TWO-STEP CROSSHEAD OF COMBINED STRUCTURE Russian patent published in 2017 - IPC E02B3/02 

FIELD: construction.

SUBSTANCE: two-step crosshead includes an entry threshold 1, baffle steps 2, 10 and enclosing side walls 17. At the base of steps 2, 10 gabion mattresses 3, 11 with a thickness of 0.3-0.5 m are laid over the entire area. Cellular rectangular box constructions of reinforced concrete square-section beams are arranged on top of the gabion mattresses 3, 11. At the end of each step 2, 10, the height of the transverse beam is increased to 1.5 m and more for its operation as a baffle wall 7, 15. The baffle wall 7 is combined with a reinforced concrete drainage wall 8 at the end of the first step 2, and the baffle wall 15 is combined with a transverse beam 14 at the end of the second step 10. The box structure cells above the gabion mattresses 3, 11 of each step are loaded with macrofragmental stone material 9, 16 with a thickness of 0.5-1 m. At the same time, in the baffles of each step, the reinforced concrete beams of the box structure are rigidly connected to one another and to the drainage wall and are delimited with side enclosing walls 17 with expansion joints. The proposed two-step crosshead as a coupling structure can be most effectively used to stabilise eroded channel processes on mountain and foothill regulated areas of urbanized zones of small rivers and earth wasteways where the concentrated difference in the channel marks does not exceed 3…3.5 m.

EFFECT: effective excess energy dissipation of water flows and operation reliability of the entire structure.

2 cl, 4 dwg