Safety protection of steel structure construction?

The following is the related content of steel structure construction safety protection brought by Zhong Da Consulting for your reference.

1 Analysis on the particularity of welder's working environment and working conditions in the construction site of building steel structure

1. 1 Types and installation technology of copper structure buildings Steel structure buildings can be divided into five categories: light steel structure (including portal steel frame), heavy steel structure, high-rise steel structure, spatial steel structure (including grid, reticulated shell and spatial truss) and residential steel structure. Includes two processes: factory production and field installation. Steel structure construction is a process of hoisting and assembling the processed components to the design position in a certain order, then measuring and correcting, connecting and fixing, and integrating them one by one to finally form a structural system. The installation process method is determined on site according to the type of steel structure engineering. Manual arc welding is generally used in the construction site, and argon tungsten arc welding and CO2 gas shielded welding are used in special cases. Cutting method: oxygen-acetylene flame gas cutting and grinding machine cutting.

12 current situation of construction project management. The project manager responsibility system is implemented in the construction of building steel structure engineering, and the quality and management level of project department personnel are quite different. The general management situation is to attach importance to progress and quality, while ignoring safety.

1.3 working environment of welders in the construction site. The structural characteristics and installation technology of steel structure engineering determine the working environment of welders: 1) aerial work. 2. Open-air operation. 3) Multi-job cross construction. 4) Limited operating space and multi-obstacle environment. 5) The operating position is changeable, and the traffic on site is inconvenient. 6) The construction site is limited, and there are many temporary materials and equipment on site. 7) Severe meteorological environment such as high temperature, severe cold, rain, snow, fog and strong wind. 8) At night, the light is dark and the visibility is low. 9) Environment in contact with live conductors and metal parts. 10) contact with inflammable and explosive articles. 1 1) is exposed to high temperature thermal radiation.

1.4 working conditions of welders on the construction site. Compared with welders in other industries, welders in steel structure construction site have more manual operations and lower mechanization. The mobility of personnel on the construction site is large, the logistics support on the construction site generally fails to keep up, the safety investment is not enough, the labor insurance supplies are not distributed in time, and the protective measures are not implemented in place. The working and living environment and sanitary conditions are relatively poor.

2 Analysis of risk factors of welders in the construction site of building steel structure

2. 1 get an electric shock. Welders have the highest probability of getting an electric shock. Welders are easy to contact directly charged bodies, such as electrode holders, covered electrode, terminals and high-voltage lines, and indirectly charged bodies, such as cables with damaged insulation, leakage welding machine shells and charged metal structures. However, the welder's labor protection articles are defective or not worn, and his body sweats in summer: there are many nodes and bars, narrow working space, many obstacles, short circuit of grounding grid, failure of leakage protection device, and damage of insulation and isolation of welding station; Wet environment such as rain, snow and fog; Insufficient lighting; Construction workers violate the safety operation rules and turn on the power casually, which is likely to cause an electric shock accident.

2.2 Hazard factors of falling from high altitude: unstable climbing ladder and scaffolding; When welding at the working point, do not wear a seat belt or walk on the bar without a seat belt; Seat belt injury; The seat belt is hung low and high, and the hanging rod is unstable; No safety net has been established; Heatstroke, dizziness and standing too fast in high temperature environment; The welder slipped in the snow, rain, wind and fog environment; When cutting components, the components suddenly separate, and the tension impacts the operator; Instability caused by electric shock: welders work at heights with illness.

2.3 Object impact. Risk factors are analyzed from two aspects. 1 welder injured: there is no isolation protection at the crossover operation site. Second, the welder hurts people: the tools and materials on the welder's job site slip, the welder discards the waste at will, the cutting parts are separated, the spot welding parts are not firmly fixed, and the structural parts fall.

2.4 Risk factors of fire and explosion: flammable and explosive gasoline, paint, gas cylinders and decoration materials are stored around or below the welding or cutting points at the crossover operation site, and the distance is not enough, isolation measures and monitoring measures are not taken, and fire control facilities are not in place; Ignition occurs at the lap joint of the welding loop at the storage point of inflammable and explosive articles: personal protective equipment is contaminated with grease, and gas cutting tools such as leakage regulating valve, cutting gun, gas belt and gas cylinder are used; Gas cylinders are exposed to sunlight at high temperature; Bad habits such as purging work clothes with oxygen can lead to fire and explosion accidents.

2.5 Hazard factors of arc burn; Turn off the power switch when the electrode holder workpiece is short-circuited, or turn on the power switch during operation, which will generate arc and hurt your hands; When welding without wearing personal protective equipment, electric arc may cause hand, eye or other exposed skin injuries.

2.6 Risk factors of scalding: contact with welds, cutting seams or uncooled workpieces, and failure to wear protective equipment.

2.7 Hazards of heatstroke: continuous welding in high temperature weather, and the welder sweats too much. Improper construction organization arrangement, blindly grabbing progress. Measures for heatstroke prevention and cooling are not in place. 2.8 Various accidents of welders at the construction site are attributed to specific factors, mainly people, things and the environment. Human factors include the welder himself, other types of workers on site and management personnel. The unsafe behavior of these three types of personnel will cause chaos in the construction site or directly hurt welders. Physical factors include equipment, tools, materials, components and protective equipment related to welding operations, and the unsafe state of these materials constitutes a dangerous factor. Environmental factors mainly refer to the working site environment such as aerial work, crossover operation, open-air operation and bad meteorological environment. The second is the soft environment of project management. Chaos in project management will directly lead to accidents and injuries to welders.

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