JP2004250957A - Construction method of large sectional tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a large sectional tunnel having a straight line section and a curved line section. <P>SOLUTION: When the large sectional tunnel is constructed, a shield box body 3 and a plurality of propulsive pipes 4 are mutually and adjacently provided to construct a lining body. First of all, after the shield box body 3 has been installed by a shield boring machine 1, a shield outline 11 and a shield jack 12 are removed from the shield boring machine 1 to make it as a boring machine 2, and the propulsive pipes 4 are adjoined to each other to install while pushing out the boring machine 2 and the propulsive pipes 4 by a propulsive jack 5 to construct the lining body. After then, the large sectional tunnel having the curved line section and the straight line section is constructed by constructing the large sectional tunnel. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for constructing a large-section tunnel, in which a shield box and a plurality of propulsion pipes are installed adjacent to each other to construct a lining body, and then a large-section tunnel is constructed.
[0002]
[Prior art]
In the case of constructing an underground flyover tunnel under a road or a railway, in order to avoid obstacles to ground traffic due to the excavation method, the construction method using a shield method or a propulsion method is generally used.
In the case of the shield method, a segment b with a width of about 1.0 m is assembled. However, a straight segment can be assembled in a straight section, and a curved segment can be assembled in a curved section. Is possible. Further, in a curved section, as shown in FIG. 5, a center-bent shield excavator a can be used (see Patent Document 1).
In the shield method, a clearance c is necessarily generated in the tail portion due to its structure.
On the other hand, in the case of the propulsion method, a tunnel is constructed by sequentially adding propulsion pipes while pushing the propulsion pipes into the ground with a propulsion jack.
By the way, underground tunnels have been increasing in cross section due to an increase in traffic volume and diversification of applications of underground tunnels in recent years. In addition, the alignment of the underground grade separation tunnel is complicated with an extended section including a straight section, a curved section, and a relaxation section thereof. Therefore, it has become a social need to construct a large-sized, linear and complicated tunnel. Patent Document 2 discloses a method in which a lining body constructed at the time of constructing a large-section tunnel is divided into a plurality of small-section tunnels, and the small-section tunnels are installed by a propulsion method so as to be adjacent to each other.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-120370 [Patent Document 2]
JP 2001-214699 A
[Problems to be solved by the invention]
The above-described conventional method for constructing a large-section tunnel has the following problems.
<A> When constructing a large-section tunnel, there is a method of constructing a lining body for a large-section tunnel while making small-section shield tunnels adjacent to each other. In such a case, a clearance region is created between the shield tunnels having a small cross section due to the clearance of the tail portion which is inevitably generated by using the shield machine. Since it is necessary to integrate the outer hull of the lining body by performing a separate mountain retaining work in the gap region, the construction period is lengthened and the cost is increased.
<B> When the above-mentioned lining body is constructed by the propulsion method, it is difficult to form a gap region between the small-section tunnels. However, when the shape of the tunnel is complicated including the curved section, it is extremely difficult to follow the shape of the tunnel while pushing the propulsion pipe.
[0005]
[Object of the invention]
The present invention has been made in order to solve the above-described conventional problems, and when a lining body to be constructed at the time of construction of a large-section tunnel is divided into small-section tunnels, a gap region does not occur between the small-section tunnels. It is an object of the present invention to provide a method of constructing such a large section tunnel. Another object of the present invention is to provide a method of constructing a large-section tunnel capable of constructing a lining body that follows the alignment when constructing a large-section tunnel having a complicated alignment including a curved section.
The present invention achieves at least one of these objects.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a shield box and a plurality of propulsion pipes are installed adjacent to each other, and after constructing a tunnel lining body, constructing a large section tunnel of the present invention, The construction method includes a first installation step of cutting the ground by the shield excavator having a shield shell and a shield jack to install a shield box, and the excavator and the propulsion pipe while the excavator cuts the ground. And extruding the excavator and the propulsion pipe with the propulsion jack while cutting the ground with the excavator, and extruding the excavator with the propulsion jack, and installing the propulsion pipe adjacent to the shield box. A third installation step of constructing a lining body by sequentially repeating the installation of the propulsion pipe or the propulsion pipe adjacent to the shield box whose installation has been completed, and the shield box By utilizing the tunnel space of the spare the propulsion tube a construction method comprising a large cross-section tunnels constructing step of constructing a large section tunnel.
In addition, the excavator can be the excavator by removing the shield shell and the shield jack from the shield excavator.
Further, a flexible member can be provided at the joint portion between the propulsion pipes. That is, since it is necessary to connect the propulsion pipes to a curved section of the tunnel while following the propulsion pipes linearly in the tunnel, the propulsion pipes are connected by the deformability of the flexible member.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
<B> Shield excavator (Figs. 1 and 2)
The shield machine 1 is a shield jack for extruding the shield machine 1 to the front of the excavation by using the turntable 13 having the excavation bit 15 on the entire excavation side, the shield shell 11, and the installed rear segment 31 as a reaction base. 12 or the like.
