WO1988009847A1 - Corrosion prevention for braces - Google Patents

Corrosion prevention for braces Download PDF

Info

Publication number
WO1988009847A1
WO1988009847A1 PCT/DE1988/000346 DE8800346W WO8809847A1 WO 1988009847 A1 WO1988009847 A1 WO 1988009847A1 DE 8800346 W DE8800346 W DE 8800346W WO 8809847 A1 WO8809847 A1 WO 8809847A1
Authority
WO
WIPO (PCT)
Prior art keywords
annular gap
cable
tension member
nitrogen
corrosion protection
Prior art date
Application number
PCT/DE1988/000346
Other languages
German (de)
English (en)
French (fr)
Inventor
Wolfgang Borelly
Original Assignee
Wolfgang Borelly
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 Wolfgang Borelly filed Critical Wolfgang Borelly
Priority to AT88904917T priority Critical patent/ATE66708T1/de
Priority to DE8888904917T priority patent/DE3864517D1/de
Publication of WO1988009847A1 publication Critical patent/WO1988009847A1/de

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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables

Definitions

  • the tension member with A sheathing made of sheet steel is characterized in that the sheathing is held at a distance from the tension member with the aid of spacers in such a way that there is an annular gap surrounding the tension member, said sheathing being tightly folded, soldered or soldered over the entire length of the tension member is welded and a compensating stretching device is arranged at the upper end of the casing,
  • annular gap is filled with a corrosion protection liquid, which has a lower specific weight than water and also a particularly low viscosity, and are dissolved in the additives that protect against corrosion;
  • the anticorrosive fluid receives moisture-infiltrating and corrosion-preventing admixtures in the form of gas phase inhibitors, so that the residual amounts of oxygen are neutralized by reactants and the moisture on the steel surfaces is infiltrated, dissolved and brought to a decrease in the annular gap;
  • the cables With the help of an electrical current of about 14-30 volts and about 4000 to 6000 amps introduced into the wires of the cables usually via the anchor body encapsulation (usually zinc alloy) into the wires of the cables, the cables are heated by measuring devices by about 40 ° to Max. 60 ° C. With regard to the heating-up time, a test is necessary, as this depends on the heat loss on the cladding sheet.
  • a low pressure of up to 60 mbar u. is suppressed in the annular gap space by means of a "pump" specially designed for vacuum technology (a two-stage rotary vane vacuum pump in a performance range between about 65-200 m 3 / h suction capacity is preferred).
  • Theoretically, the moisture in the cavities between wires, strands and ropes can be pressed down to a proportion of about 1/24000 by such an evaporation and pumping out process.
  • the pump conveys the steam to the outside, whereby the amount of liquid conveyed can be measured and recorded in absolute terms and in relation to the time unit by means of partial pressure measurement on the downstream mass spectrometer.
  • This first drying stage naturally depends on the amount of moisture actually inside the cable and the temperatures present during evacuation. If a steady state can be recognized by means of the measuring device, this process is to be regarded as finished. Specialist companies and certain departments of local governments have particular experience in this area from the frequent evacuation of district heating pipes.
  • this process reveals the amount of moisture inside the cable except for the residues mentioned.
  • the leak rate of the system i.e. the amount of leak per unit of time
  • the leak rate of the system can be determined relatively easily before the drying process. This affects the tightness of the welded sheaths as well as the function of the stuffing boxes. This provides a good opportunity to determine the practically given but not known values.
  • a certain, even if only slight, excess pressure of the pressed-in dry gaseous medium - preferably completely dry air or N 2 gas - of around 50 mbar in the annular gap ensures the tightness through the gland construction - an ingress of water, oxygen or other Prevents pollutants.
  • the low loss due to leakage rates must be compensated for by cold nitrogen gasifiers, which have to be replenished by the specialist companies in industrialized countries in a period of several months (e.g. from Messer, Griesheim).
  • the nitrogen supply is automatically checked via a pressure cell. This process can U. be connected to an alarm signal line.
  • the medium-sized cold carburettor can almost accommodate the annual demand that arises with normal European bridges on the Rhine and Danube, with refill 1 or 2 times a year.
  • the costs for the annual requirement - cold gasifier rental and the required nitrogen material - would be less than the annual interest amount of the funds that would be needed to top up with the anti-corruption oil intended for use.
