单线铁路长大桥梁铁路架桥机架梁桥上T梁换装施工技术

Construction Technology of Changing Clothes T-beam on Bridge with Frame Beam for Railway Bridge Erection of Long-Span Bridges on Single Track Railway

目前,我国现行200千米以下铁路桥梁一般为简支T梁结构,采用铁路架桥机架梁和倒装龙门吊换装T梁方式时,为保证架梁施工效率,一般倒装龙门吊至架桥机距离控制在2千米以内,但是单线桥梁受梁面宽度较小和梁体翼缘板不能承受较大载荷等因素的影响,往往超过2千米以上的长大桥梁无法实现桥上T梁换装,大大降低了施工效率,如何解决这一施工难题是一个值得研究的课题。本文结合新建和若铁路依木拉克特大桥架梁施工,根据单线简支T梁和龙门吊的结构形式以及倒装T梁时的受力分析,采取了在T梁上加装龙门吊专用底座,再将龙门吊支立在龙门吊专用底座上的方式有效地解决了这一难题,不仅大大提高了架梁施工效率,而且有效保证了架梁施工安全,为类似施工提供了借鉴和参考。

At present,the railway bridges below 200 km in China are generally simply supported T-beam structure.When railway bridge erecting frame beam and inverted gantry crane are used to replace T-beam,to ensure the construction efficiency of girder erection,the distance between the inverted gantry crane and the bridge erecting machine is generally controlled within 2 km.However,the single track bridge is affected by the factors such as the small beam width and the beam flange plate that cannot bear large load.The long bridge more than 2 km cannot realize the T-beam replacement on the bridge,which greatly reduces the construction efficiency.How to solve this construction problem is a topic worthy of study.This paper combines with the construction of the extra-large bridge girder of Yimulak on the newly built Hetian Ruoqiang railway.According to the structural form of single track simply supported T-beam and gantry crane and the stress analysis of inverted T-beam,the special base of gantry crane is installed on T-beam,and then the gantry crane is erected on the special base of gantry crane,which effectively solves this problem.It not only greatly improves the efficiency of beam erection construction,but also effectively ensures the safety of beam erection construction,which provides the reference for similar construction.