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WO2000045008A1 - Formeur de cage d'armature et collier de serrage a utiliser avec ladite cage - Google Patents

Formeur de cage d'armature et collier de serrage a utiliser avec ladite cage Download PDF

Info

Publication number
WO2000045008A1
WO2000045008A1 PCT/IB2000/000072 IB0000072W WO0045008A1 WO 2000045008 A1 WO2000045008 A1 WO 2000045008A1 IB 0000072 W IB0000072 W IB 0000072W WO 0045008 A1 WO0045008 A1 WO 0045008A1
Authority
WO
WIPO (PCT)
Prior art keywords
cage
frame
bolt
former according
former
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.)
Ceased
Application number
PCT/IB2000/000072
Other languages
English (en)
Inventor
Stephen Render
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.)
ROM Ltd
Original Assignee
ROM 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 ROM Ltd filed Critical ROM Ltd
Priority to AU23125/00A priority Critical patent/AU2312500A/en
Priority to DE60027150T priority patent/DE60027150D1/de
Priority to EP00901826A priority patent/EP1179106B1/fr
Publication of WO2000045008A1 publication Critical patent/WO2000045008A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
    • B21F27/121—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
    • E04C5/0618—Closed cages with spiral- or coil-shaped stirrup rod
    • 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
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/166—Connectors or means for connecting parts for reinforcements the reinforcements running in different directions
    • E04C5/167—Connection by means of clips or other resilient elements

Definitions

  • This invention relates to a cage former and clamp therefor, and in particular to a cage former for use in assembling and maintaining a pile cage for a reinforced concrete pile.
  • Reinforced concrete piles are -known for use in the foundations of roadway bridges and the like.
  • the piles are sunk deep into the ground and can for example provide a link between the bridge supports and the underlying rocks.
  • the cage acts both as a reinforcement for the concrete and also as a means to tie the bridge support or the like to the pile. To achieve the latter purpose, it is common-place for the cage bars to project beyond the end or top of the pile.
  • cover zone In order to maintain the integrity of the pile it is necessary to ensure that the metal cage bars (and also the metal of the frames or interconnecting wire) do not encroach too near the surface of the concrete, and it is recognised that a "cover zone" is required within which either no metal, or only metal which is protected against corrosion, should be present.
  • the cover zone will typically comprise a layer several centimeters thick adjacent the surface of the concrete. Should unprotected metal encroach into the cover zone there is a risk that over time water and other agents will contact the metal and cause it to corrode, eventually breaking down parts of the pile. It is usually uneconomic to manufacture the whole pile cage from protected metal such as stainless steel or otherwise corrosion resistant metal, and so the manufacturers of piles and pile cages therefore seek to ensure that any metal which is present in the cover zone is protected, usually by a plastic coating or sheathing.
  • a rigid structure comprising one or more polygonal or substantially circular frames to which the cage bars can be secured, the rigid structure being referred to herein as a cage former. It is known to affix cage formers at predetermined locations along the length of the cage, and to use these in combination with a helical interconnecting wire.
  • European patent application 0 608 068 discloses a cage former having two frames which are joined rigidly together by a number of outwardly-flared rods.
  • This cage former can serve to interconnect and locate the cage bars relative to one another.
  • the cage former also has integral spacer means to ensure that the assembled cage is kept out of the cover zone, the spacer means being provided by the outwardly flared portions of the rods interconnecting the two frames, each of which carries a plastic sleeve.
  • the cage must usually be lifted in order to move it about the site, and also to lower it into the prepared hole. Since an assembled cage can be of considerable weight, the wire ties are not always sufficiently strong to provide lifting points for the cage. Thus, to lift the cage it is necessary to affix a line or cable to the cage, typically to a pair of junctions of a particular cage former and the corresponding cage bars. If the chosen junctions are maintained only by a wire tie they will usually be unable to support the weight of the cage, and the cage bars will be forced to slide relative to the cage former, and vice versa, so that the structural integrity of the cage is lost.
  • an assembled pile cage comprises a matrix of longitudinal cage bars and transverse frames (and a helical wire), and access through a gap in the matrix to tighten a nut upon the U-bolt can be very awkward and may not always be achieved satisfactorily, resulting in a junction which cannot support the weight of the cage when this is lifted.
  • a third disadvantage of such an arrangement is that the U-bolts are supplied separately from the remainder of the cage components, and perhaps from a different supplier; the failure of the U-bolt supplier to deliver the U-bolts in time, or the loss of those U-bolts on site, will result in a delay to the pile construction.
  • GB patent application 2,310,875 discloses a cage former having two frames which are rigidly joined together. Two clamps, such as scaffolding clamps, are secured to the inside surface of one of the frames. Accordingly, this cage former overcomes the third disadvantage mentioned above in that the clamp is supplied with and secured to the cage former.
  • the clamps are secured to the frame and have a pivotable flap which can surround the cage bar and secure this to the frame by way of a tightenable bolt.
  • the separation of the cage bars on opposite sides of the cage should ideally be maximised, since this provides the maximum lever arm and so the maximum transverse loading which the cage and thus the assembled pile can withstand.
  • the designer of the pile will usually design the cage to meet its specification when all of the cage bars lie within but in engagement with the frame(s), and the reduced separation of opposed cage bars at one or more locations along the length of the cage might reduce the cage's ability to withstand transverse loading.
  • clamps are usually only required at certain positions along the length of the cage, the number of clamping positions being determined by the size of the cage. Only a single clamping position (providing two opposed lifting points) may be required for a small cage, for example. Away from this position (or these positions, as applicable) the cage bars will be secured to the frame(s) and helical wire by wire ties. It is thus necessary for the cage bars which are clamped to bend to accommodate the fact that for the majority of their length they are at the specified position (in contact with the frame and/or helical wire), but at the particular position or positions are forced to deviate towards the centre of the cage by as much as 15 mm. This can of course make it difficult effectively to tie the cage bar to the frames or helical wire close to the clamps, so that the structural integrity of the cage might be impaired.
