JP2003064995A - Construction method of shield tunnel and segment for opening part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a shield tunnel capable of easily forming an opening part in a short time by eliminating secondary lining and to provide a segment for the opening part used for an opening planned part of the tunnel. SOLUTION: A segment ring 10 including the segments 11 and 12 for the opening part reinforced by previously burying reinforcing steel plates 11S and 12S at a position forming the opening part of the shield tunnel 40, and a segment ring 20 of a symmetrical shape on the segment ring 10 and the boundary are arranged, and the opening planned part 40P of the segment rings 10 and 20 are constituted of unreinforced concrete easier to remove than reinforced concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shield tunnel in which a tunnel is planned to be connected to another tunnel or a new tunnel in a direction intersecting with the tunnel, and a method for constructing a tunnel connecting point. The present invention relates to an opening segment used.

[0002]

2. Description of the Related Art Generally, a shield tunnel is formed by forming a starting shaft from the surface of the earth, inserting a shield machine into the shaft to start the shaft, and performing the excavation work. The ground cutter is excavated by the main cutter provided on the front surface of the shield machine main body, and the shield machine is propelled while the segments are sequentially assembled at the rear part to construct a shield tunnel. by the way,
In a shield tunnel, there are many cases where a tunnel constructed in a direction crossing the tunnel or a tunnel to be constructed is connected to the tunnel, or a new branch line is provided in the tunnel. Conventionally, when performing such construction, first, the inside of the segment ring around the planned opening that will be the connection part of the shield tunnel (the inside of the mine) is reinforced with shaped steel and reinforced concrete,
After that, a method of removing the planned opening portion of the segment ring is adopted. Specifically, as shown in FIG.
First, a region having a length substantially equal to the length of the opening diameter, which is adjacent to the planned opening portion 50P that is a connection portion with the branch line 50L of the shield tunnel 50 (here, the segment rings 51a and 51b to be the planned opening portion 50P and , Segment rings 52, 5 adjacent to the segment rings 51a, 51b
3), a plurality of reinforcing rings 54 are provided, and the segment rings 51a, 51b, 5 near the opening planned portion 50P are arranged.
Reinforcement to increase the rigidity of 2,53. Next, a plurality of beam members 55 are installed around the planned opening portion 50P, and column members 56 that support the beam member 55 are installed on both sides of the planned opening portion 50P. Between the pillar members 56, a defect ring 57, in which a portion corresponding to the opening is cut out, is installed to reinforce the planned opening portion 50P, and cast-in-place reinforced concrete is constructed around the planned opening portion 50P, and then the opening is formed. The scheduled part 50P is removed. At this time, the beam member 55 supported by the column member 56 receives the axial force acting on the defect ring 57 to secure the strength of the opening after the planned opening 50P is removed. There is.

[0003]

However, according to the above-mentioned conventional method, the shaped steel material such as the beam member 55, the pillar member 56, the defective ring 57, etc. built in the shield tunnel 50 remains as it is after the opening forming work. It is left in the tunnel 50. These members are designed to fit within the thickness of the secondary lining, but in a tunnel in which the secondary lining is omitted, the inner diameter of the tunnel around this connection portion becomes narrow. Therefore, when a tunnel is planned to be constructed or connected in a direction crossing the shield tunnel 50, it is necessary to construct a tunnel with a large diameter in advance.
Therefore, there are problems that the utilization efficiency of the tunnel is poor and that the construction period is long. Further, in the conventional construction method, not only the secondary lining is required, but also the RC segment or the steel segment which is usually used as a segment has high strength, and therefore workability in removing the above-mentioned opening portion 50P is also improved. It was bad.

The present invention has been made in view of the conventional problems, and a method of constructing a shield tunnel which can omit the secondary lining and easily form an opening in a short period of time, and the above tunnel. It is an object of the present invention to provide a segment for an opening used for a planned opening of the.

[0005]

In the method for constructing a shield tunnel according to claim 1 of the present invention, an opening segment which is previously formed integrally with a reinforcing member is arranged at a portion to be opened in the shield tunnel. With this configuration, the reinforcing structural member does not occupy the inner space, the reinforcing work for the opening is simplified, and the segment of the opening can be immediately removed.

