CA2299193A1 - Formwork for creating columns and curved walls - Google Patents
Formwork for creating columns and curved walls Download PDFInfo
- Publication number
- CA2299193A1 CA2299193A1 CA 2299193 CA2299193A CA2299193A1 CA 2299193 A1 CA2299193 A1 CA 2299193A1 CA 2299193 CA2299193 CA 2299193 CA 2299193 A CA2299193 A CA 2299193A CA 2299193 A1 CA2299193 A1 CA 2299193A1
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- Canada
- Prior art keywords
- connector
- curved wall
- elements
- formwork
- longitudinal edge
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/84—Walls made by casting, pouring, or tamping in situ
- E04B2/86—Walls made by casting, pouring, or tamping in situ made in permanent forms
- E04B2/8635—Walls made by casting, pouring, or tamping in situ made in permanent forms with ties attached to the inner faces of the forms
- E04B2/8641—Walls made by casting, pouring, or tamping in situ made in permanent forms with ties attached to the inner faces of the forms using dovetail-type connections
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/84—Walls made by casting, pouring, or tamping in situ
- E04B2/86—Walls made by casting, pouring, or tamping in situ made in permanent forms
- E04B2002/867—Corner details
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
A formwork system for casting curved concrete walls comprises a curved wall element having a curved wall portion and connectors at each longitudinal edge of the curved wall portion. Resistance to bending in the vertical plane of the formwork is provided by connector elements extending radially inward from the curved wall elements. The connector elements also act to retain together edge adjacent curved wall elements.
Description
TITLE
FORMWORK FOR CREATING COLUMNS AND CURVED WALLS
s FIELD OF THE INVENTION
This invention relates to modular formwork for forming concrete columns and curved concrete structures.
to BACKGROUND OF THE INVENTION
It is known to provide formwork for pouring concrete columns comprising semi-circular sections of steel pipe which are joined to form a tube and into which concrete is poured. Once the concrete has set, the steel pipe sections are removed.
is It is also known to provide modular PVC formwork for the purpose of creating straight and flat concrete walls, and in which the formwork stays in place after the concrete has set. Canadian Patent No. 2,215,939 discloses such formwork which comprises flat elongated wall elements connected to one another by engaging means 2o along their respective edges, and connecting members extending across the width of the formwork to retain opposed wall surfaces in spaced relationship. The result is modular stay in place formwork for creating straight walls.
However, there remains a need to provide modular stay in place formwork that 2s is capable of producing concrete columns and curved walls and which avoids the difficulty of dealing with bulky semi-circular sections of steel pipe.
FORMWORK FOR CREATING COLUMNS AND CURVED WALLS
s FIELD OF THE INVENTION
This invention relates to modular formwork for forming concrete columns and curved concrete structures.
to BACKGROUND OF THE INVENTION
It is known to provide formwork for pouring concrete columns comprising semi-circular sections of steel pipe which are joined to form a tube and into which concrete is poured. Once the concrete has set, the steel pipe sections are removed.
is It is also known to provide modular PVC formwork for the purpose of creating straight and flat concrete walls, and in which the formwork stays in place after the concrete has set. Canadian Patent No. 2,215,939 discloses such formwork which comprises flat elongated wall elements connected to one another by engaging means 2o along their respective edges, and connecting members extending across the width of the formwork to retain opposed wall surfaces in spaced relationship. The result is modular stay in place formwork for creating straight walls.
However, there remains a need to provide modular stay in place formwork that 2s is capable of producing concrete columns and curved walls and which avoids the difficulty of dealing with bulky semi-circular sections of steel pipe.
It is accordingly an object of this invention to provide stay-in-place modular formwork elements for pouring concrete into columns or curved surfaces, and a method of assembling them. It is a further object of this invention to provide such elements which are capable of being used to connect to stay-in-place modular straight s wall formwork of the kind described in Canadian Patent No. 2,215,939.
