特大斜拉桥塔柱索道管定位安装技术
2023-12-21罗元元闫荣刚吴春雷钟平
罗元元 闫荣刚 吴春 雷钟平



【摘 要】:针对斜拉桥主塔索道管定位时间长、精度低的问题,在清溪口大桥工程中,将传统的定位测量调整为放样定位,直接放样索道管固定点,再定位中心点;同时采用“三点定位法”进行索道管定位,将固定点、上下中心点同时放样出来,再进行中心点对正,施工中减少了校正次数。施工结果表明,该方法不仅大大提高了索道管的放样精度,也显著提高了施工效率。
【关键词】:特大斜拉桥;索道管;定位;塔柱
【中图分类号】:U448.27【文献标志码】:C【文章编号】:1008-3197(2023)02-16-03
【DOI编码】:10.3969/j.issn.1008-3197.2023.02.004
Positioning and Installation Technology of Stay-Cable Tube in Tower Column of Extra-large Cable-stayed Bridge
LUO Yuanyuan, YAN Ronggang, WU Chunlei, ZHONG Ping
(China Construction Bridge Co. Ltd., Chongqing 402200,China)
【Abstract】:Focusing on long time and low accuracy in the positioning of the cableway pipe of the main tower of the cable-stayed bridge, the paper uses the Qingxikou Bridge Project as example, adjusts the traditional positioning survey to lofting positioning through technical innovation, positioning is to set out the fixed points of the stay-cable tube directly, and then locate the center point. At the same time, the "three-point positioning method" is innovatively used to locate the stay-cable tube, the fixed point, upper and lower center points are set out at the same time, and then the center point is aligned, which reduces the number of corrections during construction. The construction results show that: it not only greatly improves the lofting accuracy of the cableway pipe, but also significantly improves the construction efficiency.
【Key words】:extra-large cable-stayed bridge; cableway pipe; positioning; tower column
隨着我国基础设施建设不断发展,斜拉桥以优越的跨越能力、优美的造型、良好的景观效果而备受青睐。但斜拉桥施工难度大,对预埋件的埋设精度要求较高;特别是由于直接关系斜拉桥主要受力构件斜拉索的安装精度及受力情况,索道管的安装精度要求极高[1]。
清溪口渠江特大桥为高低塔双索面斜拉桥,索道管在施工期间预埋到塔柱混凝土内,本文以该工程为例,对索道管的定位安装技术进行了革新。
1 常规定位技术存在的问题
常规的索道管定位放样利用索道管上下中心点定位的方式进行索道管定位安装。建立以承台中心点为中心,以平行于路线中心线方向为X轴,以垂直于路线中心线方向为Y轴,塔柱垂直方向为Z轴的空间立体三维坐标系[2];在CAD图形中取索道管上下中心点两个截面投影在XY平面上,确定两个中心点的X、Y坐标,以上下索道管中心点到XY平面的距离确定两个点的Z坐标,以此确定两个点的空间坐标[3~4]。……
