| With the development of the global economy and the improvement of human environmental awareness,the direction of global power resource development has gradually pointed to offshore wind power.China has more than 18,000 kilometers of coastline and abundant offshore wind energy resources.As the demand for energy grows,the offshore wind power industry is bound to develop rapidly.Throughout the construction process of the domestic wind power industry,it is mainly divided into foundation installation and fan hoist.The single pile foundation is the most common and practical in all wind turbine foundations.A stable foundation will be the important support for the offshore wind turbines standing on the seabed.However,it is found that the soft soil cover of the seabed is very thin Fujian,Dalian and Guangdong in the current offshore wind turbine installation process.It is necessary to drill the seabed soil layer for the installation of the offshore wind turbine foundation,which is named rock-socketed foundation installation.The split lifting of the fan is the main installation method in the current process.The installation process and safety of the rock-socketed single-pile foundation installation and fan hoist.It will has high engineering value.The installation technology and the safety assessment were carried out for the problems in the construction process of the rock-inserted single-pile wind turbine in this paper.A research on the construction and installation process of rock-socketed single pile wind turbine foundation was carried out firstly.The rock-socketed single piles are divided into three types according to the embedded rock depth.The installation technology of these three rock-socketed single piles were studied detailedly using the analogy method,including the schemes of the detailed construction process,transportation and uses of each device.The stability safety of the key auxiliary stable platform was carried out for the process rock-socketed installation secondly.Based on the evaluation method of sea soil ultimate bearing capacity,the calculation method of initial depth of stable platform was given.Based on this,the stability safety calculation method of the rock-socketed stabile platform was presented based on the P-Y curve method,including the rock-socketed load and wind,wave and current environmental load comprehensively during rock-socketed installation process.A calculation and analysis of the geological in a certain sea area were carried out.It is shown the feasibility of the method.Then,the dynamic load need to be included for the rock-socketed installation process.The stability of the stable platform was studied under dynamic load.On the basis of the overall modal analysis of the stable platform,the rock-socketed load is idealized as harmonic excitation and transient load.A series dynamic response research of the stable platform were carried out.The results show that the response of the stable platform under dynamic rock-socketed loading was small,which satisfied the installation requirements.Finally,a research on the hoisting process of the wind turbine was carried out,which simulated the process the split hoisting of the wind turbine completely.A series of practical and simple construction schemes were given,which will give the reference to the investment,design and construction of the same type or similar projects in China.On this basis,the safety analysis of the process of the pile-winding crane,collaborative work of pile-winding crane and the crawler crane were carried out for the self-lifting wind turbine installation platform,which shows the feasibility of the lifting scheme. |
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