The opening segment according to claim 2 is
It is a segment that is arranged at a planned opening portion in the shield tunnel, and is formed by integrally forming reinforced concrete and a reinforcing member so that sufficient strength can be secured even if the opening portion is removed. In the opening segment according to the third aspect, a reinforcing steel plate is embedded inside the segment to reinforce the segment. The opening segment according to claim 4 is a segment of the above-mentioned claim 3 provided with a joint portion exposing a part of the reinforcing steel plate, whereby a plurality of segments including the segment are provided. It is possible to further improve the strength of the segment ring by simply joining the joining points by welding or the like when assembling the segment ring of the opening planned portion by using the segment ring. In the opening segment according to claim 5, a reinforcing ring is embedded in a peripheral portion of a planned opening portion of the segment according to claim 3 or 4, and the reinforcing ring and the reinforcing steel plate are joined together. With the above ring,
In addition to forming a partition for the planned opening portion, the reinforcing effect is enhanced by an integral structure with the reinforcing steel plate.

Further, in the opening segment according to claim 6, the planned opening portion of the segment according to any one of claims 2 to 5 is removed from the reinforced concrete constituting the RC segment which is generally used. It is made of an easy material, which makes it easy to remove the planned opening. In the opening segment according to the seventh aspect, the planned opening portion is made of unreinforced concrete or fiber concrete. In the opening segment according to the eighth aspect, in order to facilitate the construction work for removing the planned opening portion, the planned opening portion of the segment is a void, and a detachable lid member is attached to the void.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are vertical cross-sectional views showing a configuration of a main part in the vicinity of a planned opening part in the shield tunnel according to the present embodiment, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. It is a BB sectional view. In FIG. 1, reference numerals 10, 20 and 30 denote segment rings constructed in a shield tunnel 40, which are formed by assembling a plurality of segments. Among them, two segment rings 10 and 20 adjacent to each other have an opening planned portion 40P. The reference numeral 30 and 30 are segment rings of a normal RC segment adjacent to the segment rings 10 and 20. In the shield tunnel 40 of this example, the segment rings 10, 20
The center of the planned opening portion 40P is positioned on the side surface of the boundary portion of. As shown in the front sectional view of FIG. 2 and the front sectional view of the connection portion (boundary portion) of FIG. 3, the segment ring 10 in the planned opening portion has a reinforcing steel plate 11S,
The opening segments 11 and 12 having 12S and the normal RC segments 13 to 15 are assembled and configured.
The segment ring 20 has a symmetrical structure with respect to the segment ring 10 and the boundary surface thereof, and is constructed by assembling an opening segment similar to the opening segments 11 and 12 and a normal RC segment. To be done. As shown in FIG. 4, the opening segment 11 includes a reinforcing steel plate 11 at a portion other than the planned removal portion 11P between the segment base materials 11a and 11b made of reinforced concrete.
In addition to burying S, a reinforcing ring 11R is embedded and reinforced at the peripheral edge of the planned removal site 11P.
As shown in FIG. 3, the reinforcing steel plate 11S and the reinforcing ring 11R are attached to the front side and the back side by sibeling, and the reinforcing steel sheet 11S and the reinforcing ring 11R are welded together to form the segment base material 11a. , 11b are integrally formed with a reinforcing steel plate 11S and a reinforcing ring 11R that are reinforcing members. Accordingly, the strength around the opening planned portion 40P can be further increased. In addition, since the reinforcing ring 11R serves as a partition member, the planned opening portion 40P is formed.
Can be easily removed. The reinforcing steel plate 11S is provided on each of the opening segment 21 side and the opening segment 12 side of the opening segment 11.
Are provided with joint portions 11Z and 11Y which are exposed. Further, in the opening segment 11 described above,
The planned removal site 11P located on the side of the opening segment 21 was made of unreinforced concrete. The opening segment 12 also has the same structure as the opening segment 11, and the opening segments 21 and 22 have the same structure as the opening segment 11 and have a structure symmetrical with respect to the boundary surface. Have. In addition, planned removal points 11P, 1
The 2P, 21P, and 22P form the planned opening portion 40P.

