Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1980-12-22
1982-06-15
Dixon, Jr., William R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
138175, 138176, 264228, 405 43, 405 45, F16L 900, E02B 1100
Patent
active
043351697
ABSTRACT:
Concrete pipe including a hollow tube of concrete with a grid of reinforcing bars embedded therein. A plurality of inserts are embedded in the concrete pipe in between the bars of the grid and have passageways therethrough to form slots between the interior of the concrete pipe and the exterior thereof at predetermined locations to form slotted concrete pipe. The inserts are attached to the grid of reinforcing bars during formation of the pipe and the concrete is introduced to surround the grid and inserts and is permitted to set. Thereafter, the formed concrete pipe contains embedded reinforcing bars and inserts in predetermined locations resulting in a slotted reinforced concrete pipe.
REFERENCES:
patent: 2009163 (1935-07-01), Chesleg
patent: 2660199 (1953-11-01), Montgomery
patent: 3275040 (1966-09-01), Hausmann et al.
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