⑽隧道进洞前，洞顶截水沟、洞口排水系统应完成。洞顶的坍滑土要进行整治,

⑽ Before entering the tunnel, the water intercepting ditch at the top of the tunnel and the tunnel entrance drainage system should be completed. <br>The collapsed soil on the roof of the cave must be rectified, and the geometric dimensions of the gutter and intercepting ditch must meet the drainage requirements, and the distance from the excavation slope line must be no less than 5m. <br>Carry out graded water collection in tunnels, pipe drainage, and prepare sufficient pumping and drainage equipment to ensure normal construction and production during the rainy season. <br>⑾ Small and medium-sized equipment on site must be equipped with rainproof covers or rainproof sheds as required. Mechanical and electrical equipment must be equipped with grounding safety devices. The leakage protection devices of motorized switch boxes must be safe and reliable. Construction cables and wires should be buried underground as much as possible to ensure reliability. Special fixing measures should be taken for exposed poles and wires; insulation testing should be conducted on on-site equipment before the rainy season.

Before entering the tunnel, the intercepting ditch at the top of the tunnel and the drainage system at the entrance of the tunnel should be completed.<br>The collapsed soil at the top of the tunnel needs to be treated, and the geometric dimensions of the gutter and intercepting ditch should meet the drainage requirements, and the distance from the excavation slope line should not be less than 5m.<br>Conduct graded water collection in tunnels, pipeline drainage, and prepare sufficient drainage equipment to ensure normal construction and production during the rainy season.<br>(11) Small and medium-sized equipment on site must be equipped with rain covers or rain shelters according to regulations. Mechanical and electrical equipment must be installed with grounding safety devices, and the leakage protection device of the motorized switch box must be safe and reliable; Construction cables and wires should be buried underground as much as possible, and reliable fixing measures should be taken for exposed poles and wires; Insulation testing should be conducted on site equipment before the rainy season.

⑽ Before entering the tunnel, the drainage system of the intercepting ditch at the top of the tunnel and the hole should be completed.<br> The landslide soil at the top of the cave should be treated, and the geometric dimensions of the gutter and intercepting ditch should meet the drainage requirements, and the distance from the excavation slope line should be not less than 5m.<br> Do a good job in tunnel grading water collection, pipeline drainage and adequate pumping and drainage equipment to ensure normal construction and production during the rainy season.<br> ⑾ On-site small and medium-sized equipment must be equipped with rain cover or canopy in accordance with regulations, mechanical and electrical equipment should be equipped with grounding safety devices, and the leakage protection device of motor switch box should be safe and reliable; Construction cables and wires should be buried underground as far as possible, and reliable fixing measures should be taken for exposed poles and wires; Insulation inspection should be carried out on the field equipment before the rainy season.