WO2024011296A1 - Device for concrete formwork - Google Patents

Device for concrete formwork Download PDF

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Publication number
WO2024011296A1
WO2024011296A1 PCT/AU2023/050657 AU2023050657W WO2024011296A1 WO 2024011296 A1 WO2024011296 A1 WO 2024011296A1 AU 2023050657 W AU2023050657 W AU 2023050657W WO 2024011296 A1 WO2024011296 A1 WO 2024011296A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
channel
elongated
formwork
base
Prior art date
Application number
PCT/AU2023/050657
Other languages
French (fr)
Inventor
David Heszberger
Original Assignee
I. Industriespty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2022901991A external-priority patent/AU2022901991A0/en
Application filed by I. Industriespty Ltd filed Critical I. Industriespty Ltd
Publication of WO2024011296A1 publication Critical patent/WO2024011296A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
    • E04G13/066—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for overhangs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
    • E04G13/068—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for window or door sills
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/004—Strips for creating a chamfered edge
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys

Definitions

  • the present invention relates to concrete formwork.
  • the present invention relates to a device for use in forming concrete for use in building construction.
  • Drip channels can be, and are, added to existing buildings by roughly chiselling a channel in the lower overhanging surface.
  • the drip channel can be provided in the concrete as the concrete slab is formed.
  • FIG. 1 An example of a typical method for creating a drip channel is illustrated in Figure 1.
  • the structural panel is formed by pouring wet concrete into a formwork and allowing the concrete to set.
  • the formwork is typically formed of a flat lower surface, such as a wooden board.
  • a fillet is placed on the lower surface to form the drip channel.
  • the fillet (as shown) can be an elongated wooden strip having a triangular wedge-shaped profile.
  • a vertical wooden board defines the edge of the concrete panel. This vertical board is supported by placing a timber support against it.
  • a second fillet can be provided to form a bevel corner in the concrete slab.
  • this arrangement can prove flawed for a number of reasons. For example, the fillet can often move during the pour of the concrete, thereby not forming an ideal drip channel as the concrete sets. Similarly, the vertical board is known to slip and not provide an even vertical surface, thereby not providing an ideal edge to the concrete as it sets.
  • the present invention seeks to provide a device for use in concrete formwork which may ameliorate the foregoing shortcomings and disadvantages or which will at least provide a useful alternative.
  • a device for use in concrete formwork having an elongated and substantially planar base; along or near a first elongated side of the base is provided a protruding formation extending from the base; along a second elongated side of the base is arranged a channel formation adapted to receive and support a board; wherein, when concrete is poured onto the device the protruding formation forms a drip channel offset from the first elongated side.
  • the device of the invention has an angled surface located outside the channel formation for forming a bevel corner in the concrete slab to be formed.
  • the channel formation itself may have gripping features adapted to grip and secure a received board.
  • the gripping features may comprise elongated teeth formations, preferably formed on the inside of the channel walls.
  • the channel walls may be parallel to each other.
  • one or both the channel walls may be inclined towards the channel, to enhance gripping of the board when inserted into the channel.
  • the protruding formation along or near the first elongated side of the device preferably has a triangular profile.
  • the triangular profile is that of an isosceles triangle with a base longer than the other two sides.
  • the base may measure about 25 mm and each of the other two sides may measure about 18 mm.
  • the device of the invention may be made of any suitable material. It is preferably made of suitable plastic material, such a polyvinyl chloride (PVC). In this embodiment, the device may be made by extrusion moulding or other suitable method.
