US3783574A - Centering block for positioning reinforcement iron pieces - Google Patents

Centering block for positioning reinforcement iron pieces Download PDF

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US3783574A
US3783574A US00215800A US3783574DA US3783574A US 3783574 A US3783574 A US 3783574A US 00215800 A US00215800 A US 00215800A US 3783574D A US3783574D A US 3783574DA US 3783574 A US3783574 A US 3783574A
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branches
mould
hollowed
iron pieces
sockets
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G Cennerelli
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    • 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
    • E04C5/203—Circular and spherical spacers

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  • ABSTRACT A centering block for positioning reinforcement iron pieces, in a mould adapted for manufacturing concrete building elements, the said block comprising a circular plastic member provided with a, central chanhe] and with peripheral radially arranged branches, the said channel forming a plurality of recesses of decreasing sizes adapted for lodging iron pieces of different sizes.
  • This invention relates to a wedge designed to be positioned at substantially regular intervals over a mesh of reinforcing rods and to enable the latter to be put in position at the bottom of a mould suitable to take a concrete mix for the manufacture of a reinforced precast unit, e.g., for the manufacture of a building unit such as a concrete panel.
  • the reinforcement made up of round rods assembled to form a mesh or grid, is placed at the bottom of the mould.
  • These reinforcing units have to be kept at a certain distance from the bottom of the mould so that, as the concrete sets, they are inserted inside the building unit at the required distance from each of the two edges and, preferably, substantially in the middle of the thickness of the panel so that the latters internal strength is balanced.
  • wedges designed to enable reinforcing rods to be positioned at a suitable distance and kept evenly spaced from the bottom of the mould are already known. These wedges usually comprise a hollowed-out centre designed to take the reinforcing rod and a peripheral part designed to rest on the bottom of the mould.
  • wedges are advantageously made of moulded plastic, which allows a certain amount of flexible deformation and holds the reinforcing rod better, this being kept in its socket and prevented from moving under the thrust of the concrete mix when the latter is put in.
  • Known wedges usually have the disadvantage that they comprise an inside socket the gauge of which corresponds to a specific reinforcing rod diameter, so that each size or each profile of reinforcing rod calls for a type and size of wedge corresponding exactly to the reinforcing rod in question; the result is that manufacturing and positioning costs are excessive and the storing of the various types of wedges gives rise to problems.
  • the shapes of known wedges are not usually satisfactory: they are too bulky, they resist the passage of the concrete and create a weak area in the latter; moreover, more often than not they comprise projections which are visible on the surface of the panel after casting, giving rise to the risk of cracking and of moisture penetrating to the reinforcing rods.
  • French Pat. No. 1,375,489 suggested making the wedge in the general shape of a circular crown from which points radiate in a star-shape, providing a purchase on the bottom of the mould without any visible projections.
  • the profile of these points is symmetrical in relation to the median plane of the crown, the purchase on the mould is unstable.
  • the reinforcing rod is merely held inside the crown by flexible lugs, which only enables a very small range of diameters to be used.
  • This invention overcomes these various disadvantages and covers the manufacture of a wedge for the positioning of reinforcing units in a mould of the type which comprises a circular grooved part to enable the reinforcing rods to be inserted between two flexible lips and form sockets suitable to take the said reinforcing rods, and a plurality of points radiating in a star-shape around the said part, the said wedge being chiefly characterised by an elongated groove which winds in a loop so as to go round a substantial part of the circumference of the said part and whose edges narrow-progressively from an opening giving on to the outside to the end of the said loop, the said groove comprising,
  • a wedge of this kind can be positioned on reinforcing rods with varying sections, the user merely having to use that one of the sockets which corresponds to the section of the reinforcing rod to be held, and place the wedge so as to obtain the required spacing between the reinforcing rod and the bottom of the mould.
  • FIG. 1 is a plane view of a wedge in accordance with one embodiment of the invention, wherein several reinforcing rodshave been inserted.
  • FIG. 2 is a plane view of the same wedge, with the reinforcing rods removed.
  • FIG. 3 is a sectional view along the line III+III in FIG. 2.
  • the wedge in accordance with the example shown is made of moulded plastic and is in the general shape of a star, consisting of a central core 1 from which branches 2a, 2b, 2a, 2b radiate and whose points rest on the bottom of the mould and constitute the wedges purchase.
  • This purchase limited to the points of two neighbouring stars, is practically invisible on the surface of the panel after casting. There is therefore no risk of cracking or of moisture penetrating to the reinforcing rods.
  • the branches are pyramidal in shape with a triangular base, hollowed out as shown e.g., at 2b, which improves their anchorage in the concrete.
  • branches 2a 2""a have their hollowed-out sides facing towards theunderside of the part
  • branches 2b 2"b have their hollowedout sides facing towards the surface shown in the draw- FIG. 3 shows that the open bases of the branches 2a, 2a are in the plane of one of the surfaces of the part, while the open bases of branches 2b, 2b are in the plane of the other surface.
  • the result of this staggering is that the points of two neighbouring branches such as 2a, 2b provide a comparatively stable purchase on the bottom of the mould.
  • the core 1 there is a groove 3 giving on to the outside at 4 and enabling reinforcing rods to be inserted into it.
  • the groove follows a generally curved line which goes round the circumference of the core 1.
  • edges of the groove 3 comprise facing projections 5 and 5, 6 and 6', 7 and 7', delimiting internal sockets with decreasing gauges 8, 9, etc.
  • These sockets can take reinforcing rods 8', 9', 10' etc. (FIG. 1) whose diameter may e.g., vary from 2 to 24 mm.
  • the reinforcing rod is inserted into the wedge via the opening 4 until it reaches the socket corresponding to its size, in which it is then completely locked.
  • the distance between the centre of the reinforcing rod and the wall of the mould can be varied.
  • a minimum distance e.g., 2 cm
  • a maximum distance e.g., 4 cm
  • a device for positioning reinforcing units in a mould comprising a disc having an eccentric C shape slot therein of tapering width and opening out between two flexible lips and forming sockets for the said reinforcing units, and a plurality of peripheral anchoring branches radiating in a star-shape around the disc, the improvement in which the slot follows a curved line going round a substantial portion of the circumference of the said part and the edges of which narrow from the said lips to the far end of the said curved line, said slot including a plurality of sockets with decreasing gauges.
  • each of said branches is in the shape of a hollowed-out pyramid.
  • the improvement including two sets of hollowed-out pyramidal branches, the hollowed-out surfaces of the branches of the two respective sets being positioned respectively in two planes symmetrically arranged in relation to the median plane of said circular disc part, the branches of one of the sets alternating with the branches of the other.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

