EP0350822A2 - Process for renovating the corrosion prevention of tension elements of bridges or similar stayed constructions, and apparatus for carrying out this process - Google Patents

Process for renovating the corrosion prevention of tension elements of bridges or similar stayed constructions, and apparatus for carrying out this process Download PDF

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Publication number
EP0350822A2
EP0350822A2 EP89112544A EP89112544A EP0350822A2 EP 0350822 A2 EP0350822 A2 EP 0350822A2 EP 89112544 A EP89112544 A EP 89112544A EP 89112544 A EP89112544 A EP 89112544A EP 0350822 A2 EP0350822 A2 EP 0350822A2
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EP
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Prior art keywords
annular space
tension member
coating agent
liquid coating
tension
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EP89112544A
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German (de)
French (fr)
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EP0350822A3 (en
Inventor
Heinrich Fischer
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BBV Systems GmbH
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Bilfinger und Berger Vorspanntechnik GmbH
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Publication of EP0350822A2 publication Critical patent/EP0350822A2/en
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    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method and a device for renewing the corrosion protection of tension members of bridges and similarly braced structures.
  • tension members Although such tension members are covered, corrosion formers diffuse through the cover to the tension member. Often, a source of damage cannot be identified in time or there is no possibility of checking the extent of the source of damage without destroying the casing.
  • the expert can give no guarantee that there are air pockets in the wire interstices of the tension members.
  • a method that proposes to surround the tension members with a cover made of sheet steel, the annular gap between cover and tension member being filled with a liquid in which additives protecting against corrosion are dissolved.
  • This liquid also contains moisture-penetrating, corrosion-preventing additives which dissolve the moisture and cause it to sink within the liquid.
  • Such a method is very complex and is burdened with high maintenance costs, since the corrosion protection liquid which is always present also the one set sealing elements impaired. Furthermore, a compensation vessel must be arranged at the end of the tension members, which keeps the filling levels of the annular gaps constant. Another disadvantage of such a method is that an alarm device is required to control the system, which further reports a leak in the casing.
  • DE-PS 33 43 352 describes a composite cable for prestressed concrete plants, in which the cladding tube is composed of individual steel tube sections which have external threads at their ends and are screwed together with threaded sockets, the trumpet-shaped extensions each having a one-piece steel body which has an extension tube has an external thread for screwing to the cladding tube and other end pieces.
  • DE-OS 34 37 107 describes a tension member tensioned between components and anchored relative to them, in particular stay cable for a cable-stayed bridge, from a number of individual elements arranged together in a tubular envelope, the cavities between the individual elements and the tubular envelope from after tensioning material introduced into the tension member, for example cement mortar, and the individual elements are provided with a coating of plastic over their entire length including their course within the anchoring devices.
  • DE-OS 34 37 350 describes a cable for buildings, in particular inclined cable bridges, consisting of several bundled tension elements which are surrounded by a cladding tube, the cavity between tension elements and cladding tube being pressed with an injection material, preferably cement mortar, and the cladding tube made of at least one strip of material is formed and each has a seam at adjacent strip longitudinal edges.
  • DE-PS 36 29 704 describes corrosion protection for a tension member formed from steel ropes, parallel wire bundles or parallel strand bundles, in which the sheathing is held at a distance from the tension member with the aid of spacers, so that an annular gap surrounding the tension member results and on A compensating expansion device is arranged at the upper end of the sheathing, furthermore the annular gap is filled with a corrosion protection liquid and this contains moisture-infiltrating and corrosion-preventing admixtures in the form of gas phase inhibitors, the annular gap is sealed against this at both ends of the tension member, and a compensation vessel is also located at the upper end of the tension member is located and a silica gel sluice that draws moisture out of the incoming air is arranged above the expansion tank.
  • the invention is based on the object of providing a method and a device of the type mentioned at the outset, the elimination of corrosion formers within the tension members and a reliable control being possible without high maintenance costs.
  • Two-component resins can also be suitable as coating agents, these being drained off again before hardening.
  • two-component resins are suitable, for example, which have a setting time of, for example, 10 hours.
  • Waxes in particular ester waxes, which contain both hydrophilic and hydrophobic components in the molecule are also suitable as liquid coating agents.
  • the gas filling can optionally also be replaced in whole or in part by a so-called fluid, that is to say, for example, by a preferably easily movable liquid.
  • Figure 1 shows a bridge structure 8, which is tensioned with tension members 3, preferably consisting of steel ropes.
  • the tension members 3 are covered with a protective tube 4.
  • the protective tubes 4 are preferably tightly closed in the area of the high point 7 of the bridge structure 8, while in the low point area 9 of the bridge structure 8 the protective tubes 4 open into a suction or pump device 10.
  • the suction and pumping device 10 can be designed in such a way that it serves to attach a pump. However, make sure that the connection element is tightly sealed after removing the pump.
  • Figure 2 shows a cross section through a tension member 3, which is covered with a protective tube 4.
  • the annular space 1 is created by spacers 6.
  • the annular space 1 is again filled under vacuum with a coating agent 2, preferably made of synthetic resin (see FIG. 4).
  • a particular advantage of this method is that the coating agent 2 penetrates into the spaces 13 of the tension member 3 while favoring the vacuum and thus coats the individual tension members 3a, 3b etc.
  • the coating agent 2 is emptied again from the protective tube 4, so that the tension member 3 with its individual tension members 3a, 3b etc. is coated with the coating agent 2, but the annular space 1 is retained (Fig. 5).
  • FIG. 5a shows an enlargement of the detail labeled "A" in FIG.
  • the annular space 1 thus obtained can be mixed with a control medium, i.e. a control fluid or a control liquid 5 are filled (FIG. 6), which is then analyzed for its constituents (any corrosion agents that may occur).
  • a control medium i.e. a control fluid or a control liquid 5 are filled (FIG. 6)

