US3302360A - Method of reinforcing concrete floors and the like, and a reinforcing element therefor - Google Patents

Method of reinforcing concrete floors and the like, and a reinforcing element therefor Download PDF

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Publication number
US3302360A
US3302360A US332447A US33244763A US3302360A US 3302360 A US3302360 A US 3302360A US 332447 A US332447 A US 332447A US 33244763 A US33244763 A US 33244763A US 3302360 A US3302360 A US 3302360A
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reinforcing
floor
horizontal plane
foot
reinforcement
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US332447A
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English (en)
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Bjerking Sven-Erik
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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
    • E04C5/01—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
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs
    • 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
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance

Definitions

  • concrete floors and other substantially horizontally extending, self-supporting concrete structures are provided both with a bottom reinforcement which, in the case of floors, is constituted, as a rule, by a grid of crossing reinforcing bars extending throughout the free length and width, respectively, of the floor and spaced slightly above the bottom surface of the slab, and with a so-called top reinforcement disposed adjacent and above supporting walls, supporting columns or other supporting points and consisting of comparatively short reinforcing bars which are embedded in the concrete a few centimeters beneath its free top surface.
  • the bottom reinforcement is usually placed on thin concrete spacer blocks which rest on the mould bottom and support the reinforcement bars at a desired level above the same.
  • top reinforcement On a plurality of cross-wise extending, relatively thick reinforcement irons, s-o-called mounting irons, which are supported, in turn, by spacer members of the required rather considerable height placed on the bottom reinforcement and usually consisting of reinforcement irons bent into a suitable shape.
  • the mounting irons and the appertaining spacer members have for their sole purpose to maintain the top reinforcement in proper position during the casting operation, and they do not increase the load-carrying capacity of the finished concrete slab or the like. It has long been felt to involve a waste of reinforcing steel to use heavy, transversely extending mounting-steel members supported on separate, relatively high supports for the single purpose of keeping the top reinforcement in position during the casting operation. Further, it has been experienced that the mounting irons supported at a substantial height above the mould bottom are in the way of the worker who may readily stumble over the irons as he must pass over the same. Therefore, it has long been desired to find another, more practical and economical solution to the problem of keeping the top reinforcement in place during the concrete-casting operation.
  • this problem has been solved by providing special top reinforcement members by bending lengths of reinforcement-steel at their ends, and possibly also intermediate their ends, so as to form a kind of feet which, supported on the bottom reinforcement or on low supporting blocks of concrete or the like placed on the mould bottom, maintain said reinforcement members at a desired level above the mould bottom.
  • these feet are provided by bending a reinforcement steel into the shape of a preferably closed and substantially rectangular, elongate stirrup, or loop, and by bending off one end portion, at least, of this loop through a suitable angle from the plane common to the two longitudinally extending portionsthereof, and in a manner to cause the supporting surfaces on the bent-off portions to be disposed at such a distance from the plane common to the two longitudinally extending portions that, within the concrete structure to be cast, the latter will be disposed at a desired depth beneath the free top surface of this construction.
  • bentoff end portions of the reinforcement-steel members are adapted to ensure an excellent anchorage of these 'steel 3,302,360 Patented Feb. 7, 1967 members at their ends within the concrete, making it unnecessary to extend the steel members lengthwise in order to ensure sufficient gripping action.
  • the bent-off end or foot portions will not, or will only unnoticeably, increase the required weight of the reinforcing members of the top or topedge reinforcement, and in certain cases it would even be possible to count upon a reduction of the required steel weight.
  • the elimination of mounting iron and the high supports therefor involve a corresponding direct saving in steel weight, since, as mentioned hereinbefore, these elements do not contribute to the strength of the fiinished concrete slab or the like.
  • FIGURE 1 shows a plurality of concrete-reinforcing elements according to the invention in the form of closed elongate loops bent-off or angularly off-set at both ends, and supported upon the bottom reinforcement for a concrete floor above an intermediate supporting or spine wall;
  • FIGURE 2 in a similar manner, shows the disposition of reinforcing elements in the form of open loops
  • FIGURES 3 and 4 illustrate two different ways of forming a top reinforcement comprising reinforcing elements disposed in pairs of elements overlapping each other endwise;
  • FIGURE 5 shows reinforcing elements formed with intermediate supports or feet and disposed in place in the casting mould
  • FIGURES 6 to 10 show further applications of the invention.
  • numeral 10 designates the mould for casting a concrete floor
  • numeral 11 denotes a supporting or spine wall which has just been cast and is intended to support the concrete floor
  • 12 designates the bottom reinforcement.
  • the latter conventionally, comprises longitudinally extending reinforcing-steel bars 13 and transversely extending reinforcing-steel bars 14 crossing the bars 13.