Next, a method of forming the opening in the shield tunnel 40 will be described. When constructing the shield tunnel 40 of the present embodiment, a connection point between the tunnel constructed in the direction intersecting with the tunnel 40 or the tunnel to be constructed and the tunnel 40, or
At a location where a branch line 40L is newly provided in the tunnel 40, the segment ring 10 using the opening segment 11, 12 and the opening segment 21, 2 are used.
The segment ring 20 using No. 2 is assembled adjacently so that the opening planned part 40P with a circular cross section is formed. Specifically, first, in order from the opening segment 12 that is the lower segment, the segment 1 that is the side segment
3, assembling the opening segment 11 and the segment 14, and finally, assembling the segment ring 10 by inserting the K segment 15 which is a segment of the ceiling portion between the segment 14 and the opening segment 11; Assemble the segment ring 20 in the same manner.

Next, the joint 11Y of the opening segment 11 and the joint 12Y of the opening segment 12 and the joint 21Y of the opening segment 21 and the joint 22Y of the opening segment 22 are welded, respectively. Etc. to reinforce the segment rings 10 and 20, and further, the joint portion 11Z of the opening segment 11 and the joint portion 21Z of the opening segment 21 and the joint portion 12Z of the opening segment 12 and the opening portion. Segment 22
The joint portion 22Z is connected by welding or the like to join the segment ring 10 and the segment ring 20 to reinforce the segment rings 10 and 20 at the planned opening portions. After that, the ground around the planned opening portion 40P is improved so that the planned opening portion 40P (the planned removal points 11P and 12P of the opening segment 11 and 12 and the opening segments 21 and 22).
The planned removal positions 21P and 22P) are removed to form openings on the side surfaces of the segment rings 10 and 20.
In the present embodiment, since the material forming the planned opening portion 40P is unreinforced concrete that is easier to remove than reinforced concrete, the removal work can be easily performed. As a result, since the opening can be reinforced by a simple method without performing a secondary lining, the efficiency of the reinforcing work can be significantly improved as compared with the conventional one, and the safety of the work and the work period can be improved. Significant reduction can be achieved. Further, since a shaped steel material or the like is not built inside the shield tunnel 40, it is not necessary to make a tunnel larger than the required cross section. Therefore, the shield tunnel 40
The outer diameter of the shield tunnel 40 can be reduced, and the shield tunnel 40 can be efficiently constructed.

In the above-described embodiment, the opening segment 11 in which the reinforcing steel plate 11S is embedded and integrated between the segment base materials 11a and 11b is used, but instead of the reinforcing steel plate 11S, the reinforcement is used. The ring may be embedded. Further, the reinforcing ring and the reinforcing steel plate may be used together. Alternatively, as the opening segment 11, a reinforcing steel plate 11S may be attached or bolted to the inner circumferential side of the tunnel. Further, the material forming the planned opening portion 40P of the segment is not limited to the above-mentioned unreinforced concrete, and may be a material such as fiber (steel fiber reinforced) concrete that is easier to remove than ordinary reinforced concrete. Good.
Alternatively, the planned opening portion 40P of the segment is a void,
A configuration may be adopted in which a removable lid member is attached to the space. The lid member is attached to the opening segment 11 by, for example, being joined to the above-described reinforcing ring 11R with a bolt or the like. Further, in the above example, the segments of the segment rings 10 and 20 at the planned opening are assembled by aligning the joint positions (potato joints), but the present invention is not limited to this, and the planned opening reinforced by the reinforcing member is used. Any structure may be used as long as the planned opening 40P is formed by the segment rings 10 and 20, and the joint structure may be a staggered set in which the joint positions are displaced. In addition, the segment ring 3 adjacent to the segment rings 10 and 20 in the planned opening portion
Due to the strength, the joint structure with 0 is usually staggered. Further, in the above example, the center of the planned opening portion 40P is positioned on the boundary surface between the segment rings 10 and 20, but the present invention is not limited to this, and the position of the planned opening portion 40P is the opening diameter and the segment width. From the above relationship, it is appropriately determined in consideration of the reinforcement range and the manufacturability of the segment. Therefore, the planned opening portion 40P may be positioned, for example, at the center of the segment ring, and the reinforcement range may extend not only to the segment having the planned opening portion 40P but also to the adjacent segment. .

