广州南站高架候车层大型预应力钢筋混凝土楼盖设计与施工

DESIGN AND CONSTRUCTION OF LARGE PRESTRESSED REINFORCED CONCRETE ROOF OF OVERHEAD WAITING FLOOR OF GUANGZHOU SOUTH RAILWAY STATION

广州新南站高架候车层的钢筋混凝土楼盖面积大,属大型钢筋混凝土楼盖,高架候车层楼盖采用"跳仓法"施工技术,将混凝土的变形通过"先放后抗"的方法,实现了"抗放兼施,以抗为主"控制混凝土裂缝的目的。设计采用部分预应力钢筋混凝土梁,部分预应力钢筋混凝土设计与"跳仓法"施工技术的结合,使高架候车层楼盖在使用过程中处于合理的工作状态。高架候车层混凝土楼盖浇筑完毕至今未见裂缝,达到了预期效果。

The roof of overhead waiting floor of Guangzhou New South Railway Station is a large reinforced concrete roof. ＂Alternative bay＂ technique is used in construction of the roof of overhead waiting floor and concrete crack is effective controlled through ＂release before resistance＂, where resistance is the emphasized. Partial prestressed reinforced concrete beam is combined with ＂alternative bay＂ construction technique to control the roof of overhead waiting floor under reasonable working condition. No crack is detected after pouring of the concrete roof of overhead waiting floor and the expected effects are successfully realized.