  • PVC polyvinyl chloride
  • the invention also provides a method of forming a concrete slab having a drip channel, comprising the steps of:
  • Figure 1 shows an elevation of a prior art arrangement for forming a concrete slab with a drip channel, according to the prior art
  • Figure 2 shows a perspective view from one side of a device according to a preferred embodiment of the present invention
  • Figure 3 shows a perspective view from the front of the device of Figure 2.
  • Figure 4 shows details of the channel formation of the device of Figures 2 and 3.
  • Figure 1 shows a prior art arrangement of formwork for a concrete slab having a drip channel.
  • first fillet 10 is an elongated timber strip which is nailed or otherwise attached to a flat lower surface, being wooden board 12.
  • the purpose of fillet 10 is to form a drip channel in concrete slab 16.
  • Second fillet 22 can be provided to form a bevel corner in the concrete slab 16.
  • FIG. 1 A preferred embodiment of a device for making concrete formwork is shown in Figure 2.
  • the device 24 has an elongated planar base 26. Adjacent one elongated side 28 of the device 24 is a protruding formation 30. This protruding formation 30 forms the drip channel in the concrete formwork when concrete is poured onto device 24 and allowed to set.
  • Protruding formation 30 is shown as having a triangular wedge-shaped profile which would form a V-shaped drip channel in the concrete slab when set. It will be appreciated that alternative profile shapes could be employed depending upon the required nature and shape of the drip channel required.
  • the channel formation 32 Arranged adjacent the other elongated side of the device is an integral channel formation 32.
  • the channel formation 32 in use, receives and supports a board or other flat material (not shown) to define an edge for the concrete formwork.
  • channel formation 32 is defined by a first substantially vertical wall 34 extending from and along side 36 of the device 24 and a second wall 38 extending substantially vertically and running approximately parallel with first wall 34.
  • second wall 38 is preferably provided with an angled outside surface 40, which forms a bevel corner for the concrete slab when formed and set.
  • channel formation 32 is provided with gripping features, shown in the form of elongated teeth 42 on each of walls 34 and 38, to assist in gripping and retaining a received board (not shown). It will be appreciated that alternative forms of gripping features could be employed.
  • Figure 3 shows examples of dimensions.
  • First wall 34 is about 27 mm high, while second wall 38 is substantially shorter.
  • Floor 44 of channel formation 32 is about 17 mm wide.
  • the base of angled outside surface 40 is about 18 mm. and is spaced from protruding formation 30 by about 57 mm.
  • Protruding formation 30 is about 25 mm at its base while each side is about 18 mm.
  • first wall 34 is not exactly parallel to second wall 38 but is inclined at an angle of about 88 degrees towards second wall 38. This helps elongated teeth 42 to more firmly grip the received board (not shown). Note that only some of teeth 42 are labelled in Figures 3 and 4.
  • the height of second wall 38 is about 18 mm in Figure 4.
  • Planar base 26 is about 2 mm in height.
  • the device 24 is designed to be an integrally formed unit. It will be appreciated that a variety of suitable materials can be employed for manufacturing the device. Preferred embodiments employ plastic materials, such as PVC, formed using suitable techniques, such as extrusion moulding.
  • the device is preferably formed in lengths of approximately 3m. For longer lengths of formwork, more than one device can be laid end-to-end.
  • the preferred materials of the device would allow it to be cut to required length. In exemplary embodiments, fracture formations could be provided at selected lengths of the device to facilitate ease of cutting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

A device for use in concrete formwork of a slab having a drip channel is described. The device has an elongated and substantially planar base. Along or near a first elongated side of the base is a protruding formation extending from the base. Along a second elongated side of the base is arranged a channel formation adapted to receive and support a board. When concrete is poured onto the device the protruding formation forms a drip channel offset from the first elongated edge.

