Release of basic requirements for site inspection of dam safety of hydropower station

In order to further standardize and hydropower station dam safety regular inspection related on-site inspection work, recently, the state energy bureau dam safety supervision center according to the relevant provisions of the hydropower station dam safety regular inspection supervision and management measures " ( guoneng safety [ 2015 ] No. 145 ), formulated and issued the" hydropower station dam safety on-site inspection basic requirements " ( dam supervision safety [ 2015 ] No. 54, hereinafter referred to as the" basic requirements " ).

" basic requirements" pointed out that the scope of on-site inspection mainly includes water retaining structures ( including diversion hole plug ), drainage and energy dissipation structures, water and navigation structures such as water retaining structure, near the dam bank and the building engineering slope, the buildings and structures of the gate and hoist, the building and slope safety monitoring facilities, etc. On - site inspection by the hydropower station operation unit is responsible for organizing the inspection team to carry out inspection. The on-site inspection team consists of relevant professional and technical personnel familiar with the project. The parts difficult to check by conventional means shall be completed by professional units. Dam safety regular inspection expert group shall conduct on-site verification of major defects and hidden dangers found in the on-site inspection. The operation unit of the hydropower station shall, according to the inspection results, put forward the on-site inspection report.

Among them, the water retaining structure inspection mainly includes dam foundation inspection ( focus on leakage, deformation, erosion and scouring, etc. ), concrete dam body inspection ( focus on the dam deformation, damage, cracks and leakage ), earth-rock dam body inspection ( focus on deformation, erosion, leakage, collapse, etc. ), diversion hole plug inspection ( mainly check the plug concrete and plug surrounding rock cracks, water seepage, calcium evolution, total leakage near the outlet water change, turbidity, etc. ).

Discharge and energy dissipation structure inspection is the focus of the flood discharge capacity and operation, to deal with the water inlet, flow parts and downstream energy dissipation facilities and other disciplines for inspection. The main inspection items include shore spillway inspection; Dam body overflow surface hole, sluice inspection; Dam body drain hole ( pipe ), drain culvert pipe inspection; Drainage tunnel inspection.

During the water retaining structure inspection of water conveyance and navigation buildings, the water inlet of water conveyance ( power generation ) shall mainly check the water inlet structure for cracks, leakage, wear, carbonization, steel corrosion and freeze injury, etc. Navigation structure water retaining structure inspection including building cracks, leakage, wear and tear, carbonization, steel corrosion and frost damage, etc.; The sluice chamber, raft road, slope road, water gallery have no uniform settlement; Structural joints and drainage pipe ( hole ) is in good condition; The channel below the check flood level. Other building water retaining structure inspection mainly includes wood, fish and other building inspection items, and can refer to the above content and combined with the structural characteristics of the increase or decrease in the project.

Near dam bank and engineering slope inspection, near dam bank inspection mainly includes near dam reservoir landslide scale, azimuth, distance, to the dam river shape, main geological structure and occurrence; Surface deformation, cracking, dislocation, collapse; Development of landslide and its influence on dam safety. Engineering slope inspection mainly includes water retaining structures, drainage and energy dissipation buildings, water and navigation buildings such as water retaining structure slope supporting appearance.

Reservoir inspection, the focus of the reservoir inspection is near the dam reservoir reservoir leakage, fault activity, floater and so on. The main project for the library surface ( bubbling, whirlpool; Source and extent of floaters, etc. ) and the library week ( leakage; New spring dew; Water seepage pits in the vicinity; Subsidence of roads and buildings; Reaction of other buildings on the same geological structure as the dam ).

Gate and hoist check mainly check the discharge and energy dissipation structures, water and navigation structures such as water retaining structure of the gate and hoist.

Monitoring system mainly check the water retaining structure of water retaining structure, drainage and energy dissipation buildings, water and navigation buildings, near the dam bank and the monitoring system of the slope of the building project.

Road traffic inspection, road traffic refers to the dam area for inspection and monitoring of the dam and the traffic trunk road necessary for the treatment of accidents. The main inspection items for highway and traffic bridge.