• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A clip (60) is provided for retaining a spacing device about a reinforcement or tie rod. The clip comprises a head part (62), a prong and spaced flanges (66) extending from said head part. The prong is for engaging free ends of the guide plates, and the flanges are for respectively engaging side faces of said guide plates.
    公开号:AU2013202153A1
    申请号:U2013202153
    申请日:2011-08-19
    公开日:2013-05-02
    发明作者:Dennis J. Mee
    申请人:Mee Dennis J Mr；
    IPC主号:E04C5-20
    专利说明:
    1 RETAINING CLIP FOR SPACING DEVICES FIELD OF THE INVENTION [0001] THIS INVENTION relates to a spacing device for spacing reinforcement rods in a construction (such as concrete) structure and in particular but not limited thereto, the spacing device is for spacing a reinforcement cage formed of parallel reinforcement steel rods which are secured to circular tie rods or a helical tie rod. [0002] THIS INVENTION also relates to a clip for retaining a spacing device about a reinforcement rod or a tie rod. BACKGROUND OF THE INVENTION [0003] Construction such as concrete structures generally incorporate reinforcement steel rods for enhancing structural strengths, in particular tensile strength. The structures can be in the form of piers or buildings, which may have walls, slabs, columns, piles, pillars and the like. The reinforcement steel rods may be formed into a cage or lattice and placed in position before pouring of a settable construction material such as wet concrete. The cage or lattice may move while pouring or in the settable material like wet cement. As such, the formed construction or concrete structures may have weakened zones. If any of the steel rods are exposed they are prone to be subject to corrosions. Generally, spacing devices are placed about the reinforcement rods to minimise movement of the rods towards the surface. These devices are commonly known as spacer wheels. [0004] Spacer wheels have an open mouth for insertion of a reinforcement steel rod or tie rod. The spacer wheels can be dislodged from the rods. This is undesirable as it will result in weakened and/or exposed zones in a construction or concrete structure.
    2 [0005] Spacer wheels are generally made of a plastic material which will soften or melt at elevated temperatures. If melting occurs, the reinforcement rods and tie rods may become exposed to water ingress and other contaminants and subsequently deteriorate. As a consequence, the reinforcement and tie rods will be subject to rusting as they are exposed to the elements. Rusting of the steel rods will weaken structural strengths of the construction or concrete structure. [0006] When pouring wet concrete, the spacer wheels may prevent the settable construction material or concrete mixture from reaching areas within the wheels. Accordingly, there may be voids in the construction/concrete structure. The voids weaken structural strength of the structure. OBJECTS OF THE INVENTION [0007] It is an object of the present invention to provide a spacing device which alleviates or reduces to a certain level one or more of the prior art disadvantages. [0008] It is another object of the present invention to provide a clip which alleviates or reduces to a certain level one or more of the prior art disadvantages. SUMMARY OF THE INVENTION [0009] In one aspect therefore the present invention resides in a spacing device for spacing reinforcement or tie rods in a settable construction structure. The device comprises a body configured with an outer ring member, an inner hub having a hub wall configured to form an opening thereabout and a gap in communication with the opening, spaced spokes extending between the ring member and the hub, and a mouth formed between guide plates which extend from the ring member towards the opening. The mouth is adapted for insertion 3 of a reinforcement or tie rod through said gap into the opening. The body is shaped so that at least one of its sides projects along a plane which tapers axially outwardly from the ring member to the hub. [0010] The body of the device of said one aspect of the invention may be formed of a compound which expands when exposed to temperatures above a predetermined value. [0011] In a second aspect therefore the present invention resides in a spacing device for spacing reinforcement or tie rods in a settable construction