EP0937841B1 - Méthode de restauration de constructions en acier - Google Patents

Méthode de restauration de constructions en acier Download PDF

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Publication number
EP0937841B1
EP0937841B1 EP99100689A EP99100689A EP0937841B1 EP 0937841 B1 EP0937841 B1 EP 0937841B1 EP 99100689 A EP99100689 A EP 99100689A EP 99100689 A EP99100689 A EP 99100689A EP 0937841 B1 EP0937841 B1 EP 0937841B1
Authority
EP
European Patent Office
Prior art keywords
steel
gap
corrosion products
corrosion
elements
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 - Lifetime
Application number
EP99100689A
Other languages
German (de)
English (en)
Other versions
EP0937841A1 (fr
Inventor
Heinrich Dr. Pohlmann
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.)
Starkstrom-Anlagen-Gesellschaft mbH
Original Assignee
Starkstrom-Anlagen-Gesellschaft mbH
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 Starkstrom-Anlagen-Gesellschaft mbH filed Critical Starkstrom-Anlagen-Gesellschaft mbH
Publication of EP0937841A1 publication Critical patent/EP0937841A1/fr
Application granted granted Critical
Publication of EP0937841B1 publication Critical patent/EP0937841B1/fr
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

Definitions

  • steel structure means, in particular, lattice trusses made of steel elements which are mounted with the aid of screw and / or rivet connections. These lattice trusses are mainly found on high-voltage overhead line pylons.
  • Such steel structures with an age of more than 40 years generally consist of so-called black steel (structural steel or carbon steel) and have been provided with multiple coatings, for example red lead and a top layer, to prevent corrosion.
  • black steel structural steel or carbon steel
  • red lead and a top layer to prevent corrosion.
  • corrosion products can be observed to a considerable extent today, particularly in the gap areas between the steel elements connected by screw and / or rivet connections. This phenomenon is also called crevice corrosion.
  • crevice corrosion occurs in particular in the gap areas in which a relatively large distance of the screw and / or rivet perforations from the steel element edge or the gap opening is specified. Local crevice corrosion can be observed primarily in these areas.
  • the crevice corrosion leads to steel erosion in the gap with each other connected steel elements and the so-called blooming of the corrosion products leads to a disadvantageous widening of the gap.
  • the gaps that widen over time can have a gap width of up to a few centimeters. If the steel elements are connected via screw and / or rivet connections, the widening of the gap leads to considerable axial stress on the screws and / or rivets.
  • the invention is based on the technical problem of specifying a method of the type mentioned at the outset with which long-term corrosion protection between the steel elements connected to one another is ensured in a manner which is not very time-consuming, costly or expensive.
  • the invention teaches a method of the type mentioned, which is characterized by the steps in claim 1.
  • a preferred embodiment of the invention is characterized in that the steel elements are designed as steel profiles and connecting steel sheets, the connecting steel sheets being mounted on the steel profiles via screw and / or rivet connections and the corrosion products being removed from the gap areas between steel profiles and connecting steel sheets.
  • the connecting steel sheet is in particular a so-called gusset plate that is preferably used to connect steel profiles in steel structures of high-voltage overhead line pylons. For example, such a gusset plate is arranged diagonally in the intersection area Steel profiles of these steel structures are used.
  • the respective gap area or the associated gap is widened before the corrosion products are removed.
  • the gap can expediently be widened with the aid of a wedge or chisel.
  • the gap is opened by about 1 cm.
  • a preferred embodiment which is of particular importance in the context of the invention, is characterized in that the corrosion products are removed from the gap areas by mechanical treatment, preferably using a jigsaw.
  • Jigsaws with different setting of the saw blades are expediently used, with which the corrosion products can be reliably worked out of the gap areas.
  • the mechanical removal of the corrosion products is the preferred embodiment of the invention, it is nevertheless also within the scope of the invention to remove the corrosion products from the gap areas by thermal treatment, preferably with the aid of a cutting torch.
  • the thermal treatment preferably with the cutting torch, the corrosion products are burned in the gap areas.
  • it is expediently guided parallel along the steel elements at a short distance.
  • a rivet head cutter used to remove rivets which has a corresponding one, is expediently used as the cutting torch Has burner nozzle used.
  • porous corrosion products which can be found in the gap areas of weatherproof structural steels, can be effectively burned out by the thermal treatment.
  • mechanical treatment is preferred for high density corrosion products and therefore this mechanical treatment is the preferred embodiment of the invention.
  • the invention is based initially on the knowledge that the corrosion products present in the gap areas can be removed very completely even in the assembled state of the steel elements, without the need for complex disassembly of the steel elements.
  • This removal of the corrosion products preferably by mechanical treatment, is possible since the corrosion products form in particular in gap areas which adjoin the outer edges of the steel elements or are easily accessible from the outside.
  • the time-consuming dismantling of the steel elements and the time-consuming removal of the corresponding connecting means are eliminated. For example, a time-consuming and labor-intensive removal of rivets by separating the rivet head and driving out the rivet shaft is not necessary.
  • the gap width of a gap area is reduced with a clamping device after removal of the corrosion products.
