05 Analysis of the hidden dangers of the use of non-standard structural parts in the suspension mechanism
1. Hidden danger pictures
2. Description of hidden dangers
The hanging basket suspension mechanism uses non-standard structural parts.
Illustrate:
Non-standard structural parts refer to those structural parts that do not meet the standard specifications, also known as non-standard structural parts, and their specific shape, size, and process need to be customized and special processing to meet the requirements. Non-standard structural parts can be divided into many types, such as mechanical fittings, pipe joints, welded components, etc., which can be classified according to specific industries and application scenarios.
3. Basis for hidden dangers
Article 5.1.4 of the Technical Regulations for the Installation, Disassembly and Use of Hanging Baskets for Working at Height (JB/T 11699-2013): Substitutes shall not be used to replace the original parts;
4. Skin disease analysis
The use of non-original parts, the force structure changes, which is easy to cause plastic deformation of the structural parts, and the bearing capacity of the suspension mechanism is reduced, resulting in the instability of the suspension mechanism.
Structural parts refer to the parts that bear the load, transmit the force, support or connect the components in the construction, machinery, vehicles and other engineering projects.
Standard parts refer to parts and components that are manufactured in accordance with unified standards and specifications and have universal applicability, which can be used as components of components.
5. Photos of hidden dangers after rectification
【Example】As long as the components used in the hanging basket for high-altitude work can be installed, they can be products of different manufacturers.
A, True B, False
Correct Answer: B
Analysis: The components used in the hanging basket for high-altitude work should be a set of products manufactured by the manufacturer, and the installation and use unit shall not be modified.
6. Similar accident cases
On August 13, 2000, at a construction site in Beijing, the root front beam and the middle beam of a hanging basket suspension device broke at the joint, and together with the suspension platform, fell from a height of about 15 m to the second-floor scaffolding, killing one person and seriously injuring three others.
Causes:
1) ZLP500 suspension device is used to mix the ZLP800 hanging basket manufactured by another enterprise, and the "small horse-drawn cart";
2) the front bracket without the suspension device installed, and no measures to prevent the beam from rolling over and sliding have not been taken;
3) The overhang size of the beam exceeds the provisions of the instruction manual;
4) The connecting bolts between the beams are small (M8) instead of large (M12), and ordinary bolts are used instead of high-strength bolts, which are installed in violation of regulations.