变异形互通式立交布设控制因素分析

中铁第一勘察设计院集团有限公司,陕西 西安 710043

互通式立交; 总体布设; 线形指标; 桥梁工程; 路基工程

Analysis of controlling factors of the variant interchange
LI Rui

(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China)

interchange plans; general arrangement; route indexes; bridge engineering; subgrade engineering

DOI: 10.13800/j.cnki.xakjdxxb.2017.0319

备注

地形、地质情况复杂的山区高速公路在交通需求上与城市有很大差异,高速公路主线指标比较紧凑。通过石黔高速黑溪互通式立交实例,从立交总体布设、线形指标控制、桥梁布置、路基设置等多个方面对复杂山区非常规变异形互通式立交布设指标进行研究。研究认为互通式立交占地面积大,与山区用地条件的矛盾突出,常规的立交形式对地形、地质条件适应性差,需要对立交布设进行适当变异。复杂山区变异形高速互通式立交总体布置中,利用地形,绕避不良地质条件灵活布线,贯彻安全、舒适、经济的设计理念,立交范围主线及匝道的线形指标需结合桥梁、路基工程进行控制,主线及匝道桥梁工程设置应根据地形、地质情况、施工条件等采用各种墩台形式,注意孔跨及梁型的统一,路基工程应减少弃方,注重不良地质段落防护,路面结构指标需按照主线、匝道及桥面铺装分别选取。

The complex mountainous highways in the traffic demand with Terrain and geological conditions is also very different from the city, the main line indicators of highways are more compact. Based on the design example of the interchange of the Shiqian high-speed and Heixi interchange, from the aspects of the general arrangement of the interchange, the control of the route indexes, the layout of the bridge engineering and the setting of the subgrade engineering, the indexes of unconventional variability interchange of complicated mountainous areas are studied. The study shows that the interchange area is large, and the contradiction with the using mountain land are prominent. The conventional interchange form is poor adaptability to terrain and geological condition, and it is necessary to make appropriate variation for the interchange. In general arrangements of complex mountainous high-speed variant interchange, the terrain is used, bypassing bad geology, flexible wiring, and implementing safe, comfortable and economical design idea; the line index of the main line and the ramp should be combined with the bridge and the subgrade project to be controlled; the main line and the ramp bridge engineering should be based on terrain, geological conditions and construction conditions, using a variety of piers and forms, while paying attention to the unity of the spans and beam type; subgrade engineering should be reduced abandoned, and pay attention to bad geological paragraph protection; the pavement structure indexes should be chosen according to the main line, ramp and bridge.