国内外桥梁拓宽方法及技术分析

Domestic and Overseas Bridge Dilated Measures and Technical Analysis

随着公路运输的快速发展,大量早期建成投入运营的公路桥梁,服务水平已明显降低,已成为公路运输线上的"瓶颈",不利于沿线经济的长期可持续发展。对原有公路拓宽改建,提高原有公路桥梁的使用功能,节约工程投资,是旧路改建工程通常采用的有效途径。虽然我国在桥梁加固改造上积累了相当的经验,但是还没有一个系统的桥梁拓宽改建规范,也没有在桥梁拓宽改建方面对于设计资质做出明确的规定,已有的旧桥改造设计大都是根据以往的设计经验所进行的,缺乏规范标准以指导生产实践。因此,旧桥的拓宽改建方法的探索总结具有重要的实际工程意义。

With the fast development of highway carrying, many road bridges were constructed and went into working in the early, service quality was clearly depressed, they have been the ＂bottleneck＂ of road carrying and went against the con- tinuanee development of economic along the line. Dilated the old road is the efficiency approach for rebuild project which improved the use function of road bridge and economized the project invest. Accumulating much experience for bridge reinforcemeat in China, so far a systemic criterion is not published and design aptitude is not clearly stipulated for dilated bridge, the existing rebuild old bridge is designed according to the ago design experience and lacked criterion standard to instruct operating practice. Therefore, summarizing the rebuild measure of dilated old bridge has importantly practice project significance.