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Home > News > Industry Information > Reinforcing Soft Ground with Self-Drilling Anchor Bolts

Reinforcing Soft Ground with Self-Drilling Anchor Bolts


Ground is the foundation of building projects, it bears the weight of whole architectural structure, its construction quality directly relates to normal operation and quality problem. To ensure construction quality and use quality of building projects, it should start from foundation and reinforcement technology to enhance ground’s stability and quality, then promote healthy development of building career.

Understanding Soft Ground

Soft ground poses unique challenges in construction due to its inadequate strength and high compressibility. Common types of soft ground include clay, silt, and peat, each with distinct characteristics that impact construction. The loose nature of soft ground demands specialized reinforcement methods to enhance stability, bearing capacity, and reduce deformation and buried depth.

Introduction to Self-Drilling Anchor Bolts

Self-drilling anchor bolts stand out as a convenient solution in soft ground stabilization. These bolts integrate drilling, grouting, and anchoring in a seamless process, offering high construction efficiency and superior anchoring effects. Particularly effective in challenging strata like weathered rock and gravel layers, self-drilling hollow anchor bolts meet the technical requirements of construction, providing a viable alternative to conventional anchor bolts and cables.

large size of self drilling anchor bolt system

Advantages Over Traditional Anchoring Methods

One of the primary advantages of self-drilling hollow anchor bolts is their streamlined installation process. Unlike traditional anchor cables that involve labor-intensive steps, self-drilling bolts combine drilling, anchoring, and grouting into a single step, significantly reducing labor requirements and installation time. The full-length threaded surface enhances the bond between the mortar and the anchor, avoiding incomplete grouting issues.

Selecting the Appropriate Self-Drilling Anchor Bolts

Choosing the right self-drilling anchor bolts requires a thorough understanding of the available types and sizes. Factors such as soil conditions, deformations, and the stress force of self-drilling anchors must be considered. Engineers and designers can benefit from the design flexibility of self-drilling hollow anchor bolts, allowing for installation at various angles, depths, and orientations, optimizing load distribution and structural stability.

Installation Process

The installation process of self-drilling anchor bolts is a crucial aspect of their effectiveness. Here is a step-by-step guide:

1. Site Preparation: Clear the construction site and mark the locations for anchor bolt installation.
2. Drilling: Utilize the self-drilling feature to drill into the soft ground, eliminating the need for pre-drilled holes.
3. Grouting: Use a high-pressure pump to inject grout through the hollow channel of the anchor rods during drilling. This fills fissures and consolidates rock and soil layers.
4. Anchoring: The full-length threaded surface enhances the bond between the anchor and mortar, ensuring stability.
5. Completion: Unlike traditional methods, the anchor body does not need to be pulled out, preventing hole collapse. The equipment and tools required for installation include a self-drilling anchor rig, grouting equipment, and monitoring instruments.

Monitoring and Maintenance

Regular monitoring is crucial to ensuring the ongoing performance of self-drilling anchor bolts. Horizontal deformation, settlement, stress force, and soil pressure should be monitored based on project-specific needs. Inspections should be conducted at appropriate intervals, and any deviations from the expected performance should be addressed promptly.


When loading capacity of engineering structure is big and soil texture is loose (strength is not enough and compressibility is big), which cannot be used as natural ground, many reinforcement treatment methods are usually adopted, according to different situations, to improve ground property, enhance bearing capacity, increase stability and decrease ground deformation and buried depth. Self drilling hollow anchor is one of efficient methods to reinforce soft ground, through drilling, grouting and anchoring at the same time, it bonds hollow anchor to soft ground, which enhances integrality and has inhibitory effect on deformation and even collapse. Sinorock’s team has many years of experience in providing complete geotechnical engineering services. If you have any needs or questions about self-drilling anchor bolts, please feel free to contact us at