The project is located at the intersection of Zhongshanmen Street and Maqun New Street. The construction scale is a 2-8 storey commercial street with a frame structure and a 3 storey basement. The bottom of the foundation pit is about 13.50m deep. The excavation area of the foundation pit is about 17000m2, the circumference of the foundation pit is about 520m, and the excavation depth is 13.5m. The safety level of the side wall of the foundation pit is Grade 1.
Foundation pit support scheme. The ABC section on the east side of the foundation pit uses a rotary excavation pile and two steel pipe supports as the support structure. The remaining sections are supported by secondary grading soil-nailed walls. GFRP reinforced soil-nails are 12m long and 1m apart. Inside the pit, open ditch + water collecting pit is used for drainage.
Project Application Type:
Support Engineering-Application of Durable Enclosure Piles
Corrosion resistance, high cost performance
The project is limited by the influence of the underground red line and cannot be constructed using conventional techniques. The project ultimately chose composite steel anchor cables to solve the construction problem.