Tube well used for unwatering and pressure-reducing drainage and drainage method of tube well

Abstract

The invention discloses a tube well used for unwatering and pressure-reducing drainage. The tube well comprises a well pipe comprising a precipitation tube, a pressure-reducing water filtering tube, a pressure-reducing well wall tube, an unwatering water filtering tube and an unwatering well wall tube which are sequentially arranged from bottom to top in a penetrating mode, and the joint of the pressure-reducing well wall tube and the unwatering water filtering tube forms a lower pressure-reducing well pipe and an upper unwatering well pipe through a seal board in a partitioning mode. The seal board is provided with a natural flow pipe comprising a water inlet pipe section and a water outlet pipe section, the water inlet pipe section is provided with a water inlet, the water outlet pipe section is sequentially provided with a plurality of water outlet pipe section bodies in the axial direction, each water outlet pipe section body is provided with a side wall water outlet and an upper water outlet, and the side wall water outlets and the upper water outlets are of opening and closing structures. The tube well simplifies drainage procedures, increases the drainage success probability, reduces engineering costs, accelerates the construction progress, increases the deep foundation pit excavation safety coefficient, and simplifies capping work. The invention further discloses a drainage method using the tube well.

Description

technical field [0001] The invention relates to a tube well for simultaneous dewatering and decompression dewatering, and in particular to a dewatering method for the tube well for simultaneous dewatering and decompression dewatering. Background technique [0002] At present, with the acceleration of urbanization and the rapid development of rail transit construction, large-scale deep foundation pit projects are increasing. Due to the existence of groundwater (diving, confined water), the excavation of foundation pits and underground constructions Construction often has adverse effects or constitutes a safety threat. It is necessary to use dewatering and dewatering (to make the working surface relatively dry) and decompression and dewatering (to eliminate the threat caused by the pressure of the pressurized water to the stability of the bottom of the foundation pit) to facilitate the operation in the pit. Especially to ensure the safety of the underground construction proces...

AI Technical Summary

Problems solved by technology

In the dewatering and dewatering stage, the water-retaining plug realizes the function of water isolation to facilitate dewatering and dewatering, enters the decompression and dewatering stage, eliminates the water-isolation function of the water-retaining plug, and implements decompression and dewatering of the confined aquifer. The above utility model has the ability Reduce engineering costs, save resources, speed up construction progress, facilitate pit operations, and facilitate construction safety. However, due to the use of a water barrier device in the tube well, the water barrier device can be used to separate dewatering and decompression precipitation. However, since the sealing performance of the water stopper device is difficult to be guaranteed, it is necessary to conduct a watertight test on the water stopper device before draining and dewatering the upper submerged layer to verify that the water stopper device has completely blocked the upper and lower air-water communication After that, the dewatering and precipitation of the submerged layer can be started until the dewatering operation of the dewatering stage ends, thus increasing the complexity and difficulty of construction, and it is difficult to ensure that the dewatering and precipitation can be carried out smoothly. At the same time, in the above utility model The tube well needs to be used in conjunction with a vacuum pump, which increases the construction cost. In addition, it is easy to see "unsealable" water seepage during the subsequent well closure, and it is difficult to realize the possibility of sealing the well in a dry environment

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