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EP0744511A1 - Spannbetonträger, sowie Verfahren zu seiner Herstellung - Google Patents

Spannbetonträger, sowie Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0744511A1
EP0744511A1 EP96401126A EP96401126A EP0744511A1 EP 0744511 A1 EP0744511 A1 EP 0744511A1 EP 96401126 A EP96401126 A EP 96401126A EP 96401126 A EP96401126 A EP 96401126A EP 0744511 A1 EP0744511 A1 EP 0744511A1
Authority
EP
European Patent Office
Prior art keywords
steels
height
central part
prestressed concrete
stuffing
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.)
Granted
Application number
EP96401126A
Other languages
English (en)
French (fr)
Other versions
EP0744511B1 (de
Inventor
Paul Savard Chambard
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.)
RECTOR SA
Original Assignee
RECTOR 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 RECTOR SA filed Critical RECTOR SA
Publication of EP0744511A1 publication Critical patent/EP0744511A1/de
Application granted granted Critical
Publication of EP0744511B1 publication Critical patent/EP0744511B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • 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
    • 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
    • E04C5/065—Light-weight girders, e.g. with precast parts

Definitions

  • the present invention relates generally to concrete beams and more particularly beams for the production of floors.
  • the beams used for making floors are prestressed concrete beams, that is to say beams in which steel wires are under tension.
  • This first type of beam provides a structure with high flexural strength.
  • the invention seeks to propose a beam meeting this demand.
  • the invention relates to a prestressed concrete beam characterized in that it has a central part of height e2 and end parts of height el less than e2, so as to be more resistant in its central part, said central part being the zone in which the bending moment has its maximum value when the beam is loaded, whether punctually or distributed.
  • the present invention also relates to a method of manufacturing such a beam characterized in that there is a stuffing in the end parts of a mold in a single piece not opening usually used for the manufacture of prestressed concrete beams .
  • Said stuffing can be carried out in any suitable manner.
  • a pulverulent material such as sand or consist of a block of polystyrene split in the middle. It can also consist of a profile made of a flexible material such as neoprene, polypropylene or the like, or of a cardboard profile.
  • a beam P arranged on two remote supports 2 and supporting loads is subjected to stresses which we are used to evaluate from the curves M of the bending moment and T of the shear forces.
  • FIGS 1a to 1c show these curves M and T for different loading of said beam P.
  • the invention then proposes a beam such as the beams 1a and 1b shown in Figures 2a and 2b, that is to say a beam whose height varies between e2 in the central part A, A 'and e1 less than e2 in the end portions B, B '.
  • the beam 1a, 1b is thus more resistant in its central part A, A 'of significant thickness e2 which is the zone in which the bending moment takes its most important values.
  • a beam for the production of floors has a base or heel 10 and an upper part 11.
  • This upper part 11 is usually of trapezoidal section with the small base at the top as shown. in solid lines but can also be rectangular as shown in dotted lines or in trapezoidal section with the small base at the bottom as shown in dashed lines.
  • the heel 10 is wider and less high than the upper part 11.
  • the interjoists 6, visible in FIGS. 3a and 3b, are supported by their spoiler on the shoulders 12 formed on either side of the upper part 11.
  • Prestressing steels 3 are embedded in the beam, some being placed in the heel 10 and others near the bottom of the upper part 11.
  • Figure 4 is a section of the beam according to the invention, in the central part A thereof, for which it is similar to known prestressed concrete beams.
  • the height el of this end part B is much less than the height e2 of the central part A.
  • this height e1 is slightly greater than half of the height e2 while in FIGS. 8 and 9, said height el is approximately equal to two thirds of the height e2.
  • reinforcements of shear forces 4 are provided in these parts. end.
  • the beam according to the invention with central parts and ends of different heights e2 and e1 also has the great advantage of facilitating the positioning of steels of sharp forces and of stitching 4.
  • the seam steels 4 extend in the space left free above the end parts B, without exceeding the overall height of the central part A .
