초록 ▼

Axially extending structures having internal forces directed radially outward therefrom may be reinforced by installing bands around the structures. The bands consist of a plurality of elastic convolutions of a composite material which assume a coiled configuration in a relaxed condition. The compos

Axially extending structures having internal forces directed radially outward therefrom may be reinforced by installing bands around the structures. The bands consist of a plurality of elastic convolutions of a composite material which assume a coiled configuration in a relaxed condition. The composite material includes a multiplicity of continuous, high tensile strength filaments encapsulated in a resin matrix and extending codirectionally with one another through the resin matrix. The band is installed around the structure by deflecting portions of the band to an uncoiled configuration and then wrapping these portions of the band around the structure. Adhesive may be used to secure the band tightly around the structure. Particularly useful applications for the composite bands are for reinforcing gas and liquid transmission pipelines and concrete bridge support columns.

대표청구항 ▼

A method of reinforcing an axially extending structure against an internal force directed radially outward from said structure, said method comprising the steps of: providing a spiral band having a plurality of convolutions of a high tensile strength composite material, each one of said convolutions

A method of reinforcing an axially extending structure against an internal force directed radially outward from said structure, said method comprising the steps of: providing a spiral band having a plurality of convolutions of a high tensile strength composite material, each one of said convolutions having at least one surface that is substantially flat in transverse cross-section, said composite material including a multiplicity of continuous, high tensile strength filaments substantially completely encapsulated in a resin matrix and not interconnected by cross-threads, said filaments extending codirectionally with one another through said resin matrix, wrapping said plurality of convolutions of said spiral band about said structure, simultaneous with said wrapping step, applying a layer of an adhesive between adjacent ones of said plurality of convolutions.