As noted above, prior art modular PVC formwork elements for forming straight walls are known to provide cross members between opposing surfaces of the formwork for the purpose of providing rigidity against the outward pressure of io concrete. However, when forming a column or a curved wall, the provision of a cross member between opposing faces presents problems. For example, the use of such a cross member may impede the ability to install rebar. It is therefore an object of this invention to provide modular formwork for creating curved concrete walls or services which provides inherent structural rigidity to the formwork and which resists outward is bulging due to pressure from the concrete.
SU1~IMARY OF THE INVENTION
2o According to the invention there is provided a curved elongated modular wall element comprising a curved portion and connector means at each longitudinal edge of the curved portion. The arc angle defined by the outer surface preferably comprises an even fraction of 360°. A connector element according to the invention comprises an elongated, straight planar surface, one longitudinal edge of which 2s includes two opposed connecting means for engaging the connecting means of the wall elements.
As noted above, prior art modular PVC formwork elements for forming straight walls are known to provide cross members between opposing surfaces of the formwork for the purpose of providing rigidity against the outward pressure of io concrete. However, when forming a column or a curved wall, the provision of a cross member between opposing faces presents problems. For example, the use of such a cross member may impede the ability to install rebar. It is therefore an object of this invention to provide modular formwork for creating curved concrete walls or services which provides inherent structural rigidity to the formwork and which resists outward is bulging due to pressure from the concrete.
SU1~IMARY OF THE INVENTION
2o According to the invention there is provided a curved elongated modular wall element comprising a curved portion and connector means at each longitudinal edge of the curved portion. The arc angle defined by the outer surface preferably comprises an even fraction of 360°. A connector element according to the invention comprises an elongated, straight planar surface, one longitudinal edge of which 2s includes two opposed connecting means for engaging the connecting means of the wall elements.
In another aspect of the invention, a curved wall is formed by a plurality of individual elongated formwork elements connected end to end by means of a connector element extending radially inward from the point where two edge adjacent wall elements meet, one end of such connector being attached to the ends of s respective adjacent wall elements, and said connector having a planar surface extending in said radial direction.
In another aspect, the invention comprises a curved wall element as described above and further including inwardly extending projections spaced inwardly from ~o each opposed end of each element.
Bracing elements are described which comprise a planar central portion terminating at each longitudinal edge in angled connecting means extending at 45°
and 135° with respect to the plane of the central portion. The connecting means of the ~s bracing elements are adapted to engage the inwardly spaced projections of the wall elements.
Other aspects of the invention will be appreciated by reference to the detailed description of the embodiments of the invention and to the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred and alternative embodiments of the invention will be appreciated 2s by reference to the following description and to the drawings thereof in which:
In another aspect, the invention comprises a curved wall element as described above and further including inwardly extending projections spaced inwardly from ~o each opposed end of each element.
Bracing elements are described which comprise a planar central portion terminating at each longitudinal edge in angled connecting means extending at 45°
and 135° with respect to the plane of the central portion. The connecting means of the ~s bracing elements are adapted to engage the inwardly spaced projections of the wall elements.
Other aspects of the invention will be appreciated by reference to the detailed description of the embodiments of the invention and to the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred and alternative embodiments of the invention will be appreciated 2s by reference to the following description and to the drawings thereof in which:
Fig. 1 is a cross-sectional view of a segment of a column of formwork made using the formwork elements according to the invention;
Fig. 1 (a) is an enlarged view of a portion of Fig. 1 comprising two wall s elements according to the invention;
Fig. 2 is a cross-sectional view of a wall element according to the invention;
Fig. 3 is a cross-sectional view of a connector element according to the io invention;
Fig. 4 is a cross-sectional view of an alternative embodiment of the wall element of the invention;
~s Fig. 5 is a cross-sectional view of a segment of a column of formwork made from the wall elements of Fig. 4;
Fig. 5(a) is an enlarged view of a portion of Fig. 5 comprising a single wall element;
Fig. 6 is a cross-sectional view of a 45° element according to the invention;
Fig. 7 is an enlarged view of two 45° elements connected to a connector element and two curved wall elements;
2s Fig. 8 is a cross-sectional view of a section of curved formwork according to the invention joining two straight formwork sections; and, s Fig. 9 is a cross-sectional view of two connected curved wall elements, bracing elements and 45 degree elements according to an alternative embodiment.
s DETAILED DESCRIPTION OF THE PREFERRED AND
ALTERNATIVE EMBODIMENTS
A formwork structure forming a segment of a column according to the invention is shown in Fig. 1. All of the drawings show cross sectional views of the ~o elements. The elements are elongated through the plane of the drawings.
