Special scheme for foundation pit support and dewatering of earthwork construction
Building 6 # 7 # 8 # of Phase III of Changzhou Feilong Living Area Lot 2 # Project is located on the roof of the basement. The basement is a negative floor, with an elevation of ± 0.000 equivalent to 5.550m of the Yellow Sea elevation. The design service life is 50 years. The number of floors above the ground of Building 6 # 7 # 8 # is 31, 30, and 28, with building heights of 96.25m, 93.15m, and 90.05m respectively. The total floor area above the ground is 58492m2, and the floor area of the basement is 6300m2. The foundation type is pile raft foundation. The prestressed hollow square pile (prestressed concrete pipe pile) is 10m long, and the pile type is PHS-AB500 (300) - 10. The structure type is frame shear wall structure. The seismic fortification intensity of the building is 7 degrees, and the seismic grade is II. The floor elevation of the basement under the main building is -5.40 m and -5.250 m, the floor thickness of the basement under 6 # 8 # building is 1.25 m, the floor thickness of the basement under 7 # building is 1.10 m, the floor elevation of the basement on the south side of 6 # 7 # 8 # building is -5.250 m, the floor thickness is 0.4 m, the cushion thickness is 0.1 m, and the natural floor elevation is -1.85 m. Therefore, the depth of large area excavation is 5.4+1.25+0.1-1.85=4.9 m, and the deepest part of excavation, The sump pit is 2.2 * 1.2 * 3.2m near the elevator shaft, and foundation pit support and dewatering are required. The excavation site is relatively open, without building obstacles.
