Sinking pipe soil withdrawing and cast-in-place rectangular supporting pile diaphragm wall and construction method thereof

Abstract

The invention provides a sinking pipe soil withdrawing and cast-in-place rectangular supporting pile diaphragm wall. The sinking pipe soil withdrawing and cast-in-place rectangular supporting pile diaphragm wall is characterized in that a combined diaphragm wall is arranged at the outer side of a foundation pipe, wherein the combined diaphragm wall comprises a parallel, sinking pipe soil withdrawing and cast-in-place reinforced concrete supporting piles with rectangular sections and 1 to 4 rows of lapped cement mixing piles or cement jet grouting piles; the long side of the rectangular cross section of each supporting pile is 600 to 1200mm, the short side is 200 to 700mm, and each pile is 10 to 30m in length; each cement mixing pile or cement jet grouting pile is 500 to 1200mm in diameter and 10 to 25m in length. Compared with the existing general foundation pit supporting scheme, the method has the advantages that the construction process is simple; the quantity of used concrete and steel is reduced by 30%, the construction cost is reduced by 25%, the construction is free of slurry pollution, the noise is low, the environment is protected, the energy is saved, and the urban construction in coastal soft soil regions is met.

Description

technical field [0001] The invention relates to the field of building foundation engineering, in particular to a ground connection wall of rectangular support piles cast-in-situ by immersed tubes and soil extraction and a construction method thereof. Background technique [0002] At present, in the urban construction of coastal soft soil foundations in my country, bored piles, steel sheet piles, SMW construction methods, and reinforced concrete ground connection walls are mostly used as foundation pit support for excavation depths of more than 5m. The effect is good, and it is also very safe, but the construction cost is relatively high. [0003] The reinforced concrete design code tells us that when the concrete cross-sectional area is equal and the reinforcement ratio is the same, the bending capacity of the rectangular pile is 1.5 times that of the cylindrical pile; 30% less pile area, 30% less concrete and 35% less steel. Contents of the invention [0004] The purpose...

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Problems solved by technology

[0002] At present, in the urban construction of coastal soft soil foundations in my country, bored piles, steel sheet piles, SMW construction methods, and reinforced concrete ground connection walls are mostly used as foundation pit support for excavation depths above 5m. The effect is good, and it is very safe, but the construction cost is relatively high

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