A ground dewatering and drainage method for well point pumping to control group pipe siphon

Abstract

The invention discloses a foundation dewatering and drainage method for pumping water at well points to control group pipe siphons. Firstly, a siphon drainage pipe is inserted into the foundation soil where the groundwater level is to be lowered. The groundwater can seep down to the entrance of the siphon drainage pipe along the outer wall of the siphon drainage pipe. The other end of the drainage pipe is put into the pumping well, and the groundwater level in the pumping well is lowered by the drainage pump with a water level control system, so that the groundwater in the foundation soil enters through the siphon pipe. The water in the pumping well is pumped and drained to the surface by the drainage pump to realize the groundwater level drop of the foundation soil; the invention uses the siphon drainage pipe to concentrate the groundwater in various parts of the foundation soil into the pumping well; the siphon drainage only needs to be controlled The groundwater level difference and different flows can maintain the siphon process, which can effectively solve the drainage problem of low-permeability soft soil foundation; the energy-saving effect is remarkable, the project cost is low, and the project implementation process is easy to operate.

Description

technical field [0001] The invention relates to a drainage technology for lowering the groundwater level of foundation soil, in particular to a foundation drainage method suitable for soft soil foundation precipitation consolidation and foundation pit drainage engineering. Background technique [0002] Soft soil foundations have high natural water content, low strength, high compressibility, poor water permeability, and low foundation bearing capacity. Reinforcement treatment is required before engineering construction can be carried out. Accelerating the consolidation of soft soil through drainage measures is the key to improving the strength of soft soil foundations. important technical measures. When excavating a foundation pit in a soil layer with a high groundwater level, it is often necessary to ensure dry construction in the pit, so it is necessary to reduce the water level in the foundation pit, resulting in a water level difference inside and outside the pit, which ...

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Problems solved by technology

At present, drainage consolidation methods are commonly used to strengthen soft soil foundations: loading preloading method, setting sand wells or drainage belts on soft foundations and laying sand cushions, and applying surcharge preloading on the cushions. The disadvantages are: The drainage speed of soft soil is slow and there is lateral displacement extrusion. It is necessary to control the loading rate, and it takes a long time to complete the consolidation. After reaching the required consolidation degree, it needs to be unloaded. The process is complicated, the time is long, and the cost is high; Vacuum combined loading and preloading method is an effective soft foundation reinforcement method, but the process is complicated, the processing time is long, and the cost is high

The current methods of artificially lowering the groundwater level in foundation pits can be divided into open ditch drainage and well point precipitation, and their efficiency is often low

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