Preparation system and method of rock-fill dam bedding material

Abstract

A preparation system of a panel rock-fill dam bedding material comprises a coarse crushing segment. A first screening segment, an intermediate crushing segment, a second screening segment and a fine crushing segment are arranged below the coarse crushing segment. A main screening segment is arranged below the fine crushing segment, and an ultra-fine crushing segment is arranged below the main screening segment. A first-grade finished bedding taking point is arranged behind the intermediate crushing segment. A second-grade finished bedding taking point is arranged behind the fine crushing segment. A third-grade finished bedding taking point is arranged behind the ultra-fine crushing segment. Finished bedding materials taken from the three grades of finished bedding taking points are all conveyed to a finished product stock dump through a belt conveyor. Under treatment of the effective crushing and screening technology, gradation compositions of materials at all joints in the technology process are controlled, the upstream and downstream multi-grade technology joints are selected as the taking points along with the technology process, and the cost of the finished bedding materials is greatly reduced by means of four segments of crushing and three grades of finished bedding material taking; and the first part and the second part are long-gradation continuous mixtures, a mixing link generated in the stacking, taking and transporting process is gathered into a subsequent sealing-tape machine, and the quality control difficulty is reduced.

Description

technical field [0001] The invention relates to the processing technology of a rockfill dam cushion material preparation system, in particular to a system and method for preparing rockfill dam cushion material with reduced consumption and high quality. Background technique [0002] Cushion materials for face rockfill dams require continuous gradation, the maximum particle size is <75mm, and the particle gradation curve has a strict range. According to the process requirements, the ratio of all levels can be comprehensively 75mm-40mm: 40mm-20mm: 20mm-5mm:< 5 mm = 21:19:19:41. [0003] Among them, the ratio of all grades, the proportion of materials <5mm is equivalent to that of conventional three-grade concrete aggregate, and the content of 40mm~20mm and 20mm~5mm is higher than that of conventional three-grade concrete. The preparation strength of medium, small stone and sand is high, not lower than that of ordinary three-grade concrete aggregate system. [0004] T...

AI Technical Summary

Problems solved by technology

[0006] The cost of the traditional process is high, and it is prone to problems such as discontinuous gradation (coarse materials are concentrated and overhead) due to insufficient mixing, and the permeability coefficient of the cushion material is difficult to meet 10. -3 ~10 -4 cm / s requirement

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