摘要
双壁钢围堰由于其具有稳定性好、可用于深水基础等优点,被广泛应用于大跨度跨海、跨江桥梁建设中。在双壁钢围堰壁舱内浇筑混凝土(或注水)以增加围堰重量,并在围堰内吸泥使围堰下沉至指定位置。本文以西江特大桥跨西江主桥双壁钢围堰在老黏土条件下吸泥下沉为研究背景,由于老黏土是一种超固结土,呈硬塑状态,在水中具有超强黏性,采用常规的吸泥方案和设备,难以将其吸出。通过改进吸泥方法和吸泥设备,并利用BIM技术模拟围堰底部吸泥情况,加快了钢围堰吸泥下沉速度。解决了双壁钢围堰在老黏土地质条件下下沉难度大、易倾斜等难题,可为类似深水基础施工提供参考。
The double-walled steel cofferdam is widely used in the construction of long-span cross-sea and trans-river bridges due to its good stability and application in deep water foundation. The concrete （or water injection）is poured in the bulkhead of the double-walled steel cofferdam to increase the weight of cofferdam, and the mud is sucked in the cofferdam so as to sink the cofferdam to the designated position. Taking Xijiang Bridge across its main double-walled steel cofferdam in the old clay geology as the background, as the old clay is a kind of over consolidated soil with a hard plastic state and has super viscosity in water, it is difficult to suck it out by adopting conventional suction scheme and equipment. By improving the mud suction method and the equipment, the BIM technology is used to simulate the suction condition at the bottom of the cofferdam, which speeds up the sinking rate of the cofferdam. Therefore, the difficulties on hard sinking and easy inclining of the double-walled steel cofferdam in the old clay geological conditions are settled. It can provide reference for similar deep water foundation construction.
作者
魏加志
Wei Jiazhi(China Railway 11th Bureau Group 1,t Engineering Co.Ltd.,Xiangyang Hubei 441106,China)
出处
《铁道建筑技术》
2018年第8期53-55,96,共4页
Railway Construction Technology
基金
中国铁建股份有限公司科技研究开发计划项目(16-B01)
关键词
老黏土
双壁钢围堰
吸泥下沉
BIM技术
old clay
double-wall steel cofferdam
sinking by sucking-mud
BIM technology
作者简介
魏加志（1973-），男，高级工程师，从事大跨度桥梁施工研究。
