EP1149950A1 - Structure porteuse pour voie ferrée - Google Patents

Structure porteuse pour voie ferrée Download PDF

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Publication number
EP1149950A1
EP1149950A1 EP01109706A EP01109706A EP1149950A1 EP 1149950 A1 EP1149950 A1 EP 1149950A1 EP 01109706 A EP01109706 A EP 01109706A EP 01109706 A EP01109706 A EP 01109706A EP 1149950 A1 EP1149950 A1 EP 1149950A1
Authority
EP
European Patent Office
Prior art keywords
ballast
load bearing
coagulant
bearing structure
track
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.)
Withdrawn
Application number
EP01109706A
Other languages
German (de)
English (en)
Inventor
Barry Puckey
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.)
Alstom Transportation Germany GmbH
Original Assignee
Bombardier Transportation GmbH
DaimlerChrysler Rail Systems GmbH
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
Priority claimed from GB0010260A external-priority patent/GB0010260D0/en
Application filed by Bombardier Transportation GmbH, DaimlerChrysler Rail Systems GmbH filed Critical Bombardier Transportation GmbH
Publication of EP1149950A1 publication Critical patent/EP1149950A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2/00—General structure of permanent way
    • E01B2/003—Arrangement of tracks on bridges or in tunnels
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
    • E01B1/001—Track with ballast
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers

Definitions

  • the invention relates to a load bearing structure for railways comprising ballast and a coagulant for binding the ballast to form a cohesive mass.
  • rail systems typically comprise a track supported on a ballast bed together with various trackside equipment such as signals, location boxes, trackside buildings and the like.
  • various trackside equipment such as signals, location boxes, trackside buildings and the like.
  • various communication cables will run buried underground adjacent to the tracks.
  • CAT scan is required to see if there is a cable present which might be damaged.
  • the industry standard requires that a fresh CAT scan be made every 15cm of depth, so that several separate scans are required at each location.
  • the present invention seeks to provide a load bearing structure and a method for making this, which is quicker and cheaper to install than the presently used methods.
  • a load bearing structure for railways comprising ballast and a coagulant adapted to bind the ballast, wherein the coagulant is an elastomeric dispersion, which dispersion is added to the ballast in situ, such that the ballast and coagulant form a cohesive mass.
  • the coagulant is added to ballast adjacent to a railway track. In an alternative embodiment, the coagulant is added to the ballast in the region of a set of points.
  • the cohesive mass preferably has a load bearing capacity of 0.5 tons per square foot or more.
  • the coagulant is a polyurethane foam.
  • the invention provides the advantage over the known solutions that it is quick and easy to install as the coagulant can cure typically in less than 30 minutes.
  • the ballast can be poured over the existing trackside, if it is not already present, the need to dig foundations and hence carry out CAT scans is obviated.
  • Figure 1 shows a pair of rails 1,2 supported on a sleeper 2 on a ballast bed 3. Adjacent to the track at a typical distance of 2 m are a plurality of handrails separating the trackside equipment from the rails. Adjacent to the rails on the side remote from the track is shown by way of example some cable routing 4, location case 5 on a firm standage 6 and a signal 7. In general the standage will be made from a combination of pre-cast concrete and site poured concrete as outlined above.
  • FIG 2a and 2b show a schematic longitudinal cross-section through a track bed for a jointed rail and a continuous rail respective.
  • the standard ballast 10 arrangement for each type of bed is shown in solid profile.
  • additional ballast 11 is the spread adjacent to the conventional ballast 10, which is protected by shutters 12 and 13.
  • this is shown as having a level which is substantially parallel to the conventional track bed, whereas in figure 2b, it is slightly below the raised edge of the ballast.
  • the amount of additional ballast used is dependent on the requirements of the trackside equipment to be supported but in general no excavations will be necessary.
  • a coagulant such as polyurethane foam
  • polyurethane foam is then poured over the additional ballast 11 in the area to form the load bearing structure.
  • polyurethane foam is then poured over the additional ballast 11 in the area to form the load bearing structure.
  • about 25kg of polyurethane is poured over an area of 4 square feet, to a depth of 2 feet such as would used to support a signal.
  • the polyurethane has a curing time of about one hour, so that the signal can be installed shortly after the load bearing structure has been prepared and formed.
  • any coagulating foam which when combined with the ballast achieves a load bearing capacity of in the region of 1 ⁇ 2 ton per square foot would be suitable.
  • Figure 3 shows a particularly preferred embodiment of the load bearing structure for supporting a signal in which first and second cantilevers 20, 21 are fixed to sleepers 22,23.
  • the first and second cantilevers 20, 21 meet a point remote from the original track bed.
  • the space between and around the cantilevers is covered with additional ballast and then coagulant is poured over the additional ballast to form the load bearing structure.
  • the signal is then installed at the point where the cantilevers meet.
  • a single cantilever extending parallel from a sleeper could be used. This particular embodiment has the additional advantage that the track will be stabilised by the load bearing structure.
  • Figure 4 shows a schematic plan view of a set of points 30 on a bed of ballast.
  • a particular problem with points on curved section of track is that the momentum of the train will tend to try to bend the track straight leading to slight warping of the rails. Over time this leads to a points failure as the points are gradually shifted out of position with respect to the other rails.
  • Coagulant foam is poured over the ballast in the region of points and allowed to cure. Due to the elasticity provided by the elastomeric polyurethane coagulant, the track will be stabilised and the load bearing structure will provide a damping effect on vibrations and any rail movements. To minimise the drainage problems that the coagulant will cause, a small channel can be left in the centre of the ballast bed so that water can drain away.
  • Suitable polyurethane foams include foams formed from a mixture of polyether polyols and polyether/polyester polyols using amine catalysts, such as those sold under the Eviromould and Envirofoam trade marks.
  • Other possible foams include diphenylmethane diisocyanate based foams.
  • the structure has been described as suitable for providing support for railway trackside equipment, it is envisaged that the structure could also be used for certain conventional building foundations.
  • the structure can act as a vibration dampener for certain bridge and gantry foundation systems, in particular for metal beam type structures.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
EP01109706A 2000-04-27 2001-04-19 Structure porteuse pour voie ferrée Withdrawn EP1149950A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0010260A GB0010260D0 (en) 2000-04-27 2000-04-27 Load bearing structure for a railway
GB0010260 2000-04-27
GB0020078 2000-08-15
GB0020078A GB2361731A (en) 2000-04-27 2000-08-15 Load bearing structure