structure. The device comprises a body configured with an outer ring member, an inner hub having a hub wall configured to form an opening thereabout and a gap in communication with the opening, spaced spokes extending between the ring member and the hub, and a mouth formed between guide plates extending from the ring member towards the opening. The mouth is adapted for insertion of a reinforcement or tie rod through said gap into the opening. The body is formed of a compound which expands when exposed to temperatures above a predetermined value. [0012] It is preferred that the settable construction material is wet concrete. [0013] The body of the device of said second aspect may be shaped so that at least one of its sides projects along a plane which tapers axially outwardly from the ring member to the hub. [0014] In a third aspect therefore the present invention resides in a clip for retaining a spacing device about a reinforcement or tie rod. The spacing device has a body configured with an outer ring member, an inner hub having a hub wall configured to form an opening thereabout and a gap in communication with the opening, and a mouth formed between guide plates extending from the ring member towards the opening. The mouth is adapted for insertion of a reinforcement or tie rod through said gap into the opening. The clip comprises a 4 head part, a prong extending from said head part, and spaced flanges extending from said head part. The prong is adapted for engaging free ends of the guide plates, and the flanges are adapted for respectively engaging side faces of said guide plates. Thereby, in use, the clip retains said reinforcement or tie rod in the opening. [0015] The prong may be T-shaped with a crossed part and a vertical part. The cross part is adapted for engaging said free ends and the vertical part is for insertion into the mouth. [0016] The prong may also be Y-shaped with wing parts arranged angularly therebetween. Two adjacent wing parts are adapted to engage respective free ends of the guide plate. In that position, the remaining wing part may be sized to enter said mouth. [0017] The flanges may be configured to engage the guide plates in a manner to limit movement of the plates for expanding said mouth. In preference, the compound is a carbon fibre. Preferably, the compound is a mixture of a heat expandable material and a plastic material. More preferably, the compound is substantially flame retardant. [0018] The mixture may include 5% to 50% of expandable graphite in proportion to 95% down to 50% of polypropylene. In a specially preferred form, the mixture has 6% of expandable graphite and 94% of polypropylene. [0019] Preferably, the guide plates are configured to extend convergently from said ring member so that said mouth narrows progressively from said ring member. The guide plates may be adapted to flex so that the mouth expands when a reinforcement or tie rod is in engagement with the guide plates while being positioned to move through the mouth into the opening. [0020] Preferably, the body is shaped so that both of its sides project along a 5 plane which tapers axially outwardly from the ring member to the hub. In one form, the body is saucer-shaped. The shape of the body thus facilitates wet concrete to fill webbing or cavities between the spokes. [0021] In order that the present invention may be more readily understood and put into practical effect reference will now be made to the accompanying drawings which illustrate preferred embodiments of the invention and wherein: BRIEF DESCRIPTION OF THE INVENTION [0022] Figure 1 is a schematic view illustrating lowering of a reinforcement cage with spacer wheels into a shaft; [0023] Figure 2 is a partial schematic view illustrating an embodiment of the spacing device according to the present invention being positioned onto a reinforcement tie rod of the cage shown in Figure 1; [0024] Figure 3 is a side view of the spacing device shown in Figure 2; [0025] Figure 4 is a top view of the spacing device shown in Figure 3; [0026] Figure 5 is a top view of an embodiment of the spacer wheel assembly according to the present invention; [0027] Figure 6 is a perspective view of the clip and the spacing to be positioned into the assembly as shown in Figure 5; and [0028] Figure 7 is a table showing expansion volume of an example of the compound of the spacing device.
