JP2554933B2 - Composite section shield method - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a composite cross-section shield construction method, and more particularly to a construction method for freely joining or branching an adjoining tunnel.

"Problems to be solved by conventional techniques and inventions" Generally, in a subway, a road tunnel, or a tunnel such as a common ditch, a separate single-line tunnel is used as a double eyeglass-type composite section at a station or a junction. In some cases, they may be joined together and branched from this joined portion into a single-line tunnel.

Conventionally, branching and joining of tunnels has been difficult, and in mountain tunnels, etc., KIJI is often constructed by the NATM method. However, this method has a problem in terms of construction period, construction cost, and safety.

Also, in urban tunnels, a shaft is installed at the junction, and the junction is made up of structures such as manholes and box culverts. However, considering the place to install the shaft and the construction cost, it can be smoothly branched and joined by the shield machine. At present, it is desired to do so.

Conventionally, construction methods such as a roof shield and a widening shield have been adopted in road tunnels, subway station sections, and joints of caverns, but the degree of freedom is small, which is a difficulty in designing.

"Means for solving the problem""Firstinvention" A remaining cutter is provided so as to be cut off between adjacent portions of the skin plates of the shield machine which are adjacent to each other.
Further, an arc-shaped remaining skin plate that covers the adjacent portion of the skin plate of the additional shield machine behind the remaining cutter is detachably provided, and a cutout is formed in the skin plate of the additional shield machine below the tail portion of the remaining skin plate. By providing a part, excavating the remaining earth and sand between the additional shield machine by the remaining cutter simultaneously with the excavation by the additional shield machine, by performing a lining that joins and integrates the tunnels by the additional shield machine,
Proposal of a construction method that enables the separated single wire tunnel to be smoothly and economically joined simply by installing the remaining cutter and the remaining skin plate that can be assembled and disassembled between the attached shield machines without constructing a vertical shaft. Is.

[Second invention] After the joint is constructed according to the first invention, the remaining cutter and the remaining skin plate cut off from the skin plate of the shield machine for attachment are left, and the cutouts in the skin plate of the shield machine for attachment are blocked, This method proposes a construction method in which each separated shield machine branches into a single-line tunnel and is excavated so that a separated single-line shield tunnel can be easily constructed following the construction of the joint.

[Embodiment] An embodiment of the present invention shown in the drawings will be described below.

"First invention" Two shield machines, which are installed in close proximity to each other at a small interval 1,
In FIG. 1, the remaining cutter 4 is installed between the adjacent portions of the skin plate 3 behind the cutter face 2.

The remaining cutter 4 may have any structure as long as it can excavate an extremely narrow drum-shaped remaining portion in the middle of the excavated portion by the attached shield machines 1, 1, but for example, if the stratum is relatively soft soil, An arc-shaped grid-shaped or comb-teeth-shaped fixed cutter with a crushing blade is used to crush the upper and lower parts of the drum-shaped remnant and collapse the entire remnant.

An arc-shaped remaining skin plate 5 that covers this portion is connected to the rear side of the remaining cutter 4 and adjacent to the skin plate 3 of the side-by-side shield machine 1, 1 so that it can be cut off.
Cutouts 6 are provided on the skin plates 3 of the side-by-side shield machines 1, 1 below the tails of the remaining skin plates 5 so as to face each other.
3, 3 and the tail part of the remaining skin plate 5 form a double mountain shape and are released in series, and in this part, the lining of a double eyeglass type composite cross section that integrates the tunnel by the shield machine 1, 1 (segment assembly) , Or on-site lining concrete pouring).

When excavating a single-line tunnel by each of the shield machines 1, the notch 6 is blocked by a blocking plate 7.

In this case, the blocking plate 7 may be slidably incorporated in the skin plate 3 in the vicinity of the cutout portion 6, and may be slid to open and close the cutout portion 6 at any time.

After constructing a single-line tunnel by the side-by-side shield machine 1,1 with the above configuration, when joining them to construct a joint, the remaining cutter 4 between the shield machines 1 and 1 and the remaining skin behind it. The plate 5 is installed, and the blocking plate 7 of the cutout 6 is removed and opened.