Although the shield shell 11 is usually formed in a substantially circular shape in cross section, it is preferable to form the shield shell 11 in a rectangular shape in cross section or a square shape in cross section when a tunnel having a rectangular cross section is constructed.
In addition, a rectangular cutter frame can be provided instead of the rotating disk 13. Such a cutter frame is supported by a plurality of drive shafts, and by rotating each drive shaft in the same direction to cause a parallel link motion in the cutter frame, it is possible to excavate a rectangular cross section (see FIG. 5).
The shield machine 1 used in the present invention may have a structure provided with a turntable 13 or a structure provided with a rectangular cutter frame. Here, in the case of a structure having the turntable 13, a small-section tunnel having a rectangular or square cross-section (a lining body constructed when constructing the large-section tunnel 6 is divided into a plurality of small-section tunnels and installed. In order to construct such a small cross-section tunnel, a widening cutter 14 is provided on the turntable 13. That is, a widening cutter 14 is provided on a side surface of the rotating disk 13 so as to be expandable and contractible in the radial direction of the rotating disk 13. The ground can be cut in accordance with the corners of the rectangular cross section by extending 14 and contracting the widening cutter 14 away from the corners.
The shield machine 1 can be constructed even when the tunnel alignment is a straight line or a curved line, or when the tunnel alignment is a composite alignment having a straight section 61 and a curved section 62. Therefore, the shield method has a wider application range than the propulsion method, which is difficult to construct when the tunnel line is a composite line having a straight section 61 and a curved section 62. In particular, since the present invention relates to a construction method which is capable of constructing a tunnel having a large section and including a curved section 62 (including a sharp curve), it is necessary to use the shield machine 1. In the construction of the curved section 62, a middle bend shield excavator or the like can be used (see FIG. 5).
[0009]
<B> Shield Case The method of constructing the large-section tunnel 6 of the present invention is a method of constructing a lining body for constructing the large-section tunnel 6 while making the small-section tunnels adjacent to each other. In this construction method, the shield box 3 is installed using the shield machine 1 in the small section tunnel to be installed first. The purpose of installing the shield box 3 first is that the shield method can construct a compound linear small-section tunnel having a straight section 61 and a curved section 62. With the propulsion method, such construction becomes difficult.
The segment 31 forming the shield box 3 is formed, for example, to have a width of about 1.0 m, and one ring can be formed by connecting divided pieces obtained by dividing one ring into a plurality of sections in the cross-sectional direction (see FIG. 1). When manufacturing the divided pieces, the formwork used when manufacturing the propulsion tube 4 described later can be diverted.
[0010]
<C> The excavator 2 preferably uses the shield excavator 1 from which the equipment such as the shield shell 11 and the shield jack 12 has been removed for the propulsion method. In the present invention, after the shield box 3 is installed, the propulsion pipes 4 are installed adjacent to each other to construct a lining body for large-section tunnel construction. Therefore, the cost can be reduced by using both the shield machine 1 and the machine 2. In addition to the shield machine 1, a machine 2 for the propulsion method can be used. In such a case, the excavation of the shield excavator 1 is performed first, and the adjoining trailing excavator 2 is used at the same time, thereby shortening the construction period.
Since the excavator 2 cannot excavate by itself, unlike the shield excavator 1, the excavator 2 is pushed into the ground by the propulsion jack 5 from behind the propulsion pipe 4 attached to the rear of the excavator 2. You can perform excavation while you
[0011]
Here, the small section tunnel to be installed first is the shield case 3 and the small section tunnel to be installed thereafter is the propulsion pipe 4. When the shield machine 1 is used, the clearance is inevitably formed in the tail part. This is because, since c occurs, when a small-section tunnel is installed adjacently using only the shield excavator 1, a gap region is generated between the small-section tunnels. Since it is necessary to perform separate retaining work such as ground improvement and installation of steel pipe piles in the gap region, the construction period is prolonged and the cost is increased. On the other hand, this problem is unlikely to occur with the propulsion method. However, it is difficult to construct the curved section 62 and the like by using the propulsion method alone.
Therefore, a method is proposed in which the shield excavator 1 used for the shield method and the excavator 2 used for the propulsion method are used for the purpose of cost reduction while incorporating the advantages of the shield method and the propulsion method. .
The excavator 2 is excavated along an adjacent shield box 3 already installed or a guide provided on the outer surface of the propulsion pipe 4 so that the propulsion pipes 4 or the propulsion pipe 4 and the shield box 3 are excavated. Can be installed adjacent to each other.
