EP0606794A1 - Verfahren zum Herstellen von Trägern aus vorgespanntem Beton, Einrichtung zur Durchführung des Verfahrens und nach dem Verfahren hergestellter Träger - Google Patents

Verfahren zum Herstellen von Trägern aus vorgespanntem Beton, Einrichtung zur Durchführung des Verfahrens und nach dem Verfahren hergestellter Träger Download PDF

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Publication number
EP0606794A1
EP0606794A1 EP93403040A EP93403040A EP0606794A1 EP 0606794 A1 EP0606794 A1 EP 0606794A1 EP 93403040 A EP93403040 A EP 93403040A EP 93403040 A EP93403040 A EP 93403040A EP 0606794 A1 EP0606794 A1 EP 0606794A1
Authority
EP
European Patent Office
Prior art keywords
stirrups
formwork
open
reinforcements
concrete
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.)
Withdrawn
Application number
EP93403040A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Carbonari
Pierre Kaliszwsky
Jéròme Laurent
Jean Roux
Alain Sanda
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.)
Saret France (sa)
Original Assignee
Saret France (sa)
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
Application filed by Saret France (sa) filed Critical Saret France (sa)
Publication of EP0606794A1 publication Critical patent/EP0606794A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • B28B1/0935—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material using only elements wholly or partly immersed in the material, e.g. cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
    • B28B7/0035—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding
    • B28B7/0044—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding the sidewalls of the mould being only tilted away from the sidewalls of the moulded article, e.g. moulds with hingedly mounted sidewalls
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed

Definitions

  • the invention relates to the manufacture of prestressed concrete beams of the type comprising longitudinal prestressing reinforcements and transverse stirrups.
  • the reinforcements are positioned in the formwork by means of what are called combs, that is to say transverse plates pierced with holes arranged for the positioning of the reinforcements which has been calculated for beam.
  • This long and painful preparatory work because it is necessary to thread the reinforcements in the holes and to distribute the combs along the length next to the formwork, is further complicated by the introduction of the stirrups, which are closed, around the group of reinforcements. It is only after this preparatory phase that all of the reinforcement is gradually lowered into the formwork. It is still necessary to provide clamping pieces to hold the combs.
  • the beams manufactured by this known process have in besides various disadvantages.
  • the vibration is carried out externally on the formwork, which does not ensure optimum efficiency and is also a generator of noise which makes manufacturing even more painful.
  • the introduction of the concrete being made above the formwork the concrete is aerated upon contact with the stirrups, this excess air then having to be evacuated.
  • the upper face of the beam is difficult to erect and, moreover, it is practically impossible with the current closed stirrups to provide it with a notch, an advantage which would, according to the regulations in force, greatly reduce the number of stirrups.
  • the present invention aims to provide a new method for manufacturing prestressed concrete beams comprising longitudinal prestressing reinforcements and transverse stirrups, in a formwork comprising at least one pivoting side wall.
  • the method according to the invention is characterized in that the side walls of the formwork are closed, a plurality of transverse stirrups open at their upper part are deposited in the formwork, placing spacers in the formwork at the height of the reinforcements, a plurality of reinforcements are simultaneously pulled in the formwork inside the openings of the stirrups, the said reinforcements are cut and keyed at the ends, then they are tensioned, then deposited in abutment on the upper face of the formwork, a plurality of combs each consisting of a support plate carrying several profiles for transverse distribution of the reinforcements, the side walls of the formwork and said combs are blocked, the stirrups are fixed, any inserts are put in place and fixed , the concrete is poured into the formwork by means of a skip with regulated flow, the concrete is vibrated internally by means of vibrating needles using for example the of a motorized carriage supporting the needles which are introduced into the openings of the stirrups, the top of the
  • stirrups open at their upper part which are shaped so as to transmit to concrete all of the admissible forces of the reinforcement.
  • This configuration of the stirrups allows their prior installation in the formwork, followed by easy installation of the longitudinal reinforcement.
  • the subsequent installation of the combs is facilitated by their shape with vertical slots and the reference point on the upper part of the formwork.
  • the open stirrups also allow easy distribution of the concrete inside the formwork then the passage of vibrating needles allowing direct and optimal vibration of the concrete and a significant reduction in noise, as well as a significant improvement in the quality of the concrete. and the facing of the finished beam.
  • the stirrups are of continuous sinusoidal shape.
  • the stirrups are open U-shaped terminated by inking in the form of lyres, sticks or flattened buttons and are joined in groups by longitudinal mounting irons.
  • the sticks, lyres or buttons are anchored in the floor in the case of a beam with collaborating floor.
  • the formwork combs for beam ends are formed by tubes covered by flexible striated sleeves.
  • the invention provides for the use of spacers for heightening the reinforcements, arranged between the concrete beams to be manufactured, and made up of profiles secured to a base and carrying lateral notches which allow easy positioning of the reinforcements.
  • the invention also relates to an installation for implementing the method and the beams obtained by the preceding method.
  • the formwork shown schematically in Figure 1 has side walls 1 and 2 pivoting laterally and a fixed central assembly 3 providing two formwork volumes 4 and 5 which can reach a length of 80 to 120 meters for the manufacture of prestressed concrete beams.
  • the upper edges of each wall 1, 2 carry longitudinal rails 6 and 7 respectively while the assembly 3 carries longitudinal rails 8, 9.
  • the pivoting of the side walls 1, 2 is controlled in a conventional manner for formwork removal and the preparation of formwork.
  • the lateral crosspieces of the formwork further carry guide plates 66, 67 whose role will be explained later with reference to FIG. 17.
  • a first embodiment ( Figure 2) is made by a metal wire 10 folded in a sinusoidal form, the upper folds 11 being longitudinal while the lower folds 12 are transverse, possibly oblique.
  • the assembly thus forms a plurality of transverse stirrups, the relative spacing of which can be adjusted by deformation of the wire 10, in order to position them in the concrete according to a distribution of preliminary calculation made at the design office.
  • the installation of this set is simple but its complex manufacturing.
  • stirrups 20 (FIGS. 3 to 10) connected in groups by means of welded longitudinal mounting bars 21 which form cages of pre-assembled reinforcements.
  • the ends of the stirrups 20 can be provided with curved brackets or lyres 22 ( Figures 3 to 9) or buttons 23 ( Figure 10).
  • the stirrups 20 can be completely embedded in the beam 30 ( Figures 3 and 6), the ends 22 or 23 subsequently embedded in a floor 31 ( Figures 4, 9 and 10).
  • the ends 22, 23 can also project above the beam 30 (FIGS. 5, 7, 8).
  • Inverted stirrups 24 can be placed at the end of the manufacturing process to close the open stirrups 20 and / or anchor in the working floor 31, or placed in the form of pins 76 ( Figure 10) after manufacture of the beam .
  • the open stirrups 20 can be multiple side by side or nested laterally (Figure 7).
  • An important advantage of the invention consists in making it possible to preposition the groups of stirrups for distribution by a carriage, which greatly accelerates their installation.
  • spacers 40 are placed between the lengths of beams to bring the reinforcements up to height ( Figures 11 and 12).
  • the spacers 40 consist of tubes 41 integral with a base 42.
  • the end tubes 41 carry flat irons 43 projecting on both sides and provided with alternating equidistant notches 44 in the form of a coated T receiving an axis 75 allowing the longitudinal reinforcements 45 to be brought up to a fixed pitch.
  • the combs comprise tubes 50 (FIG. 13) integral with a plate 51 carrying a handle 52.
  • Flexible sleeves 53 (FIG. 14) are previously threaded on the tubes 50, and include grooves 54 to create an imprint in the concrete.
  • the frames 45 are thus trapped between two adjacent sleeves 53 ( Figure 15) and precisely positioned to ensure sealing around the frames 45 during concreting.
  • the combs are then blocked by means of locking devices shown in FIG. 16.
  • the locking device is formed by a first stirrup 60 provided with a closing stud 61 and by a second stirrup 62 mounted on a support 63 provided with a nozzle 64 for receiving the stud 61.
  • the closure is effected by a handle 65 with eccentric closure pivoting on the support 63, the stirrups 60 and 62 being supported on opposite edges of the plate 51 of the comb bearing on the rails 6, 8 or 7, 9.
  • the stirrups are then fixed to the frames 45 by means of staples.
  • the concrete can then be poured directly into the formwork thanks to the opening of the stirrups, for example by means of a concrete bucket of the screw type.
  • the concrete can be vibrated directly by vibrating needles 70 introduced into the concrete from above.
  • the vibrating needles 70 are carried by a motorized carriage 71 guided on the dishes 66 and 67 of the formwork.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP93403040A 1992-12-29 1993-12-15 Verfahren zum Herstellen von Trägern aus vorgespanntem Beton, Einrichtung zur Durchführung des Verfahrens und nach dem Verfahren hergestellter Träger Withdrawn EP0606794A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9215822A FR2699951B1 (fr) 1992-12-29 1992-12-29 Procédé de fabrication de poutres en béton précontraint et poutres obtenues par ce procédé.
FR9215822 1992-12-29

