Comprehensive early warning device and working method for tail shield sealing system of shield machine

Abstract

The invention provides a shield tunneling machine tail shield sealing system comprehensive early-warning device and a working method thereof. The device comprises a tail shield. The tail shield is connected with a pipe piece through a tail shield brush, and a tail brush cavity is formed between the tail shield, and the tail shield brush and the pipe piece. A shield shell pressure monitoring unit is arranged on a shield shell. An upper computer is connected with a shield tunneling machine guide system. A tail shield gap monitoring unit is arranged on the tail shield. A tail brush cavity pressure monitoring unit is arranged in the tail brush cavity. The shield shell pressure monitoring unit, the tail shield gap monitoring unit and the tail brush cavity pressure monitoring unit are connectedwith the upper computer. According to the shield tunneling machine tail shield sealing system comprehensive early-warning device and the working method thereof, multidirectional data including pressure in the tail brush cavity, shield shell soil pressure, a tail shield gap and a shield posture are acquired, multiple parameters are coupled for judging the tail shield sealing state jointly, the early-warning accuracy is improved, in addition, the sealing safety grades in any positions of multiple grease cavities in the tail shield in the circumferential direction can be displayed visibly throughthe upper computer, and working staff can observe the sealing safety grades directly.

Description

technical field [0001] The invention relates to the technical field of early warning of tail shield sealing of a shield machine, in particular to a comprehensive early warning device for a tail shield sealing system of a shield machine and a working method thereof. Background technique [0002] With the continuous development of urban infrastructure at home and abroad, full-face tunnel boring machines have been used more and more widely as an absolute weapon for tunnel excavation. Accompanying it is the continuous improvement of the safe use of equipment. After all, the shield machine needs to work continuously for a long period of time underground or at a depth of tens of meters underwater. For example, the large-scale subsidence accident of Foshan Metro Line 2 that occurred on February 7, 2018 was due to the failure of the seal of the tail shield during the construction of the high-risk water-rich coarse sand stratum, which caused a large amount of soil and groundwater to ...

AI Technical Summary

Problems solved by technology

[0004] The sealing state of the tail shield is directly related to the safety of the entire tunnel. Once it fails, the grout and ground water and soil will be directly poured into the tunnel, causing great loss of personnel and property

At present, the control method of the tail shield sealing system is still extensive, and there is even no strict theoretical support for the design of the sealing system. The monitoring and early warning of the sealing state at home and abroad are almost blank. The patent application number is " CN201410717824.0", the patent name is "A Tail Shield Grease Sealing System for Shield Machine", which discloses a tail shield grease cavity sealing structure, and simultaneously performs pressure detection on each oil injection port, which plays an early warning role to a certain extent , but the overall detection is extensive, and due to the poor fluidity of the grease, the pressure loss along the way is large, and the measured pressure is not the real pressure in the grease chamber

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