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WO2023283696A1 - Accessoire pour positionner des boulons d'ancrage coulés sur place, supportant un appareil de pose et procédés associés - Google Patents

Accessoire pour positionner des boulons d'ancrage coulés sur place, supportant un appareil de pose et procédés associés Download PDF

Info

Publication number
WO2023283696A1
WO2023283696A1 PCT/AU2022/050747 AU2022050747W WO2023283696A1 WO 2023283696 A1 WO2023283696 A1 WO 2023283696A1 AU 2022050747 W AU2022050747 W AU 2022050747W WO 2023283696 A1 WO2023283696 A1 WO 2023283696A1
Authority
WO
WIPO (PCT)
Prior art keywords
base
atachment
formwork
concrete
attachment
Prior art date
Application number
PCT/AU2022/050747
Other languages
English (en)
Inventor
Hayden Charles JUREY
Original Assignee
Threadlegs Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2021205114A external-priority patent/AU2021205114A1/en
Priority claimed from AU2021273625A external-priority patent/AU2021273625A1/en
Application filed by Threadlegs Pty Ltd filed Critical Threadlegs Pty Ltd
Publication of WO2023283696A1 publication Critical patent/WO2023283696A1/fr

Links

Classifications

    • 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
    • E04B1/4114—Elements with sockets
    • E04B1/4121—Elements with sockets with internal threads or non-adjustable captive nuts
    • 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
    • E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
    • E04C5/206—Spacers having means to adapt the spacing distance
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/50—Anchored foundations
    • 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
    • E04B2001/4192—Connecting devices specially adapted for embedding in concrete or masonry attached to concrete reinforcing elements, e.g. rods or wires

Definitions

  • the present patent specification relates to an attachment for positioning cast-in place anchor bolts such as hold down bolts (also known via other terms, such as cast-in threaded anchors and rag bolts).
  • the attachment is securable to a base of cast-in threaded rods, and is securable to concrete formwork to fix a position of the rod prior to the pouring of concrete into the formwork.
  • FIG 1 shows threaded anchor bolts 2 cast in a concrete base 4.
  • the anchor bolts enable a steel column 6 to be secured to the concrete base.
  • each anchor bolt 2 ought to be precisely positioned relative to associated concrete formwork and/or reinforcement such that, after the concrete 4 cures, the anchor bolts 2 protrude out from the concrete 4 at locations that enable the anchor bolts 2 to pass through openings formed in a base of the steel column 6.
  • FIG 3 shows what can occur when the anchor bolts 2 are displaced from their intended positions.
  • the four bolts 2' have shifted relative to their intended locations, and as such, one or more of the bolts 2' cannot be received in a corresponding preformed hole in a base of the steel column 6. Instead, structural modifications have been made to the base of the steel column 6 to allow it to be secured via the displaced bolts 2'. It is thus important to ensure the precise positioning of anchor bolts 2 before, during and after the pouring of concrete, so that they are not displaced from their intended positions. Displaced anchor bolts 2' may result in compromised structures that require additional resources, engineering and labour to address, and can pose safety risks.
  • FIG. 2 shows four threaded rods 3 positioned relative to concrete formwork 8 and reinforcement 10.
  • the lower end of each rod 3 is provided with a steel plate 12 sandwiched between an upper nut 14 and a lower nut (not shown).
  • the tip of the lower end of each rod 3 typically extends beyond the lower nut and is exposed to the open air.
  • the lower ends of each rod 3 are suspended above the formwork 8 so that when the concrete slab is poured, the lower end of the rods 3are covered by and completely encased in the concrete slab. This ensures the lower ends of the rods 3 are protected in the concrete slab and not exposed to the elements, whereby corrosion can occur to the rods 3 and connecting reinforcement within the slab.
  • an attachment for positioning a cast-in concrete anchor relative to concrete formwork prior to pouring of concrete therein comprising: an upper body having a threaded opening for securing to a lower end of the anchor; and a base associated with the body and configured for, in use, placement against and securement to formwork so as to fix a position of the anchor relative thereto.
  • the base comprises one or more features configured for alignment with respective indicators provided on the formwork.
  • the features comprise respective indentations formed in the base.
  • the features may assist with alignment of the anchors with markings premarked on the formwork indicating intended anchor installation positions.
  • the attachment further comprises legs extending downwardly from the body, wherein the base is generally ring-shaped and associated with lower ends of the respective legs such that the legs maintain the body at a height above that of the base.
  • the base comprises one or more openings through which fasteners can be driven to secure the attachment to formwork.
  • the openings are disposed at respective quadrants of the base.
  • each feature of the base is associated with a respective opening.
  • the base comprises a wall extending upwardly from an outer perimeter of the base.
  • the wall comprises the one or more features.
  • the features are symmetrically disposed about an outer perimeter of the base.
  • a method of securing a cast-in concrete anchor relative to concrete formwork prior to pouring of concrete therein comprising: securing the attachment according to a first aspect of the present invention to a lower end of the anchor; and fixing the attachment to concrete formwork such that the anchor is spaced from the formwork.
  • the method further comprises: prior to fixing the attachment, marking the formwork to indicate a position that the attachment and/or associated anchor is to be secured; and aligning features of the attachment with the marking.
  • a method of supporting a setdown above concrete reinforcement prior to pouring of concrete comprising: securing the attachment of any one of claims 1 to 10 to a lower end of a threaded anchor provided with a height adjustment means; securing an upper end of the anchor to the setdown such that it rests on the height adjustment means; and adjusting the height adjustment means such that the attachment is positioned on a base underlying the concrete reinforcement and the setdown is positioned at a desired height above the reinforcement.
  • the height adjustment means comprises a nut that is rotatable along the threaded anchor to effect height adjustment of the setdown.
  • Figure l is a front view of a steel column fixed to a concrete base via anchor bolts cast in the concrete base;
  • Figure 2 is a top perspective view of four threaded rods positioned relative to concrete reinforcement, lower ends of each anchor being suspended above concrete formwork;
  • Figure 3 is a side perspective view of a steel column secured to a concrete base via anchor bolts, all of which are displaced from their intended positions;
  • Figure 4 is a front perspective view of an attachment according to embodiments of the present invention.
  • Figure 5 is a top view of the attachment of Figure 4.
  • Figure 6 shows the present attachment supporting setdowns relative to concrete reinforcement
  • Figure 7 shows the present attachment supporting a plate relative to concrete reinforcement
  • Figure 8 is a cross sectional view of an alternative attachment
  • Figure 9 is a cross sectional view of another alternative attachment.
  • Figure 10 is a bottom perspective view of further alternative attachment.
  • FIGS 4 and 5 show an embodiment of the present attachment 18.
  • the attachment 18 is configured to attach to a lower end of a cast-in-place anchor bolt 2.
  • the attachment 18 can then be fixed, for example, to adjacent formwork, thereby fixing a position of the anchor bolt 2 relative to the concrete formwork.
  • the attachment 18 can also be configured to attach to a lower end of threaded rod 3 for the purposes of supporting a setdown above concrete reinforcement prior to pouring of concrete.
  • the attachment 18 may be integrally formed from a material that is not vulnerable to corrosion, such as plastic.
  • the attachment 18 comprises a generally cylindrical, upper body portion 20, having a centrally disposed through hole 22.
  • the hole 22 is threaded, though in other embodiments such as those shown in Figures 8 and 9 it is not.
  • the threaded hole 22 allows the attachment 18 to screw onto a lower end of an anchor bolt 2.
  • the attachment 18 may be formed in different sizes, with different thread configurations and the like to suit the bolt 2 to which it is to be secured.
  • the attachment 18 can be screwed up and down the threaded anchor bolt 2 to adjust a vertical position thereof.
  • This adjustment process can help to vertically level a group of anchor bolts 2.
  • An upper surface 24 of the body 20 is generally flat, thereby allowing the upper surface 24 to be positioned relatively flush against other attachments, such as steel plates 12 and spacers (see Figure 2) and the like.
  • legs 26 Extending downwardly from an exterior of the upper body 20 are four, generally vertical legs 26 with a ribbed configuration.
  • the legs 26 are preferably equispaced around a circumference of the upper body 20.
  • the height and angle of the legs 26, among other parameters, may of course be varied to suit the specific application.
  • the attachment 18 also comprises a base 28 via which the attachment 18 can be fixed to adjacent formwork.
  • the base 28 is substantially continuous, and may be generally symmetrically disposed about the upper body 20 to promote even encapsulation within the poured concrete.
  • the base 28 is generally ring- shaped and extends around and from a base or lower end of each of the four legs 26.
  • the base 28 defines an annular platform that can be placed against and secured to formwork.
  • the base 28 preferably has a generally flat bottom surface upon which the attachment 18 can sit stably and securely on formwork (though another embodiment with a different configured base 28 is later discussed with reference to Figer 10).
  • the legs 26 extend upwardly from the base 28 and maintain the upper body portion 20 at a height above a height of the base 28. This allows a lower end of the threaded anchor bolt 2 to be offset or raised from the formwork to prevent corrosion thereof.
  • the attachment 18 is configured to space or maintain the lower end of the threaded anchor from the formwork by at least 30mm.
  • the base 28 comprises a generally planar ring-shaped surface 30, wherein quadrants thereof are provided with respective openings or holes 32 through which fasteners can be driven to secure the attachment 18 to adjacent formwork.
  • the attachment 18 need not have the holes 32 preformed therein; for example, the quadrants of the base can simply be drilled through during the fastening process.
  • the base 28 comprises bulges proximate each through hole 32 so that the planar surface 30 of the base 28 provides sufficient surface area to receive, for example, a head of the fastener (e.g., the head of a screw or nail).
  • the base 28 may take other forms, such as oblong, square or rectangular for example.
  • a substantially continuous wall 34 extends upwardly from an outer perimeter of the base 28 and helps to strengthen the base 28.
  • the wall 34 is provided with features 36 which can be aligned with indicators on the formwork to help position the attachment 18 and thus the associated anchor bolt 2 at its intended position.
  • the features are depicted as vertically extending indentations or grooves 36 formed in the upwardly extending wall 34 of the base 28.
  • the grooves 36 are disposed symmetrically about the wall 34.
  • a groove 36a is positioned proximate a respective through hole 32.
  • Additional grooves 36b in the wall 34 are formed at positions generally equidistant between adjacent through holes 32.
  • the four grooves 36a align with one another to define an imaginary cross.
  • the four grooves 36b align with one another to define a second imaginary cross, offset from the first-mentioned cross by about 45 degrees.
  • a surveyor or the like may mark, e.g. with a pencil, a cross on the formwork indicating where each attachment 18 and thus anchor bolt 2 is to be positioned.
  • the grooves 36a or 36b of the attachment 18 may thus be easily visually aligned with the marked cross, and thereafter secured to the formwork at the intended position.
  • the present attachment 18 allows the position of a respective anchor bolt 2 to be fixed relative to concrete formwork and/or reinforcement, while still allowing the lower end of the anchor bolt 2 to be held above the formwork upon which the concrete will be poured. As such, after the concrete is poured, the lower end of the anchor bolt 2 will still be encased in the concrete slab and thus remains protected from the elements.
  • the base 28 of the plastic attachment 18 may be exposed to the elements but is advantageously not vulnerable to corrosion.
  • the attachment 318 comprises projections extending downwardly from the base (as in Figure 10), then it would be the projections that are exposed to the elements, which projections also are not vulnerable to corrosion.
  • the depicted attachment 18 is generally open (e.g., the legs 26 are spaced from one another and the base 28 is ring-shaped as opposed to being a closed or solid circular shape) to allow concrete and aggregate to flow within and around the attachment 18 while minimising the formation of air pockets and cavities in the resulting concrete structure.
  • Figure 8 illustrates an alternative attachment 118.
  • like features are shown with reference numerals incremented by 100 and the preceding description of those features are intended to apply.
  • attachment 118 has an upper body portion 120 that is formed with a cavity 122 without an internal thread formed therein.
  • a nut 150 is provided on an underside of the upper body portion 120.
  • a second nut 152 on the upperside of the upper body portion 120 may also be provided.
  • nuts 150, 152 function as per the hole 122 to securing an end of the threaded rod 3.
  • FIG. 9 illustrates a further alternative attachment 218.
  • like features are shown with reference numerals incremented by 200 and the preceding description of those features are intended to apply.
  • attachment 218 has an upper body portion 220 that is formed with a cavity 222 without an internal thread formed therein.
  • the cavity 222 has a lower surface 248 on which an end of the threaded rod 3 will sit.
  • Cavity 222 may be sized so as to be a close fit with an outer diameter of the threaded anchor 2 to position and support the threaded anchor 2 without a threaded engagement. To accommodate threaded rods of different sizes, differently sized inserts may be used in cavity 222.
  • attachment 18 has been described in relation to concrete formwork, the attachment 18 may of course also be used where a sand or earth-based subgrade is used as a base for footings, foundations and ground slabs.
  • FIG. 6 shows timber setdown 38 suspended above reinforcement 10.
  • the setdown 38 is commonly suspended via conventional bar chairs 40.
  • bar chairs 40 are not height adjustable, and so methods for suspending the setdown 38 at different heights is often improvised.
  • the frontmost setdown is suspended via a cut piece of PVC piping 42.
  • the present attachment 18 can be utilised to suspend setdown 38 at the desired height.
  • a threaded rod 3 and nut 14 can be secured to the setdown 38 for support thereof.
  • An attachment 18 can be secured to a base of the rod 3.
  • the nut 14 can be screwed up and down the rod 3 to adjust a height at which the setdown 38 is installed.
  • Figure 7 shows another application in which the present attachment 18 may be utilised.
  • a steel column 6 is to be mounted on a steel plate 44 suspended above concrete reinforcement 10.
  • the attachments 18 can be secured to a lower ends of the legs and be rotated thereabout to allow for vertical adjustment of the plate 44.
  • FIG. 10 illustrates a further alternative attachment 318.
  • like features are shown with reference numerals incremented by 300 and the preceding description of those features are intended to apply.
  • an underside of the base 328 is provided with one or more downwardly extending projections 354 configured to press against the formwork when installed, allowing concrete to pass between the projections 354 and the base 328 so that when formwork is stripped away, the base 328, or a substantial portion thereof, is not visible and/or exposed.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

