Abstract
To find the interface of concrete and slurry in a cast-in place pile, the numerical simulation method and Laboratory tests are performed. Pressures along a pipe were obtained. Differential pressures of fixed distance were calculated. Differential pressure curves were plotted. The result shows that pressure along a pipe is differ. Differential pressure remains constant in certain mediums but changes across different mediums. The interface of concrete and slurry can be found from differential pressure plots. If transducers whose number is at least two can be tied on a fixed place of pipe, differential pressure will be obtained by pulling pipe out gradually, and the interface of the concrete and slurry will be found easily. This is useful for keeping pipe under concrete and ensuring pipe quality.
Highlights
IntroductionPipe is used for pouring concrete into a pile hole [1]
The cast-in place pile is part of underground construction
Numerical simulation and laboratory tests are performed to find the interface of concrete and slurry in the cast-in place pile
Summary
Pipe is used for pouring concrete into a pile hole [1]. Every pouring reaches a depth of 6 meters, at which point the pipe must be lifted. The pipe must be kept in concrete at a depth of at least 2 meters [2]. People always use a drop-hammer to detect the top of the concrete [4]. This method is manual and inefficient because pouring progress has to be stopped. To find the interface of concrete and slurry in cast-in place pile in a timely way, differential pressure was measured by numerical simulation and laboratory tests
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