EP0034899B1 - Jointing techniques for concrete members - Google Patents

Jointing techniques for concrete members Download PDF

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Publication number
EP0034899B1
EP0034899B1 EP81300606A EP81300606A EP0034899B1 EP 0034899 B1 EP0034899 B1 EP 0034899B1 EP 81300606 A EP81300606 A EP 81300606A EP 81300606 A EP81300606 A EP 81300606A EP 0034899 B1 EP0034899 B1 EP 0034899B1
Authority
EP
European Patent Office
Prior art keywords
concrete
link
strip
links
cast
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.)
Expired
Application number
EP81300606A
Other languages
German (de)
French (fr)
Other versions
EP0034899A1 (en
Inventor
John David Clapson
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.)
Square Grip Ltd
Original Assignee
Square Grip 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
Application filed by Square Grip Ltd filed Critical Square Grip Ltd
Priority to AT81300606T priority Critical patent/ATE9110T1/en
Publication of EP0034899A1 publication Critical patent/EP0034899A1/en
Application granted granted Critical
Publication of EP0034899B1 publication Critical patent/EP0034899B1/en
Expired legal-status Critical Current

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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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/125—Reinforcement continuity box
    • 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
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/005—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with anchoring or fastening elements for the shaped articles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry

Definitions

  • This invention relates to jointing techniques for concrete members and particularly to strips of spaced reinforcement members used in such techniques.
  • the invention also relates to a method of connecting concrete members using a strip of spaced reinforcement members.
  • a jointing technique for concrete members is known from British Patent Specification No. GB-A-1,472,389.
  • a strip of spaced reinforcement members which comprises a plurality of bent rods of which the free ends are anchored in a block of foam material.
  • the strip is cast with concrete in a former or shuttering with the foam material outermost to form a first concrete member.
  • the exposed foam material may be cut or excavated away, revealing the free ends of the bent rods.
  • the remainder of each rod is firmly embedded in the concrete.
  • the rod ends are then straightened such that they extend away from the concrete for incorporation in a second concrete member which is cast against the first.
  • the two members are thus securely connected by means of the rods which will be firmly anchored in both.
  • the above technique has the disadvantage that the rods must be bent on two occasions at least to achieve alignment with the second member when it is cast. As a consequence, the metal of the rods can be weakened with resulting loss of assured strength of the connection. Additionally, the shape of the free ends is limited by the size and shape of the block of foam material.
  • the present invention is directed at overcoming these problens and provides a substantial solution by dividing each "rod" into two parts; namely a link and a connecting rod.
  • the method of the invention uses a strip of spaced reinforcement links with a length of each link embedded in a block of non-concrete material, which strip is cast in a first concrete member with the block of non-concrete material exposed at a surface thereof and the links partially embedded in the concrete; in which the non-concrete material is removed to expose said lengths of each link; and in which a second concrete member is cast against the first member and exposed lengths of link.
  • each link is an effectively endless length of rod
  • the strip is formed with a single continuous length of each link embedded in the block of non-concrete material; a plurality of reinforcement members are coupled to said lengths of link exposed after the non-concrete material is removed; and the second concrete member is cast around the connecting member and links.
  • the connecting member may take any chosen shape to suit the second member and may be used to pre- or post-tension the second member.
  • a number of connecting members may also be combined to form a single connecting unit which couples to all or some of the loops or rungs formed by the exposed continuous lengths of links. This can enhance the bonding to the second member.
  • Each link normally takes the form of an annular shape and a generally triangular configuration is particularly preferred. It is also sometimes desirable to include an anchorage bar extending at least between the links within the block of non-concrete material. Such anchorage bar may be welded to the links but this is not essential as it might extend beyond the foam to itself anchor in the concrete or merely be held loosely in place by the loops or rungs after the foam material has been removed.
  • FIG. 1 is a perspective view of a strip of reinforcement members used in a method according to the invention during the course of its manufacture
  • the strip of reinforcement members shown in Figure 1 comprises a plurality of generally triangular links 2, each of which has one corner 4 in a block 6 of foam material.
  • the block 6 is illustrated as being transparent so that the arrangement of links can be seen although in practice it is unlikely to be so).
  • Extending within the links 2 is an anchorage bar 8 which may be welded against the corners 4.
  • the block 6 of foam material is sufficiently thick to wholly cover the anchorage bar 8 and form a layer of at least its thickness over the anchorage bar.
  • the strip shown in Figure 1 is manufactured by holding the links 2 and the bar 8 in the orientation shown with the corners 4 within a trough of trapezium section. Polyurethane foam is then cast in the trough around the corners 2 and bar 8 to complete the strip.
  • Figures 2 to 5 illustrate steps in the use of the strips shown in Figure 1 to form a secure joint between two concrete members which may for example be a main wall and a partition wall.
  • Figure 2 shows a transverse section through a main wall 10 which is cast against shuttering 14 with the block 6 against one of the shutters.
  • the block 6 may be lightly adhered to the shutter to hold it in place during casting. Alternatively, it may itself form part of the shuttering.
  • approximately two- thirds of each link is embedded in concrete and, upon curing thereof, each link is securely held thereby.
  • the foam material is then removed by excavation or using a solvent so that the corners 4 and the anchorage bar 8 are exposed within a recess 16 which is shown in Figure 3.
  • Connecting members 18 are then coupled to the anchorage bar 8 as shown in Figures 3 and 4. It will be appreciated that the connecting members 18 may be coupled directly to the links 2 if desired and it is therefore not essential to include the anchorage bar, although its use is preferred as it simplifies the manufacture of the strip and allows additional flexibility in the attachment of connecting members.
  • Figure 5 shows in section a joint between a main wall 20 and a partition wall 22 incorporating a strip of the kind shown in Figure 1.
  • the partition wall is cast against the main wall 20, concrete fills the recess 1 6 forming a mortice/tenon type joint as a consequence of the trapezium section of the block 6.
  • the use of separate connecting members 18 permits the use of other reinforcing elements 24 ( Figure 5) or plates 26 ( Figure 4) to form a lattice structure which serves both to locate the connecting members 18 and to enhance the bonding of the connecting members 18 in the concrete of the partition wall 22.
  • the links 2 may also be used to connect tensile reinforcement rods in the partition wall for pre- or post-tensioning.

Abstract

A method of making a structural joint between two cast concrete members using a strip of spaced reinforcement links (2) with a length of each link (2) embedded in a block (6) of a non-concrete material, in which a first concrete member (10, 20) is cast incorporating the strip with the block (6) of non-concrete material exposed at a surface thereof and the links (2) partially embedded in the concrete; and the non-concrete material is removed to expose said lengths of each link, about which a second concrete member (22) is cast. In order to improve the joint between the members (10, 20, 22) the strip is formed with a single continuous length of each link (2) embedded in the block (6) of non-concrete material and at least one connecting member (18) is coupled to the said lengths of link (2) exposed after the non-concrete material is removed, before the second concrete member (22) is cast around the connecting member (18) and links (2).

Description

  • This invention relates to jointing techniques for concrete members and particularly to strips of spaced reinforcement members used in such techniques. The invention also relates to a method of connecting concrete members using a strip of spaced reinforcement members.
  • A jointing technique for concrete members is known from British Patent Specification No. GB-A-1,472,389. In this specification a strip of spaced reinforcement members is disclosed which comprises a plurality of bent rods of which the free ends are anchored in a block of foam material. In use, the strip is cast with concrete in a former or shuttering with the foam material outermost to form a first concrete member. When the concrete has cured, the exposed foam material may be cut or excavated away, revealing the free ends of the bent rods. The remainder of each rod is firmly embedded in the concrete. The rod ends are then straightened such that they extend away from the concrete for incorporation in a second concrete member which is cast against the first. The two members are thus securely connected by means of the rods which will be firmly anchored in both.
  • The above technique has the disadvantage that the rods must be bent on two occasions at least to achieve alignment with the second member when it is cast. As a consequence, the metal of the rods can be weakened with resulting loss of assured strength of the connection. Additionally, the shape of the free ends is limited by the size and shape of the block of foam material.
  • Another jointing technique is disclosed in British Patent Specification No. GB-A-1,319,589. In this specification, a method is disclosed for forming a concrete member with a fitting projecting therefrom in which the fitting is first partially embedded in a destructable material to form a body which is made a part of the cast concrete member with the destructable material exposed. The destructable material is then removed to expose the fitting and the member may then be used to form a continuous structural joint as described therein. This technique again has the disadvantage that the amount of "exposed" fitting which is embedded in the joint is limited.
  • The present invention is directed at overcoming these problens and provides a substantial solution by dividing each "rod" into two parts; namely a link and a connecting rod. As in the prior art, the method of the invention uses a strip of spaced reinforcement links with a length of each link embedded in a block of non-concrete material, which strip is cast in a first concrete member with the block of non-concrete material exposed at a surface thereof and the links partially embedded in the concrete; in which the non-concrete material is removed to expose said lengths of each link; and in which a second concrete member is cast against the first member and exposed lengths of link. In the invention however, each link is an effectively endless length of rod, the strip is formed with a single continuous length of each link embedded in the block of non-concrete material; a plurality of reinforcement members are coupled to said lengths of link exposed after the non-concrete material is removed; and the second concrete member is cast around the connecting member and links.
  • The connecting member may take any chosen shape to suit the second member and may be used to pre- or post-tension the second member. A number of connecting members may also be combined to form a single connecting unit which couples to all or some of the loops or rungs formed by the exposed continuous lengths of links. This can enhance the bonding to the second member.
