在我国目前最大的公路立体交叉桥——北京西直门立交桥施工中,我们首次采用喷洒聚氯乙烯新工艺养护混凝土,取得了较理想的效果。栏杆、桥面、桥墩棱角刚劲,线条分明,光滑美观,质量完全符合设计要求。这种养护法设备简单、操作方便,只 In the construction of the Xizhimen Overpass Bridge, the largest highway three-dimensional crossover bridge in China, we have used the new PVC spraying technology to preserve concrete for the first time and achieved satisfactory results. The railings, bridge decks and bridge piers are stiff, with clear lines, smooth and beautiful appearance, and the quality is in full compliance with the design requirements. This conservation method is simple and easy to operate, only