| 摘要 |
PURPOSE: A self-propelled repairing apparatus for a shearing area in an underground pipe is provided to control the thickness of mortar inside the underground pipe by control the jetting amount of mortar per unit. CONSTITUTION: A self-propelled repairing apparatus for a shearing area in an underground pipe comprises a connector(133), a hose connecting pipe(132), an outer pipe(135), a gear-box(139), a rotating member and a jetting nozzle. The backend of an inner pipe(131) is connected to the connector to rotate. The hose for external mortar supply is inserted in the hose connecting pipe. The outer pipe forcibly delivers high pressure external air.
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