Nodular cast iron pipe for trenchless pipeline repair

• Main Authors: LIU JUNFENG, HE QISHU, MA ZONGYONG, LI YABING, ZHANG TAOZHEN, ZHANG HANGUO, XU GUOFANG, KONG XIANGSHENG
• Format: Patent
• Language: Chinese; English
• Published: 17.12.2021
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; WEAPONS

The utility model provides a nodular cast iron pipe for trenchless pipeline repair, which comprises a pipe body and a rubber sealing ring, two ends of the pipe body are provided with a bell mouth and a spigot, the spigot is provided with a sealing groove, the rubber sealing ring is embedded in the sealing groove, and the spigot and the bell mouth between adjacent nodular cast iron pipes are in bell and spigot connection; a grouting hole is formed in the pipe body and provided with a matched screwed plug. The outer wall of the pipe body and the outer portion of the joint of the bellmouth and the spigot are wrapped with cement mortar, and the cement mortar is injected through the grouting holes. The wall thickness of the repaired pipe can be effectively reduced, the mechanical performance of the repaired pipe can be improved, and reliable guarantee can be provided for long-term safe operation of the repaired pipe. The construction convenience is high, the situation that the outer wall is damaged in the chemical