Method for preventing shield casing jamming due to too large frictional resistance in earth pressure balance shield machine
US9016983B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2011 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Jun 9, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for preventing shield jamming by excessive frictional resistance in earth pressure balance shield which involves real-time monitoring of earth pressure signal for earth pressure on the shield body through sensors on the shield machine. Combined with the known parameters, resistance in the shield machine is calculated. The friction F1 between the shield body and the stratum is calculated by CPU module in PLC according to the earth pressure signals on a real-time basis. Then the friction F1 is determined whether it is less than or equal to the difference between the quotient of dividing total propulsion force Ft by correction coefficient Kxz and total resistance of F2, F3, F4 and F5; if so, it is under normal propulsion; if not, the warning device alarms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.