Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Patent
1974-09-25
1976-04-13
Husar, Francis S.
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
135 2, 135 20R, 249212, E04G 1136
Patent
active
039499626
ABSTRACT:
A collapsible and reusable umbrella concrete form for casting a concrete shell roof in the form of a dome, the collapsible umbrella form comprising a central stem or column equipped with a base, a jack abutment plate for vertically adjusting the stem in respect to the base, the jack abutment plate being immediately above the base, a rib support connector at the top of the column, and a plurality of strut connectors slidably carried by the central portion of the column, each being axially displacable along the column but keyed so as to be non-rotatable in respect to the column. The top connector of the column releasably receives the upper end of each rib support, each rib support being radially disposed outwardly and arcuately downwardly from said top column connector, the array of rib connectors in plan view giving the appearance of radial spokes, each equally angularly spaced from the next, and being connected one to the other by a plurality of ring members, one ring member defining the outer periphery of the form. Each rib support is held in the described arcuately depending disposition against collapse by three diagonal strut members bridging between an intermediate location along the rib support and one of the strut connectors. The degree of arc and the effective radius spanned by the rib supports may be varied within limits depending upon the relative position of the strut connectors along the length of the column. A suitable jack or like mechanism is used to position the strut connectors along the column and once said connectors are placed as desired, one or more pins may be used to retain that location. To compensate for changes in the circumference of the outer ring caused by displacement of the strut connectors a turnbuckle mechanism comprises part of the outer ring. Radial panels are flush with the top of the rib supports and span between the rib supports and the ring members over at least the distal one half of the array of ring and rib support members. These panels may be fabricated of any suitable material such as plywood to support concrete as it is placed and to leave an acceptable interior roof surface once the umbrella concrete form is removed by relaxing the rib support members as a result of lowering the strut connectors along the column. A sheet of fabric such as nylon is placed over the entire upper surface of the form and is installed in such a way as to become taut when the form is upwardly and outwardly flexed so that it not only supports concrete between the rib and ring members where no support panel exists but also leaves a suitable exposed roof surface once the form has been removed. Once assembled with the sheet of fabric across the top of the form, a thin layer of concrete is placed over the fabric and also upon precast concrete or like pre-existing structural columns disposed along the periphery of the form. The pre-existing structural columns support the concrete roof once it has set and cured and the form has been removed.
REFERENCES:
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patent: 3213868 (1965-10-01), Forbes
patent: 3626958 (1971-12-01), Ross
Foster Lynn G.
Husar Francis S.
McQuade John
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