made within the scope of the claims.

[0026]

According to the present invention, the transportation and assembly of the segments can be carried out smoothly, the tunnel excavation cross section can be made small, and the segment ring can have a stable and static structure. Since the inner surface of the segment ring can be made smooth without exposing metal parts, secondary lining can be omitted, and the construction period can be shortened, which is economical.

Further, the invert segment unit can be integrated by temporarily joining the flange portions provided at the opposite ends of the remaining rectangular segments by tightening with a joining tool from the outside, and the invert segment unit can be integrated, which is stable from the time of construction. The static segment ring can be formed, and the provision of the flange portion is advantageous because the invert segment unit after concrete pouring is more securely rigidly joined.

Further, in the case of n = 4, the invert segment unit may be formed by two rectangular segments so that the bending moment can be transmitted at one temporary joint portion, so that the structure is It can be simplified and is advantageous in terms of workability.

After the invert segment unit is temporarily formed, backfilling is performed to stabilize the ground, the temporary joint is released, and after the reinforcement is arranged as necessary, the temporarily joined portion is buried. By injecting concrete up to, the invert segment unit is rigidly joined and integrated. Moreover, since this concrete can be poured only by burying the part that was temporarily joined, a space in the tunnel can be secured, and the inner surface of the segment ring has the first and second rectangular segments. Since the joining is simply due to the abutting of the end faces having no flange portion, it is possible to make the metal fittings smooth without exposing the metal fittings without secondary lining.

[Brief description of drawings]

FIG. 1 (a) is a space for assembling a new segment between a shield jack located in a ring girder portion of a shield machine and an n = 4 segment ring which is already assembled into a potato joint. It is a figure which showed the tail part in the state in which was provided, (b) is the figure which looked at the segment ring from the wellhead of a tunnel in the excavation direction.

2A to 2C show a segment ring with n = 4.
In the case of the rectangular segment of
It is a perspective view showing the first and second rectangular segments,
(B), (c) is a perspective view showing a rectangular segment forming an invert segment unit,
(D) is a perspective view showing a rectangular segment having both flange portions forming an invert segment unit in the case of n = 5.

3 (a) to 3 (d) are views for explaining a series of steps in forming a segment ring at a tail portion when n = 4.

4 (a) to (c) are diagrams for explaining a case where the invert segment unit is rigidly joined and integrated in the case of n = 4.

FIG. 5 is a diagram when the temporary joining portions of the invert segment unit are assembled in a zigzag pattern alternately between the segment rings in the case of n = 4.

FIG. 6 (a) is a view of a shield jack and a spreader with an auxiliary jack attached to the shield jack as seen from the tunnel digging position toward the wellhead;
(B) is the figure which looked at the same figure (a) from right above.

FIG. 7 is a view showing a state in which an auxiliary jack is attached to a hollow portion of the spreader and a support arm of the auxiliary jack is rotated to a horizontal position.

FIG. 8 is a view after disassembling the spreader and the auxiliary jack,
(A) is a main part of a spreader having a recess, (b)
FIG. 6 is a diagram showing an L-shaped arm and a support arm of an auxiliary jack.

FIG. 9 is a view partially showing a state where the auxiliary jack pushes up the segment.

[Explanation of symbols]

1 Shield excavator 2 Ring girder part 3 Shield jack 4 Segment ring 5 Space 6 Tail part 7a, 7b Joint position between segment end faces 8 Tunnel excavation direction 9a, 9b, 9c, 9d, 9e Rectangular segment 10 Invert segment unit 11 Mortise 12 Mortise 13 Inner surface of segment 14a, 14b, 14c, 14d Flange 15 Connector 16 Skin plate 17a, 17b, 17c Wedge 18a, 18b Joint end face 19a, 19b Invert segment unit end face 20a, 20b First rectangular segment End face 21a, 21b End face of the second rectangular segment 22 Shield jack spreader 23a, 23b Auxiliary jack 24a, 24b Outer edge 25 Inner edge 26 Reinforcing bar 27a, 27b, 27c, 27d Spreader member 28a L-shaped arm 28b ₁ , 28b ₂ Support arm 28c Drive part 29 Constriction part 30 Grout hole 31 Through hole

Claims (4)

[Claims] 1. A shield tunnel lining method for forming a segment ring by assembling four or more n rectangular segments having substantially the same chord length in a plane orthogonal to the tunnel axis in a tail portion of the shield. , (N-2) remaining rectangular segments excluding the first and second rectangular segments are temporarily joined by a joining tool to temporarily form an integral invert segment unit, and one of the invert segment units is The end faces of the first rectangular segment are abutted against each other, and the first rectangular segment is rotated around the outer end edge of the end face as a central axis to rotate the outer end edges of the remaining end faces to the skin plate. Temporarily fix it close to the inner peripheral surface, then make the other end surface of the invert segment unit abut the end surface of the second rectangular segment, and The two rectangular segments are rotated around the abutting portion of the end face as a central axis to bring the outer edge of the remaining end face close to the inner peripheral surface of the skin plate, and then the first and second rectangular segments A shield characterized by forming a segment ring of a substantially three-hinge ring structure composed of an invert segment unit, a first rectangular segment, and a second rectangular segment by closing the remaining end faces so as to coincide with each other. Tunnel lining method. 2. The method according to claim 1, wherein flange portions are provided at opposite ends of the remaining rectangular segments, and the temporary joining of these ends is performed by tightening the flange portions from outside with a fitting. Shield tunnel lining method. 3. The shield tunnel lining method according to claim 1, wherein the invert segment unit is formed of two rectangular segments. 4. After the invert segment unit is temporarily formed, backfilling is performed to release the temporary joint after the ground is stabilized, and concrete is poured until at least the temporarily joined portion is buried. The shield tunnel lining method according to claim 1, 2 or 3, wherein the invert segment unit is rigidly joined to form an integrated invert segment unit.