Geoengineering constructions for use in railways
AssigneeTensar Technologies Limited
InventorMike Horton
Life of this patent
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Abstract
There is disclosed a railway geogrid construction suitable for use with high speed trains to mitigate the increased impact of Rayleigh waves generated at high speed and/or over soft subgrades, the construction comprising: a track bed (e.g. having rails for a train) which defines a track located on a track plane; a mass of particulate material (e.g. aggregate) forming a layer located beneath the track plane; and a geogrid located in and/or below the particulate mass in a plane (geogrid plane) substantially parallel to the track plane where the average distance between the track plane and geogrid plane, measured perpendicular to both is greater than 0.65 metres.
Claims30
1-28. (canceled)
A geogrid engineering construction for railways (railway geogrid construction), the construction comprising:
- a track bed (optionally the track bed comprising rails) which defines a track located on a track plane;
- a mass of particulate material forming a layer located beneath the track plane;
- and
- at least one geogrid located in and/or below the particulate layer, where the at least one geogrid is located in a plane (geogrid plane) substantially parallel to the track plane where the average distance between the track plane and geogrid plane, measured perpendicular to both planes, and denoted herein as Dr, is greater than 0.65 metres.
A method for constructing a geogrid engineering construction for railways (railway geogrid construction), optionally the railway geogrid construction as claimed in any preceding claim, the method comprising the steps of:
- providing a track bed (optionally the track bed comprising rails) which defines a track located on a track plane;
- providing a particulate layer lying beneath the track plane with a geogrid located in and/or adjacent to the particulate layer,
- where the geogrid is located in a plane (geogrid plane) substantially parallel to the track plane where the average distance between the track plane and geogrid plane, measured perpendicular to both, and denoted herein as Dr, is greater than 0.65 metres.
Use of a geogrid and/or component thereof to increase the speed of the Rayleigh wave therein (Vr) and/or increase the critical track velocity along rails of a track laid thereon (Vc) above a maximum allowed train velocity denoted Vt, where Vt is at least 55 ms−1, preferably ≥69 ms−1.
Dependencies are inferred from the claim text.