Referring to Fig. 1 and Fig. 1 (a), the formwork comprises a plurality of curved wall elements 10 connected in edge to edge relationship as at 11. Connector elements 12 extend radially from connection points 11 between adjacent elements 10.
~s Referring to Fig. 2, each curved wall element 10 comprises a curved surface 14, and a C-shaped termination 16 at each longitudinal edge 18, 20 of element 10. T-shaped key projections 36 are spaced inwardly from the longitudinal edges of element 10.
As best seen in Fig. 3, each connector element 12 comprises an elongated planar surface 22, and opposed T-shaped projections 24, 26 and 23, 25 extending outwardly from longitudinal edges 28, 30 respectively of the connector element 12.
L-shaped extensions 27, 29 serve to bracket projections 24, 26.
2s A column of formwork formed with the connector and wall elements according to the invention will provide rigidity against bending out of the vertical plane. The rigidity is provided by the curved wall elements themselves, but is thought to be significantly enhanced by the presence of radially disposed connector elements, which will tend to resist bending of the column along the plane of the connector elements. It will be appreciated that the more connectors are provided along the inside periphery s of the formwork, the greater the overall resistance to bending of the formwork will be.
The curved wall element 10 is preferably chosen to be an integral fraction of 360°. Thus, a real number of elements 10 may be used without truncation to complete a circle. In the preferred embodiment, the arc length of element 10 is chosen to be io 3.14 inches or centimeters or a multiple thereof.
Referring to Fig. 4, in an alternative embodiment of the invention, wall elements 34 comprise a plurality of wall segments 31, 33 and 35, each segment having the characteristics of element 10, but the segments are integrally formed as a is single element 34. A column of formwork made using elements 34 is illustrated in Fig. 5.
Referring to Figs. 1, 1(a), 5 and 5(a), the wall elements 10 and 34 preferably include key projections 36 extending inwardly from the inner surface of the wall 2o element and being spaced inwardly in relation to the longitudinal edges of the wall element. Key projections 36 enable the use of a 45° element 38, such use being illustrated in Fig 5.
As is best appreciated by reference to Fig. 6, 45° element 38 comprises a flat 2s planar surface 40. Each longitudinal edge terminates in a C-shaped portion 42, 44.
One of the C-shaped portions defines an angle of 45° to the planar surface 40 while the other defines an angle of 135° to the planar surface 40. As is best illustrated in Fig. 7, elements 38 may be disposed on key projections 36 so as to extend from the key projection 36 to the T-shaped projections 23, 25 of a connector element 12. The 45° elements 38 provide additional rigidity to resist outward pressure from the concrete.
s The curved wall elements 10 and the connector elements 12 may also be used to interpose a curved wall section between straight wall sections of formwork, as illustrated in Fig. 8. The curved wall elements 10 are adapted to integrate into straight formwork wall elements 50 and straight formwork connector elements 52 of the types o described in Canadian Patent No. 2,215,939, straight formwork elements 50 being provided with C-shaped portions 54 corresponding to the C-shaped terminations 16 of curved wall elements 10, and straight formwork elements 12 being provided with key projections 56 corresponding to key projections 36 of connector elements 12.
~s It may also be desirable to further enhance structural rigidity of a column of formwork by cross-bracing opposing walls. This may be accomplished by extending diametrically opposed connector elements inward so as to connect them together.
Appropriately wide connector elements may be made to extend inward from connection points between curved wall elements at diametrically opposed sides of the 2o column. The wide connector elements may be adapted to connect to one another end to end at the epicenter of the column.
