Le 4 août 2014, 10:30 dans Beauté • 0
Hollow bar system can be used in many kinds of conditions, such as tunneling, mining, civil construction and hydroelectric station. Hollow bar has advantages in all applications where normally cased drilling is required.
1. Fast drilling and placing due to drilling, anchor installation and grouting in a single operation.
2. Neither spearate anchor installation nor removal of casing and drill rods.
3. For all ground conditions, hollow bar system has the similar installation methods.
4. There are many different choices drill bits for different ground conditions.
5. There is a hollow core in the middle of the hollow bar. It is designed to serve for flushing with air or water during drilling, and for grouting the anchor tendon.
6. The length of hollow bar is flexible by using couplings.
7. Hollow bar has the ability to work with small drill rigs without casing in restricted headroom conditions.
8. Accommodation of needs for enhanced protection against corrosion upon request.
9. The high standard of quality control from production stage to installation of the hollow bar is the guarantee of the quality.