[0012]

As described above, according to the present invention,
Since the segment ring including the segment reinforced by the reinforcing member in advance is arranged in the planned opening portion of the shield tunnel, the opening portion can be reinforced by a simple method. Therefore, the opening can be formed without performing the secondary lining, and the work safety and the work period can be significantly shortened. Further, since the inner space of the tunnel is not narrowed, the outer diameter of the tunnel can be reduced and the economy is high. In addition, the planned opening of the segment can be made of reinforced concrete or fiber concrete that is easier to remove than reinforced concrete, or the planned opening can be made a void and a removable lid member can be attached to the void. , The removal work can be easily performed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a configuration of a main part near an opening of a shield tunnel according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a segment ring for an opening according to the present embodiment.

FIG. 3 is a front sectional view showing a connecting portion of a segment ring for an opening according to the present embodiment.

FIG. 4 is a diagram showing an outline of an opening segment.

FIG. 5 is a diagram showing a conventional method of forming an opening.

[Explanation of symbols]

10, 20 Segment ring of opening scheduled portion, 11P, 12P, 21P, 22P Scheduled removal portion, 11S, 12S, 21S, 22S Reinforcing steel plate, 11R, 12R, 21R, 22R Reinforcing ring, 11a, 11b Segment base material, 11Y , 12Y, 21Y, 22Y Joints (for same ring), 11Z, 12Z, 21Z, 22Z Joints (for adjacent ring), 13-15, 23-25 RC segment, 30 segment ring, 40 shield tunnel, 40P opening planned Department.

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 000172813             Sato Industry Co., Ltd.             11-11 Sakuragicho, Toyama City, Toyama Prefecture (71) Applicant 000230010             Geostar Co., Ltd.             4 2-3 Shiba, Minato-ku, Tokyo (71) Applicant 000001236             Komatsu Ltd.             2-3-3 Akasaka, Minato-ku, Tokyo (72) Inventor Shugi Komatsubara             2-6-2 Otemachi, Chiyoda-ku, Tokyo East             Kyoto Sewer Service Co., Ltd. (72) Inventor Noriyasu Yamamori             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi (72) Inventor Yoshinori Kitano             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi (72) Inventor Yoichi Moriya             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Tokyo Main Office (72) Inventor Noboru Sekimoto             4-12-20 Nihonbashihonmachi, Chuo-ku, Tokyo             Sato Industry Co., Ltd. (72) Inventor Masakazu Yokota             Geostar 4 2-3 Shiba, Minato-ku, Tokyo             Within the corporation (72) Inventor Yukio Kikuchi             2-3-3 Akasaka, Minato-ku, Tokyo Co., Ltd.             Komatsu Factory F-term (reference) 2D054 AA03 AA04 AC01 EA07 EA09                 2D055 BA01 BB01 EB01 KB04 KB08

Claims (8)

[Claims] 1. A method of constructing a shield tunnel, wherein an opening segment integrally formed with a reinforcing member in advance is arranged at a predetermined opening portion in the shield tunnel. 2. A segment for arranging at a predetermined opening portion in a shield tunnel, wherein the reinforced concrete and a reinforcing member are integrally formed, and the opening segment. 3. The opening segment according to claim 2, wherein a reinforcing steel plate is embedded inside the segment. 4. The opening segment according to claim 3, wherein the segment is provided with a joint where the reinforcing steel plate is partially exposed. 5. The opening according to claim 3 or 4, wherein a reinforcing ring is embedded in a peripheral portion of a planned opening portion of the segment, and the reinforcing ring and the reinforcing steel plate are joined to each other. Segment. 6. The segment for an opening according to claim 2, wherein the planned opening portion of the segment is made of a material that is easier to remove than reinforced concrete. 7. The opening segment according to claim 6, wherein the planned opening portion is made of unreinforced concrete or fiber concrete. 8. A segment for opening according to claim 2, wherein the planned opening portion of the segment is a void, and a detachable lid member is attached to the void.