    6 DETAIL DESCRIPTION OF THE INVENTION [0029] Referring to the drawings and initially to Figures 1 and 2, there is illustrated an embodiment of the spacing devices 10 positioned on reinforcement steel tie rods 14 of a reinforcement cage 12 being lowered into a shaft 16 in the ground 18. A crane 20 is used to lift the cage and to lower it into the shaft. [0030] As shown more clearly in Figure 2, the cage 12 has a number of parallel straight steel reinforcement rods 13 secured to longitudinally spaced circular steel reinforcement tie rods 14 by securing means such as welding or ties. The circular tie rods may be replaced with a helical tie rod (not shown). [0031] These reinforcement rods 13,14are commonly referred to as rebars, and the spacer devices 10 are commonly referred to as a spacer wheels. [0032] Referring to Figures 3 and 4, the spacer wheel 10 is in the form of a saucer-shaped body having an outer ring member 22, an inner hub 24 formed with a central opening 26 and a gap 28 interrupting its gap wall 30, and spokes 32 extending between the ring member 22 and the hub 24. The ring member 22 and two spaced guiding plates 34 together form a mouth 36 in alignment with the gap 28. The hub 24 has an axial length longer than the axial length of the outer ring member 22. Each of the sides 11 of the body 10 lie in a plane which tapers axially outwardly to the hub 24. [0033] The guide plates 34 extend convergently from the ring member 22 and are pivotally movable or deflectable. When a rebar 13 or 14 is in the mouth 36, the plates 34 are caused to flex due to engagement with the spacer wheel 10. As such, the mouth 36 expands to allow the rebar to move into the opening 26 through the gap 28. [0034] Cavities 38 are formed between the spokes 32 and between a spoke 7 32 and a plate 34. Strengthening ribs 40 and plates 42 are arranged adjacent to the guide plates 34. [0035] Referring now to the spacer wheel assembly 50 shown in Figures 5 and 6, the assembly has a spacer wheel 10 substantially as described above, and a retainer clip 60. The clip has a head 62, a prong 64 and spaced flanges 66, both extending from the head 62. The prong 64 is formed of three angular wings 68 which are shaped and sized so that two of them can engage free ends 35 of the guide plates 34 and the remaining one can extend between the guide plates and into the mouth. In that position, the flanges 66 would engage the inside face 37 of each of the plates 34. Accordingly, the rebar 13 in the opening 26 is retained therein while allowing the spacer wheel 10 to rotate as shown more clearly in Figure 5. [0036] The body 10 is made of a compound of a mixture of 6% of expandable graphite and 94% of polypropylene. [0037] The compound is substantially flame resistant and is self repairing. During extreme fires, small amounts of the compound may burn away at the exposed surface due to extreme heat. The compound will continue to expand to temperatures up to 1000 deg C to maintain a seal at the same time insulating the remainder of the spacer wheel 10. Tests show that even after maintained surface temperature in excess of 500 deg C the area around the rebars remain at less than 100 deg C at a minimum test depth of 50mm. [0038] Figure 7 shows the ability of the reactive ingredient of the carbon fibre compound to expand to many times its original volume. Reactions begin to occur at 200 deg C and continue up to 1000 deg C. The compound is therefore flame resistant, and providing insulation and self-repairing during extreme heat. [0039] The tapered outer shape of the spacer wheel 10 ensures concrete is able to fill in and around the cavities and webbing without creating void spots.
    8 The spacer wheel also has compression strengths for use with concrete. [0040] The spacer wheel 10 complies with AS3758-1990 Guidelines for evaluating the effectiveness of Flame Retardants and is tested for Chloride Penetration Resistance using ASTM C1202-10. The compound reacts during the curing of the concrete to expand and provide a seal which protects the rebars from the environment. A Coulomb value of 465 was achieved in the 'Standard Cure' 58 day sample in the Chloride Penetration tests. [0041] Tests on the new Carbon Fibre SS Wheel have shown that compression strengths of 44Mpa are achieved which falls within the acceptance criteria of Queensland Transport and Main Roads Technical standard MRTS70 for this application. [0042] The spacer wheel clip 60 is designed to give added security between the Spacer Wheel and the Reinforcing steel bar. The Spacer wheel clip can be applied to the wheel 10 after the wheel has been fitted to the reinforcing spiral bar 14. The clip ensures that the wheel cannot be dislodged as the cage 12 is lowered into or lifted from the excavated bored hole or shaft 16. This ensures security of application for a varying gauge of spiral up to 20mm. [0043] The spacer wheels 10 when fitted to a steel reinforcement cage 12 ensure that the cage is insulated from the excavated hole that is dug for the purposes of installing a column of concrete. The spacers are also used in all situations where concrete needs to be reinforced with reinforcing bars. Precast Bridge Beams are another application where reinforcing needs to be installed in the concrete and therefore needs the use of Spacer wheels. [0044] The flying saucer shaped spacer wheels 10 have a narrower, outer periphery in order that there is less exposed surface of the wheel to the elements whilst also allowing proper binding of the concrete around and through the wheel.
