EP0733757A1 - Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente - Google Patents

Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente Download PDF

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Publication number
EP0733757A1
EP0733757A1 EP95870020A EP95870020A EP0733757A1 EP 0733757 A1 EP0733757 A1 EP 0733757A1 EP 95870020 A EP95870020 A EP 95870020A EP 95870020 A EP95870020 A EP 95870020A EP 0733757 A1 EP0733757 A1 EP 0733757A1
Authority
EP
European Patent Office
Prior art keywords
sheath
solution
reinforcement
protected
injection
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
EP95870020A
Other languages
English (en)
French (fr)
Other versions
EP0733757B1 (de
Inventor
Pierre-Marie Dubois
Daniel Michaux
Jean-Claude Bourcy
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.)
ATEAV, SOCIETE A RESPONSABILITE LIMITEE
NORTEX
P.M.D. S.P.R.L.
Original Assignee
NORTEX
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
Priority to DK95870020T priority Critical patent/DK0733757T3/da
Application filed by NORTEX filed Critical NORTEX
Priority to EP95870020A priority patent/EP0733757B1/de
Priority to PT95870020T priority patent/PT733757E/pt
Priority to AT95870020T priority patent/ATE202613T1/de
Priority to ES95870020T priority patent/ES2158065T3/es
Priority to DE69521492T priority patent/DE69521492T2/de
Priority to US08/709,678 priority patent/US5840247A/en
Publication of EP0733757A1 publication Critical patent/EP0733757A1/de
Application granted granted Critical
Publication of EP0733757B1 publication Critical patent/EP0733757B1/de
Priority to GR20010401316T priority patent/GR3036465T3/el
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection

Definitions

  • the invention relates to a method of protection against the effects of oxidation on active reinforcements embedded in a mass of concrete, said reinforcements being able to be in the form of a set of wires or strands arranged in a sheath, and also to put at the same time highlight the imperfections of the injection grout (voids, porosities).
  • prestressed and / or post-stressed concrete is meant a technology enabling beams, slabs or any concrete element to be given sufficient own strength to enable them to fulfill the function assigned to them.
  • Active reinforcements are high-strength steels which are particularly sensitive to degradation by the effect of corrosion due to the action of oxygen. Protection against corrosion of these reinforcements is conventionally achieved by coating them with a mortar, or with a cement grout. In the latter case, the active reinforcements are enveloped by a continuous sheath, most often made of steel strips but also of PVC or, more recently, of high density polyethylene. This sheath constitutes the conduit which allows the injection of the protective cement grout. The protection of active prestressing reinforcement by adhesion is that conferred by structural concrete.
  • this protection against corrosion should be sufficient since it acts as a barrier to the penetration of oxygen from the air, it provides water tightness and, moreover, it gives the medium a pH basic preventing the development of corrosion.
  • the pathology described concerns road bridges as well as any type of pre-stressed or post-stressed construction.
  • the object of the invention is therefore to propose a new and original process capable of remedying the effects of oxidation on active reinforcements, this term being taken in its broadest sense.
  • the invention therefore consists in penetrating in all cases, even with perfectly injected sets of cement, the corrosion inhibiting solution on all of the metallic elements present.
  • a channel is first drilled in the mass of concrete opening out facing the reinforcement which must be protected and in that a corrosion inhibiting solution is then injected into said channel. to which is applied a pulsating wave of high power intended to make it penetrate.
  • the aforementioned channel is drilled, through said sheath so that the corrosion inhibiting solution can come into contact with the reinforcement , or the set of wires or strands to be protected and that afterwards a cement grout is injected in order to fill the pores and voids of the sheath injection grout.
  • At least one second channel is drilled opening out facing the armature to be protected in order to control the path of the inhibiting solution along said armature respectively inside the aforementioned sheath.
  • a remarkable characteristic of the invention resides in the fact that the inhibiting solution is introduced under pressure by making use of a high frequency reciprocating pump capable of producing a pulsed effect on the inhibiting solution.
  • Figure 1 is a schematic view of an installation illustrating the method according to the invention.
  • Figures 2 and 3 show on a larger scale a detail of the installation according to Figure 1, adapted to the protection of a sheathed frame.
  • the reference 1 designates a prestressed concrete beam.
  • the reinforcements 2 to be protected against the effects of oxidation can be placed in a sheath which has not been explicitly reproduced in FIG. 1.
  • this sheath is visible and is designated by the reference 3, and a cement grout coats the reinforcements 2.
  • a channel 4 is drilled in the mass of concrete up to the immediate vicinity of the reinforcements 2 and when a sheath is present. This drilling is also done through this sheath.
  • a high frequency alternating pulsating pump suitable for the application of the method according to the invention is shown schematically in the various figures by the reference 5.
  • Such a pump is developed so that a sealed enclosure is formed allowing to put in alternative compression the corrosion inhibiting solution.
  • the device known under the name of "sonotrode” makes it possible to put the inhibiting solution in overpressure and in depression and this at a sufficiently high frequency so that a pulsating effect of the liquid is obtained.
  • This pulsating effect of the liquid promotes its penetration into the interstices and microcracks present in the concrete near the reinforcements to be protected.
  • the ultrasonic transmitter has an injection tube 6 equipped externally with means which make it possible to achieve absolute sealing with respect to the channel 4 through which the liquid is injected.
  • the compression chamber is given the reference 7.
  • the inhibiting solution enters the ultrasonic emitter through line 8, while the coolant of the compression enclosure reaches the emitter through line 9.
  • the cooling solution of the compression chamber leaves the ultrasonic emitter through line 10 and the corrosion inhibiting liquid through line 11 to the overflow tank 12.
  • the circulation of a coolant is necessary in order to avoid overheating and possible degradation of the corrosion inhibiting liquid.
  • Ultrasound created by the high power ultrasonic transmitter which is used in the context of the method according to the invention has an additional effect.
  • the ultrasonic waves generated by the ultrasonic transmitter are powerful enough to create a cavitation effect in the liquid. This cavitation effect makes it possible to clear the entrances leading to the interstices and microcracks present in the concrete.
  • the ultrasonic acoustic waves cause vibration inside these interstices and these microcracks and by the same allow the opening and closing of these at the frequency of the acoustic wave. This phenomenon promotes the advancement of the liquid in these interstices and microcracks.
  • the channels 4 ′ make it possible to control the path of the inhibiting solution along the reinforcements 2, respectively inside the sheath 3.
  • the method therefore makes it possible to evaluate the porosity of the mass 13 of the existing injection mortar. If it can be concluded that the said grout is either non-existent or very porous, it is possible, after injection of the inhibiting solution, to inject via the conduits (4), and this by conventional means or by the process which has just be described, a cement-based micro-mortar.