[0012]
<D> Propulsion Pipe The propulsion pipe 4 can be formed to have a width of, for example, about 1.0 m in accordance with the segment 31. As the shape of the propulsion pipe 4, one ring formed into a rectangle or a square in a sectional view can be integrally manufactured.
The joint between the propulsion pipes 4 may be made with, for example, bolts, and a flexible member 41 may be provided to ensure the flexibility of the joint. The flexible member 41 can be made of, for example, a rubber material.
[0013]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
<A> First Installation Step This is a step of constructing the first small section tunnel to be installed as the shield box 3 using the shield machine 1 among the small section tunnels constituting the lining body (FIG. 4 (a) )reference).
[0015]
<B> Second installation process After constructing the shield box 3, the propulsion pipe 4 is attached to the rear of the excavator 2, and the excavator 2 and the propulsion pipe 4 are pushed out of the ground by the propulsion jack 5 from behind the propulsion pipe 4. This is a step of installing the propulsion pipe 4 adjacent to the shield box 3 already installed while adding the propulsion pipe 4 (see FIG. 4B). In addition, it is also possible to remove the equipment such as the shield shell 11 and the shield jack 12 from the shield machine 1 to form the machine 2.
Here, a flexible member 41 can be provided at the joint between the propulsion tubes 4. If the tunnel alignment has a curved section 62, it is necessary for the propulsion pipe 4 to follow the alignment of such a curved section 62. In view of this, a flexible member 41 is provided at the joint between the propulsion pipes, and the flexible member 41 is made to exhibit the deformation performance so that the flexible member 41 follows the tunnel linearly.
[0016]
<C> Third installation step This is a step of sequentially installing the propulsion pipes 4 already installed or the propulsion pipes 4 adjacent to the shield box 3 to complete a lining body having a desired size ( FIG. 4C).
[0017]
<D> Large cross section construction step This is a step of constructing a large cross section tunnel 6 using the tunnel space of the shield box 3 and the propulsion pipe 4 after the completion of the lining body (see FIG. 4D).
Here, the large-section tunnel 6 is constructed while removing the shielding box 3 and the propulsion pipe 4 that are not necessary for the large-section tunnel 6 structural members. Therefore, the structural members of the shield case 3 and the propulsion pipe 4 constituting the outer shell of the lining body can be formed in advance so that they can also be used as the structural members of the large-section tunnel 6.
[0018]
【The invention's effect】
Since the method for constructing a large-section tunnel according to the present invention is as described above, the following effects can be obtained.
<B> A large cross-section underpass can be constructed in a relatively short period without hindering ground traffic.
<B> Construction of a large-section tunnel having a tunnel alignment having straight sections and curved sections can be performed at relatively low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a situation in which a propulsion pipe adjacent to a shield box is installed.
FIG. 2A is a longitudinal sectional view of a shield machine and a shield box. (B) A longitudinal section of the excavator and the propulsion pipe.
FIG. 3A is a plan view showing a tunnel alignment having a straight section and a curved section. (B) Sectional drawing of figure (a).
FIG. 4 is an explanatory diagram illustrating a construction flow, and (a) a first installation step. (B) Second installation step. (C) Third installation step. (D) Explanatory drawing explaining the large cross section construction process.
FIG. 5 is an explanatory view for explaining that a clearance is generated in a tail portion by a conventional half-bent shield machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Shield excavator 11 ... Shield outer shell 12 ... Shield jack 2 ... Excavator 3 ... Shield box 4 ... Propulsion pipe 41 ... Flexible member 5 ... Propulsion jack 6 Large tunnel

Claims (3)

A large section tunnel construction method in which a shield box and a plurality of propulsion pipes are installed adjacent to each other and a large section tunnel is constructed after constructing a tunnel lining body,
A first installation step of installing a shield box by cutting the ground with the shield machine having a shield shell and a shield jack,
A second installation step of extruding the excavator and the propulsion pipe with a propulsion jack while cutting the ground with an excavator, and installing a propulsion pipe adjacent to the shield box,
The excavator and the propulsion pipe are pushed out by a propulsion jack while the excavator cuts the ground, and the installation of the propulsion pipe that has been installed or the propulsion pipe adjacent to the shield box is sequentially repeated. A third installation step of constructing a lining body by
A large-section tunnel construction step of constructing a large-section tunnel using the tunnel space of the shield box and the propulsion pipe,
Construction method of large section tunnel. The shield excavator and shield jack are removed from the shield excavator to make it an excavator.
The method for constructing a large-section tunnel according to claim 1. Characterized in that a flexible member is provided at a joint portion between the propulsion pipe and the propulsion pipe,
The method for constructing a large-section tunnel according to claim 1 or 2.

Images