Solutions
Four solutions are summarized for different scenarios: defect treatment of hydropower engineering, defect treatment of high-speed rail transit engineering, defect treatment of water resource environment engineering, and defect treatment of new energy power generation engineering
Water conservancy concrete structure joints, deformation joints (expansion joints) leakage treatment
- Project Background:
The stilling basin is a crucial flood discharge and energy dissipation facility for dam projects, playing a key role in the stability of the dam's downstream riverbed foundation. The stilling basin at the Baihetan Hydropower Station is the world's largest counter-arch type stilling basin, measuring 360 meters in length, 130 meters in width (chord length), with a counter-arch circular arc radius of 107.02 meters, a 4-meter thick bottom plate of concrete, and a total concrete volume of approximately 500,000 cubic meters.
The stilling basin adopts a counter-arch type bottom plate with a compound trapezoidal cross-section design, equipped with abutments and side walls on both sides. This design combines ensuring the stability of the basin with improving the hydraulic conditions of the bottom plate. Once filled with water, it will form a stilling basin with a depth of 48 meters, undertaking the task of flood discharge and energy dissipation with high head, high velocity, and enormous discharge.
- Basis of the scheme:
After the completion of the concrete pouring for the water cushion pond counter-arch bottom slab, a water stop check was conducted. Leaks were discovered in the water stop of the water cushion pond counter-arch bottom slab. After discussion and consultation among the four participating parties, and drawing on successful experiences from previous projects, it was decided to first perform chemical grouting on the left ② zone of the water stop check. The decision to grout the remaining zones on both the left and right banks will depend on the effectiveness of the treatment, aiming to eliminate leaks and ensure water flow.
- Solution:
LW water-soluble polyurethane grouting material: HW water-soluble polyurethane grouting material = 3:7 (weight ratio) mixed slurry grouting treatment;
- Processing result:
In May 2020, the Baihetan Hydropower Station's stilling basin was first filled with water. On November 27, 2020, water began flowing through the dam's bottom holes, and the stilling basin officially began to undertake flood discharge and energy dissipation tasks. After a year of safe and stable operation, in order to further understand and improve the condition of the stilling basin facilities and ensure the safe operation of the dam, the stilling basin began to be drained on December 10, 2021, and the draining was completed on January 25, 2022. The Baihetan Hydropower Station's stilling basin then commenced its first inspection.
- Check results:
Inspection results show that the pond concrete is basically free from erosion damage and abnormal structural damage, the bottom plate of the foundation pit is smooth and flat without cracks, and there is no leakage in the bottom corridor, which means that the water cushion pond of the Baihetan Hydropower Station has passed the long-term operation test with high quality. (From "Three Gorges Micro" report on April 8, 2022)
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