A construction method of combined double-row pile support system

Abstract

Provided are a combined double-row pile supporting system and a construction method thereof. The supporting system comprises front row piles, a front row pile top beam, rear row piles, a rear row pile top beam and a connecting beam. The front row beams are a row of reinforced concrete piles which are arranged at intervals in parallel. The rear row beams form a steel cement mixing pile wall, and the connecting beam is a double-limb connecting beam. Inward-inserting type steel in the steel cement mixing pile wall is H-shaped steel, and the upper end of the H-shaped steel is exposed out of the upper portion of the rear row pile top beam. Shallow layer reinforcing cement soil piles are further arranged between the front row piles and the rear row piles, and the shallow layer reinforcing cement soil piles and the steel cement mixing pile wall are overall in lap joint. The combined double-row pile supporting system overcomes the defect that a waterproof curtain needs to be additionally arranged in a common double-row pile supporting structure in foundation pit engineering where water needs to be blocked and also overcomes the defect that the rigidity of the steel cement mixing pile wall is low, unification of soil blocking and water isolating of the supporting structure is achieved, and the cost of the supporting engineering is greatly lowered.

Description

Technical field [0001] The invention relates to a building foundation pit supporting system and a construction method thereof. Background technique [0002] Cantilevered steel cement-soil mixing pile wall (also known as SMW construction method) and ordinary double-row pile supporting structure with the front and rear rows of reinforced concrete piles are more and more supporting forms used in foundation pit engineering in recent years. [0003] The cantilever type steel cement-soil mixing pile wall is mostly used in soft soil, silt, fine sand and other non-hard geological conditions. It is a composite soil and water-retaining structure formed by inserting H-shaped steel in the cement-soil mixing pile. The characteristics of high water cut-off, economy, low construction pollution, and small impact on the surrounding environment, and after the basement construction is completed, the H-shaped steel in the steel-cement-soil mixing pile wall can be pulled out, and then recycled and reus...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for a combined double-row pile support system. It is necessary to solve the problem that in the foundation pit project that needs water interception, the cost of the ordinary double-row pile support structure is too high, and the use of cantilever type steel cement soil The mixing pile wall cannot meet the safety and deformation control requirements of foundation pit engineering

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