The Key Technology Research To The Fortification And Safety Of The Large Portal Crane In Watercourse

For the construction machinery’s safety in the river during the flood season, this paper studied the key technology to the fortification of the local fixed portal crane, and obtained the system solutions. With this result, the construction units can save the costs significantly and shorten the time to re-work, which will eliminate the drawback to remove the machine before the flood and install the machine after the flood.With the construction of hydraulic engineering in Sichuan Province by a certain company, through investigating the fortification methods to the large portal crane in the watercourse, this paper studied key technology and provided the scientific basis and the support. The research line is using the finite element platform Ansys Workbench and its affiliated modules, we can do fluid dynamics analysis, modal analysis and fluid-structure interaction analysis to the portal crane, then simulate and optimize the original fortification scheme. Conclusions are drawn as follows:(1) With the hydrometeorological date of the river, we can predict the loading state of the crane accurately by using the computational fluid dynamics software CFX. Under the effect of the highly turbulent and three-dimensional spanwise in high reynolds number flow field, there is not ideal Karman vortices behind the crane, which means the fluid effects has not regular pattern and the system will not form the resonance;(2) It is reasonable to use the spring function to simulate the wire rope in the static analysis module in the workbench platform, which can imitate the mechanical characteristics of wire rope. The comparison of calculation results with actual data shows that the simulation is in accord with the actual situation and the original scheme is feasible;(3) Optimize the layout of the wire rope, we study the relationship of its angle and height’s arrangement, and consider the cost based on the optimized scheme by reduce the number of the ropes, the reduction in the use of the wire ropes reach to27.96%.This paper achieves certain results for the key technology to the fortification in watercourse, mainly reflected in the scheme’s better designation which was based on standards and criterions and the feasibility of the finite element software for engineering simulation. At the same time, it also provides important reference for the similar problem.