Method for diagnosing cutter head blockage

Abstract

To diagnose the blockage status of the soil passage area in a simple manner while keeping costs down. [Solution] The method for diagnosing the blockage state of a cutter head is a method for diagnosing the blockage state of a cutter head in a tunnel boring machine, wherein the tunnel boring machine comprises a cylindrical boring machine body, a plurality of cutter spokes arranged radially, a plurality of soil passage sections between the plurality of cutter spokes, a cutter head rotatably provided at the front end of the boring machine body, and at least one drive device for rotationally driving the cutter head, and the diagnostic method includes an acquisition step of acquiring the torque of the drive device when the cutter head is rotationally driven by the drive device in a state where no excavation is being performed, and a diagnostic step of diagnosing the blockage state, which is the state of blockage of the soil passage section due to excavated soil, based on the torque change.

Claims

1. A method for diagnosing the blockage state of the cutter head in a tunnel boring machine, The aforementioned tunnel boring machine, A cylindrical excavator body, A cutter head rotatably mounted at the front end of the excavator body, having a plurality of cutter spokes arranged radially and a plurality of soil passage sections between the plurality of cutter spokes, At least one drive device for rotationally driving the cutter head, Equipped with, The aforementioned diagnostic method is, An acquisition step to acquire the torque changes of the drive device when the cutter head is rotated by the drive device in a state where no drilling is performed, A diagnostic step is performed to diagnose the blockage state, which is the state of blockage in the soil passage section due to excavated soil, based on the torque changes. including, A method for diagnosing cutter head blockage.

2. In the diagnostic step, it is determined whether the blockage occurs at a position biased towards the circumferential direction of the cutter spoke. A method for diagnosing the blockage state of a cutter head according to claim 1.

3. In the diagnostic process, if it is determined that the blockage occurs at a location biased in the circumferential direction of the cutter spoke, the location of the blockage in the circumferential direction of the cutter spoke is detected as the blockage state. A method for diagnosing the blockage state of a cutter head according to claim 2.

4. The tunnel boring machine is equipped with a plurality of the aforementioned drive devices, If the diagnostic step does not determine that the blockage is occurring at a position biased in the circumferential direction of the cutter spoke, the number of drive units of the drive device is reduced compared to the previous acquisition step, and the acquisition step is repeated. Based on the torque changes obtained in the repeated acquisition step, the diagnostic step is repeated. A method for diagnosing the blockage state of a cutter head according to claim 2 or 3.

5. The tunnel boring machine is equipped with a plurality of the aforementioned drive devices, In the acquisition process, the cutter head is rotationally driven by some of the drive devices among the plurality of drive devices. A method for diagnosing the blockage state of a cutter head according to any one of claims 1 to 3.

6. In the acquisition step, the torque change is acquired when the cutter head is rotated by the drive device at least one full rotation. A method for diagnosing the blockage state of a cutter head according to any one of claims 1 to 3.

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