GB2389125A - A formwork connector - Google Patents

A formwork connector Download PDF

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Publication number
GB2389125A
GB2389125A GB0212543A GB0212543A GB2389125A GB 2389125 A GB2389125 A GB 2389125A GB 0212543 A GB0212543 A GB 0212543A GB 0212543 A GB0212543 A GB 0212543A GB 2389125 A GB2389125 A GB 2389125A
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GB
United Kingdom
Prior art keywords
connector
layers
formwork
anchor means
extension
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.)
Withdrawn
Application number
GB0212543A
Other versions
GB0212543D0 (en
Inventor
Jack Abbott
Ulrich Nonn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0212543A priority Critical patent/GB2389125A/en
Publication of GB0212543D0 publication Critical patent/GB0212543D0/en
Publication of GB2389125A publication Critical patent/GB2389125A/en
Withdrawn legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/84Walls made by casting, pouring, or tamping in situ
    • E04B2/86Walls made by casting, pouring, or tamping in situ made in permanent forms
    • E04B2/8652Walls made by casting, pouring, or tamping in situ made in permanent forms with ties located in the joints of the forms
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38Connections for building structures in general
    • E04B1/41Connecting devices specially adapted for embedding in concrete or masonry
    • E04B1/4178Masonry wall ties

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

Abstract

A formwork structure comprises first and second layers (2, 3, Figure 3) having a space there between to be filled with concrete, and a plurality of connectors (1) keeping the layers apart, where each connector includes an elongate shaft (30) and first and second anchor means (31, 32) connectable in use to the first and second layers respectively and further include at least one extension portion (36), extending beyond th first or second anchor means, and which in use, protrudes from one of the layers for connection to an external structure. Preferably the anchor means is the form of a hook or loop which in use engages a peg (5, 6 Figure 7) located on the layers. The extension element may be threaded (38) or grooved (37) and extend coaxial with the elongate shaft. Also disclosed is a formwork connector per se and a wall formed from formwork and disclosed above.

