Novel method for reinforcing deep soft foundition-cencrete core sand stone pile compound foundition method

Abstract

The invention relates to deep-thick soft foundation reinforcing new method-concrete core sand stone pile composite foundation. It is aimed at the current problem, and combines drainage consolidation method. It is used pre-form concrete pile as pile core to bear vertical load and transmit it to below solid ground. The medium coarse sand or brash chips are filled around to use as pile shell to increase core pile side surface friction resistance and vertical drainage. The pile body is laid with mattress layer to from new composite foundation. The method has the advantages of simple construction, fast pile forming speed, fast earth strength resuming, saving curing time and high strength. It can be applied to deep-thick soft earth foundation with high water and organic matter content, especially for irrigation works and traffic engineering.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a reinforcement treatment method for deep and thick soft soil foundations with high water content and high organic matter content, specifically a new method for strengthening deep and thick soft foundations—concrete core sandstone pile composite foundation method . Background technique [0002] At present, the soft soil foundation treatment methods mainly include surcharge preloading method, dynamic compaction method, cement mixing pile, powder spray pile, compacted sandstone pile, CFG pile, cast-in-place thin-walled pipe pile, prefabricated pipe pile composite foundation method, etc. Among them, the surcharge preloading drainage consolidation method is simple in construction and low in cost, but there are problems such as long reinforcement period, large post-construction settlement, and strict requirements on loading speed in order to ensure foundation stability during construct...

AI Technical Summary

Problems solved by technology

Among them, the surcharge preloading drainage consolidation method is simple in construction and low in cost, but there are problems such as long reinforcement period, large post-construction settlement, and strict requirements on loading speed in order to ensure foundation stability during construction; Lack of mature design and calculation methods, small ramming energy of reinforcement equipment, shallow reinforcement depth (generally about 10m), difficult construction when the groundwater level is high, poor reinforcement effect, etc.; cement mixing piles and powder spray piles are cheap, and the construction technology is relatively mature , but there are problems such as shallow reinforcement depth (the quality of the general construction unit can guarantee the depth within 12-14 meters), the mix ratio and construction technology must be adjusted in time according to the geological conditions, the technical level of the construction unit is strict, and the construction quality is not easy to control. Dense sand and gravel piles have problems such as poor continuity and low bearing capacity when the natural soft soil strength is low; immersed tube hole-forming CFG piles have problems such as poor continuity at the bottom when the natural soft soil strength is low, and long spiral hole-forming CFG piles There are problems such as less reinforcement equipment, and the investment is about 10% higher than that of sinking tube hole-forming CFG piles; cast-in-place thin-walled pipe piles have problems such as difficult quality inspection and large investment; prefabricated pipe piles have difficulties in penetrating hard interlayers and large investment And other issues

Generally speaking, drainage consolidation methods generally have problems such as long reinforcement period, large post-construction settlement, and strict requirements for filling; low-strength pile composite foundation methods generally have problems such as difficult quality control and shallow reinforcement depth; high-strength composite foundation methods generally have problems such as difficult quality control and shallow reinforcement depth. There are problems such as large investment, so these methods have their scope of application

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