JP2001132392A - Installation structure of segment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize deviation of the position of each segment structure from an original position to be installed when adjacently installing a plurality of segment structures parallel to each other in a natural ground. SOLUTION: This installation structure of the segment structures is composed such that a plurality of cylindrical segment structures 10A, 10B formed by joining a plurality of segments together circumferentially and axially are adjacently installed in parallel to each other in a natural ground 6. At least, one segment structure 10A out of the mutually adjoining segment structures 10A, 10B is constituted of a segment 2 with a bag, with the bag positioned in a portion of the segment in a part opposed to the other segment structure 10B. In a state of the bag 2a inside filled with filler, the segment 2 with the bag abuts on the outer circumferential face of the adjoining segment structure 10B so that the interval between the adjoining segment structures 10A, 10B can be fixedly held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an installation of a segment structure in which a plurality of cylindrical segment structures formed by joining a plurality of segments in a circumferential direction and an axial direction are installed in close proximity in parallel. Regarding the structure.

[0002]

2. Description of the Related Art Conventionally, as a construction method capable of constructing a plurality of tunnels in close proximity to each other in parallel, for example, H & V (Ho
rizontal variation & Vertical variation) The shield method is known. In this H & V shield method, the underground is excavated by a shield excavator that connects a plurality of shield machines made of cylindrical steel shells in parallel.
Assemble a substantially cylindrical segment structure at the rear of each shield machine, and apply a backing material such as mortar to the gap formed between the segment structure and the ground or the gap formed between each segment structure. Inject and build multiple tunnels simultaneously.

[0003]

However, in the above-mentioned method, although the backing material is filled in the space formed between the adjacent segment structures, it takes time for the filled backing material to harden. Therefore, for example, in the case where the segment structures are installed on the ground side by side vertically, the position of the upper segment structure is lowered until the backing material filled in the gap hardens. There is a possibility that the position of the segment structure below may shift in the direction of the segment structure, or the position of the lower segment structure may shift in the direction of the upper segment structure. When the displacement of the segment structures is large, for example, there is a concern that the segment structures come into contact with each other and the contact portion is damaged.

In the above construction method, the underground is excavated by a shield excavating device in which a plurality of shield machines are connected in parallel. In particular, in a sharply curved portion where the direction of excavation of the shield excavation device changes abruptly, the overhang tends to be further increased. For this reason, there is a possibility that the position of each segment structure in the sharply curved portion may be shifted in the vertical direction or the horizontal direction with respect to the ground before the backing material filled in the overhang hardens. .

An object of the present invention is to minimize the position of each segment structure from the position where it should be installed when a plurality of segment structures are installed close to each other in parallel. To get rid of it.

[0006]

According to a first aspect of the present invention, a plurality of segments are joined in a circumferential direction and an axial direction, as shown in FIGS. 1 and 2, for example. Cylindrical segment structure (10A, 10B)
Are the installation structures of the segment structures installed in the ground (6) in a plurality of parallel proximity, and at least one of the segment structures adjacent to each other is at least one of the other segment structures (10A). A part of the segment at a portion facing the segment structure (10B) is constituted by a segment with a bag (2), and the segment with a bag is adjacent to the bag (2a) in a state where the backing material is filled in the bag (2a). By contacting the outer peripheral surface of the segment structure (10B) that
0A, 10B) is kept constant.

According to the first aspect of the present invention, the backing material is filled in the bag of the segment with the bag, so that the segment with the bag comes into contact with the outer peripheral surface of the adjacent segment structure to be adjacent thereto. The distance between the segment structures is kept constant. Therefore, it is possible to minimize the displacement of the relative positions of the plurality of segment structures. Further, it is possible to prevent the segment structures from being damaged due to the contact between adjacent segment structures.

Here, the segment includes, for example, a reinforced concrete segment (RC segment), a steel segment, a ductile cast iron segment and the like. In addition, for example, the segment may have any shape such as a box-shaped segment and a flat plate-shaped segment. The segment structure includes a general segment structure having a substantially cylindrical shape, and also includes a segment structure having a polygonal (for example, square or hexagonal) cross-sectional shape of a side wall. The segment with a bag is a segment in which a bag (shielding bag) is attached to the outer peripheral surface of the segment. By injecting the backing material into the bag from the injection hole on the inner peripheral surface of the segment, the bag can be expanded to fill, for example, a void formed on the outer peripheral side of the segment.

According to a second aspect of the present invention, in the installation structure of the segment structure according to the first aspect, the plurality of segment structures are installed on the ground with at least a part of each being vertically arranged. Configuration.

