Active anti-floating design method based on anti-floating variable water level

Abstract

The invention provides an active anti-floating design method based on an anti-floating variable water level. The method comprises the following steps: calculating the total precipitation amount Q of the anti-floating variable water level according to the soil permeability, the anti-floating highest variable water level, the anti-floating constant water level, the width of a foundation pit fat groove at the anti-floating constant water level, the embedding length of a single pipe and a seepage flow path; uniformly burying pipes at the bottom of the foundation pit fat groove, and calculating the anti-floating variable water level precipitation component qd borne by a single pipe according to a uniform spreading method; assuming that the flow flowing to the drainage pipe can penetrate through the pipe wall and is discharged by the drainage pipe, calculating the water inflow qj of the single pipe according to an averaging method; calculating the number n of buried pipes according to a drainage pipe water inlet capacity checking calculation formula; and calculating the pipe laying spacing s according to the bottom width of the foundation pit fat groove. According to the method, building structure damage caused by imperfect water prevention and drainage of the peripheral earth surface in the construction period and the 'basin effect' when the self weight of the building is still small is avoided, and building structure damage caused by lack of effective water prevention and drainage measures or insufficient anti-floating safety reserve to resist the 'basin effect' water buoyancy in the operation and maintenance period is also avoided.

Description

technical field [0001] The invention relates to an active anti-floating design method based on the anti-floating variable water level, and belongs to the technical field of building anti-floating technology. Background technique [0002] With the development and utilization of urban underground space, the original hydrogeological environment of the site is destroyed, and the original runoff conditions of the site are changed and blocked, resulting in poor runoff of surface water such as atmospheric rainfall and groundwater, which infiltrates and collects into the foundation pit, causing groundwater The sudden rise in water level forms a "pool-basin effect". The water level of the "pool-basin effect" belongs to the abnormally unstable water level of the construction site, which is accidental and destructive. It is often ignored in the anti-floating design and construction of buildings, causing huge economic losses and even lead to building safety hazards. On the one hand, it...

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Problems solved by technology

[0002] With the development and utilization of urban underground space, the original hydrogeological environment of the site is destroyed, and the original runoff conditions of the site are changed and blocked, resulting in poor runoff of surface water such as atmospheric rainfall and groundwater, which infiltrates and collects into the foundation pit, causing groundwater The sudden rise in water level forms a "pool-basin effect". The water level of the "pool-basin effect" belongs to the abnormally unstable water level of the construction site, which is accidental and destructive. It is often ignored in the anti-floating design and construction of buildings, causing huge economic losses and even posed a safety hazard to the building

On the one hand, it shows that the surrounding surface waterproof and drainage system has not been perfected during the construction period, and the anti-floating structure has not yet been completed. Damage to the building structure during construction, on the other hand, if the impact of the "pool-basin effect" has not been considered in the anti-floating design or the anti-floating safety reserve capacity is not enough to resist the water buoyancy of the "pool-basin effect", it will cause damage to the building structure during the operation period. Moreover, if the anti-floating design is carried out according to the water level of the "pool effect" in the anti-floating design, the construction cost will increase significantly.

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