Useful Knife Knife Kitchen Knife, Paring Knife, Utility Knife, Slice Knife, Santoku Knife, Chef Knife Set YANGJIANG TRI-WIN INDUSTRY & TRADE CO.,LTD , https://www.triwintableware.com
1. For studios, studios should be 30 to 50 cm larger than the design section (such as a long tube shed in the hole).
2. Construction guide arch, installation of the catheter, the length of the catheter is 2 ~ 2.5m, the diameter of the tube should be greater than the diameter of the tube 20 ~ 30mm.
3. Drill the working platform. The working platform must be able to withstand the live load capacity of the drilling rig. Therefore, it must be solid and reliable. The construction in the opening section is preferably located on the ground, that is, the guide arch is only half (curved section). The next half was applied after the completion of the pipe shed (ie, arching the back wall first).
4. The rig is in place and drilled to the design position. (Apply first for holed steel pipe and later for non-hole steel pipe)
5. Jack into the steel pipe to the design position.
6. Pipe grouting, grouting pressure is 0.5 ~ 1.0MPa.
7. Apply a guide arch to the lower wall, first for one side and then for the other to prevent the arch from sinking.
8. Excavation in the cave. Half-section is generally used for excavation in the cave. That is, the upper part is excavated first, and then the lower part is used after the bolt rubber is sprayed. (If it is a hydraulic trolley construction, it can be used for full-face excavation. The excavation footage is not more than 1.5m, usually 1m. After the excavation is completed once, a bolt shot is made once or the steel bracket is installed. Pipe section.
Tunnel advance pipe construction technology
Advance pipe shed construction process: