Porous guniting bidirectional three-dimensional stirring synergistic device and method for solidifying/oxidizing polluted soil

Abstract

The invention discloses a porous guniting bidirectional three-dimensional stirring synergistic device and method for solidifying / oxidizing polluted soil. The device comprises a stirring shaft, a three-dimensional stirring head, a slurry conveying header pipe, a slurry conveying branch pipe, a guniting nozzle, a spiral blade and a drill bit. According to the device, an all-dimensional porous guniting and bidirectional three-dimensional stirring synergistic mode is adopted, the cutting and stirring capacity is greatly improved through the bidirectional three-dimensional stirring head, agent slurry is fully diffused in a soil body at the proper stirring rotating speed and the rotary jet pressure, the mixing uniformity of an agent and the soil body is improved, the agent effect is better, the heavy metal solidification rate / organic matter removal rate is increased, and the polluted soil is treated more thoroughly. According to the device, the mixing uniformity of the agent and the soil body is guaranteed, the guniting stirring construction process is optimized, unnecessary procedures and material waste are avoided, and the construction efficiency and the construction quality are improved.

Description

Technical field[0001]The invention belongs to the field of civil engineering technology, and further relates to the field of in situ repair technologies, in particular, to a spray mixing apparatus and method for contaminated soil in situ curing / oxidation.Background technique[0002]With the repair of pollution venue, the geotechnical construction technology is also used in the field of soil in the field of soil in China. At present, my country's main construction techniques for treating foundations are: deep stirring, high pressure spinning method, triaxial stirring.[0003]The deep stirring method is to deliver the slurry to the soil of soil by low pressure slurry pump (pressure is generally less than 2 MPa), and the soil and the agent are directly mixed by stirring the blade. Conventional stirring is simple, the construction speed is fast, the cost is low; however, due to insufficient mechanical power, the pump slurry pressure can cause a limited range of formation ranges, and the u...

AI Technical Summary

Problems solved by technology

In order to make the mixing more uniform, the slurry and the soil are fully stirred through the spiral blade on the stirring shaft. During this process, the slurry and some displaced soil clods fall into the hole, resulting in uneven mixing at the lower part of the mixing body.

[0006] The existing technology often has the following problems when it is applied in the in-situ remediation of contaminated soil: the contaminated soil with high viscosity is difficult to be fully broken to form uneven large aggregates, and the uniformity of mixing with the agent is poor; the curing agent tends to clay The scope of influence of the internal diffusion of the aggregate is limited. When the interior of the aggregate expands and shrinks due to the influence of the environment, the external solidified layer will crack, which will cause the deterioration of the long-term durability of the solidified contaminated soil.

Based on this, a new type of coordinating device and method for shotcrete mixing is designed to solve the problem of uniformity of the mixture of chemicals and contaminated soil

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