WO2009067723A2 - A building mould - Google Patents

A building mould Download PDF

Info

Publication number
WO2009067723A2
WO2009067723A2 PCT/ZA2008/000111 ZA2008000111W WO2009067723A2 WO 2009067723 A2 WO2009067723 A2 WO 2009067723A2 ZA 2008000111 W ZA2008000111 W ZA 2008000111W WO 2009067723 A2 WO2009067723 A2 WO 2009067723A2
Authority
WO
WIPO (PCT)
Prior art keywords
mould
protruding portions
base
building
anyone
Prior art date
Application number
PCT/ZA2008/000111
Other languages
French (fr)
Other versions
WO2009067723A3 (en
Inventor
Rael Marc Smith
Original Assignee
Rael Marc Smith
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
Application filed by Rael Marc Smith filed Critical Rael Marc Smith
Publication of WO2009067723A2 publication Critical patent/WO2009067723A2/en
Publication of WO2009067723A3 publication Critical patent/WO2009067723A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/164—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes for plates, panels, or similar sheet- or disc-shaped articles
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/40—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings for coffered or ribbed ceilings
    • E04G11/46—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings for coffered or ribbed ceilings of hat-like or trough-like shape encasing a rib or the section between two ribs or encasing one rib and its adjacent flat floor or ceiling section

Definitions

  • This invention relates to moulds used primarily, though not exclusively, for the construction of concrete slabs
  • the coffer shutter has a single protruding trough portion. Use of the shutter is viable when slab depth is greater than 350mm. Use of this shutter is therefore common when using heavy loads or using slabs with long spans, and where slab depth is not a critical factor. Due to the cavities created from such shutters, many vertical reinforcement rods are required to increase the slabs shear capacity. To this extent flat slabs, which do not have cavities, do not require such extensive shear reinforcing, but rather local shear reinforcing in specially calculated zones near the column.
  • moulds minimizes the amount of concrete used when constructing a slab. This results in the reduction of slab weight (dead load), which in turn reduces the amount of transverse reinforcing steel required to carry the slab. An additional benefit is the potential reduction of column and foundation size.
  • the present invention seeks to provide a shutter for use in slab construction, where slab depth is substantially less than 350mm, and the slab would otherwise have been a conventional flat slab.
  • a building mould comprising a base having a plurality of protruding portions.
  • the protruding portions allow a building substrate, such as concrete to poured in between and on top of the protruding portions, in use thereby obviating the need for shear reinforcing, alternatively reducing the amount of shear reinforcing needed, when compared to a single protrusion coffer mould, in use.
  • each protruding portion has a cavity, which defines a recess in the base.
  • the base has at least one raised portion situated between the protruding portions.
  • the base has at least two raised portions on opposing sides of the mould. In use, these raised portions act as spacer blocks for resting reinforcing rods thereon.
  • each protruding portion tapers from the base to its free end.
  • the protruding portion may be anyone of a semi-spherical, rectangular or generally square in shape
  • the external height of the protruding portions from the base is between 125mm and 325mm.
  • the mould may be made from fiberglass, aluminum, plastics or other suitably stiff and sturdy materials.
  • a concrete flat slab with a plurality of recesses extending from its underside.
  • a method of constructing a concrete slab having a plurality of recesses on its underside comprising the steps of:
  • the method comprises the step of placing reinforcement bars along the base in between the protruding portions before pouring the concrete.
  • Figure 1 shows a perspective top view of a shutter
  • Figure 2 shows a perspective side view of the shutter in Figure 1 ;
  • Figure 3 shows a side section of the shutter in Figure 1 along the line 3-3, on a scaffold;
  • Figure 4 shows an underside view of a second embodiment of the shutter;
  • Figure 5 shows a perspective top view of the shutter in Figure 4;
  • Figure 6 shows a perspective underside view of the shutter in Figure 4.
  • Figures 1 to 3 show a building mould or "shutter” 10 having a base 12 and four protruding portions 14.
  • the protruding portions each have a cavity 16, which defines a plurality of recesses in the base. These recesses are visible from the underside 18 of the base.
  • Figure 3 shows the shutter secured on top of a scaffold 20.
  • steel rods 22 are placed on the topside 24 of the base, between the protruding portions. These rods provide structural integrity and provide the moment resistance of the slab. Concrete is then poured on to the mould until the specified slab depth is reached. Once the concrete has set, the mould is removed. The resulting cavities are viewable from the slab's underside (not shown).
  • Figures 1 to 3 show a shutter having the following dimensions of the protruding portions: length 250mm, width 250mm and height 125mm and 325mm spaced apart from each other. Such a shutter would be used when producing a concrete slab having a slab depth of between 250 to 375mm.
  • Figures 4 to 6 show another shutter embodiment comprising nine protruding portions.
  • the shutter has a network of ribs 26 on the underside both on the base and extending downwards along the cavities.
  • the ribs provide the shutter with structural rigidity.
  • Shutters may vary as to the number and dimensions of the protruding portions. Use of a specifically dimensioned shutter will depend on the slab construction requirements.
  • the shutter is made from fiberglass, but may be made from other suitable light-weight and sturdy materials such as aluminum and plasties.
  • the shutter of the invention is suitably configured and dimensioned to construct a flat slab, using only the shutter and a scaffold mat. The need for vertical shear reinforcing steel rods is thereby eliminated resulting in cost savings.
  • the protruding portions of the shutter may be shaped to provide slabs of varying cavity shapes, including square, rectangular, oval and spherical shaped cavities.