Description

DEVICE FOR CONCRETE FORMWORK
Technical Field
The present invention relates to concrete formwork. In particular, the present invention relates to a device for use in forming concrete for use in building construction.
Figure imgf000003_0001
of the Invention
The following references to and descriptions of prior proposals or products are not intended to be, and are not to be construed as, statements or admissions of common general knowledge in the art. In particular, the following prior art discussion does not relate to what is commonly or well known by the person skilled in the art but assists in the understanding of the inventive step of the present invention of which the identification of pertinent prior art proposals is but one part.
The use of concrete in building construction is widely employed. It is common building practice to provide concrete slabs which provide structural overhanging portions or sills, which extend beyond the side surface of the building and overhang windows or glazing panels or which provide sills. For such overhanging portions or sills, it is good building practice to provide a drip channel or groove on the lower surface of the slab. The drip channel acts to obstruct water running along and adhering to the concrete’s surface from reaching the window or glazing and causes the water to fall under gravity, in other words, drip.
Drip channels can be, and are, added to existing buildings by roughly chiselling a channel in the lower overhanging surface. Ideally, the drip channel can be provided in the concrete as the concrete slab is formed.
An example of a typical method for creating a drip channel is illustrated in Figure 1. The structural panel is formed by pouring wet concrete into a formwork and allowing the concrete to set. The formwork is typically formed of a flat lower surface, such as a wooden board. A fillet is placed on the lower surface to form the drip channel. The fillet (as shown) can be an elongated wooden strip having a triangular wedge-shaped profile. A vertical wooden board defines the edge of the concrete panel. This vertical board is supported by placing a timber support against it. A second fillet can be provided to form a bevel corner in the concrete slab. In practice, this arrangement can prove flawed for a number of reasons. For example, the fillet can often move during the pour of the concrete, thereby not forming an ideal drip channel as the concrete sets. Similarly, the vertical board is known to slip and not provide an even vertical surface, thereby not providing an ideal edge to the concrete as it sets.
The present invention seeks to provide a device for use in concrete formwork which may ameliorate the foregoing shortcomings and disadvantages or which will at least provide a useful alternative.
Summary of the Invention
According to one aspect of the invention, there is provided a device for use in concrete formwork, the device having an elongated and substantially planar base; along or near a first elongated side of the base is provided a protruding formation extending from the base; along a second elongated side of the base is arranged a channel formation adapted to receive and support a board; wherein, when concrete is poured onto the device the protruding formation forms a drip channel offset from the first elongated side.
It is preferred that the device of the invention has an angled surface located outside the channel formation for forming a bevel corner in the concrete slab to be formed. The channel formation itself may have gripping features adapted to grip and secure a received board. In this embodiment, the gripping features may comprise elongated teeth formations, preferably formed on the inside of the channel walls. The channel walls may be parallel to each other. In another embodiment, one or both the channel walls may be inclined towards the channel, to enhance gripping of the board when inserted into the channel. The protruding formation along or near the first elongated side of the device preferably has a triangular profile. For this embodiment, it is preferred that the triangular profile is that of an isosceles triangle with a base longer than the other two sides. As an example, the base may measure about 25 mm and each of the other two sides may measure about 18 mm.
The device of the invention may be made of any suitable material. It is preferably made of suitable plastic material, such a polyvinyl chloride (PVC). In this embodiment, the device may be made by extrusion moulding or other suitable method.
The invention also provides a method of forming a concrete slab having a drip channel, comprising the steps of:
- using the device of the invention in formwork for the slab;
- inserting a board in the channel formation of the device;
- pouring concrete into the formwork;
- allowing the concrete to set; and removing the formwork.
Brief Description of the Drawings
The invention may be better understood from the following non-limiting description of a preferred embodiment, in which:
Figure 1 shows an elevation of a prior art arrangement for forming a concrete slab with a drip channel, according to the prior art;
Figure 2 shows a perspective view from one side of a device according to a preferred embodiment of the present invention;
Figure 3 shows a perspective view from the front of the device of Figure 2; and