  • clamps can expediently be used. It goes without saying that this gap width reduction is carried out before the seam according to the invention is applied and the gap width is set up in such a way that the seam can be reliably attached to the gap opening. It is within the scope of the invention to reduce the gap width in particular when the corresponding gap has been widened beforehand and in accordance with a preferred embodiment of the invention for the removal of the corrosion products. However, the gap width reduction is especially necessary when there are larger gap widths that result from the so-called blooming of the corrosion products.
  • the seam is designed as a weld seam, advantageously as a fillet weld. It is within the scope of the invention that this seam is applied relatively thinly at the edges of the gap areas, always with the proviso that the gap opening is sealed moisture-tight so that corrosive liquids cannot penetrate into the gap openings.
  • the weld seam In the case of gap areas which are formed between interconnected steel elements, for example between steel profiles and connecting steel sheets mounted thereon, it is not necessary for the weld seam to be designed in accordance with the mechanical loads which this connection has to take up. These mechanical stresses are regularly absorbed by the connecting means, in particular the screw and / or rivet connections. It is within the scope of the invention that the entire gap opening between or in steel elements is closed with the seam according to the invention.
  • the surfaces to which the seam is to be applied are preferably ground before the seam is applied. This ensures, in particular, a functionally reliable hold of the seam applied according to the invention.
  • At least one corrosion-inhibiting and / or hydrophobic substance is introduced into the gap areas.
  • the at least one substance is expediently introduced after the gap width has been reduced.
  • Red lead and / or zinc pigments can be used as corrosion-inhibiting substances.
  • oils and / or waxes are expediently introduced into the gap areas. It is within the scope of the invention to introduce curing substances, for example epoxy resins and / or polyurethanes, into the gap areas.
  • a thin, low-viscosity rust-sealing liquid based on moisture-curing polyurethanes is introduced as a corrosion protection agent into the gap areas.
  • This rust sealing liquid penetrates particularly effectively into thin and dense layers of rust.
  • the moisture contained in the rust is split off as a gas and evaporates with the solvent of the rust sealing liquid.
  • the pores of the grate are filled with polyurethane and sealed.
  • the substances mentioned are introduced into the gap areas after the gap opening has been closed.
  • at least one borehole is expediently introduced into a steel element, through which borehole the substances mentioned are introduced into the gap area.
  • At least one threaded bore is preferably made in a steel element, into which threaded bore a device for introducing or pressing in the substances can expediently be screwed.
  • This device can be, for example, a lubricant dispenser.
  • At least one corrosion-inhibiting and / or hydrophobic and / or hardening substance can be pressed into the cavities of the gap under pressure via the borehole or the threaded bore or via the lubricating nipple.
  • the introduction of the substances mentioned into the gap areas is expedient insofar as, after removal of the corrosion products, more or less large corrosion scars generally remain on the steel elements, so that cavities at risk of corrosion are formed, which are functionally reliable against corrosion in the long term by the substances mentioned in the process according to the invention to be protected.
  • the method according to the invention is distinguished from the known measures by a less labor-intensive and time-consuming procedure. In particular, only a small number of work tools are required to carry out the method.
  • the method according to the invention is suitable for the renovation of a wide variety of steel structures. The method is preferably used in the renovation of the steel structures or lattice structures of high-voltage overhead line masts, which are present in considerable numbers. In this area in particular, the method according to the invention offers considerable economic advantages.
  • FIG. 1 shows two assembled steel elements 1, 2 of a high-voltage overhead line mast, which are designed as a steel profile 1 and a connecting steel sheet 2 connected thereto via a screw connection 3.
  • Gap areas 4, which contain corrosion products 5, are formed between the steel elements 1, 2.
  • Fig. 1 it can be seen that by the blooming of the corrosion products 5 wide gap areas 4 have arisen between the steel elements 1, 2 and the steel elements 1, 2 have been plastically deformed thereby.
  • the corrosion products 5 in the assembled state of the steel elements 1, 2 are removed from the gap areas 4 by mechanical treatment, preferably with a jigsaw.
  • Fig. 2 shows the steel elements 1, 2 after performing the method according to the invention.
  • Fig. 3 shows a section through the edge region of a connecting steel sheet 2 of a steel structure.
  • a gap area 4 can be seen, which has arisen in the edge area of the connecting steel sheet 2 and in the interior of the connecting steel sheet 2 between the sheet metal surfaces due to corrosion.
  • Such crevice corrosion in steel sheets usually results from rolling defects that occur during the production of the steel sheets.
  • Corrosive substances can penetrate along the edges of the steel sheet along an undesirable duplication that occurs during the production of the steel sheet.
  • Fig. 3 shows that the blooming of the corrosion products 5 has led to a gap area 4 with considerable width in the connecting steel sheet.
  • the corrosion products 5 are removed from the gap area 4 by mechanical treatment and then the gap width of the gap area 4 is largely reduced with a tensioning device, preferably a clamp.
  • Fig. 4 shows the connecting steel sheet 2 after performing the method according to the invention. After reducing the gap width, a corrosion-inhibiting substance 6 was introduced into the gap area 4. The gap opening 7 arranged on the outer surface of the connecting steel sheet 2 was closed moisture-tight with the aid of a weld seam 8. in the The result is long-term corrosion protection of the connecting steel sheet 2.

