What are the procedures for curtain wall construction?
1. Construction Sequence: Leveling and layout, check if the construction drawings match the on-site buildings. If there are discrepancies, minor ones can be adjusted on-site. For significant discrepancies, notify the design and construction units. Adjust and modify the design based on the actual on-site conditions.
2. Construction sequence for curtain wall: Leveling - Rear-mounted embedment plate installation - Frame installation - Fire and lightning protection panel installation - Cleaning and sealing - Self-inspection - Acceptance - Handover. The common construction methods for rear-mounted panels mainly require correct installation positions, horizontal and vertical alignment, and accurate chemical bolt placement. Drilling should be done with a diameter larger than the bolt diameter by 2MM, and the depth should be determined by the bolt length, typically exposing the bolts to the wall (including beams and columns) by 40MM. The dust inside the holes must be cleaned thoroughly, and after inserting the drug tube, the bolts should be slowly拧紧 with a mechanical tool; hammering directly into the holes is strictly prohibited. This allows the medication to fully blend and serve as an anchoring function.
3. Prior to frame installation, ensure the pillar positions are correct. After completing the pillars, conduct a self-inspection to confirm accuracy before beginning the beam installation. Key points to note: steel angle welding must meet specification requirements, weld lengths must satisfy design requirements, typically not less than 60MM, and no gaps or air bubbles are allowed. The welds should be even and consistent, slag should be cleaned promptly, and anti-rust treatment should be applied, including two coats of anti-rust paint and two coats of silver paint. Ensure that aluminum angle codes at the beam-piller connections have three self-tapping screws on each contact surface to prevent twisting, deformation, sagging of the beam, and fire and lightning protection according to specifications and construction drawings. Generally, the fire protection layer is installed at the outer edge of the interlayer floor between the facade and the layer. All connecting parts, bolts, and washers must be securely fastened; no looseness is permitted. The pillar joints should use 250MM sleeve connections, leaving a gap of no less than 15MM between the upper and lower pillars, and silicone sealant should be applied. Add anti-corrosion flexible isolation pads between the pillars and steel angle codes to prevent galvanic corrosion.
4. Stone Panel Installation, Hidden Frame Stone Façade Installation: The adhesive layer of stone and sub-panels should be bonded in a clean, well-ventilated indoor environment. The temperature and humidity conditions within the city should comply with the regulations for structural products. The temperature should be between 15-30 degrees Celsius, and the relative humidity should be above 50%. A qualified compatibility report must be obtained before the silicone structural sealant is bonded. The glass surface should be wiped clean before bonding. Typically, acetone is used to clean the bonding area. After cleaning, wait for the acetone to dry before bonding, but the bonding process should be completed within one hour. The bonding must be dense, even, bubble-free, and the surface should be smooth. Keep records of the bonding process and all relevant tests. The curing time for one-component structures after bonding is required to be 7-10 days.
