A Layered Bidirectional Hydrophobicity Method for Foundation Pit Dewatering
A foundation pit and drainage technology, applied in infrastructure engineering, construction, etc., can solve the problems of slow dewatering and dewatering rate of drainage wells, difficult to achieve deep soil dewatering, slowing down dewatering rate in permeable sections, etc., and achieves strong practicability. and reliability, improve local clogging, and increase the effect of water output
Active Publication Date: 2022-08-02
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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Problems solved by technology
[0003] Actual engineering shows that there are the following disadvantages in the construction of drainage wells in soft soil layers: (1) The low permeability of soft soil leads to slow dewatering and dewatering rate of drainage wells, which affects the construction period; (2) is limited by the soil itself With the passage of precipitation time, the blockage of the permeable section will further slow down the precipitation rate in the well; (3) Most of the thicker soil layers need to be excavated in layers, and the existing technology is in the upper part The excavation of the soil layer often leads to vacuum failure of the dewatering well, making it difficult to further dewater the deep soil
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[0026] Example: The layered two-way hydrophobicity method for foundation pit dewatering in the embodiment of the present invention is mainly realized by the combination of the drainage well 1 and the gas injection well 2, wherein the drainage well 1 and the gas injection well 2 are formed in the same way, That is, the well structures of both are the same. like figure 1 As shown, both the drainage well and the gas injection well 2 include a well pipe section 3 , a sealing section 4 , a filter section 5 and a sedimentation pipe section 6 .
[0027] Among them, the well pipe section 3 is made of metal pipes, which are connected with other parts of the well structure by welding or reliable mechanical connection, and mainly play the role of connecting pieces.
[0028] like image 3 As shown, the sealing section 4 includes a non-porous well pipe section 4.1, a grouting pipe 4.2, a geotextile bag 4.3 and a grouting body 4.4. Among them, the geotextile bag 4.3 as the inclusion is f...
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The invention relates to the technical field of foundation pit dewatering, in particular to a layered bidirectional drainage method and a device thereof for foundation pit dewatering, characterized in that well structures are arranged at intervals in the foundation pit site, and the well structures also serve as drainage wells and a gas injection well; the drainage well is used for extracting and draining the foundation pit site, and the gas injection well is used for injecting high-pressure gas into the foundation pit site. The advantages of the present invention are: effectively improve the efficiency of draining and dewatering; avoid the construction difficulty caused by the difference in well-forming methods, the drainage well and the gas injection well are arranged at intervals to facilitate the exchange of the drainage well and the gas injection well during the drainage process; The drying effect of thick soil; greatly improve the local blockage caused by long-term directional flow in the well, enhance the connectivity between soil voids, expand the drainage channel, and increase the water output in the drainage well.
Description
technical field [0001] The invention relates to the technical field of foundation pit dewatering, in particular to a layered bidirectional hydrophobicity method and a device thereof for foundation pit dewatering. Background technique [0002] With the continuous advancement of urbanization, many complex underground structures are increasing. The excavation of foundation pit is the primary procedure for the construction of large underground structures. Due to the characteristics of high water content and compressibility in soft soil areas, necessary precipitation measures should be taken during the excavation of foundation pits to dry the soil in the area, enhance the strength of the soil, and ensure the excavation of foundation pits. stability. Usually, for unconfined aquifers, engineers use the method of arranging drainage wells in the pit to reduce the soil moisture content. [0003] Actual engineering shows that there are the following disadvantages in the construction...
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IPC IPC(8): E02D19/06E02D19/10
CPCE02D19/06E02D19/10
Inventor 顾国荣杨石飞路家峰蔡永生罗志华张晗
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST