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应用冻结法在沉井周围形成冻结帷幕,在下部地层寻找能防止地下水渗透的隔水层,两者共同形成封闭的筒状体,能够保证沉井施工区域内地下水与外界的完全隔离,达到四周松散层不垮塌的目的。通过在某雨水泵站主泵房和格栅井沉井施工中应用冻结法,对冻结法施工在沉井施工中的可行性、冻结方案设计、冻结过程控制进行了充分论证,并经过了实践检验,得出如下结论:冻结法在沉井施工中应用是可行的,对解决特殊施工环境下的难题十分有效;冻结法方案制定要充分考虑地质条件和沉井参数;冻结法具有的安全、环保、封水效果好、适应性强等特点,在市政沉井施工、基坑支护等领域市场广阔。
Application of freezing method in the formation of freezing curtain around the caisson, looking for in the lower strata to prevent infiltration of groundwater impermeable layer, both together to form a closed cylinder, to ensure that the construction area within the caisson underground water and the outside world completely isolated to four weeks Loose layer does not collapse the purpose. Through the application of freezing method in the construction of a pumping station main pumping station and grille well sunk well, the feasibility of the freezing method construction in caisson construction, the design of the freezing scheme and the control of the freezing process are fully demonstrated and practiced Test and concluded as follows: The application of freezing method in sunk well construction is feasible and it is very effective in solving the problems under special construction environment; the scheme of freezing method should fully consider the geological conditions and parameters of caisson; the method of freezing has the advantages of safety, Environmental protection, water sealing effect is good, strong adaptability and other characteristics, in the municipal sunken construction, foundation pit support and other fields of broad market.