| 摘要 |
PURPOSE: A complex pipe with high rigidity is provided to reduce the variation of inner and outer cooling speed and prevent the torsion of the pipe by cooling a filling member first or simultaneously. CONSTITUTION: In a complex pipe(1) with high rigidity, a filling member(2) is inserted into an inner space(10) of a beam composed of an inner wall(11) and outer wall(12). The filling member(2) is mixed with stone, glass fiber, ceramic fiber, polymer, or metallic material to promote cooling and improve specific gravity.
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