黑龙江省最长高速公路桥梁完成主桥体系转换关键工序|欧美黑人又粗又大高潮喷水
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中新网哈尔滨11月22日电(记者 姜辉)22日,记者从黑龙江省交通运输厅获悉,日前,总重达1.17万吨的松花江特大桥主桥钢箱梁完美脱离顶推临时支架,顺利完成主桥体系转换关键工序,这一标志性进展不仅展现了黑龙江省在严寒地区桥梁建设领域的卓越技术实力,更标志着我国在寒区大跨度自锚式悬索桥建设领域取得的又一突破性进展。

作为东北三省一区范围内跨径最大的自锚式悬索桥、黑龙江省最长高速公路桥梁,哈尔滨都市圈环线西南环段松花江特大桥全长6.8千米,由黑龙江省建投集团及权属企业龙建股份公司承建,是串联哈尔滨新区、太平国际机场及肇东市等重要节点。该桥主桥跨度550米,单孔最大跨径300米,采用三跨双塔自锚式结构,主塔高96.44米,采用钢筋混凝土门式框架结构。

项目团队针对大跨度空间缆索夹角度调整难度大、大倾角索夹滑移风险高、吊索入锚难度大、张拉轮次多等难题,提前制定应对方案,围绕体系转换的荷载转移逻辑、重力释放过程及钢支墩支撑稳定性等关键环节反复推演模拟,并创新采用“跳拉法”进行吊杆张拉与主索鞍顶推作业,以非线性顺序同步实施吊杆张拉与主索鞍顶推。运用自主研发的智能缆索安装设备与液压同步顶升系统,精密控制吊索、斜拉索张拉过程,集成缆索智能检测功能的巡检装备全程监测桥梁健康状态,智慧工地指挥中心实时预警施工风险,以毫米级精度全程监控主缆、吊索等构件的线形、垂度、张力等参数变化,确保主桥上部结构荷载由临时支架平稳过渡至永久缆索系统,同步实现从临时支撑到永久受力体系的无缝转换。
目前,松花江特大桥完成整体进度92%,将全面进入主桥桥面混凝土铺装及附属设施施工新阶段。(完)
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