A centering block for positioning reinforcement iron pieces, in a mould adapted for manufacturing concrete building elements, the said block comprising a circular plastic member provided with a central channel and with peripheral radially arranged branches, the said channel forming a plurality of recesses of decreasing sizes adapted for lodging iron pieces of different sizes.

Description

United States Patent [1 1 Cennerelli CENTERING BLOCK FOR POSITIONING REINFORCEMENT IRON PIECES [76] Inventor: Giuseppe Cennerelli, 8, Cite Jean Grenmillon, Bobigny, France I [22] Filed: Jan. 6, 1972 [21] Appl. No.: 215,800
[30] Foreign Application Priority Data Jan. 6, 1971 France 7100230 [52] U.S. CI. 52/687 [51] Int. Cl. E04c 5/16 [58] Field of Search 52/687, 688, 689, 52/684, 677
[S6] References Cited I UNITED STATES PATENTS 3,360,898 1/1968 Beckman 52/689 X FOREIGN PATENTS OR APPLICATIONS 1,375,489 /1964 France 52/677 [111. 3,783,574 [451 Jan. 8, 1974 1,573,010 /1969 France 52/684 1,484,976 /1969 Germany 52/684 1,178,193 /1964 Germany 52/687 432,788 /1967 Switzerland 52/684 Primary Examiner-Frank L. Abbott Assistant Examiner-Carl D. Friedman AttorneyWilliam A. Drucker [57] ABSTRACT A centering block for positioning reinforcement iron pieces, in a mould adapted for manufacturing concrete building elements, the said block comprising a circular plastic member provided with a, central chanhe] and with peripheral radially arranged branches, the said channel forming a plurality of recesses of decreasing sizes adapted for lodging iron pieces of different sizes.
3 Claims, 3 Drawing Figures CENTERING BLOCK FOR POSITIONING REINFORCEMENT IRON PIECES This invention relates to a wedge designed to be positioned at substantially regular intervals over a mesh of reinforcing rods and to enable the latter to be put in position at the bottom of a mould suitable to take a concrete mix for the manufacture of a reinforced precast unit, e.g., for the manufacture of a building unit such as a concrete panel.
When manufacturing building units of this kind, the reinforcement, made up of round rods assembled to form a mesh or grid, is placed at the bottom of the mould. These reinforcing units have to be kept at a certain distance from the bottom of the mould so that, as the concrete sets, they are inserted inside the building unit at the required distance from each of the two edges and, preferably, substantially in the middle of the thickness of the panel so that the latters internal strength is balanced.
Wedges designed to enable reinforcing rods to be positioned at a suitable distance and kept evenly spaced from the bottom of the mould are already known. These wedges usually comprise a hollowed-out centre designed to take the reinforcing rod and a peripheral part designed to rest on the bottom of the mould.
These wedges are advantageously made of moulded plastic, which allows a certain amount of flexible deformation and holds the reinforcing rod better, this being kept in its socket and prevented from moving under the thrust of the concrete mix when the latter is put in.
Known wedges usually have the disadvantage that they comprise an inside socket the gauge of which corresponds to a specific reinforcing rod diameter, so that each size or each profile of reinforcing rod calls for a type and size of wedge corresponding exactly to the reinforcing rod in question; the result is that manufacturing and positioning costs are excessive and the storing of the various types of wedges gives rise to problems.
US. Pat. No. 3,449,882 (W. OTT) suggested the inclusion in the wedge of a'V-shaped inside groove, divided by lugs into two sockets-suitable to take two reinforcing rods with different diameters, inserted by spreading the stays of the groove apart. Various other kinds of sockets have been suggested to take two or three reinforcing rods with slightly different diameters,
but none of these devices makes it possible to take, and hold firmly enough, the whole range of reinforcing rods in current use, whose diameters may, e.g., vary from several millimetres to several centimetres.
Moreover, the shapes of known wedges are not usually satisfactory: they are too bulky, they resist the passage of the concrete and create a weak area in the latter; moreover, more often than not they comprise projections which are visible on the surface of the panel after casting, giving rise to the risk of cracking and of moisture penetrating to the reinforcing rods.
French Pat. No. 1,375,489 (DOWTY) suggested making the wedge in the general shape of a circular crown from which points radiate in a star-shape, providing a purchase on the bottom of the mould without any visible projections. However, as the profile of these points is symmetrical in relation to the median plane of the crown, the purchase on the mould is unstable. In addition, the reinforcing rod is merely held inside the crown by flexible lugs, which only enables a very small range of diameters to be used.
Finally, in all known devices, the distance between the reinforcing rod and the purchase on the mould cannot be adjusted, which means that several types of wedges have to be provided for each reinforcing rod diameter to take into account the fact that the reinforcing rod must be embedded in a greater or lesser thickness of concrete according to the building requirements.