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Bridges Or Land Bridges (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a process for renovating the corrosion-protection coating of tension elements, which is characterised by the following process steps, a) the damaged corrosion-protecting coating, for example a plastic coating or coats of paint, are at least partially removed, b) the exposed steel wires are freed of possible rust, c) the tension element is provided with a gastight covering, an annular space which runs through in all directions being created by means of spacers, d) the moisture present in the tension element is evaporated by generating a reduced pressure and/or by heating the tension element, and the water vapour is continuously filtered off with suction by means of the vacuum pump generating the reduced pressure until a reduced pressure minimum is constantly set, e) the annular space is filled with a liquid coating medium, f) after filling of the annular space, the still liquid coating agent is let out at the low point of the covering via a valve, while a dry gas is drawn in through a further valve at the high point of the covering, the tension element remaining coated with a thin layer of the coating agent, g) the inlet and the outlet valve are closed. According to a preferred embodiment, the gas filling or fluid filling of the annular space is constantly provided with an elevated pressure in order to compensate for leakage losses, the elevated pressure being monitored by an automatic alarm and reporting system. The invention also relates to an apparatus for carrying out the process, in which the covering, as protective pipe, is sealed off at the ends and connections for the suction and pumping apparatus are arranged. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrich­tung zur Erneuerung des Korrosionsschutzes von Zug­gliedern von Brücken und gleichartig verspannten Bau­werken.The invention relates to a method and a device for renewing the corrosion protection of tension members of bridges and similarly braced structures.

Brücken und Bauwerke, die mit Zuggliedern aus stählernen Seilen verspannt sind, unterliegen dem Sicherheits­risiko, daß die Zugglieder durch Korrosion belastet sind.Bridges and structures that are tensioned with tension members made of steel ropes are subject to the safety risk that the tension members are stressed by corrosion.

Obwohl solche Zugglieder ummantelt sind, diffundieren Korrosionsbildner durch die Ummantelung an das Zug­glied heran.
Oftmals kann ein Schadensherd nicht rechtzeitig er­kannt werden bzw. es besteht keine Kontrollmöglich­keit den Umfang des Schadensherdes ohne Zerstörung der Ummantelung festzustellen.Although such tension members are covered, corrosion formers diffuse through the cover to the tension member.
Often, a source of damage cannot be identified in time or there is no possibility of checking the extent of the source of damage without destroying the casing.

Es wurden daher schon mehrere Verfahren vorgeschlagen, die die nachträgliche Korrosionsschutzaufbringung auf bereits verspannte Kabel vorsieht. Unter anderem ist ein Verfahren bekannt, bei dem die Zugglieder mit Schalung versehen werden, so daß das Zugglied innerhalb einer Röhre, die durch die Schalung ge­bildet wird, zum Liegen kommt, wobei der Ringspalt zwischen Zugglied und Schalung mit einem Elastomer, Fett oder Zementleim befüllt wird. Einerseits können diese Schalungen nach dem Aushärten des Elastomers entfernt werden oder aber sie verschweißen sich mit dem Elastomer und verbleiben als weiterer Mantel um das Zugglied.A number of methods have therefore already been proposed which provide for the subsequent application of corrosion protection to cables which are already tensioned. Among other things, a method is known in which the tension members are provided with formwork, so that the tension member comes to rest within a tube formed by the formwork, the annular gap between the tension member and formwork with an elastomer, grease or cement paste is filled. On the one hand, these formworks can be removed after the elastomer has hardened, or else they weld together with the elastomer and remain as a further jacket around the tension member.

