Soil pressure control is one of the most important technology of pipe pushing engineering with earth balance shield machine.
土压平衡式顶管掘进机机头泥土仓土压力控制是顶管工程中最关键的技术之一。
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Upper and under connection design which avoid water block, keep air smooth in the pipe, sure the pressurebalance in the pipe, is good to improve drainage ability.
With an example of a section of air duct with a tee, analyses the existing problems when adjusting pipe diameter according to the pressurebalance formula and the causes.