Coating processes – Removable protective coating applied
Patent
1995-03-06
1997-08-12
Bareford, Katherine A.
Coating processes
Removable protective coating applied
427136, 427420, B05D 700
Patent
active
056563272
DESCRIPTION:
BRIEF SUMMARY
This Application is a National Stage application of PCT/EP93/01088, filed May 5, 1993.
BACKGROUND AND OBJECT OF THE INVENTION
Object of the present invention is a process for the temporary consolidation of railroad track ballast, or a bed of broken stones in particular during the time of redevelopment or reconstruction of a parallel set of tracks. Up to the present such a temporary consolidation of railroad track ballast was performed by pile driving S-shaped iron boards near the track or by driving in iron cribs with pointed side anchorages. Without such temporary consolidations the ballast would swim away due to the shocks of railroad traffic on the one side as well as due to the vibrations and shocks near to the ballast during redevelopment or reconstruction of a parallel set of tracks on the other side and thereby endanger stability and adjustment of the railroad track.
Pile driving of the S-shaped iron boards as well as driving in the iron cribs with anchorages is connected with a serious noise pollution hardly endurable in particular near by resedential districts. Therefore the object of the invention is to provide a process for the temporary consolidation of railroad tracks being achievable in a simple, safe and noiseless way.
SUMMARY OF THE INVENTION
This object may be solved in a surprisingly simple way by partially cementing the ballast, especially in the side area, with a multi component adhesive, whereby this cementation may be broken up later mechanically without affecting reuse of the ballast. The latter is important above all because often, after having reconstructed or redeveloped the one railroad track, the railroad traffic subsequently is directed over this one and subsequently the track used before is to be reconstructed or redeveloped. On this occasion the ballast material always should be reused. Therefore the cementation should not be so intensive such that it cannot be broken up again.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The multi component adhesive preferably is applied by feeding the components of the adhesive separated physically from each other under a pressure from 30 to 200 bar to a mixing chamber, mixing them in the mixing chamber turbulently with each other and applying laminarly the mixture under a pressure from 2 to 6 bar by means of a flat curtain-like film on the ballast. This process prevents a premature breaking of the film and the formulation of drizzles. Moreover, this process allows one to work avoid solvents. This process ensures in addition that the ballast material initially is wetted completely and that adhesive bridges are formed at the contact points. On no account the voids should be felled as this would make rebreaking and reuse of the ballast material impossible.
The process for applying appropriate multi component adhesives as well as a device suited for this is, for example, described in the applicants WO 91/08056. Specifically, as described in WO 91/08056, preferred multi-component adhesives include epoxide resin adhesives as well as polyurethane resin adhesives. An appropriate epoxide resin adhesive, for instance, may consist of a resin component and a hardener component. The resin component may consist of nonbrominated bisphenol A resins and cycloaliphatic resins. Added thereto may be monofunctional and/or bifunctional reactive thinners, phosphoric esters as flame retardants, silicic acid esters as primers, and a silicone defoamer. The hardener component may consist of adducts of amines, amides, phenol-free Mannich bases or mixtures thereof, benzyl alcohol as a promoter, silicic acid ester as a primer, and silicone defoamer. A thin curtain of these multi-component adhesives may be laminarly applied to the ballast by means of a fan spray nozzle.
To perform the process according to the invention at least at the side area of the ballast so much multi component adhesive is applied that an anchorage up to the subsoil takes place. In case of a subsequent rebreaking of the ballast for the purpose of redevelopment or reconstruction of this
REFERENCES:
patent: 5372844 (1994-12-01), Ihle et al.
Railway Engineer International, vol. 5 (1980) Jan., "Can Ballast be Stabilised by Glueing" pp. 51-54.
Bareford Katherine A.
Koch Marmorit GmbH (DE/DE)
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