According to the second aspect of the present invention, when at least a part of the plurality of segment structures are installed on the ground in a line up and down, the interval between adjacent segment structures is kept constant. The Rukoto. Therefore, the position of the upper segment structure is prevented from shifting in the direction of the lower segment structure as much as possible until the backing material filled in the gap between the segment structures hardens. Can be. Therefore, it is possible to minimize the displacement of the position of each segment structure from the position where it should be installed.

According to a third aspect of the present invention, as shown in FIGS. 4 and 5, for example, a cylindrical segment structure (10A, 1A) formed by joining a plurality of segments in a circumferential direction and an axial direction.
0B) is an installation structure of a plurality of segment structures installed in the ground (6) in parallel and close to each other, wherein the plurality of segment structures have a sharp curve in which the direction of excavation of the shield excavation device changes abruptly. At least a part of a segment having a portion (9) and arranged in the sharply curved portion is constituted by a bagged segment (2), and the bagged segment has a backing material in the bag (2a). In the filled state, by contacting the outer peripheral surface of the adjacent segment structure and the ground, the distance between the adjacent segment structures and the distance between the segment structure and the ground are kept constant. Configuration.

According to the third aspect of the present invention, the backing material is filled in the bag of the segment with the bag, so that the segment with the bag comes into contact with the outer peripheral surface of the adjacent segment structure and the ground. Thus, the distance between adjacent segment structures and the distance between the segment structures and the ground are kept constant. Therefore, in the sharply curved portion where the overhang is likely to be large, a plurality of segments are required until the backing material filled in the gap between the segment structures or the gap between the segment structure and the ground hardens. The displacement of the relative position of the structures can be minimized, and the position of the segment structures can be prevented from shifting in the vertical direction or the horizontal direction (curving direction) with respect to the ground as much as possible. Can be. Therefore, in the sharply curved portion, it is possible to prevent the position of each segment structure from being shifted from the position where it should be installed as much as possible.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

[First Embodiment] FIG. 1 is a side view showing the installation structure of a segment structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a front view showing an example of a segment with a bag.

In this embodiment, as shown in FIGS. 1 and 2, two segment structures 10A and 10B are installed on the ground 6 in close proximity to each other in the vertical direction. Each of the segment structures 10A and 10B is a substantially cylindrical structure formed by joining a plurality of segments in a circumferential direction and an axial direction, and the upper segment structure 10A is opposed to the lower segment structure 10B. A part of the segment is constituted by the segment 2 with a bag. That is, the segment structure 10A includes, in the axial direction, a segment ring 12 in which only one segment at the lower end facing the segment structure 10B is formed of the segment 2 with a bag, and a segment ring 11 formed of only the normal segment 1. It is connected alternately.

The bag-equipped segment 2 has a bag (shielding bag) 2a attached to the outer peripheral surface of the segment. When the bag 2a is folded and stored inside, as shown in FIG. 3 (a). In addition, it has almost the same shape as the general segment 1 and can be handled in the same manner as the general segment 1. On the other hand, when the backing material is injected into the bag 2a from the injection hole on the inner peripheral surface of the segment, the bag 2a expands toward the outer peripheral side of the segment as shown in FIG. The size (radial length) of the bag 2a in the inflated state depends on the gap 5b formed between the segment structures 10A and 10B and the segment structures 10A and 1B.
It has a size corresponding to the gap 5a formed between 0B and the ground 6.

As shown in FIGS. 1 and 2, the bag-equipped segment 2 comes into contact with the outer peripheral surface of the segment structure 10B when the bag 2a is filled with a backing material. That is, the bag-attached segment 2 is formed by the bag 2a filled with the backing material interposed in the space 5b between the segment structures 10A and 10B.
The interval between A and 10B is kept constant. As shown in FIGS. 1 and 2, a gap 5 a formed between the segment structures 10 A and 10 B and the ground 6.
In addition, a backing material 4 such as mortar is filled in a gap 5b (a part except the bag 2a of the bag-equipped segment 2) formed between the segment structures 10A and 10B.

Next, the segment structures 10A, 10A
The method of installing B will be described.

The shield tunnel having the segment structures 10A and 10B is constructed by a shield excavating device (not shown) in which two shield machines made of a cylindrical steel shell are connected in parallel. That is, the excavation hole 3 having the cross section shown in FIG. 2 is excavated by the shield excavating device, and at the same time, the segment structures 10A and 10B are assembled at the rear portions of the two shield machines.