Der Nachteil des Standes der Technik, liegt darin, daß keine Kontrollmöglichkeit mehr vorliegt, in­wieweit die bereits bestehende Korrosion vorange­schritten ist bzw. neue Schadensherde auftreten.The disadvantage of the prior art is that there is no longer any possibility of checking to what extent the already existing corrosion has progressed or to what extent new sources of damage are occurring.

Desweiteren kann der Fachmann keine Garantie dafür geben, daß in den Drahtzwischenräumen der Zugglieder Lufteinschlüsse vorliegen.Furthermore, the expert can give no guarantee that there are air pockets in the wire interstices of the tension members.

Ferner ist ein Verfahren bekannt, daß vorschlägt, die Zugglieder mit einer Umhüllung aus Stahlblech zu umgeben, wobei der Ringspalt zwischen Umhüllung und Zugglied mit einer Flüssigkeit gefüllt wird, in der gegen Korrosion schützende Additiva gelöst sind. Ferner sind dieser Flüssigkeit feuchtig­keitsunterwandernde korrosionshindernde Beimischungen zugesetzt, die die Feuchtigkeit lösen und innerhalb der Flüssigkeit zum Absinken bringen.Furthermore, a method is known that proposes to surround the tension members with a cover made of sheet steel, the annular gap between cover and tension member being filled with a liquid in which additives protecting against corrosion are dissolved. This liquid also contains moisture-penetrating, corrosion-preventing additives which dissolve the moisture and cause it to sink within the liquid.

Ein solches Verfahren ist sehr aufwendig und mit hohen Wartungskosten belastet, da die ständig vor­handene Korrosionsschutzflüssigkeit auch die einge­ setzten Abdichtungselemente beeinträchtigt. Des­weiteren muß am Ende der Zugglieder ein Ausgleichs­gefäß angeordnet sein, das die Füllstände der Ring­spalten konstant hält. Ein weiterer Nachteil eines solchen Verfahrens liegt darin, daß zur Kontrolle des Systems eine Alarmeinrichtung erforderlich ist, die eine Leckage an der Ummantelung weitermeldet.Such a method is very complex and is burdened with high maintenance costs, since the corrosion protection liquid which is always present also the one set sealing elements impaired. Furthermore, a compensation vessel must be arranged at the end of the tension members, which keeps the filling levels of the annular gaps constant. Another disadvantage of such a method is that an alarm device is required to control the system, which further reports a leak in the casing.

Der ständig bereitzustellende Überdruck im Ringspalt bei vorgenannten Verfahren erweist sich ebenfalls als sehr kostenintensiv.The constant pressure to be provided in the annular gap in the aforementioned methods also proves to be very cost-intensive.

Im Einzelnen wird zum Stand der Technik auf folgende Literaturstellen hingewiesen:
Die DE-PS 33 43 352 beschreibt ein Verbundkabel für Spannbetonwerke, bei dem das Hüllrohr aus einzelnen Stahlrohrabschnitten zusammengesetzt ist, die an ihren Enden Außengewinde tragen und mit Gewindemuffen mitein­ander verschraubt sind, wobei die trompetenförmigen Er­weiterungen je einen einstückigen Stahlkörper aufweisen, der ein Ansatzrohr mit einem Außengewinde zur Verschrau­bung mit dem Hüllrohr und weitere Abschlußstücke auf­weist.In detail, reference is made to the following references regarding the state of the art:
DE-PS 33 43 352 describes a composite cable for prestressed concrete plants, in which the cladding tube is composed of individual steel tube sections which have external threads at their ends and are screwed together with threaded sockets, the trumpet-shaped extensions each having a one-piece steel body which has an extension tube has an external thread for screwing to the cladding tube and other end pieces.