Description

1 2389 1 25
CONNECTOR FOR FORMWORK. A FORMWORK STRUCTURE AND
A WALL CONSTRUCTION COMPRISING A FORMWORK STRUCTURE
The present invention relates to a connector for 5 use in formwork of the type comprising first and second layers defining a space therebetween to be filled with concrete. Further, the invention describes a formwork structure for a wall construction comprising said connectors and a wall construction 10 formed from said formwork structure.
Formwork is commonly used in the construction of structures such as wall constructions from concrete.
The formwork is erected to provide a shell structure into which the flowable concrete is poured. The 15 formwork acts as both a structural support during setting of the concrete and also as a guide for accurately determining the dimensions and shape of the finished structure. Such formwork may be of the temporary type or the permanent type. Temporary 20 formwork is removed once the poured concrete has set.
Permanent formwork remains as part of the finished construction. EP 0 117 443 describes one particular type of permanent formwork wherein two layers are formed from plates held spaced apart by connecting 25 elements. The connecting elements have a stay and, standing of upwardly and downwardly at at least one end of the stay, pegs which are inserted into corresponding recesses at the upper and lower sides of the plates. Preferably, the plates are formed from 30 foamed polystyrene or mineral building material.
The present invention aims to provide an improved formwork structure by providing means for structurally connecting external structures to the structure formed from the poured concrete.
35 Accordingly, the present invention provides a formwork structure for a wall construction comprising
first and second layers and a plurality of connectors, said first and second layers defining a space therebetween to be filled with concrete, said connectors holding said first and second layers in 5 spaced relationship, each of said connectors comprising an elongate shaft for spanning said space and first and second anchor means connectable in use to said first and second layers, wherein at least a proportion of said connectors further comprise one or 10 more extension elements extending beyond at least one of said first or second anchor means so as to protrude from one of said first or second layers for connection to an external structure.
There is also provided a wall construction 15 comprising a formwork structure as described above having said space between said first and second layers filled with concrete, wherein at least one external structure is connected to said extension elements protruding from said first or second layer.
20 There is further provided a connector for formwork of the type comprising first and second layers defining a space therebetween to be filled with concrete, said connector comprising an elongate shaft for spanning said space and first and second anchor 25 means connectable in use to said first and second layers of said formwork, wherein said connector further comprises one or more extension elements extending beyond at least one of said first or second anchor means so as, in use, to protrude from one of -
30 said first or second layers of said formwork for connection to an external structure.
Embodiments of the present invention will now be described by way of example only with reference to the -
accompany drawings in which: Figure 1 is a plan view of a first embodiment of connector according to the present invention;
- 3 Figure 2 is a plan view of a second embodiment of connector according to the present invention; Figure 3 is a sectional view of a wall construction formed using the connectors of Figures 1 5 or 2; Figure 4 is an external view of the wall construction of Figure 3; Figure 5 is a sectional view of another wall construction formed using the connectors of Figures 1 10 or 2; Figure 6 is an external view of the wall construction of Figure 5i Figure 7 is a perspective view of a formwork structure according to the present invention using the 15 connectors of Figures 1 or 2; Figure 8 is a perspective view of the connectors of Figures 1 or 2 in combination with locating pegs; Figure 9 is a perspective view of a conventional connector with locating pegs; 20 Figure 10 is a perspective view of a combination of connectors according to the present invention and locating pegs; and Figure 11 is a cross-sectional view of a formwork structure incorporating connectors of the type shown 25 in Figure 10.
Figure 7 illustrates a formwork structure according to the present invention. The basic elements of the formwork structure are plates 2 and 3, 30 end plates 8, connectors 1 and pegs 5 and 6. The plates 2 and 3 define the inner and outer faces of a void space 41 in which in use flowable concrete is poured to form a structure such as a wall construction. The plates 2 and 3 are formed from a 35 plurality of interlocking elements. The interlocking elements have a plurality of cylindrical, vertically orientated recesses 7 formed therein. End plates 8
4 - interlock with plates 2 and 3 to define the end faces of the void space 41. During assembly of the formwork structure, pegs 5 and 6 are inserted in recesses 7 for a purpose that will be described below. The plates 2 5 and 3 are preferably formed from a foamed or expanded polystyrene. They may also be made from other building materials such as mineral wool.
The plates 2 and 3, end plates 8 and pegs 5 and 6 are conventional and are described in detail in EP O 10 117 443, the entire contents of which are herein incorporated by reference.
In the formwork structure described in EP 0 117 443, connectors l' as shown in Figures 7 and 9 are used to connect between the pegs 5 and inserted 15 respectively in the plates 2 and 3 so as to keep the plates 2 and 3 in spaced relationship from one another before and during the concrete pour and whilst the concrete is setting. As shown in Figure 9, the connector 1' comprises a metal elongated shaft which 20 is embedded in or otherwise fixed to each of the pegs 5 and 6. In an alternative embodiment described in EP 0 117 443, the elongate shaft is connected to the pegs 5 and 6 by means of the elongate shaft being bent into hook formations at each end which are received around 25 the pegs 5 and 6.
