At the construction site of the first phase of the Fuqing Xinghua Bay Offshore Wind Power Project, under the morning light, the XCMG golden equipment on the tower stands out against the deep blue sky. XCMG rotary drilling rigs and cranes appeared together on the horizon, ensuring the smooth progress of the project. This is the first time a Chinese rotary drilling rig has entered an offshore wind farm for the subsequent rock-socketed bored pile construction of the main steel pipe piles. 　　The Fuqing Xinghua Bay Offshore Wind Farm covers a total area of 33.2 square kilometers and is developed in two phases. The current development is the first phase of the Fuqing Xinghua Bay Offshore Wind Farm, namely the prototype test wind farm. It is the first leading, demonstrative, and landmark project of large-scale contiguous development of offshore wind power in Fujian launched by China Three Gorges Corporation after signing a strategic cooperation agreement with Fujian Province, and it is also China's first high-power offshore wind turbine prototype and offshore operation test project. It plans to install 14 wind turbines, each with a four-pile cap foundation design, pile diameter of 2.8m, maximum drilling depth of 96m, and the pile end is required to be embedded in slightly weathered granite for no less than 5 meters, with the maximum uniaxial compressive strength of granite at 133 MPa. The effective construction time of the project is less than 8 months, and 56 rock-socketed pile foundations need to be completed. The tight schedule, difficult construction organization, and short effective working time have brought many challenges to the construction party, Jiangsu Hengxiang Construction Engineering Co., Ltd.
　　The difficulty of the pile foundation construction for this offshore wind turbine unit is reflected in multiple aspects. First, the platform area is small, requiring refined organization and management. The platform is divided into a main platform and an auxiliary platform. Four main steel pipe piles are distributed in a rectangle on the main platform. Apart from the space occupied by the rotary drilling rig, the remaining space can only accommodate a small amount of drilling tools and necessary construction auxiliary equipment. A crawler crane is parked on the auxiliary platform for transferring accessories, equipment installation, and maintenance. Second, the team needs strong technical expertise. The 180-ton XR550D rotary drilling rig is placed on an isolated platform. During rock-socketed drilling, reasonable drilling tools must be selected, and the operator must have skilled operating skills to ensure equipment stability and not reduce drilling efficiency. Third, the formation is complex; the rock is not only high in strength but also has steeply inclined rock layers. 　　XCMG's integrated solution has created tremendous value for users. The world's largest tonnage XCMG XR550D rotary drilling rig controls the single pile completion time within 4.5 to 6 days, with a monthly output value of up to 2.4 million yuan, which has been highly recognized by Jiangsu Hengxiang Construction Engineering Co., Ltd.