FOAMING SHEET FOR CONNECTING UNDERGROUND PIPES

摘要

PURPOSE: A foam sheet for connection of underground buried pipes is provided to reduce the output voltage generated in a single process of fusion, thereby reducing the capacities of a rectifier and a generator. CONSTITUTION: A foam sheet for connection of underground buried pipes, which is fused on joined ends of two pipe being connected, comprises first and second sheets and an electric heating wire sheet(220) which is arranged between the laminated first and second sheets. In the electric heating wire sheet, coated electric heating wires(210) are arranged in a row. The foam sheet is divided by half in the longitudinal direction into a first fused part(A-A1) and a second fused part(B-B1).