Abstract:

During the construction of Metro station constructed by cutandcover topdown method, the safety of foundation pit and the appearance of the Metro station is restricted by construction quality and appearance of horizontal structural plate (as temporary horizontal support structure and permanent structure) respectively. The concrete surface always goes rough due to floor mold used in horizontal structural plate, and the concrete of floor mold and that of structure always bond together. As a result, short support is adopted. The application of short support formwork to Chegongmiao Hub in Shenzhen shows that: 1) The appearance quality of casting concrete can be guaranteed. 2) The surface of formwork is clean than that using floor mold method. 3) The appearance quality of concrete of structure can be guaranteed. 4) Easy mold unloading and safe. 5) The short support formwork shows a quick adaptability to bad geological conditions and complex structural plate shape.

Key words: Shenzhen Metro, short support, cutandcover topdown method, Metro station, concrete