高速铁路简支梁空心墩墩型比选分析

Comparison of Hollow Pier Shape of Simply Supported Bridge on High-speed Railway

越来越多高达20～60m的空心高墩被应用在山区高速铁路实际工程中,空心高墩的设计逐步成为了研究重点。为了研究出常用空心墩墩型的优缺点和适用范围,以及为山区高速铁路的空心墩墩型提供较大的选择空间,文章结合《时速350公里客运专线铁路双线空心墩部颁通用图》的编制工作,对圆端形和矩形2种墩型的5种方案桥墩的景观合理性、工程量、刚度控制及施工合理性、实用性等方面进行比选:(1)圆端形截面,墩身同一坡度(不分节);(2)圆端形截面,墩身坡度分节,墩顶采用同一尺寸;(3)矩形截面,墩身同一坡度(不分节);(3)矩形截面,墩身坡度分节,墩顶采用同一尺寸;(4)矩形截面,墩身坡度分节,墩顶采用同一尺寸;(5)矩形截面,墩身坡度分节,墩顶纵向尺寸根据不同墩高范围而不同。总结出高速铁路空心墩设计的规律。矩形墩较圆端墩节省工程量且模板导用率高,但适用范围较小。

As more and more hollow piers with a height of 20 -60 m are adopted for bridges on high-speed railway in mountainous area, the design of high hollow pier becomes an emphasis in the study. In order to study advantages and disadvantages and range of application of the common high hollow pier shape and provide a rich field of choices for hol- low pier shape for bridge on the high-speed railway. A comparison has been made on rationality of landscape, quantities of works, stiffness control, construction rationality and practicability of the following five schemes of round end pier and rectangular pier in combination with preparation of standard drawing for hollow pier for bridge on 350km/h double-track passenger dedicated line ： （ 1 ） round end section, the body of the pier is located in the same gradient （ non-segmented ） ; （2） round end section, the body gradient of the pier is segmented and the sizes of the pier tops are same; （3） rec- tangular section, the body of the pier is located in the same gradient （ non-segmented ） ; （4） rectangular section, the body gradient of the pier is segmented and the sizes of the pier tops are same ; （ 5 ） rectangular section, the body gradient of the pier is segmented and the longitudinal size of pier top is different depending on scope of the pier height . This pa- per summarizes the rule of design of hollow pier for high-speed railway. The rectangular pier is less in quantities of works and higher in usage rate of formwork than round end pier, but the range of application is less.