| 摘要 |
PURPOSE:To contrive of show corrosion resisting effect by the corrosion resisting coat made in manufacturing process even at the splash zone of the ocean and the zone of ebb and flow of the tide by molding polyolefin corrosion resisting coat on at least one surface of a steel sheet pile, while pressure-welding resin sheet onto the steel sheet pile. CONSTITUTION:The steel sheet pipe 1 avancing in longitudinal direction undergoes rust removing operation and under ground treatment at a preliminarily treating zone 3, and is preheted at the temperature equal to the crystallizing temperature of denatured polyolefin family adhesive resin or higher and equal to 250 deg.C or lower at the preheating zone 4 o the steel sheet pile. Denatured polyolefin family adhesive resin and polyolefin resin are supplied to two extruders 5 and are molten at a melting zone. Next, said resins are extruded from T type die 6 on the steel sheet pile like a sheet, and the molten molded sheet 7 of each resin is obtained. When two sheets are placed on the steel sheet pile, the molded sheet of adhesive resin is first caused to be in contact with the sheet pile, and to become an inner layer. The surface of coated side is pressed by a press welding roller 8. After the molten molding sheet 7 has been pressure welded to the steel sheet pile, it is cooled. Thus, as at least one surface is corrosion resisting-coated with the thick film of olefin resin in manufacturing process, even at the splash zone in ocean and the ebb and flow zone of the tide, the corrosion resistance may be kept. |