Figure 4 shows details of the channel formation of the device of Figures 2 and 3.
Detailed
Figure imgf000006_0001
of the
Figure imgf000006_0002
Figure 1 shows a prior art arrangement of formwork for a concrete slab having a drip channel. In this arrangement, first fillet 10 is an elongated timber strip which is nailed or otherwise attached to a flat lower surface, being wooden board 12. The purpose of fillet 10 is to form a drip channel in concrete slab 16.
Vertical wooden board 18 defines the edge of the concrete slab 16 and is supported by placing timber support 20 against it. Second fillet 22 can be provided to form a bevel corner in the concrete slab 16.
Once concrete slab 16 has set, timber support 20, wooden board 12 and fillets 10 and 22 are removed.
Setting up the formwork for the prior art arrangement is time consuming, requiring accurate and stable placement of fillets 10 and 22, proper retention of vertical board 18 in position and stability of timber support 20. If any of these is unstable or inadequately retained in position, the resulting slab 16 may suffer from an inadequately formed drip channel, an uneven vertical edge which can chip or crack, and a badly formed bevel.
A preferred embodiment of a device for making concrete formwork is shown in Figure 2.
The device 24 has an elongated planar base 26. Adjacent one elongated side 28 of the device 24 is a protruding formation 30. This protruding formation 30 forms the drip channel in the concrete formwork when concrete is poured onto device 24 and allowed to set.
Protruding formation 30 is shown as having a triangular wedge-shaped profile which would form a V-shaped drip channel in the concrete slab when set. It will be appreciated that alternative profile shapes could be employed depending upon the required nature and shape of the drip channel required.
Arranged adjacent the other elongated side of the device is an integral channel formation 32. The channel formation 32, in use, receives and supports a board or other flat material (not shown) to define an edge for the concrete formwork.
As shown, channel formation 32 is defined by a first substantially vertical wall 34 extending from and along side 36 of the device 24 and a second wall 38 extending substantially vertically and running approximately parallel with first wall 34. As shown, second wall 38 is preferably provided with an angled outside surface 40, which forms a bevel corner for the concrete slab when formed and set.
Referring to Figures 2 and 3, channel formation 32 is provided with gripping features, shown in the form of elongated teeth 42 on each of walls 34 and 38, to assist in gripping and retaining a received board (not shown). It will be appreciated that alternative forms of gripping features could be employed.
In this embodiment, Figure 3 shows examples of dimensions. First wall 34 is about 27 mm high, while second wall 38 is substantially shorter. Floor 44 of channel formation 32 is about 17 mm wide. The base of angled outside surface 40 is about 18 mm. and is spaced from protruding formation 30 by about 57 mm. Protruding formation 30 is about 25 mm at its base while each side is about 18 mm.
The detail of channel formation 32 shown in Figure 4 shows that first wall 34 is not exactly parallel to second wall 38 but is inclined at an angle of about 88 degrees towards second wall 38. This helps elongated teeth 42 to more firmly grip the received board (not shown). Note that only some of teeth 42 are labelled in Figures 3 and 4.
The height of second wall 38 is about 18 mm in Figure 4. Planar base 26 is about 2 mm in height.
The device 24 is designed to be an integrally formed unit. It will be appreciated that a variety of suitable materials can be employed for manufacturing the device. Preferred embodiments employ plastic materials, such as PVC, formed using suitable techniques, such as extrusion moulding.
The device is preferably formed in lengths of approximately 3m. For longer lengths of formwork, more than one device can be laid end-to-end. The preferred materials of the device would allow it to be cut to required length. In exemplary embodiments, fracture formations could be provided at selected lengths of the device to facilitate ease of cutting.
The term “comprise” and variants of that term such as “comprises” or “comprising” are used herein to denote the inclusion of a stated integer or integers but not to exclude any other integer or integers, unless in the context or usage an exclusive interpretation of the term is required.
Those skilled in the art will appreciate that the invention described herein is susceptible to variations and modifications other than those specifically described. All such variations and modifications are to be considered within the scope and spirit of the present invention the nature of which is to be determined from the foregoing description. An example is the elongated planar base, which may extend beyond the protruding formation designed to form the drip channel in the concrete slab.
Industrial Applicability
It will be apparent to a person skilled in the art that embodiments of the device of the invention can overcome the flaws in the prior art arrangement of Figure 1 while providing a far more time-efficient way of forming a concrete slab with a well-defined drip channel and bevel and an even vertical edge.