  • This arrangement of steels of cutting forces and sewing in the overall height of the central part A also makes it possible not to disturb the stacking of the beams according to the invention which can be carried out in the usual way by interposing simple separating wedges.
  • Another advantage provided by the beams according to the invention when their end portions B are provided with cutting force and sewing steels is that of being able to be easily transported, these steels allowing their manual setting as well as their attachment to lifting gear.
  • the cutting force and sewing steels 4 can be of any known shape.
  • Figures 5 and 10 show alternative embodiments using steels of sharp forces and sewing in the form of simple Greek that is to say in the form of a succession of U arranged alternately upward and toward the low.
  • the cutting and sewing steels can, as desired, be arranged on one side or the other of the prestressed steels.
  • FIGS. 6 and 12 show steels of shearing forces and of sewing in the form of a stiffener and FIG. 7 shows a beam with steel of shearing forces and of sewing made up of a flat stiffener.
  • the length of the end zones of thickness e1 less than the thickness of the central part can vary depending on the use to which the beam is intended, it is usually between a few tens of centimeters and a third the length of the beam and never less than 20 cms.
  • the lengths of the central part A and the end parts B of a beam are determined by the location of the loads that the beam will have to bear.
  • the ends B of height e1 have a reduced length, for example between 20 and 50 centimeters.
  • the resistance to bending moments of the beam according to the invention is, if necessary, greatly improved by embedding in the central part A thereof steels shaped in the same way as the steels provided in the end portions B.
  • the beam according to the invention thus makes it possible, by calculating the characteristics of the steels embedded in the central part A and of the steels put in place on the end parts B, to modulate the resistance of the beam at the time of bending and to shear forces and multiply it by 1.5 to 2.
  • a beam with end portions each extending over a third of the total length meets the criteria imposed by the anti-seismic regulations for zones II and III.
  • the beams having intermediate lengths with respect to these extreme dimensions are manufactured according to the loads they have to withstand.
  • the present invention also relates to a method of manufacturing beams according to the invention.
  • a beam with a weight of the order of 20 kilograms per linear meter can, by improving the molding precision, weigh only 1.5 kilograms per linear meter.
  • the beams with end portions of height less than the central part and provided with steels of cutting forces and sewing are produced in molds in a single piece not opening usually used for the manufacture of beams in Prestressed concrete.
  • a stuffing for example in a pulverulent material such as sand is placed in the end portions of the mold so as to reduce the molding cavity and to allow the sinking of the seam steels to ensure their positioning.
  • the stuffing can also be achieved by a block of polystyrene split in the middle or a profile of flexible material such as neoprene, polypropylene, ... or a cardboard profile, in the case of steels extending in a vertical plane , for example those in the form of Greek.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP96401126A 1995-05-24 1996-05-24 Spannbetonträger, sowie Verfahren zu seiner Herstellung Expired - Lifetime EP0744511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9506183A FR2734588B1 (fr) 1995-05-24 1995-05-24 Poutrelle en beton precontraint et son procede de fabrication
FR9506183 1995-05-24

Publications (2)

Publication Number Publication Date
EP0744511A1 true EP0744511A1 (de) 1996-11-27
EP0744511B1 EP0744511B1 (de) 2003-02-12

Family

ID=9479333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401126A Expired - Lifetime EP0744511B1 (de) 1995-05-24 1996-05-24 Spannbetonträger, sowie Verfahren zu seiner Herstellung

Country Status (4)

Country Link
EP (1) EP0744511B1 (de)
AT (1) ATE232570T1 (de)
DE (1) DE69626150D1 (de)
FR (1) FR2734588B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102808372A (zh) * 2012-08-20 2012-12-05 杨众 一种简支的预制整浇叠合桥梁及施工方法
FR2998910A1 (fr) * 2012-12-04 2014-06-06 Sofrema Armature passive superieure pour poutrelles coulees a l'envers et destinees a des planchers sans etaiement
CN104718332A (zh) * 2012-09-05 2015-06-17 韩国建设技术研究院 抗冲切用增强构件以及采用该增强构件的支柱与板和扩大基础之间的结合部的施工方法
WO2018117876A1 (en) * 2016-12-19 2018-06-28 Kopalnia Kruszyw Zbrody 1 Sp. Z O.O. Sp .K. Prefabricated roof joist

