3 Steps! Self-Drilling Rock Bolt System Reinforce A Retaining Wall !

In many constructions, we need to build a retaining wall to support the rock or soil, to prevent the slide of the slopes or other constructions. The retaining wall would become very weak after some time, and we must reinforce it to ensure it won't collapse. 

In general, we can take several measures to reinforce a retaining wall, such as shotcrete/sprayed concrete, hollow bar support. The most convenient material to do this is the self-drilling rock bolt system. 

Construction Process

1. Preparation before construction: Check whether the functions of the drilling rig are normal, whether the drill bit and the rod body are damaged, whether the rod body is unblocked, etc. After ensuring that there is no problem, screw the hollow bolt body to be used with the drill bit;
2. Drilling and grouting: The hollow bolt body and the grouting pipe are connected to the drilling rig through a rotary grouting adapter, and grouting is performed during the drilling process to achieve the simultaneous completion of drilling and grouting;
3. Install the plate and nut to the construction surface to ensure the anchoring effect.

Array Requirement

1. The vertical spacing of the upper and lower rows of self-drilling rock bolt should not be less than 2.5m, and the horizontal spacing should not be less than 2m;
2. When the bolt spacing is less than the above provisions or the stability of the rock and soil layer in the anchoring section is poor, the bolts should be arranged in alternate lengths;
3. The thickness of the overlying soil layer of the first row of bolts should not be less than 4m, and the thickness of the overlying rock layer should not be less than 2m;
4. The position of the first anchor point can be set at 1.5-2m below the retaining top;
5. The inclination angle of the rock bolt should be 10°～35°;
6. The arrangement of anchor rods shall be as vertical as possible to the direction of the slope, and shall intersect with the structural plane at a large inclination angle;
7. If the pillars are in the soil layer, the rock bolt should be set near the bottom of the pillars.

Advantages

1. It combines drilling, grouting, and anchoring together, more effectively.
2. There are many types of drill bits. According to the conditions, we can use the most targeted one.
3. The hollow bar can be extended by the coupling or cut for a narrow space.
4. Anti-corrosion. 4 types of anti-corrosion rock bolts are available, stainless steel, epoxy coating, hot-dip galvanizing, and duplex coating.

As we can see, three steps are enough to reinforce a retaining wall with the self-drilling rock bolt system. It would promote the efficiency of the process, decrease the cost of the whole construction.

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Created on Feb 12th 2022 00:50. Viewed 181 times.

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