Construction method of hdpe liner bottom of large concentration tank

Abstract

The invention relates to a concentration tank, and discloses a construction method for the HDPE (high-density polyethylene) liner bottom of a large-sized concentration tank. The construction method comprises the steps of checking the thickness, strength and the like of an HDPE liner according to the stress analysis and calculation of the concentration tank; transporting an HDPE liner material manufactured in a factor to the site; after the construction of the bottom structure of the concentration tank is completed, backfilling earthwork, flattening and tamping the base surface, removing sundries with sharp edges and corners, and repairing the slope surface; spreading sand on the earthwork surface slope, and spreading gravels without sharp edges and corners within a platform; paving the bottom layer and the two top layers of HDPE liners according to the shape of the tank bottom; forming a drainage layer in the middle, and arranging seepage blocking lines between the two layers of HDPE liners; fixing two sides of the paved liners with the side wall of a top plate of a central bottom flow pump station and the tank wall base by using stainless steel chemical bolts respectively; and compacting and fixing the bolts and the liners with rubber plates, steel plates and gaskets, and sealing the surface with a waterproof sealant. The construction method solves the problem of seepage of the bottom structure of the concentration tank, and greatly shortens the construction period, so as to reduce the cost.

Description

technical field [0001] The invention relates to a concentration tank, in particular to a construction method for the liner of the concentration tank. Background technique [0002] Concentration tanks are the main structures in metallurgical mine projects. The diameter of large-scale concentration tanks is generally more than 50 meters. Reinforced concrete structures are generally used, and the construction method of piecewise pouring is adopted. A large number of on-site construction personnel are required to bind steel bars, formwork and Concrete pouring and curing work. [0003] However, for the thickening tank with a diameter of nearly 100 meters, there are certain problems in the existing reinforced concrete structure. Taking the two 90m diameter tailings thickening ponds in the beneficiation area of ​​the SINO IRON iron ore project in Western Australia as an example, the original design adopts the form of reinforced concrete structure, and the total amount of reinforce...

AI Technical Summary

Problems solved by technology

The volume and surface area of ​​the thickening tank are large. If the reinforced concrete structure is used, the hydration heat generated by the cement will cause large temperature changes and shrinkage in such an environment due to the large amount of cement used, which will cause cracks in the concrete.

Even if protective measures such as pouring in different areas at intervals, covering with felt cloth and watering for maintenance are taken during the concrete construction process, it is still difficult to solve the problem of cracks

At the same time, it will also result in a longer construction period and higher costs for special measures, resulting in higher construction costs.