| 摘要 |
<p>The pipeline sealing unit (1) has a platform (9) on which an arm (10) is pivotally mounted. At the free end of the arm (10) there is a nozzle (14) which is shaped so as to be inserted at least partially within a joint to be sealed. A camera (22) is mounted on the arm (10) and is used to position the nozzle (14) accurately within the joint. A service tube (5) is also provided which connects the platform (9) to power and sealant supplies. The sealing unit (1) is used to repair pipeline joints by injecting low-viscosity sealants into the joints. Once the sealing unit (1) is inserted into a pipeline it is capable of treating or repairing more than one pipeline joint thereby significantly reducing the cost and inconvenience of large sections of pipeline being excavated. Moreover, the sealing unit is intended for use whilst the pipeline remains operational thereby limiting any inconvenience to users of the service .</p> |