According to the present invention, there is provided a modified and improved connector 1 as shown in Figures 1 and 2 for use in a variety of formwork structures. In the following description, the
30 improved connector 1 will be described for use in a formwork structure of the type described in EP 0 117 443 and shown in, for example, Figure 7 of the attached drawings. However, it will be appreciated that the improved connector 1 may be utilised in other 35 formwork structures of the permanent type, other than the specific formwork structure described hereafter.
With reference to Figure l, a first embodiment of
- 5 the improved connector 1 comprises an elongate shaft 30 having anchor means formed at either end. The anchor means is in the form of two hook structures 31 and 32 formed by bending or otherwise deforming the 5 elongate shaft 30 at each end so as to form a substantially circular element defining recesses 33 and 34 in which in use the pegs 5 and 6 may be received as shown in Figure 8. In accordance with the present invention, at least one extension element 36 10 is provided as part of the connector 1 which element 36 extends beyond the anchor means formed by the hook structure 32. As shown in Figure 1, the extension element 36 comprises an elongate shaft which is rigidly connected to hook structure 32 by means of a 15 butt weld 35. The extension element 36 is preferably formed from the same material as the elongate shaft 30. At a distal end of the extension element 36, there is provided a friction enhancing means in the form of a series of circumferential grooves.
20 Figure 2 shows an alternative embodiment of the improved connector 1 having the same essential components except that the friction enhancing means of the circumferential grooves 37 is replaced by a screw thread formation 38.
25 In Figures 1 and 2, the improved connector 1 is illustrated with one extension element 36 fixed to the hook formation 32. Alternatively, a single extension element 36 may be provided attached to the opposite hook structure 31 or, indeed, two extension elements 30 36 may be provided, one attached to each of the hook structures 31 and 32 The connectors 1 are formed from metal and preferably from stainless steel.
The improved connectors 1 are used as part of a 35 formwork structure, an example of which is shown in Figure 7. As can be seen in Figure 7, the improved connectors 1 are located over pegs 5 and 6 received in
6 - the recesses 7 of plates 2 and 3, When in position, the extension elements 36 protrude beyond the external faces of plates 2 and 3. As illustrated in Figure 7, the extension elements 36 are shown protruding from 5 the external face of plate 3. However, the extension elements 36 may be reversed to protrude from the external face of plate 2 if desired or extension elements 36 may protrude from both plates 2 and 3. In the assembly shown in Figure 7, every third connector 10 has been shown as an improved connector 1. The intervening connectors are formed by conventional connectors 1' of the type described in EP 0 117 443.
The proportion of improved connectors 1 used may be altered as desired up to and including using only 15 improved connectors 1 throughout the entire formwork structure. Figures 3 and 4 illustrate a first embodiment of wall construction formed using a formwork structure of the type shown in Figure 7. Multiple layers of the 20 formwork structure are arranged one on top of the other in a series of courses. Locating nodules 9 formed along the upper edge of the interlocking elements of one course engage in corresponding recesses formed along the lower edge of the 25 interlocking elements of the course immediately above.
In this way the courses are positively located with respect to one another. The lowest course is located on a stable foundation such as the earth or a concrete raft 53. A layer of brickwork 50 is formed parallel 30 to and in close proximity to plate 2. The brickwork is formed from a plurality of bricks 51 joined by mortar 52 in a conventional manner. The extension elements 36 of the improved connectors 1 are received in the gaps between the bricks 51 and thus rigidly 35 embedded in the mortar 52 creating a mechanical link between the brickwork layer 50 and the formwork structure. Once the concrete is poured into the void
- 7 space 41 and has set, a mechanical link is formed between the connectors 1 and the brickwork layer 50.
Alternatively, the extension elements 36 may be received in holes in the bricks 51 rather than in the S mortar 52. In the construction shown in Figure 3, the connectors of Figure 1 having the 're-bar' type finish of a series of circumferential grooves 37 would be used. Figures 5 and 6 illustrate a second embodiment of 10 wall construction which differs from Figure 3 and 4 in that the external structure is a half-thickness layer of brickwork 60 formed frm half-thickness bricks 61 and mortar 52.
Figures 10 and 11 illustrate how the improved 15 connectors 1 may be used in a corner detail of a wall construction. As described in EP 0 117 443, the connectors may be interlocked within the void space at the corners of wall constructions by using connectors 70 having one anchor hook 72 and an elongate shaft 20 terminating at the distal end in a barb formation 73 which is received over the shaft of a transverse running connector. According to the present invention, the connectors 70 may also comprise extension elements 76 of the type described above 25 which can be used as shown in Figure 11 for mechanical fixing external structures to the concrete core at or near a corner formation.
The connectors 1, 70 of the present invention may be used to connect a wide variety of external 30 structures to both the interior and exterior of wall constructions and other massive structures. For example, the connector of Figure 2 having the screw threaded extension element 36 may be used for attaching fixtures and fittings which are themselves 35 not structural, for example, cupboards, stairs etc., as well as structures capable of being fixed by means of a bolt connector. The connectors 1 may also be
8 - used for attaching floor constructions or slabs to the wall constructions.