  • the cage bars which engage the clamps will converge towards the end of the cage, i.e. there is no facility to force them to diverge back towards the specified position; if the cage bars extend beyond the end of the cage, for example for securement to a bridge support or the like, then the convergence of certain of the cage bars can be a significant disadvantage.
  • a cage former including a frame and a clamping means for clamping a cage bar to the frame, characterised in that the clamping means lies ⁇ o the side of the frame.
  • the clamping means lies to the side of the frame no part of it lies between the frame and the cage bar in use, so that the cage bar can engage the frame and is not forced to deviate away from its specified position.
  • the transverse loading which the assembled pile can withstand is not articifically reduced from its design loading.
  • the clamping means lies outside the plane and outside the enclosed volume of the frame .
  • the separation between the cage bars secured to the clamps is maintained as specified.
  • the clamping means comprises a body, a flap, a bolt and a nut.
  • the flap is pivotably connected to the body.
  • the flap has an aperture through which a part of the bolt can pass, the head of the bolt being retained by the flap.
  • the body has a bifurcated section which can receive the free end of the bolt and against which the nut can be tightened to reduce the area enclosed by the clamping means, and in use to clamp a cage bar to the frame.
  • the body of the clamp is secured to the side of the frame, as by welding.
  • the flap retaining the head of the bolt With the body secured to the frame, and the flap retaining the head of the bolt, it can be arranged that in the assembled cage the free end of the bolt projects towards the outside of the cage.
  • the nut can be applied to the bolt and tightened thereon from outside the cage, without requiring access to the inside of the cage.
  • the arm preferably surrounds a smaller sector of the cage bar than does the body.
  • the bolt is angled at a acute angle to the radius of the cage and neither the nut nor the free end of the bolt will enter the cover zone, even when the nut is fully tightened.
  • the inventor has therefore realised that placing the clamp alongside the frame allows considerable design freedom in the positioning of the bolt and nut, so that these components can be positioned to provide maximum ease of tightening whilst ensuring that no metal enters the cover zone.
  • one or more support members which can overlie a part of the frame for the purpose of adding rigidity to the assembled frame and clamping means.
  • Part of the support means may overlie a part of the inside surface of the frame (i.e. lie within the enclosed volume of a substantially planar frame), but this is of no detriment since the support means will not lie between the frame and the cage bar in use.
  • the body and/or flap are of curved or substantially circular cross-section.
  • the cage bars are typically of a construction known as reinforcing bar, in which the surface is “roughened” by way of raised longitudinal and transverse ribs.
  • the provision of a curved or substantially circular body and/or flap permits the parts of the clamp which engage the cage bar to lie between adjacent ribs, and in particular to lie between adjacent transverse ribs, so increasing the effectiveness of the clamp thereon.
  • Fig.l is a plan view of a cage former according to the invention.
  • Fig.2 is a view of part of the frame, and the body of the clamping means having two support members connected thereto;
  • Fig.4 is a sectional view along the lines IV-IV of Fig.2.
  • the cage former can comprise two (or perhaps more) substantially planar frames interconnected by linear rods, or by outwardly-flared rods which carry plastic-sleeves such as those of European patent application 0 608 068.
  • the latter of these embodiments would also serve to locate the assembled cage within the pile.
  • the fiame could also be of non-planar form, e.g helical.
  • many if not all of the available designs of cage former could similarly be utilised with the present invention, or readily be adapted to be utilised with the present invention, if desired.
  • the cage former 10 is designed for use on a relatively small cage having four cage bars 18, as shown in dotted outline in Fig.l.
  • Two of the cage bars 18a and 18c are securely clamped to the frame 12 by clamps 14, as described in more detail below.
  • the other two cage bars 18b, 18d lie alongside the locator bars 16, which bars comprise substantially linear rods to which the cage bars 18a,b are respectively tied by wire ties in known fashion.
  • the locator bars are welded to the frame 12 at 20.
  • clamps 14 ar ⁇ typically used with a cage, the lifting load being directed to the left or right as drawn in Fig.l, so that the load is shared substantially equally between the clamps 14.
  • the clamps 14 are designed to provide a secure junction between the frame 12 and the cage bars 18a, c, which junctions can act as lifting points for the assembled cage.
  • the frame 12 comprises a length of bar bent into a number of overlying rings 28 (Figs.2,4).
  • the frame comprises at least two complete rings 28, the rings being welded together at spaced locations 22 (Fig.2).
  • One end 24 of the bar can be seen in Fig.l; the other end 26 is shown in dotted outline only. It will be understood that for the small region of overlap of the ends 24,26 the frame 12 comprises three adjacent rings, whilst for the remainder the frame comprises two adjacent rings.
  • single-ring frames in which the ends overlap or abut, or frames with three or more complete rings can be used, as desired.
  • the frame 12 is substantially circular in plan view, this is not necessary, i.e. a square or substantially square frame could be used with the four cage bars 18 shown.
