Abstract
The article presents a variant for improving the design of a working body of a tunneling shield, its cutting part to be more precise. The working body of the tunneling shield has been improved with the changes in the design of a rotor working surface. The theoretical studies aimed at determining the strength characteristics of the proposed rotor design have been carried out. The proposed rotor model has been visualized with the use of the T-Flex CAD software. On the basis of the results obtained in the course of the theoretical research, a comparative analysis of the strength characteristics of the main and improved model of the cutting working body of the tunneling shield have been made. The studies carried out at T-Flex CAD confirmed the working capacity of the improved design of the tunneling shield working body. The strength of the rotor has been determined as a result of the studies carried out. The maximum values of the displacement module is 2.875E-05 m, the equivalent stresses are 29.47 MPa, a reserve coefficient on equivalent stresses is 9.446E 06.
Highlights
A tunneling shield is a prefabricated mobile metal structure, the function of which ensures the safety of tunneling works and the assembly of the permanent support of the tunnel [1]
The theoretical research aimed at determining the strength characteristics of the proposed design of a working body of a tunneling shield was carried out in the T-Flex CAD software product
The article proposes the model of the structural modifications in a cutting part of a tunneling shield
Summary
A tunneling shield is a prefabricated mobile metal structure, the function of which ensures the safety of tunneling works and the assembly of the permanent support (lining) of the tunnel [1]. The diameter of the tunnels obtained with the tunneling shield may vary from 1 to 19 metres. The use of this machine makes it possible to implement the trenchless method of pipeline with a mechanical method in both watered and dry soils without a human involvement in a bottom [3]. The issues, related to the redesign of the working bodies of the tunneling shield in order to improve productivity and safety as well as to reduce annual costs and benefits, are still relevant
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