Power grid construction waste slurry or slag integrated treatment and filler utilization method

Abstract

The invention discloses a power grid construction waste slurry or slag integrated treatment and filler utilization method. The method comprises the following steps: conveying power grid construction waste mud or slag excavated on site into a mud pretreatment box to be pretreated; pumping the pretreated power grid construction waste slurry or slag and a curing agent into a curing agent stirring box, and carrying out rapid stirring; pumping the uniformly stirred mixed slurry and a flocculating agent into a flocculating agent stirring box, and slowly stirring; pumping the deposited mixed slurry into a geotextile bag to complete bagging; putting the bagged mixed mud bag into a high-pressure mechanical filter pressing device, and carrying out high-pressure dehydration; conveying the dehydrated geotextile mud bag to an open field in a centralized mode, and stockpiling after maintenance; and conveying the maintained geotextile mud bag to a filling engineering site for filling. According to the invention, the power grid construction waste mud or slag is directly converted into the engineering filler through an integrated treatment process, and the hardened geotextile mud bag filler is subjected to resource utilization.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment in civil engineering, relates to a technology for treating waste mud or slag in power grid construction, and in particular relates to a method for integrated treatment of waste mud or slag in power grid construction and a filling utilization method. Background technique [0002] With the continuous development of the economy, my country is ushering in the peak period of investment in the construction of UHV AC backbone grids and inter-regional UHV DC projects, and the intelligent construction and transformation of urban and rural distribution networks. Projects such as large substations, transmission lines and cable tunnels The number is increasing day by day, and the scale is getting bigger and bigger. During the construction of power grid facilities, the number and scale of projects such as pile foundations, underground diaphragm walls, and mud-water shield cable tunnels are increasi...

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Problems solved by technology

[0006] (1) Storage yard (or long-term sedimentation tank) treatment Due to the long time of mud consolidation and drainage, the storage yard land has become a "waste land" that is difficult to use, and the shortage of urban land resources will inevitably lead to an increase in the storage yard treatment cost; in addition, heavy metals in the mud Pollutants such as pollutants may also cause secondary pollution to surrounding soil and groundwater, causing environmental problems

[0007] (2) The mud cake after traditional mud-water separation and mechanical dehydration has a high pH value, severe hardening and poor engineering mechanical properties, which cannot be directly utilized as a resource. After being washed by rainwater, it is easy to cause pollutants to diffuse; in addition, traditional mechanical dehydration equipment uses rough Particle and fine particle separation treatment mode, including mud-water separation equipment (such as cyclone screener, horizontal screw centrifuge, etc.) It is more and bulky, occupies a larger area, has higher operating costs, and has poor mobility. It is only suitable for projects with large mud (slag) output and concentrated work points (such as mud-water balance shield tunnels, etc.), and it is difficult to It is suitable for power grid construction projects with many scattered work sites

[0008] (3) Chemical solidification treatment can effectively reduce the moisture content of sludge, increase the strength of sludge, and convert the solidified sludge into engineering soil for resource utilization. However, existing studies have shown that the curing efficiency of chemical solidification increases with the increase of sludge moisture A sharp decline

In the existing application cases, the water content of the mud is relatively low (generally <1.5LL), but for the wide-graded waste engineering mud (slag) with a high water content, direct solidification treatment has little effect

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