  • Each link normally takes the form of an annular shape and a generally triangular configuration is particularly preferred. It is also sometimes desirable to include an anchorage bar extending at least between the links within the block of non-concrete material. Such anchorage bar may be welded to the links but this is not essential as it might extend beyond the foam to itself anchor in the concrete or merely be held loosely in place by the loops or rungs after the foam material has been removed.
  • The invention will now be described by way of example and with reference to the accompanying drawing wherein:-Figure 1 is a perspective view of a strip of reinforcement members used in a method according to the invention during the course of its manufacture;
    • Figure 2 is a transverse section through a portion of a concrete member having the strip of reinforcement members shown in Figure 1 incorporated therein;
    • Figure 3 is a longitudinal section through the concrete member of Figure 2;
    • Figure 4 is a perspective view showing the connecting rods attached to the links, the concrete of the member not being shown for clarity; and
    • Figure 5 is a section through a joint between a main wall and a partition wall using the strip of Figure 1.
  • The strip of reinforcement members shown in Figure 1 comprises a plurality of generally triangular links 2, each of which has one corner 4 in a block 6 of foam material. (The block 6 is illustrated as being transparent so that the arrangement of links can be seen although in practice it is unlikely to be so). Extending within the links 2 is an anchorage bar 8 which may be welded against the corners 4. The block 6 of foam material is sufficiently thick to wholly cover the anchorage bar 8 and form a layer of at least its thickness over the anchorage bar.
  • The strip shown in Figure 1 is manufactured by holding the links 2 and the bar 8 in the orientation shown with the corners 4 within a trough of trapezium section. Polyurethane foam is then cast in the trough around the corners 2 and bar 8 to complete the strip.
  • Figures 2 to 5 illustrate steps in the use of the strips shown in Figure 1 to form a secure joint between two concrete members which may for example be a main wall and a partition wall. Figure 2 shows a transverse section through a main wall 10 which is cast against shuttering 14 with the block 6 against one of the shutters. The block 6 may be lightly adhered to the shutter to hold it in place during casting. Alternatively, it may itself form part of the shuttering. As can be seen, approximately two- thirds of each link is embedded in concrete and, upon curing thereof, each link is securely held thereby. The foam material is then removed by excavation or using a solvent so that the corners 4 and the anchorage bar 8 are exposed within a recess 16 which is shown in Figure 3. Connecting members 18 are then coupled to the anchorage bar 8 as shown in Figures 3 and 4. It will be appreciated that the connecting members 18 may be coupled directly to the links 2 if desired and it is therefore not essential to include the anchorage bar, although its use is preferred as it simplifies the manufacture of the strip and allows additional flexibility in the attachment of connecting members.
  • Figure 5 shows in section a joint between a main wall 20 and a partition wall 22 incorporating a strip of the kind shown in Figure 1. As can be seen, as the partition wall is cast against the main wall 20, concrete fills the recess 1 6 forming a mortice/tenon type joint as a consequence of the trapezium section of the block 6. The use of separate connecting members 18 permits the use of other reinforcing elements 24 (Figure 5) or plates 26 (Figure 4) to form a lattice structure which serves both to locate the connecting members 18 and to enhance the bonding of the connecting members 18 in the concrete of the partition wall 22. It will also be appreciated that the links 2 may also be used to connect tensile reinforcement rods in the partition wall for pre- or post-tensioning.
  • While the invention has been particularly described herein with reference to the building of cast concrete walls, it will be understood that the jointing technique disclosed can be employed in many other applications where an integral joint between concrete members is to be formed. It will also be understood that the present invention may be employed to connect steel reinforcement in one concrete member to that in another.

