JPH0842282A - Turning method and device of shield machine - Google Patents

Abstract

PURPOSE:To make it possible to turn a shield machine with a little operation force. CONSTITUTION:A shield machine 1 having reached a vertical shaft 2 while excavating a shield tunnel 3 is placed on a holder provided on an operation floor 5 in the vertical shaft 2, and in a method setting the shield machine 1 in a separate direction by turning the holder, a floating device 8 for supporting the holder with fluid pressure is provided in the lower part thereof. A pressure room 16 is formed in the internal circumference of a bag 10 while expanding it by applying fluid pressure to the inside of the expansible ring-shaped bag 10 provided to the lower part of the floating device and the internal circumference of the bag. The holder is lifted up with expansion pressure of the bag 10 and pressure of the pressure room 16, and coefficient of friction against the floor surface is decreased by fluid spread to the circumference from the contact surface between the bag 10 and floor surface of the operation floor 5 through the pressure room 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine direction changing method and apparatus capable of changing direction in a labor-saving manner.

[0002]

2. Description of the Related Art In general, a shield machine is a machine for excavating a tunnel in a straight line, and although it has a function of changing direction for a large curvature, it is difficult to make a sharp turn. So, for example, when there is a sharp bend in the planned waterway, such as excavation work for a shield pit for underground water and sewerage,
The intermediate shaft is excavated in advance at the direction changing position during the excavation, and the shield machine reaching the inside of the shaft is received on the pedestal installed on the work floor, and the direction of the pedestal is changed for each pedestal. There is.

As this conversion method, a lubricant such as grease is put between the pedestal and the work floor door, and the chain block,
Either using jacks or the like, the direction change work was performed while sliding, or a dedicated turntable or slide table was manufactured and these were used for the direction change work.

[0004]

However, whichever method is used, a large amount of power is required to change the direction, which is dangerous because it is a work for changing the direction in a narrow space. Further, when a dedicated device is used, there is a problem that its manufacturing cost becomes high.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a direction changing method of a shield machine which can change the direction with a small operating force.

Another object of the present invention is to provide a conversion device suitable for the above conversion method.

[0007]

In order to achieve the above object, in the direction changing method of the shield machine according to the present invention, the work of excavating the shield pit and arranging the shield machine reaching the pit on the pit In a method of installing the shield machine in a different direction by setting it on a pedestal placed on the floor and changing the direction of the pedestal, fluid levitation means is provided on the lower surface of the pedestal, and the levitation means Direction of the shield machine, characterized in that the pedestal is lifted by driving the pedestal, and the coefficient of friction with respect to the floor surface is reduced by the fluid blown out from the contact surface between the levitation means and the floor surface of the working floor. The conversion method is the gist.

Further, a turning device suitable for the method of the present invention is one in which a levitation device is provided on a lower surface of a pedestal on which a shield machine is installed, and the levitation device is mounted on a lower surface of the pedestal. A plate, a ring-shaped bag integrally provided on the lower surface of the mount plate, a pipe communicating with the inside and the inner circumference of the bag, and a fluid pumping means connected to the pipe. Is.

[0009]

According to the direction changing method of the present invention having the above-mentioned structure, a film of a fluid flowing between the levitation means and the floor surface is formed, and the friction coefficient of the contact surface is significantly reduced. Even if there is human power or a small amount of power equivalent to this, it is possible to change direction freely.

Further, according to the direction changing device used in the present invention, since only the levitation device is arranged on the lower surface of the pedestal supporting the shield machine, the structure is simple and the assembling and disassembling can be easily performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1A and 1B are sectional views showing a direction changing method of a shield machine according to the present invention, and FIG.
(A)-(d) is a plane explanatory view.

In the figure, 1 is a cylindrical shield machine, and 2 is an intermediate shaft having a rectangular cross section which the shield machine 1 reaches. In this embodiment, when the shield machine 1 penetrates through the existing shield pit 3 to reach the inside of the intermediate shaft 2, the direction is changed by 90 ° at the intermediate shaft 2 and the excavation tip is directed to the new shield shaft 4 to start. Shows the intermediate shaft 2
The cross-sectional area of is formed to be wide enough to change the direction of the shield machine 1.

At the bottom of the hole of the intermediate shaft 2, a work floor 5 is laid on one side without a gap and kept horizontal, and a pedestal 6 is provided above it.
The shield machine 1 that has been installed and has penetrated the existing shield pit 3 is delivered to the pedestal 6.

The pedestal 6 is composed of a large number of H-shaped steels 6a in a double-tiered framework, and the height of the pedestal 6 is different from that of the existing shield shaft 3
Match the bottom of.

Further, a pair of guide rails 7 for supporting both sides of the shield machine 1 are provided on the upper side of the upper H-section steel 6a so as to be orthogonal thereto, and the rolling of the shield machine 1 is prevented.

Further, a notch 6b is formed at the lower edge of the lower H-section steel 6a, and four levitation devices 8 are connected and arranged in the notch 6b.

The levitation device 8 reduces the frictional force by utilizing the elasticity of air and is shown in FIGS.
As shown in (c), the mount plate 9 arranged in the notch 6, the inflatable / contractible ring-shaped bag 10 integrally provided on the lower surface of the mount plate 9, and the inner periphery of the bag 10. And a support pad 11 that is fixed to the lower surface of the mount plate 9 and supports the mount plate 9 when the bag 10 is contracted, and a pipe 12 that is drawn from one end of the mount plate 9 and communicates with the inside of the bag 10 and the inner circumference thereof. And the pipe 12 is a high pressure hose 1
High pressure air supply device 15 such as an air compressor through 4
Connected to

In the levitation device 8, the feeding device 15
When stopped, the bag 10 is contracted into a flat shape as shown in (a), and the mount plate 9 is supported by the support pad 11.

