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探访海口马路下面的“世界”之三:地下管廊怎么建

2017-08-11 13:48:54   中国青年网

海口管廊施工已研制成功多种新式工法,图为U型敞口式盾构技术,填补了国内U型盾构在管廊施工中的空白。 王子谦 摄

中新网海口8月11日电 (记者 王子谦)深居下地纵横交错的地下综合管廊,犹如一根根动脉将承担起城市的输电、通信、燃气、供水等重担,建设管廊也成为海口的“百年工程”。

海口市管廊试点项目被列为国家第三批PPP示范项目,由政府与中标社会资本方中铁四局集团组成联合体,负责项目的投融资、建设和运营管理。

海口地下管廊项目于2015年10月开工,由中铁四局集团负责建设。中铁四局海口地下综合管廊项目部书记富腾介绍,此前地下管廊施工采用传统施工工艺,即木制模板拼接和浇筑,施工效率不高,海口管廊目前已研制成功多种新式工法,提高效率,确保施工质量。

在管廊施工中,施工方根据结构特点,可提前在厂房中先期标准化生产构建,提高建设效率。 王子谦 摄

在施工中,中铁四局采用管廊预制技术进行施工。中铁四局海口地下管综合管廊预制厂项目经理高习明介绍,施工方根据管廊结构特点,科学拆分成外墙、中隔墙、顶板等构件,通过在厂房中先期标准化生产,现场采用吊车等设备安装这一新工艺,使得管廊施工提速至少20%。

图为在管廊中施工的一线建设者。 钟欣 摄

海口地下管廊施工还创造性地使用U型敞口式盾构技术,填补了国内U型盾构在管廊施工中的空白。在海口椰海大道施工现场,一个巨大的白色机器引人注意。中铁四局四公司海口管廊第三项目部项目经理安刚建介绍,这台U型盾构机长12.8米,宽9.2米,高4.92米,其在推进、出土、衬砌拼装等工序可实现自动化、智能化和施工远程控制信息化操作,与普通明挖顺筑法施工相比,可减少人工50%,节省费用40%,缩短工期30%。

海口管廊还采用了内模台车技术。中铁四局集团第一工程有限公司海口地下管廊项目经理部工程部何志祥介绍,该技术直接省去了传统支架和内模的拆搭作业,同时将外模塑料模板与特制背带组合成整体,形成大块整体吊装、安装,实现了无拉杆施工作业,避免了后期墙体渗水的隐患。

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