Product Overview:
Shandong Tianhai ECB Waterproof Board is a sheet material for waterproofing projects in tunnels and dams both domestically and internationally. Its molecular weight reaches 250,000. Its performance can be adjusted according to the proportion of ethylene content to meet various application requirements. It has excellent flexibility, cold resistance, elasticity, stress crack resistance, and is lightweight, making it particularly suitable for waterproofing materials on the inner surface of arches. It is an ethylene-vinyl acetate copolymer produced through a two-stage extrusion and three-roller calendering process. The material is semi-transparent and classified as an environmentally friendly material.
Product Features:
※ Chemical corrosion resistance and UV radiation resistance;
※ Aging resistance and good abrasion resistance;
※ Strong puncture resistance;
※ Easy construction and pollution-free;
Application Range:
Waterproofing for newly built railways, highways, municipal roads, light rail transit construction (including bridge decks and tunnels), roofs, underground engineering, water conservancy construction, sewage treatment projects, landfill projects, chemical acid and alkali treatment pools, and other environmental protection projects for seepage prevention and corrosion resistance.
Product Series:
Separate waterproof board: layered installation of geotextile and hanging waterproof board;
Composite waterproof board: geotextile and waterproof board are integrally compounded, with point and strip composites. The product edges have splicing weld seams, and the geotextile is equipped with hanging straps for overall installation on site, completing the work in one go.
Product Specifications:
Polyester needle-punched geotextile: 300-400g/m2
Thickness of PE/EVA/ECB/ECD synthetic resin sheets: 0.8, 1.0, 1.2, 1.5, 2.0mm
Width: 2m-6m;
Construction Points:
Base treatment: Before constructing the ECB waterproof board, measure and check the tunnel clearance, and treat areas with insufficient excavation, uneven surfaces, and exposed anchor rod heads to meet the clearance and base requirements.
Hanging iron wire: First, mark the centerline of the tunnel arch with red paint, and then lay the hanging iron wire along the longitudinal direction of the tunnel on the arch centerline. Next, lay iron wire from the arch to both side walls at intervals of 0.9m (less than the hanging rope spacing of 10cm), and parallel to the centerline of the tunnel. The length of the iron wire at both ends should be greater than the length of the ECB waterproof board by 1m. When laying the iron wire, first drill holes on the initial support surface with a hammer drill, then wedge in wooden wedges. The outer end of the wedges should be flush with the hole. Nails should be driven into the wedges, and the iron wire hung on the nails, then bend the nails to prevent the nails from piercing the ECB waterproof board during concrete construction. Nails should be installed every 2m, and if the tunnel profile is uneven, increase the density appropriately to ensure the iron wire is in close contact with the initial support.
Hanging ECB waterproof board: Align the centerline of the ECB waterproof board with the center of the tunnel arch, tie the centerline hanging rope to the center iron wire of the tunnel arch, and hang the transverse hanging rope from the arch to both side walls. After all are hung, move the platform forward. Repeat the same method to hang the second and third rings until the entire lining cycle segment is hung. The ECB waterproof board should be hung in advance, meaning that the length of the ECB waterproof board hung in each lining cycle should be at least 1m longer than the lining length to ensure a secure joint of the large pieces of ECB waterproof board.
ECB waterproof board joint bonding: The ECB waterproof board adopts overlapping bonding with a lap length of 10cm. When bonding, first clean and dry the surface of the ECB waterproof board at the joint, then evenly brush the adhesive on with a brush. The adhesive should not be too thick when applying. Using a manual iron, place the ECB waterproof board flat on the board, and roll the joint with a roller until the bonding is smooth and firm. After completing the bonding of each segment, support the joint with a wooden board and remove the support after 30 minutes.
Protection of ECB waterproof board: When welding rebar, cover it with asbestos cement boards around to prevent sparks from damaging the waterproof layer. Timely pouring of concrete for protection; during secondary lining, set a protective layer at the waterproof board directly facing the concrete delivery pipe to avoid damaging the ECB waterproof board.
