Reinforcing design and construction technology of large-diameter artificial bored pile segregation accident

Artificial bored pile has high bearing capacity and is convenient to construct and has been widely applied to civil engineering. However, concrete segregation will happen due to ineffective construction measure when there is an higher groundwater table. There are three kinds of piles including compressive pile, uplift pile and pull-compressive pile in a stadium pile foundation project, and concrete segregation phenomenon is detected. The characteristics and reasons of segregation are analyzed by coring test data of piles. According to different mechanical properties and segregation locations, the pulling resistant anchor added in the piles is used to reinforce the uplift pile, and the micro-steel pile added in the piles is employed to reinforce the compressive pile and pull-compressive pile. The construction measures of reinforcing methods are introduced. The static loading tests and situation after pile strengthening that the reinforcing design and construction measures have achieved satisfactory effect, and it may provide reference for similar reinforcing projects of pile concrete segregati on accident.