Method for supporting and protecting building foundation pit by employing transverse-diaphragm prestressing concrete pipe pile

Abstract

The invention discloses a method for supporting a building foundation pit by using transverse partition-type pre-stressed concrete pipe pile. The method comprises the following steps: (A) calculating and determining the axial position of inner transverse partitions (1, 1.1, 1.2, 1.3, 1.4) of a transverse partition-type pre-stressed concrete pipe pile (12) and the diameter and length of the pipe pile (12); (B) fabricating the pipe pile (12); (C) measuring and lining to determine the position of the pipe pile (12); (D) statically settling the pipe pile (12); (E) welding anchoring tendons at the top of piles and fabricating and installing reinforced concrete top ring beams (7) and supporters (8). The method further comprises driving concrete-stirring piles (9, 10) respectively inside and outside the pipe pile (12) and grouting concrete (5) inside the pipe pile (12). The method has the advantages of wide application range, high construction quality, short construction cycle, relatively-low construction cost for foundation pit support, and no noise and vibration pollution.

Description

technical field [0001] The invention relates to a method for supporting a building foundation pit, in particular to a method for supporting a building foundation pit by adopting a diaphragm type prestressed concrete pipe pile. Background technique [0002] At present, the main methods of building foundation pit support are: sloping excavation method, using soil nail wall or cement mixing pile to form a gravity retaining wall method, using immersed tube grouting pile or bored grouting pile method and using ordinary Prestressed concrete pipe pile method, etc. The advantages of the sloping excavation method are convenient construction, fast construction progress, low project cost, and good economic benefits, but its scope of application is small. It is only suitable for foundation pits with small excavation depth and good soil conditions, and requires There is an open space with slopes; the method of using soil nail walls or cement mixing piles to form a gravity retaining wall...

AI Technical Summary

Problems solved by technology

The advantages of sloping excavation method are convenient construction, fast construction progress, low project cost, and good economic benefits, but its scope of application is small. There is an open space with a slope; the method of using soil nail walls or cement mixing piles to form a gravity retaining wall has slow construction progress, high cost, and difficult control of deformation, which affects the quality of the project and the safety of the foundation pit. It is not applicable when the excavation depth is large; the method of sinking cast-in-place piles or bored piles has a wide range of applications, but the cost of foundation pit support is high, the construction progress is slow, the loss of raw materials is large, and the noise of mud or vibration pollutes the environment; and Ordinary prestressed concrete pipe pile method has been widely used in foundation pit support due to its advantages of convenient construction and fast speed, but its low flexural bearing capacity and poor lateral displacement stiffness make the safety of foundation pits not good , especially the horizontal spacing arranged around the foundation pit is relatively dense, which increases the number of prestressed pipe piles and increases the cost of support

Images