TWO-STEPPED DIFFERENCE COMBINED CONSTRUCTION

摘要

FIELD: construction.;SUBSTANCE: invention relates to hydraulic engineering and can be used as a mating structure for control of sections of small rivers and channels in earth channels on plains and foothills. Two-stage drop comprises an inlet spillway reinforced concrete wall 1, water wells of first 3 and second 4 stages, a reinforced concrete wall 5 between the steps and side enclosing walls 2. Gabion mattresses with filler made of sacks 9 with local soil and gravel layer 10 are laid in the base of water-bore well-stairs all over their area. Thickness of mattresses is 0.5–0.7 m. Under gabion mattresses there laid is coarse mesh reinforcement mesh 7, on top of which geogrid 8 is laid and attached. Gabion net stretched over the gravel layer is attached to enclosing walls 2 and reinforcement grid 7 in the base. In the wells of first 3 and second 4 steps from above the gabion mattresses and between enclosing walls 2 there are arranged reinforcement grate frames 12 with cells of not more than 1.0×1.0 m. Reinforcing frames 12 are of trapezoidal shape with increasing height from the beginning of the well to its end part, from 0.2–0.3 m to 0.5–1.5 m. Two-stage differential of combined structure provides effective damping of excessive energy of water flows and reliability of operation of whole structure in conditions of flat and foothills sections of channels and channels of small rivers.;EFFECT: differential has flexibility and water permeability and can be effectively used for stabilization of erosion channel processes on flat and foothill adjustable sections of urbanized zones of small rivers and earth discharge channels.;1 cl, 5 dwg