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)
  • Connection Of Plates (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Heat Treatment Of Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Prevention Of Electric Corrosion (AREA)

Claims (5)

  1. Procédé de restauration de constructions métalliques, en particulier de pylônes de lignes de courant à haute tension, composées d'éléments métalliques (1, 2) montés, de zones de fentes (4) renfermant des produits de corrosion (5), étant formées entre ou dans les éléments métalliques (1, 2), les produits de corrosion (5) à l'état de montage des éléments métalliques (1, 2) étant retirés des zones de fentes (4), caractérisé en ce que l'ouverture de fente (7), disposée sur la surface extérieure des éléments métalliques (1, 2), est ensuite fermée de façon étanche à l'humidité, au moins par zones, par un cordon de soudure (8), en ce qu'au moins une forure est pratiquée dans un élément métallique (1, 2), et en ce qu'un dispositif est raccordé à la forure, dispositif par lequel est injectée, dans les zones de fentes, au moins une substance inhibitrice de corrosion et/ou hydrophobe, après la fermeture de l'ouverture de fente (7) par le cordon de soudure (8).
  2. Procédé suivant la revendication 1, caractérisé en ce que les éléments métalliques (1, 2) sont réalisés sous forme de profilés métalliques (1) et de tôles métalliques d'assemblage (2) raccordées à ces profilés (1) par l'intermédiaire de vissages et/ou de rivetages (3), et les produits de corrosion (5) sont retirés des zones de fentes (4) entre les profilés métalliques (1) et les tôles métalliques d'assemblage (2).
  3. Procédé suivant la revendication 1, caractérisé en ce que des zones de fentes (4) sont formées dans un élément métallique réalisé sous forme de tôle métallique et les produits de corrosion (5) sont retirés de ces zones de fentes (4).
  4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce que les produits de corrosion (5) sont retirés des zones de fentes (4) par traitement mécanique, de préférence à l'aide d'une scie à guichet.
  5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que la largeur d'une zone de fente (4) est réduite par un dispositif de serrage après le retrait des produits de corrosion (5).
EP99100689A 1998-02-18 1999-01-14 Méthode de restauration de constructions en acier Expired - Lifetime EP0937841B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19806710 1998-02-18
DE19806710A DE19806710C2 (de) 1998-02-18 1998-02-18 Verfahren zur Sanierung von Stahlkonstruktionen

Publications (2)

Publication Number Publication Date
EP0937841A1 EP0937841A1 (fr) 1999-08-25
EP0937841B1 true EP0937841B1 (fr) 2004-04-28

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Family Applications (1)

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EP99100689A Expired - Lifetime EP0937841B1 (fr) 1998-02-18 1999-01-14 Méthode de restauration de constructions en acier

Country Status (6)

Country Link
EP (1) EP0937841B1 (fr)
AT (1) ATE265593T1 (fr)
CZ (1) CZ294680B6 (fr)
DE (2) DE19806710C2 (fr)
HU (1) HUP9900161A3 (fr)
PL (1) PL200092B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101056737B (zh) * 2004-11-11 2010-05-05 西门子公司 通过局部作用的冷连接工艺，如铆接或螺纹连接，和激光焊接来连接构件的方法
US10828717B2 (en) 2015-09-16 2020-11-10 Nippon Steel Corporation Lap welding method of steel sheet and lap weld joint of steel sheet

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0988917B1 (fr) * 1998-09-26 2003-08-20 Siemens Aktiengesellschaft Méthode d'assemblage d'éléments par laser
CN115126327B (zh) * 2022-04-13 2023-10-20 中国能源建设集团广东省电力设计研究院有限公司 一种输电铁塔角钢加固装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4435489C2 (de) * 1994-10-04 1997-04-03 Abb Patent Gmbh Verfahren und Vorrichtung zum Auswechseln eines Hauptdiagonalstabes
DE4435488C2 (de) * 1994-10-04 1997-04-10 Abb Patent Gmbh Verfahren und Vorrichtung zum Auswechseln eines Knotenbleches

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101056737B (zh) * 2004-11-11 2010-05-05 西门子公司 通过局部作用的冷连接工艺，如铆接或螺纹连接，和激光焊接来连接构件的方法
US10828717B2 (en) 2015-09-16 2020-11-10 Nippon Steel Corporation Lap welding method of steel sheet and lap weld joint of steel sheet

Also Published As

Publication number Publication date
HUP9900161A3 (en) 2002-12-28
DE19806710C2 (de) 2001-06-28
ATE265593T1 (de) 2004-05-15
HU9900161D0 (en) 1999-03-29
PL200092B1 (pl) 2008-12-31
DE59909273D1 (de) 2004-06-03
PL331476A1 (en) 1999-08-30
CZ294680B6 (cs) 2005-02-16
DE19806710A1 (de) 1999-09-09
CZ48999A3 (cs) 1999-12-15
EP0937841A1 (fr) 1999-08-25
HUP9900161A2 (hu) 2001-02-28

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