(一) Uneven or non-vertical panels, inconsistent joint widths and heights
1. Causes: Horizontal and vertical deviations in the framework, uneven surfaces, installation errors of the panels, misaligned holes;
2. Preventive measures:
(1) Start carefully with embedding parts and expansion bolts. When installing the framework, use horizontal and vertical lines and ensure the surface is flat, then check with a theodolite for quality control;
(2) Position panels and framework precisely, drilling must be accurate;
(3) During panel installation, don't install randomly. Follow the plan and marked lines. Before installation, check the panel size and shape. Only install after confirming there are no errors.
(二) Poor seam sealing, uneven surface, with air bubbles and water leakage
1. Causes:
(1) When filling the seam, polyethylene foam was not used to back up the panel, so when the sealant was injected with a caulking gun, there wasn't enough pressure, causing the sealant to not bond well with the panel seam and resulting in poor sealing;
(2) Workers were not skilled, and the distance of the gun tip from the seam was inconsistent during caulking, leading to uneven pressure, uneven thickness, more joints, trapped air, and causing the sealant surface to be uneven with bubbles and leaks;
(3) Material issue: the silicone sealant had quality problems.
2. Preventive measures:
(1) Choose good materials and ensure the tools perform well;
(2) Carefully insert the sealing filler, keep the distance from the panel surface consistent, insert the sealant at a uniform depth so the seam is tight and the surface is even;
(3) Workers should be skilled, hold the caulking gun steadily, maintain a uniform speed and distance, expel air as they go, and if bubbles appear, pop them and smooth them out with a spatula to remove the air.
(三) Poor finishing, uneven, not sealed
1. Cause: Construction not carried out as required, installation not detailed, improper method.
2. Preventive Measures:
(1) Prepare a finishing plan before construction, using a reasonable approach for different structures and conditions;
(2) Follow strict procedures during installation and master the key points.
(四) Surface contamination, dents
1. Cause:
(1) Protective film removed too early, improper measures to protect the finished product;
(2) Poor protection of the finished product during subsequent work, causing impacts on the panel.
2. Preventive Measures:
(1) Don't remove the protective film too early; it's better to remove it when taking down the scaffolding;
(2) Develop practical measures to protect the finished product during work;
(3) Clean and wipe any contaminated areas promptly.
