Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B9/00—Fastening rails on sleepers, or the like
  • E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
  • E01B9/681—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by the material
  • E01B9/683—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by the material layered or composite
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
  • E01B19/003—Means for reducing the development or propagation of noise

Definitions

• the invention concerns a method and a vibration-isolating strip for laying a railway with rails which rest on a support over almost their entire length, whereby the strip, containing at least a first layer and a second layer with a different rigidity, situated on top of one another, is provided between the rails and the support.
• a strip is used consisting of a first layer with a low rigidity for the isolation of the vibrations, whereas a second layer mainly functions as a protective layer for the first layer.
• Such strips are described for example in EP-A-0 726 359 and US-A-5 011 077.
• the differences in height which may occur in the upper surface of the rails are among others due to tolerances in the height of the rails themselves, the bearing capacity of the base and the thickness of the support of the rails.
• the invention aims to remedy these disadvantages by introducing a method and a vibration-isolating strip which make it possible to lay a railway in a simple manner whereby the upper surface of the rails is very precisely aligned.
• the method and the strip according to the invention offer an additional advantage in that rails can be easily replaced by new rails which are very precisely aligned, without the necessity of breaking away the support for the rails.
• said first layer having the lowest rigidity, is compressed until its rigidity is at least of the same order of magnitude as that of said second layer.
• the first layer is compressed until its thickness amounts to 25 to 50%, and in particular 30 to 40%, of its original thickness.
• a material is selected for said first layer whose rigidity is at least five times smaller than the rigidity of said second layer.
• a material is selected for said first layer having a rigidity between
• a material is selected for said second layer with a rigidity between
• the strip according to the invention has at least a first layer and a second layer situated on top of one another whereby, when not compressed, the rigidity of said first layer is smaller than that of said second layer.
• This strip can be compressed between the rails of a railway and the support for these rails, whereby, in the compressed strip, the rigidity of said first layer is at least of the same order of magnitude as that of the second layer.
• said first layer mainly consists of a material having a rigidity which is at least five times smaller than the rigidity of said second layer.
• said first layer mainly consists of a material with a rigidity situated between 10 and 25 MN/m , and which amounts in particular to almost 20 MN/m 3 .
• said second layer mainly consists of a vibration-
• This figure is a schematic cross section of a rail from a railway with a strip according to the invention.
• the part of the figure to the left of line I-I represents a situation in which the rail rests on the strip when it is not compressed, whereas the part of the figure to the right of line I-I represents the strip when it is compressed.
• the strip according to the invention is mainly used for laying a continuously supported track.
• These are rail systems whereby the rails rest on a support over their entire length.
• Such a continuous support may for example consists of a concrete base or of connecting sleepers placed next to one another.
• the strip 1 according to the invention has almost the same width as the foot 2 of a rail 3 and is provided between this foot 2 and the support 4 of the rail 3. Further, the rail 3 is fixed to the support 4 via the foot 2 by means of mounting clips 5 and 6 known as such.
• the strip 1 represented in the figure consists of two layers 7 and 8 situated on top of one another.
• a first layer consists of an adjusting layer 7 made of a very flexible material which, as will be further described, is considerably compressed as the rail 3 is aligned.
• the second layer forms a damping layer 8 which makes sure that vibrations of the rail 3 are damped and that the transfer of vibrations to the support 4 is strongly reduced.
• the adjusting layer 7 has what is called a static bed module which, when not compressed, is smaller than that of the damping layer 8.
• the quantity static bed module will be referred to in short by the term rigidity.