  • the frame or frames may instead be polygonal to conform closely to the outer periphery of the cage.
  • the clamps 14 each comprise a body 30, ⁇ flap 32, a bolt 34 and a nut 36.
  • the body 30 is secured to the side 40 of the frame 12 (rather than to its inside surface 42 as in the prior art document GB 2,310,875).
  • the cage bars 18a, c can lie against the frame 12 (see Figs. 1 and 4), as do the bars 18b, d, so that the cage bars 18a, c are separated by the maximum distance permitted by the fr ⁇ : « ⁇ e 12 (i.e. as the designer intended), and by substantially the same distance as the bars 18b,d.
  • the body 30 is welded to the frame 12 along the joint line 44 - the line of welding is not shown in Fig.2, but is shown at 46 in Fig.4. In addition, these components are welded together along the joint line facing towards the outside of the frame, i.e. the underside of the paper in Fig.2 - weld line 48 in Fig.4. The body 30 is therefore securely connected to the frame 12, the connection being designed to be sufficient to carry the weight of the entire cage if this is necessary or desired.
  • each of the clamps 14 connected to the body of each of the clamps 14 are two support members 50, which comprise lugs adapted to engage and overlie a part of the surface 42 of the frame. Notwithstanding that these parts lie within the enclosed volume of the frame 12 they are spaced away from the part of the surface 42 which is engaged by the cage bar 18 in use, i.e. in use the lugs 50 lie to either side of the clamped cage bar 18.
  • the cage bar 18 can lie against the lugs 50 in use, if this is desired.
  • Fig.4 shows that the weld line 46 continues around the support lugs 50.
  • the welding between the clamp body 30 and the frame 12 is spread over a larger area, and in particular does not lie in a single plane; accordingly, the clamp 14 is particularly secure, and is not likely, to become separated from the frame 12 during rough handling of the cage former or cage on site, for example.
  • the lugs 50 do not take part in the clamping function, and so are not considered to be a part of the clamping means itself; however, the lugs 50 are beneficial in increasing the strength of the connection between the clamp body 30 and the frame 12, so increasing the load wliich the cage former 10 can support in use.
  • the flap 32 is pivotably secured to the body 30 by way of a pivot pin 52, the pivot pin 52 passing through apertures in the bifurcated arms 54 at the end 56 of the flap 32 (Fig.3) as well as aperture 58 adjacent the end 60 of the body 30 (Fig.2). It is desirable that the flap be permanently retained in connection with the body, so that the flap does not become lost in transit or on site. However, in alternative embodiments it is possible that the flap could be secured to the body by a removable pin or nut and bolt assembly, for example.
  • the body carries the bifurcated arms, and the flap has a flattened end adapted to lie between the bifurcated arms, the flattened end and bifurcated arms being apertured to receive a pivot pin or the like; such an alternative embodiment reverses the constructions of the ends 56 and 60.
  • the end 70 of the body 30 has a pair of bifurcated arms 72 which can receive therebetween the shank of the bolt 34.
  • the nut 36 when secured to the shank of the bolt 34, can be tightened against the surface of the arms 72 so as to reduce the area enclosed by the body, flap and bolt, and clamp a cage bar 18 located therewithin.
  • the arms 72 terminate in a raised lip 74 which is adapted to prevent the nut sliding out from between the arms 72.
  • the provision of bifurcated arms 72 allows the clamp to be provided complete, i.e.
  • the user merely having to swing the flap 32 around the cage bar 18, and swing the bolt 34 so that the shank enters between the arms 72.
  • the extreme end of the threads of the shank of the bolt 34 might be deformed so as to prevent the inadvertent removal of the nut therefrom, which serves to ensure that all of the components of the clamp are maintained together until required.
  • the surface 80 of the body 30 is flush with the surface 42 of the frame 12; it is therefore intended that in this embodiment the rings 28 will also lie between the ribs of the cage bar 18. If, however, it is found that the particular arrangement and sizes of the rings 28, and the particular size and spacing of the ribs on the cage bar 18 will cause the ribs of the cage bar 18 to lie upon the surface 42, then the body 30 can be secured to the frame so that its surface 80 stands proud of the surface 42 by a distance substantially equal to the height of the ribs (perhaps by as much as 3 mm), ensuring that the surface 80 can engage the cage bar directly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un formeur de cage d'armature et un collier de serrage à utiliser avec ladite cage, et notamment un formeur de cage à utiliser dans l'assemblage et la fixation d'une cage de pilier pour pilier en béton armé. Par ailleurs, l'invention porte sur un formeur de cage (10) comportant un cadre (12) et un moyen de fixation (14) pour fixer une barre de cage (18) au cadre, le moyen de fixation reposant sur le côté du cadre. Un collier de serrage à utiliser avec ledit formeur de cage est également prévu.
PCT/IB2000/000072 1999-01-27 2000-01-26 Formeur de cage d'armature et collier de serrage a utiliser avec ladite cage Ceased WO2000045008A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU23125/00A AU2312500A (en) 1999-01-27 2000-01-26 Cage former and clamp therefor
DE60027150T DE60027150D1 (de) 1999-01-27 2000-01-26 Element um einen betonverstärkungskäfig zu bilden und klemmhalter dafür
EP00901826A EP1179106B1 (fr) 1999-01-27 2000-01-26 Formeur de cage d'armature et collier de serrage a utiliser avec ladite cage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9901746.9 1999-01-27
GBGB9901746.9A GB9901746D0 (en) 1999-01-27 1999-01-27 Cage former and clamp therefor

