Floor Expansion Joint Seepage Analysis Diagram
Analysis of common causes for leakage in expansion joints:
1. Inadequate Waterproof Design: The simple design of the expansion joint waterproofing does not meet the expansion requirements. Selection of Waterproof Sealant Material: Originally, the waterproof sealant was a common type of sealant, with low resistance to aging and expansion, leading to aging and cracking of the waterproof layer. The exposed end of the waterproof layer is subjected to long-term high-temperature sun exposure, and the thermal expansion and contraction due to temperature differences easily cause aging and separation from the base, resulting in loss of waterproofing effectiveness. Therefore, roof leaks are particularly prominent in most cases.
2. The waterproof design of the expansion joint is too simple, resulting in failure to meet the expansion requirements. Rainwater, under the effect of wind pressure, washes away the damaged edges of the waterproof layer, seeps into the waterproofing and leaks into the lower space.
3. Water infiltrates the waterproofing layer over time through cracks or joints in the insulation layer's ground, pooling continuously. It enters at junction edges and weak spots like pipe roots or joints where seals are not tight or have aged and cracked. Additionally, due to defects in layer-by-layer subcontracting, the insulation layer's installation process inevitably damages the waterproofing layer, causing water to seep in through cracks and damages, forming long-term internal pooling within the waterproofing layer. This leads to minor leaks during rainy days and significant leaks after sunny weather.
Expansion joint waterproof reinforcement structure diagram
Features of Waterproof Reinforcement Scheme for Expansion Joints
Expansion joint waterproof reinforcement construction plan uses waterproof materials matched to the structural layer defects of the expansion joint and the construction environment. For the vertical wall root angle of the expansion joint and cracks and voids in the floor base surface, use leak-sealing agent for rigid reinforcement treatment. Form a curved angle for the rigid leak-sealing layer, and apply non-setting rubber waterproofing layer to the floor and vertical wall base surfaces. The chemical reaction, combined with physical adsorption, forms a rigid-flexible waterproof bonding that is firmly adhered, eliminating stress caused by changes in the vertical wall of the expansion joint and the base. This ensures that the creep-type non-setting rubber waterproofing layer has sufficient tensile strength to effectively resist damage from external stresses.
