B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/117, 25/50
B28B 1/24 (2006.01) B28B 21/40 (2006.01)
Patent
CA 1115503
Abstract of the Disclosure Hydraulic cement or the like is poured into a closed mould under a reduced pressure condition to a level slightly higher than a predetermined level. Coarse aggregate and steel rodes are prepacked in the mould. After pouring the pressure in the mould is in- creased to atmospheric pressure or a higher pressure to force the hydraulic cement above the predetermined level back into the space below the level thus compacting the poured in hydraulic cement. A cushion device is provided for the pouring device. An overflow tank is connected to the mould to observe the level of the poured cement. The pressure in the overflow tank is also decreased during pouring and increased after pouring. In this way substantially all the excess water and entrained air is removed from the hydraulic cement before it is poured. By reducing the pressure in the mould pouring of hydraulic cement into the mould is facilitated. The produces so formed are dense and have high mechanical strength.
273526
Ito Yasuro
Kaga Hideharu
Smita Tadayuki
Yamamoto Yasuhiro
Ito Yasuro
Marcus & Associates
Taisei Corporation
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