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特别是随着国民经济的发展,早期建设的部分高速公路的通行能力已不适应社会经济发展的需求,需进行拓宽改造。拓宽改造设计时,很多设计采用拆除中小跨径桥梁上部结构,仅利用桥梁下部结构和基础的方案,增加了投资,浪费了资源,不符合绿色发展的理念。通过预制新板与加固利用旧预制板的计算分析及经济比较,说明旧板加固利用与预制新板承载力基本相同,满足桥梁承载力要求;每平米可节约直接费1000元,且保通方便、费用低,具有较高的经济效益和社会效益。
Especially with the development of the national economy, the capacity of some expressways built in the early stage has not met the needs of social and economic development and needs to be broadened and rebuilt. To broaden the design of transformation, many designs adopt the scheme of dismantling the superstructure of medium and small-span bridges and only utilizing the structure and foundation of the lower part of the bridge to increase investment, waste resources and not conform to the concept of green development. Through the calculation and economic comparison between the prefabricated new board and the reinforced old prefabricated board, the bearing capacity of the old board reinforced and prefabricated new board is basically the same to meet the requirements of the bridge carrying capacity; the direct cost of 1000 yuan can be saved per square meter, , Low cost, with high economic and social benefits.