At present, the progress of science and technology, let us on the tunnel construction requirements in the continuous improvement, and concrete spraying machine equipment has become the standard of the tunnel construction, in the construction, what should pay attention to the requirements of the tunnel grouting? In fact, mainly from the safety and quality of the two aspects to analyze the tunnel grouting notice.
Safety:
1. "safety first, prevention first";
2. Safety helmet shall be properly equipped when entering the construction site;
3. Formulated safety operation rules and disclosed them to the construction personnel;
4. Only after passing the safety examination can you start work;
5, the construction should be from the climbing ladder or ramp up and down, strictly prohibited to climb scaffolding;
6, the workplace should be qualified safety protection facilities, on-site personnel should be equipped with labor protection supplies;
7, temporary houses should be built above the perennial flood level, should be in accordance with the meteorological, hydrological, and other conditions to do a good job of safety.
Spraying quality:
1. Strictly execute the operation according to the requirements of normal construction technology;
2, aggregate to use qualified sand, mud content should not be too large;
3. Spraying is not allowed when the wind is at or above four levels. Spraying construction is strictly prohibited in rainstorm;
4. Before spraying, the base shall be kept clean, mold release agent and free of oil stains, and construction shall be conducted after passing the acceptance inspection;
5. When spraying, the concrete base shall be watered properly in advance to ensure the effective and firm adhesion of the interfacial agent;
6. Mortar spraying material should cover all construction interfaces relatively evenly;
7, the secondary injection injection uneven parts processing in the tunnel spraying to be executed in strict accordance with the matters needing attention, so the effect of spray out will be guaranteed, and tunnel spraying machine has small homework dust concentration, less injection rebound, protection of the environment and save the advantages of the raw materials, improve the quality of spraying layer, and convenient operation and simple maintenance.
The following requirements should be checked before the concrete sprayer works:
1. Check the safety valve of the sprayer is sensitive and reliable.
2. Check the power cord for no rupture and reliable wiring.
3. Check the pointer of the pressure gauge between the upper and lower limits, and adjust the limit value of the upper limit pressure according to the transmission distance.
Before the start of the spraying machine should also be first ventilation, water, electricity, open the inlet valve gradually reached the rated pressure, and then start the motor no-load operation, confirm that everything is normal, before the feeding operation, see the pipeline installation should be correct, the joint should be tight seal. When the pipeline passes through the road, it shall be installed in the geosyncline and covered for protection. Spraying work process, it is forbidden to stand ahead the nozzle, spraying machine operator should always stand in the sprayed concrete body within the team, if the job, when the pause time more than 1 h, should be in the warehouse and all the dry mixture of transporting pipe, the length of time should be a stop charging, then close the motor and stop to compressed air. After the completion of the spraying operation, all the dry mixture in the warehouse and the feeding hose shall be ejected, and the nozzle shall be removed and cleaned to remove the concrete material and debris adhering to the inside and outside of the fuselage. Meanwhile, the spraying pipe shall be cleaned and the seals shall be in a relaxed state. The above analysis hopes to help you! You want to know more about the content can continue to follow us!
