The project is located in Xiong'an New Area, invested by Hebei Xiong'an Zhihui City Construction Development Co., Ltd of Power Construction Corporation of China, our company was responsible for the construction of foundation support and pile foundation of this project, and completed about 3,290 m² of sprayed concrete surface, about 5,580 m of soil nailing wall, about 6,580 m of anchor cables, about 2,620 m of steel girders, about 4,600 m of steel sheet piles, about 212 m of water retaining wall, and more than 420 bored piles, including more than 50 piles with diameter of 0.6 m and more than 370 piles with diameter of 0.8 m.
The project started on March 06, 2021, and the construction was completed on April 30, 2022, with a construction period of 419 calendar days. This project has a tight schedule, large volume of work, special geographical location, which affects the steel sheet pile construction. Moreover, there are more cross-operation at each working surface, and there are many interfering factors, and the excavation, pit support and foundation treatment are carried out simultaneously, which has higher requirements on our construction organization. Our project department carefully planned, organized, and actively communicated with the general contractor, designers, supervisors, and other departments on site to ensure the safe, orderly and efficient implementation of the project. In the construction, wet spraying machine was used for spraying concrete, which greatly accelerated the construction efficiency. The steel sheet pile construction used drilling rigs to drill the guide hole, which greatly accelerated the construction efficiency and completed the task objectives.
The main items of foundation pit support of this project are all qualified, and the general items meet the specification requirements. The hole depth, hole diameter, perpendicularity, thickness of slag before grouting, cage diameter, cage length, welding quality and other indicators have all been accepted by the quality inspection engineer of the general contractor and the supervising engineer, and the passing rate reached 100%. More than 240 piles were tested with low strain, more than 40 piles were tested with ultrasonic, and 3 piles were tested with static load, all of which were qualified.