Publications (1)

Publication Number Publication Date
WO2000045008A1 true WO2000045008A1 (fr) 2000-08-03

Family

ID=10846556

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/000072 Ceased WO2000045008A1 (fr) 1999-01-27 2000-01-26 Formeur de cage d'armature et collier de serrage a utiliser avec ladite cage

Country Status (5)

Country Link
EP (1) EP1179106B1 (fr)
AU (1) AU2312500A (fr)
DE (1) DE60027150D1 (fr)
GB (1) GB9901746D0 (fr)
WO (1) WO2000045008A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064906A1 (fr) * 2001-02-09 2002-08-22 Cagemaker Equipment Pty Ltd Forme associee a un dispositif de production de cages d'armature
AU2002229408B2 (en) * 2001-02-09 2005-06-30 Cagemaker Equipment Pty Ltd A former associated with an apparatus for making cages
WO2008033991A3 (fr) * 2006-09-14 2008-07-31 Gloria Marie Buley guide de renforcement de béton et procédé de fabrication de guide de renforcement de béton
GB2547283A (en) * 2016-02-15 2017-08-16 Render Stephen Device for splicing reinforcement cages
CN112275964A (zh) * 2020-11-04 2021-01-29 重庆建工市政交通工程有限责任公司 钢筋间距定位器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9812596D0 (en) 1998-06-11 1998-08-12 Amersham Pharm Biotech Uk Ltd Energy transfer assay method
CN111364688B (zh) * 2020-04-13 2021-02-12 中建二局第二建筑工程有限公司 一种建筑施工钢筋定位结构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377928A (en) * 1980-01-09 1983-03-29 Landshuter Baueisenbiegerei Gmbh Reinforcement basket for reinforced-concrete column
US4388791A (en) * 1980-04-28 1983-06-21 Anderson Frank H Rebar tie
US4463538A (en) * 1982-01-21 1984-08-07 Dragunas Alfred R Reinforcing network for concrete structure
EP0608068A1 (fr) 1993-01-16 1994-07-27 Gray Engineering Limited Cage d'armature d'un pieu en béton
GB2310875A (en) 1996-03-09 1997-09-10 Gray Eng Ltd Support structure for cage for reinforcing a concrete pile
EP0881337A1 (fr) * 1997-05-30 1998-12-02 Gray Engineering Limited Fixation des barres d'armature

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377928A (en) * 1980-01-09 1983-03-29 Landshuter Baueisenbiegerei Gmbh Reinforcement basket for reinforced-concrete column
US4388791A (en) * 1980-04-28 1983-06-21 Anderson Frank H Rebar tie
US4463538A (en) * 1982-01-21 1984-08-07 Dragunas Alfred R Reinforcing network for concrete structure
EP0608068A1 (fr) 1993-01-16 1994-07-27 Gray Engineering Limited Cage d'armature d'un pieu en béton
GB2310875A (en) 1996-03-09 1997-09-10 Gray Eng Ltd Support structure for cage for reinforcing a concrete pile
EP0881337A1 (fr) * 1997-05-30 1998-12-02 Gray Engineering Limited Fixation des barres d'armature

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064906A1 (fr) * 2001-02-09 2002-08-22 Cagemaker Equipment Pty Ltd Forme associee a un dispositif de production de cages d'armature
AU2002229408B2 (en) * 2001-02-09 2005-06-30 Cagemaker Equipment Pty Ltd A former associated with an apparatus for making cages
US7124785B2 (en) 2001-02-09 2006-10-24 Cagemaker Equipment Pty. Ltd. Former associated with an apparatus for making cages
WO2008033991A3 (fr) * 2006-09-14 2008-07-31 Gloria Marie Buley guide de renforcement de béton et procédé de fabrication de guide de renforcement de béton
GB2547283A (en) * 2016-02-15 2017-08-16 Render Stephen Device for splicing reinforcement cages
GB2547283B (en) * 2016-02-15 2021-02-10 Render Stephen Device for splicing reinforcement cages
CN112275964A (zh) * 2020-11-04 2021-01-29 重庆建工市政交通工程有限责任公司 钢筋间距定位器

Also Published As

Publication number Publication date
EP1179106A1 (fr) 2002-02-13
EP1179106B1 (fr) 2006-04-05
DE60027150D1 (de) 2006-05-18
GB9901746D0 (en) 1999-03-17
AU2312500A (en) 2000-08-18

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