WO2005012641A1 - Amortisseur de rail - Google Patents

Amortisseur de rail Download PDF

Info

Publication number
WO2005012641A1
WO2005012641A1 PCT/GB2004/003294 GB2004003294W WO2005012641A1 WO 2005012641 A1 WO2005012641 A1 WO 2005012641A1 GB 2004003294 W GB2004003294 W GB 2004003294W WO 2005012641 A1 WO2005012641 A1 WO 2005012641A1
Authority
WO
WIPO (PCT)
Prior art keywords
rail
encapsulation
damper according
block
clip
Prior art date
Application number
PCT/GB2004/003294
Other languages
English (en)
Inventor
David Farrington
Les Hodgson
Paul Kitson
Original Assignee
Corus Uk Limited
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 Corus Uk Limited filed Critical Corus Uk Limited
Publication of WO2005012641A1 publication Critical patent/WO2005012641A1/fr

Links

Classifications

    • 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 present invention relates to improvements in or relating to damping of rail tracks. It addresses the problem of attaching damping devices to the rail and seeks to improve upon existing methods of doing so.
  • the present invention provides a rail damper comprising at least one tuned absorber element held in a block of resilient material, in which at least part of the block is held within a rigid encapsulation, the encapsulation being adapted to be held against a rail surface.
  • the encapsulation prefferably in the form of a tubular member in which the block is provided.
  • This tubular member can have one or more closed ends. Where one end is open, the block can project into the encapsulation via that end or can be contained entirely within the encapsulation.
  • a particularly convenient arrangement is for the encapsulation to consist of two such tubular members, with each end of the block projecting into one such member.
  • the encapsulation can be provided with engagement sites for a clip such as the clip shown in our earlier application GB0316521.4 or other suitable clips.
  • a clip such as the clip shown in our earlier application GB0316521.4 or other suitable clips.
  • the clip is arranged to urge the two said members apart. It is preferred that the clip is in frictional contact with the rail as this will enable the assembly to slide along the rail if it should move longitudinally, for example following a breakage.
  • Such engagement sites can include recesses in the encapsulation which accept free ends of the clip. These recesses can extend into the encapsulation only, or can be deeper allowing the clip to contact the block and/or the absorber elements.
  • the block and the encapsulation can be made to engage by various means. Examples include casting the block within the encapsulation as a mould, or forming suitable shapes in internal faces of the encapsulation such as dovetails etc. BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 is a side view of an arrangement according to the present invention.
  • Figure 2 shows the effect on the arrangement of figure 1 of a small longitudinal movement of the rail
  • FIGS 3 and 4 show the effect of greater movement
  • Figure 5 shows a cross section through the damper
  • Figure 6 shows the interface between the encapsulation and the rail
  • Figure 7 shows an alternative clip in place around the damper
  • Figure 8 shows a section through a modified damper with inter- engagement between the block and the encapsulation.
  • Figure 1 shows a rail 10 damped according to the present invention.
  • An elongate damper 200 is disposed in the corner between the web of the rail 10 and its foot, and (in brief) comprises a block of resilient material in which is suspended one or more resonant members as set out in WO99/15732. It will be observed from W099/15732 that multiple resonant members are strongly preferred over single resonant members due to their ability to absorb a wider range of resonant frequencies.
  • GB0316521.4 described a clip 202 (shown in figure 1) to allow easy installation and removal of the damper.
  • the present invention allows clipped systems such as those in GB0316521.4 to cope with longitudinal movement of the rail.
  • Rails move longitudinally when, for example, there is a break at some point. The residual longitudinal stresses in the rail then pull the rail apart at the break point and this results in a length of rail either side sliding through the rail fastenings.
  • the damper shown in figure 1 is fitted with end caps 204, 206. These each encapsulate one end of the damper and are formed of a suitable rigid material such as plastics. Each end cap is formed with a respective recess 208, 210 into which the end of the clip 202 can fit, and with a downwardly extending abutment shoulder 212, 214 for reasons that will be explained below.
  • Figure 2 shows the effect of moving the rail slightly.
  • the damper is attached to the rail via the damper and will therefore move with the rail. So long as the movement of the rail is insufficient to bring the damper (etc) into contact with the sleeper 216 or other structures such as the rail fastening 218 then there will be no effect.
  • Figure 3 shows the effect of still more movement.
  • the abutment shoulder 214 has now been pushed against the sleeper 216 and transmits a longitudinal force 220 to the encapsulation 206. If the shoulder 214 were omitted then the same force could be transmitted by impact between the encapsulation 206 and the rail fastening 218, but contact with the sleeper is likely to be more controllable.
  • the net effect is therefore to reduce the strength of the compression of the damper onto the rail and to allow the damper to slide therealong away from the sleeper 216. Movement of the rail is not therefore problematic.
  • a direct benefit of this arrangement is that the damper can be designed to occupy a greater proportion of the inter-sleeper gap since there need be no allowance for rail movement. This allows a greater damping effect since a greater proportion of the rail length can be damped. Use of this system can improve the damping effect by several decibels.
  • Figure 5 shows a section through the rail damper 200.
  • a resilient material 222 holds a plurality of resonant dampers 224a-224d.
  • the encapsulating end cap 206 forms a mould in which the resilient material is formed and has suitably shaped external faces 226 to fit the exterior of the rail.
  • An aperture 210 is formed as described above, to accept one end of the clip 202.
  • the end of the clip 202 extends through the end cap 206, through the resilient material 222, and into a suitably shaped recess in the resonant member 224d. This depth of engagement allows a good resistance to removal of the clip 202 during movement of the damper along the rail and hinders vandalism of the damper.
  • Figure 6 shows the interface between the rail 10 and the end cap 204, 206.
  • a plurality of horizontal grooves 228, 230 etc are formed to accept conformal materials such as epoxy resin. On fitting the damper, these take up the exact shape of the rail and provide a good acoustic conductor between the rail and damper.
  • the rail surface can be provided with a grease or release agent to prevent bonding if desired.
  • the groves need not be especially deep, and shallow depths such as 2mm should suffice.
  • Figure 6 shows the grooves on the face facing the web section of the rail. It is also possible to place these on the face facing the foot of the rail, in addition to or as an alternative to those facing the web. When provided in addition, such further grooves can assist further with the acoustical contact between the rail and the damper.
  • Figure 7 shows an alternative clip 232.
  • This attaches to the side of the damper 200 and has ends which extend into a horizontal recess therein. It then descends to beneath the rail, traverses the underside, and extends upwards to a corresponding recess on a damper fitted to the other side of the rail.
  • the clip 232 will tilt and its tension will have a horizontal component, thereby allowing the damper to be moved along the rail.
  • Figure 8 shows a modified form of damper.
  • the encapsulation 206 around the block of resilient material 200 is formed with a male dovetail 234 extending into the area occupied by the resilient material 200.
  • the resilient material 200 is formed in place around the dovetail 234 or formed with a corresponding female dovetail and fitted in place. With this arrangement, or with other means for securing the resilient material 200 to the encapsulation 206, the encapsulation 206 need not completely surround the resilient material 200.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