Then, at the same time as the excavation is performed by the cutter face 2 of the side-by-side shield machine 1,1 and at the same time by the remaining cutter 4, in the series of tail portions of the skin plates 3,3 and the remaining skin plate 5, between the tunnels by the side-by-side shield machines 1,1. The lining of the double-lens type composite cross section in which

[Second Invention] After branching into a single-line tunnel after constructing a joint according to the first invention, the skin plate 3 of the side-by-side shield machine 1,1 to the remaining cutter 4 and the remaining skin plate 5 are used.
And the notch 6 in the skin plate 3 of the side-by-side shield machine 1,1 is closed by the closing plate 7, and then the remaining cutter 4 and the remaining skin plate 5 are left behind, and the advancing shield machine 1,1 is used for digging. Then, the branched single line tunnel 8 is constructed.

In addition, when constructing the single-track tunnel 8, a widening jack is installed between the skin plates 3 and 3 of the side-by-side shield machines 1 and 1 to pressurize the side surfaces of the side-by-side shield machines 1 and 1 and proceed with excavation while expanding the side-by-side spacing. It is also possible.

[Advantages of the Invention] As described above, according to the present invention, the double eyeglass-type composite cross-section shield is changed from the single-line parallel to the single-line parallel or the double-line from the single-line parallel to the subway station and the running tunnel, or the junction and the branch of the road tunnel. Switching to an eyeglass-type compound cross-section shield can be done safely with one shield machine without constructing a vertical shaft, which is difficult due to location and construction costs.

[Brief description of drawings]

FIG. 1 is a front view of a composite cross-section shield machine used in the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a plan view showing a single-line construction of the shield machine used in the present invention, and FIG. Fig. 5 (a), (b)
FIG. 3 is a front view showing a tunnel having a composite cross section and a single wire constructed according to the present invention. 1 ... Side-by-side shield machine, 2 ... Cutter face, 3 ...
... Skin plate, 4 ... remaining cutter, 5 ... remaining skin plate, 6 ... notch, 7 ... blocking plate, 8
...... Single-track tunnel.

 ─────────────────────────────────────────────────── ─── Continuation of front page (73) Patent holder 999999999 Nippon Shield Engineering Co., Ltd. 2-6-2 Otemachi, Chiyoda-ku, Tokyo (73) Patent holder 999999999 Nippon Steel Corporation Otemachi, Chiyoda-ku, Tokyo 2-6-3 (72) Inventor Koji Hoshino 2-6-6 Haneki, Setagaya-ku, Tokyo (72) Inventor Shigeki Kitagawa 866-74 Higashiarai, Omiya-shi, Saitama (56) Reference JP-A-2-153196 (JP, A)

Claims (2)

(57) [Claims] 1. A remaining cutter is provided so as to be cut off between adjacent portions of skin plates of a shield machine that are adjacent to each other, and a portion of the skin plate adjacent to the skin plate of the adjacent shield machine is provided behind the remaining cutter. An arc-shaped remaining skin plate for covering is detachably provided, and a cutout is provided in the skin plate of the attached shield machine below the tail portion of the remaining skin plate, and the attached shield is provided by the remaining cutter simultaneously with the excavation by the attached shield machine. A composite cross-section shield construction method characterized by excavating the remaining sediment between machines and joining and lining the tunnel by the above-mentioned shield machine. 2. A remaining cutter is provided so as to be cut off between adjacent portions of skin plates of a shield machine which are adjacent to each other, and a portion of the skin plate adjacent to the skin plate of the shield machine is provided behind the remaining cutter. An arc-shaped remaining skin plate for covering is detachably provided, and a cutout is provided in the skin plate of the attached shield machine below the tail portion of the remaining skin plate, and the attached shield is provided by the remaining cutter simultaneously with the excavation by the attached shield machine. Excavating the remaining sediment between the machines, after performing a lining that joins and integrates the tunnels by the additional shield machine, leaving the remaining cutter plate cut off from the skin plate of the additional shield machine and the remaining skin plate,
A composite cross-section shield construction method, characterized in that a notch portion in a skin plate of the adjoining shield machine is blocked, and then a single-line tunnel is branched and excavated by each of the adjoining shield machines.