METHOD FOR PRECAST CONCRETE AND REINFORCED CONCRETE BUILDING STRUCTURE PRODUCTION AND FOR CAST-IN-PLACE CONCRETE AND REINFORCED CONCRETE BUILDING STRUCTURE ERECTION Russian patent published in 2006 - IPC E04G21/00 B28B11/24 C04B40/02 

FIELD: building, particularly for concreting cast-in-place and precast reinforced concrete structures along with concrete curing temperature regulation.

SUBSTANCE: method involves laying and compacting concrete mix under continuous concrete mix curing temperature control; heating central concrete layers with heating reinforcement when outer concrete layers are in elasto-plastic state. Heating reinforcement is spaced a distance "a" from surface. The heating is carried out simultaneously with surface heat-shielding. Distance "a" is determined as a=δ_eq(t_av-t_s)/(t_s-t_a), m, where δ_eq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, R_s, m; t_av - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; t_s - time-average temperature at concrete surface calculated by estimated heating time, deg; δ_eq is determined as δ_eq=R_s·λ·F, m, where R_s is heat resistance of rigging with form R_r including thermal resistance R_a of heat transfer from rigging to ambient air, h·deg/kcal; R_s=R_r+R_a=(δ_r/( λ_r·F))+(1/(α·F)), h·deg/kcal, where δ_r is thickness of rigging, m; λ_r is rigging heat conductivity factor kcal/(m·h·deg), α is rigging surface heat-transfer coefficient kcal/(m²·h·deg), λ is concrete(reinforced concrete) heat conductivity kcal/(m·h·deg); F=1m² - rigging surface area for thermal resistance calculation, m². Amount of heat Q used to heat part of member to be heated having length (height) of 1.0 m and cross-sectional width of 1.0 m is determined from Q=(tav-ts)(m+(τ·λ·F/a), where m is constant equal to 60-180 kcal/deg and τ is calculated heating time, hours. The heating reinforcement is heating wires or pipes adapted for hot water circulation.

EFFECT: reduced temperature stresses and prevention of crack formation during structure concreting, as well as possibility to regulate curing temperature.

4 cl, 1 ex, 4 dwg