It will be appreciated that the connection means between the wall elements 10 and the connector elements 12 have been illustrated in the preferred embodiment as 2s C-shaped portions on the curved wall elements 10 and cooperating opposed T-shaped portions on the connector elements 12 to form a tongue and groove type of connection. The arrangement can of course be substituted for T shaped portions at the end of the wall elements and C shaped portions on the connector elements, or indeed any other type of connection system, provided the connector elements act to secure edge to edge adjacent curved wall elements to one another.
s Similarly, the connection means between the 45° elements 38 and the key projections 36 have been illustrated in the preferred embodiment as C-shaped portions on the 45° elements and cooperating opposed T-shaped key projections on the connector elements (23, 25) and the curved wall elements (36) to form a tongue and groove type of connection. The arrangement can of course be reversed, or to indeed any other type of connection system, provided the 45°
elements act to brace the connector elements 12 to the curved wall elements 10.
In an alternative approach, the connector means between adjacent curved wall elements is as shown in Fig. 9. According to this approach, each curved wall element 70 includes a male connector 72 along one longitudinal edge and a female connector 74 along the other longitudinal edge. The element 70 includes connectors 76 spaced inwardly from the longitudinal edges of the element. Connectors 76 are adapted to connect to bracing elements 12 to provide resistance to bending of the formwork in the vertical plane. Elements 70 otherwise have projections 36 spaced 2o inwardly from each longitudinal edge of the element, as in the case of the curved wall elements 10 described above. Forty five degree elements 38 are used to brace the curved wall portion of elements 70 against outward bulging due to the pressure of the concrete.
2s It will be appreciated that the preferred and alternate embodiments have been specifically described, but that variations therein may be practiced without departing from the scope of the invention, which is properly defined by the claims.
Fig. 1 (a) is an enlarged view of a portion of Fig. 1 comprising two wall s elements according to the invention;
Fig. 2 is a cross-sectional view of a wall element according to the invention;
Fig. 3 is a cross-sectional view of a connector element according to the io invention;
Fig. 4 is a cross-sectional view of an alternative embodiment of the wall element of the invention;
~s Fig. 5 is a cross-sectional view of a segment of a column of formwork made from the wall elements of Fig. 4;
Fig. 5(a) is an enlarged view of a portion of Fig. 5 comprising a single wall element;
Fig. 6 is a cross-sectional view of a 45° element according to the invention;
Fig. 7 is an enlarged view of two 45° elements connected to a connector element and two curved wall elements;
2s Fig. 8 is a cross-sectional view of a section of curved formwork according to the invention joining two straight formwork sections; and, s Fig. 9 is a cross-sectional view of two connected curved wall elements, bracing elements and 45 degree elements according to an alternative embodiment.
s DETAILED DESCRIPTION OF THE PREFERRED AND
ALTERNATIVE EMBODIMENTS
A formwork structure forming a segment of a column according to the invention is shown in Fig. 1. All of the drawings show cross sectional views of the ~o elements. The elements are elongated through the plane of the drawings.
Referring to Fig. 1 and Fig. 1 (a), the formwork comprises a plurality of curved wall elements 10 connected in edge to edge relationship as at 11. Connector elements 12 extend radially from connection points 11 between adjacent elements 10.
~s Referring to Fig. 2, each curved wall element 10 comprises a curved surface 14, and a C-shaped termination 16 at each longitudinal edge 18, 20 of element 10. T-shaped key projections 36 are spaced inwardly from the longitudinal edges of element 10.
As best seen in Fig. 3, each connector element 12 comprises an elongated planar surface 22, and opposed T-shaped projections 24, 26 and 23, 25 extending outwardly from longitudinal edges 28, 30 respectively of the connector element 12.
L-shaped extensions 27, 29 serve to bracket projections 24, 26.
2s A column of formwork formed with the connector and wall elements according to the invention will provide rigidity against bending out of the vertical plane. The rigidity is provided by the curved wall elements themselves, but is thought to be significantly enhanced by the presence of radially disposed connector elements, which will tend to resist bending of the column along the plane of the connector elements. It will be appreciated that the more connectors are provided along the inside periphery s of the formwork, the greater the overall resistance to bending of the formwork will be.
The curved wall element 10 is preferably chosen to be an integral fraction of 360°. Thus, a real number of elements 10 may be used without truncation to complete a circle. In the preferred embodiment, the arc length of element 10 is chosen to be io 3.14 inches or centimeters or a multiple thereof.
