Classifications

• • 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
  • E04C5/012—Discrete reinforcing elements, e.g. fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
  • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
  • B21G3/00—Making pins, nails, or the like
  • B21G3/12—Upsetting; Forming heads
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
  • B21G3/00—Making pins, nails, or the like
  • B21G3/18—Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16
  • B21G3/30—Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16 by rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
  • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
• • 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
  • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete

Definitions

• the present invention relates to filiform elements, called fibers, which can be used for reinforcing moldable materials with a binder of the hydraulic type or not.
• fiber reinforcement provides an increase in the breaking energy of the composite material compared to the brittle matrix material.
• the increase in energy required for breaking corresponds to the energy required for lengthening and breaking the fibrous reinforcement.
• the behavior of the fiber depends on the behavior of the hooks in the matrix.
• Fibers with sinusoidal undulations distributed over their entire length are again much lower than the breaking energy by traction of the fiber; the number of undulations along a fiber does not compensate for the too large radius of curvature of each undulation.
• the matrix can be sheared by the flattened parts, which results in harmful loosening.
• the breaking energy of the composite material would be that of the fragile matrix, increased by that of the fibrous reinforcement.
• the present invention relates to a steel fiber for example, intended to reinforce a matrix material, concrete for example by never removing shoes from it, neither because of the fiber itself, nor because of the matrix by rupture of this one in the vicinity of the anchoring.
• the reinforcing fiber comprises at each end according to the invention an anchoring device consisting of one or more volumes of any shape whose all transverse dimensions are greater than the diameter of the filiform body.
• the anchoring device can be formed at each end of a single volume called head, which can have a shape which is more and more swollen towards the ends of the fiber and even have a part with symmetry of revolution.
• the generating curve of this solid of revolution can be such that the intersection of the tangent at any point of this curve with the external lateral surface of the filiform body of the fiber is always in the very volume of the head; the heads can however also be partly or entirely of cylindrical shape.
• the desired fiber must have a filiform body provided at each of its ends with a head whose internal part, that is to say the part in contact with the filiform body, is of solid form of revolution such that the angle between the tangent at any point of the generating curve and the axis of the filiform body has a maximum value between 20 and 60 °.
• the value of this angle will depend, to obtain the ideal behavior, on the nature of the material constituting the fiber.
• steel for increasingly weak mechanical qualities requires increasingly higher head angles and for increasingly high mechanical qualities requires increasingly weak head angles.
• the filiform elements called "fibers” described above can be manufactured by the use of several methods.
• a filiform element of indefinite length with a diameter equal to the largest transverse dimension of the head is subjected, by passage between a couple of rolling rolls grooves, the grooves of which are provided with notches spaced apart from each other , a reduction of dia meter over its entire length except that heads are formed at the locations of the notches cut along the grooves of the rolling rolls.
• the next step in this process is to regularly cut the continuous filamentary element laminated so as to produce fibers of precise length provided at each end with a head.
• Another process is carried out by striking a hammer on each end of a threadless element, without a head, having a diameter equal to that of the fiber body, each end being held during striking by a matrix so as to obtain a head of desired shape.
• a third process is carried out by forming a drop at the ends of the filiform body at a temperature close to the melting point of the constituent material. After this forming, it can be quenched to improve the mechanical qualities of the fiber.
• FIG. 8 shows in front view the pair of cylinders of Figure 6A
• the wound wire generally designated by the reference notation 1 is drawn towards a rolling apparatus 2 made up of a pair of fluted rolling cylinders regularly provided over their length with matrix notches of the fiber heads of which Figures 7 and 8 give an example of reducing the diameter of the wire as a base material to the diameter of the filiform body of the fiber except at the location of the heads of these fibers.
• This rolling apparatus 2 provides a wire of diameter smaller than the initial diameter and provided with regular spacing of swellings.
• the shearing device 4 cuts the wire thus obtained at mid-volume of each swelling to create the fibers provided with their heads.
• the wound wire generally designated by the reference notation 1 is pulled towards a shearing apparatus producing straight filiform elements 6 of short constant length which must be gripped individually, pliers at their ends between two dies, as in figure 9, generating with the help of hammers striking the desired heads in their exact form.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Ropes Or Cables (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Reinforcement Elements For Buildings (AREA)
• Reinforced Plastic Materials (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Nonwoven Fabrics (AREA)
• Rod-Shaped Construction Members (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3843542

Family Applications (1)

Country Status (6)

Families Citing this family (16)

Citations (9)

• 1983
  • 1983-06-30 JP JP58502222A patent/JPS59501220A/ja active Granted
  • 1983-06-30 AT AT83870069T patent/ATE25727T1/de not_active IP Right Cessation
  • 1983-06-30 WO PCT/BE1983/000014 patent/WO1984000186A1/fr unknown
  • 1983-06-30 DE DE8383870069T patent/DE3370041D1/de not_active Expired
  • 1983-06-30 EP EP83870069A patent/EP0098825B1/fr not_active Expired
• 1984
  • 1984-02-24 DK DK101484A patent/DK152935C/da not_active IP Right Cessation

Patent Citations (9)

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