Portable tubular structure for e.g. tunnels of passenger/freight trains, has outer layer joined to intermediate layer, where outer layer is formed by sheet of same material as sheet of inner layer

Abstract

The structure has an inner layer (IN) formed by a sheet (1). A free surface of the inner layer forms a hole when the structure is in an extended position. An intermediate layer (I) is attached to the inner layer, where intermediate layer is a bag (3) for accommodating a filling material. An outer layer (E) is joined to the intermediate layer. The outer layer is formed by a sheet of the same material as the sheet of the inner layer. The inner layer is formed by the sheet of a material selected from FRP and FML. USE - Portable tubular structure for tunnels and shafts of passenger/freight trains or wind turbines. ADVANTAGE - The structure eliminates costly fixed installations such as pultruders, so as to mount the structure in workshops with reduced installations and to transport the structure to remote places. The structure reduces the use of metallic materials, thus reducing the footprint of carbon and exploitation of mines, reducing use of coal and reducing costs of electrical energy systems to refine steel. The structure facilitates transport of the structure through modulation, so that light transport vehicles can be used with easy access to any area. The structure achieves durability and longevity of the infrastructure with little maintenance. The structure is easy to assembly on site. The structure reduces fuel consumption for transport. The structure allows units of pipe to can be transported in a single lorry. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for manufacturing a portable tubular structure. DESCRIPTION Of DRAWING(S) - The drawing shows a schematic view of a tubular structure.EOuter layerIIntermediate layerINInner layer1Sheet3Bag