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社评“欧美肥逼”-梳理天下新闻

广州南沙明珠湾欧美肥逼区跨江通道首段沉管管节浇筑完成

来源: 金羊网
2024-12-19 22:42:03

最佳回答

“欧美肥逼”广州南沙明珠湾欧美肥逼区跨江通道首段沉管管节浇筑完成

  中新欧美肥逼网广州12月18日电 (记者欧美肥逼 程景伟)12月17日晚上,经过49个小时的连续施工,由中铁隧道局承建的广州南沙明珠湾区跨江通道工程(首期段)(以下简称“跨江通道首通段”)完成首段沉管管节浇筑。

广州南沙明珠湾区跨江通道工程(首期段)完成首段沉管管节浇筑。中铁隧道局 供图

  在沉管管节浇筑现场,4辆泵车和60辆混凝土搅拌车同时作业,2辆天泵车从上自下精准浇筑混凝土,2辆地泵车稳扎地面、全力将混凝土泵送入底板。工人们穿梭其间,紧盯着各环节,全力保障浇筑作业有序推进。

  据了解,跨江通道首通段全长约1.08千米,其中沉管隧道长305米,下穿南沙横沥水道,连接上横沥水道南、北岸,全程设置3个管节。其中ES1-1号管节分6小节进行浇筑,本次完成浇筑的是ES1-1号管节中的2号小节,长15.5米、高9.5米,断面尺寸宽36.1米,混凝土浇筑量约2000立方米。

施工现场。中铁隧道局 供图

  本次沉管浇筑采用全断面一次浇筑成型技术,与传统整体式沉管隧道预制采用的横向分部、纵向分段的浇筑方式相比,这项技术不仅能显著减少沉管施工缝的数量,还能防止二次漏水,有效提高施工质量和效率。

  沉管管节浇筑工程对混凝土性能要求极高。此次沉管浇筑采用的是高性能混凝土,具有高流动性、高耐久性、高稳定性等优势,在泵车输送时可顺利填充沉管各部位,在水下也能抗水流冲击、保持结构稳定,有力确保了沉管的密实度与强度。

  据介绍,沉管浇筑工程中存在诸多挑战,其中天气就是一项,温度变化极易导致混凝土内部温度波动,进而引发开裂。为应对这一挑战,项目团队未雨绸缪,引入大体积混凝土温控机应对难题。该设备核心在于冷却循环机制,当温控系统一旦监测到混凝土内部温度异常,无论是骤升还是骤降,都可以人为地对循环冷却水进行动态控温,将混凝土内部与冷却水的温度稳定在25摄氏度左右。

  据悉,明珠湾区跨江通道工程建成后,将缩短广州南沙灵山岛尖至横沥岛尖核心商务区的通行时间,直接连通大湾区科学论坛永久会址与国际金融论坛会议中心,为粤港澳大湾区互联互通和经济发展注入新活力。(完)

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