Contractor： China Railway No.2 Engineering Co., Ltd.
Specification： Φ980mm*32mm
Material：Q460D
Hangzhou is complex in geology, and the engineering difficulty is twice that of the Shanghai Metro.
The upper layer is relatively soft silty clay and sandy soil, and the lower layer is relatively hard gravel and pebble layer.
There is also pressurized water between the soil layers, which is very strict with steel pipe piles.
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