Method for quickly treating soft construction surface of pile foundation in sandy soil area

Abstract

The invention discloses a method for quickly treating a soft construction surface of a pile foundation in a sandy soil area. The working surface is in a foundation pit excavated in the sandy soil area. The method comprises the following steps that drainage ditches and guardrails are arranged on the periphery of the exterior of the foundation pit, a plurality of light well point dewatering wells used for blocking or reducing supply of underground water on the outer side of a site are drilled in the exterior of the foundation pit, and a plurality of light well point dewatering wells which are arranged in a longitudinal and transverse mode are drilled in the interior of the foundation pit; the multiple dewatering well pipes are lowered into the light well point dewatering wells outside the foundation pit and the light well point dewatering wells inside the foundation pit correspondingly, and the tops of the dewatering well pipes communicate with and are connected into a vacuum pump; and a simple observation well is arranged in the middle of a dewatering area, and after the water level is lowered to 1 meter, the foundation pit is rolled by an excavator until the ground surface of the foundation pit is free of water seepage and a soil layer is compacted. According to the method, the adverse effects of the underground high water level and the high stratum permeability of the construction site on the construction surface can be quickly solved at low cost, safe and smooth construction is guaranteed, and the positive effects on improving the construction efficiency and improving the engineering benefits are achieved.

Description

Technical field [0001] The present invention relates to the field of engineering construction technology, in particular, to rapidly treated the weak construction surface method of pile foundation in the sand region. Background technique [0002] In the construction experience of the pile foundation project, it is often encountered in the case where the groundwater level of the site is high, and the site formation is strong in water permeability (such as sand-containing land layer having a higher sand) or a water content higher formation. The groundwater level is high in the formation, and the groundwater is maintained. It often occurs due to the construction machinery and equipment movement, vibration, and heavy pressure, the groundwater exfoliates out the surface, so that the work surface is more weak and weak, pile foundation surface It becomes very strong, the surface is very low, the construction machine is difficult to move, and the machine equipment cannot be constructed in...

AI Technical Summary

Problems solved by technology

Construction in areas with high underground water level and strong water permeability of the strata often causes ground subsidence due to movement, vibration and heavy pressure of construction machinery and equipment, and a large amount of groundwater seeps out of the surface, making the working surface weaker and muddy, and the pile foundation construction surface It becomes very poor in support, the surface hardness is very low, it is extremely difficult to move the construction machinery, and the machinery and equipment are deep in the soil and cannot be constructed, especially the turning point of the machinery is extremely difficult to move, and even cause inclination due to different subsidence degrees of the pile driver equipment , has a greater safety risk, and in extreme cases, overturning will cause a safety accident

At present, directly laying steel plates or hardening the working face is costly and the effect is not good, because the lower soil layer is soft and has a high moisture content, and the lower soil layer will rise after repeated walking and heavy pressure.

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