【摘要】 深圳前湾过海隧道工程盾构始发竖井,直径18m,深28.54m,采用沉井法施工,水下混凝土封底,封底厚度4.5 m。属大体积混凝土施工,如何保质、保量、按期完成封底工作,是一个值得研究的问题。结合工程实际及相关计算理论,介绍了高水压海滩地层中盾构始发井井底水下大体积、大面积、封底混凝土施工技术。更多还原

【Abstract】 The diameter and depth of the launch shaft of Qianwan sub-sea shield-driven tunnel in Shenzhen are 18 m and 28.54 m respectively.The lauch shaft is sunk by means of open caisson method.During the sinking of the launch shaft,underwater bottom-sealing is conducted.With a thickness of 4.5 m,the concrete casting of the bottom-sealing construction belongs to huge-volume concrete casting construction.It is worthy to make study on the concrete casting construction so as to fulfill the bottom-sealing with high quality and as per the schedule.On basis of the actual conditions of the project and the relevant theoreatical calculations,the article presents the construction technology of the huge-volume and large-cross-section underwater concrete casting for the bottom-sealing of the launch shaft situated in coastal ground.更多还原