SPILLWAY STRUCTURE OF ACCUMULATOR OF HARDENING INDUSTRIAL WASTES Russian patent published in 2011 - IPC E02B7/06 

FIELD: construction.

SUBSTANCE: spillway comprises discharge well, foundation part of which is coupled with drain pipe made of metal and equipped with protective coating from outside. Protective coating is arranged from polymer material, comprising plasticiser in amount to produce smooth and low-energy external surface of drain pipe. Calculated value of tangent stresses τ_c, specified by specific forces of adhesion of hardening wastes with surface of discharge pipe and friction forces between them, complies with requirement τ_c≤2σ_n ²·δ_c/a_c·E_c, where σn - calculated (permissible) value of increment of stretching stresses in wall of drain pipe as cracks open in hardening wastes and cross this pipe; δ_c-calculated thickness of drain pipe wall; a_c - design value of crack opening; E_c - calculated module of elasticity of drain pipe wall material in stretching.

EFFECT: reduced forces of discharge pipe adhesion with hardened wastes and better capability of protective coat in deformation of discharge pipe to be released from forces of adhesion with hardened wastes.

3 cl, 2 dwg