EP0170563B1 - Schutzverfahren für umhüllte Stahlspannglieder - Google Patents

Schutzverfahren für umhüllte Stahlspannglieder Download PDF

Info

Publication number
EP0170563B1
EP0170563B1 EP19850401282 EP85401282A EP0170563B1 EP 0170563 B1 EP0170563 B1 EP 0170563B1 EP 19850401282 EP19850401282 EP 19850401282 EP 85401282 A EP85401282 A EP 85401282A EP 0170563 B1 EP0170563 B1 EP 0170563B1
Authority
EP
European Patent Office
Prior art keywords
sheath
injection
protective material
sheathed
wax
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
Application number
EP19850401282
Other languages
English (en)
French (fr)
Other versions
EP0170563A1 (de
Inventor
Alain Chabert
Jean-Pierre Gérard
Michel Ivanoff
Jacques Lussault
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.)
Francaise Pour La Precontrainte (sfp) SA Ste
Elf Antar France
Original Assignee
Francaise Pour La Precontrainte (sfp) SA Ste
Elf 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 Francaise Pour La Precontrainte (sfp) SA Ste, Elf France SA filed Critical Francaise Pour La Precontrainte (sfp) SA Ste
Priority to AT85401282T priority Critical patent/ATE40843T1/de
Publication of EP0170563A1 publication Critical patent/EP0170563A1/de
Application granted granted Critical
Publication of EP0170563B1 publication Critical patent/EP0170563B1/de
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • 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

Definitions

  • the invention relates to a method for protecting live metallic cables housed in sheaths. It relates in particular to the protection of prestressing cables for structures in engineering structures, whether these cables are external or internal to said structures, but also the anchor rods or the shrouds.
  • prestressing The principle of prestressing is well known to those skilled in the art and it will simply be recalled that it consists in accommodating one or more cables in a sheath and in putting these cables under tension. Due to the tensioning of these cables, it is necessary to take certain precautions aimed at avoiding as much as possible any corrosion phenomenon. For this, it is customary to inject inside the sheath a cement grout which, however, presents the invention of constituting a rigid coating capable of cracking.
  • this fat injection method has several drawbacks.
  • the implementation of the injection is delicate because, due to the viscosity of the product, it is necessary to inject under pressure. In some cases, for long lengths of sheath for example, it is necessary to provide several injection points.
  • the protection of the cables with this grease is incomplete because it is difficult to completely fill the voids between the strands of each cable. There are risks of having areas not protected by grease, especially since it can contain air bubbles generated by the injection pump.
  • this method also has drawbacks linked to the physicochemical properties of fats, in particular problems of bleeding and physical instability (reversibility).
  • the invention relates to a protection method devoid of these drawbacks.
  • it provides a method of protecting metallic cables under tension housed inside a sheath which consists in injecting inside the sheath a flexible and stable protective material.
  • the process is characterized by the measures indicated in claim 1.
  • said material also comprises additives such as anti-rust and extreme pressure additives.
  • the wax is a microcrystalline wax comprising cyclic hydrocarbons.
  • the microcrystalline petroleum wax used has the following characteristics:
  • the wax After adding the various additives, the wax can have the following properties:
  • an additive wax marketed by the company Elf France under the name INJECTELF CP, consisting of 96% microcrystalline wax and mineral oil, the rest representing the proportions of additive.
  • the assembly to be protected therefore consists of a prestressing reinforcement made up of 10 rectilinear cables approximately 300 meters long, each of them consisting of 17 galvanized strands of 150 mm 2 in cross section. Each reinforcement is tensioned, in pairs, to a value close to 70% of the guaranteed rupture, which made it possible to apply a uniform stress of 4.2 MPa to the structure.
  • the anchors include double-groove keys allowing tension-relaxation cycles.
  • the conduits receiving the prestressing reinforcements consist of sheaths made of resin reinforced with glass fiber, having an outside diameter of 113.8 mm and a thickness of 2.28 mm.
  • Each sheath is made up of a set of elementary gains approximately 12 m long linked together by watertight connections. They are installed on supports spaced approximately 4 m apart.
  • each sheath has a permanent metal cover constituting a containment. of the injection.
  • the cover is connected to the sheath by an O-ring.
  • the injection was carried out using a product brought to the site via an insulated tanker truck.
  • the method according to the invention is perfectly ecological.
  • the assembly thus formed is perfectly stable, it can be used in structures subject to large temperature variations, especially since the material used is reversible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Ropes Or Cables (AREA)

Claims (4)

1. Verfahren zum Schutz von unter Spannung vorgespannten Metallkabeln, die im Inneren einer Hülle durch Injizieren in das Innere der Hülle eines Schutzmaterials eingebracht sind, dadurch gekennzeichnet, daß das Schutzmaterial, das wenigstens ein mikrokristallines Erdölwachs (cire petrolière) bei einer Temperatur injiziert wird, die oberhalb seiner Schmelztemperatur liegt und unter einem Druck zwischen 1 und 3 bar, vorzugsweise zwischen 1,8 und 2,2 bar.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Material aus 96 Gew.-% einer Mischung des mikrokristallinen Wachses und Mineralöl gebildet ist.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schutzmaterial weiterhin wenigstens ein Rostschutzadditiv enthält.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schutzmaterial wenigstens ein Höchstdruckadditif enthält.
EP19850401282 1984-06-25 1985-06-25 Schutzverfahren für umhüllte Stahlspannglieder Expired EP0170563B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401282T ATE40843T1 (de) 1984-06-25 1985-06-25 Schutzverfahren fuer umhuellte stahlspannglieder.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8409969 1984-06-25
FR8409969 1984-06-25
FR8503677 1985-03-13
FR8503677 1985-03-13

Publications (2)

Publication Number Publication Date
EP0170563A1 EP0170563A1 (de) 1986-02-05
EP0170563B1 true EP0170563B1 (de) 1989-02-15

Family

ID=26224033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850401282 Expired EP0170563B1 (de) 1984-06-25 1985-06-25 Schutzverfahren für umhüllte Stahlspannglieder

Country Status (2)

Country Link
EP (1) EP0170563B1 (de)
DE (1) DE3568292D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642103B1 (fr) * 1989-01-24 1995-03-24 Freyssinet Int Stup Perfectionnements aux procedes et dispositifs pour la mise en precontrainte du beton par post-tension

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB555826A (en) * 1941-07-16 1943-09-09 Remington Arms Co Inc Improvements in or relating to lubricants for ammunition
NL101982C (de) * 1961-02-27
GB1074311A (en) * 1962-08-27 1967-07-05 Taylor Woodrow Construction A stressed concrete structure
FR2410078A1 (fr) * 1977-11-28 1979-06-22 Cinematique Lab Cable d'amarrage et dispositif d'ancrage utilisant un tel cable
DE3038898C2 (de) * 1980-10-15 1985-10-10 Dyckerhoff & Widmann AG, 8000 München Verfahren zum Erzeugen eines Korrosionsschutzes bei Litzen aus hochfesten Stahldrähten
GB2095696B (en) * 1981-03-31 1985-03-06 Shell Int Research Locked coil rope lubricants

Also Published As

Publication number Publication date
DE3568292D1 (en) 1989-03-23
EP0170563A1 (de) 1986-02-05

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