(1) Construction of Pingyudongkou 1. The distance between the top of the tunnel section and the bottom of the pile or the bottom of the tillage layer should not be less than 3m. 2. Advance support should be done before the construction of the flat raft. At present, the construction of the pipe shed method is promoted, and the large pipe shed and the small pipe shed are divided. 3. The front slope and the back slope of the Pingyu Cave must be reinforced according to the regulations, and the retaining wall and the flood prevention ditch should be built on the upper surface of the arch. The upper water flows through the two sides of the ditch to the outside of the site. 4. The ground exit of the flat or inclined shaft is generally provided with a hole door. (2) Pingyi tunnel construction 1. Drilling and blasting operation: The artificial rotary eye-cutting machine is used to manually drill the eye. The working surface is equipped with a rock drilling rig, and the blasthole is more than 3m deep. The blasting adopts a reverse charging structure, which adopts a large parallel connection method to initiate a single explosion. 2. Loading rock and draining: For the large-section flat working face, the bucket loader is mostly used, and the bucket capacity is 2--3m 3 , and the dump truck is used. Set a car to avoid every 100m. 3. Support work: (1) Bolt drilling: firstly arch the anchor, the two gangs lag 1 - 2 rows, from top to bottom, from the back to the front row. (2) Shotcrete construction: the initial spray of the working face, that is, temporary support. Re-spray at 50m, which can work in parallel with the working surface. 4. Ventilation and dustproof: Ventilation can be carried out by using a counter-rotating fan and a non-combustible rubber air cylinder with a diameter of about 1000mm to press-fit ventilation to the working surface. When the ventilation distance reaches 1000m or more, it is necessary to add another air duct for air supply. The dustproofing of the working face can be comprehensive dustproof measures such as wet rock drilling, rock spraying spray watering, concrete spraying dust reduction, enhanced ventilation and dust removal, and personal protection. Popcorn Equipment,Hot Oil Popcorn Machine,Electromagnetic Heating Popcorn Machine,Stainless Steel Popcorn Machine Jinan RuiHan Trading Company Limited , https://www.ruihangroup.com
The construction method of gentle slope and inclined slope with angle less than 5.5° is similar to that of roadway.