Reason: 1. Incorrectly assembled small steel molds, not set according to regulations, resulting in poor overall performance of the structure.
2. The foundation for placing the template was unstable, with no flat surface and inadequate waterproofing measures, leading to settling of the foundation.
3. Utilizing wood-based formwork or plywood for construction, the concrete was not poured promptly after the inspection was passed, leading to long-term exposure to sun and rain, causing surface deformation.
4. Excessive support spacing, resulting in poor rigidity of the steel plate.
5. Concrete pouring for walls and columns was too fast, with excessive pouring height in one go and over-vibration.
Solution:
When assembling modular steel formwork, connecting parts should be placed according to specifications, and the spacing and specifications of the bracing and tension bolts should be set as per design requirements.
2. The spacing of the beam bottom supports should ensure no deformation under the weight of concrete and construction loads. If the bottom support is on a clay foundation, it should be thoroughly compacted first, drainage ditches set up, and long wooden blocks or shaped steel laid down to ensure that the supports do not sink.
3. Upon the acceptance of wooden formwork or plywood formwork construction, concrete should be poured promptly to prevent deformation due to long-term exposure to sunlight and rain.
