JP3001083B2 - Method and apparatus for changing direction of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, a shield machine excavates a tunnel in a straight line, and although it has a function of turning a large curvature, it is difficult to make a sharp turn. Therefore, when there is a sharp curve in the planned channel, for example, when excavating underground water and sewer shield tunnels,
An intermediate shaft is excavated in advance at the direction change position during excavation, the shield machine that has reached the shaft is received on a pedestal installed on the work floor, and the gantry is turned around. I have.

[0003] As this conversion method, lubricating material such as grease is inserted between the receiving stand and the work floor door, and the chain block,
The direction change work was performed while sliding using a jack or the like, or a dedicated turntable and slide table were manufactured, and the direction change work was performed using these.

[0004]

However, any of these methods requires a large amount of power to change the direction, and involves a risk because the direction is changed in a narrow space. Further, when a dedicated device is used, there is a problem that the manufacturing cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a direction changing method of a shield machine capable of changing directions with a small operation force.

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

[0007]

In order to achieve the above object, in a method for changing the direction of a shield machine according to the present invention, an operation is provided in which a shield machine that reaches a shaft while excavating the shield shaft is provided in the shaft. In a method of setting the shield machine in another direction by installing on a pedestal arranged on the floor and changing the direction of the pedestal, a fluid pressure levitation means is provided on a lower surface of the pedestal, and the levitation means is provided. The direction of the shield machine characterized by raising the pedestal by driving the levitation means, and reducing the coefficient of friction with respect to the floor surface by the fluid blown out from the contact surface between the levitation means and the floor surface of the work floor. Conversion method.

In a preferred embodiment of the present invention, the deflecting device comprises a levitation device provided on a lower surface of a pedestal on which the 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 periphery of the bag, and a fluid pumping means connected to the pipe. It is.

[0009]

According to the direction changing method of the present invention having the above-described structure, a film of fluid flowing between the levitation means and the floor surface is generated, and the friction coefficient of the contact surface is significantly reduced. Even if it is, the direction can be freely changed with human power or a small power equivalent thereto.

Further, according to the direction changing device used in the present invention, since the levitation device is simply arranged on the lower surface of the receiving table supporting the shield machine, the structure is simple and assembly and disassembly 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. 1 (a) and 1 (b) are sectional views showing a direction changing method of a shield machine according to the present invention, and FIG.
(A)-(d) is the same plane explanatory view.

In FIG. 1, reference numeral 1 denotes a cylindrical shield machine, and reference numeral 2 denotes an intermediate shaft having a rectangular cross section which the shield machine 1 has reached. In this embodiment, a case where the shield machine 1 penetrates the existing shield shaft 3 to reach the intermediate shaft 2, turns 90 ° in the intermediate shaft 2, and starts the excavation tip toward the new shield shaft 4. Shows that the shaft 2
Is formed in an area where the direction of the shield machine 1 can be changed.

A work floor 5 is laid on the entire surface of the middle shaft 2 at the bottom of the hole without any gap to keep the work floor 5 horizontal.
Is disposed, and the shield machine 1 that has penetrated the existing shield pit 3 is delivered to the receiving stand 6.

The cradle 6 is formed by arranging a large number of H-shaped steel members 6a in two steps in a cross-girder shape.
Match the bottom of the.

A pair of guide rails 7 are provided on the upper side of the upper H-section steel 6a to support both sides of the shield machine 1 at right angles to the H-section steel 6a to prevent the shield machine 1 from rolling.

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 inside 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), a mount plate 9 disposed in the notch 6, an inflatable and contractible ring-shaped bag 10 integrally provided on the lower surface of the mount plate 9, and an inner periphery of the bag 10 are provided. A support pad 11 fixed to the lower surface of the mount plate 9 to support the mount plate 9 when the bag 10 is contracted, and a pipe 12 pulled out from one end of the mount plate 9 and communicating with the inside of the bag 10 and the inner periphery 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 flotation device 8, the supply device 15
When the operation is stopped, the bag 10 is contracted and flattened as shown in FIG.

In this state, when the supply device 15 is driven to send high-pressure air into the bag 10 and the inner peripheral portion thereof,
As shown in (b), the bag 10 swells under the load,
The support pad 11 is inflated while being in contact with the floor surface of the work floor 5, and is lifted by the high-pressure air supplied to the inner periphery thereof, thereby forming a pressure chamber 16 on the inner periphery of the bag 10 and the work floor 5. .

