Using a concrete spraying machine for construction on rainy days or in high humidity environments will face many challenges, such as moisture protection of equipment, performance adjustment of concrete mixtures, and construction safety. The following are the operating measures that should be taken during construction on rainy days:

　　1. Equipment moisture protection and maintenance

　　·Electrical component protection: Use waterproof covers or waterproof cloths to cover the electrical components of the spraying machine to prevent direct contact with rainwater and avoid short circuits or electrical failures.

　　·Mechanical component lubrication: Ensure that all mechanical components are fully lubricated to prevent rust and wear caused by rainwater.

　　·Regular inspection: Before and after construction on rainy days, the equipment should be carefully inspected to ensure that all components are in good condition, paying special attention to the electrical system and transmission system.

　　2. Concrete mixture adjustment

　　·Adjust the water-cement ratio: The air humidity is high on rainy days, and the hydration process of concrete may be affected. Properly adjust the water-cement ratio to compensate for the additional moisture and maintain the fluidity and strength of the concrete.

　　·Protect the mixture: When transporting and storing concrete mixture, use waterproof cloth to cover it to prevent rainwater from seeping in and affecting the quality of concrete.

　　3. Preparation of construction environment

　　·Drainage measures: Ensure that the construction site has a good drainage system to avoid rainwater accumulation and affect the adhesion and stability of shotcrete.

　　·Shielding measures: Set up shielding in the spraying area, use waterproof cloth or temporary scaffolding to protect the area under construction from direct impact of rainwater.

　　4. Safety measures

　　·Personnel safety: Ensure that all operators wear waterproof work clothes and safety equipment, such as waterproof gloves, safety shoes, etc., to prevent slipping and electric shock.

　　·Equipment stability: Check the placement of the spraying machine to ensure that the ground is solid to avoid the ground becoming soft due to rainwater soaking, which affects the stability of the equipment.

　　·Emergency plan: Develop an emergency plan for construction on rainy days, including rapid evacuation of equipment and safe evacuation of personnel, to cope with sudden severe weather.

　　5. Construction quality monitoring

　　Continuous monitoring: During construction in rainy days, the spraying quality and hardening process of concrete are continuously monitored, and construction parameters are adjusted when necessary to ensure that the quality of the project is not affected.

　　Construction using a concrete spraying machine on rainy days requires more detailed preparation and careful operation to ensure equipment safety, construction quality and personnel safety. By taking the above measures, efficient construction progress and quality control can be maintained under adverse weather conditions.