Vacuum low-level normal pressure device for soft soil foundation reinforcement treatment

Abstract

The invention discloses a vacuum low-level normal pressure device for soft soil foundation reinforcement treatment. The device comprises a drainage well and a tube arranged in the drainage well, wherein the bottom of the drainage well is coated with a filter membrane, and extends into a soft soil foundation base course; the drainage well is connected to a vacuum pump and a booster pump respectively, and provided with a changeover valve so as to communicate with the vacuum pump or the booster pump selectively, and the tube is provided with a check valve; when the water level of a soft soil foundation is relatively high, the booster pump is communicated with the drainage well through controlling the changeover valve; the drainage well is pressurized internally to discharge underground water outside through the tube, so that the water resistance in the drainage well is reduced greatly; the well resistance of the filter section of the drainage well can be overcome while pressurizing for drainage; the well resistance effect can be reduced effectively so that the drainage well drains water smoothly.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation reinforcement engineering, in particular to a vacuum low-level preloading device for soft soil foundation reinforcement treatment. Background technique [0002] For soft soil foundation, when adopting methods such as vacuum preloading or surcharge preloading for treatment and reinforcement, generally vertical sand wells or plastic drainage boards are drilled in the soft soil foundation as drainage channels, and the self-weight load of the piled material or vacuum Drainage consolidation occurs under load preloading, pore water pressure slowly dissipates, effective stress increases slowly, foundation strength gradually increases, and most of the foundation consolidation settlement is eliminated during the construction period, thereby improving the bearing capacity of the soft soil foundation. get improved. [0003] However, the above method has the following defects when performing sof...

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Problems solved by technology

[0003] However, the above method has the following defects when performing soft foundation reinforcement treatment: on the one hand, soil particles will form a dense layer on the vertical sand well wall under long-term infiltration, causing vertical drainage "well resistance" phenomenon; On the one hand, the vacuum degree on the surface is transmitted downward due to water resistance, and the vacuum degree cannot be transmitted to the bottom of the foundation quickly and without attenuation, thus affecting the reinforcement effect and effect on the soft soil foundation

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