The statement that the tail diameter of the wooden upright post of the support system should not be less than 8cm is correct. The reason is that the external frame is not tied properly. Lesson: Important safety measures such as the wall parts of the outer frame cannot be dismantled at will, but should be tied according to the specifications.
expanding knowledge
the supporting system consists of two parts, i.e. inter-column support and roof support, which are used to strengthen the overall spatial stiffness and stability of the factory building structure, and mainly transfer the horizontal wind load and the punching force generated between cranes.
the reason
the quick-release system of the combined roof formwork with woodworker I-beam and square steel tube is a simple and convenient quick-release support system for the roof formwork, which is developed by Beijing Urban Construction Fifth Construction Engineering Co., Ltd. in view of the shortcomings of the traditional roof formwork support method.
this technology is based on the effective use of the commonly used formwork supporting materials in the market before 25, and does not need to import and process a large number of special components. The construction technology is simple and practical, easy to popularize, and the use of wood is small, which conforms to the national environmental protection policy. The key technology "adjustable quick-release jacking" has been declared as a national invention patent. By adjusting the fine-tuning device of the jacking, the formwork support is safer and more reasonable.
characteristics of construction method
1. The quick-release system of the combined roof formwork with woodworker I-beam and square steel tube uses an adjustable quick-release jacking device to remove the formwork which is not affected by the construction load in advance on the premise of meeting the requirements of the specification and ensuring the structural safety, so as to maximize the turnover times of materials, improve the utilization rate of materials, greatly reduce the cost of non-substantive consumption parts and improve the market competitiveness of construction enterprises.
2. The adjustable quick-release jacking in this system solves the problems that the top elevation of other similar devices in the market is not suitable to be controlled before 25, and the jacking and roof appear false after formwork support, which further improves the safety of formwork support and effectively controls the construction quality.
3. This technology effectively uses the commonly used formwork supporting materials in the market before 25. For the current construction enterprises, the original uneconomical formwork supporting method can be abandoned without investing a lot of money to buy complete sets of equipment. According to this method, the construction of roof formwork support system is simple and clear, and workers can master this construction method without too much training, which is an important condition for popularizing this method.
4. Using materials such as square steel pipes and woodworkers' I-beams instead of ordinary square timber as the main and secondary keels can reduce the use of wood, which is beneficial to environmental protection. Traditional roof formwork support system mostly uses 5 mm× 1 mm or 1 mm× 1 mm square timber for primary and secondary keels, which has uneven dimensions, poor bending performance, large deflection and deformation, large amount of wood input in construction, few turnover times, serious waste and uneconomical.
5. The mechanical properties of woodworking I-beam and square steel pipe are better than those of ordinary square wood. The combination of them can give full play to the advantages of materials, and the usage of reusable materials is greatly reduced, thus reducing the labor intensity of workers.