扩建公路工程现浇梁施工技术

同三高速公路中哈达密河大桥为旧桥扩建工程，新建桥孔部分延伸至旧路路基边坡内，部分上跨既有公路，结构相对复杂多变。介绍了现浇预应力混凝土连续箱梁的结构、支架设计及施工、现浇梁施工措施等。实践证明采用的施工方案经济可行，既节省了支架投入，又解决了新建大桥与老桥不同长、与下穿公路夹角小造成门架跨度过长等问题，且结构质量和安全性均得到有效保证，且不影响既有路的通行，可为类似工程提供借鉴。

Construction Techniques for Cast-in-place Girders of Highway-Expanding Projects

The Hadami Bridge of the Tong-San Expressway is an existing bridge-expanding project.Its structure is relatively complicated,with part of the new spans extending into the side slope of the existing roadbed,and part of the new spans flying over the existing road.With the bridge as a practical example,the structure of the continuous cast-in-place prestressed concrete box girder,the design and construction of the trestle,cast-in-place girder construction measures,etc.are introduced in the paper.It is proved in...