不间断交通高速公路拓宽跨线桥拆除施工技术

Construction Technology of Overpass Bridge Demolition during Expressway Widening in Uninterrupted Traffic

高速公路拓宽必将涉及跨线桥拆除重建问题。针对高速公路拓宽工程要求边通车边施工的复杂环境条件下,提供一种安全、有效的跨线简支梁桥无损静力拆除方法。根据不间断交通要求和具体跨线桥结构,确定拆桥分跨顺序、防撞护栏分块切割、主梁切割吊运方案。同时根据拆桥顺序,对桥下高速公路实施必要的交通限制,通过左右幅分幅封道借道通行等交通转换,保证了桥下通行和施工双安全,可为同类工程提供有益借鉴。

The expressway widening will certainly involve the demolition and reconstruction of overpass bridges. Under the complex environmental condition of expressway widening project to be required to construct while open to traffic, a safe and effective undamaged static demolition method of overpass simple-supported beam bridge is proposed. Based on the uninterrupted traffic requirement and the detailed overpass bridge structure, the scheme of determining the bridge demolition sequence by spans, cutting the crash barrier by segments and cutting and hoisting the main beam is proposed. At the same time, based on the sequence of bridge demolition, it is necessary to implement the traffic limitation for the expressway under the overpass bridge. The traffic conversion of closing the right and left lanes and tailgating traffic can guarantee the both safety of traffic under bridge and construction, which can be referred for the similar projects.