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公开(公告)号:US3517424A
公开(公告)日:1970-06-30
申请号:US3517424D
申请日:1967-06-09
申请人: MARTIN MARIETTA CORP
IPC分类号: B28B21/12
CPC分类号: B28B21/12
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公开(公告)号:US3683061A
公开(公告)日:1972-08-08
申请号:US3683061D
申请日:1969-10-09
申请人: MARTIN MARIETTA CORP
发明人: GATES ROBERT H
CPC分类号: F16L25/0027 , B28B21/76 , F16L9/08
摘要: Non-metallic, disposable rings are employed in the forming of a groove in the spigot portion of concrete pipe sections. This disposable ring is attached to either the header or the pallet section of a pipe-making form in proper position to form the desired groove in the spigot portion of the concrete pipe section during the making of the concrete pipe section. The ring is made of any rigid, non-metallic disposable material capable of resisting heat, water, alkali and steam. The disposable ring may be left in place when the header and pallet sections of the form are removed from the partially cured pipe. The ring may be removed from the pipe section some time after the pipe section has properly cured, preferably at the time the pipe section is to be used. The possibility of damage to the groove may thus be reduced or eliminated, and the groove may be kept free of dirt and other foreign matter until the pipe section is actually employed during the installation of a line of concrete pipe.
摘要翻译: 非金属,一次性环用于在混凝土管段的插口部分中形成槽。 该一次性环在制管形成部件的集管或托板部分的适当位置附接,以在混凝土管段制造期间在混凝土管段的插口部分中形成所需的槽。 该环由能够抵抗热,水,碱和蒸汽的任何刚性,非金属的一次性材料制成。 当形状的集管和托板部分从部分固化的管中移除时,一次性环可以留在原处。 在管段已经适当固化之后,优选地在管段被使用时,环可以在管段中被去除。 因此,可以减少或消除对凹槽的损坏的可能性,并且在安装一条混凝土管道期间,直到实际使用管段之前,沟槽可以保持没有污物和其它异物。
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