Closed Circuit Television Survey & ​Manhole Survey
沙井測量及地下管道視像探測

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To inspect sewerage system, storm water drain pipes and associated manholes/entry points by Closed Circuit Television (CCTV).​

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A CCTV inspection is designed to discover and ascertain the structural, services and construction condition of the foul and storm water drains and in particular, to provide data assessing;
1. The structural integrity of the pipeline system
2. The service condition of the pipeline system
3. The possible cause and effect of any extraneous water infiltration/exfiltration to/from the pipeline system
4. The location and extent of expedient connections to the pipe line system
5. The location and structural condition of associated manholes

For CCTV Survey, all in accordance with the formal laid down in the WRc “Manual of Sewer Condition Classification” 4th Edition.

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Our Manhole surveying team undertake detailed measurement surveys of public, private and Industrial sewerage assets of all types. 
Manhole surveying team record all evidence of the structural and surface condition of the manholes, also inspect any leakage or infiltration, measure the manhole cover levels and invert levels and determine the location. ​Check that all manholes noted on the base plan. Compare the practical situation with the record plan. Find out the reasons if the manholes  are failed to carry out inspection.

Advanced Technique for Manhole Inspection:
**Laser Scanning is applied**
3D point cloud model of the manhole is generated. It provides high quality measurement data for manhole survey and photo records.

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