This invention overcomes these various disadvantages and covers the manufacture of a wedge for the positioning of reinforcing units in a mould of the type which comprises a circular grooved part to enable the reinforcing rods to be inserted between two flexible lips and form sockets suitable to take the said reinforcing rods, and a plurality of points radiating in a star-shape around the said part, the said wedge being chiefly characterised by an elongated groove which winds in a loop so as to go round a substantial part of the circumference of the said part and whose edges narrow-progressively from an opening giving on to the outside to the end of the said loop, the said groove comprising,
opposite one another on its edges, projections delimiting a plurality of sockets with decreasing gauges.
A wedge of this kind can be positioned on reinforcing rods with varying sections, the user merely having to use that one of the sockets which corresponds to the section of the reinforcing rod to be held, and place the wedge so as to obtain the required spacing between the reinforcing rod and the bottom of the mould.
Other characteristics and advantages of the invention will clearly emerge from the following specification.
In the attached drawing:
FIG. 1 is a plane view of a wedge in accordance with one embodiment of the invention, wherein several reinforcing rodshave been inserted.
FIG. 2 is a plane view of the same wedge, with the reinforcing rods removed.
FIG. 3 is a sectional view along the line III+III in FIG. 2.
The wedge in accordance with the example shown is made of moulded plastic and is in the general shape of a star, consisting of a central core 1 from which branches 2a, 2b, 2a, 2b radiate and whose points rest on the bottom of the mould and constitute the wedges purchase. This purchase, limited to the points of two neighbouring stars, is practically invisible on the surface of the panel after casting. There is therefore no risk of cracking or of moisture penetrating to the reinforcing rods. The branches are pyramidal in shape with a triangular base, hollowed out as shown e.g., at 2b, which improves their anchorage in the concrete.
It can be seen that branches 2a 2""a have their hollowed-out sides facing towards theunderside of the part, while branches 2b 2"b have their hollowedout sides facing towards the surface shown in the draw- FIG. 3 shows that the open bases of the branches 2a, 2a are in the plane of one of the surfaces of the part, while the open bases of branches 2b, 2b are in the plane of the other surface. The result of this staggering is that the points of two neighbouring branches such as 2a, 2b provide a comparatively stable purchase on the bottom of the mould.
In the core 1 there is a groove 3 giving on to the outside at 4 and enabling reinforcing rods to be inserted into it. The groove follows a generally curved line which goes round the circumference of the core 1. The
edges of the groove 3 comprise facing projections 5 and 5, 6 and 6', 7 and 7', delimiting internal sockets with decreasing gauges 8, 9, etc. These sockets can take reinforcing rods 8', 9', 10' etc. (FIG. 1) whose diameter may e.g., vary from 2 to 24 mm.
The reinforcing rod is inserted into the wedge via the opening 4 until it reaches the socket corresponding to its size, in which it is then completely locked.
By positioning the wedge suitably in relation to the mould, the distance between the centre of the reinforcing rod and the wall of the mould can be varied. For example, taking reinforcing rod 10, it is obvious that there will be a minimum distance (e.g., 2 cm) between it and the wall of the mould if the wedge rests on points 2'a, 2b, while there will be a maximum distance (e.g., 4 cm) between it and the wall of the mould if the wedge rests on points 2b 2""a. The distance can be varied gradually between these two limits.
It goes without saying that the dimensions indicated are not limitative, and that details may be modified without thereby departing from the scope of the invention.
I claim:
1. In a device for positioning reinforcing units in a mould, comprising a disc having an eccentric C shape slot therein of tapering width and opening out between two flexible lips and forming sockets for the said reinforcing units, and a plurality of peripheral anchoring branches radiating in a star-shape around the disc, the improvement in which the slot follows a curved line going round a substantial portion of the circumference of the said part and the edges of which narrow from the said lips to the far end of the said curved line, said slot including a plurality of sockets with decreasing gauges.
2. In a device in accordance with claim 1, the improvement in which each of said branches is in the shape of a hollowed-out pyramid.
3. In a device in accordance with claim 2 the improvement including two sets of hollowed-out pyramidal branches, the hollowed-out surfaces of the branches of the two respective sets being positioned respectively in two planes symmetrically arranged in relation to the median plane of said circular disc part, the branches of one of the sets alternating with the branches of the other.

