| 摘要 |
A prefabricated form for molding a footing of a settable structural material at the bottom end of a tubular form (10) for a structural pillar is disclosed. The form (10) is preferably constructed from a thermoplastic such as a high density polyethylene or ABS and is molded as a single disposable unit. The form (10) is bell-shaped and has a sidewall (12) which is inclined at an angle of about 45.degree. to about 65.degree. with respect to the bottom edge. A top flange (22) of the form is preferably adapted to accommodate two or more different diameters of the tubular form for the structural pillar. The sidewall may include integral ribs (28) which open inwardly to facilitate evacuation of air as the form (10) is filled and to lend rigidity to the sidewall (12) to ensure that it will not collapse if earth is backfilled around the form before the form (10) is filled with settable material. The advantage is an inexpensive form which fills reliably without the entrapment of air pockets, supports a tubular form for a pillar without cross-pieces, may be left in the ground and actually protects the footing from the intrusion of water, etc. Thus significant savings in labour and a significant improvement in the quality of footings f or structural pillars made using tubular forms is realized.
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