    9 [0045] The Clip 60 is easily applied after the wheel 10 has been fitted to the cage 12. The clip 60 ensures the wheel cannot be forced from the cage due to forces applied during installation of the cage. The application of the wheel entails forcing the wheel over the horizontal tie bars 13 that encircle the cage until the bar reaches the centre of the wheel. There is a chance that the wheel could be forced off the bar as the cage is lowered into the bored hole particularly if the bar is significantly narrower in gauge than the standard/more common size tie bars. The clip loses the gap to ensure the bar cannot make its way back through the clipping mechanism of the wheel. The process of installing a bored pile cage and subsequent filling with concrete requires: boring a shaft; slowly lowering a reinforcement cage into the bored shaft by crane and as it is lowered the wheels are manually applied to the cage; further lifting the cage and removing it from the bored shaft in order to perform further digging for increasing the depth of the shaft or simply to clean the shaft from earth that may have dropped in during this operation; finally lowering the cage and pumping concrete via a concrete delivery truck. [0046] If the wheels are not secure on the cage they may fall off during the process of placement and removal and thus become ineffective. The clips ensure the wheel remains in place. [0047] The Compound of the body is fire resistant and expansive under heat, whilst maintaining sufficient compressive strength to withstand the pressures that are to be expected in the process of their use. This is important to ensure that when the wheel is installed in a bridge column or bridge beam or similar situation and is exposed to the effects of fire it will not melt out or catch fire so as to leave a void in the concrete structure. It is also important that the compound has a significant coulomb rating sufficient to restrict contaminants such as water progressing along the join of the wheel from the outside finished 10 surface of the concrete to the reinforcing bar it is attached to. This is at the essence of why the wheel is essential to the construction of the concrete structure to protect the steel reinforcing from rusting and thus weakening the structure. [0048] Whilst the above has been given by way of illustrative example of the present invention many variations and modifications will be apparent to those skilled in the art without departing from the broad ambit and scope of the invention as herein set forth in the following claims.
    权利要求:
    Claims (15)
    [1] 1. A clip for retaining a spacing device about a reinforcement or tie rod, the spacing device having a body configured with an outer ring member; an inner hub having a hub wall configured to form an opening thereabout and a gap in communication with the opening; and a mouth formed between guide plates extending from the ring member towards the opening, the mouth being adapted for insertion of a reinforcement or tie rod through said gap into the opening; the clip comprises a head part, a prong extending from said head part, and spaced flanges extending from said head part, the prong being adapted for engaging free ends of the guide plates, and the flanges being adapted for respectively engaging side faces of said guide plates, thereby, in use, the clip retains said reinforcement or tie rod in the opening.
    [2] 2. The clip according to claim 1 wherein the prong is T-shaped with a crossed part and a vertical part. The cross part is adapted for engaging said free ends and the vertical part is adapted for insertion into the mouth.
    [3] 3. The clip according to claim 1 or 2 wherein the prong is Y-shaped with wing parts arranged angularly therebetween, two adjacent wing parts being adapted to engage respective free ends of the guide plate, and in that position, the remaining wing part is sized to enter said mouth.
    [4] 4. The clip according to any one of claims 1 to 3 wherein the flanges are configured to engage the guide plates in a manner to limit movement of the plates for expanding said mouth.
    [5] 5. The clip according to any one of claims 1 to 4 wherein the clip being formed of a compound which expands when exposed to temperatures above a predetermined value.
    [6] 6. The clip according to claim 5 wherein the compound is a carbon fibre. 12
    [7] 7. The clip according to claim 5 wherein the compound is a mixture of a heat expandable material and a plastic material.
    [8] 8. The clip according to claim 7 wherein the mixture includes 5% to 50% of expandable graphite in proportion to 95% down to 50% of polypropylene.
    [9] 9. The clip according to claim 8 wherein the mixture has 6% of expandable graphite and 94% of polypropylene.
    [10] 10. The clip according to any one of claims 5 to 9 wherein the compound is substantially flame retardant.
    [11] 11. The clip according to any one of claims 1 to 10 wherein the guide plates are configured to extend convergently from said ring member so that said mouth narrows progressively from said ring member.
