Why should the secondary grouting layer of pipe gallery support foundation be padded?

1. Ensure the position and height of the support pad: In the secondary grouting process, in order to ensure the position and height of the support pad unchanged, it is necessary to fix the pad in its original position before grouting to prevent the pad from moving or sinking during grouting.

2. Increase the cohesive force between the bearing and the concrete foundation: During the secondary grouting, the liquid grouting material will fill the gap between the pad iron and the concrete foundation to form a better cohesive force. At the same time, in order to further improve the cohesive force, a thin layer of iron sheet can be added to the pad iron and anti-corrosion paint can be sprayed on its surface, which can enhance the connectivity and stability between the support and the foundation and ensure the safety and reliability of pipe gallery construction.