EP0608068B1 - Support structure for producing a cage for reinforcing a concrete pile - Google Patents

Support structure for producing a cage for reinforcing a concrete pile Download PDF

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Publication number
EP0608068B1
EP0608068B1 EP19940300209 EP94300209A EP0608068B1 EP 0608068 B1 EP0608068 B1 EP 0608068B1 EP 19940300209 EP19940300209 EP 19940300209 EP 94300209 A EP94300209 A EP 94300209A EP 0608068 B1 EP0608068 B1 EP 0608068B1
Authority
EP
European Patent Office
Prior art keywords
cage
support structure
guide portions
frames
rods
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 - Lifetime
Application number
EP19940300209
Other languages
German (de)
French (fr)
Other versions
EP0608068A1 (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.)
Gray Engineering Ltd
Original Assignee
Gray Engineering 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
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Application filed by Gray Engineering Ltd filed Critical Gray Engineering Ltd
Publication of EP0608068A1 publication Critical patent/EP0608068A1/en
Application granted granted Critical
Publication of EP0608068B1 publication Critical patent/EP0608068B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/20Auxiliary 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
    • E04C5/208Spacers especially adapted for cylindrical reinforcing cages
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0604Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/168Spacers connecting parts for reinforcements and spacing the reinforcements from the form

Definitions

  • the present invention relates to support structure for producing a cage for reinforcing a concrete pile.
  • a cage by first producing support structures which comprise transverse frames, that may be formed by a rod bent into a circle or a polygon, and longitudinal rods that are secured to the frames to keep the frames at the correct distance apart and in planes that are correctly inclined relative to the longitudinal axis of the cage.
  • support structures which comprise transverse frames, that may be formed by a rod bent into a circle or a polygon, and longitudinal rods that are secured to the frames to keep the frames at the correct distance apart and in planes that are correctly inclined relative to the longitudinal axis of the cage.
  • two or more such support structures are placed in line with one another and the longitudinal cage bars are positioned on the frames and secured to the support structures.
  • spacer wheels has certain associated disadvantages.
  • they because of the cost of the spacer wheels and the labour involved in mounting them on the cage, they add considerably to the expense. Furthermore, they can be dislodged while the cage is being lowered into the bore, for example if they meet an obstruction or if they received a knock during rough handling of the cage. If this should occur, there is no way of knowing that they have come away and this may lead to cage misalignment.
  • a still further problem is that they can interfere with the flow of concrete in the bore.
  • the invention therefore seeks to provide a support structure that can enables a cage to be constructed in such a manner that its correct alignment in a concrete pile can be ensured without the need for plastics spacer wheels.
  • the support structure for use in the production of a cage for reinforcing a concrete pile to maintain a plurality of bars extending in the longitudinal direction of the cage in spaced relation to one another
  • the support structure comprising at least spaced apart superimposed two transverse frames secured when in use to the longitudinally extending bars of the cage and a plurality of metal rods secured to and longitudinally extending between the transverse frames, at least three of the rods extending between the frames have radially outwardly offset guide portions that lie outside the volume bounded by the frames and that are rendered corrosion resistant.
  • the guide portions may be made corrosion resistant by being covered with a suitable coating, e.g. a plastics material, or by being treated against corrosion, e.g. by galvanising.
  • the metal rods are preferably evenly distributed about the circumference of the transverse frames, the optimum number of rods being dependent upon the size of the frames.
  • Figure 1 shows a support structure 10 formed of two circular frames or rings 12, 14 connected to one another by four longitudinal metal rods 16.
  • the frames 12, 14 need not be circular and the number of metal rods may be three or more.
  • Each of the metal rods 16 has a radially outwardly offset guide portion 18 that lies outside the volume bounded by the frames 12, 14.
  • the guide portions 18 are covered with a plastics material 20 which may be preformed plastics sleeves fitted over the metal rods prior to their being bent to form the cranked guide portions. Instead of a coating, these guide portions 18 may be galvanised to withstand corrosion.
  • Figure 4 shows an alternative form of sleeve 20' having a flat outer surface, defined by flanges 20a and 20b that extend laterally from both sides of the sleeve.
  • Figure 2 shows a complete cage formed of two support structures 10 arranged at opposite ends of the cage.
  • Four bars 24 are secured to the support structures 10 and pass inside the frames 12 and 14.
  • the plastics covered guide portions 18 lie outside the volume bounded by the cage bars 24 and act to guide the cage as it is being lowered into a bore and to centre the cage within the bore.
  • These guide portions therefore act in place of spacer wheels but offer the considerable advantage of being integral with the cage so that they cannot be dislodged while the cage is being lowered into a bore.
  • the cost of a cage incorporating such guide portions is less than a cage fitted with spacer wheels, there being both material and labour savings to be achieved by the construction of the invention.
  • a cage constructed using the support structures of the invention is also found to meet less resistance and to require less effort when it is driven into wet concrete.
  • the guide portions are used for centring the cage, there need only be three. In larger cages, on the other hand, it may be desirable to use more than four.
  • the rods are also used to locate the cage bars, it is advantageous, though not essential to provide as many rods as there are main bars in the cage.
  • the number of offset guide portions is determined in part by the size of the cage and in part by the hardness of the soil. Larger cages require more guiding and the same applies to soft soil.
  • rods of the support structure it is also not essential for all the rods of the support structure to include offset guide portions. Thus a large cage may require several rods for strength but only require a lesser number of guide portions in view of the soil. Furthermore, when some of the rods are left straight, the strength of the support structure is improved in that it can better withstand axial forces, without the bent rods being deformed from their desired shape.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Reinforcement Elements For Buildings (AREA)

