Foundation pit supporting and protecting system for high groundwater level and high bed rock exposed face and construction method thereof

Abstract

The invention discloses a foundation pit supporting and protecting system for a high groundwater level and a high bed rock exposed face and a construction method of the system. The supporting and protecting system comprises slope protection piles in an inner row and water stop curtains in an outer row. The water stop curtains are combined water stop curtains, comprise a row of high-pressure waterstop piles for sealing the gaps between the slope protection piles and further comprise outer row sleeve valve grouting bodies for sealing the gaps between the slope protection piles and inner row sleeve valve grouting bodies for enhancing sealing. The construction method ensures that the construction sequence of high-pressure rotary spray piles or high-pressure swing spray piles is always in advance of construction of inner side sleeve valve pipe grouting bodies and outer side sleeve valve pipe grouting bodies. The advantages of high-pressure water stop piles and sleeve valve pipe grouting are combined, and the multiple combined curtain system achieves the good water stop effect. The foundation pit supporting and protecting system particularly has the obvious advantages in geological conditions such as the high groundwater level and the high bed rock exposed face, meanwhile can enhance foundation pit periphery soil and is economical and efficient.

Description

technical field [0001] The invention relates to a foundation pit support system, in particular to a foundation pit support system and a construction method for high groundwater level and high bedrock outcropping surface. Background technique [0002] With the acceleration of my country's urbanization process, a large number of high-rise and super high-rise buildings in cities have emerged, and foundation pit projects are constantly developing in the direction of super large and super deep. Deep foundation pits of 20m or even more than 30m are not uncommon. In order to ensure the smooth implementation of foundation pit engineering, groundwater must be treated. At present, engineering accidents that cause foundation pits to collapse due to improper groundwater treatment or precipitation to cause foundation pit roads and building settlements to collapse occur from time to time. Therefore, more and more regions expressly stipulate that the water-stop curtain must be installed f...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a foundation pit support system with high groundwater level and high bedrock exposed surface and its construction method, to solve the problem that the existing support system cannot meet the foundation pit with high groundwater level and high bedrock exposed surface, and there is a construction risk High degree of tension, great possibility of development of tensional cracks, serious technical problems of leakage during earthwork excavation, especially the technical problems of water stop and deformation control of the foundation pit are more difficult when there are subways and buildings around the foundation pit, and To solve the problem of poor flexibility in choosing support systems for different working conditions and deformation requirements

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