深水无覆盖层基岩双壁钢围堰施工关键技术研究——以常益长铁路资水特大桥为例

Research on Key Construction Technology of Double-wall Steel Cofferdam in Deep Water without Covering Strata——Taking Zishui Bridge on Changde-Yiyang-Changsha Railway as an Example

文章以常益长铁路资水特大桥为研究对象,对深水无覆盖层基岩双壁钢围堰施工关键技术进行研究,提出在钢平台、双壁钢围堰施工前预先对河床底部进行水下爆破,由清渣船清除渣石,开挖完成后,扫描开挖后的基坑尺寸及基底标高,解决了无覆盖层岩层裸露的深水基坑围堰施工等难题,保证了桥梁工程的顺利实施。

Taking Zishui Bridge on Changde-Yiyang-Changsha Railway as the research object,this paper studies the key construction technology of double-wall steel cofferdam in deep water without covering strata.It is proposed that underwater blasting should be carried out at the bottom of river bed before the construction of steel platform and double-wall steel cofferdam,and slag should be removed by slag cleaning ship.After the excavation is completed,the size and base elevation of foundation pit after excavation are scanned,and the problems of exposed deep-water foundation pit cofferdam construction without covering strata are solved,which ensures the smooth implementation of bridge engineering.