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摩天大楼勾勒城市天际线(砥砺奋进的5年・中国高度)
上海中心大厦
(来自网络)
初秋的北京天气褪去了燥热,透着些许清爽,朗日下天空瓦蓝,视野开阔。8月末的一个午后,笔者登上西山,向东远眺,偌大的北京城奔来眼底。东北方向,奥林匹克公园的玲珑塔与盘古大观并峙。视角南转移,中央商务区建筑群就跃入眼帘。一座高耸突兀的建筑取代北京国际贸易中心,勾勒出北京天际线的新高度,其旁边的中央电视台大厦已经显得不那么起眼。那座高耸的建筑就是正在建设的“中国尊”。透过办公室的玻璃窗,笔者近距离见证了它日渐“长”高、直上云天的过程。而当西山远眺之时,从另一个视角欣赏到它500多米窈窕的身姿如何向上擎起城市天际线。
城市向高空延伸,变得更“立体”是中国现代城市发展的一大趋势。530米的广州周大福金融中心、近600米的天津117大厦和深圳平安国际金融中心、632米的上海中心、设计高度636米的武汉绿地中心,这些不断改写高度纪录的建筑纷纷拔地而起。根据一项最新数据,中国目前已完工、高度在300米以上的建筑物达55座,在建设的有62座。
建设超高层建筑并不容易,需要实现很多建筑科技突破,可以说,众多超高楼宇如雨后春笋般生长,折射出的是中国在建筑设计、新型建设材料开发利用、建筑装备和施工领域取得的长足进步。每一座摩天大楼都诉说着感人的中国建筑科技的故事。
天津117大厦建设过程就是中国建筑科技的一次精彩跃进。2015年9月8日,伴随整车混凝土泵送出管至621米,117大厦超越上海中心大厦606米的混凝土泵送高度,刷新混凝土实际泵送高度吉尼斯世界纪录。一直以来,世界建筑界都在设法破解超高层建筑混凝土输送高度难题,“上得去、不堵管”是孜孜以求的目标,负责施工的单位集结了大批专才,加大科研投入,建造了“中国建筑千米级摩天大楼”混凝土超高泵送盘管模拟试验基地。通过反复试验,研究团队终于自主研发出“高性能聚羧酸外加剂”,有效解决了混凝土泵送高度高,高强混凝土粘度高、低强混凝土易分散、高层泵送混凝土流动性损失大、冬季抗冻性能要求高等专业技术难题,填补了高性能混凝土超高层泵送与技术领域中多项技术空白。
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