Claims

Claims
1 . A device for use in concrete formwork, the device having an elongated and substantially planar base; along or near a first elongated side of the base is provided a protruding formation extending from the base; along the second elongated side of the base is arranged a channel formation adapted to receive and support a board; wherein, when concrete is poured onto the device the protruding formation forms a drip channel offset from the first elongated edge.
2. The device of claim 1 , wherein said channel formation is provided with an angled surface for forming a bevel corner.
3. The device of claim 1 or 2, wherein, said channel formation is provided with gripping features adapted to grip and secure a received board.
4. The device of claim 3, wherein said gripping features are elongated teeth formations.
5. The device of any one of claims 1 to 4, wherein said protruding formation has a triangular profile.
6. The device of any one of claims 1 to 5, wherein the channel formation has:
- a first substantially vertical wall extending from and along the second side of the device; and
- a second wall extending substantially vertically and running approximately parallel with the first wall.
7. The device of any one of claims 1 to 5, wherein the channel formation has:
- a first substantially vertical wall extending from and along the second side of the device; and
- a second wall being at an angle of incline of about 88 degrees to the first wall. The device of any one of claims 1 to 7, wherein the device is made of PVC. A method of forming a concrete slab having a drip channel, comprising the steps of: - using the device of any one of claims 1 to 8 in formwork for the slab;
- inserting a board in the channel formation of the device;
- pouring concrete into the formwork;
- allowing the concrete to set; and removing the formwork.
PCT/AU2023/050657 2022-07-15 2023-07-17 Device for concrete formwork WO2024011296A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2022901991A AU2022901991A0 (en) 2022-07-15 Device for Concrete Formwork
AU2022901991 2022-07-15

Publications (1)

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WO2024011296A1 true WO2024011296A1 (en) 2024-01-18

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418858A1 (en) * 1978-03-03 1979-09-28 Dossello Pierre Synthetic resin mould for concrete window sill - locates embedded shutter fittings and has detachable front panel with edges defined by rupture line
JPS59177645U (en) * 1983-05-13 1984-11-28 アルプス商事株式会社 Template
DE8603355U1 (en) * 1986-02-08 1986-05-28 Tiletschke, Lothar, 4904 Enger Formwork frame for a wall or ceiling opening
KR20010059643A (en) * 1999-12-30 2001-07-06 김진황 A Device for Forming a Throating on a Concrete to Cantilever Structure
KR20070049547A (en) * 2006-09-29 2007-05-11 임정순 Construction mold panel for chamfer
JP2009144387A (en) * 2007-12-13 2009-07-02 Shinichi Sadohara Attachment for concrete form
US20090179137A1 (en) * 2007-02-15 2009-07-16 Abzac Canada Inc. Retaining device for assembling two panels, recyclable formwork for forming a concrete structure and packaging assembly using the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418858A1 (en) * 1978-03-03 1979-09-28 Dossello Pierre Synthetic resin mould for concrete window sill - locates embedded shutter fittings and has detachable front panel with edges defined by rupture line
JPS59177645U (en) * 1983-05-13 1984-11-28 アルプス商事株式会社 Template
DE8603355U1 (en) * 1986-02-08 1986-05-28 Tiletschke, Lothar, 4904 Enger Formwork frame for a wall or ceiling opening
KR20010059643A (en) * 1999-12-30 2001-07-06 김진황 A Device for Forming a Throating on a Concrete to Cantilever Structure
KR20070049547A (en) * 2006-09-29 2007-05-11 임정순 Construction mold panel for chamfer
US20090179137A1 (en) * 2007-02-15 2009-07-16 Abzac Canada Inc. Retaining device for assembling two panels, recyclable formwork for forming a concrete structure and packaging assembly using the same
JP2009144387A (en) * 2007-12-13 2009-07-02 Shinichi Sadohara Attachment for concrete form

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