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武汉光谷广场综合体主体结构封顶 建成后日均可通行40万人次

2017-08-26 12:15:48   中国青年网

武汉光谷广场综合体主体结构封顶 建成后日均可通行40万人次

人民网武汉8月26日电 25日,集轨道交通工程、市政工程、公共空间于一体的5线交汇地下市政工程,武汉轨道交通2号线南延线光谷广场综合体主体结构南北区最后一块顶板混凝土完成浇筑。建成后,将会实现地铁2号线南延线、11号线、9号线三条地铁换乘,2条公路隧道交汇,以及综合利用隧道上部空间设计的地下公共空间,地下日均人流量可达40万人次。

4项分类构筑超级工程 各类设计瞄准世界一流

工程涵盖市政项目超级多:包含3条地铁线路的4座车站和区间,2条公路隧道,1条非机动车地下过街环道,以及综合利用隧道上部空间设计的地下公共空间工程,保障各型交通在这个国家级高新区交通节点顺利通行。

立体交叉空间布局超级复杂:巧妙地在三层空间内解决五线交汇,设置贯通的地下一层作为地铁换乘和交通层,简单便捷的实现逃生疏散、消防防灾,同时与周边商业互相联通;将9号线站台与鲁磨路隧道置于地下一层换乘大厅夹层,形成一种独特的地下大厅高架站台的空间布局。

地铁车站跨度超级大:工程主体为直径200m圆形,基于五线交汇,采用了大净空、大跨度结合地下中庭、下沉广场等空间形式,主体工程采用连续15米+最大26米跨度结构。

地下空间消防排烟窗超大:地下空间体量巨大,地下一层建筑面积达3.2万平米,通过在顶板设置自然采光天窗同时兼做自然排烟的排烟窗,在改善室内光环境和通风换气的同时,用于紧急情况下的消防排烟。

多项工艺工法填补国内空白 巨无霸工程施工量难以想象

桩基数量是普通房屋的40倍。一栋普通住宅的桩基大约是50根,而光谷广场综合体中心圆盘区有近2000根钻孔桩,是普通住宅的40倍。一方面是由于工程体量巨大,另一方面是为了克服地下破碎带的地质难题。此外,该工程对桩基质量要求高,按照规范垂直度充许误差为1%,实际执行中,误差率在三百分之一,能有效防止侵限而影响结构侧墙受力的发生。

开挖土方相当于20个普通地铁站。光谷广场综合体工程总建筑面积约16万平米,基坑平面面积近10万平米,在开挖中有2个特点:一是蝴蝶形的异形深基坑,与一般的矩形或者长方形基坑相比,安全风险大,受力控制难度成倍增加;二是基坑深度达34米,相当于往地下挖一个11层楼高,整个工程土方开挖量180万方,相当于20个标准地铁站的量。

爆破工艺填补国内空白。该工程基坑内临时混凝土支撑体系接近2万方、最大支撑梁长达100余米、砼方量大、净空高、拆除难度大,传统的拆除方式不能满足现场工期及安全文明施工的要求。探索采用孔内高段位、孔外低段位的微差延期起爆技术,并采用双雷管传爆,确保传爆网路的可靠性,至少节约工期6个月。

建成后地下日均人流量可达40万人次 大大缓解地面人流

据武汉地铁集团建设事业总部副总经理郑光辉介绍,综合体建成投入使用后,高峰期日均可通行人流40万人次。与此同时,2条从综合体穿越而过的公路隧道对缓解目前光谷的道路拥堵,特别是转盘处的拥堵起到了关键性的作用,珞喻路隧道让车辆经过光谷核心区时,从地下直穿而过;通过东湖隧道到鲁磨路的车辆可通过鲁磨隧道直达民族大道。(肖璐欣 袁永华)

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