  • the bottom reinforcement is supported on low concrete spacers 15 which are disposed on the mould bottom, whereby a predetermined clearance is maintained between the bottom reinforcement and the mould bottom.
  • the top reinforcement comprises a plurality of reinforcing elements 16 formed in accordance with the present invention and disposed in side-by-side relation upon the bottom reinforcement 12.
  • Each reinforcing element consists of a reinforcing-steel bar which is bent into the shape of a closed elongate rectangular loop which, in its turn, is bent off at its ends whereby the short transverse end portions 17 of the rectangle will form feet for carrying the long portions 18 extending longitudinally.
  • the reinforcing elements are placed on the bottom reinforcement with its foot portions 17 supported on corresponding ones of the transversely extending reinforcing bars 14.
  • the feet 17 are tied to the reinforcing bars with tie wires or lashings 19 whereby the reinforcing elements are securely maintained in predetermined positions relative to the bottom reinforcement.
  • the distance of the bent-off foot portions 17 from the common plane of the longitudinally extend- 3 ing portions 18 is so chosen in relation to the thickness of the concrete floor to be cast as to cause the longitudinally extending portions to be disposed at a desired depth beneath the top surface of the finally cast floor.
  • the bent-off end portions will afford for the reinforcing elements according to the invention an extraordinarily satisfactory anchorage within the concrete, and this renders it unnecessary to extend the longitudinal portions-- which will have to carry the tensile and compressive loads concerned further in order to ensure the required gripping action at their ends.
  • the straight longitudinal portions can be made of a length which is so much shorter than that of conventional straight reinforcing :bars that the overall weight of the reinforcing element will scarely be higher, and in certain cases even lower, than the weight of two straight reinforcing bars of the same cross-sectional area.
  • the omission of high supports and mounting members therefore, as a rule, will involve a direct saving in overall steel-weight.
  • the spaced parallel parts of the bent-off end portions suitably form obtuse angles with the longitudinal sides of the reinforcing element, these angles being preferably about 120.
  • FIGURE 2 illustrates a modified configuration of the reinforcing element according to the invention.
  • the element has the shape of an open loop bent off at its closed end into a transverse foot 17, while the free ends of the loop are bent downwards and backwards to form two separate feet 21 extending in spaced parallel relation to the longitudinal sides 18 of the reinforcing element.
  • the feet 17 and 21 are tied to the bottom reinforcement.
  • the feet at the free ends of the loop can be formed otherwise than as shown in FIGURE 2, in that they may be bent away from each other, for example.
  • FIGURE 3 illustrates the possibility, in top-edge reinforcing a concrete slab above an intermediate supporting or spine wall, of using pairs of relatively overlapping, comparatively short reinforcing elements 16.
  • FIGURE 4 illustrates a similar arrangement with reinforcing elements overlapping in pairs over a longer portion of the length of the longitudinally extending sides.
  • FIGURE 5 shows reinforcing elements which, in addi tion to the bent-off foot-portions 17 at their ends, are provided intermediate their ends with supports formed by bending each longitudinally extending rod portion 16 into an elongated loop 23 having its overlapping portions in close proximity to each other.
  • FIGURE 6 illustrates a suitable disposition of the reinforcing elements according to the invention adjacent to an external supporting wall
  • FIGURES 7 and 8 show suitable arrangements thereof above a supporting column.
  • FIGURE 9 shows a modified form of the reinforcing element of the invention.
  • This element being in the shape of a closed rectangle, is bent off into a foot at one end of the rectangle only.
  • the figure illustrates a plurality of such reinforcing elements disposed across the top of a concrete joist to be cast integrally with the concrete floor.
  • the reinforcement for this joist is indicated at 24.
  • reinforcing elements of the invention are supported at their bent-off ends on the bottom reinforcement (not shown) for the concrete-floor slab to be cast, whereas the elements are supported near their opposite ends on the reinforcement for the joist.
  • FIGURE 10 shows a suitable disposition of reinforcing elements of the same configuration as those of FIGURE 9 adjacent a construction joint in the floor to be cast.
  • the reinforcing elements are supported at their straight ends on a mould board 25 temporarily placed on an edge on the mould bottom 10 and intended to be removed after the floor slab to the right of said board has been cast.
  • a method of reinforcing concrete floors and other substantially horizontally-extending, self-supporting concrete structures, having an upper surface and a lower surface comprising:
  • a structure in accordance with claim 6 which additionally includes tie wires fastening the foot of the loop to the rods.
  • a reinforcing element for reinforcing the top of concrete floors and other substantially horizontally-extending, self-supporting concrete structure comprising: a rectangular, continuous steel loop of substantial width, having at least one end thereof bent downwardly to provide vertical legs and a support foot of substantial length formed by the end of the rectangle, said support foot being in a plane parallel to and spaced from the plane of the sides of said rectangle.
  • a reinforcing element in accordance with claim 8 wherein at least one secondary, vertically-disposed, rectangular loop is formed by a side of said main loop and has a vertical height equal to the spacing between the two parallel planes so that one side of the secondary loop is in one plane and the other side of the secondary loop is in the other plane.
  • FRANK L. ABBOTT Primary Examiner.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
US332447A 1963-01-09 1963-12-23 Method of reinforcing concrete floors and the like, and a reinforcing element therefor Expired - Lifetime US3302360A (en)

