I. Analysis of leakage causes:
1. Foundation reasons: Insufficient consideration during foundation treatment has resulted in inconsistent settlement coefficients, causing one side of the expansion joint to be higher and the other lower.
2. Design reasons: The waterproof design of the expansion joint is too simple, leading to failure to meet stretching requirements.
3. Selection of waterproof sealing materials: The original waterproof sealing material was a common type of sealant with low anti-aging and stretch performance, resulting in the aging and cracking of the waterproof layer.
II. Leakage control plan for engineering
According to the functional requirements and structural characteristics of the project, we follow the requirements of the "Technical Specification for Waterproof Engineering" and adopt measures such as "multiple defenses", "composite waterproofing", and "node sealing". We select the types of waterproof materials, determine the construction and node methods, and propose corresponding technical solutions.
III. Selection of waterproof materials:
1. 50x50mm water-expanding waterstop strip (compliant with GB/T18173.3-2002 standard). This product has the sealing waterproof function of elastic joint waterstop materials. When the distance between the two sides of the joint exceeds the elastic recovery rate of the elastic waterproof material, due to its water-expansion characteristic, it can still serve as a waterstop within the material's expansion range. The expanded body retains rubber properties, making it more water-resistant, acid-resistant, and alkali-resistant. It is widely used in underground railways, tunnels, and concrete construction joints, expansion joints, and cracks.
2. Two-component polyurethane sealant (compliant with JC482-92 standard). This sealant consists of an A component containing isocyanate groups (NCO) and a B component containing curing agents, reinforcing agents, adhesion promoters, and fillers. When mixed at the specified ratio, it undergoes a cross-linking reaction to solidify into an elastic, strong, and highly adhesive sealing material. This product is mainly used for sealing in building settlement joints, expansion joints, construction joints, airport runways, and bridges.
The company introducing advanced foreign waterproofing and leak-sealing technologies under pressure, using imported high-tech nano-molecular waterproof materials, precisely formulated scientific pressure-reducing grouting new processes, specializes in handling various difficult leak-sealing projects. These include basement leak-sealing, tunnel leak-sealing, sewage pool leak-sealing, culvert leak repair, water tank leak-sealing, settlement leakage handling plans, underwater leak-sealing, dock leak-sealing, mine shaft leak-sealing, cable trench leak-sealing, civil air defense project leak-sealing, expansion joint leak-sealing, interface joint leak-sealing, crack leak-sealing, pump room leak-sealing, settlement joint leak-sealing, dam leak-sealing, underground project leak-sealing, elevator shaft leak-sealing, interface joint leak-sealing projects, cooling tower leak-sealing, construction joint leak-sealing, underwater leak-sealing, etc. Due to the waterproofing of architectural expansion joints being handled by hemp thread and asphalt oil paste filling, factors such as waterproofing aging, contraction, cracking, and inconsistent settlement coefficients have led to leakage phenomena, seriously affecting the normal use of buildings.