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191221383A (en) * 1911-09-19 1913-04-17 Fritz Edlen Von Emperger Improvements in Reinforced Concrete Elements for Building Constructions of any kind.
US1465307A (en) * 1920-11-29 1923-08-21 Richard C Keogan Reenforced-concrete beam
FR896405A (fr) * 1940-11-25 1945-02-21 Wayss & Freytag A G Poutre en béton armé avec armature préalablement tendue
US2435998A (en) * 1943-03-31 1948-02-17 Porete Mfg Company Composite prestressed concrete beam and slab structure
FR988851A (fr) * 1944-01-20 1951-09-03 Sainrapt & Brice Ets Pièces en béton précontraint et leur procédé d'obtention
FR1098393A (fr) * 1954-04-13 1955-07-25 élément de construction armé et muni, de préférence, d'un corps de remplissage isolant pour la chaleur et le son
FR1270049A (fr) * 1960-07-11 1961-08-25 Poutre, ou élément de construction analogue, en béton armé
FR1589789A (de) * 1968-10-22 1970-04-06
FR2403431A1 (fr) * 1977-09-14 1979-04-13 Costamagna & Cie B M Perfectionnements aux poutrelles en beton precontraint
FR2436660A1 (fr) * 1978-09-20 1980-04-18 Costamagna & Cie B M Perfectionnements aux moules de banc de precontrainte

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191221383A (en) * 1911-09-19 1913-04-17 Fritz Edlen Von Emperger Improvements in Reinforced Concrete Elements for Building Constructions of any kind.
US1465307A (en) * 1920-11-29 1923-08-21 Richard C Keogan Reenforced-concrete beam
FR896405A (fr) * 1940-11-25 1945-02-21 Wayss & Freytag A G Poutre en béton armé avec armature préalablement tendue
US2435998A (en) * 1943-03-31 1948-02-17 Porete Mfg Company Composite prestressed concrete beam and slab structure
FR988851A (fr) * 1944-01-20 1951-09-03 Sainrapt & Brice Ets Pièces en béton précontraint et leur procédé d'obtention
FR1098393A (fr) * 1954-04-13 1955-07-25 élément de construction armé et muni, de préférence, d'un corps de remplissage isolant pour la chaleur et le son
FR1270049A (fr) * 1960-07-11 1961-08-25 Poutre, ou élément de construction analogue, en béton armé
FR1589789A (de) * 1968-10-22 1970-04-06
FR2403431A1 (fr) * 1977-09-14 1979-04-13 Costamagna & Cie B M Perfectionnements aux poutrelles en beton precontraint
FR2436660A1 (fr) * 1978-09-20 1980-04-18 Costamagna & Cie B M Perfectionnements aux moules de banc de precontrainte

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102808372A (zh) * 2012-08-20 2012-12-05 杨众 一种简支的预制整浇叠合桥梁及施工方法
CN104718332A (zh) * 2012-09-05 2015-06-17 韩国建设技术研究院 抗冲切用增强构件以及采用该增强构件的支柱与板和扩大基础之间的结合部的施工方法
CN104718332B (zh) * 2012-09-05 2017-03-08 韩国建设技术研究院 抗冲切用增强构件以及施工方法
FR2998910A1 (fr) * 2012-12-04 2014-06-06 Sofrema Armature passive superieure pour poutrelles coulees a l'envers et destinees a des planchers sans etaiement
WO2018117876A1 (en) * 2016-12-19 2018-06-28 Kopalnia Kruszyw Zbrody 1 Sp. Z O.O. Sp .K. Prefabricated roof joist

Also Published As

Publication number Publication date
FR2734588A1 (fr) 1996-11-29
FR2734588B1 (fr) 1997-07-11
EP0744511B1 (de) 2003-02-12
ATE232570T1 (de) 2003-02-15
DE69626150D1 (de) 2003-03-20

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