Sprayed concrete support construction is a common underground engineering support method. It sprays concrete onto the surface of rock or soil under high pressure to form a support structure. Safety is the primary consideration when carrying out shotcrete support construction. The following are a dozen key safety precautions for shotcrete support construction:

   1. Before construction, comprehensive safety technical briefings must be conducted for operators to ensure that they understand the dangerous factors and countermeasures during the construction process.

   2. Construction personnel must wear personal protective equipment such as safety helmets, safety belts, protective glasses, dust masks, etc. that meet the standards.

   3. Check the integrity of equipment such as sprayers, feed pipes, spray guns, etc. to ensure their reliable performance and prevent safety accidents caused by equipment failure.

   4. When dealing with a blocked spray pipe, the machine should be shut down and pressure should be relieved first. It is strictly forbidden to disassemble under pressure.

   5. The spraying operation area should have good ventilation conditions to remove dust and harmful gases and protect the health of construction personnel.

   6. Electrical equipment at the construction site should comply with the safety electricity use regulations, and leakage protection devices should be installed to avoid electric shock accidents.

   7. When working at high altitude, a solid working platform and guardrails must be set up, and workers should wear safety belts.

   8. The placement of the sprayer should be stable and firm to prevent tipping during work.

   9. During the construction process, the changes in the surrounding rock should be closely observed. If there is any abnormality, the construction should be stopped immediately and corresponding treatment measures should be taken.

   10. Strictly abide by the safety regulations of blasting operations, ventilate and eliminate risks in time after blasting to ensure the safety of the construction environment.

   11. During the transportation of materials, the safety performance of the transportation equipment should be ensured to prevent materials from falling and injuring people.

   12. Obvious safety warning signs should be set up at the construction site, and unrelated personnel are prohibited from entering the construction site.

   During the construction of shotcrete support, by strictly following these safety precautions, the safety risks in the construction of shotcrete support can be minimized and the life safety and health of construction workers can be guaranteed.