JPS5923832Y2 - shield tunneling machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shield excavator, and its purpose is to provide a shield excavator that has a simple structure and is particularly advantageous for excavating a small diameter face.

With a shield excavator, pressure is applied to the face to prevent it from collapsing, and while the pressure is held, the cutter device is rotated to excavate the ground, and the excavated soil that has been removed is removed from the face by the earth removal device. It is discharged to the outside of the holding pressure chamber.

Conventionally, in this type of shield excavator, the operation of the cutter device and the earth removal device were performed by separate drive devices, so it was necessary to secure space for installing them inside the shield body. However, the structure had the disadvantage of being complicated.

For this reason, in a small shield excavator that excavates a small-diameter face, it is inevitable that the arrangement of each mechanical element will be difficult, and improvements have been desired.

The present invention has been devised in view of the above, and aims to simplify the structure by allowing the cutter device and the earth removal device to be operated by a common drive source in a shield excavation machine, thereby making it possible to reduce the size of the shield excavation machine. The design is such that the arrangement of each mechanical element does not become unreasonable even when the machine is in use.

Examples of the present invention will be described below.

Reference numeral 1 denotes a shield body, a cutter device 2 is disposed at the front end of the shield body, and an earth removal device 3 is disposed behind the cutter device 2.

In this embodiment, the earth removal device 3 maintains the earth pressure of the excavated earth acting on the face appropriately by forming a sand plug to prevent the face from collapsing, and also transfers the excavated earth to atmospheric pressure. Since a screw set soil discharge device that can be discharged and released to the side is employed, this will be referred to as a screw discharger 3 in the following description.

The cutter device 2 has a cutting blade 5 provided on the front surface of a cutter head 4, and a surrounding member 6 is integrally provided on the back portion of the cutter device 2, and a pressure chamber 7 is formed inside the surrounding member 6.

The surrounding member 6 is rotatably supported in the axial direction and radial direction by a bearing 9 and a shield body 10 provided between the support member 8 on the shield body 1 side and the front end of the shield body 1. There is also a rotating packet 11 inside it.
have.

Reference numeral 12 denotes a cylindrical casing that is provided through the partition wall 6A of the surrounding member 6 and has an excavated soil intake port 12A opened in the pressure chamber 7, and is supported by the support post 13 and has a rear end portion. A cover unit 14 is extended thereto.

A screw shaft 15 is inserted through the cylindrical casing 12, and the base of the screw shaft 15 is inserted into the cover integrally 14.
It is connected and supported to the output shaft of a rotary drive device 16 attached to the rotary drive device 16.

On the other hand, the screw shaft 15 is provided with a tip flange 17, and by bolting the tip flange 17 to a flange 18 fixed to cJ, @V4 in the back surface of the cutter device 2, the screw shaft 15 and a cutter device 2 are integrally connected.

Reference numeral 19 indicates the outer peripheral surface of the cylindrical casing 12 and the partition wall portion 6A.
This is a gasket placed between the inner peripheral edge of the

The screw shaft 15 has screw blades 2 in its front half.
0 is provided, and a sheath pipe 21 is externally fitted in the rear half, and a part of this sheath pipe 21 is connected to the cylindrical casing 12.
It is designed so that it is fitted in the inside.

A cone valve 22 that is slidable in the axial direction of the sheath pipe 21 is fitted onto the outer surface of the sheath pipe 21. A power device 23 consisting of a lever 23A and a cylinder device 23B is connected to the cone valve 22. The cylindrical casing 1
The excavated earth and sand discharge port 12B of No. 2 is pressed with a required pressure.

In the above, when the rotary drive device 16 is operated, the screw shaft 15 and the cutter device 2 are rotated simultaneously, and the earth is excavated.

After the excavated earth and sand are taken into the pressure chamber 7, the rotary packet 1
1, enters into the cylindrical casing 12 from the excavated soil intake port 12A, and further is scooped up by the screw blade 20.
is transferred to the excavated soil discharge port 12B side.

