Vacuum dewatering process for deep foundation pit

Abstract

The invention discloses a vacuum dewatering process for a deep foundation pit. The vacuum dewatering process comprises preparation work before dewatering, dewatering well equipment and mounting procedures and dewatering and foundation pit excavation. The vacuum dewatering process is suitable for foundation pit dewatering of various soil layers such as floury soil, clay, muddy clay and silt, the whole deep foundation pit dewatering process including vacuumizing, water pumping and outward water drainage in a well pipe can be completed through a jet vacuum pump or a mechanical vacuum pump, a vacuum main water pipe and a vacuum water pumping pipe, the vacuum degree is controlled to be about -0.06 Mpa, and the effective depth of water pumping can be larger than 10 meters. A traditional mode that a submersible pump, a pipeline and auxiliary facilities are arranged in a dewatering well is thoroughly changed, full-automatic vacuum deep well dewatering is achieved through the vacuum pump, and the purposes of shortening the dewatering period, improving the dewatering quality, saving the dewatering cost and improving the overall environment of a construction site are achieved.

Description

technical field [0001] The invention relates to the technical field of large-scale building foundation construction, in particular to a technology for vacuum dewatering of deep foundation pits. Background technique [0002] With the rapid development of urban construction, the number of large-scale buildings is increasing rapidly. During the construction of large-scale buildings, from the excavation of deep foundation pits to the completion of deep foundation pits, the underground dewatering process through dewatering wells has been accompanied In general, lowering the groundwater level in the foundation pit is also called groundwater control, that is, in the construction of the foundation pit, the groundwater level is lowered to meet the requirements of the enclosure structure and excavation construction of the foundation pit. The higher the groundwater level in the construction environment, the lower the precipitation required by the foundation. The deeper the depth, the m...

AI Technical Summary

Problems solved by technology

In order to prevent deep foundation pits from causing harm to surrounding buildings and facilities, the method of lowering the groundwater level at deep well points is generally used to solve such technical problems. The problems solved by vacuum deep well point dewatering are, first, to increase The total depth of precipitation reduces the water content of the soil in the foundation; the second is to simplify the structure of the dewatering well points and the dewatering equipment itself; the third is to arrange the dewatering equipment reasonably in the foundation pit to improve the overall dewatering efficiency in the foundation pit, the existing technology patent No.: ZL200610024254.2 "Vacuum foundation pit deep well dewatering equipment", ZL200620039852.2 "Intubation vacuum foundation pit deep well dewatering equipment" and ZL200520047130.7 "Foundation pit deep well point dewatering special equipment" discloses deep well well point dewatering equipment , although this technical solution has achieved certain effects in actual construction, there are still some defects. One is that the second vent hole 35 needs to be set multiple times on the wall of the vacuum pumping pipe, which leads to complicated process and affects the precipitation efficiency.

The second is that the well pipe at the deep well point cannot be put in place at one time, and needs to be set several times. In addition, the well pipe cannot be lowered with the excavation of the foundation pit, which hinders the normal operation of the construction machinery

The third is that the pumping stations in the large foundation pit are scattered, and there are defects such as complicated installation of water and electricity pipelines, scattered drainage, difficult management, large consumption of manpower and equipment resources, and the overall environment of the construction site is dirty and disorderly.

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