ZML160S Tunnel Vertical Coring
Multifunctional drilling rigs encounter various types of rocks during construction, different rock formations with different drilling speeds. The most headache for construction workers is the harder rock! Science has been working on it for a long time, and our R&D team is also making continuous progress. We have our own understanding of coring harder rocks and share it with you...
In the entire machinery industry in China, the performance of drilling rigs have been effectively improved and optimized in the actual application, as well as power and output. At the same time, it is combined with some advanced technical means to enable new high-strength drilling tools to be reasonably used, such as coring rotary drilling rigs.
1. Judgement on preliminary preparation work for coring:
a. Rock hardness and weathering degree of bedrock.
b. Conventional drilling is very low or cannot be drilled;
c. The integrity of the bedrock is high, and the fracture is not developed or less developed.
In this situation, in order to ensure the continuous progress of drilling and the drilling effect, you can choose a cylindrical core bit.
2. Cylindrical core bit
The drill rod is attached with a lock head, which locks each section of the drill rod through a mechanical locking point. It transmits the pressure to the drill bit. The pressure load can reach more than 95%, a large shear force between the drill bit and the rock mass will generate. It is suitable for hard rock formations.
3. The drilling speed should be fast
The coring drill bit drills in and cuts out the annular groove by ZML160S multifunctional crawler drill rig, and then grinds the core off and takes it out as a whole. The line contact of the drill teeth is changed to a rotating annular contact, which can reduce the contact area of the drill bit acting on the rock formation and reduce the running resistance of the drill bit when rotating. I can also reduce the work required for comprehensive grinding and crushing of the rock formation. Under normal circumstances, there is no need to replace the drill bit to realize rapid drilling. Depending on the strength of the rock formation, 25M-40M can be drilled every day.