Landscapes

  • Architecture (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Bridges Or Land Bridges (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Fuel-Injection Apparatus (AREA)
EP95870020A 1995-03-06 1995-03-06 Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente Expired - Lifetime EP0733757B1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP95870020A EP0733757B1 (de) 1995-03-06 1995-03-06 Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente
PT95870020T PT733757E (pt) 1995-03-06 1995-03-06 Processo de proteccao contra os efeitos da oxidacao das armaduras embebidas numa massa de betao
AT95870020T ATE202613T1 (de) 1995-03-06 1995-03-06 Verfahren zum schützen gegen oxydations-effekte von in beton eingebettete bewährungselemente
ES95870020T ES2158065T3 (es) 1995-03-06 1995-03-06 Procedimiento de proteccion contra los efectos de la oxidacion sobre unas armaduras activas embebidas en una masa de hormigon.
DK95870020T DK0733757T3 (da) 1995-03-06 1995-03-06 Fremgangsmåde til beskyttelse imod oxideringseffekter på aktiv armering indlejret i beton
DE69521492T DE69521492T2 (de) 1995-03-06 1995-03-06 Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente
US08/709,678 US5840247A (en) 1995-03-06 1996-09-09 Process for the protection of active reinforcements embedded in a concrete mass
GR20010401316T GR3036465T3 (en) 1995-03-06 2001-08-30 Method for protecting concrete-embedded reinforcing elements against oxidation effects

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP95870020A EP0733757B1 (de) 1995-03-06 1995-03-06 Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente
US08/709,678 US5840247A (en) 1995-03-06 1996-09-09 Process for the protection of active reinforcements embedded in a concrete mass

Publications (2)

