1. Product quality issues
The commonly used portal scaffolding rods on the market are made of 42mm round steel pipes with a wall thickness of 2.2mm. In order to seize the market and compete at low prices, many steel pipe manufacturers consume steel pipes whose wall thickness is lower than the national standard or use unqualified steel materials. The quality of this product has been determined by the quality of its products. Furthermore, many friends in the construction industry mostly use leasing due to their own needs. However, most of the leased scaffolding products are used for multiple purposes. The steel pipes are corroded seriously and the moment of inertia of the steel pipes is also reduced. Therefore, these steel pipes will be a hidden danger to the safety of the scaffolding in the future.
2.The problem of building plan design
The main reason for the collapse of scaffolding and formwork is support instability. Because many construction companies did not stop formwork design and stiffness calculations before the formwork project construction, they only rely on experience to stop the support system layout, so that the stiffness and stability of the support system are lacking. . In addition, in the design and calculation of the formwork support system or scaffolding, the calculation diagram adopts the hinged joint of steel structure, and the rods intersect at one point, while the steel pipe is connected by fasteners, and the steel pipe is subjected to an eccentric load. Therefore, field practice There is a considerable gap between the situation and the design calculation. Some steel pipe materials are severely corroded or worn, and some parts are bent or welded, etc., so that the actual load of the steel pipe can be reduced a lot. Under the condition of poor site management, it is easy to cause instability of the formwork support.
3.The use of norms
Of course, before the scaffolding was erected, many construction technicians did not provide pre-job training to the operators. In addition, some workers were of poor quality and did not follow the procedures, which inevitably caused problems. If some formwork collapse accidents are caused by the operator’s failure to set the shear brace or the spacing of the vertical and horizontal tension rods according to the design requirements, the stability of the formwork is lacking; some accidents are the unauthorised withdrawal of the workers, except for the connecting rods between the scaffold and the building. , Resulting in the overall collapse of the scaffolding; other accidents are the concentrated stacking of building materials, prefabricated components or construction equipment on the scaffolding and formwork, resulting in partial overloading and instability of the members, causing the overall collapse. Therefore, the management of the construction site is disordered, and the operators have not strictly required the installation and removal of supports according to the design, which are also important reasons for the collapse of the accident.
Hunan World Scaffolding manufacturer specializes in the development and production of various building support systems such as portal scaffolds, trapezoidal scaffolds, and disc-buckle scaffolds. It has rich experience in product design and research and development, and is committed to technological innovation to provide new product development and development. Adequate resources and guarantees.
Post time: Jan-04-2022