Claims (5)

1. A method of making a structural joint between two cast concrete members using a strip of spaced reinforcement links (2) with a length of each link (2) embedded in a block (6) of non-concrete material, which strip is cast in a first concrete member (10, 20) incorporating the strip with the block (6) of non-concrete material exposed at a surface thereof and the links (2) partially embedded in the concrete; and in which the non-concrete material is removed to expose said lengths of each link (2); and in which a second concrete member (22) is cast against the first member (10, 22) and around the exposed lengths of link (2); characterized in that each link (2) is an effectively endless length of rod, the strip being formed with a single continuous length of each link (2) embedded in the block (6) of non-concrete material; a plurality of reinforcement members (18) are coupled to said lengths of link (2) exposed after the non-concrete material is removed, and the second concrete member (22) is cast around the member (18) and links (2).
2. A method according to Claim 1 characterized in that each link has a triangular configuration.
3. A method according to Claim 1 or Claim 2 characterized in that the strip of spaced reinforcement members includes an anchorage bar (8) within the block of non-concrete material extending between the links (2).
4. A method according to Claim 3 characterized in that the anchorage bar (8) is welded to the links.
5. A method according to any preceding Claim characterized in that a plurality of the reinforcement members (18) are secured to one another and coupled simultaneously to said lengths of link (2).
EP81300606A 1980-02-15 1981-02-13 Jointing techniques for concrete members Expired EP0034899B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81300606T ATE9110T1 (en) 1980-02-15 1981-02-13 METHOD OF CONNECTING CONCRETE ELEMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8005163 1980-02-15
GB8005163A GB2070094A (en) 1980-02-15 1980-02-15 Jointing techniques for concrete members

Publications (2)

Publication Number Publication Date
EP0034899A1 EP0034899A1 (en) 1981-09-02
EP0034899B1 true EP0034899B1 (en) 1984-08-22

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Application Number Title Priority Date Filing Date
EP81300606A Expired EP0034899B1 (en) 1980-02-15 1981-02-13 Jointing techniques for concrete members

Country Status (4)

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EP (1) EP0034899B1 (en)
AT (1) ATE9110T1 (en)
DE (1) DE3165610D1 (en)
GB (1) GB2070094A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119826A (en) * 1982-04-26 1983-11-23 Square Grip Ltd Reinforcement for concrete joints
NL8303493A (en) * 1982-10-19 1984-05-16 Dow Mac Concrete Ltd FASTENING ASSEMBLY FOR A CONCRETE BODY AND METHOD FOR MAKING THEREOF

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1794684A (en) * 1929-04-23 1931-03-03 Charles E Handel Anchor for veneered concrete structures
US1798134A (en) * 1928-08-23 1931-03-31 Daniel B Danielson Veneer bond
DE2553451A1 (en) * 1975-11-28 1977-06-08 Huebner Handel Huewa Separately formed concrete components reinforcement joint - with anchorages screwed together before second component is concreted
DE2902966A1 (en) * 1979-01-26 1980-07-31 Kurt Mechel CONNECTION BETWEEN TWO SHELL-SHAPED COMPONENTS, e.g. FOR WALLS, FLOORS, CEILINGS OR THE LIKE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2446419A1 (en) * 1974-09-28 1976-04-15 Buescher Pebueso Beton Prefabricated reinforced concrete component production unit - is transportable and has elastic saddle piece with opening for loop-and-anchor component

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798134A (en) * 1928-08-23 1931-03-31 Daniel B Danielson Veneer bond
US1794684A (en) * 1929-04-23 1931-03-03 Charles E Handel Anchor for veneered concrete structures
DE2553451A1 (en) * 1975-11-28 1977-06-08 Huebner Handel Huewa Separately formed concrete components reinforcement joint - with anchorages screwed together before second component is concreted
DE2902966A1 (en) * 1979-01-26 1980-07-31 Kurt Mechel CONNECTION BETWEEN TWO SHELL-SHAPED COMPONENTS, e.g. FOR WALLS, FLOORS, CEILINGS OR THE LIKE

Also Published As

Publication number Publication date
ATE9110T1 (en) 1984-09-15
EP0034899A1 (en) 1981-09-02
DE3165610D1 (en) 1984-09-27
GB2070094A (en) 1981-09-03

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