Construction Technology for Large-diameter Pipe Jacking in Quicksand Formations
In Xiaohai River Water Connection Project in Dongguan City,the top pipe method is used to cross a certain water supply channel,with a diameter of DN1 500 reinforced concrete Grade Ⅲ pipe.The pipe jacking passes through a medium coarse sand layer with a permeability coefficient(cm/s)of 1.113E-03,which is analyzed to be moderately permeable.The groundwater level is 4.8 m and relatively high.The net distance between the foundation piles of a certain water supply channel is 9.8 m,the pile length is 13.6 m,and it is located in the middle of the top pipe section.Due to the strong permeability of the medium coarse sand layer,it is easy for sand to flow and cause surrounding collapse during the jacking process.And the net spacing between the pile foundations of a certain water supply channel is 9.8 m.The main construction difficulty of this project lies in the pipe jacking section.
top pipeflowing sand geologypermeabilityadvanced grouting
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