A method for constructing shaft-type underground parking garage by freezing method

Abstract

The invention discloses a freeze construction method for wellbore type underground parking garage. A circular wellbore is built underground by sequentially using freeze construction, excavation construction, grouting and thaw grouting, and an elevator type and intelligent tower type stereo garage system currently applied at home and abroad is installed in the wellbore for operation. Before construction of the wellbore, an artificial freezing method is applied, water-bearing strata around the wellbore is frozen, a frozen wall having temporary load bearing and water isolating functions and meeting construction safety requirements is formed, and wellbore excavation is performed under protection of the frozen wall; the frozen wall is formed by mutual matching mutual complementing of inner ringfreezing holes and outer ring freezing holes; a cap beam is firstly constructed at the top of the wellbore; excavation construction of the outer wall of the wellbore, concrete pouring on the bottom plate of the wellbore and construction of the inner wall of the wellbore are performed in sequence; after freezing of the wellbore, lining is performed, and grouting and strata thaw are performed for grouting compensation.

Description

technical field [0001] The invention relates to the technical field of shaft-type underground parking garage construction, in particular to a method for constructing a shaft-type underground parking garage by freezing method. Background technique [0002] At present, there is one shaft-type underground garage that has been built and operated in China, and 3 to 4 shaft-type underground garages are under construction. The cities that plan to build shaft-type underground garages include Harbin, Beijing, Tianjin, Guangzhou and other cities. The shaft-type underground garages that have been built or are under construction are constructed using the caisson method or the underground diaphragm wall method. There is no precedent for the construction of the freezing method, and the construction of the freezing method has a certain application and promotion value. [0003] The artificial ground freezing method is not only suitable for loose and unstable alluvium and water-bearing rock ...

AI Technical Summary

Problems solved by technology

2) There must be a stable rock formation at the bottom of the caisson, otherwise the blade foot cannot be sealed

4) During the caisson construction process, the wellbore will be greatly inclined due to various reasons, and the uneven stress on the well wall will easily cause cracks. If it is used for lifting, it will affect the use

2) If the construction method is improper or the construction geological conditions are special, it may cause water leakage because the adjacent wall sections cannot be closed

3) If the underground diaphragm wall is used as a temporary retaining structure, it will cost more than other methods

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