Publications (1)

Publication Number Publication Date
EP0606794A1 true EP0606794A1 (de) 1994-07-20

Family

ID=9437194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93403040A Withdrawn EP0606794A1 (de) 1992-12-29 1993-12-15 Verfahren zum Herstellen von Trägern aus vorgespanntem Beton, Einrichtung zur Durchführung des Verfahrens und nach dem Verfahren hergestellter Träger

Country Status (2)

Country Link
EP (1) EP0606794A1 (de)
FR (1) FR2699951B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388569A (en) * 2002-05-17 2003-11-19 Poundfield Products Ltd Prestressed concrete units and method of manufacture
FR2848589A1 (fr) * 2002-12-16 2004-06-18 Rector Sa Procede de fabrication de poutres en beton et installation mettant en oeuvre ledit procede

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7421907U (de) * 1974-06-27 1976-04-22 J. Reeh Ag, 6340 Dillenburg Schalvorrichtung für Betonträger
US4629408A (en) * 1985-09-06 1986-12-16 Arctic Equipment Rental, Inc. Portable concrete beam harping system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7421907U (de) * 1974-06-27 1976-04-22 J. Reeh Ag, 6340 Dillenburg Schalvorrichtung für Betonträger
US4629408A (en) * 1985-09-06 1986-12-16 Arctic Equipment Rental, Inc. Portable concrete beam harping system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388569A (en) * 2002-05-17 2003-11-19 Poundfield Products Ltd Prestressed concrete units and method of manufacture
GB2388569B (en) * 2002-05-17 2006-12-20 Poundfield Products Ltd Prestressed concrete units and method of manufacture
FR2848589A1 (fr) * 2002-12-16 2004-06-18 Rector Sa Procede de fabrication de poutres en beton et installation mettant en oeuvre ledit procede
EP1431015A1 (de) * 2002-12-16 2004-06-23 Rector S.A.S. Verfahren zur Herstellung von bewehrten Betonträgern und Einrichtung zur Durchführung dieses Verfahrens

Also Published As

Publication number Publication date
FR2699951B1 (fr) 1995-03-03
FR2699951A1 (fr) 1994-07-01

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