Die DE-OS 34 37 107 beschreibt ein zwischen Bauteilen gespanntes und gegenüber diesen verankertes Zugglied, insbesondere Schrägseil für eine Schrägseilbrücke, aus einer Anzahl von gemeinsam in einer rohrförmigen Umhüllung angeordneten Einzelelementen, wobei die Hohlräume zwischen den Einzelelementen und der rohrförmigen Umhüllung von nach dem Spannen des Zuggliedes eingebrachtem Material z.B. Zementmörtel ausgefüllt sind und die Einzelelemente auf ihre gesamte Länge einschließlich ihres Verlaufs in­nerhalb der Verankerungsvorrichtungen mit einer Beschich­tung aus Kunststoff versehen sind.DE-OS 34 37 107 describes a tension member tensioned between components and anchored relative to them, in particular stay cable for a cable-stayed bridge, from a number of individual elements arranged together in a tubular envelope, the cavities between the individual elements and the tubular envelope from after tensioning material introduced into the tension member, for example cement mortar, and the individual elements are provided with a coating of plastic over their entire length including their course within the anchoring devices.

Die DE-OS 34 37 350 beschreibt ein Kabel für Bauwerke, insbesondere Schrägkabelbrücken, aus mehreren gebündel­ten Zugelementen, die von einem Hüllrohr umgeben sind, wobei der Hohlraum zwischen Zugelementen und Hüllrohr mit einem Injiziermaterial, vorzugsweise Zementmörtel verpresst ist und das Hüllrohr aus zumindest einem Material­streifen geformt ist und an aneinandergrenzenden Streifen­längskanten je eine Falznaht aufweist.DE-OS 34 37 350 describes a cable for buildings, in particular inclined cable bridges, consisting of several bundled tension elements which are surrounded by a cladding tube, the cavity between tension elements and cladding tube being pressed with an injection material, preferably cement mortar, and the cladding tube made of at least one strip of material is formed and each has a seam at adjacent strip longitudinal edges.

Schließlich beschreibt die DE-PS 36 29 704 einen Korro­sionsschutz für ein aus stählernen Seilen, Paralleldraht­bündeln oder Parallellitzenbündeln gebildetes Zugglied, bei dem die Umhüllung mit Hilfe von Abstandhaltern in einem Abstand vom Zugglied gehalten wird, so daß sich ein das Zugglied umgebender Ringspalt ergibt und am oberen Ende der Umhüllung eine Ausgleichsdehnvorrichtung ange­ordnet ist, ferner der Ringspaltraum mit einer Korrosions­schutzflüssigkeit gefüllt ist und diese feuchtigkeits­unterwandernde und korrosionshindernde Beimischungen in Form von Gasphaseninhibitoren enthält, der Ringspalt an beiden Enden des Zuggliedes gegen diesen abgedichtet ist, sich ferner am oberen Ende des Zuggliedes ein Ausgleichs­gefäß befindet und oberhalb des Ausgleichsgefäßes eine aus eintretender Luft Feuchtigkeit herausziehende Silikat­gelschleuse angeordnet ist.Finally, DE-PS 36 29 704 describes corrosion protection for a tension member formed from steel ropes, parallel wire bundles or parallel strand bundles, in which the sheathing is held at a distance from the tension member with the aid of spacers, so that an annular gap surrounding the tension member results and on A compensating expansion device is arranged at the upper end of the sheathing, furthermore the annular gap is filled with a corrosion protection liquid and this contains moisture-infiltrating and corrosion-preventing admixtures in the form of gas phase inhibitors, the annular gap is sealed against this at both ends of the tension member, and a compensation vessel is also located at the upper end of the tension member is located and a silica gel sluice that draws moisture out of the incoming air is arranged above the expansion tank.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Gattung zu schaffen, wobei die Beseitig von Korrosions­bildnern innerhalb der Zugglieder sowie eine zuverlässige Kontrolle ohne hohe Wartungskosten ermöglicht wird.In contrast, the invention is based on the object of providing a method and a device of the type mentioned at the outset, the elimination of corrosion formers within the tension members and a reliable control being possible without high maintenance costs.

Die Aufgabe wird durch die Maßnahmen und Inhalte der beiliegenden Patentansprüche gelöst.The task is solved by the measures and content of the enclosed patent claims.

Als Überzugsmittel können sich auch Zwei-Komponenten-Harze eignen, wobei diese vor dem Erhärten wieder abgelassen werden. Hierzu eignen sich beispielsweise Zwei-Komponenten-­Harze, die eine Abbindezeit von beispielsweise 10 Stunden aufweisen.Two-component resins can also be suitable as coating agents, these being drained off again before hardening. For this purpose, two-component resins are suitable, for example, which have a setting time of, for example, 10 hours.

