小梁距变高度小箱梁在宁波市北环快速路工程中的应用

平行匝道由于桥面较窄，通常的标准粱宽小箱梁较难直接应用。由于受道路纵断面布置的限制，匝道与主线并板处，道路竖曲线引起的预制梁起拱值可能较大，给预制小箱梁的制作带来一定困难。该文就以上问题，以具体工程为背景，讨论在实际设计中的解决办法，并给出了代表性的结构验算结果。

Application of Small Beam Spacing Variable Height Small Box Girder in Ningbo North Ring Expressway Project

The common standard beam width of the small box beam is harder directly to use in the parallel ramp because of the narrower deck.There is possibly greater rising value of arch of prefabricated beam caused by the highway vertical curve at the connection of ramp and the main line owing to the limit of the highway longitudinal sectional layout,which will bring some difficulties to the prefabrication of small box beam.Aiming at the above problems,the article discusses the solving methods in the practical designs,and gives the representative structural checking result.