E - Fixed Constructions – 04 – G
Patent
E - Fixed Constructions
04
G
61/2.4
E04G 15/04 (2006.01) B28B 21/56 (2006.01) E06C 9/04 (2006.01)
Patent
CA 1040844
METHOD AND APPARATUS FOR FORMING STEPS IN MANHOLES AND THE LIKE Abstract of the Disclosure Method ant apparatus for forming steps in manhole structures. Manhole assembly is comprised of pre-cast concrete sections. Each such section is formed in an appropriate mold typically comprised of inner and outer mold shells. The inner shell is provided with pairs of openings arranged in a pre- determined fashion. Plastic core members are snap fittingly inserted into the openings and are provided with resilient pairs of flanges which cooperate with the marginal edges of each opening to retain the core in proper position and align- ment. The concrete is placed in the mold. Once set and cured, the section is removed from the mold. The plastic core members are snapped free from their locked position with the mold inner shell and remain as an integral part of the cured section. U- shaped stepped sections are force fittingly inserted into the cores which serve to retain each step member in position.
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