研究目的：研究顶板横向预应力钢束对箱梁横向计算结果的影响，给箱梁结构设计提供借鉴和帮助。
Research purposes: This paper analyzes the effect of the lateral prestressing tendon in top deck on the lateral calculation result of box beam.
同时，对单向悬臂浇筑施工桥梁合拢梁体的预应力体系转换和临时体外预应力束的布设原理做了阐述。
The conversion of the prestressed system and the layout of the temporary external prestressed tendons for the joined sections of the bridge are also expounded.
理论计算及工程实践表明本连续梁式架空轨束梁的设计计算方法可靠，连续梁架空方式是提高轨束梁架空跨度的有效方法。
The practical construction results show that the computation theory of this rails beam is credible and this rails beam is a good method to enhance rail's span in the crossing site.
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