  • the use of nitrogen is therefore cheaper, and there are also the technical advantages:
  • dry air or N 2 gas it is possible at any time to use the mass spectrometer to examine the gas escaping from the glands for moisture and thus very easily provide reliable control to perform the processes in the annular gap and in the cable.
  • the welding of any leaks in the sheet metal shell is completely unproblematic with a nitrogen filling in the ring gap.
  • the constantly renewed N 2 gases flush the remaining residues of moisture from the inside of the cable into the ring area and carry them out from there as they physically strive to equalize the partial pressure between the two media.
  • VPI 260 - 350 As an inexpensive fine chemical, this substance is manufactured by the international large-scale oil refineries, including Shell, under the name VPI 260 - 350 with certain variations in properties depending on the application.
  • the chemical is split under the influence of water vapor. Free forms Amine and nitrous acid. The latter oxidizes the iron to iron oxides on the metal surface. The surface is also covered with a thin layer of amine. The nitrogen oxide produced during the oxidation of iron in turn forms nitrous acid with the moisture and oxygen present, which is able to passivate further surface parts.
  • the protective layers are of molecular strength and therefore of limited duration.
  • the material VPI 300 dissolves with 55.6 parts by weight in 100 parts by weight of water, the liquid that is still present being rendered ineffective in corrosion.
  • the appropriately mixed V PI chemical is able to penetrate and infiltrate the moist rust material at corrosion points and thereby make the moisture present in the electrolyte ineffective against corrosion. Until these liquid parts are bound and transported away by the constant drying process in the partial pressure equalization with the flushing nitrogen, the VPI material had an accelerating effect on the corrosion process in the interior of the cable. If this residual moisture has been removed, which can be reliably determined by investigations using a mass spectrometer, it is no longer necessary to add this chemical.
  • a window opening is cut into the remaining casing and then attached to the separated plastic fiber network with which the cable had been wrapped or pulled off in a similar manner using a pulling device.
  • galvanic connection can be maintained at C if this is interrupted at A and B.
  • the supply of the heating current of about I 4000 - 6000 Amp. Strength, with which the wire cable or rope package is to be brought to 60 oC, must be laid out in such a way that the individual wires are applied as evenly as possible. Any arcing is to be prevented, for example: diametrically screwed or soldered onto the long sides of the cast steel anchor sleeve compared to two approx. 140 mm long copper bars, to which 5 single-core cables ⁇ 110 mm 2 , i.e. 10 in total, are clamped or screwed.
  • the current flow via the usual zinc alloy casting compound in the anchor cone can be evenly into the wires of the parallel wire bundle or the spread ropes of a cable package. In places where a spherical plastic encapsulation has been carried out, the current must be supplied from the rear of the anchor body via the cleaned, previously exposed wire heads and the perforated plate.
  • Each anchor sleeve is slightly lifted from the anchor bar by pressing and, as in Fig. 6 no. 19 and 20 inserted the insulating pipe halves and pressure distribution plates.
  • this clamp is lifted slightly from the steel structure of the bridge, either vertically or laterally, and the intermediate layer that provides galvanic insulation is inserted. Where there is no contact from the expansion clamp to the bridge structure, which is often the case, no such measure is necessary.
  • VPI powder is passed through the VPI powder until it is completely saturated (40 g VPI per 1 kg N 2 gas)
  • Rotary vane vacuum pump (capacity depends on: amount of water in the cable, cable length, annular gap and cable cross-sections as well as temperature conditions 47 control cabinet with measuring devices and recorders 48 possibly remote control or query option from the bridge deck 49 electrical connections 50 automatic notification of irregularities to the work place on the bridge deck

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Soft Magnetic Materials (AREA)
  • Ropes Or Cables (AREA)
PCT/DE1988/000346 1987-06-11 1988-06-10 Corrosion prevention for braces WO1988009847A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT88904917T ATE66708T1 (de) 1987-06-11 1988-06-10 Korrosionsschutz fuer zugglieder.
DE8888904917T DE3864517D1 (de) 1987-06-11 1988-06-10 Korrosionsschutz fuer zugglieder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873723795 DE3723795A1 (de) 1987-06-11 1987-06-11 Korrosionsschutz fuer ein aus staehlernen seilen oder paralleldraht- oder -litzenbuendeln bestehendes zugglied
DEP3723795.0 1987-06-11

Publications (1)

