摘要
港珠澳大桥东人工岛敞开段隧道侧墙属于超高长墙式大体积混凝土结构,且与底板分步浇筑,温度控制和裂缝控制技术难度较高。采用有限元对混凝土温度场进行了模拟计算分析,并根据墙体的结构特点,提出了采用冷水机降低混凝土拌制用水温度,采用循环冷却水控制墙体混凝土的温升,冷却水管间距从80 cm加密至30 cm等成套温控技术措施。结果表明,成套技术措施有效控制了敞开段隧道侧墙大体积混凝土的温度,大幅度降低了墙体应力集中区的开裂风险。
Side walls of the open tunnel in the east artificial island of Hongkong-Zhuhai-Macao Bridge is a very high and long-wall type mass concrete structure and the concrete is placed separately from the floor slabs, as a result, it is technically difficult for temperature and crack controlling. Concrete temperature field was analyzed by finite element method and, according to the structural features of the walls, a series of technical measures for temperature control were used including lowering the temperature of concrete mixing water with water-cooling- machines, controlling the temperatures rise in concrete walls by circulating cooling water, and changing the space between cooling water pipes from 80 cm to 30 cm. The results show that the mass concrete temperatures of the side walls were controlled effectively by the technical measures and the cracking risks in the stress concentration areas are reduced significantly.
作者
赵辉
谷坤鹏
陈克伟
ZHAO Hui;GU Kun-peng;CHEN Ke-wei(No.2 Engineering Co.,Ltd. of CCCC Third Harbor Engineering Co., Ltd, Shanghai 200122, China;CCCC Shanghai Third Harbour Engineering Academy of Science Co., Ltd, Shanghai 200032, China)
出处
《中国港湾建设》
2016年第7期21-25,共5页
China Harbour Engineering
关键词
港珠澳大桥
敞开段隧道
大体积混凝土
冷却水管
温度控制
裂缝控制
Hongkong-Zhuhai-Macao Bridge
open tunnel
mass concrete
cooling water pipe
temperature control
crack control
