Static structures (e.g. – buildings) – Enclosure including flaccid nonmetallic or foraminous surfacing
Patent
1996-04-30
1999-01-12
Kent, Christopher Todd
Static structures (e.g., buildings)
Enclosure including flaccid nonmetallic or foraminous surfacing
52222, 52426, 52632, 52646, 5274214, E04G 1100
Patent
active
058572937
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to formwork and more particularly but not exclusively to the use of flexible sheet in formwork to form concrete structures for marine and land environments.
BACKGROUND OF THE INVENTION
Traditionally formwork has consisted of rigid material such as sheets. Typically, the sheet would be plywood and would be held in position by timber brace members.
The above discussed traditional formwork is time consuming and expensive to erect.
Further to the above, in-situ casting of concrete structures in wet areas is difficult. This is particularly a problem with forming marine structures due to difficulties which exist in setting up the formwork under water.
OBJECT OF THE INVENTION
It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.
SUMMARY OF THE INVENTION
There is disclosed herein a formwork comprising:
a water impermeable flexible sheet to define at least one side of a space to receive unset concrete;
stress distribution members fixed to a major surface of the sheet at spaced locations, which major surface does not confront said space, said distribution members being adapted to distribute within the sheet stresses, arising from the concrete within the space pressing on the sheet, to thereby aid the sheet to withstand pressure applied to the sheet; and
a plurality of ties, each tie being fixed to and extending from an associated one of the members, the ties extending through the sheet and being fixed so as to support the associated members in a desired position to thereby support the sheet in a desired configuration until the concrete sets.
Preferably, in the above described formwork, the sheet would substantially enclose the space, so that stress distribution members are located on opposite sides of the space with the ties extending therebetween.
Preferably located in the space would be concrete reinforcing members.
Preferably the reinforcing members would support the sheet. Still further, it is preferred that the sheet be supported on the reinforcing members by a height adjustable frame.
There is further disclosed herein a method of erecting formwork, said method comprising the steps of:
providing a substantially water impermeable flexible sheet;
fixing to a major surface of the sheet, a plurality of stress distribution members;
providing a plurality of ties;
suspending the sheet from a fixed point;
securing each tie to an associated stress distribution member and fixing the ties so that the stress distribution members are held in a desired position to thereby hold the sheets in a desired configuration defining at least one side of a space, with the tie members extending from their associated stress distribution members and through the sheet and into said space.
Preferably, in the above described method, the sheet would be arranged so as to substantially enclose the space so that the ties extended through the space so as to extend between two associated stress distribution members located on opposite sides of the space.
Still further, preferably reinforcing members are located in the space prior to pouring of the concrete, and the sheet is supported on the reinforcing.
Still further, preferably spacers are located between the reinforcing members and the sheet securing spacers to the reinforcing cage.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred forms of the present invention will now be described by way of example with reference to the accompanying drawings wherein:
FIG. 1 is a schematic sectioned side elevation of a formwork enclosing a space occupied by concrete;
FIG. 2 is a schematic perspective view of a portion of a wall formed by the formwork of FIG. 1;
FIG. 3 is a schematic side elevation of a portion of the formwork of FIG. 1;
FIG. 4 is a schematic side elevation of a tie employable in the formwork of FIG. 1;
FIG. 5 is a schematic side elevation of a further tie which may be employed in the formwork of FIG. 1;
FIG. 6 is a schematic plan view of a stress distribution member employed in the formwor
REFERENCES:
patent: 3396545 (1968-08-01), Lamberton
patent: 3555751 (1971-01-01), Thorgusen
patent: 3726950 (1973-04-01), Turzillo
Flexible Formwork Pty. Ltd.
Kent Christopher Todd
LandOfFree
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