AU2008101101A4

AU2008101101A4 - Cast-in fire collar adaptor

Info

Publication number: AU2008101101A4
Application number: AU2008101101A
Authority: AU
Inventors: Jason Harris
Original assignee: Promat Australia Pty Ltd
Current assignee: Promat Australia Pty Ltd
Priority date: 2007-11-20
Filing date: 2008-11-11
Publication date: 2008-12-11
Anticipated expiration: 2016-11-11

Description

Regulation 3.2

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR AN INNOVATION PATENT

ORIGINAL

Name of Applicant: Promat Australia Pty Ltd Actual Inventor: Jason Harris Address for Service: MADDERNS, First Floor, 64 Hindmarsh Square, Adelaide, South Australia, Australia Invention title: CAST-IN FIRE COLLAR ADAPTOR Details of Associated Provisional Application No: 2007906344 dated 20 November 2007 The following statement is a full description of this invention, including the best method of performing it known to us: FIELD OF INVENTION 00 This invention relates to a building product and more particularly to a building product used in multistorey buildings in association with formwork.

0 5 BACKGROUND It is known to use a fire collar in a situation where a plastics pipe extends through a wall or floor of a building and it is desired to have an arrangement where the fire collar will close off an aperture through the wall or floor in the event of a fire. It is desirable to mount such fire collars into poured concrete floors but where steel formwork decking is used it is difficult to provide a reasonable seal around such a fire collar particularly where ribs in the decking interfere with the positioning of the fire collar.

00 It is the object of this invention to provide an adaptor which will assist placement of a fire collar in such a situation or to at least provide a builder with a useful alternative product.

DESCRIPTION OF THE INVENTION In one form therefore, although this may not necessarily be the only or broadest form invention is said to reside in a cast-in fire collar adaptor comprising a plate portion, the plate portion having a width and a length, the length being sufficient to span at least three ribs ofa formwork decking in use, an aperture in the plate portion to receive a fire collar therethrough, and a skirt extending around the periphery of the aperture, the skirt extending away from the plate portion.

Preferably the aperture is of a shape selected from circular, square or rectangular.

The plate can comprise a width of from 25 cm to 45 cm and length of from 40 cm to 60 cm and the skirt has length of from 50 to 120 mm. The length of the skirt is dependent upon the height of the ribs of the formwork decking upon which it is intended to be installed. In some cases it may be less than 50 mm.

Where the aperture is circular it can have a diameter of from 100 mm to 200 m. Where the aperture is square it can have sides of from 100 mm to 200 m. Where the aperture is rectangular it can have sides of from 100 mm to 200 m. The diameter or side dimension is dependent upon the type of fire collar to be installed. For electrical conduit and some plumbing pipes the diameter or side dimension may be less than 100 mm.

In an alternative form the invention is said to reside in a cast-in fire collar adaptor for formwork decking, the formwork decking being of a type having ribs extending longitudinally and extending a first distance above a deck level, the ribs being transversely spaced apart by a second distance, the cast-in collar adaptor comprising a plate portion, the plate portion having a width and a length, the length being sufficient to span at least three ribs of the decking in use, an aperture in the plate portion to receive a fire collar therein, and a skirt extending around and away from the periphery of the aperture, the skirt 00 extending the first distance away from the plate portion.

It will be seen that by this invention there is provided an adaptor which can be mounted onto steel O 5 decking formwork and onto which a fire collar can be mounted before pouring of concrete. The plate Z provides a smooth surface upon which to mount a fire collar and the skirt defines a void in the formwork into which the fire collar can extend without interfering with formwork support during concrete pouring.

The dimensions of the various forms of formwork decking vary considerably and hence the cast-in collar adaptor of the present invention may be supplied in a size to suit a particular form and dimension of decking or may be supplied in a universal size which can be cut on-site to the size necessary for a 00 particular decking. Cutting on-site may be particularly useful for the length of the skirt necessary for a particular decking because rib height can vary considerably between formwork heights and to allow for all of them a large inventory would be necessary. Skirts may be marked with selected heights for different decking.

