To inspect the internal conditions of pipeline with a camera which installed on a wheel tractor and can travel along various type and size of pipeline, the internal condition can be record in from of video and photo. A1 - CCTV Survey for pipes, drainage, conduit and watermains A2 - Men Entry Survey for Culvert, Tunnel and other Confined Space work place
To Investigate manholes & to provide detailed information for the design and construction of drainage works and data are recorded in a standardized Manhole Card. B1 - Manhole Structural Survey B2 - Expedient Connection (EC) Survey
To locate and identify all underground utilities, including power and telephone cables, gas, water, drainage and waste pipes, by Non-destructive method and provide utility mapping with the depth and position of these utilities. C1 - Utility Survey for underground utilities C2 - Cable Detection by Competent Person (CP) under Cap.406H C3 - Topographical Survey
To monitor, control, locate, localize and pin-point any suspected leaks from any pressurized water supply system. D1 - Leak Noise Correlation (LNC) Survey by Acoustic Method D2 - Minimum Night Flow Test (MNFT) D3 - Hydrogen Gas Leak Detection D4 - Pressure Management & Control
To inspect and testing of Buried Water Carrying Services in Slope and Hillsides - Checking Typcial Slope Condition. To inspect the potential risk on the slope which affect the stability and the structure of tslope and therefore prevent landslip. E1 - Buildings Department Dangerous Hill (DH) Order
To repair the underground pipeline by trenchless method without excavation. F1 - Full Lining by CIPP method F2 - Part/Patch Lining F3 - Joint Seal Repairing method F4 - Pipe Lining
To detect buried utilities and void on ground and slopes. It produces continuous electromagnetic (EM) waves into underground space. The EM waves carry out the anisotropic information of buried utilities in dielectric parameter, and then reflected back received by antennae. G1 - Utility Survey G2 - Void Detection G3 - Geophysical Survey G4 - Leakage Detection Survey G5 - Building Slab Leakage Detection
To inspect the hydraulic suitability and monitoring the flow condition. H1 - Flow Survey at Drainage, Sewer, Nullah, Open Channel and River H2 - Level Monitoring H3 - Riverbed Survey H4 - Hydrological Survey H5 - Modeling
To inspect the condition of the underground pipeline in various aspect, such as pipe wall thickness, nternal condition, soil condition, etc. I1 - Coating Defect Survey (CDS) I2 - Intensive Ultrasonic Test (IUT) I3 - Stray Current Survey I4 - Soil Resistivity Test I5 - Life Expectancy Survey
J1 - Minor Civil Works for utilities J2 - Utility related works - Pipe Cutting, Grouting work
K1 - Alternation and Additional Works K2 - Renovation Works K3 - Fitting Out Works K4 - Civil Works K5 - Pumping and Drainage Works
3D Laser Scanning is also named "real-scene copying technology", and it can be used as scanning operation in any eqvironment or space. It can directly collect 3D data then rebuild 3D model. Also, the 3D Laser point cloud data can be posted-processed. It is most effective way to get the data of the observed object.
Through 3D modeling, the hazard of buried utility damage during construction activity can be reduced as the related information of underground infrastructure such as depth, length, diameter, and the exact way they are positioned are revealed. Integrating 3D model into the design process would enable engineer to avoid interferences and clashes with existing underground infrast.
