tailieunhanh - TOP-DOWN CONSTRUCTION

Some of the underground Rapid Transit System (RTS) stations are constructed by the “top-down” method. In this method, the underground retaining walls are first installed. In most cases, these retaining walls are concrete diaphragm walls. This is followed by excavation to just below the roof slab level of the underground structure, with the retaining walls and struts supporting the soil at the sides. The roof slab is then constructed, providing a massive support across the excavation. Access openings on the roof slab are provided so that works thereafter could proceed downwards to the base slab level of the underground structure. Upon completion of the base slab, the side. | 03 . Construction of Underground The roof slab is constructed with access openings provided on the slab for works to proceed downwards. The roof slab not only provides a massive support across the excavation it also acts as a noise barrier. 04 . Construction of Underground Structure The next level of slab is constructed and this process progresses downwards till the base slab is completed. While noise dust and other inconveniences are inevitable during construction LTA will work closely with the contractor to keep them to a minimum. 05 . Construction of Underground Structure 06 . Backfilling Reinstatement Some of the underground Rapid Transit System RTS stations are constructed by the top-down method. In this method the underground retaining walls are first installed. In most cases these retaining walls are concrete diaphragm walls. This is followed by excavation to just below the roof slab level of the underground structure with the retaining walls and struts supporting the soil at the sides. The roof slab is then constructed providing a massive support across the excavation. Access openings on the roof slab are provided so that works thereafter could proceed downwards to the base slab level of the underground structure. Upon completion of the base slab the side walls are constructed and the intermediate struts are progressively removed. The access openings on the roof slab are then sealed and the ground is subsequently backfilled and reinstated. JJ TOP-DOWN CONSTRUCTION METHOD Completed Underground Structure The side walls are constructed upwards followed by removal of the intermediate struts. The access openings on the roof slab are then sealed. Reinstated Road After the underground structure is completed the soil is backfilled to the top strut level before the strut is removed. This is followed by completely backfilling the top of the underground structure and finally reinstating the surface areas. If you have any suggestions or feedback please call our .

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