L'invention concerne un accessoire pour positionner un boulon d'ancrage coulé sur place par rapport au coffrage de béton avant le versement du béton à l'intérieur de celui-ci, comprenant : un corps supérieur ayant une ouverture pour recevoir et supporter une extrémité inférieure du boulon de telle sorte qu'il est espacé du coffrage ; des pattes s'étendant vers le bas à partir du corps supérieur ; et une base sensiblement continue conçue pour, lors de l'utilisation, placer contre et fixer au coffrage de façon à fixer une position du boulon par rapport à celui-ci, la base étant associée à des extrémités inférieures respectives des pattes de façon à maintenir le corps supérieur au-dessus de celui-ci.
PCT/AU2022/050747 2021-07-16 2022-07-15 Accessoire pour positionner des boulons d'ancrage coulés sur place, supportant un appareil de pose et procédés associés WO2023283696A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2021205114 2021-07-16
AU2021205114A AU2021205114A1 (en) 2021-07-16 2021-07-16 Attachment for positioning cast-in concrete anchors
AU2021273625 2021-11-25
AU2021273625A AU2021273625A1 (en) 2021-11-25 2021-11-25 Attachment for positioning cast-in concrete anchors

Publications (1)

Publication Number Publication Date
WO2023283696A1 true WO2023283696A1 (fr) 2023-01-19

Family

ID=84918789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2022/050747 WO2023283696A1 (fr) 2021-07-16 2022-07-15 Accessoire pour positionner des boulons d'ancrage coulés sur place, supportant un appareil de pose et procédés associés

Country Status (1)

Country Link
WO (1) WO2023283696A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000591A (en) * 1975-08-04 1977-01-04 Superior Concrete Accessories, Inc. Holder adapted for supporting an anchor insert to be embedded in a concrete slab
WO2012129177A1 (fr) * 2011-03-18 2012-09-27 Espinosa Thomas M Ensemble d'accouplement pour ancrage à béton et support de tige d'ancrage
US20140000212A1 (en) * 2011-07-29 2014-01-02 Simpson Strong-Tie Company, Inc. Anchor Bolt Locator
WO2014018529A1 (fr) * 2012-07-24 2014-01-30 Espinosa Thomas M Support pour ancrages de béton
WO2014025760A2 (fr) * 2012-08-06 2014-02-13 Espinosa Thomas M Ensembles support et ancre à béton
US10577816B1 (en) * 2016-02-18 2020-03-03 Cetres Holdings, Llc Holder for supporting an anchor rod and anchor body

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000591A (en) * 1975-08-04 1977-01-04 Superior Concrete Accessories, Inc. Holder adapted for supporting an anchor insert to be embedded in a concrete slab
WO2012129177A1 (fr) * 2011-03-18 2012-09-27 Espinosa Thomas M Ensemble d'accouplement pour ancrage à béton et support de tige d'ancrage
US20140000212A1 (en) * 2011-07-29 2014-01-02 Simpson Strong-Tie Company, Inc. Anchor Bolt Locator
WO2014018529A1 (fr) * 2012-07-24 2014-01-30 Espinosa Thomas M Support pour ancrages de béton
WO2014025760A2 (fr) * 2012-08-06 2014-02-13 Espinosa Thomas M Ensembles support et ancre à béton
US10577816B1 (en) * 2016-02-18 2020-03-03 Cetres Holdings, Llc Holder for supporting an anchor rod and anchor body

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