Self Drilling Anchor Bolts
The Self-Drilling Anchor Bolts System is comprised of a hollow threaded bar with an attached drill bit that can perform drilling, anchoring and grouting in a single operation. The hollow bar allows air and water to freely pass through the bar during to remove debris and then allow grout to be injected immediately after drilling is completed.
Self drilling anchor bolts is composed of hollow anchor bar, coupler, nut, drill bit, plate, and cen- tralizer. It can combine drilling, grouting and anchoring in one process. Self-drilling anchors are the advanced type of fully threaded hollow steel tube rods. SDA is a fully threaded rod with an inner and outer diameter hollow steel tube.
It is provided with a sacrificial drill bit at the end to facilitate the drilling process, coupler to join two SDA bars, screw nut, base plate, etc.
The hollow bar allows air and water to freely pass through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling is completed. Grout fills the hollow bar and completely covers the entire bolt. Couplers can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension.
Grout fills the hollow bar and completely covers the entire bolt. Couplers can be used to join hollow bars and extend the bolt lenght while nuts and plates are used to provide the required tension.
Jb Rock Bolts are the largest manufacturers, suppliers and exporters of all types of Self Drilling Anchor Bolt System in India.
JB Engineers Offers Self Drilling Anchors in variants of R25, R32, R38, R51 and T76 and their accessories including the Anchor Nut, Anchor Plate, Anchore Couplers and Drilling bits.
Rocks bolts
Rock bolts, which are commonly assigned the general term ”rock bolts”, are used for rock reinforcement in Mining and Tunneling. Rock bolts limit the loosening of blocks out of the rock mass and shear displacements. Furthermore, the frictional force between individual rock layers is increased.
Main Advantages
- Adaptable rock bolt system – installation in jointed or soft rock
- Standardized and field-proven rock bolts
- Resistant against blasting vibrations
- High bolting forces at short bond lengths
SN-BOLTS
The SN-Bolts are used for mining, tunnelling and specialised civil engineering. The securing in a borehole is made by the mortar fill process where mortar is first added to the borehole, starting from the deepest level of the bore hole and then the anchor is driven into the fresh mortar.
MAIN ADVANTAGES
- Field-proven rock bolt system
- Effective and standardized installation
- Embedding of the tension member in grout guarantees optimal bond strength
- Low sensitivity concerning the actual diameter of the anchor borehole
- ALWAGRIP special rib geometry for optimized bond strength available on request
Componet Of Self Drilling Anchor Bolt
Threaded Hollow Bar
Hollow Bars have a continuous external thread with an R (rope thread) or T (trapezoidal thread) profile.
Couplers
Flexibility in length by using couples. A specially designed stopping system ensures that the coupler is correctly positioned on the bars to be coupled.
Nuts and plates
The plates and nuts are used to create the anchor head. There are straight nuts and spherical nuts, each with their appropriate plates.
Drill bits
Choice of drill bits for different ground conditions.