DEVELOPMENT OF LARGE DIAMOND TIPPED SAWS AND THEIR APPLICATION TO CUTTING LARGE RADIOACTIVE REINFORCED CONCRETE STRUCTURES
The object of this research was to develop a large circular saw, capable of cutting away, by remote control, the inner radioactivated layer of reinforced concrete biological shields or prestressed concrete pressure vessel of gas cooled reactors. Initial investigations and enquiries put to the existing saw industry established although there were blades in use approaching the size and type required, the development of large machines was restricted to the fixed bed type because there was little demand for deep sawing in the construction or demolition industry. Preliminary work was carried out in 1981 to demonstrate the largest available wall saw at that time which showed that by changing the blade three times, a kerf 810 mm deep could be achieved. From this demonstration, the design and development of a free frame saw and construction of a 660 mm blade as well as a 2500 mm blade, were performed. Initially, the 660 mm blade was used to cut the concrete and reinforcement, followed by the 2500 mm blade to produce a 1 m kerf. Subsequent development and testing demonstrated that the 2500 mm blade could be controlled to plunge cut, that is, to cut straight down in the reinforced concrete to a depth of 1 m in 7 minutes and would then advance at 160 mm/min; this is a work rate of 10 m**2/hr. The final demonstration was to mount the saw on an extensible boom and remove a 1 m**3 block of reinforced concrete from the vertical face of a test wall.
Bibliographic Reference: EUR 9499 EN (1985) FS, 27 P., BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123028300 / Last updated on: 1987-01-01
Available languages: en