Foundation treatment for China Energy Zhaoqing power plant phase II 2×400MW(F)-class gas-fired cogeneration projectis located in Zhaoqing City, Guangdong, invested by China Energy (Zhaoqing) Cogeneration Co., Ltd. A total of 1,020 bored piles with pile diameter of 0.8m and 919 PHC prestressed concrete pipe piles with pile diameter of 0.6m were completed.
China Energy Zhaoqing power plant phase II 2×400MW (F) class gas-fired cogeneration project started on August 14, 2022 and was concluded on October 15, 2023. After third-party testing, the pile foundation construction meets the design and specification requirements, with a 100% pass rate.
During the construction, all the project team members gathered their ideas and dealt with a total of 248 piles in soil holes and karst holes. Due to the design requires 10% of the piles to be tested by crosshole sonic logging for integrity testing, but the geotechnical properties below the pile end cannot be detected, in this regard, the project depart developed "a construction device for geotechnical sampling at the pile end of ultra-deep bored piles", through the sonic tube to set down a small drill bit and drill rod to the bottom of the tube, and connected to the bench drilling machine to carry out the geotechnical sampling at the end of the piles , and applied for a utility model patent (Certificate No. 19693622), and the provincial construction method in Hebei province (Method No.: HBGF061-2023).
