Shield tail detection and repair method

Abstract

The invention relates to a shield tail detection and repair method. The shield tail detection method at least includes: at least two housings arranged at intervals along the shield tail circumferential direction in the sealed cavity formed between the shield tail and the sealing brush; The casing is provided with a first sensor and a second sensor that are not parallel to each other and are attached to the inner wall of the shield tail. The first sensor and the second sensor are used to detect the deformation information and vibration information of the inner wall of the shield tail, based on The optical information transmitted by the first sensor and the second sensor separates deformation information and vibration information, and obtains the deformation position and deformation degree of the shield tail based on the deformation information and vibration information, and based on the first The deformation information and vibration information transmitted by the sensor and the second sensor determine the deformation range of the shield tail and predict the probability of deformation of the shield tail for early warning.

Description

Technical field [0001] The present invention relates to the technical field of shield machine, in particular to shield tail detection and repair methods. Background [0002] Shield tunnel forming technology is a modern forming technology that uses a large-scale tunnel boring machine that integrates excavation, support, propulsion, lining and other engineering operations to complete tunnel excavation. In the process of shield machine boring, because the excavation diameter of the cutterhead of the shield machine is greater than the outer diameter of the segment, after the segment is assembled and the tail of the shield is detached, a circular gap is formed between the tail shield and the soil, that is, a gap of a certain size will be formed between the tail shield support and the tunnel lining structure (segment), which is connected to the tunnel soil layer with a certain pressure and the safe space inside the shield, so the corresponding sealing device is required to partition, ...

AI Technical Summary

Problems solved by technology

However, the shield tail monitoring system provided by this patent does not take into account the sensitivity of the pressure signal sensed only by the pressure sensor to the sealing of the sealed cavity formed between the seal brushes, that is, the pressure sensor detects that the pressure in the sealed cavity is too high. Large, but because there is no clear correspondence between the pressure and the sealing performance in the sealed cavity, when it finds that the pressure is too high and issues an early warning, it may have caused leakage, resulting in insufficient maintenance; or when it issued an early warning, the sealing The cavity is far from reaching the standard for leakage and maintenance, which leads to frequent alarms, causing frequent shutdowns of the shield machine due to excessive maintenance, delaying the shield construction period, and causing heavy losses

In addition, monitoring the sealing performance of the sealed cavity from the perspective of detecting the pressure of the sealed cavity does not take into account the change of the grouting pressure caused by the deformation of the shield tail

Specifically, the patent adopts the pressure sensor installed on the tail brush positioning block and cannot detect the pressure deviation in the radial direction of the shield tail, that is, the formed sealed cavity is annular. When the shield tail is deformed, each The pressure in the area may be different, and a large pressure deviation may also cause leakage. Only relying on the pressure detection on the positioning block of the tail brush can only obtain the pressure in this area, and cannot detect the uniformity of the pressure in the entire annular sealing cavity , making it impossible to detect leaks due to shield tail deformation

Images