JP2879101B2 - Construction method of shield machine and tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine and a tunnel construction method.

[0002]

2. Description of the Related Art A conventional tunnel construction method using a shield excavator is performed by removing earth and sand in front of the shield excavator and moving the fuselage forward. After excavation, segments are assembled or concrete is cast to protect the ground.

[0003]

The above-mentioned conventional shield machine and tunnel construction method have the following problems. <B> In the conventional shield machine, when the tunnel cross section becomes large, the shield machine becomes extremely large, and the equipment required for excavation increases accordingly. In addition, when the cross section becomes large, there is a problem in stability of the face. <B> The conventional method is a method of constructing a lining in a state in which earth and sand inside are eliminated. Therefore, when the internal space of the tunnel increases, the bending moment generated in the lining increases, and it is necessary to increase the thickness of the lining. In addition, it is necessary to increase the rigidity of the joint portion, but there is a limit to the rigidity when fastening is performed only from the inside. <C> Also in the case of using a segment, since the segment designed with the internal soil removed is used, its thickness and weight are increased, and assembling work is difficult. <D> When the excavated soil is muddy or muddy, it becomes an industrial waste and requires enormous cost and trouble. There is also a shortage of places to treat the excavated soil.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a shield excavator and a tunnel construction method which are economical in construction and construction of a machine body and safe in operation. Aim.

[0005]

That is, the present invention comprises a plurality of cylindrical cylinders, an outer steel shell, and an inner steel shell, and the outer steel shell and the inner steel shell are provided between the cylinders. A shield excavator with a closed cross-section is formed by connecting with the steel shell, and in the cylindrical part, a device to assemble the segment inside the space after excavation and a device to insert the segment toward the steel shell joint are installed. It was a shield machine. Further, the present invention comprises a plurality of cylindrical tubular parts, an outer steel shell, and an inner steel shell, and the cylindrical body part and the cylindrical body part are connected by the outer steel shell and the inner steel shell. Forming a shield machine with a closed cross section, assembling segments inside the excavated space in the cylinder, and inserting segments from the cylinder into the excavated space in the steel shell connection This is a tunnel construction method in which the segment group thus configured is installed in the ground, and then the inside of the closed section surrounded by the segment group is excavated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield machine according to the present invention will be described below with reference to the drawings. A typical shield machine is a cylindrical shape or an eight-shape in which cylinders are doubled, but the shield machine used in the construction method of the present invention is particularly a plurality of cylindrical cylinders and an outer steel shell. And an inner steel shell . In the following embodiments, the case where the outer steel shell and the inner steel shell are formed on a curved surface will be described. However, the present invention is not limited to the case where the outer steel shell and the inner steel shell are formed in a curved shape, and may be formed in a flat shape.

<A> Cylindrical Portion The cylindrical portion 1 is provided with a rotary cutter 11 on the front surface similarly to a conventional cylindrical shield excavator, and a plurality of shield jacks 12 are arranged inside. On both side surfaces of the cylindrical shape, long windows 13 are opened in parallel to the axial direction of the cylindrical shape.

<B> Steel Shell The plurality of cylindrical bodies 1 are connected to each other by the outer steel shell 2 and the inner steel shell 3. The inner and outer steel shells 2 and 3 are curved or flat steel plates, and the inner and outer steel shells 2 and 3 are arranged in parallel. The long shell 13 of one cylindrical part 1 and the long window 13 of the adjacent cylindrical part 1 are connected by this steel shell. By sequentially connecting the cylindrical portions 1 in this manner, a shield machine having a rectangular, elliptical, or other closed cross section can be formed. A plurality of steel shell cutters 21 are disposed in front of a space surrounded by the inner and outer steel shells 2 and 3, and a number of jacks 22 are installed rearward inside the steel cutter 21.

<C> Segment assembling device A device for assembling the segments and a device for pushing out the connecting segments 4 to the side are installed in the cylindrical portion 1. The segment assembling apparatus is an apparatus for assembling a segment inside a cylindrical space after excavation in the same manner as a normal shield excavator. On the other hand, the connecting segment extruding device has a cylindrical body 1
Is a device for extruding and inserting the connecting segment 4 or the steel box 5 from the long window 13 toward the space between the inner and outer steel shells. This device uses a jack that expands and contracts in a direction perpendicular to the axial direction of the cylindrical body portion 1, that is, in a circumferential direction, and forms an arc-shaped or planar connecting segment 4 or a steel box 5.
Is pushed out of the long window 13 by a jack.