Publications (1)

Publication Number Publication Date
EP1149950A1 true EP1149950A1 (fr) 2001-10-31

Family

ID=26244179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01109706A Withdrawn EP1149950A1 (fr) 2000-04-27 2001-04-19 Structure porteuse pour voie ferrée

Country Status (1)

Country Link
EP (1) EP1149950A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7896255B2 (en) * 2007-01-18 2011-03-01 Msb-Management Gmbh Partly foamed railroad track support arrangement
WO2020109267A1 (fr) * 2018-11-27 2020-06-04 Covestro Deutschland Ag Procédé de préparation d'un lit de voie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2063727A1 (de) * 1970-12-24 1972-08-24 Michelfelder, Gerhard, 8000 München Verfahren zur Stabilisierung eines Schotterbettes
FR2553445A1 (fr) * 1983-10-14 1985-04-19 Wellington Bv Procede pour l'obtention d'un ballast supportant une voie ferree et ballast ainsi obtenu
JPH0754301A (ja) * 1993-08-11 1995-02-28 Inoac Corp 軌道の道床砕石飛散防止方法
DE19755602A1 (de) * 1996-12-18 1998-06-25 Heitkamp Gmbh Bau Oberbau für Eisenbahngleise
EP0969148A1 (fr) * 1995-10-10 2000-01-05 Harald Müller Barrière de sécurité de chemin de fer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2063727A1 (de) * 1970-12-24 1972-08-24 Michelfelder, Gerhard, 8000 München Verfahren zur Stabilisierung eines Schotterbettes
FR2553445A1 (fr) * 1983-10-14 1985-04-19 Wellington Bv Procede pour l'obtention d'un ballast supportant une voie ferree et ballast ainsi obtenu
JPH0754301A (ja) * 1993-08-11 1995-02-28 Inoac Corp 軌道の道床砕石飛散防止方法
EP0969148A1 (fr) * 1995-10-10 2000-01-05 Harald Müller Barrière de sécurité de chemin de fer
DE19755602A1 (de) * 1996-12-18 1998-06-25 Heitkamp Gmbh Bau Oberbau für Eisenbahngleise

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7896255B2 (en) * 2007-01-18 2011-03-01 Msb-Management Gmbh Partly foamed railroad track support arrangement
WO2020109267A1 (fr) * 2018-11-27 2020-06-04 Covestro Deutschland Ag Procédé de préparation d'un lit de voie

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