Vacuum negative pressure grouting method and device
A vacuum negative pressure and grouting technology, which is applied in the field of geotechnical engineering, can solve problems such as difficulty in uniform injection, uncertain engineering properties such as strength and permeability, and uneven density and porosity.
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Embodiment 1
[0030] The polluted soil site of an abandoned factory plans to adopt the method of sealing and blocking to prevent the spread of pollutants on the site. The design requires that a 10m-deep grouting water-stop curtain should be built around the polluted soil site, and a grouting back-sealing water-stop layer should be made in this area at the same time. The permeability coefficient of the site soil is 3.15 10-5cm / s. The vacuum negative pressure grouting method of the present invention is used to manufacture a water-stop curtain and a bottom-sealing water-stop layer.
[0031] Considering that the soil layer above 2m above the ground needs to be harmlessly treated by other methods, the depth of the top surface of the water-stop curtain is -1.5m, and the depth of the bottom surface is -10m; the depth of the top surface of the bottom-sealing water-stop layer is -8m. The depth of the bottom surface of the water layer is -10m.
[0032] Arrange a row of strip-shaped working bodies c...
Embodiment 2
[0037] In a small space in a residential area of a city, the bearing capacity of the foundation must be increased from 50 kPa to 100 kPa for public structures to be built. The foundation is newly filled soil with a permeability coefficient of 1.05 10-6cm / s. The vacuum negative pressure grouting technique of the present invention is used for foundation reinforcement.
[0038] On the site, the pole-shaped working bodies B are arranged at a vertical and horizontal interval of 1m, and the implantation depth of the pole-shaped working bodies B is 8m. The adjacent working bodies in each row of working bodies are respectively connected to the vacuum negative pressure source and the slurry supply source, and the adjacent working bodies in each row of working bodies are also respectively connected to the vacuum negative pressure source and the slurry supply source, that is, any working body in the horizontal plane Connect the vacuum negative pressure source and the liquid supply sou...
Embodiment 3
[0042] An ancient building with a masonry structure and a wall thickness of 70cm; the masonry strip foundation below it is 100cm wide; because the underlying foundation has deteriorated under the long-term adverse environment, it needs to be reinforced. The foundation is clay with a permeability coefficient of 1.05 10-7cm / s. The vacuum negative pressure grouting technique of the present invention is used for foundation reinforcement.
[0043] On both sides of the masonry strip foundation, close to the masonry strip foundation, arrange the rod-shaped working body B without the outer filter layer at a distance of 0.5m, and the implantation depth of the rod-shaped working body B is 10m. Cover the plastic film along the wall base. One side of the plastic film is pasted on the wall base, and the other side is extended to a width of 1m. The plastic film is covered with 0.5m thick soil, so that the soil implanted under the wall base and on both sides of the working body is in contact...
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