Floor Expansion Joint Leakage Analysis Diagram

Common causes of leakage at expansion joints analysis as follows

1. Inadequate Waterproof Design: The waterproof design of the expansion joints is overly simplistic, failing to meet the expansion requirements. Selection of Waterproof Sealant Material: Originally, the waterproof sealant material was a standard type of sealant, with low resistance to aging and expansion, leading to the aging and cracking of the waterproof layer. The exposed ends of the waterproof layer at the junction are subjected to long-term high-temperature exposure, making them prone to aging and peeling off from the base, thus losing their waterproofing effectiveness. Consequently, 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 force of wind pressure, washes away at the damaged ends of the waterproof layer, seeps into the waterproofing and leaks into the lower space.
3. Rainwater seeps into the waterproofing layer through cracks or joints in the insulation layer's ground, causing it to be submerged for a long time. Water then infiltrates through poorly sealed or cracked joints at the overlaps of the waterproofing layer and at pipe roots or weak points, as well as through defects in the layered subcontracting after the waterproofing layer is completed. During the insulation layer installation process, damage to the waterproofing layer is inevitable, allowing water to seep in through cracks and breaches, forming long-term water accumulation within the waterproofing layer. This leads to minor leaks during rainy days and major leaks when the weather is clear.

Expansion joint waterproof reinforcement structure diagram

Features of Waterproof Reinforcement Plan for Expansion Joints

Expansion joint waterproof reinforcement construction plan selects waterproof materials that match the structural layer defects of the expansion joint and the construction environment. The root angles of the expansion joint vertical walls, as well as cracks and voids in the floor slab base surface, are treated with stop leak liquid for rigid reinforcement. The rigid waterproofing layer is formed into an arc shape, and non-curing rubber waterproofing layers are applied to the floor slab and vertical wall base surfaces. The chemical reactions are complemented by physical adsorption to form a rigid-flexible waterproof adhesive bond, which effectively eliminates stress generated by the changes in the base layer of the expansion joint vertical walls. This ensures that the蠕变型non-curing rubber waterproof layer has sufficient tensile strength, effectively resisting the destruction of external stresses.