EP0744511B1 - Poutrelle en béton précontraint et son procédé de fabrication - Google Patents
Poutrelle en béton précontraint et son procédé de fabrication Download PDFInfo
- Publication number
- EP0744511B1 EP0744511B1 EP96401126A EP96401126A EP0744511B1 EP 0744511 B1 EP0744511 B1 EP 0744511B1 EP 96401126 A EP96401126 A EP 96401126A EP 96401126 A EP96401126 A EP 96401126A EP 0744511 B1 EP0744511 B1 EP 0744511B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- end parts
- filler
- steels
- height
- prestressed 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.)
- Expired - Lifetime
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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 joists for the production of floors.
- the beams used for making floors are concrete beams prestressed, i.e. beams in which steel wires are embedded under voltage. This first type of beam provides a structure whose flexural strength is important.
- the invention therefore seeks to propose a beam meeting this demand in making better use of the mechanical strength of concrete than before prestressed and sewing steels.
- the invention relates to a prestressed concrete beam with a heel, an upper part and prestressing steels embedded in the heel and at the bottom of the upper part, said heel being wider and less high than said part upper, characterized in that the end portions of the beam are tall e1 less than the height e2 of the central part of the beam and have a length between a few tens of centimeters and about 1/3 of the length of the beam and in that shear reinforcement is provided in said end parts, said shear reinforcement extending in the space left free above said end parts without exceeding the bulk of the part Central.
- 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 non-opening one-piece mold usually used for the manufacture of prestressed concrete beams.
- a beam P arranged on two distant supports 2 and bearing loads is subject to constraints which we are used to evaluating from 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 FIGS. 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 there, 1b is thus more resistant in its central part A, A 'of significant thickness e2 which is the area in which the bending moment takes its values the more important.
- 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 trapezoidal section with the small base at the bottom like shown in dashed lines. Heel 10 is wider and lower than the top 11.
- the interjoists 6, visible in FIGS. 3a and 3b, are in support by their spoiler on the shoulders 12 formed of on either side of the upper part 11.
- Prestressing steels 3 are embedded in the beam, some being arranged in the heel 10 and others near the bottom of the top 11.
- Figure 4 is a section of the following beam the invention, in the central part A thereof, for which it is similar to beams in known prestressed concrete.
- the height e1 of this end portion B is significantly less than the height e2 of the central part A.
- this height e1 is a little greater than half the height e2 while at Figures 8 and 9, said height e1 is approximately equal to two thirds of the height e2.
- shear reinforcement 4 are provided in these end portions.
- the beam according to the invention with parts central and extremities of heights e2 and e1 different has the great advantage of facilitate the implementation of effort steels sharp and sewing 4.
- the seam steels 4 extend in the space left free above the end parts B, without exceeding the overall height of the part central A.
- This arrangement of steels of sharp forces and seam in the overall height of the part control unit A also makes it possible not to disturb the stack of beams according to the invention which are can perform in the usual way by interleaving simple separating wedges.
- beams provide the invention when their end portions B are fitted with cutting force steels and east seam that of being able to be easily transported, these steels allowing both their manual setting and their attachment to lifting devices.
- Sharp and seam steels 4 can be of any known form.
- Figures 5 and 10 show variants of realization using effort steels sharp and stitching in the form of simple Greek that is to say in the form of a succession of U arranged alternately up and down.
- the stress steels cutting and sewing can be arranged on one side or the other of the steels prestressed.
- Figures 6 and 12 show stress steels sharp and stitched in the form of stiffener and the figure 7 shows a beam with efforts steel sharp and sewn formed as 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 intended for the beam, it is usually understood between a few tens of centimeters and a third of the length of the beam and never less than 20 cms.
- the lengths of the central part A and the parts end B of a beam are determined by the location of the loads to be borne by the beam.
- 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, largely improved by drowning in the central part A of it steels shaped in the same way as the steels provided in the end parts B.
- the beam according to the invention thus allows, in calculating the characteristics of steels embedded in the central part A and steels in place on the end parts B to modulate the resistance of the beam at bending moment and efforts sharp 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 regulations earthquake-proof for zones II and III.
- Beams with intermediate lengths compared to these extreme dimensions are as to they manufactured according to the loads to which they must resist.
- the present invention also relates to a method of manufacture of the 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 15 kilograms per linear meter.
- the beams with parts ends of height less than the central part and fitted with cutting and sewing steels are made in molds in one piece not opening usually used for the manufacture of prestressed concrete beams.
- a jam for example in a powdery material such that sand is placed in the end parts of the mold so as to reduce the mold cavity and 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 in flexible material such as neoprene, polypropylene, ... or a cardboard profile, in the case steels extending in a vertical plane, by 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)
Description
- la longueur des parties d'extrémités (B) est au moins de 20 centimètres.
- la résistance aux moments de flexion est, en cas de besoin, largement améliorée en noyant dans la partie centrale des aciers conformés de la même manière que ceux disposés dans les parties d'extrémités.
