A system for structurally reinforcing lengths of a duct conduit, the system comprising primarily metal bolts, and a pair of metal friction-fit threaded inserts for the ends of an internal reinforcing tube or pipe, which tube or pipe extends across the interior of the conduit

'across':42 'bolt':16 'compris':13 'conduit':10,47 'duct':9 'end':29 'extend':41 'fit':24 'friction':23 'friction-fit':22 'insert':26 'interior':44 'intern':32 'length':6 'metal':15,21 'pair':19 'pipe':36,40 'primarili':14 'reinforc':5,33 'structur':4 'system':2,12 'thread':25 'tube':34,38

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