Cutting-suction hydraulic-fill/filling damming method for ash storage yards in power industry

Abstract

The invention relates to a cutting-suction hydraulic-fill/filling damming method for ash storage yards in power industry. The method includes the steps of treating a dam foundation and a dam abutment; laying a seepage pipe system on the dam foundation; installing an underwater ash delivery pipe system, an ash dredger and an overwater ash delivery pipe system according to a dam design drawing; building a plurality of hydraulic fill pond ridges on the dam foundation; making and delivering mud; filling a hydraulic fill pond; separating ash and water; mechanically tamping; and performing multilayer hydraulic filling to the hydraulic fill pond till filling of a dam is complete. The multilayer segmental hydraulic fill pond ridges are built first, a small cutter-suction ash dredger is used with a slurry pump to mix grey water and fly ash in an ash storage yard into slurry which is delivered to the hydraulic fill pond of the dam, an ash dam forms after ash and water separate and solidify, the dam solidifies for three-dimensional drainage, ash-water separation and solidification are fast, water waste is low, dam building speed is high, construction period is short, safety is high, waste is utilized, and service life of the ash storage yard is prolonged. In addition, lift is avoided, pollution is avoided, construction is environment-friendly and the method is highly applicable.

Description

[0001] technical field [0002] The present invention relates to a cutter-suction blowing / flushing dam construction method for ash storage yards in the electric power industry, in particular to blowing / flushing slurry making during the construction work in mud-like fine particle fly ash and underwater fly ash slurry making areas. Damming method. Background technique [0003] The current ash storage field dams adopt traditional dam building methods such as rolling dams and rockfill dams. The use of clay or fly ash or mountain slag to roll dams is a more traditional dam building method. Technology, through layered laying, layered rolling, to reach a certain design technical index, so that continuous layered construction can meet the design requirements. The disadvantages of the existing damming technology of ash storage yards are: different ash storage yards have different dam foundation conditions. In case of soft foundation, large machinery such as excavators, loaders, etc...

AI Technical Summary

Problems solved by technology

The disadvantages of the existing damming technology of ash storage yards are: different ash storage yards have different dam foundation conditions. In case of soft foundation, large machinery such as excavators, loaders, etc. Leveling and rolling are carried out, but the foundation cannot be cleaned and rolled; when the dam is constructed by rolling, the dam material cannot reach the optimal moisture content, and the dam material needs to be turned over in the sun, which is easy to generate dust pollution and cause damage to the surrounding environment. Impact: There are many construction processes of rolling dam construction, and more large-scale construction machinery needs to be invested, which will cause greater noise pollution during the construction period; and in rainy weather, the on-site roads cannot meet the traffic of construction vehicles, which may easily cause interruption of dam construction , will affect the construction period, slow down the construction progress, the construction cost is high, and the overall cost of the project is high; in addition, the rolling dam construction is close to the water area, the safety of the construction operation is poor, the cost of the measures is high, and the construction period is more likely to be affected

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