JPS6344098A - Method of shield tunnel underground docking construction and shield excavator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for a shield tunnel underground docking method and a shield excavation machine, and more specifically, when constructing a long tunnel in soft ground such as a water-retaining gravel layer. The present invention relates to a shield tunnel underground donking construction method using a shield tunneling machine based on two-point starting, and the shield tunneling machine.

[Prior art]

In general, shield tunneling machines are widely used as the most suitable tunneling machines for constructing tunnels in soft ground such as water-logged gravel layers, and as the excavation progresses, the tunnel is constructed by lining segments at the rear. It is something.

As shown in Fig. 5, this shield tunneling machine has a large number of casso turbine lifts 2 planted in front of a cylindrical outer shell 1, and a cutter wheel 3 having a diameter slightly larger than that of the outer shell 1. The cutter wheel 3 is rotated by a cutter motor 4 to excavate the ground, and the excavated earth and sand is taken out from the outlet 5. Note that 6 is a bulkhead provided to prevent earth and sand from flowing in.

By the way, if the tunnel to be constructed is long,
In order to shorten the construction period, it is possible to launch two shield excavators from both ends of the tunnel and dock them approximately in the center, but in this case, after docking, a complete seal at the docking position is performed to remove the excavated earth. After preventing water, etc. from flowing into the shield tunneling machine, it is necessary to dismantle each shield tunneling machine and take it out of the tunnel.

Conventionally, chemical injection method and freezing method are known as methods for sealing at this docking position.

The former is a method in which a special chemical solution is injected into the surrounding ground after dotting and solidified, but this is a practical problem as it lacks strength and reliability due to the unevenness of the degree of soil improvement after the chemical solution injection. There is.

On the other hand, in the latter method, as shown in Fig. 6, a freezing pipe 7 is extended into the ground, and a refrigerant is supplied from this freezing pipe 7 into the ground to cool and solidify the water in the ground. Not only does it take several months to a year to freeze the tunnel, but when it thaws, the surrounding soil loosens and the tunnel joints become deformed.

[Purpose of the invention]

The present invention has been made in order to solve the problems in connecting the excavated holes when excavating from two points using the conventional shield excavator as described above, and has the object: However, when constructing a tunnel by launching two shield tunneling machines from two points and docking them, it is possible to improve the sealing performance at the docking points.
The aim is to shorten the construction period, prevent changes in strength due to changes in soil quality, etc., and improve reliability and safety.

[Summary of the invention]

The present invention has been made to achieve the above-mentioned object, and is a shield construction method in which two shield excavators are launched from two points and docked at a fixed point.
A hood that can be slid in the front and back direction is provided inside the shield tunneling machine of the platform and in front of the outer shell of at least one of the shield tunneling machines, and when the two shield tunneling machines reach a fixed point, the hood is moved forward. It is an object of the present invention to provide a shield tunnel underground donking construction method in which a shield tunnel is connected to another shield tunneling machine, and a shield tunneling machine used in this method.

What is particularly important about the present invention is that a hood is provided that is continuous with the outer shell of one of the shield tunneling machines and can be moved in and out from the front end of the outer shell of the shield tunneling machine. 2 by protruding the hood
It is significant to form passages to communicate between the holes that have not yet been reached by the outer shell of the shield machine.

This hood fits into the inner surface of the outer shell and slides inside the outer shell to protrude, forming a cylindrical body. The hood is operated using hydraulic pressure or the like.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shield tunnel underground donking method and a shield excavator using two-point starting according to the present invention will be described below with reference to FIGS. 1 to 4.

In these figures, the same reference numerals as in FIG. 5 indicate the same names. FIG. 1 is a schematic sectional view of the shield tunneling machine, and FIG. 2 is a view taken along the line A--A.

A cylindrical hood 8 is arranged on the front and inner side of the cylindrical outer shell 1 of the shield tunneling machine, and is slidable in the front and rear direction by a hydraulic jack 9.

The cutter wheel 3 has a diameter slightly smaller than the diameter of the hood 8, and a plurality of overcutters 10 are provided on its outer periphery.

This overcutter lO is movable in the radial direction by a hydraulic jack 11.

Specifically, this overcutter 10 is equipped with a hydraulic jack 1.
1, its tip reaches slightly outward from the outer circumference of the outer shell 1, while when retracted, its tip reaches approximately equal to or slightly inward from the outer circumferential surface of the cutter wheel 3. It has become.

To explain the situation in which two shield tunneling machines having the above configuration are launched from two points to excavate a tunnel and dock at a fixed point, first, as shown in FIG. When the shield excavator continues to excavate, the overcutter 10 can excavate another mountain slightly larger than the outer shell 1, so that the shield excavator can easily move forward.

When the shield tunneling machine reaches the predetermined docking position as described above, the hydraulic jack 11 is operated to pull the overcutter 10 into the cutter wheel 3, and then the hydraulic jack 9 moves the hood 8 forward. let me,
Connect to the hood 8' of another shield excavator (3rd
figure).

After confirming the groundwater sealing condition in the chamber 13 through the inspection hole 12 provided in the bulkhead 6, the inside of the shield excavator is dismantled and removed.

In order to further improve the sealing performance of the hood 8, a water-sealing gasket may be provided at the contact area between the hood 8 and the hood 8' as necessary. It is also possible to use a method of making water unlucky.

FIG. 4 shows another embodiment, in which the hood 8 is provided only on one of the two shield tunneling machines, and in this case, when docking, the front edge of the hood 8 is It will be inserted into the outer shell 1' of the shield tunneling machine.

〔Effect of the invention〕

As explained above, according to the method of docking a shield tunneling machine by starting from two points and the shield tunneling machine according to the present invention, the shield tunneling machine can be docked while forming a hole using the hood 8 provided in front of the outer shell 1. Moreover, since it prevents the inflow of earth, sand, or water, not only can the construction period be significantly shortened compared to conventional methods, but there is no change in strength due to soil improvement, which improves reliability and safety. There are effects such as being able to.

[Brief explanation of drawings]

1 to 4 show conventional examples of the shield tunnel underground docking method and shield excavation machine according to the present invention, and FIG. 1 is a schematic side sectional view of the shield excavation machine;
2 is a view taken along the line A--A in FIG. 1, FIG. 3 is an explanatory diagram of docking, and FIG. 4 is an explanatory diagram of docking in another embodiment. 5 and 6 are explanatory diagrams of a conventional example, in which FIG. 5 is a schematic side sectional view of a shield tunneling machine, and FIG. 6 is an explanatory diagram of docking. DESCRIPTION OF SYMBOLS 1... Outer shell, 2... Cutter bit, 3... Cutter wheel, 4... Cutter motor, 5... Outlet, 6... Bulkhead, 7... Freezing tube, 8 ...
Hood, 9.11...Hydraulic jack, 10...Over cutter, 12...Inspection hole, 13...Chamber. 'WF, Figure 5 Figure 6 Figure 2 Figure 1

Claims (2)

[Claims] (1) In a shield tunnel excavation method in which two shield tunneling machines are launched from two points and docked at a fixed point, the front of the outer shell of at least one of the two shield tunneling machines is A hood that can be slid in the front and back direction is provided, and when the two shield tunneling machines reach a fixed point, the hood is moved forward to connect to the other shield tunneling machine or to partially cover the surrounding area. A shield tunnel underground docking method featuring: (2) A hood having a diameter larger than the cutter wheel is attached to the front outer shell of the shield tunneling machine so as to be slidable in the front and rear directions, and a plurality of overcutters that can appear and retract in the radial direction are installed on the outer periphery of the cutter wheel. A shield excavator characterized by the placement of.