Als flüssige Überzugsmittel eignen sich gegebenenfalls ferner auch Wachse, insbesondere Esterwachse, die sowohl hydrophile aus auch hydrophobe Komponenten im Molekül enthalten.Waxes, in particular ester waxes, which contain both hydrophilic and hydrophobic components in the molecule are also suitable as liquid coating agents.

Bei der Ausführungsform, bei der der Ringraum eine Gas­füllung aufweist, die auf Dauer mit einem Überdruck ver­sehen ist, kann gegebenenfalls die Gasfüllung ganz oder teilweise auch durch ein sogenanntes Fluid ersetzt sein, also beispielsweise durch eine vorzugsweise leicht beweg­liche Flüssigkeit.In the embodiment in which the annular space has a gas filling which is permanently provided with an overpressure, the gas filling can optionally also be replaced in whole or in part by a so-called fluid, that is to say, for example, by a preferably easily movable liquid.

Anhand den beigefügten Zeichnungen, die ein besonders bevorzugtes Ausführungsbeispiel der Erfindung zeigen, wird diese nun näher erläutert. Dabei zeigen:

  • Figur 1 ein dieses Verfahren betreffendes Brücken­bauwerk;
  • Figur 2 bis 6 Querschnitte durch ein mit Schutzrohr versehenes Zugglied.
With reference to the accompanying drawings, which show a particularly preferred embodiment of the invention, this will now be explained in more detail. Show:
  • 1 shows a bridge structure relating to this method;
  • Figure 2 to 6 cross sections through a tension member provided with a protective tube.

Figur 1 zeigt ein Brückenbauwerk 8, das mit Zugglieder 3, vorzugsweise aus stählernen Seilen bestehend, verspannt ist.Figure 1 shows a bridge structure 8, which is tensioned with tension members 3, preferably consisting of steel ropes.

Die Zugglieder 3 werden mit einem Schutzrohr 4 um­hüllt. Vorzugsweise sind die Schutzrohre 4 im Bereich des Hochpunktes 7 des Brückenbauwerks 8 dicht ver­schlossen, während im Tiefpunktbereich 9 des Brücken­bauwerks 8 die Schutzrohre 4 in eine Saug- bzw. Pump­vorrichtung 10 münden.The tension members 3 are covered with a protective tube 4. The protective tubes 4 are preferably tightly closed in the area of the high point 7 of the bridge structure 8, while in the low point area 9 of the bridge structure 8 the protective tubes 4 open into a suction or pump device 10.

Die Saug- und Pumpvorrichtung 10 kann hierbei so ausgebildet sein, daß sie zum Ansetzen einer Pumpe dient. Hierbei ist jedoch darauf zu achten, daß nach dem Abnehmen der Pumpe das Anschlußelement dicht abschließt.The suction and pumping device 10 can be designed in such a way that it serves to attach a pump. However, make sure that the connection element is tightly sealed after removing the pump.

Figur 2 zeigt einen Querschnitt durch ein Zugglied 3, das mit einem Schutzrohr 4 umhüllt ist. Der Ringraum 1 wird durch Abstandshalter 6 geschaffen.Figure 2 shows a cross section through a tension member 3, which is covered with a protective tube 4. The annular space 1 is created by spacers 6.

Durch die Erzeugung eines Vakuums und Erwärmen des Zugglieds 3 werden Wasserdampf 11 und weitere Korrosionsbildner 12 aus dem Innern des Zuggliedes 3 abgezogen (siehe Figur 3).By creating a vacuum and heating the tension member 3, water vapor 11 and further corrosion formers 12 are drawn off from the interior of the tension member 3 (see FIG. 3).

Anhand der gemessenen Konzentration des abgezogenen Mediums wird ein Rückschluß über die noch vorhandenen Bestandteile im Zuggliedinnern gewähr­leistet.Based on the measured concentration of the withdrawn medium, conclusions about the constituents still present inside the tension member are guaranteed.

Ist das abgezogene Medium frei von korrosionsbildenden Bestandteilen, so wird der Ringraum 1 wiederum unter Vakuum mit einem Überzugsmittel 2, vorzugsweise aus Kunstharz gefüllt (siehe Figur 4).If the medium removed is free from corrosion-forming constituents, the annular space 1 is again filled under vacuum with a coating agent 2, preferably made of synthetic resin (see FIG. 4).

Ein besonderer Vorteil dieses Verfahrens liegt darin, daß unter Begünstigung des Vakuums das Überzugsmittel 2 in die Zwischenräume 13 des Zugglieds 3 eindringt und somit die Einzelzugglieder 3a, 3b usw. beschichtet.A particular advantage of this method is that the coating agent 2 penetrates into the spaces 13 of the tension member 3 while favoring the vacuum and thus coats the individual tension members 3a, 3b etc.

