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Screw stacks are generally constructed from architectural steel. The tremie method of positioning concrete entails lowering a pipe to the base of the excavation, the pipe end at the top of the excavation is connected to a concrete hopper. The hoper and the pipe are after that charged with the wet concrete mix. The pipe is after that slowly raised out of the excavated opening, placing concrete as it goes. During the lifting procedure, concrete is constantly restored to the hopper in mini piling contractors in north west order to keep the system totally charged.