Abstract

A building mould (10) comprising a base (12) having a plurality of protruding portions (14). The protruding portions are configured to enable a building substrate, such as concrete to poured in between and on top of the protruding portions, in use. This obviates the need for shear reinforcing, alternatively reduces the amount of shear reinforcing needed, when compared to a single protrusion coffer mould.

Description

A BUILDING MOULD B28B, E04B, E04G
TECHNICAL FIELD
This invention relates to moulds used primarily, though not exclusively, for the construction of concrete slabs
BACKGROUND ART
Building moulds or shutters as they are known in the art are used to form concrete slabs with a cavity. By adding a protrusion on to the shutter, a cavity can be formed in the soffit of the slab, which extends from the base of the slab. Existing shutter systems use a coffer shutter. The cavity formed from such shutter is known as a coffer slab in the art.
The coffer shutter has a single protruding trough portion. Use of the shutter is viable when slab depth is greater than 350mm. Use of this shutter is therefore common when using heavy loads or using slabs with long spans, and where slab depth is not a critical factor. Due to the cavities created from such shutters, many vertical reinforcement rods are required to increase the slabs shear capacity. To this extent flat slabs, which do not have cavities, do not require such extensive shear reinforcing, but rather local shear reinforcing in specially calculated zones near the column.
Use of moulds minimizes the amount of concrete used when constructing a slab. This results in the reduction of slab weight (dead load), which in turn reduces the amount of transverse reinforcing steel required to carry the slab. An additional benefit is the potential reduction of column and foundation size.
Use of single protrusion moulds for slab depths less than 350mm would not be viable. This is due to a decreased accuracy of mould configuration, additional labor costs and construction time associated with securing a greater number of moulds when compared to a mould of the invention.
The present invention seeks to provide a shutter for use in slab construction, where slab depth is substantially less than 350mm, and the slab would otherwise have been a conventional flat slab.
DISCLOSURE OF INVENTION According to one aspect of the invention there is provided a building mould comprising a base having a plurality of protruding portions.
Preferably there are at least four protruding portions.
Preferably the protruding portions allow a building substrate, such as concrete to poured in between and on top of the protruding portions, in use thereby obviating the need for shear reinforcing, alternatively reducing the amount of shear reinforcing needed, when compared to a single protrusion coffer mould, in use.
Preferably each protruding portion has a cavity, which defines a recess in the base.
Conveniently the base has at least one raised portion situated between the protruding portions.
Conveniently the base has at least two raised portions on opposing sides of the mould. In use, these raised portions act as spacer blocks for resting reinforcing rods thereon. Preferably each protruding portion tapers from the base to its free end. Alternatively the protruding portion may be anyone of a semi-spherical, rectangular or generally square in shape
Preferably the external height of the protruding portions from the base is between 125mm and 325mm.
The mould may be made from fiberglass, aluminum, plastics or other suitably stiff and sturdy materials.
According to one aspect of the invention there is provided a concrete flat slab with a plurality of recesses extending from its underside.
According to a further aspect of the invention there is provided a method of constructing a concrete slab having a plurality of recesses on its underside comprising the steps of:
- placing a building mould on to a scaffold, the mould comprising a base and a plurality of protruding portions; - pouring concrete on to the mould to form the slab; and
- removing the mould once the concrete has set.
Preferably the method comprises the step of placing reinforcement bars along the base in between the protruding portions before pouring the concrete.
Further features, variants and/or advantages of the invention will emerge from the following non-limiting description of examples of the invention made with reference to the accompanying schematic drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a perspective top view of a shutter;
Figure 2 shows a perspective side view of the shutter in Figure 1 ; Figure 3 shows a side section of the shutter in Figure 1 along the line 3-3, on a scaffold; Figure 4 shows an underside view of a second embodiment of the shutter; Figure 5 shows a perspective top view of the shutter in Figure 4; and Figure 6 shows a perspective underside view of the shutter in Figure 4.
DESCRIPTION OF ILLUSTRATED EMBODIMENTS
Figures 1 to 3 show a building mould or "shutter" 10 having a base 12 and four protruding portions 14. The protruding portions each have a cavity 16, which defines a plurality of recesses in the base. These recesses are visible from the underside 18 of the base.
Figure 3 shows the shutter secured on top of a scaffold 20. In use, steel rods 22 are placed on the topside 24 of the base, between the protruding portions. These rods provide structural integrity and provide the moment resistance of the slab. Concrete is then poured on to the mould until the specified slab depth is reached. Once the concrete has set, the mould is removed. The resulting cavities are viewable from the slab's underside (not shown).
Figures 1 to 3 show a shutter having the following dimensions of the protruding portions: length 250mm, width 250mm and height 125mm and 325mm spaced apart from each other. Such a shutter would be used when producing a concrete slab having a slab depth of between 250 to 375mm.
Figures 4 to 6 show another shutter embodiment comprising nine protruding portions. The shutter has a network of ribs 26 on the underside both on the base and extending downwards along the cavities. The ribs provide the shutter with structural rigidity.
Shutters may vary as to the number and dimensions of the protruding portions. Use of a specifically dimensioned shutter will depend on the slab construction requirements. The shutter is made from fiberglass, but may be made from other suitable light-weight and sturdy materials such as aluminum and plasties. The shutter of the invention is suitably configured and dimensioned to construct a flat slab, using only the shutter and a scaffold mat. The need for vertical shear reinforcing steel rods is thereby eliminated resulting in cost savings.
It will be appreciated that the slab cavities have aesthetic value in addition to their functional and economic benefits. The protruding portions of the shutter may be shaped to provide slabs of varying cavity shapes, including square, rectangular, oval and spherical shaped cavities.
The invention is not limited to the precise details described above and shown in the drawings. Modifications may be made and other embodiments developed without departing from the spirit of the invention. In particular, there may be raised portions extending between the protrusions, on opposing sides of the mould. Such raised portions act as a spacer block for resting reinforcing rods thereon. The summary of invention and claims form an integral aspect of the description of the invention.

