Abstract
According to the structural characteristics of EPB shield bracket, the author establishes 3D solid model by Solidworks and corresponding finite element model of the bracket portion which is connected to the cutterhead by ANSYS WORKBENCH software. Through the static analysis of bracket’s stress characteristics under extreme conditions, we get its stress, deformation and safety coefficient distribution law under the maximum constraint conditions. After getting the maximum equivalent stress, the analysis of the calculation results shows that this kind of bracket with good static characteristics can meet the design strength requirement. This paper points out the weak position of bracket’s strength, and provides some reference data for the structural optimization design, as well as some basic data for both the structural design of bracket and the construction maintenance. Moreover, the structure analysis in the process of the grid selection and the key technology of the post-processing method are discussed in detail. The design example shows the effectiveness of the method.
Highlights
Shield tunneling machine is a special machine for tunneling, and the shield bracket is one of the main working partsof shield tunneling equipment
The structure of shield bracket is directly related to the quality of the tunnel project and the costs and service life of cutting tool
Because the overall size of shield bracket is larger while its local design size is relatively small and design installation and testing are very complex with high cost and complex on-site maintenance, high requirements on bracket design are put forward
Summary
Shield tunneling machine is a special machine for tunneling, and the shield bracket is one of the main working partsof shield tunneling equipment. With complex cutterhead design structure and great construction intensity, the bracketwhich transfers power to the cutterheadis required to be with high strength. Reasonable structure, as one of the key technologies of the shield, can ensure the high-efficiency operation of the shield construction machine, and improve the service life of cutterheadand many other parts of the machine and narrow tool cost. This paper puts forward a simulation design method specialized for the strength of shield bracket, and it combinesthe analysis of the stress and strain fields of the structure element with the shield bracketwhich isdesigned and checked by Ansys, one kind of powerful analysis system, the targeted physical experiment strength analysiscan be realized so as to finish the rapid and effective design
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