FIELD: building materials industry, production of prestressed reinforced concrete pieces in thermal form work in particular. SUBSTANCE: thermal form work has tray and side walls, that have thermal compartments and compartments for coolant; lid; tendons mounted in grooves of stops; inlet and outlet branch pipes. In the case tray and side walls have additional compartments for coolant, that are communicating with main compartments and adjacent to other side of thermal compartments. Lid also has compartment for coolant, that communicates with compartments for coolant of side walls and tray, and is provided with mounted at compartment outlet pressure regulator and outlet branch pipe. Stops of tendons are fixed to butts of tray and longitudinal side walls with capability to be detached. EFFECT: improved quality of prestressed reinforced concrete pieces produced in thermal form work. 4 dwg