When the supply device 15 is driven from this state and high-pressure air is sent to the inside of the bag 10 and its inner peripheral portion,
As shown in (b), the bag 10 swells under the load,
The work pad 5 is inflated while being in contact with the floor surface, and the support pad 11 is lifted by the high-pressure air supplied to the inner circumference thereof, forming a pressure chamber 16 between the work pad 5 and the inner circumference of the bag 10. .

When the high-pressure air is further sent, the pressure air in the pressure chamber 16 is blown out evenly from between the bag 10 and the work floor 5 to the periphery thereof, and a boundary air film is formed between the pressure air and the floor surface. And the coefficient of friction is significantly reduced,
Specifically, since the friction coefficient is extremely reduced to about 0.003, even a large load can be moved by applying a small lateral force.

Therefore, as shown in FIG. 2A, the shield machine 1 is pierced through the existing shield pit 3 and placed on the pedestal 6.
In the state in which it is delivered, the levitation device 8 is driven to be movable, and after moving to the conversion position as shown in (b), it is rotated 90 ° as shown in (c), and (d). As shown in, the cutting edge of the shield machine 1 is set to face the new shield pit 4. After this position is accurately determined, the levitation device 8 is stopped to land the pedestal 6 on the work floor 5 and the vehicle can start toward the new shield pit 4.

The above-mentioned work can be carried out manually or by a small force equivalent thereto, and the direction changing work can be carried out easily and safely in a narrow vertical shaft.

At the time of starting work, as shown in FIG. 1 (a), the extension rails 7'which are continuous with the guide rails 7 for supporting both sides of the shield machine 1 are arranged toward the shield pit 4 and the shield pit 4 is provided. By disposing a reaction force receiving base (not shown) in the rear part of the machine 1 and driving a hydraulic jack built in the shield machine 1, the shield machine 1 again performs a digging operation toward a new shield pit 4.

After the start operation is completed, the framework of the pedestal 6 is disassembled, and the levitation device 8 is removed, so that it can be removed from the vertical shaft 2 in a disassembled state, and can be diverted for redirection by reassembling at another place.

Although air pressure was used as the levitation fluid in the embodiment, it goes without saying that other fluids such as water can also be used.

[0026]

As described above in detail with reference to the embodiments, in the method for changing the direction of the shield machine according to the present invention, a film of a fluid flowing between the levitation means and the floor surface is generated to bring the contact surface into contact. Has a significantly smaller friction coefficient, and even a heavy-weight shield machine can change its direction freely with a human power or a small force equivalent to this, so it is labor-saving and safe in changing the direction in a narrow shaft. There is an advantage that can be.

Further, according to the direction changing device used in the present invention, since only the levitation device is arranged on the lower surface of the pedestal for supporting the shield machine, the structure is simple and the assembling and disassembling can be performed easily. It has the advantages of being inexpensive and simplifying the work of loading and unloading into the shaft.

[Brief description of drawings]

FIG. 1A is a side sectional view showing an embodiment of a direction changing method for a shield machine according to the present invention. (B) is the same cross-sectional view.

2A to 2D are plan sectional views showing the procedure of the conversion method.

3 (a) to 3 (c) are explanatory views showing only the levitation device used in the conversion method according to this embodiment in an enlarged manner.

[Explanation of symbols]

 1 shield machine 2 intermediate shaft 3 existing shield shaft 4 new shield shaft 5 working floor 6 pedestal 8 flotation device 9 mount plate 10 ring-shaped bag 12 pipe 15 high pressure air supply device 16 pressure chamber

Front Page Continuation (72) Inventor Tetsuaki Katayama 1-10-19 Higashisakura, Higashi-ku, Nagoya-shi, Aichi Obayashi Corporation Nagoya Branch (72) Inventor Shigeki Isomura 1-10-19 Higashi-sakura, Higashi-ku, Nagoya, Aichi Obayashi Nagoya Corporation Branch office (72) Inventor Hisao Kubo 1-10-19 Higashisakura, Higashi-ku, Nagoya-shi, Aichi Obayashi Corporation Nagoya branch

Claims (2)

[Claims] 1. A shield machine, which has reached a vertical shaft while excavating a shield shaft, is installed on a pedestal arranged on a work floor provided on the vertical shaft, and the shield machine is turned in another direction by changing the direction of the pedestal. In the method of setting the pedestal toward the bottom, fluid pressure levitation means is provided on the lower surface of the pedestal, the pedestal is lifted by driving the levitation means, and the contact surface between the levitation means and the floor surface of the working floor. A method of changing the direction of a shield machine, which comprises reducing the coefficient of friction with respect to the floor surface by a fluid blown from the surroundings. 2. A levitation device is provided on a lower surface of a pedestal on which a shield machine is installed, and the levitation device is integrally mounted on a lower surface of the mount plate and a mount plate arranged on the lower surface of the pedestal. A ring-shaped bag provided in, and a pipe communicating with the inside and the inner circumference of the bag,
A direction changing device for a shield machine, comprising: a fluid pressure feeding means connected to the pipe.