L'invention concerne un amortisseur de rail qui comprend au moins un élément amortisseur de vibrations dynamique maintenu dans un bloc de matière élastique ; au moins une partie du bloc est maintenue dans un système d'encapsulation rigide, ce système étant conçu pour être maintenu contre une surface du rail. Le système d'encapsulation peut comporter des régions destinées à entrer en contact avec un élément de serrage.
PCT/GB2004/003294 2003-07-29 2004-07-29 Amortisseur de rail WO2005012641A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0317721A GB2404942A (en) 2003-07-29 2003-07-29 Damping of rail tracks
GB0317721.9 2003-07-29

Publications (1)

Publication Number Publication Date
WO2005012641A1 true WO2005012641A1 (fr) 2005-02-10

Family

ID=27799401

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/003294 WO2005012641A1 (fr) 2003-07-29 2004-07-29 Amortisseur de rail

Country Status (2)

Country Link
GB (1) GB2404942A (fr)
WO (1) WO2005012641A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439834A (en) * 2006-07-03 2008-01-09 Corus Uk Ltd Clip for a rail damper
EP2314768A1 (fr) * 2009-10-22 2011-04-27 Vossloh Werke GmbH Amortissement d'âmes de rail pour la réduction du son sur des rails de voie ferrée
CN113174787A (zh) * 2021-04-28 2021-07-27 香港理工大学深圳研究院 一种基于模块化钢轨颗粒阻尼器的轨道交通减振降噪方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB316521A (en) 1928-07-28 1930-09-04 British Celanese Improvements in the treatment of materials containing cellulose esters
WO1993016230A1 (fr) * 1992-02-13 1993-08-19 Acappella Enterprises Ltd. Systemes de suppression du bruit
EP0761879A1 (fr) * 1995-09-06 1997-03-12 Hutchinson Absorbeur de bruit pour rails d'une voie ferrée
WO1999015732A1 (fr) 1997-09-19 1999-04-01 British Steel Limited Accessoires de rail

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2399124B (en) * 2003-03-05 2006-07-26 Corus Uk Ltd Rail damper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB316521A (en) 1928-07-28 1930-09-04 British Celanese Improvements in the treatment of materials containing cellulose esters
WO1993016230A1 (fr) * 1992-02-13 1993-08-19 Acappella Enterprises Ltd. Systemes de suppression du bruit
EP0761879A1 (fr) * 1995-09-06 1997-03-12 Hutchinson Absorbeur de bruit pour rails d'une voie ferrée
WO1999015732A1 (fr) 1997-09-19 1999-04-01 British Steel Limited Accessoires de rail

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439834A (en) * 2006-07-03 2008-01-09 Corus Uk Ltd Clip for a rail damper
EP1876295A3 (fr) * 2006-07-03 2008-05-21 Corus UK LTD. Amortisseurs de rails
EP2314768A1 (fr) * 2009-10-22 2011-04-27 Vossloh Werke GmbH Amortissement d'âmes de rail pour la réduction du son sur des rails de voie ferrée
WO2011048209A1 (fr) * 2009-10-22 2011-04-28 Vossloh Werke Gmbh Amortissement de l'âme de rail pour la réduction du bruit des voies ferrées
CN102725449A (zh) * 2009-10-22 2012-10-10 福斯洛工厂有限责任公司 用于铁路轨道处的噪声降低的轨腰缓冲部
US8763924B2 (en) 2009-10-22 2014-07-01 Vossloh Werke Gmbh Rail web damping to reduce sound on rail lines
CN113174787A (zh) * 2021-04-28 2021-07-27 香港理工大学深圳研究院 一种基于模块化钢轨颗粒阻尼器的轨道交通减振降噪方法

Also Published As

Publication number Publication date
GB2404942A (en) 2005-02-16
GB0317721D0 (en) 2003-09-03

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