Claims (1)

  1. - 9 - Claims:
    1. Formwork structure for a wall construction comprising first and second layers and a plurality of 5 connectors, said first and second layers defining a space therebetween to be filled with concrete, said connectors holding said first and second layers in spaced relationship, each of said connectors comprising an elongate shaft for spanning said space 10 and first and second anchor means connectable in use to said first and second layers, wherein at least a proportion of said connectors further comprise one or more extension elements extending beyond at least one of said first or second anchor means so as to protrude 15 from one of said first or second layers for connection to an external structure.
    2. Formwork structure as claimed in claim l wherein a proportion of said connectors comprise an extension 20 element at one or other of said first and second anchor means.
    3. Formwork structure as claimed in claim 1 wherein a proportion of said connectors comprise an extension 25 element at both of said first and second anchor means.
    4. Formwork structure as claimed in any preceding claim wherein said extension element comprises an elongate shaft extending from said anchor means.
    5. Formwork structure as claimed in claim 4 wherein the elongate shaft of the extension element is co-
    axial with the elongate shaft spanning between the first and second layers.
    6. Formwork structure as claimed in any preceding claim wherein said extension element comprises a
    - 10 threaded portion.
    7. Formwork structure as claimed in any of claims 1 to 5 wherein said extension element comprises a series 5 of circumferential grooves.
    8. Formwork structure as claimed in any preceding claim wherein said extension element is welded to said anchor means.
    9. Formwork structure as claimed in any preceding claim wherein said anchor means comprises a hook or loop structure for receiving a peg or similar element connected to said first or second layers.
    lo. Formwork structure as claimed in any preceding claim wherein said connector is metal.
    11. Formwork structure as claimed in any preceding 20 claim wherein said connector is stainless steel.
    12. A wall construction comprising a formwork structure as claimed in any preceding claim having said space between said first and second layers filled 25 with concrete, wherein at least one external structure is connected to said extension elements protruding from said first or second layer.
    13. A wall construction as claimed in claim 12 30 wherein said external structure is a layer of bricks or brick facing.
    14. A wall construction as claimed in claim 13 wherein said extension elements are embedded in mortar 35 between said bricks.
    A wall construction as claimed in any of claims
    - 11 12 to 14 wherein said external structure is connected on an indoor face of said wall construction.
    16. A wall construction as claimed in any of claims 5 12 to 14 wherein said external structure is connected on an outdoor face of said wall construction 17. Connector for formwork of the type comprising first and second layers defining a space therebetween 10 to be filled with concrete, said connector comprising an elongate shaft for spanning said space and first and second anchor means connectable in use to said first and second layers of said formwork, wherein said connector further comprises one or more extension 15 elements extending beyond at least one of said first or second anchor means so as, in use, to protrude from one of said first or second layers of said formwork for connection to an external structure.
    20 18. Connector as claimed in claim 17 wherein said connector comprises an extension element at one or other of said first and second anchor means.
    l9. Connector as claimed in claim 17 wherein said 25 connector comprises an extension element at both of said first and second anchor means.
    20. Connector as claimed in any of claims 17 to 19 wherein said extension element comprises an elongate 30 shaft extending from said anchor means.
    21. Connector as claimed in claim 20 wherein the elongate shaft of the extension element is co-axial with the elongate shaft spanning between the first and 35 second layers.
    22. Connector as claimed in any of claims 17 to 21
    - 12 wherein said extension element comprises a threaded portion. 23. Connector as claimed in any of claims 17 to 21 5 wherein said extension element comprises a series of circumferential grooves.
    24. Connector as claimed in any of claims 17 to 23 wherein said extension element is welded to said 10 anchor means.
    25. Connector as claimed in any of claims 17 to 24 wherein said anchor means comprises a hook or loop structure for receiving a peg or similar element 15 connected to said first or second layers.
    26. Connector as claimed in any of claims 17 to 25 wherein said connector is metal.
    20 27. Connector as claimed in claim 26 wherein said connector is stainless steel.
    28. Formwork structure substantially as hereinbefore described with reference to or as shown in the 25 accompanying drawings.
    29. A wall construction substantially as hereinbefore described with reference to or as shown in the accompanying drawings.
    20. Connector substantially as hereinbefore described with reference to or as shown in the accompanying drawings.
GB0212543A 2002-05-30 2002-05-30 A formwork connector Withdrawn GB2389125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0212543A GB2389125A (en) 2002-05-30 2002-05-30 A formwork connector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0212543A GB2389125A (en) 2002-05-30 2002-05-30 A formwork connector

Publications (2)

Publication Number Publication Date
GB0212543D0 GB0212543D0 (en) 2002-07-10
GB2389125A true GB2389125A (en) 2003-12-03

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Family Applications (1)

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GB0212543A Withdrawn GB2389125A (en) 2002-05-30 2002-05-30 A formwork connector

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB170033A (en) * 1920-05-13 1921-10-13 Walter Palmer Hayes Improvements in or relating to concrete building
US1924724A (en) * 1932-02-15 1933-08-29 Charles M Read Concrete wall and method of building and finishing same
US5040344A (en) * 1989-05-31 1991-08-20 Philippe Durand Prefabricated forms for concrete walls
JPH07238602A (en) * 1994-02-28 1995-09-12 Tohoku Shizai Kogyo Kk Wall structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB170033A (en) * 1920-05-13 1921-10-13 Walter Palmer Hayes Improvements in or relating to concrete building
US1924724A (en) * 1932-02-15 1933-08-29 Charles M Read Concrete wall and method of building and finishing same
US5040344A (en) * 1989-05-31 1991-08-20 Philippe Durand Prefabricated forms for concrete walls
JPH07238602A (en) * 1994-02-28 1995-09-12 Tohoku Shizai Kogyo Kk Wall structure

Also Published As

Publication number Publication date
GB0212543D0 (en) 2002-07-10

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