JP3085121B2 - Construction method of large section tunnel and hinge structure segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constructs a plurality of small-section shield tunnels close to each other, connects and integrates the small-section shield tunnels, and excavates the inside thereof to construct a large-section tunnel. The present invention relates to a method of constructing a large-section tunnel and a hinge structure segment used for the method.

[0002]

2. Description of the Related Art As a method of constructing a tunnel having a large cross section, a shield method is widely used, such as a shield method using a large shield machine, a multi-circle shield method, and a square shield method for excavating a rectangular section. Various shield construction methods have been developed which enable excavation of a cross section or excavation of an arbitrary cross-sectional shape (for example, see JP-A-2-35190, JP-B-3-78917, etc.).

[0003]

However, in order to efficiently and economically construct a tunnel having a larger cross section, the size of the shield machine is limited.

For this reason, as shown in FIG. 5, for example, as shown in FIG. 5, a large number of small-section shield tunnels 1a are arranged close to each other, and the small-section shield tunnels 1a are connected to each other. Construction of 1A is being considered. In addition, in the figure, the code | symbol 3 has shown the rear excavation part. Also, the cutter portion of the shield machine 2 can be of various types and structures, and is not shown.

[0005] However, there is no record of construction of a large-section tunnel 1A in which a plurality of small-section shield tunnels 1a are connected to each other. There are still issues that need to be solved in order to achieve this.

For example, when a conventional general segment (a steel segment, a concrete segment, a steel-concrete composite segment, or the like) is used, an attempt is made to connect adjacent small-section shield tunnels with each other. In this case, it is necessary to cut or partially remove the segment, which is uneconomical and poses a problem in terms of construction safety.

An object of the present invention is to make it possible to construct a tunnel having a large cross-section and an arbitrary cross-sectional shape by devising a connecting method of such parallel small-section shield tunnels and a structure of a segment. It was done.

[0008]

According to a method for constructing a large-section tunnel according to claim 1 of the present application, a plurality of small-section shield tunnels are constructed in close proximity by using a shield machine, and a space between adjacent small-section shield tunnels is formed. By connecting and excavating the interior surrounded by these connected small-section shield tunnels, a large-section tunnel is constructed.

Further, in the present invention, as a segment at a connecting position between adjacent small-section shield tunnels,
Part of the segment ring of the small section shield tunnel
A segment formed, longitudinally <br/> intermediate position of the segment is provided with a hinge having a rotational axis extending in the tunnel axis, can be opened and closed a portion of the segment to the segment ring outwardly about the hinge And constructed adjacently
Connection with a segment of a small section shield tunnel
The hinge structure segment (corresponding to claim 5) which can be used as the above is used. That is, a hinge structure is introduced into the segment at the connection position among the segments laid by the shield machine having a small cross section, and the segment is movable around the hinge. Here, the longitudinal direction of the segment
Seg in the circumferential direction of the tunnel, that is, in the direction of the segment ring
Direction and the tunnel direction
In the width direction of the Also open outside the segment ring.
Closed means that the segments are assembled and connected.
Means that it can be opened and closed outside the
You.

The hinge structure segment is a segment that constitutes a part of the segment ring of each small-section shield tunnel as a whole. When the small-section shield tunnel is constructed, the hinge is closed and the first section of the shield tunnel is closed. Use as a segment.

The position of the hinge is not limited to one position,
It can be set freely according to construction conditions and the like.

After the construction of the small-section shield tunnel, when connecting the adjacent small-section shield tunnels, one of the joints in the tunnel circumferential direction of the hinge structure segment is disconnected, and the hinge structure segment is opened to the outside of the segment ring around the hinge,
The butt ends are joined on site. Thereby, the lining portion of the large-section tunnel can be constructed without damaging the existing segment.

In the construction using the hinge structure segment, when there is an unnecessary segment when connecting adjacent small-section shield tunnels, a part of the segment may be removed. Item 2 defines the case.

Claim 3 of the present application defines a case where the cross section of each small-section shield tunnel is rectangular. In the case of a rectangular cross-section, the connection of the small-section shield tunnel as a large-section tunnel lining member is defined. There is an advantage that the thickness can be uniform, but not limited to rectangular, circular, oval,
Depending on the cross-sectional shape of the shield tunnel (shape of the shield machine), any shape suitable for it is conceivable.

[0015] Claim 4 of the present application specifies that after connecting the small-section shield tunnels, concrete is poured into the small-section shield tunnel, and the large-section tunnel lining member has very high strength. A lining is formed. When placing concrete, rebars and steel frames will be placed in each small-section shield tunnel as necessary.

[0016]

FIG. 4 shows an example of an arrangement in which a lining portion of a large-section tunnel 1A is constituted by a plurality of small-section shield tunnels 1a. A plurality of small section shield tunnels 1a are constructed, and they are connected and integrated to form a lining of a rectangular section (usually, a reinforcing bar is arranged inside the lining by the small section shield tunnel 1a to form concrete. And then excavating the inside to form the large-section tunnel 1A.

In FIG. 4, a portion indicated by A is a connecting position between the small-section shield tunnels 1a, and a connecting operation is performed in this portion using a hinge structure segment 12 described later.

FIG. 1 shows an embodiment of the present invention, in which the sectional shape of the small-section shield tunnel 1a is rectangular.

In the figure, the black circles indicate the hinges 13, and the white circles indicate the joints 15 formed by welding or mechanical joining at the site.