Referring to Fig. 4, in an alternative embodiment of the invention, wall elements 34 comprise a plurality of wall segments 31, 33 and 35, each segment having the characteristics of element 10, but the segments are integrally formed as a is single element 34. A column of formwork made using elements 34 is illustrated in Fig. 5.
Referring to Figs. 1, 1(a), 5 and 5(a), the wall elements 10 and 34 preferably include key projections 36 extending inwardly from the inner surface of the wall 2o element and being spaced inwardly in relation to the longitudinal edges of the wall element. Key projections 36 enable the use of a 45° element 38, such use being illustrated in Fig 5.
As is best appreciated by reference to Fig. 6, 45° element 38 comprises a flat 2s planar surface 40. Each longitudinal edge terminates in a C-shaped portion 42, 44.
One of the C-shaped portions defines an angle of 45° to the planar surface 40 while the other defines an angle of 135° to the planar surface 40. As is best illustrated in Fig. 7, elements 38 may be disposed on key projections 36 so as to extend from the key projection 36 to the T-shaped projections 23, 25 of a connector element 12. The 45° elements 38 provide additional rigidity to resist outward pressure from the concrete.
s The curved wall elements 10 and the connector elements 12 may also be used to interpose a curved wall section between straight wall sections of formwork, as illustrated in Fig. 8. The curved wall elements 10 are adapted to integrate into straight formwork wall elements 50 and straight formwork connector elements 52 of the types o described in Canadian Patent No. 2,215,939, straight formwork elements 50 being provided with C-shaped portions 54 corresponding to the C-shaped terminations 16 of curved wall elements 10, and straight formwork elements 12 being provided with key projections 56 corresponding to key projections 36 of connector elements 12.
~s It may also be desirable to further enhance structural rigidity of a column of formwork by cross-bracing opposing walls. This may be accomplished by extending diametrically opposed connector elements inward so as to connect them together.
Appropriately wide connector elements may be made to extend inward from connection points between curved wall elements at diametrically opposed sides of the 2o column. The wide connector elements may be adapted to connect to one another end to end at the epicenter of the column.
It will be appreciated that the connection means between the wall elements 10 and the connector elements 12 have been illustrated in the preferred embodiment as 2s C-shaped portions on the curved wall elements 10 and cooperating opposed T-shaped portions on the connector elements 12 to form a tongue and groove type of connection. The arrangement can of course be substituted for T shaped portions at the end of the wall elements and C shaped portions on the connector elements, or indeed any other type of connection system, provided the connector elements act to secure edge to edge adjacent curved wall elements to one another.
s Similarly, the connection means between the 45° elements 38 and the key projections 36 have been illustrated in the preferred embodiment as C-shaped portions on the 45° elements and cooperating opposed T-shaped key projections on the connector elements (23, 25) and the curved wall elements (36) to form a tongue and groove type of connection. The arrangement can of course be reversed, or to indeed any other type of connection system, provided the 45°
elements act to brace the connector elements 12 to the curved wall elements 10.
In an alternative approach, the connector means between adjacent curved wall elements is as shown in Fig. 9. According to this approach, each curved wall element 70 includes a male connector 72 along one longitudinal edge and a female connector 74 along the other longitudinal edge. The element 70 includes connectors 76 spaced inwardly from the longitudinal edges of the element. Connectors 76 are adapted to connect to bracing elements 12 to provide resistance to bending of the formwork in the vertical plane. Elements 70 otherwise have projections 36 spaced 2o inwardly from each longitudinal edge of the element, as in the case of the curved wall elements 10 described above. Forty five degree elements 38 are used to brace the curved wall portion of elements 70 against outward bulging due to the pressure of the concrete.
2s It will be appreciated that the preferred and alternate embodiments have been specifically described, but that variations therein may be practiced without departing from the scope of the invention, which is properly defined by the claims.
