Construction method novel vertical shaft horizontal rotation jet grouting pile foundation pit lateral wall water stopping curtain

Abstract

The invention belongs to the technical field of construction engineering and particularly relates to a construction method of a novel vertical shaft horizontal rotation jet grouting pile foundation pit lateral wall water stopping curtain. The method includes: a vertical shaft is disposed on the periphery of a foundation pit, and a horizontal rotation jet grouting pile water stopping structure is constructed in the vertical shaft to serve as the foundation pit lateral wall water stopping curtain. The method has the advantages that the horizontal rotation jet grouting pipe can be only constructed to a position above the underground water level, part of useless water stopping curtain is omitted, diseconomy caused by the vertical water stopping curtain used by some foundation pit projects is avoided, and resources such as manpower and material resources are saved; meanwhile, the horizontal rotation jet grouting pile water stopping curtain and a pit bottom water-resisting layer form a sealed water resisting system, precipitation out of the pit is avoided, water resource waste is reduced, and the method is significant to spring water protection of the spring city.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method for a water-stop curtain on the side wall of a vertical shaft horizontal jet grouting pile foundation pit. Background technique [0002] For traditional deep foundation pit dewatering, vertical water-stop curtains are generally installed on the side walls of the foundation pit, and the water-stop structure is combined with the support structure. The water-stop curtain and the base water-resisting layer form a closed water-proof system. At this time, the scope of the foundation pit The groundwater inside the pit has no hydraulic connection with the groundwater outside the pit, and becomes static water. As long as the groundwater above a certain depth below the bottom of the pit is extracted as required, the water in the pit can be dewatered to ensure the safety of the foundation pit project. However, in the actual foundation pit c...

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Problems solved by technology

However, in the actual foundation pit construction process, sometimes the proven groundwater level is low but still higher than the foundation pit bottom elevation. In this case, it is not so economical to set up vertical water-stop curtains. The method of setting up dewatering wells in the pit and outside the pit for centralized dewatering is used to meet the requirement that the groundwater level is lower than the bottom of the foundation pit. This construction method requires continuous pumping of groundwater during the construction process, and the pumping of a large amount of groundwater has caused a huge waste of water resources. , especially in the spring area where the underground water system is developed, the damage to the spring water is huge

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