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SE21463 1963-01-09

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US (1) US3302360A (da)
AT (1) AT256401B (da)
CH (1) CH418583A (da)
DK (1) DK110205C (da)
GB (1) GB1010676A (da)
NL (1) NL6400104A (da)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475876A (en) * 1966-08-23 1969-11-04 Georgi Oroschakoff Staggered reinforcement for concrete structures
US3693311A (en) * 1965-11-12 1972-09-26 Sven Erik Bjerking Reinforcement elements for concrete structures
US3914915A (en) * 1968-12-05 1975-10-28 Baustahlgewebe Gmbh Reinforcing mat structure for planar concrete construction units
US3994436A (en) * 1974-06-13 1976-11-30 Sonneville Roger P Composite railway tie
US4539787A (en) * 1981-11-20 1985-09-10 Avi Alpenlandische Veredelungs-Industrie Gesellschaft M.B.H. Reinforcement mat for reinforced concrete
AU596444B2 (en) * 1986-08-29 1990-05-03 Arthur William Shepherd Reinforcement mesh
US20060185280A1 (en) * 2004-05-11 2006-08-24 Plastedil S.A. Load bearing construction element, in particular for manufacturing building floors, and floor structure incorporating such element
US20110083386A1 (en) * 2009-04-03 2011-04-14 F.J. Aschwanden Ag Reinforcement element for absorbing forces of concrete slabs in the area of support elements
US20120205515A1 (en) * 2011-02-15 2012-08-16 F.J. Aschwanden Ag Reinforcement element for absorbing forces in concrete elements which are supported by support elements
US20190032336A1 (en) * 2016-07-15 2019-01-31 Richard P. Martter Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US20190078314A1 (en) * 2017-09-11 2019-03-14 Ruentex Engineering & Construction Co., Ltd. Method for forming a plurality of beams connected in series
US11220822B2 (en) 2016-07-15 2022-01-11 Conbar Systems Llc Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US12551032B2 (en) 2024-06-18 2026-02-17 Kaprock Management Llc Shelving unit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH642131A5 (en) * 1981-01-19 1984-03-30 Fischer Draht Ag Connection cage for reinforcing reinforced-concrete structures and the use thereof
FR2506368A1 (fr) * 1981-05-21 1982-11-26 Pittau Jean Claude Panneau assemble pour armature superieure en chapeau de dalles de beton arme, notamment pour la stabilite au feu
GB2200667A (en) * 1987-02-04 1988-08-10 Frank Johnson Floor and wall separation restraints
CH686686A5 (de) * 1993-03-26 1996-05-31 Tobler Stahlbau Ag Stuetzenkopfverstaerkung.
ES2389563T3 (es) * 2006-12-14 2012-10-29 F.J. Aschwanden Ag Elemento de armadura para la absorción de fuerzas en placas hormigonadas en el sector de elementos de apoyo