In assembling the segment structures 10A and 10B, a plurality of segments (normal segments 1,..., Segments 2 with a bag) are joined in the circumferential direction to first assemble annular segment rings 11, 12. This is achieved by connecting the segment rings 11 and 12 in the axial direction. At that time, the segment 2 with a bag is arranged at the above-mentioned predetermined position. Then, after the segment ring 12 having the segment 2 with the bag is assembled, the backing material is injected into the bag 2a of the segment 2 with the bag, and then, between the segment structures 10A and 10B and the ground 6. 5a and segment structures 10A, 10A formed in
B (a bag 2 of the segment 2 with a bag)
The backing material 4 is injected into the portion excluding a). 1 and 2 by filling the backing material into the bagged segments 2,.
As shown in FIG. 7, the bag 2a of the bag-attached segment 2,... Thereby, the segment structures 10A, 10B
The spacing between them is kept constant, and the downward displacement of the segment structure 10A is prevented.

In this manner, the operations of assembling the segment, injecting the backing material into the bag-attached segment 2, and injecting the backing material 4 into the gaps 5a and 5b are sequentially performed. These operations are repeated. , Segment structure 10A, 1
OB will be installed at the ground 6.

As described above, according to the installation structure of the segment structure of the first embodiment, the segment 2
By filling the backing material in the bag 2a, the bag-attached segment 2 comes into contact with the outer peripheral surface of the segment structure 10B, and the interval between the segment structures 10A and 10B is kept constant. . Therefore, the segment structure 10
A, before the backing material 4 filled in the gap 5b between A and 10B is hardened, the position of the upper segment structure 10A is shifted in the direction of the lower segment structure 10B as much as possible. Can be eliminated. Therefore, it is possible to minimize the displacement of the position of each of the segment structures 10A and 10B from the position where it should be originally installed.

In this embodiment, a part of the upper segment structure 10A is constituted by the segment 2 with a bag.
It is also possible to constitute a part of the bag 2 with the segment 2 with a bag. That is, the segment 2 with a bag constituting the segment structure 10B is brought into contact with the outer peripheral surface of the segment structure 10A, thereby forming the segment structures 10A, 10B.
It is also possible to keep the interval between B constant. Further, in this embodiment, the number of the bagged segments 2 provided in one segment ring 12 is one, but a plurality may be provided. In addition, the interval at which the segment 2 with a bag is provided can be appropriately changed.

[Second Embodiment] FIG. 4 is a perspective view showing an installation structure of a segment structure according to a second embodiment of the present invention. FIG. 5 is a side view showing the installation structure of the segment structure shown in FIG. Except for the parts unique to the second embodiment, the configuration is the same as that of the first embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the segment structures 10A and 10B which are installed on
In FIG. 4, as shown in FIG. 4, a sharp curve portion 9 in which the direction of excavation of the shield excavating device changes abruptly is provided. At least a part of the segment arranged in the sharp curve portion 9 is constituted by the segment 2 with a bag. That is, in the sharp curve portion 9, the segment structures 10A and 10B are
, A segment ring 11 consisting of only ordinary segments 1,... And a segment ring 13 consisting of only segments 2 with bags are provided, respectively. The segment ring 13 consisting of only the bagged segments 2,...
The segment structure 10A and the segment structure 10B are arranged at three end positions and do not overlap one another.
Are arranged at positions shifted in the axial direction by several rings (for example, two rings).

As shown in FIG. 4 and FIG. 5, the bag-attached segment 2 comes into contact with the outer peripheral surface of the adjacent segment structure and the ground 6 when the bag 2a is filled with the backing material. It has become. That is, segment 2 with a bag
The bag 2a filled with the backing material is
A, a gap 5b between 10B and a segment structure 10A,
By interposing in the gap 5a between the ground 0B and the ground 6,
The distance between the segment structures 10A and 10B and the distance between the segment structures 10A and 10B and the ground 6 are kept constant.

Therefore, even if the backing material 4 filled in the gaps 5a and 5b is hardened, the segment structure 10 is hardened even in the sharply curved portion 9 where the overhang is likely to be large.
The displacement of the relative positions of the segments A and 10B can be minimized, and the positions of the segment structures 10A and 10B can be shifted in the vertical direction and the horizontal direction (curved direction) with respect to the ground 6. Can be eliminated as much as possible. Therefore, in the sharp curve portion 9, each segment structure 10
It is possible to prevent the positions of A and 10B from being shifted from the positions where they should be installed as much as possible.

