Flat belt lateral swelling combined vacuum pre-pressing foundation processing device and method

Abstract

The invention discloses a flat belt lateral swelling combined vacuum pre-pressing foundation processing device. A sand cushion layer is arranged above a construction region. A sealing film is arranged on the upper surface of the sand cushion layer. A plastic water drainage plate and a plastic flat belt are arranged in the construction region in a driving mode. A filtering pipe is embedded in the sand cushion layer. The plastic water drainage plate and the filtering pipe are connected. The filtering pipe is connected with a film outlet device. The film outlet device is connected with a jet pump through a first connecting pipe. An air injection pipe is embedded in the sand cushion layer. The plastic flat belt is connected with the air injection pipe which is connected with the film outlet device. The film outlet device is connected with an air compressor through a second connecting pipe. Film pressing ditches are formed around the construction region. A clay sealing wall is arranged below the film pressing ditches, the four edges of the sealing film are laid in the film pressing ditches and pressed compact with clay. Construction starts, the jet pump and the air compressor are started, vacuumizing is performed on the construction region, the plastic flat belt is filled with gas so that the plastic flat belt can laterally swell and have a squeezing effect on the peripheral edges. The technical scheme is applied to reinforcing of a soft soil foundation, the flat belt laterally swells and can generate fractures and accelerate soil solidification, additional loads in the horizontal direction are applied, the bearing force of the reinforced foundation is further improved and can reach 80 kPa or above.

Description

technical field [0001] The invention belongs to a foundation treatment method in the field of civil engineering, in particular to a flat belt lateral expansion combined with vacuum preloading foundation treatment device and method. Background technique [0002] Vacuum preloading is a widely used soft soil foundation reinforcement method, and it has unique advantages especially in dealing with deep and soft clay. The vacuum preloading method was first proposed by W·Kjellman of the Royal Swedish Geological Institute. The author introduced five sets of field test results and proposed a theoretical explanation for vacuum preloading. Since then, research on vacuum preloading has developed slowly. In the 1950s and 1960s in our country, different units carried out exploratory work, but no major breakthroughs were made in theory and engineering practice. Since 1980, the Research Institute of the First Harbor Engineering Bureau of the Ministry of Communications (now CCCC Tianjin Ha...

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Problems solved by technology

The first is that due to the limitation of atmospheric pressure, the characteristic value of the bearing capacity of the foundation after vacuum preloading reinforcement is about 80kPa, which cannot be further improved; although the vacuum combined surcharge method can further improve the bearing capacity of the foundation, it is limited by the acquisition and transportation of the heap materials , the cost is high, and at the same time, in order to ensure that the soil does not damage, it is necessary to control the loading speed during stacking, which affects the construction period

The second is that for clay with a small permeability coefficient, the consolidation rate is slow, which requires a long time for vacuuming, and the cost of electricity and other expenses is high, which affects the construction period.

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