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<../div><div class="cle"><../div> <div class="container">  <div class=" wid_970 text_l"> <div class="posatino fl mar_t_10"><a href="..../">首页<../a> > <a href="....../news../">资讯<../a> > <a href="....../news../11-1.html">行业动态<../a><../div> <div class="cle"><../div> <div class="content fl mt10 mb10"> <div class="w660 fl mr10" id="w600"> <div class="zixun-detail mb10"> <div class="article">高铁施工再创新技术！万吨裸塔成功转体90°<br><../div> <div style="text-align:center; line-height:24px; padding-bottom:10px;">http:../../www.chinafengji.net <span style="margin:0 15px;">2020-07-15 14:15:47<../span> <span class="red">科技日报<../span><../div> <div class="lh24"><p>　　国家“十三五”重点建设项目、我国首条跨海高铁，即新建福厦高铁迎来重大节点。7月8日凌晨，高85.5米、重逾万吨的新建福厦高铁木兰溪特大桥主塔，随着塔基1.2万吨的球铰逆时针缓缓旋转，历时1小时23分钟，顺利完成90°转体，安全顺利到达指定位置。<../p> <p>　　转体法施工技术，是指将桥梁结构在非设计轴线位置浇注或拼接成形后，通过转体就位的一种施工方法。<../p> <p>　　转体法施工将在障碍上空的作业转化为岸上或近地面作业，可使桥梁施工克服地形、交通、环境等条件制约，节省工程造价、缩短建设工期，同时保证施工过程的安全可靠。“以往大桥主塔转体施工，均为带梁转体，平衡较易掌控。采用裸塔转体施工技术，新建福厦高铁木兰溪特大桥为国内铁路建设首次。”中铁十六局项目负责人樊国良说。　　　　木兰溪特大桥全长18745米，是全线重难点及控制性工程之一。主桥设计为预应力混凝土主梁独塔双索面斜拉桥，双线无砟轨道、两个连续145米单跨。主塔状似“花瓶”。<../p> <p>　　木兰溪特大桥主塔转体为何要采用裸塔转体施工技术？<../p> <p>　　“新建福厦高铁行至莆田市木兰溪河畔，有15公里与既有杭深铁路线平行，上跨分幅(上下行分路)沈海高速公路。”中铁第四勘察设计院集团有限公司(铁四院)项目设计负责人杨恒说，木兰溪特大桥主塔左侧紧邻杭深铁路线，转体前相距13.5米，完成90°转体后相距仅6米，而塔高则仅比杭深铁路线桁架桥高40米。<../p> <p>　　一边是施工面积十分逼仄，一边是大桥主塔体量庞大。为确保现场施工作业和铁路邻近营业线安全，木兰溪特大桥主塔无法采用已有的带梁转体施工方法，只能大胆尝试裸塔转体施工技术。<../p> <p>　　“85.5米的主塔，转体高度为48.2米，重心高，平衡非常难控制。也因为场地狭小，不能使用机械平衡臂。”樊国良说。<../p> <p>　　如何在螺蛳壳里做道场，让“花瓶型”主塔顺利转体？<../p> <p>　　为保证施工安全，国铁集团、中铁第四勘察设计院和中铁十六局项目部多次进行技术分析，对方案进行优化和分解，决定采用侧位现浇平转法施工工艺，主塔采用全封闭液压爬模进行施工，在“原位现浇”基础上进行了优化设计，大幅降低了涉铁施工安全风险。<../p> <p>　　“花瓶型”主塔施工被分解成三个部分。下塔柱及下横梁采用支架现浇施工；中塔柱和部分上塔柱采用液压爬模法现浇施工；当上塔柱施工到一定高度时，将桥塔转体约90°。<../p> <p>　　“转体90°到位后，进行球铰混凝土固结，最后上塔柱，直至封顶。”樊国良说，为保证转体过程中主塔的平衡和稳定，在无“平衡臂”辅助下安全、准确的完成转体，项目部技术人员在安装球铰时，将精度严格控制在0.5毫米以内。同时为保持主塔平衡，施工过程中严格控制主塔顶部物品对称堆放、液压爬模同步爬升和混凝土的平衡浇筑，确保主塔成型姿态。<../p> <p>　　据科技日报记者远程视频观察，完成转体后的主塔，距即有杭深铁路线净距离6米，仅能并排塞下3辆奥迪A4。<../p> <p>　　专家表示，木兰溪特大桥主塔采用的裸塔转体施工技术，丰富了高铁桥梁施工技术，也为后续类似项目设计及建设积累了宝贵经验。<../p> <p>　　新建福厦高铁北起福州站、南至漳州站，全长277.42公里，设计时速350公里，是八纵八横东南沿海铁路重要通道，也是福建省内第一条真正意义上的高铁，全线计划于2020年底通车。 <../p> <div class="mt30" style="text-align:center;"><img src="http:../../www.cndoornet.com../ui../images..../news../tth_jx.jpg"../><../div> <div class="mt30" style="text-align:right;"><a href="javascript:window.print();">【打印】<../a> <a href="javascript:window.close();" class="mr10 ml10">【关闭】<../a><../div> <../div> <div class="keyword">文章关键字： <a href="....../news../tag--1.html" target="_blank"><../a><../div> <../div> <div class="w325 fl mr10"> <div class="border-g"> <div class="title"> <div class="title2"><span class="fr"><a href="....../news../12-1.html">更多<../a><../span>企业新闻<../div> <../div> 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