Abstract
The article considers the problems of the magnetic field distribution, generated by a power electric cable at the micro-tunnel-boring shield arrangement site by numerical modeling with a further full-scale device model experiment. The impact of foreign magnetic field sources on readings of three-component sensors was established in the process of the study. The considerable existence of parasitic noises, conditioned by external magnetic fields and high sensitivity of the probes, which will require the use of additional filters, was established. When using three-component ferroprobes, the most informative is the probe component coinciding with the tunnel shield longitudinal axis Z. The study showed that with current values greater than 200 A and changes in cable location during the experiment, it is possible to record signals from other sensor components and subsequently determine the location and orientation of the current-carrying cable. The experimental results obtained confirm the feasibility of a multi-sensor probing device for the micro-tunneling machine shield movement control system.
Highlights
During the construction of municipal gravity and pressure sewerage systems, heating mains, gas pipelines and other underground utilities, micro-tunnel-boring machines are used [1]
The results of numerical simulation of a three-dimensional magnetic field of a currentcarrying conductor and a micro-tunnel-boring shield indicate the possibility of using the magnetometric method for detecting power cable lines
Ferroprobes can be placed in the housing of the micro-tunnel-boring shield
Summary
During the construction of municipal gravity and pressure sewerage systems, heating mains, gas pipelines and other underground utilities, micro-tunnel-boring machines (shields) are used [1]. It should be noted that in big cities most power cable routes are located in the ground, and the total number of performed excavation works in municipal areas in developed countries may exceed several million [2]. This work was carried out as part of a project to develop a micro-tunnel-boring shield for tunneling 1.4 m in diameter for supply utilities of various purposes. In this case, the customer’s requirement for the probing system was to be able to be installed on the micro-tunnel-boring shield and to be able to detect power cable lines along the boring path
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