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.

Inactive Publication Date: 2019-09-20
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting method uses a certain pressure to inject the curing agent slurry into the soil. It does not need to be stirred with the soil and has little damage to the soil structure; Flow, seepage, flow direction of slurry and distribution of slurry in soil are completely random and uncontrollable
Therefore, the density and porosity of the various parts of the obtained grouting body are not uniform, and its engineering properties such as...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention discloses a vacuum negative pressure grouting method and device, and belongs to the technical field of geotechnical engineering construction. A working body which is capable of passing the vacuum negative pressure in the full length range and grouting slurry is parallelly inserted into a foundation according to the designed spacing and depth, and the system is isolated from the outside air; vacuumizing is conducted on a part of the working body, and the slurry is grouted from the other part of the working body; the slurry can be evenly grouted into the foundation according to the designed space in the breadth and depth range of inserting of the working body due to attraction of the vacuum negative pressure, thus the intensity of a soil body is improved, and the permeability is lowered; and the vacuum negative pressure grouting method and device can be used for manufacturing underground water stop curtains, and improving the foundation bearing capacity and anti-permeability of newly-built buildings and existing buildings. According to the vacuum negative pressure grouting method and device, the soil body structure is not destroyed, and the intensity and anti-permeability of the soil body are enhanced on the original basis; the quality of the grouting slurry can be controlled, the using amount of a curing agent is lowered, the groutability of the slurry in soil bodies with low permeability is improved, and different components of the curing agent can be grouted respectively; and construction can be conducted on narrow and small spaces of cities.

Description

technical field [0001] The invention relates to a vacuum negative pressure grouting method and device, belonging to the field of geotechnical engineering. Background technique [0002] Grouting is a commonly used technique in the field of geotechnical engineering. The grouting method is to use a certain pressure to inject the curing agent slurry into the soil. Through the filling and cementing effect of the curing agent on the soil, the strength of the soil can be improved and the permeability of the soil can be reduced. The grouting method can be used to strengthen the foundation, improve the bearing capacity and impermeability of the foundation, and can also be used for remedial measures for foundation failure of in-service buildings or structures. The grouting method uses a certain pressure to inject the curing agent slurry into the soil. It does not need to be stirred with the soil and has little damage to the soil structure; Flow, infiltration, flow direction of slurr...

Claims

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Application Information

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IPC IPC(8): E02D3/00E02D3/12
CPCE02D3/00E02D3/12
Inventor 刘金龙李建平侯恩品黄新宋伟杰
Owner BEIJING ZHONGYAN DADI TECH CO LTD
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