After the large building which was constructed in shipyard is submerged on undersea piers,its weight will push the basic piers to go down clearly in the initial period.

• 船坞内制作的大型结构物浮运沉放到海底的支撑基础上之后,受其自重及基础强度等因素的影响,在其初期会有一个明显沉降过程;