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随着国民经济的发展,铁路行车速度的提高,既有铁路线上的平交道口的安全问题日益突出。因而要求将平交道口改为立体交叉的处所越来越多。在平交道口改为立体交叉工程的设计、施工与运营之间的矛盾逐渐突出。部分问题对于工程的施工质量与安全有一定的影响。现就以下几个问题谈点意见,望同仁斧正。一、关于顶进箱桥容许误差问题《铁路桥涵施工规范》第13.2.11条规定:框架桥涵顶进容许误差:1.中线误差:桥涵从两端顶进容许偏离10cm,从一端顶进容许偏离20cm;2.高程误差为顶程的1%;但偏高不得超过15cm,偏低不得超过20cm。此条规定适用于单节箱桥顶进施工,如果两节或多节箱桥顶进施工则不够严密。例如:两节箱桥从两端对顶,虽然每节箱桥中线偏离均不超过10cm,但偏离方向相反,则两节相对接口左右错牙可达20cm;同样若两节箱桥
With the development of the national economy and the increase of the speed of railway traffic, the safety of the level crossing on the existing railway lines has become increasingly prominent. As a result, more and more places are required to change the level crossing to a three-dimensional crossing. In the crossroads into three-dimensional cross engineering design, construction and operation of the conflict between the increasingly prominent. Some problems have a certain impact on the construction quality and safety of the project. Now talk about the following questions, hope my colleagues are positive. First, on the advancing box bridge tolerance error “Railway Bridge Culvert Specifications” Article 13.2.11 stipulates: frame bridge culvert allowed permissible error: 1. Centerline error: Bridge culvert from the two ends of the allowable deviation from the 10cm, from one end of advancing allow Deviate from 20cm; 2. elevation error of 1% of the top; but the high shall not exceed 15cm, low not more than 20cm. This article applies to single box bridge jacking construction, if two or more section box bridge jacking construction is not tight enough. For example: two boxes from the top to the top of the bridge from both ends, although each section of the bridge center line deviation of not more than 10cm, but deviate from the opposite direction, then the two relative interface about the wrong tooth up to 20cm; Similarly,