Why subway steel erection erection to the design elevation of 800
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The excavation of the foundation pit is divided into 3 steps: large scale mechanical excavation and 1 manual excavation, which are as follows: (1) the first layer is mainly made of short arm excavator, which is excavated to the ground below 0.9m
First -0.4m; -4.3 m; third -7.8m; -11.0 m; fifth -14.2 M.