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT55914B (de) * 1909-10-30 1912-10-25 Eduard Steiner Aus einem Stück Eisendraht, Stabeisen oder dgl. bestehende, freistehende Eiseneinlage für Eisenbetonkonstruktionen.
US1182421A (en) * 1913-08-25 1916-05-09 William E Ramsey Concrete floor construction.
US1244641A (en) * 1915-03-19 1917-10-30 Walter M Pratt Reinforced-concrete floor construction.
US1335780A (en) * 1920-04-06 Conobete building
US1625899A (en) * 1923-05-17 1927-04-26 Lally John Fireproof building construction
US1693941A (en) * 1921-12-09 1928-12-04 Karl R Schuster Building construction
US2140313A (en) * 1937-10-28 1938-12-13 Dellenbarger Metal stud and joist

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1335780A (en) * 1920-04-06 Conobete building
AT55914B (de) * 1909-10-30 1912-10-25 Eduard Steiner Aus einem Stück Eisendraht, Stabeisen oder dgl. bestehende, freistehende Eiseneinlage für Eisenbetonkonstruktionen.
US1182421A (en) * 1913-08-25 1916-05-09 William E Ramsey Concrete floor construction.
US1244641A (en) * 1915-03-19 1917-10-30 Walter M Pratt Reinforced-concrete floor construction.
US1693941A (en) * 1921-12-09 1928-12-04 Karl R Schuster Building construction
US1625899A (en) * 1923-05-17 1927-04-26 Lally John Fireproof building construction
US2140313A (en) * 1937-10-28 1938-12-13 Dellenbarger Metal stud and joist

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693311A (en) * 1965-11-12 1972-09-26 Sven Erik Bjerking Reinforcement elements for concrete structures
US3475876A (en) * 1966-08-23 1969-11-04 Georgi Oroschakoff Staggered reinforcement for concrete structures
US3914915A (en) * 1968-12-05 1975-10-28 Baustahlgewebe Gmbh Reinforcing mat structure for planar concrete construction units
US3994436A (en) * 1974-06-13 1976-11-30 Sonneville Roger P Composite railway tie
US4539787A (en) * 1981-11-20 1985-09-10 Avi Alpenlandische Veredelungs-Industrie Gesellschaft M.B.H. Reinforcement mat for reinforced concrete
AU596444B2 (en) * 1986-08-29 1990-05-03 Arthur William Shepherd Reinforcement mesh
US20060185280A1 (en) * 2004-05-11 2006-08-24 Plastedil S.A. Load bearing construction element, in particular for manufacturing building floors, and floor structure incorporating such element
US7784235B2 (en) * 2004-05-11 2010-08-31 Plastedil S.A. Load bearing construction element, in particular for manufacturing building floors, and floor structure incorporating such element
US20110083386A1 (en) * 2009-04-03 2011-04-14 F.J. Aschwanden Ag Reinforcement element for absorbing forces of concrete slabs in the area of support elements
US8752347B2 (en) * 2009-04-03 2014-06-17 F.J. Aschwanden Ag Reinforcement element for absorbing forces of concrete slabs in the area of support elements
US20120205515A1 (en) * 2011-02-15 2012-08-16 F.J. Aschwanden Ag Reinforcement element for absorbing forces in concrete elements which are supported by support elements
US8516757B2 (en) * 2011-02-15 2013-08-27 F.J. Aschwanden Ag Reinforcement element for absorbing forces in concrete elements which are supported by support elements
US20190032336A1 (en) * 2016-07-15 2019-01-31 Richard P. Martter Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US10633860B2 (en) * 2016-07-15 2020-04-28 Conbar Systems Llc Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US11220822B2 (en) 2016-07-15 2022-01-11 Conbar Systems Llc Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US11788289B2 (en) 2016-07-15 2023-10-17 Conbar Systems Llc Reinforcing assemblies having downwardly-extending working members on structurally reinforcing bars for concrete slabs or other structures
US20190078314A1 (en) * 2017-09-11 2019-03-14 Ruentex Engineering & Construction Co., Ltd. Method for forming a plurality of beams connected in series
US10808393B2 (en) * 2017-09-11 2020-10-20 Ruentex Construction & Engineering Co., Ltd. Method for forming a plurality of beams connected in series
US12551032B2 (en) 2024-06-18 2026-02-17 Kaprock Management Llc Shelving unit

Also Published As

Publication number Publication date
NL6400104A (da) 1964-07-10
DK110205C (da) 1970-12-14
GB1010676A (en) 1965-11-24
CH418583A (de) 1966-08-15
AT256401B (de) 1967-08-25

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