DESCRIPTION OF DRAWINGS This then and generally describes the invention but to assist with understanding reference will now be made to the accompanying drawings which show preferred embodiments of the invention.

In the drawings: Figure 1 shows a first embodiment of cast-in fire collar adaptor mounted onto decking formwork according to the present invention; Figure 2 shows an alternative embodiment of cast-in fire collar adaptor mounted onto steel decking formwork according to the present invention; Figure 3 shows a transverse cross-sectional view of the fire collar adaptor of Figure 1 according to the present invention cast into a concrete floor with a fire collar mounted onto it; Figures 4A and Figure 4B show a plan and elevation view of one embodiment fire collar of adaptor according to the present invention; Figures 5A and 5B show a further embodiment of fire collar adaptor according to the present invention; Figures 6A and 6B show a still further embodiment of fire collar adaptor according to the present invention; and Figure 7 shows the embodiment of Figure 5A and 5B with markings on the skirt for different forms of formwork.

DESCRIPTION OF PREFERRED EMBODIMENTS 00 Now looking more closely at the drawings and in particular Figure 1 it will be seen that a steel formwork decking 10 includes a planar portion 12 and longitudinal ribs 13 extending a distance 15 above the planar portion 12. The ribs are spaced apart by a distance 17.

_The cast-in collar adaptor 20 comprises a plate portion 22 and a skirt 24 extending down from the plate portions around the periphery of an aperture 26. In this embodiment the aperture 26 is square. The plate portion 22 is screwed by means of screws 28 to adjacent ribs 13 and the skirt 24 extends down to the deck Slevel 12. Mastic or other suitable sealing material 30 is provided to seal the skirt to the decking. An aperture 32 is cut in the decking and provides access for a fire collar as will be discussed in relation to Figure 3. The cast in collar adaptor when bolted to adjacent ribs assist with maintaining the strength of 00 the formwork decking after it has had a hole cut through it.

The plate 22 in this embodiment only needs to be of sufficient length to span two ribs because the aperture 32 is between ribs. Hence the plate is of a length somewhat greater than the length 17 and preferably at least twice the length of the dimension 17.

Figure 2 shows as an alternative embodiment of cast-in collar adaptor according to the present invention.

In this embodiment the cast-in collar adaptor 40 has a substantially circular aperture 42. The plate 44 of the adaptor 40 is of sufficient length to extend across three ribs because in this embodiment the desired position for the adaptor is such that the rib 13a has had to be cut to fit a fire collar in the desired place.

The plate 44 provides sufficient strength to reinforce the steel formwork in the region of the fire collar to allow for the fact that a cut has been made in the rib 13a. The plate portion 44 is screwed by means of screws 45 to three adjacent ribs 13 and the skirt 46 extends down to the deck level 12. Mastic or other suitable sealing material 48 is provided to seal the skirt to the decking. An aperture 49 is cut in the decking and provides access for a fire collar.

Figure 3 shows a cross sectional view of the embodiment shown in Figure 1 with a fire collar mounted in place and concrete poured. It can be seen that the skirt 24 is sealed to the decking 12 by means of mastic 30 and the collar adaptor 20 is mounted into the ribs by means of bolts 28. The fire collar 50 is mounted onto the adaptor 20 with its flange 52 screwed to the adaptor by its screws 54. The fire collar 50 has short lower pipe 56 which when mounted onto the adaptor does not extend as far down as the plate level 12 so that it does not obstruct formwork support underneath the decking level during concrete pouring but after the decking support has been removed a pipe such as the pipe 58, shown dotted, can be mounted to it.

At its upper level the fire collar 50 has a short pipe 60. Once again, after pouring of concrete 62 a length of pipe 64, shown dotted, can be connected to the short pipe 00 Alternatively the fire collar may be of a type in which a separate pipe (not shown) extends completely through the fire collar.