• the adjusting layer 7 is preferably selected a material with a rigidity which is at least five times smaller than the rigidity of the damping layer 8.
• the rigidity of the adjusting layer 7 amounts to for example 20 MN/m
• the rigidity of the damping layer amounts to for example 110 MN/m .
• a material is preferably selected for the adjusting layer
• the damping layer 8 having a rigidity which is preferably situated between 50 and 300 MN/m 3 , in particular between 50 and 150 MN/m 3 .
• the rail 3 When a railway is laid according to the method of the invention, the rail 3 will be aligned during or after the positioning of the latter on the strip 1. This implies that the mounting clips 5 and 6 are tightened via bolts, which are not represented in the figure, so as to firmly connect the rail 3 to the support 4, whereby, near the corresponding mounting clips 5 and 6, a specific vertical movement is imposed on the rail 3 so as to make the upper surface 9 of the rail 3 completely flat over its entire length.
• the adjusting layer 7 is compressed until its rigidity amounts to at least the same order of magnitude as that of said damping layer 8.
• the compressed layer 7 is preferably more rigid than the damping layer 8. The compression of the adjusting layer 7 makes sure that possible vertical deviations of the support 4 or of the thickness of the rails 3 are compensated for by a corresponding compression of the adjusting layer 7.
• the adjusting layer 7 is compressed to a thickness which amounts to 25 to 50%, and in particular to 30 to 40% of its original thickness.
• the strip 1 is represented in a non-compressed condition to the left of line I-I.
• the mounting clip 5 is situated in a corresponding position and is sufficiently tightened to connect the rail 3 to the support 4 in a provisional manner.
• the strip 1 is represented as compressed.
• the mounting clip 6 is hereby tightened such that the rail 3 is firmly connected to the support 4, whereas the upper surface of the rail 3 is aligned.
• the adjusting layer 7 is compressed to almost 40% of its original thickness, whereas the damping layer 8 is subjected to a relatively small compression.
• a connecting piece which is not represented in the figure is provided between the mounting clips 5 and 6 and the foot 2, forming an acoustic partition.
• This connecting piece is made for example of a cork/rubber elastomer which is internally reinforced with synthetic fibres known under the brand name "Kevlar”.
• the adjusting layer 7 consists of a microcellular rubber having a rigidity of 20 MN/m , whereas, for the damping layer 8, an elastomer known as such is used having a rigidity of 110 MN/m .
• the thiclcness of the damping layer 8 amounts for example to 12 mm, whereas that of the adjusting layer 7 in a non-compressed condition amounts to 10 mm.
• the strip according to the invention may consist for example of more than two layers lying on top of one another, which may either or not all have a different rigidity, or it may have standing edges which enclose the foot of the rail at least partially.
• the width of the strip is not necessarily equal to the width of the rails.
• the different layers of a strip according to the invention may also continuously merge into one another, such that a strip is obtained which has a varying rigidity fluctuation according to a vertical direction.
• the adjusting layer may also form the top layer of a strip.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Railway Tracks (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
• Coupling Device And Connection With Printed Circuit (AREA)
• Magnetic Heads (AREA)
• Threshing Machine Elements (AREA)
• Vibration Prevention Devices (AREA)
• Road Paving Structures (AREA)
• Machines For Laying And Maintaining Railways (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3896546

Family Applications (1)

Country Status (8)

Cited By (3)

Citations (5)

Family Cites Families (3)

• 2000
  • 2000-05-25 BE BE2000/0351A patent/BE1013537A3/nl not_active IP Right Cessation
• 2001
  • 2001-05-25 WO PCT/BE2001/000092 patent/WO2001090483A1/en active IP Right Grant
  • 2001-05-25 EP EP01935838A patent/EP1283923B1/de not_active Expired - Lifetime
  • 2001-05-25 PT PT01935838T patent/PT1283923E/pt unknown
  • 2001-05-25 AU AU2001261930A patent/AU2001261930A1/en not_active Abandoned
  • 2001-05-25 AT AT01935838T patent/ATE279580T1/de not_active IP Right Cessation
  • 2001-05-25 ES ES01935838T patent/ES2228865T3/es not_active Expired - Lifetime
  • 2001-05-25 DE DE60106426T patent/DE60106426T2/de not_active Expired - Fee Related

Patent Citations (5)

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