What are the precautions for outdoor pipeline construction in rainy season and winter?

1. Pay attention to keep the drain open. If it is necessary to cut off the drainage ditch, it must be approved before implementation, and appropriate treatment schemes should be taken to ensure smooth drainage on site.

2. The rainwater discharged from the site must be precipitated before being connected to the municipal pipe network, so as to prevent the pipe network from being silted and blocked due to mud brought into the pipe network, which will affect the drainage work at the site.

3. A certain amount of rain-proof materials (ponchos, plastic films, etc.). ) rainy days must be prepared, and outdoor construction should be suspended if the rainfall is too large.

4. Scaffolds, roads and steel platforms used on site must take appropriate anti-skid measures to ensure safety.

5. Electrical equipment, distribution boxes and other facilities must be rain-proof and flood-proof, and grounding devices should be installed. The height of the electric box shall not be less than 0.6m The leakage protection device of the mobile distribution box must be sensitive and reliable, and the mechanical equipment should have a canopy. The power supply line should be well insulated, and the metal shell of the equipment must be well protected and connected to zero.

6. During the construction, full-time electricians must check the power lines at any time, repair or replace the damaged cable facilities, and prevent leakage when it rains, which will affect the site safety.

7. The installed pipelines and equipment must be inspected, the remaining accumulated water should be removed in time, and anti-corrosion treatment should be done. Exposed pipes or equipment on the construction site shall be covered with waterproof materials; Pipes, nozzles and pipe joints laid in damp places shall be sealed.

8. Lightning protection must be done well during the rain period. Tower cranes, passenger elevators and steel platforms on the construction site should be equipped with corresponding lightning protection devices, and lightning rods should be installed on the top of construction equipment or buildings. The grounding wire, lightning rod and grounding body must be welded on both sides (the length is greater than or equal to 6d), and the grounding resistance meets the requirements.

9. Implement special materials for typhoon prevention and flood control, put them in storage for later use, and shall not be used for other purposes; During typhoon prevention and flood control, no less than 2 people shall be arranged to be on duty in turn every day, report the danger in time and organize emergency rescue in time.

Two. winter

1. Before winter, organize relevant personnel to conduct a comprehensive inspection, make preparations for winter on the construction site, including temporary facilities, machinery and equipment, heat preservation, etc., timely check the places where overpressure and water-filled pipes and accessories are easy to accumulate water, and thoroughly drain them to prevent freezing accidents;

2. Organize technical personnel, foremen and site management personnel to carry out winter construction disclosure and clarify responsibilities.

3. In winter construction, it is necessary to do a good job in antifreeze and heat preservation of water pipes, and conduct safety technical disclosure in combination with winter construction conditions, and the operation surface should be equipped with sufficient fire-fighting equipment;

4. When welding pipes in winter, it should be arranged above 0℃ as far as possible, and welding is not allowed when the ambient temperature is lower than-10℃; When the ambient temperature is lower than -5℃, in addition to observing the relevant provisions of normal temperature welding, the welding process parameters should be adjusted, the welding current should be increased appropriately, the welding speed should be slowed down, and the weld and heat affected zone should be cooled slowly;

5. In the working environment with narrow space or conditions, if the working time is long, doors and windows should be closed or reliable heating methods should be adopted to keep the ambient temperature above 5℃;

6. The pipeline pressure test can only be carried out when the ambient temperature is higher than 5℃. Before the pressure test, the system pressure test plan shall be prepared according to the system characteristics and site conditions, and submitted for approval. After the pressure test, reliable measures should be taken to drain the remaining water to prevent the pipeline from freezing and cracking;

7. The winter construction climate is cold and the ice surface is slippery, so it is necessary to strengthen safety work and protect the "four ports" and "five sides". Temporary roads, scaffolding and steel platforms on site need to be cleaned in time, and appropriate anti-skid measures should be taken to avoid accidents; Regular safety education should be given to personnel working at high altitude and crossing.