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
Grouting reinforcement of steel lining in water conveyance tunnel
- Project Background:
Steel linings are widely used in hydropower projects. They are inevitably present in structures such as water conveyance tunnels, sand flushing galleries, tailrace tunnels, and embedded parts. Due to factors such as concrete shrinkage after final setting or vibration during pouring, voids often occur between the steel lining and the concrete. To ensure the stability of the overall steel lining structure, grouting is usually performed to fill these voids. Cement grouting is the primary method. Chemical grouting materials, which have lower viscosity and better mechanical properties, are often used for supplementary reinforcement after cement grouting. Epoxy resin is a common type of chemical grouting material.
- Processing technology:
Steel-lined grouting is typically carried out according to the principle of "from bottom to top, from one side to the other" based on the hollow areas. This means that construction begins in the lower elevation hollow areas before moving to the higher areas. The process is as follows: ventilation inspection and preparation → hammer inspection of hollow areas and scope → hole layout and drilling → welding grouting nozzle → pressure test reagent test to determine grouting volume and pressure → grouting → setting → cutting and sealing the grouting nozzle → grinding the weld surface and rust prevention.
- Technical measures:
1. Steel lining grouting should be carried out from low to high, which can effectively control the loss of slurry, discharge the air and water in the void area, and effectively ensure the grouting effect.
2. When grouting the steel lining, sufficient attention should be paid to the deformation of the steel lining. The void area must be filled without bulging to be considered successful grouting. Monitoring with a dial gauge is an effective measure to prevent steel lining bulging.
3. If chemical grouting is used to supplement grouting after cement grouting, the cement grouting holes (nozzles) should be fully utilized, and the creation of new holes should be avoided as much as possible.
- Quality check
After grouting, check by hammering. A dull sound indicates dense and full filling; a crisp sound indicates that it is not dense or full. If local voids occur, secondary grouting should be performed until the void area is less than the design specification, which can be considered qualified.
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