At this time, the excavated soil discharge port 12B is closed by the cone valve 22 under the required pressure, so the excavated soil transferred to the vicinity of the discharge port 12B is transferred between the discharge port 12B and the terminal end of the screw blade 20. Stagnant.

As the transfer continues, the excavated soil is compacted in the area where it is stagnant, so that a sand plug S is formed in this area, that is, near the outer periphery of the sheath pipe 21.

Along with this, the pressure chamber 7 is filled with the excavated earth and sand that is successively taken in, and the upper pressure thereof comes to act on the face, so that the face is maintained in a state where stable excavation can be performed.

When the excavated soil transfer by the screw blade 20 continues, the transfer pressure exceeds the biasing force of the cone valve 22, and the cone valve 22 retreats by an amount commensurate with the difference, and the excavated soil discharge port 12B It will be released.

With the opening of the excavated soil discharge port 12B, a portion of the excavated soil that has formed the sand plug S up to now is discharged to the atmospheric pressure side.

At this time, since the subsequent excavated earth and sand sequentially form a sand plug S, the earth and sand inside the pressure chamber 7 is properly maintained even while the sand plug S is being discharged.

The excavated earth and sand discharged from the excavated earth and sand discharge port 12B are then carried out by the conveyor device 24.

The shield body 1 is propelled by a propulsion cylinder device 25.
The lined fume pipe 27 is pressed through the press ring 26, and the reaction force is used to press the lined fume pipe 27.
You can also do this by pressing 7.

According to this embodiment, since the sheath tube 21 is fitted onto the screw shaft 15 in the portion where the sand plug S is formed, the screw shaft 15 rotates without contacting the sand plug S.

Therefore, the power of the rotary drive device 16 can be prevented from being wasted due to friction between the two, and the power can be effectively used for earth excavation by the cutter device 2 and earth and sand transfer by the screw charger 3. .

Further, wear of the screw shaft 15 can also be prevented.

The above is the cutter device 2 and screw discharger 3.
Although we have described a type of shield excavator in which the shield main body 1 and the shield main body 1 are provided concentrically, it is possible to install the cutter device 2 and the screw discharger 3 at an angle with respect to the shield main body 1 without changing the structure of the cutter device 2 and the screw discharger 3 at all. It can also be provided.

FIG. 2 shows this case.

In FIG. 2, for convenience of explanation, the same elements as those shown in FIG. 1 are given the same numbers, and their explanations are omitted.

As is clear from the above description of the embodiments, according to the present invention, the cutter device is connected to the screw shaft of the screw set earth removal device, so the cutter device and the earth removal device each have separate drive devices. Since there is no need to provide one, the mechanical structure of the shield excavator can be simplified.

Therefore, the present invention can be particularly advantageously applied to small-sized shield excavators that have a narrow installation space for mechanical elements and do not require large amounts of power for digging.

Furthermore, since the sheath pipe is fitted externally to the rear of the screw shaft of the earth removal device, when a sand plug is formed near the rear of the screw shaft, the screw shaft does not come into contact with the sand plug, which prevents loss of power. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, and FIG.
The figure is a longitudinal sectional side view of a modified example. 2... Cutter device, 3... Screw charger (earth removal device), 7... Pressure chamber, 16... Rotation drive device, 17.18 ...
...7 lunges.

Claims (1)

[Scope of utility model registration request] The cutter device is connected to the tip of the screw shaft of a screw set earth removal device that discharges excavated earth and sand to the outside of the pressure chamber, and a sheath pipe is fitted onto the rear of the screw shaft, and its axis is centered on the sheath pipe. A cone valve that can be slid in any direction is fitted onto the outside, and the cone valve is pressed against the excavated soil discharge port of the earth removal device with a predetermined force to form a sand plug on the outer periphery of the sheath pipe inside the earth removal device. A shield excavator characterized by being equipped with a power device for forming a shield.