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第一讲 冻结法凿井概述 一、冻结法凿井的实质和原理 冻结法凿井是在井筒开凿之前,用人工制冷的方法将井筒周围的地层冻结成封闭的不透水的圆筒——冻结壁,以抵抗地压和隔开地下水与井筒的联系,并在冻结壁的保护下进行掘砌工作的一种特殊凿井法。 为了形成冻结壁,预先在拟凿井筒外围按圆周布置一定数量的冻结孔,孔深略大于冻结深度,在孔内安装冻结器(由冻结管、供液管与回液管组成)。冻结站制出的低温盐水(-20～-30℃的氯化钙溶液)经去路
First, a summary of frozen sinking First, the essence and principle of freezing sinking method Frozen sinking wells in the wellbore prior to the artificial cooling method to freeze the formation around the wellbore sealed closed impermeable cylinder - frozen Wall to resist the pressure and separation of groundwater contact with the wellbore and excavation work under the protection of the frozen wall of a special drilling method. In order to form a frozen wall, a number of freezing holes are arranged circumferentially around the periphery of the quarrying shaft in advance. The holes are slightly larger than the freezing depth and a freezer (composed of a freezing pipe, a liquid supply pipe and a liquid return pipe) is installed in the hole. Freezing station made of low temperature brine (-20 ~ -30 ℃ of calcium chloride solution) by the way