CHASING M2 Industrial Case Studies for Water Conservancy Project
Inspection of Laxiwa Hydropower Station Case Background
In May 2019, the surface of the water cushion pond of Laxiwa Hydropower Station was repaired.in order to understand the erosion situation of the water cushion pond after long-term flood discharge, check the surface repair area of the water cushion pond, and search for potential safety hazards, CHASING M2 was used to conduct surface inspection of the underwater part of the water cushion pond.
Date: June 8, 2020 - June 9, 2020
Location: Xiwa Town, Guide County, Hainan Tibetan Autonomous Prefecture, Qinghai Province.
Description of the site:
The outlet of Laxiwa Power station has been closed during the test. Due to the water-holding effect of the second dam, the overall water flow in the water cushion pond is gentle and basically in a state of static water, with visibility of about 0.5 meters and water depth of 20-30 meters.
Inspection preparation:
Scheme of Inspection
Inspection Process of Water Cushion Pond
Inspection & Analysis
M2 captured the image of the dents left behind in the repair area of the water cushion Pond platform.
Erosion image of expansion joints in the repair area of water cushion pond platform.
M2 captured the steel head reserved for the construction of the water cushion pond platform.
Reinforcement bars not cleaned after the surface construction of the water cushion pond platform.
There is a small amount of silt on the surface of the repaired area.
There is a small amount of silt on the floor and side walls of the water cushion pond, and scour on the walls.
Vertical scour image of the platform below the dam.
Vertical scour image of the platform below the dam.
Image of scour gap between the dam platform and the water cushion pond platform.
Inspection Conclusion
CHASING M2 successfully completed the recording task of underwater image in the repair area of the water cushion pond, including detecting the quality defects in the repair area of the floor of the water cushion pond and close-up video of the area with exposed reinforcement and flushing pits.
The underwater video image analysis results are basically consistent with the underwater topographic map and underwater multi-beam sonar scanning image results, which can determine the current specific situation of the water cushion pond, and make relevant decisions - the shallow surface scouring area at the bottom of the water cushion pond can be temporarily not repaired, and some serious erosion gaps can be repaired in appropriate time.
It is suggested that the underwater quality of the water cushion pond should be tested regularly to grasp the scouring situation of the water cushion pond under the high-speed water flow, and the defect repair should be arrange a period according to the specific situation of the water damage.
Inspection Summary
1. Traditional inspection is mainly conducted by divers or large ROV-leased underwater robots. Manual patrol inspection has great safety hazards and large ROV-leased costs. M2 is a light industrial small size underwater robot, safe, economical and easy to operate, improving work efficiency and safety.
2. CHASING M2 ROV is equipped with 4K anti-shaking lens to provide clear image data for underwater patrol and assist the accurate analysis of the results of topographic sonar mapping.
3. When users observe a section of the rock mass, they need to keep the machine moving smoothly from left to right or at ±90°. M2 has 8 Vectored thrusters layout which allows OMNI movement in all directions.
4. CHASING M2 is a platform design and supports multiple mounts. External LED lights and laser calipers are mounted during the dam inspection, which significantly improves the operating efficiency.
5. CHASING M2 can be equipped with 200WH battery and support battery removal and replacement to extend operating time.
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