60kg/m 42号单开有砟道岔既有线插入施工关键技术

Key Construction Technology of 60kg/m No.42 Single Ballasted Turnout Inserted into Existing Line

文章以贵广铁路施工Ⅰ标老罗堡线路所2组1/42有砟单开道岔为例,采用侧位拼装整体推移插铺方案技术,研究总结了大号码道岔区间插入施工技术和工艺;插入施工的关键技术主要有:采用侧位拼装整体推移插铺方案;研制道岔钢轨件吊卸组合桁架,实现了道岔长大钢轨件的卸车作业;研制的尖轨区及辙叉心起道用辅助桁架,解决了液压高程起道机无法在1/42道岔长尖轨、长辙叉心直接安设的技术难题;用绝缘轨距拉杆提高道岔整体刚度;分级控制道岔轨排拨接量,保证道岔轨排拨接过程有良好的平顺性和到位精度;测设轨道控制桩网,施工时分段使用,达到控制道岔轨排横移到位精度;为防止道岔横移过程中滑轮倾覆,采用组合滑轮等技术,取得了较好效果。

Taking Laoluobao 1/42 ballasted single tumout of construction section I of Guiyang- Guangzhou railway as an example, by adopting the mature process and technology of lateral assembly integral movement and inserted laying, the construction technologies of large-size turnout inserted into the interval is stduied and concluded, which mainly include： adopting the scheme of lateral assembly integral movement and inserted laying; developing the turnout rail part slinging and unloading composite truss to realize the unloading operation of the long rail part of turnout; developing the auxiliary truss for track lifting of switch rail area and frog center to solve the technical problem of hydraulic elevation track lifting jack unable to be installed directly in long switch rail and long frog center of 1/42 turnout; adopting Insulation gauge tie rod to improve the integral rigidity of the turnout ; hierarchically controlling the lining and joining quantity of track panel of switch to ensure the good ride and position accuracy in lining and joining process of track panel of switch ; setting-out the track control pile net and using sectionally during construction to control the traverse moving position accuracy of track panel of switch; and using composite pulley technology to prevent pulley from overturning during switch traverse moving process with good results achieved.