Infrastructure Engineering (Bridges / High-Speed Rail)
In the construction of bridge pile foundations, pre-embedded grouting pipes are installed down to the bottom of the piles. If sediment or gaps are detected at the pile bottom during inspection, cement slurry is injected through the grouting pipes to fill the defects and improve the bearing capacity of the pile foundations. This process is often coordinated with the quality inspection phase using sonic tubes (i.e., sonic tubes are first used to identify problems, and then grouting pipes are used to resolve them).
Underground Engineering (Tunnels / Subways)
After tunnel excavation, pre-embedded grouting pipes are placed at the segment joints (of tunnel linings). Slurry is injected into the gaps between the tunnel segments and the surrounding rock formation through these pipes to form a waterproof curtain, which prevents groundwater seepage and ensures the safe operation of the tunnel.
Building Restoration Engineering
When existing buildings experience foundation settlement or wall cracks, post-inserted grouting pipes are adopted. Slurry is injected into the foundation soil or wall cracks; through the solidification of the slurry, structural reinforcement and crack sealing are achieved.
V. Usage Precautions
Material Selection
The pipe material must be selected based on the characteristics of the slurry (e.g., corrosiveness, temperature). For example, when conveying chemical slurry, corrosion-resistant materials such as PVC or stainless steel should be used for grouting pipes to prevent pipe corrosion and subsequent slurry leakage.
Construction Specifications
Pre-embedded grouting pipes must be accurately fixed to the structural steel bars to ensure that the grouting ports are aligned with the target defect areas.
During the grouting process, the grouting pressure and slurry flow rate must be controlled to prevent structural damage caused by excessive pressure or insufficient filling of gaps due to improper flow rate.
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