钢扒杆“双钓鱼”架梁施工技术
2015-08-17卢红军
卢红军


摘要: 在山区架设桥梁,往往由于现场条件限制,架桥机或吊车无法到达施工现场,采用其他架梁方法架梁工作成本高、难度大。采用钢扒杆“双钓鱼”架梁具有设备投资少、经济效益明显,设备重量小易于调遣、安装 ,操作简单,不需要特殊的临时设施,不受架设墩台高度和孔下地基、河流、水文状态限制等优点,能有效弥补其他架梁方法的缺点。以广(安)南(充)高速公路瘦沟大桥空心梁板的安装施工为例,介绍了钢扒杆“双钓鱼”的原理、工艺流程、主要阶段受力计算。
Abstract: Building bridges in the mountains areas, often due to site conditions, bridge girder erection machine or crane cannot reach the construction site, and the cost of other girder erection methods and work is high and the construction is difficult. The steel derrick double angling girder erection has the advantages of less equipment investment, good economic benefit, easy disposal and installation of low weight equipment, simple operation, no special temporary facilities, not restricted by the erection pier height and foundation under the holes, rivers, hydrological state restrictions, etc., can effectively compensate for the shortcomings of other methods. Taking installation and construction of hollow slab of Shougou bridge in Guang'an-Nanchong Expressway an example, the principle, process and main force calculation of steel derrick double angling are introduced.
关键词: 钢扒杆;双钓鱼;架梁;施工
Key words: steel derrick;double angling;girder;construction
中图分类号:TU761 文献标识码:A 文章编号:1006-4311(2015)23-0081-03
0 引言
在山区架设桥梁,往往由于现场条件限制,架桥机或吊车无法到达施工现场,采用其他架梁方法架梁工作成本高、难度大。选用钢扒杆“双钓鱼”架梁方案,解决了瘦沟大桥沟深墩高,受地形限制,预制梁场及其存梁场狭小不利因素。与传统技术相比,此架梁方法不受架设墩台高度和桥孔下地基、河流水文状态的限制,不需要导梁、龙门吊机、汽车吊机等重型设备及可架设40m以下跨径的预制梁板。对比其他架设方法,新技术全套设备投入资金少,有效的降低施工成本。
1 工程概述
广(安)南(充)高速公路第A合同段瘦沟大桥为典型的山区桥梁工程,为上跨瘦沟而设,中心里程K6+040。该桥是本合同段的控制性工程。该桥位于半径R=1300m的右偏平曲线上,且在枣山立交变速车道内,其左、右幅半桥宽度分别为17.5m和14m。上部构造采用先张法预应力砼空心板梁。……
