To enter the tunnel, you must first make a gate, because the soil layer of the mountain is very thin at the beginning of the tunnel, and it is easy for mudslides and landslides! The first step is to make a pipe shed to make the door. Most of them use a steel pipe of 100 to penetrate the mountain forty to fifty meters, and do the initial pressure work! The pipe shed is ready to enter. If the rock formation is good, it is usually excavated in three steps (excavated in three levels)! At the beginning, the excavator had a lot of work, because the space was small, the loader could not get in. The excavator picked up the slag!
After the excavation of the three sections, the excavator was divided into two sections, and the excavator was relatively easy. It was divided into the upper section (section) and the lower section. The upper section used the loader to slag out. The excavator was only responsible for risk clearance and cleaning the section. Risk elimination is to knock down the loose stones on the rock formation with buckets and make safety measures. Clearing the cross section is to chop the entire palm surface clean, so the driller can easily operate (drilling)!
The next operation is using an excavator. Most of the guns that have been dropped in the next operation are excavators. The space is large and the excavator is easy to operate! They are all excavators loaded!
Inverted arch operation, generally, the inverted arch needs to be digged about one meter and eighteen meters deep. It is oval, with both sides shallow and deep in the middle. The inverted arch is the hardest work in the tunnel because it is made of iron and I-beam. It ’s not convenient to load the bridge. The bridge has to be dragged. If the cannon of the Yanggong is not in place, it must be refilled. It is even more troublesome. The Yanggong is almost ten meters long. It's very annoying to drive to the bottom to slag. Although it is said that some bridges are now fully automatic, the bridge does not need to be dragged around, but it is also troublesome. After digging the Yanggong, it must wait for more than an hour before the bridge is set up to get off work!
These repetitive tasks are basically in the tunnel! Nothing technical but grind!
