Taking the superhighway engineering of Fuzhou International Airport as an example,this paper introduces the reinforcing mechanism and applicability of the cement-flyash-macadam concrete pile,expounds the design,construction and detection of the cement-flyash-macadam concrete pile,analyzes on the causes of some quality problems,and puts forward some corresponding methods for treatment.

Under the complex geological condition where the backfill is on thick soft clay, the design method of combining fly ash concrete pile and lime pile is presented.

Quality control and management of flyash gravel pile;

This paper introduces the basic principles of detecting the quality of concrete filling pile by using ultrasonic transmission method and the main steps and notes of the field detection, and probes into the methods for judging the defects of filling pile and the methods for determining the pile integrity categories.

Based a concrete filling pile engineering example, the method, to properly treat the pile hole caving and joining is introduced.

Taking the pile foundation engineering of a superhighway as the example, this paper introduces in detail the construction method of the flyash concrete filling pile.

On concrete grouting piles foundation in projects

Based on the characteristics of permafrost in plateau along the Qinghai-Tibet Railway, simulating calculation about the ground temperature during constructing concrete grouting piles is made by finite element program Ansys5.