| 摘要 |
PURPOSE: A perforated pipe having improved supporting force is provided to prevent the deformation of a pipe by the earth pressure. CONSTITUTION: A holding protrusion(10a-2) is installed on a holding piece(10a-1). A first plate body(1a) includes reinforcing support protrusions with the constant interval. A second plate body(1b) includes a holding hole. The second plate body includes the reinforcing support protrusions with the constant interval. A connection part(11) integrates the first and second plate bodies.
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