<D> Structure of Steel Box The connecting segment extruding device may extrude a concrete connecting segment 4, but use a steel hollow container not filled with concrete, that is, a steel box 5. In some cases. As shown in FIG. 10, the structure of the steel box 5 has keys
The air vent tube hole 52 and the concrete injection hole 53 are opened at both ends. Further, joint boxes 54 are provided at the upper and lower edges of both ends. Conventionally, the joint box 54 exists only inside the connecting segment 4 and cannot be provided outside. However, in the apparatus of the present invention, the steel box 5 can be connected to the inside of the cylindrical body portion 1 so that the joint box 54 can be provided on the outside thereof.
Can be combined.

[0011]

Next, a description will be given of a case where a tunnel is constructed using the above-described apparatus. <A> Configuration of shield machine The shield machine according to the present invention, as described above, connects between the cylindrical body part 1 and the cylindrical body part 1 with the outer steel shell 2 and the inner steel shell 3 to form a closed section. In particular, the position of the cylindrical body portion 1 is arranged at a position where the curvature of the lining portion of the tunnel changes.

<B> Excavation Since a cutter is disposed on the front surface of the cylindrical body 1 and on the front surface of the cross section surrounded by the inner and outer steel shells 2 and 3, excavation of the ground is performed by rotating the cutter. At the same time, the aircraft is advanced by applying a reaction force to the already assembled connecting segment 4 or group of steel boxes 5 by extending the internal jack.

<C> Assembling of the connecting segment 4 It is necessary to prevent the collapse of the ground by inserting a segment or a steel box 5 into the space that has advanced. For that purpose, in the cylindrical body portion 1, the arc-shaped segment is carried into the interior of the excavated space and assembled.

<D> Insertion of the steel box 5 On the other hand, at the steel shell connecting portion between the cylindrical body 1 and the cylindrical body 1, the steel box 5 is inserted into the space after excavation through the long window 13 of the cylindrical body 1.
Insert In this case, since only the steel box 5 having a length shorter than the diameter of the cylindrical body 1 can be handled, the steel boxes 5 are sequentially connected and inserted. In this case, as described above, since the connection can be made on the front, back, and both sides of the steel box 5, the connection is extremely strong.

<E> Injection of concrete The steel box 5 is provided at an appropriate time according to the state of advance of the shield machine.
Concrete is injected into the group to form a strong composite connecting segment. In this case, an air bleeding tube is inserted near the steel box 5 where there is a possibility that air may be concentrated according to the amount of concrete poured in a large number of steel boxes 5 and concrete is injected while bleeding air therefrom.

<F> Internal Excavation The composite connection segment constructed by the above steps is installed underground. Then, the ground of the closed cross section surrounded by the composite connecting segment group remains in the ground. In this way, the inside of the closed section whose periphery is firmly protected is safely excavated to complete the tunnel construction, which is the original purpose.

[0017]

As described above, the shield excavator and the tunnel construction method of the present invention have the following effects. <B> Since the shield is a ring-shaped excavator composed of the cylindrical body part 1, the outer steel shell 2, and the inner steel shell 3, even when the tunnel cross section is large, the airframe is not as large as the conventional shield excavator. The weight of the excavator can be reduced. <B> Since the excavated cross section is reduced, the stability of the face is improved. <C> This is a construction method in which the earth and sand inside the tunnel section is not removed first but only the lining corresponding to the contour part is preceded. Therefore, the ground pressure acts on the group of steel boxes 5 before and after the concrete is cast, from inside and outside, and since these pressures are almost balanced, the large sectional force generated when the inside is excavated is considered. No need. Therefore, it is not necessary to increase the strength of the steel box 5 so much, the manufacture is simple, and the weight is small, so that the handling including the assembling work is easy and economical.

<D> In a range other than the cylindrical portion 1, construction is performed only with the steel box 5 during assembly, and concrete can be injected into the interior later. Therefore, the excavation and shearing-out work and the concrete pouring work can be performed separately, and efficient work can be performed without duplication of the work. <E> The tubular portion 1 can be arranged at a portion where the curvature of the tunnel cross section changes. Therefore, the steel boxes 5 between the cylindrical portions 1 can be of the same curvature, and the workability is good. <F> The joint box 54 can be assembled inside the tubular body portion 1. Therefore, since the inner and outer surfaces of the steel box 5 can be sequentially connected, the rigidity of the joint, which is a usual weak point, can be increased, and a large number of steel boxes 5 can be firmly integrated. <G> Since a composite connecting segment having a structure in which concrete is poured into the inside of the steel box 5 is used, the critical resistance bending moment becomes larger than that of the RC structure having the same thickness, and R
The digit height can be made smaller than C. <H> Excavation of the inner ground of a closed section can be easily performed and is economical. The excavated soil in this area does not become industrial waste and is easy to treat.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shield machine according to the present invention as viewed from a face side.

