Cutter changing control method for hob of shield tunneling machine in composite stratum

Abstract

The invention discloses a cutter changing control method for a hob of a shield tunneling machine in a composite stratum. The cutter changing control method comprises the following steps: firstly, divding hob abrasion grades; 2, establishing a hob wear key influence factor evaluation index set in the composite stratum, and segmenting secondary evaluation index parameters in the evaluation index set; 3, determining the weight of the first-level evaluation index and the weight of the second-level evaluation index; 4, determining a fuzzy matrix of each primary evaluation index; 5, performing primary fuzzy evaluation to obtain a primary evaluation index membership degree; 6, carrying out secondary fuzzy evaluation to obtain a wear grade membership degree; 7, calculating the effectiveness of thewear grade membership degree; 8, judging whether the effectiveness alpha is not less than 0.5 or not; 9, determining the current hob abrasion level; and 10, controlling the hob to change. According to the method, the abrasion degree of the hob under different tunneling distances can be judged under the condition that the hob does not enter the shield soil bin, reference is provided for the tool changing opportunity of shield machine construction, tool changing is timely, and the situation that the construction progress is affected due to damage to the cutterhead is avoided.

Description

technical field [0001] The invention belongs to the technical field of hob cutter change control of a shield machine, and in particular relates to a control method for hob cutter change control of a shield machine in a compound stratum. Background technique [0002] The shield tunneling method has become the main construction method of current tunnel construction due to its advantages of safety, reliability and high efficiency. However, the serious wear of the shield cutter and the evaluation of the wear degree have always been the difficulties in the construction of the shield tunneling method. Especially in complex formations, abnormal wear phenomena such as hob eccentric wear or tool collapse often occur, and the tool is easily worn to failure. [0003] During the construction of the shield tunnel, the hob rotates with the cutter head on the one hand, and rotates around the cutter shaft on the other hand to squeeze and break the rock. The wear is mainly caused by the fri...

AI Technical Summary

Problems solved by technology

[0005] At present, scholars at home and abroad have made many achievements in the research on tool wear status based on hob wear theory and shield tunneling parameters, but the factors affecting hob wear are diverse and complex, and the degree of hob wear cannot be fully judged only by a single factor In the actual situation, the hob wear is affected by the interlacing and overlapping of various factors. The hob needs to be shut down for tool replacement. Too early hob tool change will affect the construction efficiency and delay the construction period. Too late hob tool change will reduce the rock breaking efficiency. , The cutter head is worn or even shut down for repair, which seriously affects the construction progress and increases the construction cost

Images