JPS6326480Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a shield tunneling machine.

In the shield construction method, if the condition of the excavated ground is known, it is possible to prevent ground movement, that is, accidents. By the way, the condition of the excavated ground can be judged by the amount of excavated earth and sand. Conventionally, in mud water pressurized shield excavators, excavated soil is transported as a slurry, so if the flow velocity is known, the volume can be found by multiplying the cross-sectional area and the flow velocity, and this volume can be multiplied by the density (which is known in advance). The amount of soil movement can be obtained. However, in a shield excavator that carries out excavated soil as plasticized soil, the excavated soil is discharged into a slurry and the weight is determined from the volume of the slurry, but because it is a batch type, it is accurate at that time. The drawback was that the amount of excavated soil could not be measured.

Therefore, an object of the present invention is to provide a shield tunneling machine that can eliminate the above-mentioned drawbacks.

That is, the present invention utilizes a screw conveyor-type discharge system that transports the excavated soil that is taken into a pressure chamber connected to an injection pipe of the plasticization improvement material and that has been plasticized by the plasticization improvement material to the atmospheric pressure chamber side. A space chamber for forming a sand plug is formed in the middle of the cylindrical casing of the soil device, and a magnetic field generating device that generates a magnetic field in a direction perpendicular to the conveyance direction is provided on the outer periphery of the space chamber of the cylindrical casing, and a A voltage detection device is provided to detect the voltage generated in the excavated dirt as a conductor according to the moving speed of the excavated dirt being cut and moved, and the moving speed of the excavated dirt is determined by the voltage detected by the voltage detection device. This shield excavator is characterized in that it is provided with a calculation device that calculates the movement amount of the excavated earth and sand based on the movement speed.

According to this configuration, a magnetic field is applied to the sand plug forming space chamber, and the voltage generated in the excavated soil that crosses this magnetic field is detected and the amount of excavated soil to be moved is calculated, so that the excavation can be carried out moment by moment and accurately. The amount of soil can be known, and therefore, deformation of the ground can be dealt with immediately.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 designates a cutter head which is rotatably supported at the front of the shield body 2 via a bearing 3, and is rotationally driven by a rotary drive device 5 which is interlocked and connected via a ring gear 4 attached to the rear of the cutter head. A pressure chamber 6 for taking in excavated earth and sand is formed inside thereof. Further, an injection pipe 8 for a plasticization improving material (sludge) is connected to the rear partition wall 7 of the pressure chamber 6 to plasticize the excavated earth and sand in the pressure chamber 6. Note that 9 is an earth pressure gauge that detects the pressure inside the pressure chamber 6. Reference numeral 10 denotes an earth removal device for transporting excavated earth and sand in the pressure chamber 6 to the atmospheric pressure chamber 11 side. is rotatably arranged to transfer excavated soil from pressure chamber 6 to atmospheric pressure chamber 1.
1, and a ribbon-shaped screw blade 13 for conveying the material to the main body. This ribbon-shaped screw blade 13 is rotationally driven via a rotating ring 14 fixed to the rear outer periphery. That is, the rotating ring 14 is formed in the annular recess 1 formed near the rear of the cylindrical casing 12.
2a via a bearing 15, a ring gear 16 is attached to the outer periphery of the ring gear 2a, and the ring gear 16 is operatively connected to a rotational drive device 18 via a pinion 17.

