Light well point drainage construction technology

Abstract

The invention discloses a light well point drainage construction technology. In the technology, a hole is drilled on a slurry protective wall by a conventional geological drilling rig, a filter pipe is arranged in the wall to form a tube well; high pressure water is adopted to inject and flush the inside of the filter pipe to destroy the slurry structure layer of the protective wall and ensure a filter layer is automatically formed on the periphery of the filter pipe; a water outlet pipe the front end of which is provided with a submersible pump is arranged in the filter pipe; and finally, the submersible pump is started to realize well point drainage, wherein the diameter of the tube well is less than or equal to 200mm, the distance among the tube wells is between 3 and 10m; and a returnwater pipe is arranged on the water outlet pipe. The light well point drainage construction technology provided by the invention is improved on the basis of the traditional light well point drainage;by adjusting the drilling machinery, the diameter and distance of the tube wells and combining the tube well forming technology with the flow rate adjustment controlled water pumping technology, great drainage effect can be obtained, the movement is convenient, the construction speed is fast, the influence range is small, energy sources are saved, and the assembly and disassembly are convenient; and light well point drainage construction technology provided by the invention is suitable for foundation pit excavation of medium and small depth natural sloping in weak to strong water permeable soil layers.

Description

technical field [0001] The invention relates to a light well point dewatering technology for foundation pits, in particular to an improved light well point dewatering construction method. Background technique [0002] my country's coastal tourism industry has developed rapidly in recent years, and the construction of municipal and water conservancy infrastructure in coastal areas is increasing. Often these projects are located in the silt, medium sand, and gravel sand layers deposited by the Quaternary marine-terrestrial interfacial deposits, which have strong water-rich properties. Water permeability, poor engineering properties. The excavation of the foundation pit involves the drainage of the foundation pit. [0003] The traditional light well point dewatering construction method is a common method in foundation pit excavation dewatering and drainage measures, because most of the excavation depth is within 8 meters. If the dewatering is successful, the foundation pit exca...

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Problems solved by technology

[0004] (1) Due to the use of large apertures, the pore-forming and well-forming equipment is bulky, occupies a large area, is inconvenient to move, the structure of the well wall is complex, the cost is high, and the construction is slow;

[0005] (2) Due to the complex structure of the well wall, the surroundings are easily blocked by mud skins, and the supply water in the sand layer is extremely unstable, so the water pump is difficult to work stably and is easily damaged;

[0006] (3) The funnel effect of single well precipitation is not obvious, and the groundwater level between wells does not drop obviously or basically does not drop, and the expected effect cannot be achieved;

[0007] (4) The traditional light well point dewatering construction has poor adaptability, and the same type of water pump cannot adapt to the formation of different water permeability and the change of the water output of the tube well during the pumping process;

[0008] (5) There are still two obvious deficiencies in the traditional light-weight well point dewatering construction method: due to the large-diameter, large-flow, and large-spacing dewatering and drainage method, the influence of precipitation is large, and there may be damage to ground buildings and groundwater environments. sexual influence;

[0009] (6) The traditional light well point dewatering construction method is expensive and slow to complete wells;

[0012] First, the groundwater level changes back and forth, which cannot be stably controlled at the lowest depth level, which affects the precipitation effect of the foundation pit;

[0013] The second is that the environment in the tube well can easily cause the sensor to fail, and the water pump will not pump water when the water level is high, and the water pump will run dry when the water level is low;

[0014] The third is that the water pump is frequently stopped and started, which will make the water pump prone to failure and damage;

[0015] Fourth, generally speaking, there are more water pumps for well point dewatering, and more automatic controllers and supporting materials are required, which increases the cost of well point dewatering;

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