O 5 Figures 4A and 4B show an alternative embodiment of fire collar adaptor 70 which the plate 72 has a z rectangular aperture 73 with a peripheral skirt 74. The skirt extends through the aperture 72 and small flanges 76 folded at the top are spot welded to the plate by spot welds 78.

SIn a preferred embodiment the plate 72 and skirt 74 are constructed from galvanized steel of 1 mm thickness. The plate can have dimensions of width of 25 cm to 45 cm and a length of from 40 cm to _cm. The skirt can have a length of from 50 mm to 120 mm. The rectangular aperture can have sides of 00 from 100 mm to 200 mm.

Figures 5A and 5B show an alternative embodiment. In this embodiment the cast-in collar adaptor 80 has a plate 82 with a circular aperture 83 with a skirt 84 extending down from it. The skirt 84 extends through the aperture 83 and small flanges 86 folded at the top are spot welded to the plate by spot welds 88.

In a preferred embodiment the plate 82 and skirt 84 are constructed from galvanized steel of 1 mm thickness. The plate can have dimensions of width of 25 cm to 45 cm and a length of from 40 cm to cm. The skirt can have a length of from 50 mm to 120 mm. The circular aperture can have a diameter of from 100 mm to 200 mm.

In Figure 6A and 6B the cast-in collar adaptor 90 has a plate 92 with a central aperture 93 with a skirt 94 extending down from the plate 92. The skirt 94 extends through the aperture 93 and small flanges 96 folded at the top are spot welded to the plate by spot welds 98.

In a preferred embodiment the plate 92 and skirt 94 are constructed from galvanized steel of 1 mm thickness. The plate can have dimensions of width of 25 cm to 45 cm and a length of from 40 cm to cm. The skirt can have a length of from 50 mm to 120 mm. The square aperture can have sides of from 100 mm to 200 mm.

Figure 7 shows the embodiment of Figure 5A and 5B with markings on the skirt for different forms of formwork. The cast-in collar adaptor 80 has a skirt 84 which extends the maximum distance expected below the plate 82. Markings 89 are provided around the skirt 84 for the expected shorter rib heights.

For instance the following heights may be expected: Lysaght W-Dek 78 mm Lysaght Bondek 54 mm 00 Lysaght Powerdek 100 100 mm Lysaght Powerdek 120 mm Fielders King Floor KF 70 70 mm O 5 Fielders King Floor RF 55 55 mm Fielders King Floor KF 57 57 mm Hence in this embodiment the skirt would extend 120 mm below the plate with markings for 100 mm, 78 Smm, 70 mm, 57 mm and 55 mm (to allow for the 55 and 54 mm ribs).

0 The length of a plate may not be so critical provided it is sufficiently long to span adjacent ribs when the c cast-in collar adaptor is being mounted with the skirt between ribs and is sufficiently long to span three Sribs when the cast-in collar adaptor is being mounted with the skirt cutting a rib.

Claims

1. A cast-in fire collar adaptor for formwork decking, the formwork decking being of a type having 5 ribs extending longitudinally and extending a first distance above a deck level, the ribs being transversely O Z spaced apart by a second distance, the cast-in collar adaptor comprising a plate portion, the plate portion having a width and a length, the length being sufficient to span at least three ribs of the decking in use, an aperture in the plate portion to receive a fire collar therethrough, and a skirt extending around and away from the periphery of the aperture, the skirt extending the first distance away from the plate portion. O

2. A cast-in fire collar adaptor for formwork decking as in Claim 1 wherein the wherein the plate comprises a width of from 25 cm to 45 cm and length of from 40 cm to 60 cm and the skirt has length of 00 from 50 to 120 mm.

3. A cast-in fire collar adaptor as in Claim 1 wherein the aperture is circular having a diameter of from 100 mm to 200 m.

4. A cast-in fire collar adaptor as in Claim 1 wherein the aperture is square or rectangular and having sides of from 100 mm to 200 m. A cast-in fire collar fire adaptor as in Claim I wherein the skirt has markings for different lengths to be cut off on-site.