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港珠澳大桥隧道最终接头安装成功 6月底或将贯通

2017-05-03 00:42:12   新华网

5月2日,“振华30”起重船从“振驳28”驳船上吊起重约6000吨的最后接头,准备放置到预定位置。新华社记者刘大伟摄

新华社广州5月2日电2日22时30分许,重达6000吨的港珠澳大桥沉管隧道最终接头在经过16个多小时的吊装沉放后,最终安装成功。至此,经过我国交通建设者6年多的持续奋战,世界最大的沉管隧道——港珠澳大桥沉管隧道顺利合龙。

2日5时50分许,随着港珠澳大桥岛隧项目部总经理林鸣下达施工指令,起重能力达12000吨的“国之重器”“振华30”的巨大主钩缓缓上升、转动,最终接头平稳吊离“振驳28”运输船,悬停在对接位置上空。在相继完成“脐带缆”连接,姿态调整,海洋条件、控制系统、基床回淤等情况复核确认后,最终接头缓缓入水。

随着最终接头逐渐下沉,阻水面积进一步增大,龙口区流速越来越大,操控难度愈来愈大。决策团队、施工团队、保障团队全力配合,控制着最终接头缓缓竖直沉放。10时许,最终接头没入水下。12时许,最终接头在28米深海成功着床。随后小梁顶推、结合腔排水等后续作业相继完成。22时30分许,经贯通测量,各项指标满足预控标准,最终接头安装取得成功。

港珠澳大桥是世界最长的跨海通道,6700米的海底隧道是大桥的控制性工程。其中沉管段长5664米,由33节巨型沉管和1个合龙段最终接头组成,最大安装水深超过40米,是我国建设的首条外海沉管隧道,也是世界规模最大的公路沉管隧道和唯一的深埋沉管隧道。

从2010年12月动工建设,至2013年5月完成首节沉管沉放以来,我国交通建设者先后克服深水深槽、强回淤、大径流等世界级技术难题,2017年3月7日顺利完成了全部33节沉管安装,距最终合龙仅差12米。

“最终接头的吊装是隧道建设的最关键一战,决定着沉管隧道建设的成败,也决定了港珠澳大桥建设的成败。”林鸣说,最终接头结构整体呈楔形,长12米,位于E29、E30沉管之间。受两侧沉管阻挡,龙口区海流流速显著增大,复杂的流场不仅增大了基床回淤和边坡冲刷的风险,同时也增加了最终接头下沉姿态控制的难度。

为节约工期,减少水下作业时间,保障施工安全,在3年多时间里,建设者们开展了40多项专题研究和数十次验证试验,召开了10余次风险分析会和100余次攻关专题会,创新采用了“三明治沉管结构”,在世界范围内首次提出并成功应用“陆上工厂预制、整体水下安装”的沉管隧道接头新工法,变水下施工为工厂预制和管内干施工。

“为保证止水效果,最终接头采用了精细化设计,两侧距已安沉管只有10多厘米,安装时一旦出现轻微的倾斜、摆动,都将给最终接头和沉管结构带来灾难性的后果。”港珠澳大桥总工办主任陈越表示,起重船船体巨大,受风、浪、流影响显著,施工海域富余水深有限,存在船舶搁浅或由于缆力不够冲撞沉管的风险,这也意味着对海洋环境要求更为苛刻。

港珠澳大桥管理局党委副书记韦东庆表示,最终接头吊装成功之后,将进行钢接头焊接、混凝土浇筑和基础注浆及管外回填等一系列工序,有望在6月底实现岛隧工程暨主体工程全线贯通。

责任编辑:穆启春 CN063
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