On-site grouting system and method for reinforcing flocculated sludge by combining vacuum preloading and grouting

Abstract

The invention discloses an on-site grouting system and a method for reinforcing flocculated sludge by combining vacuum preloading and grouting. The on-site grouting system is composed of an engineering mechanical vehicle, a grouting pipe, a vertical drainage plate, a control electric box, a foam plate, a flocculant pump, a vacuum pump and some conveying pipelines. According to the method for reinforcing the flocculated sludge by combining vacuum preloading and grouting, lime pipe grouting is used as a main process, traditional vacuum preloading is improved through an electrical control technology, modern mechanical equipment is adopted for construction, and therefore, the high efficiency and refinement of construction are achieved, the construction process is simplified, manpower participation is reduced, the safety coefficient of labor is increased, and the working efficiency is greatly improved; and the requirement of traditional vacuum preloading on a site is reduced through a lime grouting mode, the flocculation effect in a soil body is improved, the application range of vacuum preloading is widened, the flocculation effect in the soil body is improved, and the construction period is greatly shortened.

Description

technical field [0001] The invention belongs to the related technical field of geotechnical engineering and hydraulic engineering research, and particularly relates to an on-site grouting system. The present invention also relates to a method for strengthening the sludge by vacuum precompression combined with grouting and flocculation by adopting the above-mentioned on-site grouting system. Background technique [0002] In recent years, with the development of urbanization in coastal areas, large-scale reclamation and construction projects have been carried out. Blowing and filling sludge and engineering mud have high water content, large void ratio and high compressibility. Whether their treatment is appropriate has a considerable impact on the progress of the project. [0003] At present, the traditional measures for sludge treatment are mainly based on the vacuum preloading method. With the development of the times and science and technology, various types of improvemen...

AI Technical Summary

Problems solved by technology

Therefore, the effect of vacuum preloading will be reduced

[0005] 2) Using air pressure splitting vacuum preloading and gas injection pressurized vacuum preloading technology for foundation reinforcement treatment, it is found in engineering practice that air must be blown into the soil continuously through the booster pipe to ensure a stable air pressure difference. Once the gas supply is stopped, the vacuum negative pressure decreases, and the drainage rate drops immediately, resulting in poor soil reinforcement effect, especially the reinforcement treatment effect of deep foundation soil is not satisfactory

[0006] 3) Although new vacuum preloading technologies such as electroosmosis combined with vacuum preloading technology have improved the drainage efficiency of vacuum preloading to a certain extent, and thus accelerated the soil consolidation rate, this method has a relatively high engineering cost and cannot be used in actual projects. It is difficult to carry out large-scale promotion and application

[0007] 4) The commonly used "vacuum preloading method" or "vacuum surcharge combined preloading method" for reinforcement treatment is to insert plastic drainage boards according to a certain grid on the weak foundation, and after the entire vertical drainage channel is established, pass through the corrugated filter. After connecting each drainage board to establish a horizontal drainage channel, and laying geotextile and sealing film on it to isolate the soil from the atmosphere, the overall construction is complicated, costly, and takes a long time, and requires high vacuum formation.

Images