3 Types of Self Drilling Soil Nailing Construction Equipment


In the realm of soil stabilization, soil nailing has emerged as a common method for construction projects in diverse geological settings. Unlike traditional steel bars, self-drilling soil nailing represents a transformative method, streamlining the anchoring process and enhancing construction efficiency. So what construction equipment is available for this self-drilling soil nailing? In this article, we will introduce the three common types of self-drilling soil-nailing construction equipment available in the market.

Understanding Self-Drilling Soil Nailing Construction Equipment

The biggest difference between self-drilling soil-nailing to other common reinforcement types by integrating drilling, grouting, and anchoring functions into a seamless operation. These slender rods, typically encased in cement mortar or grout, establish a reinforced framework within the soil, countering deformation through cohesive forces or friction along the contact interface.

This approach provides a flexible, cost-effective and efficient earth retention solution. The soil nails, connected to structural shotcrete at the exposed face of the excavation, gradually deform towards the excavation as the excavation progresses. This mobilizes the tensile strength of the nails to internally stabilize the retained soil. The nail layout and facing system are designed to create a stable soil mass, which also functions as a gravity block resisting global rotation, sliding, or bearing capacity failure.

The innovative nature of self-drilling soil nailing construction equipment lies in its ability to conduct drilling and grouting simultaneously which is attributed to its connection to the grouting machine, resulting in superior anchoring effects. The equipment's adaptability to diverse geological conditions, including broken rock formations and loose rock-soil layers, positions it as a versatile solution for complex construction scenarios.

Advantages of Self-Drilling Soil Nailing Construction Equipment

Diversified Drilling Methods

Self-drilling soil nailing construction equipment accommodates various drilling methods, such as rotary drilling or rotary percussion drilling, catering to the specific geological challenges encountered during construction. This adaptability is particularly advantageous in scenarios involving soil interbedded with rocks, miscellaneous fill, and pebbles.

Simultaneous Drilling, Grouting, and Anchoring

The equipment's capability to perform drilling, grouting, and anchoring in a single operation streamlines construction steps. This efficiency translates to a construction pace that is 4-5 times faster than traditional methods involving steel bars or anchor cables, leading to an overall reduction in project costs.

Large Construction Work Area

Self-drilling soil nailing construction equipment boasts a maximum lifting height of 3.3 meters, providing a spacious construction work area. This feature allows for the simultaneous drilling of multiple rows of holes, further amplifying construction efficiency.

The Three Common Types of Self-Drilling Soil Nailing Construction Equipment

Crawler Hydraulic Anchor Drilling Rig

The crawler hydraulic anchor drilling rig is fully hydraulically controlled, and the hydraulic valve group is imported from Italy. It can carry out high-frequency impact and high-speed rotation, which can work stable, reliable and high efficiency. The back punching function is standard, which effectively solves the problem of drill sticking during the drilling process.

hydraulic drill

Features and Benefits

① It is especially suitable for construction under complex geological conditions (broken rock formation, loose rock-soil layer, etc.), such as clay, silty clay, especially the geology that is difficult to form holes such as soil interbedded with rocks, miscellaneous fill, and pebbles.
② Drilling methods are diversified. According to different geology, when constructing self-drilling bolts, rotary drilling or rotary percussion drilling is used.
③ Drilling and grouting are carried out simultaneously, and the grout effectively fills rock fissures. The diameter of the anchoring body is large and the anchoring effect is good.
④ The maximum lifting height is 3.3 meters, the construction work area is large, and multiple rows of holes can be drilled at one time.
⑤ Drilling, grouting, and anchoring can be completed at one time, which simplifies the construction steps, and the construction efficiency is 4-5 times that of steel bars, anchor cables, etc., thereby reducing the overall cost.

Excavator Rock Drill

Excavator rock drill is also called full hydraulic drilling excavator. It is modified by removing the bucket and connecting hydraulic rock drill using the excavator's built-in oil circuit of hammer. Its components include hydraulic rock drill, hydraulic control system, feed system and excavator platform. Excavator rock drill can be used for the installation of self drilling anchor bolts, combining drilling, grouting and anchoring functions together. It is widely used in slope engineering, tunnel engineering, ground and foundation engineering, hydraulic engineering, road bridge engineering, etc.,

excavator rock drill

Features and Benefits

① It can adapt to a variety of operating terrains, especially in complex working conditions such as large slopes, limited space and undulating terrain.
② It adopts hydraulic rock drill with large rotational torque, which can carry out high-frequency rapid impact and fully improve drilling efficiency. The drilling speed can reach 1m/min on the rock with hardness of 8-9 degrees, and the maximum can reach 2m/min.
③ With high-speed drilling capability, it can be applied to rock conditions above hardness of 7 degrees (such as solid sandstone, limestone, solid conglomerate, iron ore, granite, etc.).
④ Use with self drilling anchor bolts, combining drilling, grouting and anchoring functions together. It is especially suitable for construction conditions of weak surrounding rock, sand and pebble layer, stone soil, weathered rock and other easy collapse conditions.

High Slope Rock Drill

The high slope rock drill is mainly used for drilling support equipment for high slope anchoring projects for landslides and dangerous rock mass reinforcement in the prevention and control of geological disasters. It adopts a split structure and is mainly includes guide rails (including power heads) and hydraulic power stations and operating.It has the characteristics of simple structure, light weight, and easy handling and transportation.

high slope rock drill

Features and Benefits

① The construction site has strong adaptability, and the equipment is easy to move, transport, install and disassemble, especially suitable for construction on high slopes or narrow spaces where large equipment is difficult to enter and exit.
② Full hydraulic control, impact, rotation, advance and retreat are all driven by the hydraulic system, with high drilling force and low noise.
③ The drilling efficiency is high, combined with the self drilling anchor bolt construction technology, the functions of drilling, grouting and anchoring can be completed at one time.

Considerations for Equipment Selection

Selecting the appropriate self-drilling soil nailing equipment is pivotal for project success. Factors such as geological conditions, project scale, and space constraints should be meticulously evaluated. Additionally, considering the specific benefits of each equipment type can aid in aligning the chosen equipment with the project's unique requirements.

Maintenance and Safety Considerations

To ensure the longevity and safety of self-drilling soil nailing equipment, regular maintenance protocols must be established. This includes monitoring hydraulic systems, checking for wear and tear, and adhering to manufacturer-recommended service intervals. Furthermore, rigorous safety measures should be implemented, encompassing operator training, site-specific risk assessments, and adherence to industry safety standards.


In conclusion, the utilization of self-drilling soil nailing construction equipment offers unparalleled efficiency and versatility. The three highlighted types—Crawler Hydraulic Anchor Drilling Rig, Excavator Rock Drill, and High Slope Rock Drill—each brings unique advantages to the construction site, catering to diverse geological challenges.

Sinorock as a ground support expert is a trusted partner for construction professionals seeking reliable anchoring solutions. If you have any needs or questions in the field of geotechnical anchoring, please feel free to contact us at sinorock@sinorockco.com.

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