Claims

CLAIMS:
1. A building mould comprising a base having a plurality of protruding portions.
2. A building mould as claimed in claim 1 comprising at least four protruding portions.
3. A building mould as claimed in claims 1 and 2, wherein the protruding portions are configured to enable a building substrate to poured in between and on top of the protruding portions, in use.
4. A building mould as claimed in anyone of claims 1 to 3, wherein each protruding portion has a cavity, which defines a recess in the base.
5. A building mould as claimed in anyone of claims 1 to 4, wherein the base comprises at least one raised portion situated between the protruding portions.
6. A building mould as claimed in anyone of claims 1 to 5, wherein each protruding portion is configured and dimensioned to form any one of the following shapes: a portion which tapers from the base to its free end, a semi-spherical shape, a rectangular shape or a generally square shape.
7. A building mould as claimed in anyone of claims 1 to 6, wherein the external height of the protruding portions from the base is between 125mm and 325mm.
8. A building mould as claimed in anyone of claims 1 to 7, wherein the mould is formed from anyone of fiberglass, aluminum, plastics or other suitably stiff and sturdy materials.
9. A method of constructing a concrete slab having a plurality of recesses on its underside comprising the steps of:
- placing a building mould on to a scaffold, the mould comprising a base and a plurality of protruding portions;
- pouring concrete on to the mould to form the slab; and
- removing the mould once the concrete has set.
10. A method of constructing a concrete slab as claimed in claim 9, comprising the step of placing reinforcement bars along the base in between the protruding portions before pouring the concrete.
Dated this 19th day of November 2008
KANTOR MYERS & PASLOVSKY APPLICANT'S PATENT ATTORNEYS
PCT/ZA2008/000111 2007-11-20 2008-11-19 A building mould WO2009067723A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2007/10021 2007-11-20
ZA200710021 2007-11-20

Publications (2)

Publication Number Publication Date
WO2009067723A2 true WO2009067723A2 (en) 2009-05-28
WO2009067723A3 WO2009067723A3 (en) 2009-08-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2008/000111 WO2009067723A2 (en) 2007-11-20 2008-11-19 A building mould

Country Status (1)

Country Link
WO (1) WO2009067723A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210268689A1 (en) * 2020-03-02 2021-09-02 David Van Doren Reusable universal waffle-cavity molding form
US20210317670A1 (en) * 2020-04-14 2021-10-14 Voidform Products, Inc. Modular Void Form Structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520967A (en) * 1966-10-31 1970-07-21 George J Kreier Jr Method for making thin concrete panels
GB1540244A (en) * 1975-07-11 1979-02-07 Tsuzuki J Mould for use in the manufacture of concrete segments
EP1236843A2 (en) * 2000-12-13 2002-09-04 Studio Tecnico Ing. Giorgio Cristalli System, method and modular forms for the production of floors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520967A (en) * 1966-10-31 1970-07-21 George J Kreier Jr Method for making thin concrete panels
GB1540244A (en) * 1975-07-11 1979-02-07 Tsuzuki J Mould for use in the manufacture of concrete segments
EP1236843A2 (en) * 2000-12-13 2002-09-04 Studio Tecnico Ing. Giorgio Cristalli System, method and modular forms for the production of floors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210268689A1 (en) * 2020-03-02 2021-09-02 David Van Doren Reusable universal waffle-cavity molding form
US11964408B2 (en) * 2020-03-02 2024-04-23 David Van Doren Reusable universal waffle-cavity molding form
US20210317670A1 (en) * 2020-04-14 2021-10-14 Voidform Products, Inc. Modular Void Form Structure

Also Published As

Publication number Publication date
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