A reduced tube portion 12b having a first gate 19 and a second gate 20 at both ends is provided in the middle of the cylindrical casing 12 (further rearward than the rotating ring 14 in this embodiment), and this reduced tube portion Inside 12b is a space chamber 21 for forming a sand plug.
Reference numeral 22 denotes a magnetic field generating device provided above and below the outer periphery of the reduced pipe portion 12b, and is used to generate a magnetic field in the vertical direction within the space chamber 21 and in a direction perpendicular to the conveyance direction of the excavated earth and sand. Therefore, when the excavated earth and sand move within the space chamber 21 due to this magnetic field, a current flows through the excavated earth and a voltage corresponding to the moving speed is generated. In addition, this space chamber 21
The excavated soil in this area is conductive because it is mixed with groundwater and plasticizing materials. Reference numeral 23 denotes a voltage detection device for detecting the voltage generated in the excavated earth and sand in the space chamber 21, and is provided at both sides of the reduced pipe portion 12b. 24 inputs the generated voltage and calculates the moving speed of excavated earth and sand in the space chamber 21, and also calculates the moving speed of the excavated earth and sand in the second gate 20 based on this moving speed.
This calculation device 24 calculates the amount (mass or weight) of excavated earth and sand discharged from the sand plug. It is pre-filled. Reference numeral 25 denotes an output conversion device for displaying a signal of the moving amount of excavated earth and sand calculated by the calculation device 24 on, for example, a meter 26 and a recorder 27. Note that 28 is a pressure gauge (earth pressure gauge, etc.) provided on the inner surface of the reduced pipe portion 12b, and is for detecting the pressure during sand plugging. Also, 2
Reference numeral 9 denotes a belt conveyor for carrying out excavated earth and sand, which is provided behind the cylindrical casing 12.

Next, the operation will be explained.

First, the excavated earth and sand taken into the pressure chamber 6 of the cutter head 1 is mixed and stirred with the plasticization improving material injected from the injection pipe 8, and is plasticized. The sand plug is conveyed to the reduced pipe section 12b, where a sand plug capable of resisting groundwater pressure and collapse soil pressure of the ground is formed. Note that the excavated soil is mixed and stirred with the plasticization improving material even during its transportation.

The pressure of the sand plug can be determined by a pressure gauge 28 provided within the reduced pipe portion 12b. When the sand plug reaches a predetermined pressure, the second gate 20 is opened and the excavated earth and sand is discharged onto the belt conveyor 29. At this time, a magnetic field is applied to the space chamber 21 in the vertical direction, and as the plasticized excavated soil as a conductor crosses this magnetic field, a voltage is generated according to the moving speed, and this voltage is detected by voltage detection. It is detected by the device 23 and sent to the arithmetic device 24. After the moving amount of the excavated earth and sand is accurately calculated in this calculation device 24, it is outputted moment by moment to a meter 26 or a recorder 27 via an output conversion device 25. ). Also,
The pressure inside the pressure chamber 6 can be adjusted by controlling the rotation of the ribbon-shaped screw blade 13 and the first and second gates 19 and 20 using the earth pressure gauge 9. Note that the first gate 19 is normally used during maintenance.

According to the above configuration, a magnetic field is applied to the sand plug forming space chamber, and the voltage generated in the excavated soil that crosses this magnetic field is detected to calculate the amount of excavated soil to be moved. The amount of excavated soil can be known, and therefore deformation of the ground can be dealt with immediately.

[Brief explanation of the drawing]

The drawing is a schematic diagram of an embodiment of the present invention. 1...Katsuta head, 2...Shield body, 6
... Pressure chamber, 7 ... Pressure chamber rear bulkhead, 8 ... Injection pipe, 10 ... Earth removal device, 11 ... Atmospheric pressure chamber, 12
... Cylindrical casing, 12b ... Reducing pipe section, 13
...Ribbon-shaped screw blade, 20...Second gate, 21...Space, 22...Magnetic field generator, 2
3... Voltage detection device, 24... Arithmetic device, 25...
...Output conversion device.

Claims (1)

[Scope of utility model registration request] A cylindrical screw conveyor-type earth removal device that transports excavated soil plasticized by the plasticizing improver to the atmospheric pressure chamber side, which is taken into a pressure chamber to which an injection pipe of the plasticizing improver is connected. During the casing,
A magnetic field generating device that forms a sand plug forming space chamber and generates a magnetic field on the outer periphery of the space chamber of the cylindrical casing in a direction perpendicular to the conveyance direction thereof, and a moving speed of excavated earth and sand that moves across the magnetic field. A voltage detection device is provided to detect the voltage generated in the excavated earth and sand as a conductor according to the voltage detection device, and the moving speed of the excavated earth and sand is calculated based on the voltage detected by the voltage detecting device and based on the moving speed. A shield excavator characterized by being equipped with a calculation device that calculates the amount of movement of excavated earth and sand.