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US 3,945,782 AGranted
Concrete pipes
AssigneeAmey Roadstone Corporation Limited
InventorRobert M. Farahar
Life of this patent
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AssigneeAmey Roadstone Corporation Limited
InventorRobert M. Farahar
Estimating the term…
A pipe of concrete, cement mortar or other cementitious material is formed by an integrally cast cementitious mass which is reinforced with a glass fibre strand or roving forming a substantially helical winding extending around the pipe and incorporated in the cement matrix of the cementitious mass. Preferably there are two windings, one incorporated in the outer periphery of the mass and the other incorporated in the inner periphery of the mass. The pipe is preferably made by a centrifugal casting operation in which a centrifugal casting mould is rotated and the glass fibre strand or roving is fed from a feeding device within the mould and is caused to adhere to the internal peripheral face of the mould and then the feeding device is moved axially along the mould as the mould rotates so that the winding is formed from the roving around the internal peripheral face of the mould. The concrete or other cementitious material is introduced into the mould at the same time as the glass fibre roving or subsequently and the winding becomes incorporated in the cement matrix of the cementitious material as the mould continues to be rotated.
Apparatus for making a pipe comprising a body formed by an integrally cast mass of cementitious material including a cement matrix and a glass fibre roving reinforcing said body, said roving forming a winding extending around said body along the length thereof, said roving being incorporated in said cement matrix, said apparatus comprising a centrifugal pipe mould, means for rotating said mould, means for feeding a glass fibre roving to the inside of said mould in a position in which said roving impinges on an internal peripheral face of said mould and means for moving said feeding device axially within said mould.
Apparatus for making a tubular body comprising an integrally and centrifugally cast mass of cementitious material including a matrix of inorganic cement and glass fibre strand or roving reinforcing said mass and forming a winding which extends around said body and is incorporated and bonded in said matrix, said apparatus comprising centrifugal mold means, a driving mechanism, means operatively connecting said driving mechanism to said mold means for spinning said mold means, a feeding device including means for impregnating a glass fibre strand or roving with cementitious slurry and means for positively feeding said glass fibre strand or roving after impregnation to the inside of said mold means at a speed at least as great as the internal peripheral speed of said mold means as said mold means is spun by said driving means, said strand or roving being fed by said feeding device in a position in which said strand or roving impinges on said internal peripheral face of said mold means, and means for moving said feeding device within said mold means in a direction parallel to an axis about which said mold means is spun.
Dependencies are inferred from the claim text.