    [12] 12. The clip according to any one of claims 1 to 11 wherein the guide plates are adapted to flex so that the mouth expands when a reinforcement or tie rod is in engagement with the guide plates while being positioned to move through the mouth into the opening.
    [13] 13. The clip according to any one of claims 1 to 12 wherein the body is shaped so that both of its sides project along a plane which tapers axially outwardly from the ring member to the hub.
    [14] 14. The clip according to claim 13 wherein the body is substantially saucer-shaped.
    [15] 15. A clip for retaining a spacing device about a reinforcement or tie rod substantially as hereinbefore described with reference to the drawings.
    类似技术:
    公开号 | 公开日 | 专利标题
    JP6316665B2|2018-04-25|Composite structure of steel girder and precast slab and its construction method
    CN103572755A|2014-02-12|Prestressed concrete precast pile
    US10563369B2|2020-02-18|High strength jet anchor
    KR101006963B1|2011-01-12|Assembly retaining wall system using ground reinforcement and pile, and its construction method
    AU2013202153B2|2014-12-11|Retaining Clip for Spacing Devices
    AU2011213779B2|2015-05-14|Spacing Device and Retaining Clip therefor
    KR101531766B1|2015-06-25|Method of Pre-supported tunnel costructed in a soft ground
    EP3336259B1|2019-10-16|Anchor for anchoring in the ground and/or rock with reversible tension member
    Tan et al.2004|Slope stabilization using soil nails: design assumptions and construction realities
    JP2001132004A|2001-05-15|Earthquake resistant placing method for raising of building and settlement correction work
    JP6322490B2|2018-05-09|Pile head treatment method for severing material and site-built pile
    JP5265471B2|2013-08-14|Abutment and bridge girder reinforcement method
    KR102070912B1|2020-03-02|Phc pile for soil retaining wall, mold assembly and manufacturing method thereof
    KR102110260B1|2020-05-13|Mold assembly for manufacturing phc pile for soil retaining wall
    JP6506902B2|2019-04-24|Pile foundation structure and construction method of pile foundation structure
    KR20090000818U|2009-01-30|A cast-in place pile using multi-piled up metal nets
    JP2017095915A|2017-06-01|Junction structure between column-beam joint part and column, rigid-frame viaduct, construction method for junction structure between column-beam joint part and column, and precast concrete member
    CN210766868U|2020-06-16|Reinforcing structure for existing gravity retaining wall
    KR101488970B1|2015-02-02|Supporting pile with reinforcing blade and construction method thereof
    AU2010364506B2|2017-03-02|Facing element with integrated compressibility
    JP4560557B2|2010-10-13|Seismic reinforcement method for bridges
    Mortier et al.2019|The Rijnlandroute bored tunnel–continuously improving the mechanized tunneling process
    KR101773565B1|2017-09-01|Underground structure using c.i.p. structure
    TWI616575B|2018-03-01|Concrete pile
    JP6006004B2|2016-10-12|Pile head space formation auxiliary tool, hollow ready-made pile provided with the same, pile head processing method using the hollow ready-made pile, and pile head space forming method
    同族专利:
    公开号 | 公开日
    AU2013202153B2|2014-12-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2215355A|1988-02-25|1989-09-20|M C M|Spacer wheel for steel cages|
    US5509636A|1993-08-27|1996-04-23|Cotugno; Joseph A.|Retainer clip for reinforcement of concrete walls|
    法律状态:
    2015-04-09| FGA| Letters patent sealed or granted (standard patent)|
    2021-03-18| MK14| Patent ceased section 143(a) (annual fees not paid) or expired|
    优先权:
    申请号 | 申请日 | 专利标题
    AU2010903738||2010-08-20||
    AU2013202153A|AU2013202153B2|2010-08-20|2011-08-19|Retaining Clip for Spacing Devices|
    AU2011213779A|AU2011213779B2|2010-08-20|2011-08-19|Spacing Device and Retaining Clip therefor|AU2013202153A| AU2013202153B2|2010-08-20|2011-08-19|Retaining Clip for Spacing Devices|
    [返回顶部]