In this embodiment, the segment rings 13 consisting only of the segments 2 with bags are provided at the three positions of the start end, the center and the end of the sharply curved portion 9 of the segment structures 10A and 10B. Although the configuration is adopted, the present invention is not limited to this.
, Or the radius of curvature of the sharp curve portion 9 or the like.

In each of the above embodiments, a cylindrical segment structure is exemplified. For example, a segment structure having a polygonal (for example, square, hexagonal, etc.) cross-sectional shape of a side wall may be used. It is also possible to apply the present invention. In addition, as a plurality of segment structures, a segment structure 10A that is installed in the ground 6 in close proximity in the vertical direction,
Although 10B has been illustrated, the present invention is not limited to this, and may be applied to other segment structures as long as it is a segment structure installed in the ground 6 in parallel and close to each other. is there. For example, it is also possible to arrange the segment structures on the ground 6 side by side, or to increase the number of the segment structures. Others
It goes without saying that specific details such as the structure of the segment 2 with a bag can be appropriately changed without departing from the spirit of the present invention.

[0030]

According to the first aspect of the present invention, the backing material is filled in the bag of the segment with the bag, so that the segment with the bag comes into contact with the outer peripheral surface of the adjacent segment structure, and The distance between the segment structures is kept constant. Therefore, it is possible to minimize the displacement of the relative positions of the plurality of segment structures. Further, it is possible to prevent the segment structures from being damaged due to the contact between adjacent segment structures.

According to the second aspect of the present invention, when at least a part of the plurality of segment structures is installed on the ground in a line up and down, the interval between adjacent segment structures is kept constant. It will be. Therefore, the position of the upper segment structure is prevented from shifting in the direction of the lower segment structure as much as possible until the backing material filled in the gap between the segment structures hardens. Can be. Therefore, the position of each segment structure is
It is possible to minimize the deviation from the position where it should be installed.

According to the third aspect of the present invention, the backing material is filled in the bag of the segment with the bag, so that the segment with the bag comes into contact with the outer peripheral surface of the adjacent segment structure and the ground. The distance between adjacent segment structures and the distance between the segment structures and the ground are kept constant. Therefore, in the sharply curved portion where the overhang is likely to be large, a plurality of segments are required until the backing material filled in the gap between the segment structures or the gap between the segment structure and the ground hardens. The displacement of the relative position of the structure can be minimized, and the position of the segment structure can be minimized in the vertical and horizontal directions with respect to the ground. Therefore, in the sharp curve portion, the position of each segment structure is
It is possible to minimize the deviation from the position where it should be installed.

[Brief description of the drawings]

FIG. 1 is a side view showing an installation structure of a segment structure as a first embodiment to which the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1;

FIG. 3 is a front view showing an example of a segment with a bag.

FIG. 4 is a perspective view showing an installation structure of a segment structure as a second embodiment to which the present invention is applied.

FIG. 5 is a side view showing an installation structure of the segment structure shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Normal segment 2 Segment with bag 2a bag 3 Excavation hole 4 Backing material 5a, 5b Air gap 6 Ground 9 Steep curve part 10A, 10B Segment structure 11, 12, 13 Segment ring

Claims (3)

[Claims] A cylindrical segment structure formed by joining a plurality of segments in a circumferential direction and an axial direction is a plurality of segment structure installation structures which are installed close to each other in parallel and close to each other. At least one of the adjacent segment structures has at least a part of the segment at a portion opposed to the other segment structure formed of a segment with a bag, and the segment with a bag is provided in the bag. In the state in which the backing material is filled, by contacting the outer peripheral surface of the adjacent segment structure, the interval between the adjacent segment structures is kept constant. Installation structure. 2. The installation structure for a segment structure according to claim 1, wherein the plurality of segment structures are installed on the ground with at least a part of each being vertically arranged. 3. The installation structure of a segment structure in which a plurality of cylindrical segment structures formed by joining a plurality of segments in a circumferential direction and an axial direction are installed in parallel in close proximity to ground. The plurality of segment structures have a sharply curved portion in which the direction of excavation of the shield excavating device changes abruptly, and at least a part of the segments arranged in the sharply curved portion is constituted by a segment with a bag, The segments abut the outer peripheral surface of the adjacent segment structures and the ground in a state where the backing material is filled in the bag, so that the distance between the adjacent segment structures and the distance between the segment structures and the ground are increased. An installation structure for a segment structure, characterized in that the intervals are kept constant.