Description

    Field of the invention
  • The present invention relates to support structure for producing a cage for reinforcing a concrete pile.
  • Background of the invention
  • It is known to use, for the purpose of reinforcing a concrete pile, a cage having longitudinally extending bars arranged at the corners of a polygon and secured to transverse rods. These transverse rods act to keep the longitudinal bars apart and to add structural strength to the cage.
  • It is important that the cage should be correctly located within the concrete so that an adequate thickness of concrete should surround all parts of the cage. In order to achieve this aim, it is usual to place plastics spacer wheels on the transverse rods of the cage. These spacers are split wheels that can be pushed onto the transverse rods and they are intended to roll on the walls of the bore into which the cage is lowered to centre the cage within the bore.
  • It is also known, for example from GB-A-2,235,223, to form a cage by first producing support structures which comprise transverse frames, that may be formed by a rod bent into a circle or a polygon, and longitudinal rods that are secured to the frames to keep the frames at the correct distance apart and in planes that are correctly inclined relative to the longitudinal axis of the cage. To form a cage, two or more such support structures are placed in line with one another and the longitudinal cage bars are positioned on the frames and secured to the support structures.
  • The use of spacer wheels has certain associated disadvantages. In particular, because of the cost of the spacer wheels and the labour involved in mounting them on the cage, they add considerably to the expense. Furthermore, they can be dislodged while the cage is being lowered into the bore, for example if they meet an obstruction or if they received a knock during rough handling of the cage. If this should occur, there is no way of knowing that they have come away and this may lead to cage misalignment. A still further problem is that they can interfere with the flow of concrete in the bore.
  • Object of the invention
  • The invention therefore seeks to provide a support structure that can enables a cage to be constructed in such a manner that its correct alignment in a concrete pile can be ensured without the need for plastics spacer wheels.
  • Summary of the invention
  • According to the present invention, in a support structure for use in the production of a cage for reinforcing a concrete pile to maintain a plurality of bars extending in the longitudinal direction of the cage in spaced relation to one another, the support structure comprising at least spaced apart superimposed two transverse frames secured when in use to the longitudinally extending bars of the cage and a plurality of metal rods secured to and longitudinally extending between the transverse frames, at least three of the rods extending between the frames have radially outwardly offset guide portions that lie outside the volume bounded by the frames and that are rendered corrosion resistant.
  • The guide portions may be made corrosion resistant by being covered with a suitable coating, e.g. a plastics material, or by being treated against corrosion, e.g. by galvanising.
  • The metal rods are preferably evenly distributed about the circumference of the transverse frames, the optimum number of rods being dependent upon the size of the frames.
  • Brief description of the drawings
  • The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
    • Figure 1 is a side view of a support structure for use in producing a cage,
    • Figure 2 is a side view of a cage produced using two support structures as shown in Figure 1,
    • Figure 3 is an end view of the cage shown in Figure 2, and
    • Figure 4 is a section through an alternative form of plastics sleeve fitted over the guide portions of the metal rods in a further embodiment of the invention.
    Detailed description of the drawings
  • Figure 1 shows a support structure 10 formed of two circular frames or rings 12, 14 connected to one another by four longitudinal metal rods 16. The frames 12, 14 need not be circular and the number of metal rods may be three or more.
  • Each of the metal rods 16 has a radially outwardly offset guide portion 18 that lies outside the volume bounded by the frames 12, 14. The guide portions 18 are covered with a plastics material 20 which may be preformed plastics sleeves fitted over the metal rods prior to their being bent to form the cranked guide portions. Instead of a coating, these guide portions 18 may be galvanised to withstand corrosion.
  • Figure 4 shows an alternative form of sleeve 20' having a flat outer surface, defined by flanges 20a and 20b that extend laterally from both sides of the sleeve.
  • Figure 2 shows a complete cage formed of two support structures 10 arranged at opposite ends of the cage. Four bars 24 are secured to the support structures 10 and pass inside the frames 12 and 14.
  • In the finished cage, the plastics covered guide portions 18 lie outside the volume bounded by the cage bars 24 and act to guide the cage as it is being lowered into a bore and to centre the cage within the bore. These guide portions therefore act in place of spacer wheels but offer the considerable advantage of being integral with the cage so that they cannot be dislodged while the cage is being lowered into a bore. Furthermore, the cost of a cage incorporating such guide portions is less than a cage fitted with spacer wheels, there being both material and labour savings to be achieved by the construction of the invention. A cage constructed using the support structures of the invention is also found to meet less resistance and to require less effort when it is driven into wet concrete.
  • The above description of a preferred embodiment is given only by way of non-limiting example and various modifications may be made without departing from the scope of the invention as set out in the appended claims.
  • For example, as the guide portions are used for centring the cage, there need only be three. In larger cages, on the other hand, it may be desirable to use more than four. In practice, as the rods are also used to locate the cage bars, it is advantageous, though not essential to provide as many rods as there are main bars in the cage. The number of offset guide portions is determined in part by the size of the cage and in part by the hardness of the soil. Larger cages require more guiding and the same applies to soft soil.
  • It is also not essential for all the rods of the support structure to include offset guide portions. Thus a large cage may require several rods for strength but only require a lesser number of guide portions in view of the soil. Furthermore, when some of the rods are left straight, the strength of the support structure is improved in that it can better withstand axial forces, without the bent rods being deformed from their desired shape.
  • It will also be clear that when making longer cages, more than two support structures may be needed along the length of the cage.

