| 摘要 |
FIELD: hydraulic building, particularly to perform concrete works in winter period. ^ SUBSTANCE: air blowing device comprises concrete heaters and heat insulation means. The heaters include parallel perforated pipe system laid on concrete mix over dam slope and connected with air vessel by common channel. The air vessel is provided with fan. Perforated pipe system is covered with polyethylene film. Perforated pipes have spaced apart orifices. Orifice dimensions and distance between the orifices may increase in direction from steam inlet to provide uniform slope revetment heating over the full area thereof. Propeller is built in air vessel to provide helical air flow movement. Hot air supplied to heating system is generated in the vessel by boiling water with heat from heat source. ^ EFFECT: increased uniformity of concrete heating over the full slope revetment area, reduced energy resource consumption and improved temperature and moisture conditions for concrete hardening. ^ 3 cl, 5 dwg |
