对行车干扰大、地质条件差铁路框架桥顶进技术的探讨

EXPLORATION ON JACKING TECHNIQUE OF RAILWAY SKELETON FRAME BRIDGE UNDE RINTENSIVE TRAFFIC INTERFERENCE AND ADVERSE GEOLOGIC CONDITIONS

框架桥顶进在既有线施工中是较常见的一种施工方式 ,已经在铁路工程施工中广泛应用。本文讨论的是在京广线行车密度大 ,速度快对工程施工干扰大 ;在既有河道中施工 ,地下水压大以及桩施工中有流砂等的不利地质条件 ,并有交叉渡线的不利条件下 ,纵抬梁的受力情况复杂 ,纵梁跨度大情况下的施工过程处理 ,以便给地质条件差、受力情况复杂条件下的工程施工提供一点经验 ,给既有线的施工安全提供借鉴。

Skeleton frame bridge jacking method is a frequently adopted practice in the construction of existing railway lines. It has been exte nsively applied in railway engineering construcion. This thesis probes into the treatment of engineering process on the Beijing-Guangzhou Railway, for which th e longitudinal uplift girder is under the complicated pressure conditio n and with great span. The construction on the Beijing-Guangzhou Railway is under such unfavorable conditions: great interference from the inten sive traffic and high speed of trains, adverse geologic conditions in terms of t he high subterranean water pressure in constructions on existing river channels and the drift sand interference in pile constructions, etc, and the difficulties with intersected trackages. The thesis is supposed to provide some experiences on the engineering construction under adverse geologic conditions and complicate d pressure status, and serve as a reference for safety management for the constr uction on existing railway lines.