Claims (7)

  1. A support structure for use in the production of a cage for reinforcing a concrete pile to maintain a plurality of bars (24) extending in the longitudinal direction of the cage in spaced relation to one another, the support structure comprising at least two spaced apart superimposed transverse frames (12,14) secured when in use to the longitudinally extending bars (24) of the cage and a plurality of metal rods (16) secured to and longitudinally extending between the transverse frames (12,14), wherein at least three of the rods (16) extending between the frames (12,14) have radially outwardly offset guide portions (18) that lie outside the volume bounded by the frames and that are rendered corrosion resistant.
  2. A support structure as claimed in claim 1, wherein the guide portions are rendered corrosion resistant by being covered with a suitable coating.
  3. A support structure as claimed in claim 2, wherein the coating on the guide portions is of a plastics material, being formed as plastics sleeves fitted over the rods.
  4. A support structure as claimed in claim 3, wherein the plastics sleeves have flat outer surfaces defined by flanges (20a, 20b) extending laterally from both sides of a cylindrical tube (20').
  5. A support structure as claimed in claim 1, wherein the guide portions are galvanised or otherwise treated against corrosion.
  6. A support structure as claimed in any preceding claim, wherein the metal rods (16) are evenly distributed about the circumference of the transverse frames (12,14).
  7. A cage comprising a plurality of longitudinal bars secured to two or more support structures as claimed in any preceding claim.
EP19940300209 1993-01-16 1994-01-12 Support structure for producing a cage for reinforcing a concrete pile Expired - Lifetime EP0608068B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9300995A GB2274299A (en) 1993-01-16 1993-01-16 Cage for reinforcing a concrete pile
GB9300995 1993-01-16

Publications (2)

Publication Number Publication Date
EP0608068A1 EP0608068A1 (en) 1994-07-27
EP0608068B1 true EP0608068B1 (en) 1997-09-03

Family

ID=10728945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940300209 Expired - Lifetime EP0608068B1 (en) 1993-01-16 1994-01-12 Support structure for producing a cage for reinforcing a concrete pile

Country Status (3)

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EP (1) EP0608068B1 (en)
DE (1) DE69405255T2 (en)
GB (1) GB2274299A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2303648B (en) * 1995-07-25 1999-01-27 Gray Eng Ltd Collar for a concrete reinforcement cage
GB2310875B (en) * 1996-03-09 2000-02-09 Gray Eng Ltd Support structure for a cage for reinforcing a concrete pile
GB2328472A (en) 1997-05-30 1999-02-24 Gelton Investments Limited Fixing reinforcing bars
EP0955423A3 (en) 1998-05-02 2000-05-31 Rom Limited Cage former
GB9901746D0 (en) 1999-01-27 1999-03-17 Rom Limited Cage former and clamp therefor
GB9908509D0 (en) * 1999-04-15 1999-06-09 Rom Limited Cage former
GB0011839D0 (en) * 2000-05-18 2000-07-05 Rom Group Limited Ladder spacer for a pile cage
CN106836261B (en) * 2017-02-14 2020-12-01 国网安徽省电力公司芜湖供电公司 Rock foundation structure suitable for power transmission line construction and construction method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1583735A (en) * 1967-11-15 1969-12-05
JPS58188614A (en) * 1982-04-30 1983-11-04 日曹マスタ−ビルダ−ズ株式会社 Manufacture of reinforced concrete
FR2526465A1 (en) * 1982-05-06 1983-11-10 Standarm Metal reinforcement cage for reinforced concrete column - has two complementary halves hooked together at corner bars
GB8915723D0 (en) * 1989-07-10 1989-08-31 Bachy Uk Ltd Wilky reinforcement bar link

Also Published As

Publication number Publication date
DE69405255T2 (en) 1998-01-08
EP0608068A1 (en) 1994-07-27
GB9300995D0 (en) 1993-03-10
GB2274299A (en) 1994-07-20
DE69405255D1 (en) 1997-10-09

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