Concrete leakage typically originates from micro-cracks, cold joints, honeycombing, and insufficient compaction around reinforcement. In tunnel environments, groundwater pressure amplifies these defects, forcing water through even hairline fissures. Over time, chemical attack (e.g., sulfate or chloride ingress) degrades the concrete matrix, accelerating structural deterioration. According to industry surveys, over 60% of tunnel maintenance budgets worldwide are allocated to leakage-related repairs, underscoring the economic impact of poor initial lining quality.
The consequences extend beyond direct repair costs: water intrusion can corrode reinforcing steel, reduce tunnel clearance for equipment, and pose safety hazards from falling concrete spalls. Addressing leakage after construction is expensive and disruptive; the optimal strategy is to prevent defects during the casting stage.
Precision tunnel lining molds are engineered to produce tunnel segments or in-situ linings with consistent geometry and surface finish. Unlike standard formwork, these molds feature CNC-machined contact surfaces, hydraulic closing systems, and integrated waterstop holders that ensure tight fit between segments. When concrete is cast in a precision mold, the risk of step discontinuities, uneven cover, and trapped air pockets drops significantly.
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