Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B11/00—Rail joints
  • E01B11/54—Electrically-insulating rail joints

Definitions

• the invention relates to an electrically insulating rail butt joint, in which the butting surfaces of the rails and the connecting surfaces for the connecting straps are provided with electrically insulating intermediate layers, whereupon the butting surfaces and, if appropriate, the straps are glued and / or screwed, and to a method for producing one electrically insulating rail butt joint, in which the rail joints are glued with the interposition of an insulating intermediate layer and glued or screwed with tabs.
• an electrically insulating rail butt joint of the type mentioned has become known, in which a fabric soaked with adhesive, in particular a glass fiber fabric, is used as the electrically insulating intermediate layer.
• a fabric soaked with adhesive in particular a glass fiber fabric
• AT-PS 323 225 conditions are set for the ball pressure hardness of the intermediate layer, which subsequently gives the connection not only the appropriate compressive strength but also with regard to the special choice should also give the adhesive a certain minimum tensile strength.
• the known rail butt joint according to AT-PS 377 808 is characterized by improved resistance moments of the butt joint and improved swell bending strength compared to the older design, but a relatively thick intermediate layer is still required in order to maintain not only the high-strength adhesive connection but also a correspondingly robust insulation.
• the butt joint had to be pretensioned during the period of hardening of the plastic held, and in view of the high demands with regard to the compressive or tensile strength of the adhesive, it took a relatively long time for the adhesive to harden.
• a rail butt joint has become known in which a shock bridge covered with electrical insulating material is arranged under the rail butt to prevent the deformation of the rail butt.
• This shock bridge is also intended to prevent excessive wear of the plastic profile, which is introduced into the joint between the rails.
• the invention now aims to provide an electrically insulating rail butt joint in which the electrically insulating intermediate layer which can already be applied at the factory can be kept relatively thin, remains stable even at high and low temperatures, and in which any rapidly curing adhesives are subsequently used can and thus the time which can be significantly reduced for the production of such rail butt joints and the time of the interruption of rail traffic when repairing such rail butt joints.
• the rail according to the invention essentially consists in that the electrically insulating Intermediate layer as a coating of ceramic material, in particular Al2O3, is applied to the abutting surfaces of the rails and on the tabs.
• any adhesives can be selected according to other criteria and, in particular, fast-curing adhesives can be used, which can significantly reduce the time when traffic is interrupted in the event of repair work or the time it takes to produce such insulating rail butt joints.
• the coating as a powder coating is advantageously applied to the abutting surfaces of the rails for the rail butt joint according to the invention, on the abutting surfaces and / or the tabs.
• a flame-sprayed coating made of ceramic material can be made extremely pressure-resistant and quick-setting adhesives can be applied to this ceramic insulating layer, which is already arranged on the rail at the factory, in order to enable the repair or the production of the electrically insulating rail butt joint.
• the butt joint is significantly reduced by the choice of such coatings, so that the mechanical stress from rolling traffic is reduced.
• such a ceramic coating as that can be applied for example by flame spraying, to ensure that the insulation remains constant and secure over a wide temperature range, and in particular between + 70 ° C and -30 ° C.
• adhesives can be selected which do not have to have insulating properties, and taking into account the fact that the electrical insulation is carried out by the coating applied directly to the rail fast setting adhesives are used, which can absorb high shear forces and result in a short manipulation time.
• a rail prepared in this way is particularly suitable for use in the open field and with consideration of the use of higher-quality adhesives, which can be selected without considering their insulating ability, the service life is extended compared to conventional training.
• the inventive method for producing an electrically insulating rail joint connection of the type mentioned is carried out so that the rail joint surfaces and the tab surfaces and / or the holes for the screw connection of the tabs to the rails with an insulating, corrosion-resistant and mechanically highly resilient material, in particular by flame spraying , coated, whereupon quick-curing adhesives are used to complete the electrically insulating rail butt joint.
• the manufacture of the insulating, corrosion-resistant and mechanically highly resilient coating is already carried out at the factory, as already mentioned, so that the method is particularly suitable for rapid renovation in the construction site area.
• the procedure is advantageously such that a ceramic, in particular oxide-ceramic, material, in particular Al2O3, which is applied by flame coating or flame spraying, is used as the corrosion-resistant, mechanically heavy-duty material.
• the use of ceramic material in the railway industry is already known in particular as a material for the sliding surface of sliding chairs in railway switches.
• the powdered coating materials for example a mixture of 80 to 90% Al2O3 and 10 to 20% TiO2, are applied to the surface to be coated by means of a flame spray gun.
• the layer thickness of the protective layer can be approximately 0.5 to 5 mm, with extremely small layer thicknesses having proven to be sufficient.
• the layer thickness of the adhesive which now does not have to perform any insulation tasks, can be minimized, as a result of which the whole connection is able to absorb higher tensile and shear forces.
• the adhesive can be introduced into the space between the rail and the bracket, or between the holes and screws under pressure, so that these spaces are filled up.
• the ceramic layers applied by such flame spraying are notable for very low porosity and therefore ensure complete insulation of the connection even with different moisture levels and with different electrical properties of the adhesive used.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Connection Of Plates (AREA)
• Machines For Laying And Maintaining Railways (AREA)
• Insulating Bodies (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=3505173

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (3)

Family Cites Families (1)

• 1986
  • 1986-04-18 AT AT103286A patent/AT386631B/de not_active IP Right Cessation
• 1987
  • 1987-04-02 EP EP87890063A patent/EP0242350A3/fr not_active Ceased

Patent Citations (3)

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