Publication Number Publication Date
WO1988009847A1 true WO1988009847A1 (en) 1988-12-15

Family

ID=6331851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000346 WO1988009847A1 (en) 1987-06-11 1988-06-10 Corrosion prevention for braces

Country Status (4)

Country Link
EP (1) EP0354924B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE66708T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3723795A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO1988009847A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393013A1 (de) * 1989-04-12 1990-10-17 Vorspann-Technik Gesellschaft m.b.H. Spannbündel aus mehreren Spanngliedern wie Litzen, Stäben oder Drähten
WO1998040561A1 (de) * 1997-03-12 1998-09-17 Eps Schaub Gmbh Korrosionsschutz-einrichtung für ein seil
AT404956B (de) * 1989-06-06 1999-04-26 Vorspann Technik Gmbh Spannbündel
EP0967300A1 (de) * 1998-06-23 1999-12-29 Reicon Wärmetechnik Und Wasserchemie Leipzig GmbH Verfahren zum Schutz metallischer Bauteile vor Korrosion in Trocknungsanlagen der Bauindustrie
AT407766B (de) * 1989-02-27 2001-06-25 Vorspann Technik Gmbh Spannbündel
US7814600B2 (en) * 2004-11-12 2010-10-19 Vsl International Ag Corrosion protection system for a construction including a stay cable
GB2466421B (en) * 2007-10-30 2013-01-02 Ihi Infrastructure Sys Co Ltd Device and method for preventing rusting of cable for supporting bridge
WO2018130271A1 (en) * 2017-01-10 2018-07-19 Vsl International Ag Hybrid pipe for stay cable and its manufacturing method
CN113308994A (zh) * 2021-06-25 2021-08-27 柳州市桥厦缆索制品有限公司 一种索体及气相缓蚀平行钢丝拉索
US11365513B2 (en) 2016-07-27 2022-06-21 Soletanche Freyssinet Dual-sheath structural cable
US11519142B2 (en) 2017-02-03 2022-12-06 Soletanche Freyssinet Structural cable having an inner housing

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823964A1 (de) * 1988-07-15 1990-02-22 Bilfinger Berger Vorspanntech Verfahren zur erneuerung des korrosionsschutzes von zuggliedern von bruecken und gleichartig verspannten bauwerken sowie vorrichung zur durchfuehrung des verfahrens
ATE244794T1 (de) * 1998-10-15 2003-07-15 Yincheng Hou Schrägseilsystem
FR2846982B1 (fr) * 2002-11-07 2005-01-28 Freyssinet Int Stup Cable de structure protege contre la corrosion, gel anti-corrosion, et procede d'injection de produits anti-corrosion dans le cable
RU2352711C2 (ru) * 2004-11-12 2009-04-20 Фсл Интернациональ Аг Система коррозионной защиты для конструкции, содержащей ванту
CN1831246B (zh) * 2005-03-11 2010-04-28 柳州欧维姆机械股份有限公司 带索夹填块的索夹及用其夹持悬索桥主缆的方法
CN111851298A (zh) * 2020-07-07 2020-10-30 北京赛亿科技有限公司 一种利用通气钢管结构的悬索桥主缆除湿系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3341513A1 (de) * 1983-11-17 1985-06-20 Hans 5462 Bad Hönningen Ziegeler Verfahren fuer korrosionsschutz und konservierung von sauerstoff und mit sauerstoff oxidierenden gegenstaenden, aller art und groesse
DE3424737C1 (de) * 1984-07-05 1985-08-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren und Vorrichtung zum Verfüllen eines Ringspaltes von Daueranker-Spanndrahtlitzen mit einem Korrosionsschutzmittel
DE3416995A1 (de) * 1984-05-09 1985-11-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren zum einbringen eines injektionswerkstoffes in einen hohlraum bei einer stahlbetonkonstruktion
DE3417008A1 (de) * 1984-05-09 1985-11-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren zur vorbereitung von in ein stahlbetonbauteil eingebauten vorspannaggregaten fuer ein verpressen mit einer verpressmasse
DE3532204A1 (de) * 1985-09-02 1987-05-21 Wolfgang Dipl Ing Borelly Korrosionsschutz fuer zugglieder aus drahtseilen paralleldraht - und - litzenbuendeln
DE3629704C1 (en) * 1985-09-02 1988-01-14 Wolfgang Dipl-Ing Borelly Corrosion protection for a tension member formed from steel ropes, parallel wire bundles or parallel strand bundles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2549299A1 (de) * 1975-11-04 1977-05-12 Wolfgang Dipl Ing Borelly Verfahren zum herstellen eines wartungsfreien, bzw. weitgehend wartungsfreien, korrosionsschutzes fuer werkseitig fabrizierte paralleldrahtbuendel und das dafuer benoetigte montageverfahren bei grossbruekkenbauten und bei aehnlichen technischen aufgaben

