Abstract
This work aims to investigate the force transmission characteristics of a thrust system in a rectangular shield machine under the influence of various factors. These factors main include the external partial loads produced by the heterogeneity of rock and soil on the excavation face, the uneven distribution of friction acted on the shield body of the shield tunneling machine, the uneven distributed mass of the main machine, or attitude correction in the tunneling construction progress. First, the force uniformity mechanical model for the rectangular shield machine has been set up on the basis of the external loads. The force transmission characteristics of the model for the thrust system have been discussed in detail. Then, the method of reconfiguring the hydraulic cylinders in the thrust system to improve the force transmission performance has been proposed. Finally, virtual prototype simulation has been conducted to verify the effectiveness of presented method. Results show that the coefficient variation (CV) value of the reconfigured thrust system is much smaller than that of the unadjusted one, indicating that the force uniformity of the reconfigured thrust system is better. Such results would provide foundation and support for the design of a rectangular shield machine that can avoid partial loads.
Highlights
Nowadays, the population and buildings are concentrated in areas where roads between buildings are narrow and the underground pipelines are intensive
The external loads and the structural parameters of the shield machine mainly affect the force transmission characteristics of the thrust system in shield machine
The mechanical model for the thrust system in the rectangular shield machine has been presented in this paper
Summary
The population and buildings are concentrated in areas where roads between buildings are narrow and the underground pipelines are intensive. Few studies have investigated the force transmission characteristics of thrust systems in a rectangular shield machine. The external loads and the structural parameters of the shield machine (the phase angles of the jacks and the radius of the thrust system) mainly affect the force transmission characteristics of the thrust system in shield machine. Under the condition of given external loads, the anti-bias characteristic is realized by changing the layout of jacks in the thrust system. The mechanical model for the thrust system has been proposed On this basis, the force transmission characteristics of the thrust system in rectangular shield machine have been analyzed for the first time in detail. The reconfigurable thrust system for the rectangular shield machine has been presented to realize the anti-biased load characteristic or force uniformity characteristic. The comparison between the simulation and numerical outcomes has verified the reconfigurable models
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