Vibration process of eliminating wet foundation falling for CFG pile

Abstract

The present invention discloses vibration CFG pile process of eliminating wet foundation falling. The process includes first determining the vibration CFG pile positions in wet falling loess foundation with piles in equiangular triangle arrangement, the subsequent determining the pile interval equal to 3-5 times pile diameter, and final constructing piles in vibration sunken tube deposition method. The present invention can raise the bearing capacity of foundation and eliminating wet foundation falling, and has short construction period and low cost.

Description

Technical field: [0001] The invention relates to construction engineering, in particular to a construction method for building foundations. Background technique: [0002] CFG pile is the abbreviation of cement fly ash gravel pile. When designing CFG pile composite foundation, if the foundation is collapsible loess, the previous construction will be divided into "two steps": first, adopt methods such as dynamic compaction to eliminate or partially Eliminate the collapsibility of the foundation soil, and then carry out the construction of cement fly ash gravel piles. The dynamic compaction in the first step increases the difficulty of the pile construction in the second step, so that the construction period of the foundation project is long and the cost is high. [0003] For collapsible loess foundation treatment, there is also a method of "lime-soil compaction pile": first excavate the pile hole, then mix 3:7 lime and soil into the hole, ram the pile in layers, and then comp...

AI Technical Summary

Problems solved by technology

Lime-soil compaction piles have two disadvantages. One is that the material cost of 3:7 lime-soil is relatively high, and the unit price is about 20% higher than that of cement fly ash gravel piles (fly ash is the waste of thermal power plants and can be used cheaply. ); the second is that the pile spacing is required to be small, which is 2 times the pile diameter. If lime-soil compaction piles are used in a site, the number of piles will be 2.25 times the number of CFG piles, and the cost and construction period are not economical.

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