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近几年来,在国内外修建各种深基建筑物时,正在广泛使用泥浆套下沉沉井的施工方法。但是,沉井在重力作用下下沉时,经常发生偏斜及“悬空”现象,致使沉井塌陷,沉井内泥浆中断。上述情况说明,沉井在自重作用下下沉过程复杂,要使沉井均匀下沉是很困难的,特别是在不同的土壤中以及遇有漂石或其它粗粒夹杂物时就更加困难。
In recent years, at the construction of various deep-foundation buildings both at home and abroad, construction methods using mud-set sinking wells are being widely used. However, when the caisson is sunk under gravity, the phenomenon of deflection and “dangling” often occurs, causing the caisson to collapse and the mud in the caisson to break down. The above shows that it is very difficult for the caisson to sink under the action of dead weight, which makes it difficult to sink the caisson. It is even more difficult in different soils and especially in the case of boulders or other coarse-grained inclusions.