Hiernach wird das Überzugsmittel 2 wieder aus dem Schutzrohr 4 entleert, so daß das Zugglied 3 mit seinen Einzelzuggliedern 3a, 3b usw. mit dem Überzugsmittel 2 beschichtet ist, jedoch der Ringraum 1 erhalten bleibt (Fig. 5).Thereafter, the coating agent 2 is emptied again from the protective tube 4, so that the tension member 3 with its individual tension members 3a, 3b etc. is coated with the coating agent 2, but the annular space 1 is retained (Fig. 5).

Dies ist besonders wichtig, da der vorhandene Ring­raum 1 zu späteren Kontrollzwecken erhalten bleibt. Figur 5a zeigt eine Vergrößerung des in Figur 5 mit "A" gekennzeichneten Detail.This is particularly important since the existing annular space 1 is retained for later control purposes. FIG. 5a shows an enlargement of the detail labeled "A" in FIG.

In einem gewählten Wartungszyklus kann der so erhaltene Ringraum 1 beliebig mit einem Kontrollmedium, d.h. einem Kontrollfluid oder einer Kontrollflüssigkeit 5 be­füllt werden (Fig. 6) das dann auf ihre Bestandteile (eventuell auftretende Korrosionsbildner) analysiert wird.In a selected maintenance cycle, the annular space 1 thus obtained can be mixed with a control medium, i.e. a control fluid or a control liquid 5 are filled (FIG. 6), which is then analyzed for its constituents (any corrosion agents that may occur).

Bei erneut auftretender Korrosion kann dieses Verfahren beliebig of wiederholt werden.If corrosion occurs again, this process can be repeated any number of times.

Claims (10)

