Foundation pit dewatering method used under complex geological conditions

Abstract

The invention discloses a foundation pit dewatering method used under complex geological conditions, which belongs to the technical field of civil construction, and comprises the following steps: before excavation of a foundation pit, arranging a plurality of tube well dewatering systems around the foundation pit for tube well dewatering; when the foundation pit is excavated to be above the elevation of a foundation slab, a closed-loop light well point dewatering system is arranged along the periphery of a foundation trench for light well point dewatering; after earthwork is excavated to a cushion layer, an open water area appears in the middle of a foundation trench, and an open water drainage system is adopted for open water drainage. According to the method, comprehensive consideration is carried out on complex geological conditions, foundation pit dewatering is completed through combined use of the tube well dewatering method, the improved and innovated light well point dewatering method and the improved and innovated exposed drainage dewatering method, and it can be guaranteed that the construction progress and quality are not affected by interference of underground water in the construction process under the complex geological conditions.

Description

technical field [0001] The invention relates to the technical field of civil construction, in particular to a method for dewatering foundation pits under complex geological conditions. Background technique [0002] In the current foundation construction, due to factors such as complex engineering and geological conditions or unknown geological conditions, after the excavation of the foundation pit is completed, groundwater or surface water flows into the foundation pit, etc., especially in rivers, rivers, lakes, etc. When constructing in places with a lot of water, such as the seaside, the complex geological conditions will easily form water pockets or multiple areas with different water seepage. If the water level at the bottom of the foundation pit is too high, it will make it impossible to carry out waterproofing and steel bar binding in subsequent construction. According to normal conditions, the accumulated water in the foundation pit is cleared by means of water collec...

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Problems solved by technology

[0002]In the current foundation construction, due to factors such as complicated geological conditions or unknown geological conditions, after the excavation of the foundation pit is completed, there is groundwater or surface water at the bottom of the foundation pit When water flows into the foundation pit, etc., especially when constructing in places with a lot of water such as rivers, rivers, lakes, and seasides, complex geological conditions are likely to form water pockets or multiple areas with different water seepage. Excessive water level at the bottom of the foundation pit will cause Waterproofing and steel bar binding cannot be carried out in subsequent construction

According to normal conditions, the accumulated water in the foundation pit is cleared by means of water collection and drainage, and the combination of retaining walls, drainage ditches and water pumps is helpful for the discharge of water in the foundation pit. Often a single precipitation method is difficult to ensure that under complex geological conditions During the construction process, the construction progress and quality will not be affected by the interference of groundwater

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