FIG. 2 is a perspective view of the shield machine of the present invention viewed from a wellhead side.

FIG. 3 is a sectional view thereof.

FIG. 4 is an explanatory view of a construction order.

FIG. 5 is an explanatory view of a construction order.

FIG. 6 is an explanatory view of a construction order.

FIG. 7 is an explanatory view of a construction order.

FIG. 8 is an explanatory view of a construction order.

FIG. 9 is an explanatory view of a construction order.

FIG. 10 is an explanatory view of a steel box 5;

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000231198 Japan Land Development Co., Ltd. 4-9-1-9 Akasaka, Minato-ku, Tokyo (73) Patent holder 000236610 Fudo Construction Co., Ltd. Hirano-cho, Chuo-ku, Osaka-shi, Osaka 2-16, Chome (72) Inventor Yasuo Sato 3-9-5, Imaizumidai, Kamakura-shi, Kanagawa (72) Inventor Kiyoshi Miyamoto 2-8-8 Koraku, Bunkyo-ku, Tokyo Inside Goyo Construction Co., Ltd. (72) Inventor Hideki Kuwahara 13 Sumitomo Construction Co., Ltd., 13-13 Arakicho, Shinjuku-ku, Tokyo 4-9-9 Akasaka, Minato-ku Japan Soil Development Co., Ltd. (72) Inventor Toshiaki Oku 1-2-1, Taito 1-chome, Taito-ku, Tokyo Fudo Construction Co., Ltd. (56) References JP-A-2-24485 JP, A) (58) investigated the field (Int.Cl. ^6, DB name) E21D 9/06 301 E21D 9/10 E21D 11/40 E21D 13/02

Claims (8)

(57) [Claims] 1. A closed cylinder comprising a plurality of cylindrical cylinders, an outer steel shell, and an inner steel shell, wherein the cylinder is connected between the cylinders by the outer steel shell and the inner steel shell. A shield excavator that forms a shield excavator that is equipped with a device that assembles segments inside the space after excavation in the cylindrical body and a device that inserts the segments toward the steel shell joint. 2. The shield machine according to claim 1, wherein the outer steel shell and the inner steel shell are formed by curved surfaces. 3. The shield machine according to claim 1, wherein the outer steel shell and the inner steel shell are formed by planes. 4. The shield machine according to claim 1, wherein a plurality of cylindrical tubular portions are arranged at a portion where the curvature of the tunnel lining changes. 5. A plurality of cylindrical tubular portions, an outer steel shell,
It consists of an inner steel shell, and connects between the cylindrical part and the cylindrical part by the outer steel shell and the inner steel shell to form a shield excavator with a closed cross section. The segments were assembled inside the space, the segments were inserted from the cylindrical part into the space after excavation at the steel shell connection, and the segments configured in this way were installed underground, and then surrounded by the segments A tunnel construction method that excavates the inside of a closed section. 6. A plurality of cylindrical tubular portions, an outer steel shell,
It consists of an inner steel shell, and connects the cylindrical body with the outer steel shell and the inner steel shell to form a shield excavator with a closed cross section. The segment group was inserted from the cylindrical part into the space inside, and the group of segments configured in this way was installed underground.In the cylindrical part, the segment was assembled inside the excavated space, and then surrounded by the group of segments A tunnel construction method that excavates the inside of a closed section. 7. At the steel shell connecting portion, a steel hollow segment is inserted from the cylindrical portion into the interior of the excavated space, and the segment group thus configured is installed underground. The tunnel construction method according to claim 5, wherein concrete is cast inside to form a composite segment, and the inside of the closed section surrounded by the composite segment group is excavated and performed. 8. The length of the segment to be inserted into the steel shell connecting portion is formed to be smaller than the diameter of the cylindrical portion, and at the steel shell connecting portion, the segment from the cylindrical portion is inserted into the space after excavation. 6. The tunnel construction method according to claim 5, wherein, when inserting, the inside and the outside of the segment are sequentially connected in the tubular body.