- les figures 1a, 1b et 1c sont des schémas représentant le moment de flexion Ma, Mb et l'effort tranchant Ta, Tb, Tc supportés par une poutrelle disposée sur deux appuis pour différentes formes de charge,
- les figures 2a et 2b représentent schématiquement deux poutrelles selon l'invention,
- les figures 3a et 3b représentent schématiquement des montages avec table de compression incorporée respectivement avec une poutrelle en béton précontraint de type connu 3a et avec une poutrelle en béton précontraint suivant l'invention 3b,
- la figure 4 est une coupe réalisée dans la partie centrale d'une poutrelle suivant l'invention,
- les figures 5 à 9 sont des coupes réalisées dans une partie d'extrémité d'une poutrelle selon l'invention pour cinq variantes de réalisation,
- la figure 10 est une vue en perspective de la poutrelle de la figure 5,
- les figures 11 et 12 sont des vues partielles en perspective d'une poutrelle suivant l'invention, la poutrelle représentée à la figure 12 étant celle vue en coupe à la figure 7.
Claims (8)
- Poutrelle en béton précontraint présentant un talon (10), une partie supérieure (11) et des aciers de précontrainte (3) noyés dans le talon (10) et dans le bas de la partie supérieure (11), ledit talon (10) étant plus large et moins haut que ladite partie supérieure (11), caractérisée en ce que les parties d'extrémités (B) de la poutrelle sont de hauteur e1 inférieure à la hauteur e2 de la partie centrale (A) de la poutrelle et ont une longueur comprise entre quelques dizaines de centimètres et environ 1/3 de la longueur de la poutrelle et en ce que des armatures d'efforts tranchants (4) sont prévues dans lesdites parties d'extrémité (B), lesdites armatures d'efforts tranchants (4) s'étendant dans l'espace laissé libre au-dessus desdites parties d'extrémité (B) sans dépasser l'encombrement de la partie centrale.
- Poutrelle en béton précontraint selon la revendication 1, dans laquelle la longueur des parties d'extrémités (B) est au moins de 20 centimètres.
- Poutrelle selon la revendication 1 ou selon la revendication 2, dans laquelle la résistance aux moments de flexion est, en cas de besoin, largement améliorée en noyant dans la partie centrale (A) des aciers conformés de la même manière que ceux disposés dans les parties d'extrémités (B).
- Procédé de fabrication d'une poutrelle selon l'une quelconque des revendications 1 à 3, caractérisé en ce que :on choisit un moule en une seule pièce non ouvrant usuellement utilisé pour la fabrication de poutrelles en béton précontraint,on dispose un bourrage dans les parties d'extrémités du moule,on enfonce les aciers en saillie (4) dans ledit bourrage afin d'assurer leur positionnement,on procède au moulage de la poutrelle.
- Procédé selon la revendication 4, caractérisé en ce que le bourrage est en matériau pulvérulent.
- Procédé selon la revendication 4, caractérisé en ce que le bourrage est constitué par un bloc de polystyrène fendu en son milieu.
- Procédé selon la revendication 4, caractérisé en ce que le bourrage est constitué par un bloc de matériau souple.
- Procédé selon la revendication 4, caractérisé en ce que le bourrage est en carton.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9506183 | 1995-05-24 | ||
FR9506183A FR2734588B1 (fr) | 1995-05-24 | 1995-05-24 | Poutrelle en beton precontraint et son procede de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0744511A1 EP0744511A1 (fr) | 1996-11-27 |
EP0744511B1 true EP0744511B1 (fr) | 2003-02-12 |
Family
ID=9479333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96401126A Expired - Lifetime EP0744511B1 (fr) | 1995-05-24 | 1996-05-24 | Poutrelle en béton précontraint et son procédé de fabrication |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0744511B1 (fr) |
AT (1) | ATE232570T1 (fr) |
DE (1) | DE69626150D1 (fr) |
FR (1) | FR2734588B1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102808372B (zh) * | 2012-08-20 | 2016-10-05 | 杨众 | 一种简支的预制整浇叠合桥梁及施工方法 |
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 (fr) * | 2016-12-19 | 2018-06-28 | Kopalnia Kruszyw Zbrody 1 Sp. Z O.O. Sp .K. | Solive de toit préfabriquée |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191221269A (en) * | 1911-09-19 | 1913-04-24 | Fritz Edlen Von Emperger | Improvements in Reinforced Concrete Compression Elements for Building Constructions of all kinds. |
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 (fr) * | 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 |
-
1995
- 1995-05-24 FR FR9506183A patent/FR2734588B1/fr not_active Expired - Fee Related
-
1996
- 1996-05-24 AT AT96401126T patent/ATE232570T1/de not_active IP Right Cessation
- 1996-05-24 EP EP96401126A patent/EP0744511B1/fr not_active Expired - Lifetime
- 1996-05-24 DE DE69626150T patent/DE69626150D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69626150D1 (de) | 2003-03-20 |
ATE232570T1 (de) | 2003-02-15 |
EP0744511A1 (fr) | 1996-11-27 |
FR2734588A1 (fr) | 1996-11-29 |
FR2734588B1 (fr) | 1997-07-11 |
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