跨越既有铁路桥梁方案设计研究

随着铁路建设的快速发展,与既有铁路线交叉的情况越来越多,同时对既有线的运营安全重视程度日益增加,因此跨越既有线时的设计方案逐渐成为关注重点,结合兰州—中川铁路设计情况,对跨越既有铁路线的桥梁方案进行研究,除采用传统的预应力混凝土盖梁门式墩、钢盖梁门式墩等设计方案外,根据实际情况首次提出预制拼装组合新型门式墩方案、倒L形墩方案、转体V形T构桥墩方案等一些新的设计思路,不仅节约工程投资、保证施工工期,同时又大大减少新线施工对既有线运营影响及后期的养护维修工作,经济和社会效益显著。

Research on Design Schemes of Bridges Crossing Existing Railway

With rapid development of railway construction,crossing existing railway gets more frequent and the operation of existing railway runs risk of safety. Thus,the design for successful crossing of existing railway is becoming the focus. With reference to the design of Lanzhou-zhongchuan railway,the bridge schemes for crossing existing railway are studied in this paper. In addition to the traditional prestressed concrete coping portal pier and the steel coping portal pier,some new design concepts are first proposed according to the actual situation,such as the schemes of precast concrete portal pier,inverted"L" pier and rotation construction V-shaped T-frame bridge pier. These schemes not only save engineering investment,guarantee construction progress,but also greatly reduce the impact of new line construction and the post maintenance works on the existing railway operation with good economic and social benefits.