System and method for washing, filtering, purifying and separating sandy soil in foundation pit excavation

Abstract

The invention relates to the technical field of foundation pit construction, in particular to a system and method for washing, filtering, purifying and separating sandy soil in foundation pit excavation. The system comprises a feeding device, a separating device, a sand washing device and a dewatering device. The feeding device comprises a cleaning tank and a chain bucket conveyor, wherein one endof the chain bucket conveyor is arranged in the cleaning tank and used for conveying the residual sludge soil in the cleaning tank to the separating device, the separating device comprises a roller screen used for screening and separating the particle size of the residual sludge soil conveyed by the chain bucket conveyor, the sand washing device is used for washing fine materials screened by theroller screen, and the dewatering device comprises a dewatering screen used for carrying out vibration dewatering on the fine sand washed by the sand washing device, so that the excavated sandy soil can be subjected to mud and sand separation near a foundation pit construction site, separated finished sand can be reused, and the system has remarkable economic benefits; and compared with transportation building residual sludge, the generated waste sludge is high in reduction degree, low in water content and convenient to transport, and the transportation cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a system and method for washing, filtering, purifying and separating sandy soil from foundation pit excavation. Background technique [0002] With the rapid development of urban construction, a large number of high-rise buildings have been built in various places, and more and more deep foundation pits have appeared in people's field of vision, followed by a large amount of residual mud and slag generated during the excavation process. [0003] The traditional disposal of sludge and slag is mostly carried by dump trucks to the government-designated sludge and slag receiving site for backfilling. The setting of the residue storage field will occupy a large amount of land resources, and a large number of environmental and safety problems will arise during the operation of the storage field. For example, due to the increasing shortage of urban land resources, th...

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Problems solved by technology

For example, due to the increasing shortage of urban land resources, the number of waste sludge receiving sites is limited, and they are usually located in remote locations. The waste sludge needs to be transported over long distances, which takes a long time and consumes high energy consumption, occupying valuable road resources in the city; Insufficient storage space leads to random discharge of muck, causing blockage of urban municipal pipe network and environmental pollution; at the same time, due to the high body of dump trucks and large blind spots, traffic safety accidents caused by dump trucks occur frequently; in addition, with the national With the improvement of environmental governance and water environment by the local government, river sand mining has been curbed, sand resources are in short supply, and the market price of building materials has been rising steadily

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