When the high-pressure air is further supplied, the pressure air in the pressure chamber 16 is uniformly blown out from the space between the bag 10 and the work floor 5 to the periphery thereof. 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 transferred, the levitation device 8 is driven to be movable, moved to the turning position as shown in (b), and then rotated 90 ° as shown in (c), and (d) As shown in (2), the cutting blade of the shield machine 1 is set to face a new shield shaft 4. After this position is accurately determined, the levitation device 8 is stopped, so that the cradle 6 lands on the work floor 5, and the vehicle can be started toward a new shield shaft 4.

The above operation can be performed by human power or a small force equivalent thereto, and the turning operation in a narrow shaft can be easily and safely performed.

In the starting operation, as shown in FIG. 1 (a), an extension rail 7 'continuous with a guide rail 7 supporting both sides of the shield machine 1 is arranged toward the shield shaft 4, and the shield machine is shielded. By arranging a reaction force receiving table (not shown) at the rear of the machine 1 and driving a hydraulic jack built in the shield machine 1, the shield machine 1 performs a digging operation again toward a new shield shaft 4.

After the starting operation is completed, the frame of the receiving table 6 is released, and the levitation device 8 is removed. The levitation device 8 can be removed from the shaft 2 in a disassembled state, and can be diverted for redirection by reassembling at another place.

In the embodiment, air pressure is used as a fluid for floating, but it is needless to say that water and other fluids can be used.

[0026]

As described in detail in the above embodiments, in the direction changing method of the shield machine according to the present invention, a film of fluid flowing between the levitation means and the floor surface is formed and the contact surface is formed. The friction coefficient of the shaft becomes extremely small, and even a heavy-weight shield machine can freely change its direction with human power or a small force equivalent to it, making labor-saving and safe turning work in a narrow shaft. There are advantages that can be.

Further, according to the direction changing device used in the present invention, since the levitation device is simply arranged on the lower surface of the cradle supporting the shield machine, the structure is simple and the assembling and disassembling can be easily performed. There are advantages such as being inexpensive and simplifying loading and unloading operations into the shaft.

[Brief description of the drawings]

FIG. 1A is a side sectional view showing one embodiment of a direction changing method of a shield machine of the present invention. (B) is the same front sectional view.

2 (a) to 2 (d) are plan sectional views showing procedures of the conversion method.

FIGS. 3 (a) to 3 (c) are enlarged explanatory views showing only a flotation device used in the conversion method according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 2 Intermediate shaft 3 Existing shield pit 4 New shield pit 5 Work floor 6 Cradle 8 Levitation device 9 Mount plate 10 Ring bag 12 Pipe 15 High pressure air supply device 16 Pressure chamber

Continued on the front page (72) Inventor Tetsuaki Katayama 1-10-19 Higashisakura, Higashi-ku, Nagoya City, Aichi Prefecture Obayashi Gumi Nagoya Branch (72) Inventor Shigeki Isomura 1-10-19 Higashisakura, Higashi-ku, Nagoya City, Aichi Prefecture Obayashi Gumi Nagoya Branch (72) Inventor Hisao Kubo 1-10-19 Higashisakura, Higashi-ku, Nagoya City, Aichi Prefecture Obayashi Gumi Nagoya Branch (56) References JP-A-5-44390 (JP, A) Special Publication Sho53- 45593 (JP, B2) JP 2-31198 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301 B65G 7/06

Claims (2)

(57) [Claims] 1. A shield machine that has reached a shaft while excavating a shield shaft is installed on a pedestal disposed on a work floor provided in the shaft, and the cradle is turned in another direction by turning the cradle. In a method of setting the receiving surface, a fluid pressure levitation means is provided on a lower surface of the pedestal, and the levitation means is driven to lift the pedestal, and a contact surface between the levitation means and a floor surface of the work floor. A method of changing the direction of a shield machine, characterized in that a coefficient of friction with respect to the floor surface is reduced by a fluid blown out from the floor to the surroundings. 2. A levitation device is provided on a lower surface of a pedestal on which a shield machine is installed. The levitation device is integrated with a mount plate disposed on a lower surface of the pedestal and a lower surface of the mount plate. A ring-shaped bag provided in the bag, a pipe communicating with the inside of the bag and the inner periphery thereof,
A direction changing device for a shield machine, comprising: a fluid pumping means connected to the pipe.