Construction measures for steel structure engineering during rainy season

1.1 Template rainproof measures

　　When stacking templates, the bottom layer must be elevated above the ground to prevent damage from rainwater immersion. Effective ground drainage measures must be taken at the template stacking area to prevent rainwater from accumulating.

　　Before it rains, it is necessary to effectively cover the formwork and wooden back ribs with plastic sheeting in a timely manner.

　　When constructing formwork on rainy days, cleaning ports or water outlets must be left for beam and wall formwork. After the formwork release agent is applied, it should be covered with plastic cloth in case of rain to prevent the isolation layer from being washed away by rainwater. The template isolation layer that has been washed away by rainwater must be repainted before the mold is closed.

　　1.2 Rainproof measures for steel bars

　　Cover the steel bars that have been placed on site for a long time with rain to prevent serious corrosion. The steel reinforcement stacking site must have good drainage to prevent rainwater from accumulating, soaking, and rusting the steel reinforcement.

　　In principle, steel bar welding should be stopped on rainy days. In case of special circumstances during welding, rainproof measures must be taken to prevent rainwater from wetting the welding joints and causing changes or decreases in the mechanical properties of the steel bars, thereby affecting the quality of the process.

　　1.3 Concrete rainproof measures

　　Do a good job in pumping water from the aluminum fluoride plant,

　　When encountering heavy rain, concrete pouring should be stopped to keep the construction joints in a reasonable position, and on-site drainage work should be done well. The concrete in the poured area must be covered with plastic cloth in a timely manner to prevent changing the mix proportion of the concrete, reducing the strength grade of the concrete, and affecting the quality of the project.

　　Before pouring concrete, the dirt and accumulated water inside the formwork must be cleaned up before pouring concrete.

　　Before pouring concrete, it is necessary to accurately grasp the weather forecast to avoid heavy rain during pouring, and sufficient rainproof materials should be prepared on site for covering in case of sudden rain during pouring.

　　During rainy season construction, it is required that the concrete mixing plant adjust the water consumption of concrete in a timely manner according to the actual moisture content of sand and stone to ensure the quality of concrete. When pouring on rainy days, it is required to appropriately reduce the slump of the concrete leaving the factory.

　　1.4 Rainproof measures for steel structures

　　To ensure the normal progress of construction during the rainy season and guarantee the quality of the project. The main processes and climate sensitive processes of this project should be designed with corresponding process measures based on the characteristics of rainy season construction.

　　High strength bolts cannot be installed on rainy days, and there should be no rainwater on the friction surface and high-strength bolts.

　　When the weather is harsh during the rainy season and cannot meet the process requirements or ensure safe construction, construction should be stopped. At this time, attention should be paid to ensuring the safety of the work surface and setting up necessary temporary reinforcement measures.

　　During rainy season construction, it is necessary to ensure that the construction personnel have access to rain proof water equipment. Pay special attention to electrical protection during construction. When it rains, except in special circumstances, high-altitude operations should be stopped, and high-altitude personnel should be evacuated to a safety inspection zone and the power switch should be disconnected.

　　Steel structure hoisting requires hanging facade nets on the outside of the building, installing protective railings at stairwells inside the building, adjacent edges of the building, and openings that cannot be covered.

　　For the components to be lifted, the water on the surface of the components should be cleaned first, especially the friction surface of the components, and the surface layer should be kept dry.

　　Stop the supporting processes of high-altitude lifting and installation in rainy or foggy weather with wind force greater than level 5; Such as welding, laying profiled steel plates, threading high-strength bolts, correcting structures, etc.