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The Important Connection Between Tunnel Waterproof Board Laying And Related Processes

The important connection between tunnel waterproof board laying and related processes

Tunnel waterproofing boards are generally used in the secondary lining of tunnels, and waterproofing works are particularly important. The commonly used waterproof material is polymer self-adhesive waterproof membrane. Polymer self-adhesive waterproof membrane is composed of polymer sheet (PVC, PE, EVA, ECB, TPO, etc.), self-adhesive rubber asphalt compound, and isolation membrane. Among them, the tunnel waterproof effect of PVC waterproof board and EVA waterproof board is better. So how is the connection between the tunnel waterproofing board and related processes?

  1. Smooth blasting and initial support are basic procedures. The smooth blasting effect is good, and the circular spring drain pipe can be arranged along the surface of the surrounding rock smoothly. When the initial support surface is smooth (referring to the vector height/chord length of the surface concave and convex part ≤ 1/6), the waterproof board and jet can be guaranteed The concrete surface is tightly attached, and at the same time, the amount of slack in the tunnel waterproof board between the nails can be easily controlled.
  2. The various drainage pipes behind the lining must be carefully set up according to the design, following the principle of "mainly drainage, combined with drainage prevention" to ensure smooth drainage, to reduce the water pressure behind the secondary lining, and achieve reliable waterproofing.
  3. Before pouring the secondary lining concrete, the scum on the side wall base must be cleaned up.
  4. When pouring the secondary lining concrete, a protective material should be set at the discharge port of the conveying pump to prevent the material flow from the discharge pipe from continuously impacting the tunnel waterproofing board and fraying the tunnel waterproofing board.