Foundation ditch dewatering and drainage excavation structure and application method

Abstract

The invention discloses a foundation ditch dewatering and drainage excavation structure and an application method. The application method comprises the following steps of: (1) surveying and setting out the range of a foundation ditch to be excavated; (2) excavating the foundation ditch in a sloping supporting manner till reaching an elevation above an underground water level, and carrying out mutual overlap joint of cement-soil mixing piles along the periphery of the foundation ditch to form a waterproof curtain which stretches into a water-tight layer below a foundation base elevation; (3) continuously excavating the foundation ditch by regions in a sloping manner till reaching the foundation base elevation, carrying out dewatering and drainage during excavation, and spraying a concrete surface layer onto a slope surface below the underground water level after ending excavation. The application method has the beneficial effects that underground water outside the ditch is isolated from a working plane in the ditch in a construction process; well-point dewatering is not needed during construction; meanwhile, the simultaneous operation of earthwork construction and dewatering and drainage is ensured, thereby greatly improving the construction efficiency and ensuring the construction quality.

Description

Technical field [0001] The invention relates to the field of foundation pit engineering, and is actually a foundation pit drainage excavation structure and application method. Background technique [0002] With the rapid development of the construction industry and the emergence of high-rise buildings, most of the foundations are set below the groundwater level. If the groundwater problem is not solved well, a large amount of groundwater will flow into the foundation pit and cause great troubles for the construction. Causes the occurrence of foundation pit cracking, collapse and piping. In order to ensure the smooth progress of the project, well-point precipitation is usually used to lower the water level below the designed base elevation before construction. But this method has the following disadvantages: [0003] 1. If the stratum permeability is good, the groundwater level is deep, and the well is pumped smoothly and the water volume is relatively uniform, it is convenient fo...

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Problems solved by technology

[0004] 2. The efficiency of water drainage is low, and the general construction period of high-rise buildings is long, ranging from two to three years to several years, which will lead to an increase in the continuous cycle of water drainage work and unnecessary waste of resources;

[0005] 3. Long-term pumping of groundwater will take away the surrounding sediment, which will increase the foundation gap of the building and reduce the bearing capacity of the foundation, resulting in the settlement of the surrounding buildings and deformation and cracking of the ground surface, causing serious consequences;

[0006] 4. Long-term extraction of groundwater results in uneven distribution of water levels, causing groundwater outside buildings to be pumped out, resulting in waste of resources

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