In this embodiment, a hinge structure segment 12 which is bent at a right angle at a hinge 13 is used as a segment of the upper and lower corners constituting the right small-section shield tunnel 1a in the figure.

When the small-section shield tunnel 1a is constructed by the shield machine, the hinge structure segment 12 is closed (bent at a right angle) and fixed with temporary bolts or the like so that the hinge 13 is not opened.

When connecting to the adjacent small-section shield tunnel 1a, a temporary bolt or the like to which the hinge 13 is fixed is removed, and the upper and lower plate-like segments 11 constituting the segment ring are removed from the hinge 13 as a center. Open one side (outward) so that they are almost coplanar. At this time, if there is a possibility of water leakage from the hinge 13 or the like, a waterproof rubber, a water-blocking sheet, or the like is attached to the hinge 13.

The moved end of the hinge structure segment 12 abuts with the other small-section shield tunnel 1a,
The butted portions are connected by welding or mechanical joining.

Each small-section shield tunnel 1a is usually filled with concrete by arranging a reinforcing bar or the like.

FIG. 2 shows another embodiment of the present invention. The basic structure and function of the hinge structure segment 12 are the same as those of the embodiment of FIG. The small-section shield tunnel 1a has a cross-sectional shape in which a rectangular corner is chamfered, and uses a hinge structure segment 12 having a hinge 13 at a chamfering start position.

In this embodiment, the small-section shield tunnel 1
After construction a, the hinge structure segments 12 facing each other at the connection position are opened at the hinge 13 so that they are substantially flush with the upper and lower plate-like segments 11, and the butted ends are connected by welding or mechanical joining. .

FIG. 3 shows still another embodiment of the present invention, in which the cross section of the small-section shield tunnel 1a is arc-shaped at the connecting position of the tunnels 1a. The hinge structure segment 12 according to the present embodiment has a structure in which a flat plate-shaped portion and an arc-shaped portion are connected by a hinge 13, and in the connection between the small-section shield tunnels 1a, the amount of wasted segments that need to be removed. On the other hand, the amount of excavation at the connection position during connection construction increases.

[0028]

Advantageous Effects of the Invention When connecting small-section shield tunnels, by using a hinge structure segment as a connection position segment, cutting or dismantling of the segment becomes unnecessary, and a part of the hinge structure segment centering on the hinge. Can be spread outward, and the shield tunnels with small cross sections can be integrated as they are by welding or mechanical joining as they are, and construction can be performed safely and efficiently.

When connecting small-section shield tunnels to each other, the amount of segments to be removed is reduced, which is economical.

As described above, safe and economical construction of a large-section tunnel using a small-section shield tunnel becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in a direction perpendicular to a tunnel showing a connection portion between small-section shield tunnels in one embodiment of the present invention.

FIG. 2 is a cross-sectional view in a direction perpendicular to the tunnel showing a connecting portion between small-section shield tunnels according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view in a direction perpendicular to the tunnel showing a connecting portion between small-section shield tunnels according to still another embodiment of the present invention.

FIG. 4 is a cross-sectional view in a direction perpendicular to the tunnel showing an example of the arrangement of a small-section shield tunnel constituting a lining portion of a large-section tunnel.

FIG. 5 is a perspective view showing an outline of a method of constructing a large-section tunnel using a small-section shield method.

[Description of Signs] 1A: large section tunnel, 1a: small section shield tunnel, 2 ... shield machine, 3 ... rear excavation part, 11 ... segment, 11a ... segment to be removed, 12 ... hinge structure segment, 13 ... hinge, 14 Joint, 15 Joint

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/08 E21D 11/14

Claims (5)

(57) [Claims] 1. A method of constructing a plurality of small-section shield tunnels in close proximity, connecting adjacent small-section shield tunnels, and excavating an interior surrounded by the small-section shield tunnels to construct a large-section tunnel. a construction method of a large cross-section tunnels, as a segment in the connecting position of each other adjacent small cross shield tunnel, a segment constituting a part of the segment ring of the small section shield tunnel, longitudinally intermediate of the segment At a position, a hinge having a rotation axis extending in the tunnel axis direction is provided, and a hinge structure segment in which a part of the segment can be opened and closed outside the segment ring around the hinge is used. During the connection, the hinge structure One of the joints in the circumferential direction of the tunnel is removed, the side from which the joint is removed is opened to the outside of the segment ring with the hinge as the center, and the segments at the connection position of the adjacent small-section shield tunnel are joined, and the butted position is joined at the site. A method for constructing a large-section tunnel, wherein the plurality of small-section shield tunnels are integrated with each other. 2. The method for constructing a large-section tunnel according to claim 1, wherein when connecting adjacent small-section shield tunnels, some segments at the connection positions are removed. 3. The method according to claim 1, wherein the cross section of each of the shield tunnels is rectangular. 4. The method for constructing a large-section tunnel according to claim 1, wherein concrete is poured into the small-section shield tunnel after connecting the small-section shield tunnels. 5. A segment constituting a part of a segment ring of a small-section shield tunnel, wherein a hinge having a rotation axis extending in a tunnel axial direction is provided at a middle position in a longitudinal direction of the segment. A part of the segment can be opened and closed outside the segment ring around the hinge, and a segment of a small-section shield tunnel to be constructed adjacently
A hinge structure segment, which is provided as a connection part with a hinge.