BE855374R - PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZED - Google Patents
PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZEDInfo
- Publication number
- BE855374R BE855374R BE178180A BE178180A BE855374R BE 855374 R BE855374 R BE 855374R BE 178180 A BE178180 A BE 178180A BE 178180 A BE178180 A BE 178180A BE 855374 R BE855374 R BE 855374R
- Authority
- BE
- Belgium
- Prior art keywords
- emi
- procédé
- bars
- steel
- procédé according
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- 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
- B28B23/046—Post treatment to obtain pre-stressed articles
-
- 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
- B28B23/06—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 for the production of elongated articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Rod-Shaped Construction Members (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
<EMI ID=1.1>
PROCEDE DE REALISATION D'UNE POUTRE EN BETON PRECONTRAINTAPPAREILLAGE A CET EFFET ET POUTRE AINSI REALISEE.
<EMI ID=2.1>
vet de perfectionnement sont respectivement prévues les bar- \ res crénelées en acier naturellement dur et les barres crénelées en acier demi-doux dont le laminage se fait à chaud suivi d'un écrouissage à froid par torsion'.
Dans les deux cas, la tension de ces barres
se fait en prenant appui sur des massifs extérieurs à la poutre à précontraindre. Après durcissement du béton coulé autour des barres, elles sont relâchées et libérées* L'adhérence acier-béton transmet l'effort de précontrainte au béton. On
<EMI ID=3.1>
extérieurs, l'injection d'une gaine contenant de l'acier tendu ne sont pas nécessaires.
Il est intéressant de créer la précontrainte dans les mêmes conditions de "pré-tension" au moyen de barres en acier fileté de gros diamètre. Ces barres sont utilisées
<EMI ID=4.1>
en tension en prenant appui sur le béton durci. Dans ce système. les ancrages extérieurs et l'injection des aciers tendus
se trouvant dans une gaine sont nécessaires.
Les tronçons de ces barres filetées sont assemblés.par des manchons vissés et, dans certains cas, bloquée
par des écrous. Cela permet de réaliser, sans difficulté, dans
une usine de préfabrication, de très grandes longueurs pour pouvoir confectionner sur un banc de travail, plusieurs poutres*.
Dans ces conditions, certains manchons.' .font partie du matériel
de cette usine.
'Pour faire diminuer la précontrainte près des
<EMI ID=5.1>
res reliées à un manchon prévu à l'endroit déterminé par calcul. Lteffort de précontrainte ayant été transmis sur le béton, ces tronçons peuvent être dévissés et retirés du béton. Le manchon et la barre tendue, sans gaine, de la partie centrale de
la poutre restent dans le béton" On réalise ainsi une poutre
dont la disposition des armatures précontraintes est conforme
<EMI ID=6.1>
peuvent être réutilisés comme étriers précontraints avec gaine et injection.
<EMI ID=7.1>
d'une ou de plusieurs plaques d'acier fixées sur la barre au moyen des écrous.
<EMI ID=8.1>
riquée à l'usine dépasse les possibilités de transport, on préfabrique séparément les deux abo�ts qui sont transportés et as-
<EMI ID=9.1>
des barres filetées.
<EMI ID=10.1>
Les calculs, les études et les essais dont il est question dans le brevet principal sont parfaitement valables pour ces barres.
Dans la fig.1 dubrevet principal les 4 et 5 sont.formés par des barres filetées de "pré-tension". Les 7
<EMI ID=11.1>
melle 1 sera, dans certains cas, considérablement élargie et sa largeur dépassera celle de la semelle 2.
REVENDICATIONS.
1.Usage des barres filetées. Qualité 85/105.
<EMI ID=12.1>
<EMI ID = 1.1>
PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM WITH APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZED.
<EMI ID = 2.1>
For further development, there are respectively the crenellated bars of naturally hard steel and the crenellated bars of semi-mild steel, the rolling of which is carried out hot followed by cold hardening by torsion.
In both cases, the tension of these bars
is done by resting on solid masses external to the beam to be prestressed. After hardening of the concrete poured around the bars, they are relaxed and released * The steel-concrete bond transmits the prestressing force to the concrete. We
<EMI ID = 3.1>
exterior, the injection of a sheath containing tensioned steel is not necessary.
It is interesting to create the prestress under the same conditions of "pre-tension" by means of threaded steel bars of large diameter. These bars are used
<EMI ID = 4.1>
in tension by resting on the hardened concrete. In this system. the external anchors and the injection of tensioned steels
in a duct are required.
The sections of these threaded bars are assembled by screwed sleeves and, in some cases, blocked
by nuts. This makes it possible to achieve, without difficulty, in
a prefabrication plant, of very long lengths to be able to manufacture on a work bench, several beams *.
Under these conditions, some sleeves. ' . are part of the material
of this factory.
'' To decrease the preload near the
<EMI ID = 5.1>
res connected to a sleeve provided at the location determined by calculation. Since the prestressing force has been transmitted to the concrete, these sections can be unscrewed and removed from the concrete. The sleeve and the taut bar, without sheath, of the central part of
the beam remain in the concrete "We thus realize a beam
the arrangement of the prestressed reinforcements in accordance with
<EMI ID = 6.1>
can be reused as prestressed calipers with sheath and injection.
<EMI ID = 7.1>
one or more steel plates fixed to the bar by means of nuts.
<EMI ID = 8.1>
rique at the factory exceeds the transport possibilities, we prefabricate separately the two units which are transported and supplied.
<EMI ID = 9.1>
threaded bars.
<EMI ID = 10.1>
The calculations, studies and tests referred to in the main patent are perfectly valid for these bars.
In fig.1 main patent the 4 and 5 are formed by threaded bars of "pre-tension". The 7
<EMI ID = 11.1>
melle 1 will, in some cases, be considerably widened and its width will exceed that of sole 2.
CLAIMS.
1.Use of threaded bars. Quality 85/105.
<EMI ID = 12.1>
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE178180A BE855374R (en) | 1976-08-09 | 1977-06-03 | PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZED |
| DE19772734757 DE2734757A1 (en) | 1976-08-09 | 1977-08-02 | Prestressed concrete beam mfr. - uses threaded steel bars inserted into sheaths joined to screwed sleeves to reduce prestress at supports |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE169672A BE845022A (en) | 1976-08-09 | 1976-08-09 | PROCESS FOR MAKING A PRECONTRATED CONCRETE BEAM, EQUIPMENT FOR THIS EFFECT AND BEAM THUS REALIZED |
| BE178180A BE855374R (en) | 1976-08-09 | 1977-06-03 | PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE855374R true BE855374R (en) | 1977-12-05 |
Family
ID=25649532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE178180A BE855374R (en) | 1976-08-09 | 1977-06-03 | PROCESS FOR MAKING A PRE-STRESSED CONCRETE BEAM APPARATUS FOR THIS EFFECT AND BEAM THUS REALIZED |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE855374R (en) |
-
1977
- 1977-06-03 BE BE178180A patent/BE855374R/en active
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