Claims (14)
1. An elongated formwork element for casting curved surfaces in vertical concrete structures comprising:
a uniformly curved wall portion extending between the two longitudinal edges of said element; and, connectors at each longitudinal edge of said curved wall portion.
a uniformly curved wall portion extending between the two longitudinal edges of said element; and, connectors at each longitudinal edge of said curved wall portion.
2. A formwork element as in claim 1 wherein the connectors at each longitudinal edge are mirror images of each other.
3. A formwork element as in claim 1 further comprising at least two projections extending radially inward from said curved wall portion, one of said projections being spaced inwardly from one longitudinal edge of said curved wall portion and another of said projections being spaced inwardly from the other longitudinal edge of said curved wall portion.
4. An elongated formwork connector element for use in casting curved surfaces in vertical concrete structures comprising:
an elongated straight planar surface having two longitudinal edges; and, one of said longitudinal edges having two connectors on opposite sides of said planar surface.
an elongated straight planar surface having two longitudinal edges; and, one of said longitudinal edges having two connectors on opposite sides of said planar surface.
5. A connector element as in claim 4 wherein the other longitudinal edge of said planar surface has two connectors on opposite sides of said planar surface.
6. A connector element as in claim 5 wherein said connectors are mirror images of one another.
7. A connector element as in claim 6 wherein one of said longitudinal edges further includes two L shaped projections extending from opposite sides of said planar surface so as to encompass the connectors at said longitudinal edge.
8. A kit of formwork elements comprising formwork elements according to claim and connector elements according to claim 4.
9. A kit of formwork elements comprising formwork elements according to claim and connector elements according to claim 4.
10. An assembly of formwork for casting curved surfaces in vertical concrete structures comprising:
a plurality of elongated curved wall elements according to claim 2 disposed in edge adjacent relationship; and, a plurality of connector elements according to claim 4, each of said connector elements being disposed such that one of the connectors of said connector element engages the connector element on a longitudinal edge of a first one of said curved wall elements and the other connector of said connector element
a plurality of elongated curved wall elements according to claim 2 disposed in edge adjacent relationship; and, a plurality of connector elements according to claim 4, each of said connector elements being disposed such that one of the connectors of said connector element engages the connector element on a longitudinal edge of a first one of said curved wall elements and the other connector of said connector element
11 engages the connector element on a longitudinal edge of a curved wall element which is edge adjacent to said first curved wall element.
11. An assembly as in claim 10 wherein said curved wall elements are curved wall element according to claim 3 and said connector elements are connector elements according to claim 6 and further comprising a plurality of bracing elements each having a flat planar portion, two longitudinal edges and a connector at each longitudinal edge, one of the connectors of each bracing element being connected to one of said projections of one of said curved wall elements and the other connector of each bracing element being connected to one of the connectors at one end of one of said connector elements.
11. An assembly as in claim 10 wherein said curved wall elements are curved wall element according to claim 3 and said connector elements are connector elements according to claim 6 and further comprising a plurality of bracing elements each having a flat planar portion, two longitudinal edges and a connector at each longitudinal edge, one of the connectors of each bracing element being connected to one of said projections of one of said curved wall elements and the other connector of each bracing element being connected to one of the connectors at one end of one of said connector elements.
12. A formwork element as in claim 1 or claim 3 wherein the arc angle defined between the longitudinal edges is an even fraction of 360°.
13. A formwork element as in claim 1 wherein the arc length defined between the longitudinal edges is 3.14 inches or centimeters or a multiple thereof.
14. An elongated formwork element for casting curved surfaces in vertical concrete structures comprising:
a uniformly curved wall portion extending between the two longitudinal edges of said element;
a male connector at one longitudinal edge of said curved wall portion;
a female connector at the other longitudinal edge of said curved wall portion;
said male connector being adapted to connect to the female connector of a similar curved wall element;
at least two projections extending radially inward from said curved wall portion, one of said projections being spaced inwardly from one longitudinal edge of said curved wall portion and another of said projections being spaced inwardly from the other longitudinal edge of said curved wall portion; and, connector means spaced inward from the longitudinal edges.
