초록 ▼

A pipe section for concrete includes an end coupler interconnecting to another pipe section in a flow line. The coupler has an outer clamp secured extended from the pipe end with a coupling groove. An encircling clamp has sides located in the grooves of adjacent pipe sections to lock the pipe sectio

A pipe section for concrete includes an end coupler interconnecting to another pipe section in a flow line. The coupler has an outer clamp secured extended from the pipe end with a coupling groove. An encircling clamp has sides located in the grooves of adjacent pipe sections to lock the pipe section together. The body and pipe end form an inner recess extending from the pipe end. An insert liner has a tubular portion matching the recess, with the outer surface of the tubular portion tapered to form a gap within the recess. The insert liner has an outer flange matching the outer diameter of the body and abuts the body. The inner wall of the liner has a central transition point from which the wall tapers inwardly in opposite directions to the outer end. The body member is formed of a high strength ductile steel. The insert liner is formed of a wear resistant material having a Rockwell hardness of 80 to 90. A carbide alloy consisting essentially of carbides, martensite, bainite and austenite, and 12-15% chromium, 2-3% carbon and traces nickel, molybdenum and austenite. A toughened ceramic is disclosed. The liner is adhesively bonded to the body using an epoxy adhesive which is responsive to heat for release of the liner. The liner is inserted by applying adhesive on the tubular portion and then pushing the liner into the recess.

대표청구항 ▼

1. A pipe unit for releasable connection of one pipe member to a second pipe member in a concrete pumping line for carrying concrete, comprising:a steel pipe member having a hardened inner wall for carrying concrete, an outer body member secured to one end of said one pipe member and having an exter

1. A pipe unit for releasable connection of one pipe member to a second pipe member in a concrete pumping line for carrying concrete, comprising:a steel pipe member having a hardened inner wall for carrying concrete, an outer body member secured to one end of said one pipe member and having an external circumferential coupling groove for receiving a coupler unit for interconnection of said one pipe member to said second pipe member, said body member and said one pipe member defining an inner recess extended outwardly of the pipe member, an insert liner having a tubular portion located within said substantially matching said inner recess, said insert liner having an outer locating and abrasive resistant end flange abutting the end of said body member, and an epoxy adhesive between said tubular portion and said recess and bonding said liner to said body member, said epoxy adhesive releasing said liner in response to heating said epoxy adhesive, said inert liner being a cast member of a wear resistance iron chrome alloy and providing a surface highly resistant to the abrasive force of concrete.