When using a wet spray manipulator for spraying concrete, the following precautions should be observed:

　　1. Preparation Work

　　- Ensure all equipment is installed correctly, connections are secure, and there are no leaks.

　　- Check that power lines, water sources, and air sources are functioning properly.

　　- Confirm that the nozzle, delivery pipes, and other wear-prone parts are in good condition, free from damage or blockages.

　　2. Safe Operation

　　- Operators should wear appropriate personal protective equipment, such as safety helmets, goggles, earplugs, dust masks, and durable gloves.

　　- Place safety warning signs around the worksite to restrict access to unauthorized personnel.

　　- Ensure proper ventilation at the site to prevent the accumulation of harmful gases.

　　3. Material Preparation

　　- Use wet-spray concrete materials that meet the construction requirements, ensuring good workability and adhesion.

　　- Adjust the concrete mix according to the designed water-cement ratio to achieve the desired spray effect.

　　4. Equipment Commissioning

　　- Conduct a trial spray before formal operations, adjusting system parameters such as nozzle aperture, spraying pressure, and the distance between the nozzle and the working surface to achieve uniform spraying.

　　- Ensure the flow control system of the wet spraying machine provides a stable concrete supply.

　　5. Spraying Operation

　　- Perform spraying in accordance with construction drawings and design requirements, maintaining smooth and consistent nozzle movement.

　　- Avoid spraying in high wind or excessively high temperatures to prevent quality issues.

　　- Control spraying thickness and inter-layer spacing to ensure strong adhesion between layers.

　　6. Maintenance and Cleaning

　　- After construction, promptly clean the nozzle and delivery pipes of the wet spraying machine to remove residual concrete and debris.

　　- Perform regular maintenance, inspect wear-prone parts, and replace severely worn components in time.

　　7. Quality Control

　　- Regularly inspect the sprayed concrete to ensure it meets design specifications and construction standards.

　　- Record construction data, including material usage, environmental conditions, and equipment performance, for analysis and improvement of the construction process.

　　8. Emergency Handling

　　- Prepare an emergency response plan to address potential equipment failures, material issues, or other unexpected situations.

　　By adhering to these guidelines, efficient, safe, and environmentally friendly operations of the wet spray manipulator can be ensured, along with high-quality spraying results.