Publication Number Publication Date
EP0733757A1 true EP0733757A1 (de) 1996-09-25
EP0733757B1 EP0733757B1 (de) 2001-06-27

Family

ID=26140792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95870020A Expired - Lifetime EP0733757B1 (de) 1995-03-06 1995-03-06 Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente

Country Status (8)

Country Link
US (1) US5840247A (de)
EP (1) EP0733757B1 (de)
AT (1) ATE202613T1 (de)
DE (1) DE69521492T2 (de)
DK (1) DK0733757T3 (de)
ES (1) ES2158065T3 (de)
GR (1) GR3036465T3 (de)
PT (1) PT733757E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011091862A1 (fr) 2010-02-01 2011-08-04 Pmd-Ateav Systems Sprl Procede et systeme d'injection de liquide dans un materiau poreux
EP2885452A4 (de) * 2012-08-14 2016-05-11 David W Whitmore Korrosionsschutz von kabeln in einer betonstruktur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6170209B1 (en) * 1996-11-05 2001-01-09 University Of Maine Prestressing system for wood structures and elements
FR2818274B1 (fr) * 2000-12-18 2003-02-14 Alto Btp Procede de protection, de reparation et de consolidation d'ouvrages d'arts comportant des elements metalliques inclus dans une matrice en beton, platre, ciment ou mortier
US6960320B1 (en) * 2004-04-15 2005-11-01 Lamplight Farms, Inc. Oil burning lamps and related systems
US7892601B1 (en) 2006-11-14 2011-02-22 Cortec Corporation Corrosion inhibiting powders and processes employing powders
US8800224B1 (en) 2006-11-14 2014-08-12 Cortec Corporation Corrosion inhibiting vapor for use in connection with encased articles
US8603603B2 (en) 2011-02-07 2013-12-10 Cortec Corporation Corrosion inhibiting systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346879A (en) * 1941-09-30 1944-04-18 Louis S Wertz Apparatus for filling cracks in concrete masonry structures
FR2116618A5 (en) * 1970-12-01 1972-07-21 Conin Gilbert Repairing cracked concrete beams - by injecting epoxy resin
GB1480718A (en) * 1975-12-02 1977-07-20 Balfour Beatty Ltd Artificial and natural structures
EP0300956A1 (de) * 1987-07-24 1989-01-25 HILTI Aktiengesellschaft Verfahren zur Verfestigung gerissener Bauteile
WO1992020902A1 (en) * 1991-05-22 1992-11-26 Ingvar Bogdanoff A rock or concrete injection method and a device for performing the method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346879A (en) * 1941-09-30 1944-04-18 Louis S Wertz Apparatus for filling cracks in concrete masonry structures
FR2116618A5 (en) * 1970-12-01 1972-07-21 Conin Gilbert Repairing cracked concrete beams - by injecting epoxy resin
GB1480718A (en) * 1975-12-02 1977-07-20 Balfour Beatty Ltd Artificial and natural structures
EP0300956A1 (de) * 1987-07-24 1989-01-25 HILTI Aktiengesellschaft Verfahren zur Verfestigung gerissener Bauteile
WO1992020902A1 (en) * 1991-05-22 1992-11-26 Ingvar Bogdanoff A rock or concrete injection method and a device for performing the method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011091862A1 (fr) 2010-02-01 2011-08-04 Pmd-Ateav Systems Sprl Procede et systeme d'injection de liquide dans un materiau poreux
RU2524582C2 (ru) * 2010-02-01 2014-07-27 ПМД-АТЕАВ Системс СПРЛ Способ и система для нагнетания жидкости в пористый материал
US8911835B2 (en) 2010-02-01 2014-12-16 Pmd-Ateav Systems Sprl Method and system for injecting liquid in a porous material
EP2885452A4 (de) * 2012-08-14 2016-05-11 David W Whitmore Korrosionsschutz von kabeln in einer betonstruktur

Also Published As

Publication number Publication date
ATE202613T1 (de) 2001-07-15
EP0733757B1 (de) 2001-06-27
PT733757E (pt) 2001-12-28
US5840247A (en) 1998-11-24
GR3036465T3 (en) 2001-11-30
DK0733757T3 (da) 2001-10-29
ES2158065T3 (es) 2001-09-01
DE69521492D1 (de) 2001-08-02
DE69521492T2 (de) 2002-06-06

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