大跨度预应力混凝土桁架桥梁加固技术研究

Research of Strengthening Techniques for Long Span Prestressed Concrete Truss Bridges

大跨度下承式预应力混凝土桁架桥容易出现病害,以某下承式预应力混凝土桁架桥为例,在分析该桥病害原因的基础上,提出采用高强精轧螺纹钢对预应力竖杆加固的方案。加固后的检测及运营效果表明,该加固方案能够有效地提高桥梁的承载力,并具有施工效率高、造价低等特点。

The long span prestressed concrete(PC) through truss bridges are liable to deteriorations.By way of example of a PC through truss bridge and on the basis of analysis of the deteriorations of the bridge,the scheme of strengthening the vertical prestressed members by the high-strength finishedly rolled threaded bars is proposed.The inspection and operation of the bridge after strengthening show that the scheme can effectively improve the carrying capacity of such type of the bridges and has the characteristics of high construction efficiency and low construction cost.