Abstract:

The retaining piles of Museum station of Harbin Metro penetrate through underground shopping street and civil air defense tunnels. Rotary drilling machines equipped with alloy drill bits with teeth are used to penetrate through the floor slabs of existing structures. For the cavities between the existing structures, steel cases are used to protect the borehole walls and reinforced concrete is used to seal the cavities. In the end, the target of rapid and easy construction of retaining piles penetrating through existing structures is reached. 

Key words: Harbin Metro, penetrating through existing structure, retaining pile, rotary drilling machine, steel sleeve