Claims (3)

1. In a device for positioning reinforcing units in a mould, comprising a disc having an eccentric C shape slot therein of tapering width and opening out between two flexible lips and forming sockets for the said reinforcing units, and a plurality of peripheral anchoring branches radiating in a star-shape around the disc, the improvement in which the slot follows a curved line going round a substantial portion of the circumference of the said part and the edges of which narrow from the said lips to the far end of the said curved line, said slot including a plurality of sockets with decreasing gauges.
2. In a device in accordance with claim 1, the improvement in which each of said branches is in the shape of a hollowed-out pyramid.
3. In a device in accordance with claim 2 the improvement including two sets of hollowed-out pyramidal branches, the hollowed-out surfaces of the branches of the two respective sets being positioned respectively in two planes symmetrically arranged in relation to the median plane of said circular disc part, the branches of one of the sets alternating with the branches of the other.
US00215800A 1971-01-06 1972-01-06 Centering block for positioning reinforcement iron pieces Expired - Lifetime US3783574A (en)

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BE (1) BE777456A (en)
CA (1) CA960058A (en)
CH (1) CH547158A (en)
DE (1) DE2200512C3 (en)
FR (1) FR2121365B1 (en)
GB (1) GB1372624A (en)
IT (1) IT946327B (en)
NL (1) NL7200159A (en)
SE (1) SE370976B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644727A (en) * 1984-02-06 1987-02-24 Fabcon, Inc. Strand chair for supporting prestressing cable and cross-mesh in elongated precast concrete plank
US5347787A (en) * 1993-08-25 1994-09-20 Gavin Norman W Universal spacer for concrete reinforcement rods
US6176061B1 (en) * 1998-12-22 2001-01-23 Earl D. Smith Combination reinforcement bar connector and gauge
US20070049429A1 (en) * 2005-08-31 2007-03-01 Russell Corporation Reinforced sports support pole
US7451579B2 (en) 2005-10-12 2008-11-18 Concrete Accessories, Inc. Reinforcement bar spacer wheel
US20110120045A1 (en) * 2009-11-25 2011-05-26 Gavin Peter W Universal spacer for concrete reinforcement rods and wire
USD968934S1 (en) * 2019-08-27 2022-11-08 Tokyo Rope Mfg. Co., Ltd. Wire rope core