a uniformly curved wall portion extending between the two longitudinal edges of said element;
a male connector at one longitudinal edge of said curved wall portion;
a female connector at the other longitudinal edge of said curved wall portion;
said male connector being adapted to connect to the female connector of a similar curved wall element;
at least two projections extending radially inward from said curved wall portion, one of said projections being spaced inwardly from one longitudinal edge of said curved wall portion and another of said projections being spaced inwardly from the other longitudinal edge of said curved wall portion; and, connector means spaced inward from the longitudinal edges.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2299193 CA2299193A1 (en) | 2000-02-23 | 2000-02-23 | Formwork for creating columns and curved walls |
AU2001235296A AU2001235296A1 (en) | 2000-02-23 | 2001-02-23 | Formwork for creating columns and curved walls |
PCT/CA2001/000228 WO2001063066A1 (en) | 2000-02-23 | 2001-02-23 | Formwork for creating columns and curved walls |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2299193 CA2299193A1 (en) | 2000-02-23 | 2000-02-23 | Formwork for creating columns and curved walls |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2299193A1 true CA2299193A1 (en) | 2001-08-23 |
Family
ID=4165369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2299193 Abandoned CA2299193A1 (en) | 2000-02-23 | 2000-02-23 | Formwork for creating columns and curved walls |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001235296A1 (en) |
CA (1) | CA2299193A1 (en) |
WO (1) | WO2001063066A1 (en) |
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WO2017113016A1 (en) | 2015-12-31 | 2017-07-06 | Cfs Concrete Forming Systems Inc. | Structure-lining apparatus with adjustable width and tool for same |
EP3607152B1 (en) | 2017-04-03 | 2023-09-27 | CFS Concrete Forming Systems Inc. | Longspan stay-in-place ceiling liners |
CA3084840C (en) | 2017-12-22 | 2024-04-16 | Cfs Concrete Forming Systems Inc. | Snap-together standoffs for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures |
WO2020160684A1 (en) | 2019-02-08 | 2020-08-13 | Cfs Concrete Forming Systems Inc. | Retainers for restoring, repairing, reinforcing, protecting, insulating and/or cladding structures |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2076472A (en) * | 1936-02-26 | 1937-04-06 | London Bernard | Building construction |
US4703602A (en) * | 1985-09-09 | 1987-11-03 | National Concrete Masonry Association | Forming system for construction |
US4866891A (en) * | 1987-11-16 | 1989-09-19 | Young Rubber Company | Permanent non-removable insulating type concrete wall forming structure |
FR2717848B1 (en) * | 1994-03-23 | 1996-05-31 | Desjoyaux Piscines | Panel for the creation of retention basins. |
US5491947A (en) * | 1994-03-24 | 1996-02-20 | Kim; Sun Y. | Form-fill concrete wall |
US6219984B1 (en) | 1995-05-11 | 2001-04-24 | Francesco Piccone | Interconnectable formwork elements |
CA2218600C (en) * | 1995-05-11 | 1999-08-31 | Francesco Piccone | Modular formwork elements and assembly |
US5740648A (en) * | 1996-05-14 | 1998-04-21 | Piccone; Francesco | Modular formwork for concrete |
DE29803155U1 (en) * | 1998-02-23 | 1998-04-23 | Betonwerk Theodor Pieper GmbH & Co. KG, 57392 Schmallenberg | Formwork aid |
-
2000
- 2000-02-23 CA CA 2299193 patent/CA2299193A1/en not_active Abandoned
-
2001
- 2001-02-23 AU AU2001235296A patent/AU2001235296A1/en not_active Abandoned
- 2001-02-23 WO PCT/CA2001/000228 patent/WO2001063066A1/en active Application Filing
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10407895B2 (en) * | 2016-12-23 | 2019-09-10 | Dieter Krohmer | Portable modular system for structural assemblies |
US11078666B2 (en) | 2017-03-06 | 2021-08-03 | Csr Building Products Limited | Formwork system |
US11732472B2 (en) | 2017-03-06 | 2023-08-22 | Csr Building Products Limited | Formwork system |
Also Published As
Publication number | Publication date |
---|---|
WO2001063066A1 (en) | 2001-08-30 |
AU2001235296A1 (en) | 2001-09-03 |
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