单点连续顶推箱梁施工关键技术

京良路改扩建工程在主路K6＋931.664（3号墩）～K7＋046.664（7号墩），辅路K0＋706.823（3号墩）～K0＋821.823（7号墩）处上跨既有京广铁路，该上跨铁路桥为预应力混凝土箱梁，采用了单点连续顶推施工工艺。现今随着顶推施工技术的日益成熟，且其对既有铁路影响小，已经成为了上跨铁路采用较多的一种施工工艺。结合上跨京广铁路桥的具体施工步骤，详细论述了顶推施工中的关键技术。

Key Technology of Single Point Continuous Top Pushing Beam

Jing Liang Road Extension Project in the main road K 6＋931.664 （No.3 pier ） ~K7＋046.664 （No.7 pier ） , Fu Lu K0＋706.823 （No.3 pier ） ~K0＋821.823 （No.7 pier ） located across existing Beijing Guangzhou railway , the spanrailway bridge is a prestressed concrete box girder , using single pointcontinuous jacking construction technolo-gy.Nowadays with the jacking construction technology is increasingly mature , and push the construction technology of existing railway impact of small , has already become a kind ofconstruction technology to cross the railwayused more , through the con-crete construction steps of the cross bridge of Beijing Guangzhou railway , discusses in detail the push key technique in the construction.