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8101798L (en) * 1981-03-20 1982-09-21 A Betong Ab POSTS OF CONCRETE AND WAY TO MAKE THE SUIT
GB2137252A (en) * 1983-03-30 1984-10-03 Selma Dreizler Spacer for reinforcement mats
GB2158848A (en) * 1984-05-17 1985-11-20 Chao Yung Tzu Spacer for concrete reinforcing steel
FR2641017A1 (en) * 1988-12-27 1990-06-29 Soletanche Centring device for a tie or anchor bar
BE1009977A3 (en) * 1996-01-26 1997-11-04 Paesen Rudi Distance piece for reinforced concrete construction - has zig-zag folded rods networked between the support rods and fixture piece to secure to concrete layer
CN112282219A (en) * 2020-10-19 2021-01-29 内蒙古路桥集团有限责任公司 Special cushion block for prefabricated beam web and manufacturing method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178193B (en) * 1958-03-21 1964-09-17 Ursula Reuss Geb Keiloweit Plastic spacers for concrete reinforcement bars
FR1375489A (en) * 1963-11-25 1964-10-16 Dowty Seals Ltd Spacers for concrete reinforcement
CH432788A (en) * 1964-02-05 1967-03-31 Kiener Albert Spacer for concrete rebar
US3360898A (en) * 1965-11-08 1968-01-02 Nat Lock Co Concrete weld plate
DE1484976A1 (en) * 1964-09-03 1969-02-13 Seifert Geb Spacer for reinforcement systems in concrete components
FR1573010A (en) * 1967-12-27 1969-07-04

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371116A (en) * 1963-10-11 1964-08-28 Rapid Metal Developments Aust Spacer for reinforcement
FR1461351A (en) * 1964-07-16 1966-02-25 Spacer for rebars
DE1946137U (en) * 1966-04-14 1966-09-15 Kuno Reuss SPACERS FOR CONCRETE REBAR.
CH467403A (en) * 1966-12-19 1969-01-15 Erni Ernst Spacers for cylindrical elements, especially concrete-iron bars
US3449882A (en) * 1967-03-15 1969-06-17 Walter Ott Reinforcing rod spacer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178193B (en) * 1958-03-21 1964-09-17 Ursula Reuss Geb Keiloweit Plastic spacers for concrete reinforcement bars
FR1375489A (en) * 1963-11-25 1964-10-16 Dowty Seals Ltd Spacers for concrete reinforcement
CH432788A (en) * 1964-02-05 1967-03-31 Kiener Albert Spacer for concrete rebar
DE1484976A1 (en) * 1964-09-03 1969-02-13 Seifert Geb Spacer for reinforcement systems in concrete components
US3360898A (en) * 1965-11-08 1968-01-02 Nat Lock Co Concrete weld plate
FR1573010A (en) * 1967-12-27 1969-07-04

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644727A (en) * 1984-02-06 1987-02-24 Fabcon, Inc. Strand chair for supporting prestressing cable and cross-mesh in elongated precast concrete plank
US5347787A (en) * 1993-08-25 1994-09-20 Gavin Norman W Universal spacer for concrete reinforcement rods
US6176061B1 (en) * 1998-12-22 2001-01-23 Earl D. Smith Combination reinforcement bar connector and gauge
US20070049429A1 (en) * 2005-08-31 2007-03-01 Russell Corporation Reinforced sports support pole
US7357738B2 (en) * 2005-08-31 2008-04-15 Russell Corporation Reinforced sports support pole
US7451579B2 (en) 2005-10-12 2008-11-18 Concrete Accessories, Inc. Reinforcement bar spacer wheel
US20110120045A1 (en) * 2009-11-25 2011-05-26 Gavin Peter W Universal spacer for concrete reinforcement rods and wire
US8327599B2 (en) 2009-11-25 2012-12-11 Polylok Inc. Universal spacer for concrete reinforcement rods and wire
USD968934S1 (en) * 2019-08-27 2022-11-08 Tokyo Rope Mfg. Co., Ltd. Wire rope core

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Publication number Publication date
FR2121365B1 (en) 1977-06-17
CH547158A (en) 1974-03-29
SE370976B (en) 1974-11-04
DE2200512C3 (en) 1978-07-27
DE2200512B2 (en) 1977-12-08
DE2200512A1 (en) 1972-07-20
NL7200159A (en) 1972-07-10
FR2121365A1 (en) 1972-08-25
CA960058A (en) 1974-12-31
IT946327B (en) 1973-05-21
BE777456A (en) 1972-04-17
GB1372624A (en) 1974-11-06

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