1. Verfahren zur Erneuerung des Korrosionsschutzes von Zuggliedern von Brücken und gleichartig verspannten Bauwerken, gekennzeichnet durch folgende Verfahrens­schritte a) der beschädigte Korrosionsschutz, beispielsweise eine Kunststoffbeschichtung oder Schutzanstriche, werden mindestens teilweise entfernt, b) die freigelegten Stahldrähte werden von eventuellem Rost befreit, c) das Zugglied wird mit einer gasdichten Umhüllung versehen, wobei durch Abstandhalter ein in allen Rich­tungen durchgehender Ringraum geschaffen wird, d) die im Zugglied vorhandene Feuchtigkeit wird durch Erzeugen eines Unterdrucks und/oder durch Erwärmung des Zugglieds zum Verdampfen gebracht und der Wasserdampf kontinuierlich mittels der den Unterdruck erzeugenden Va­kuumpumpe abgesaugt, bis sich ein Unterdruck-Minimum konstant einstellt, e) der Ringraum wird mit einem flüssigen Überzugsmittel aufgefüllt, f) nach Füllung des Ringraums wird das noch flüssige Überzugsmittel am Tiefpunkt der Umhüllung über ein Ventil abgelassen, während am Hochpunkt der Umhüllung durch ein weiteres Ventil ein trockenes Gas eingezogen wird, wobei das Zugglied mit einer dünnen Schicht des Überzugsmittels beschichtet bleibt, g) das Einlaß- und das Auslaßventil werden geschlossen. 1. Process for renewing the corrosion protection of tension members of bridges and similarly braced structures, characterized by the following process steps a) the damaged corrosion protection, for example a plastic coating or protective coatings, is at least partially removed, b) the exposed steel wires are freed of any rust, c) the tension member is provided with a gas-tight envelope, an annular space being created in all directions by spacers, d) the moisture present in the tension member is caused to evaporate by generating a vacuum and / or by heating the tension member and the water vapor is continuously drawn off by means of the vacuum pump generating the vacuum until a vacuum minimum is constant, e) the annular space is filled with a liquid coating agent, f) after the annular space has been filled, the still liquid coating agent is discharged via a valve at the low point of the casing, while a dry gas is drawn in through the valve at the high point of the casing, the traction member remaining coated with a thin layer of the coating material, g) the inlet and outlet valves are closed. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß als gasdichte Umhüllung eine solche aus Edelstahl­blech eingesetzt wird.2. The method according to claim 1,
characterized,
that such a stainless steel sheet is used as a gas-tight envelope. 3. Verfahren nach Anspruch 1 - 2,
dadurch gekennzeichnet,
daß der Ringraum vollständig mit einem flüssigen Über­zugsmittel aufgefüllt wird.3. The method according to claim 1-2,
characterized,
that the annulus is completely filled with a liquid coating agent. 4. Verfahren nach Anspruch 1 - 3,
dadurch gekennzeichnet,
daß als flüssiges Überzugsmittel Kunstharz eingesetzt wird.4. The method according to claim 1-3,
characterized,
that synthetic resin is used as the liquid coating agent. 5. Verfahren nach Anspruch 1 - 4,
dadurch gekennzeichnet,
daß als trockenes Gas Luft und/oder Stickstoff eingezogen wird.5. The method according to claim 1-4,
characterized,
that air and / or nitrogen is drawn in as the dry gas. 6. Verfahren nach Anspruch 1 - 5,
dadurch gekennzeichnet,
daß das entrostete Zugglied vor Herstellung der Umhüllung mit einem temporären Korrosionsschutz z.B. einem Schutz­anstrich versehen wird.6. The method according to claim 1-5,
characterized,
that the derusted tension member is provided with a temporary corrosion protection, for example a protective coating, before the casing is produced. 7. Verfahren nach Anspruch 1 - 6,
dadurch gekennzeichnet,
daß das flüssige Überzugsmittel mit Hilfe des Vakuums in den Ringraum eingezogen wird.7. The method according to claim 1-6,
characterized,
that the liquid coating agent is drawn into the annular space with the aid of the vacuum. 8. Verfahren nach Anspruch 1 - 7,
dadurch gekennzeichnet,
daß die Gasfüllung des Ringraums aus Dauer mit einem Überdruck versehen wird, um Leckageverluste auszu­gleichen und
daß der Überdruck durch ein automatisches Alarm- und Meldesystem überwacht wird.8. The method according to claim 1-7,
characterized,
that the gas filling of the annular space is permanently provided with an overpressure to compensate for leakage losses and
that the overpressure is monitored by an automatic alarm and reporting system. 9. Verfahren nach Anspruch 1 - 8,
dadurch gekennzeichnet,
daß in konstanten oder unregelmäßigen Zeitabständen z.B. einmal jährlich, die Gasfüllung im Ringraum des Zugglieds mit einem Massenspektrometer auf Vorhanden­sein korrosionserzeugender Stoffe überprüft wird.9. The method according to claim 1-8,
characterized,
that the gas filling in the annulus of the tension member is checked with a mass spectrometer for the presence of corrosive substances at constant or irregular intervals, for example once a year. 10. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 - 9,
dadurch gekennzeichnet,
daß die Umhüllung als Schutzrohr (4) an den Enden abge­dichtet ist und Anschlüsse für die Saug- und Pumpvor­richtung angeordnet sind.10. Apparatus for performing the method according to claims 1-9,
characterized,
that the casing is sealed as a protective tube (4) at the ends and connections for the suction and pumping device are arranged.
EP89112544A 1988-07-15 1989-07-10 Process for renovating the corrosion prevention of tension elements of bridges or similar stayed constructions, and apparatus for carrying out this process Withdrawn EP0350822A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823964 1988-07-15
DE19883823964 DE3823964A1 (en) 1988-07-15 1988-07-15 METHOD FOR RENEWING THE CORROSION PROTECTION OF TENSION LINES OF BRIDGES AND SIMILAR TENSIONED CONSTRUCTIONS, AND DEVICE FOR IMPLEMENTING THE METHOD

Publications (2)

Publication Number Publication Date
EP0350822A2 true EP0350822A2 (en) 1990-01-17
EP0350822A3 EP0350822A3 (en) 1990-04-18