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3341513A1 (de) * 1983-11-17 1985-06-20 Hans 5462 Bad Hönningen Ziegeler Verfahren fuer korrosionsschutz und konservierung von sauerstoff und mit sauerstoff oxidierenden gegenstaenden, aller art und groesse
DE3416995A1 (de) * 1984-05-09 1985-11-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren zum einbringen eines injektionswerkstoffes in einen hohlraum bei einer stahlbetonkonstruktion
DE3417008A1 (de) * 1984-05-09 1985-11-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren zur vorbereitung von in ein stahlbetonbauteil eingebauten vorspannaggregaten fuer ein verpressen mit einer verpressmasse
DE3424737C1 (de) * 1984-07-05 1985-08-14 Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen Verfahren und Vorrichtung zum Verfüllen eines Ringspaltes von Daueranker-Spanndrahtlitzen mit einem Korrosionsschutzmittel
DE3532204A1 (de) * 1985-09-02 1987-05-21 Wolfgang Dipl Ing Borelly Korrosionsschutz fuer zugglieder aus drahtseilen paralleldraht - und - litzenbuendeln
DE3629704C1 (en) * 1985-09-02 1988-01-14 Wolfgang Dipl-Ing Borelly Corrosion protection for a tension member formed from steel ropes, parallel wire bundles or parallel strand bundles

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407766B (de) * 1989-02-27 2001-06-25 Vorspann Technik Gmbh Spannbündel
EP0393013A1 (de) * 1989-04-12 1990-10-17 Vorspann-Technik Gesellschaft m.b.H. Spannbündel aus mehreren Spanngliedern wie Litzen, Stäben oder Drähten
US5573852A (en) * 1989-04-12 1996-11-12 Vorspann-Technik Gesellschaft M.B.H. Tensioning bundles comprising a plurality of tensioning members such as stranded wires, rods or single wires
AT404956B (de) * 1989-06-06 1999-04-26 Vorspann Technik Gmbh Spannbündel
WO1998040561A1 (de) * 1997-03-12 1998-09-17 Eps Schaub Gmbh Korrosionsschutz-einrichtung für ein seil
EP0967300A1 (de) * 1998-06-23 1999-12-29 Reicon Wärmetechnik Und Wasserchemie Leipzig GmbH Verfahren zum Schutz metallischer Bauteile vor Korrosion in Trocknungsanlagen der Bauindustrie
US7814600B2 (en) * 2004-11-12 2010-10-19 Vsl International Ag Corrosion protection system for a construction including a stay cable
GB2466421B (en) * 2007-10-30 2013-01-02 Ihi Infrastructure Sys Co Ltd Device and method for preventing rusting of cable for supporting bridge
US11365513B2 (en) 2016-07-27 2022-06-21 Soletanche Freyssinet Dual-sheath structural cable
WO2018130271A1 (en) * 2017-01-10 2018-07-19 Vsl International Ag Hybrid pipe for stay cable and its manufacturing method
US11339544B2 (en) 2017-01-10 2022-05-24 Vsl International Ag Hybrid pipe for stay cable and its manufacturing method
US11519142B2 (en) 2017-02-03 2022-12-06 Soletanche Freyssinet Structural cable having an inner housing
US11525225B2 (en) 2017-02-03 2022-12-13 Soletanche Freyssinet Structural cable having an inner housing
CN113308994A (zh) * 2021-06-25 2021-08-27 柳州市桥厦缆索制品有限公司 一种索体及气相缓蚀平行钢丝拉索

Also Published As

Publication number Publication date
DE3723795A1 (de) 1988-12-29
EP0354924B1 (de) 1991-08-28
EP0354924A1 (de) 1990-02-21
DE3723795C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1990-03-01
DE3864517D1 (de) 1991-10-02
ATE66708T1 (de) 1991-09-15

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