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
Governance of large deformation diseases in segmented structure
- Governance Approach:
An integrated tunnel safety assurance system covering "design, construction, and operation and maintenance" needs to be established; operation and maintenance should adhere to the maintenance and repair concept of "inspection, evaluation, repair, control/rescue".
- Governance Guiding Principles:
Develop tailored solutions based on specific circumstances; improve standards, refine operations, and standardize work; adhere to the principle of "emphasizing inspection and exercising caution in construction"—to standardize and normalize the inspection, assessment, and maintenance of tunnels, making them more targeted.
- Technical Solution (Structural Reinforcement Measures):
First, temporary reinforcement of the tunnel is achieved by pasting aramid fabric (full name: aromatic polyamide fiber). Aramid fabric is first pasted to strengthen segments with longitudinal seam openings ≥20mm. Segments with serious water leakage or fragmentation are repaired first, followed by full-surface elastic epoxy grouting for the entire surface, and the interior is reinforced by injecting solvent-free epoxy grouting material.
Second, steel ring support and reinforcement measures are adopted for some tunnel segments. For segments with transverse deformation ≥120mm, steel rings are used for reinforcement; some segments are reinforced with half-rings, and some with full rings. After grouting is completed, annular steel plates are installed on the inner side of the segments as permanent reinforcement for the tunnel. The size of each steel ring section needs to be determined in advance through on-site layout to ensure a tight fit between the steel ring and the inner wall of the segment. Steel plates are fixed using expansion bolts. The edges of the steel plates are sealed with elastic epoxy grouting, and rigid solvent-free epoxy grouting material is filled and injected between the steel ring and the concrete segments for reinforcement.
- Material Selection:
HK-WG solvent-free epoxy grouting material, MB-968 elastic epoxy mortar
Material System Selection:
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