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FR2725462A1 (en) * 1994-10-06 1996-04-12 Dyckerhoff & Widmann Ag PROCESS FOR CLEANING AND DECLARING LIMITS OF LIMITED LENGTH OF STRANDS OF STEEL WIRE
WO1998040561A1 (en) * 1997-03-12 1998-09-17 Eps Schaub Gmbh Cable anticorrosion device
EP1033443A1 (en) * 1999-03-01 2000-09-06 Baudin-Chateauneuf Cable covered with a heat shrinkable web
FR2790492A1 (en) * 1999-03-01 2000-09-08 Baudin Chateauneuf Shrouding for cables consists of one or more strips wrapped round cables using heat shrinking material with edge lips forming beading when brought together to be held by slide
WO2011044611A1 (en) * 2009-10-14 2011-04-21 The Roads And Traffic Authority Of New South Wales A bridge construction and method for modifying strain characteristics of a bridge
US8042213B2 (en) * 2007-10-30 2011-10-25 Ihi Infrastructure Systems Co., Ltd. Device and method for preventing rusting of cable for supporting bridge
US20130007966A1 (en) * 2010-03-26 2013-01-10 Vsl International Ag Strand guiding device
CN106439138A (en) * 2016-10-25 2017-02-22 深圳市科兰德实业发展有限公司 Constant-pressure valve capable of enabling partial pressure of water vapor to be constant
CN107869466A (en) * 2017-11-07 2018-04-03 肖叶 A kind of water pump for being conveniently replaceable screen pack
CN108487050A (en) * 2018-03-22 2018-09-04 谢志坚 A kind of bridge pedestal telescopic device based on municipal science of bridge building
CN111945562A (en) * 2020-08-12 2020-11-17 郑州大学 Dehumidification method of main cable of suspension bridge
CN113389134A (en) * 2021-06-07 2021-09-14 中建三局第一建设工程有限责任公司 Steel plate strip suspension bridge and construction method thereof
CN114232478A (en) * 2021-09-06 2022-03-25 郑州大学 Efficient dehumidification method for main cable of suspension bridge

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725462A1 (en) * 1994-10-06 1996-04-12 Dyckerhoff & Widmann Ag PROCESS FOR CLEANING AND DECLARING LIMITS OF LIMITED LENGTH OF STRANDS OF STEEL WIRE
AT407767B (en) * 1994-10-06 2001-06-25 Dyckerhoff & Widmann Ag METHOD FOR CLEANING AND EXPOSING LENGTH-LIMITED SECTIONS OF STRANDS FROM STEEL WIRE
WO1998040561A1 (en) * 1997-03-12 1998-09-17 Eps Schaub Gmbh Cable anticorrosion device
EP1033443A1 (en) * 1999-03-01 2000-09-06 Baudin-Chateauneuf Cable covered with a heat shrinkable web
FR2790493A1 (en) * 1999-03-01 2000-09-08 Baudin Chateauneuf PROTECTION OF CABLE BEAMS BY HEAT SHRINK TAPE, PARTICULARLY WITH LIPS AND SLIDE
FR2790492A1 (en) * 1999-03-01 2000-09-08 Baudin Chateauneuf Shrouding for cables consists of one or more strips wrapped round cables using heat shrinking material with edge lips forming beading when brought together to be held by slide
US8042213B2 (en) * 2007-10-30 2011-10-25 Ihi Infrastructure Systems Co., Ltd. Device and method for preventing rusting of cable for supporting bridge
WO2011044611A1 (en) * 2009-10-14 2011-04-21 The Roads And Traffic Authority Of New South Wales A bridge construction and method for modifying strain characteristics of a bridge
CN102713070A (en) * 2009-10-14 2012-10-03 道路和海上服务 A bridge construction and method for modifying strain characteristics of a bridge
US8650691B2 (en) * 2010-03-26 2014-02-18 Vsl International Ag Strand guiding device
US20130007966A1 (en) * 2010-03-26 2013-01-10 Vsl International Ag Strand guiding device
CN106439138A (en) * 2016-10-25 2017-02-22 深圳市科兰德实业发展有限公司 Constant-pressure valve capable of enabling partial pressure of water vapor to be constant
CN106439138B (en) * 2016-10-25 2019-04-09 深圳市科兰德实业发展有限公司 A kind of constant pressure valve of constant steam partial pressure
CN107869466A (en) * 2017-11-07 2018-04-03 肖叶 A kind of water pump for being conveniently replaceable screen pack
CN108487050A (en) * 2018-03-22 2018-09-04 谢志坚 A kind of bridge pedestal telescopic device based on municipal science of bridge building
CN111945562A (en) * 2020-08-12 2020-11-17 郑州大学 Dehumidification method of main cable of suspension bridge
CN111945562B (en) * 2020-08-12 2022-07-01 郑州大学 Dehumidification method of main cable of suspension bridge
CN113389134A (en) * 2021-06-07 2021-09-14 中建三局第一建设工程有限责任公司 Steel plate strip suspension bridge and construction method thereof
CN114232478A (en) * 2021-09-06 2022-03-25 郑州大学 Efficient dehumidification method for main cable of suspension bridge
CN114232478B (en) * 2021-09-06 2023-09-15 郑州大学 Efficient dehumidification method for main cable of suspension bridge

Also Published As

Publication number Publication date
DE3823964A1 (en) 1990-02-22
DE3823964C2 (en) 1990-06-28
EP0350822A3 (en) 1990-04-18

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