Novel totally-closed water stopping system for water-rich stratum foundation pit and construction method of novel totally-closed water stopping system

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a novel totally-closed water stopping system for a water-rich stratum foundation pit and a construction method of the novel totally-closed water stopping system. According to a totally-closed water stopping technique, a suspended water-stopping curtain is adopted as the lateral wall of the foundation pit; a horizontally sealed artificial water-resisting layer is adopted as the bottom of the foundation pit; the totally-closed water stopping system is formed by the suspended water-stopping curtain on the lateral wall and the horizontally sealed artificial water-resisting layer; no hydraulic connection is formed between the underground water within the range of the foundation pit and the underground water out of the pit; and the underground water in the foundation pit becomes static water. A totally-closed foundation pit with an excellent structure is provided by reasonably setting various construction parameters and various structure parameters; the construction method is simple; shortage of underground water resources due to the fact that the underground water resources are destroyed by a large amount of rainfall inside and outside the foundation pit when no a water-resisting layer foundation pit is constructed at the bottom of the foundation pit in a water-rich area at present is solved; the underwater resources are protected; and the novel totally-closed water stopping system has relatively important significance in 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 novel fully-enclosed water-stop system and a construction method for a foundation pit in a water-rich stratum. Background technique [0002] For deep foundation pit precipitation in traditional water-rich areas, 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 foundation pit The groundwater within the range has no hydraulic connection with the groundwater outside the pit, and becomes static water. It is only necessary to pump groundwater above a certain depth below the bottom of the pit according to needs, and then carry out dewatering in the pit, ensuring the safety of the foundation pit project. However, in Jinan spring area, karst fiss...

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Problems solved by technology

However, in Jinan spring area, karst fissure water is widely distributed, and the basement karst channels are complex and sometimes the water-resisting layer is thin, and the basement water-repelling effect is poor, and the traditional water-stop curtain cannot play its due role. In this case, the foundation pit Construction usually adopts the method of hanging water-stop curtain + simultaneous precipitation inside and outside the pit, and the formed water conservancy slope meets the requirement that the groundwater level is lower than the bottom of the pit. However, this construction method needs to continuously extract groundwater during the construction process. Resources have caused a huge waste, which has brought huge hidden dangers to the protection of spring water in Jinan area. Therefore, the above two commonly used foundation pit precipitation methods have disadvantages in Jinan area

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