| 摘要 |
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=deltaeq(tav-ts)/(ts-ta), m, where deltaeq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, Rs, m; tav - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; ts - time-average temperature at concrete surface calculated by estimated heating time, deg; deltaeq is determined as deltaeq=Rs.lambda.F, m, where Rs is heat resistance of rigging with form Rr including thermal resistance Ra of heat transfer from rigging to ambient air, h.deg/kcal; Rs=Rr+Ra=(deltar/( lambdar.F))+(1/(alpha.F)), h.deg/kcal, where deltar is thickness of rigging, m; lambdar is rigging heat conductivity factor kcal/(m.h.deg), alpha is rigging surface heat-transfer coefficient kcal/(m2.h.deg), lambda 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+(tau.lambda.F/a), where m is constant equal to 60-180 kcal/deg and tau 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 |
