What are the skills for wet spraying trolley spraying concrete construction? When wet spraying trolleys are performing spraying concrete construction, mastering the correct construction skills is crucial to improving work efficiency and ensuring project quality. Here are some key construction skills and precautions:

　　1. Accurate mix design

　　- Ensure the accurate ratio of cement, aggregate, water and admixtures, which directly affects the fluidity and final strength of concrete.

　　- Adjust the mix ratio according to site conditions, such as humidity, temperature changes and other factors.

　　2. Good material pretreatment

　　- Aggregates should be clean and dry, and avoid excessive dust or other impurities that affect the quality of concrete.

　　- For construction in humid environments, the amount of water should be appropriately reduced to maintain the optimal consistency of the mixture.

　　3. Control the spraying parameters

　　- Nozzle pressure: Too high will increase the rebound rate, and too low may cause the concrete to be loose. Find the ideal pressure value suitable for the current construction conditions.

　　- Distance and angle: Keeping the nozzle at an appropriate distance from the sprayed surface (usually about 0.6 to 1 meter) and at an appropriate angle (about 75° to 90°) helps reduce rebound and improve adhesion.

　　4. Spray continuously and evenly

　　- Spray as continuously as possible to avoid joint problems caused by pauses.

　　- Move the nozzle in a spiral or zigzag trajectory to ensure full coverage and uniform thickness.

　　5. Timely maintenance

　　- Start maintenance work immediately after spraying, especially early moisturizing maintenance is particularly important to prevent crack formation.

　　- The curing time depends on the specific climatic conditions and concrete type, but generally should not be less than 7 days.

　　6. Monitor rebound rate and dust emission

　　- A high rebound rate means a lot of material is wasted and the subsequent cleaning work is increased. Check the rebound regularly and adjust the process to reduce this rate.

　　- Take measures to reduce dust emissions, protect workers' health, and comply with local environmental regulations.

　　By following the above tips and precautions, you can greatly improve the effect of wet spraying trolley shotcrete construction and ensure the safety and durability of the structure. In addition, regular maintenance and care of the equipment is also an integral part of maintaining its optimal performance.