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Advantages of hollow bar system

Le 4 août 2014, 10:30 dans Beauté 0

Hollow bar system can be used in many kinds of conditions, such as. 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.

The functions and design of self drilling anchor bolts

Le 25 décembre 2013, 08:41 dans Beauté 0

Four functions of self drilling anchor bolts:
1.Effect of suspension.When crossing the surrounding rock which is weak,soft and unstable,the Self-drilling Rock Bolt can fix on the deep and stable rock mass to provide enough tension and overcome the gravity and slide force of the rock mass,preventing the tunnel wall from slipping and falling.
2.Effect of squeezing reinforcement.After the anchor bolt is squeezed by the surrounding rock mass,there will form a compression zone in the surrounding place.Putting in the anchor bolts in a suitable way to make the compression zones into a compression belt.The loose strata of the compression belt will be reinforced by the anchor bolts,improving the the integrity and the supporting load.
4.Effect of composite beams.After putting the anchor bolt into a certain deep of rock mass, the anchor bolts will make the layers of surrounding rock squeeze with each other,increasing the frictional resistance of the rock layers and greatly reducing the internal stress and deflection which is equal to mix the number of the simple composite beam(arch) into composite beams(arch).The bending stiffness and strength of the composite beams will be greatly increased through installing the soil nail to improve the supporting load.The larger the anchor bolts provide,the more useful of the anchor bolts.

The functions and design of self drilling anchor bolts

Le 25 décembre 2013, 08:39 dans Beauté 0

Four functions of self drilling anchor bolts:
1.Effect of suspension.When crossing the surrounding rock which is weak,soft and unstable,the Self-drilling Rock Bolt can fix on the deep and stable rock mass to provide enough tension and overcome the gravity and slide force of the rock mass,preventing the tunnel wall from slipping and falling.
2.Effect of squeezing reinforcement.After the anchor bolt is squeezed by the surrounding rock mass,there will form a compression zone in the surrounding place.Putting in the anchor bolts in a suitable way to make the compression zones into a compression belt.The loose strata of the compression belt will be reinforced by the anchor bolts,improving the the integrity and the supporting load.
4.Effect of composite beams.After putting the anchor bolt into a certain deep of rock mass, the anchor bolts will make the layers of surrounding rock squeeze with each other,increasing the frictional resistance of the rock layers and greatly reducing the internal stress and deflection which is equal to mix the number of the simple composite beam(arch) into composite beams(arch).The bending stiffness and strength of the composite beams will be greatly increased through installing the soil nail to improve the supporting load.The larger the anchor bolts provide,the more useful of the anchor bolts.

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