Self Drilling Anchor Bolt VS Long Pipe Shed, Which Is Better to Support the Tunnel?
Time:2022-03-07From:sinorock View:
In recent years, as a new type of support system, self-drilling anchor bolts have been more and more widely used in various geotechnical anchoring projects. For a long time, long pipe shed support has been the preferred solution in tunnel support projects. However, as more and more tunnel support projects become more and more difficult, it seems difficult for long pipe sheds to meet the increasingly complex geological conditions, especially for geological conditions such as soft and broken surrounding rocks and strongly weathered rocks. The support scheme is difficult to construct, so there are more and more construction cases of self-drilling anchor bolts as tunnel support pipe sheds.
Self-drilling anchor bolt, also called self-drilling rock bolt, self-drilling hollow bar, or sda bolt, contains a hollow bar, a drill bit, a coupler, a plate, a nut, and a centralizer. There are two types of hollow bars, R thread and T thread. And various drill bits are available according to the different conditions. There are several features that help to make self-drilling anchor bolt of our most reliable solutions, the most notable being the 'all-in-one' tool, or simultaneous grouting.
So, self-drilling rock bolt support or long pipe shed support, which is the best choice for tunnel advanced support? Below, we compare the advantages and disadvantages of self-drilling bolt support and long pipe shed support from the construction process.


Self-drilling bolt construction process
1) Before construction, check whether the hollow bolt body and related accessories and rock drilling and grouting machinery are normal, and after ensuring that they are normal, connect the rock drilling equipment to the self-drilling bolt correctly;
2) Determine the drilling position and drilling angle;
3) Start the drilling construction according to the predetermined position and angle, rinse the inner hole of the self-drilling anchor rod with water, then connect the rotary grouting adapter to the end of the anchor rod, and grouting while drilling, if a single self-drilling anchor rod The length cannot meet the design requirements, and the length of the connection socket can be used;
4) After drilling to the design depth, the drilling rig can be operated to make the self-drilling anchor rod go up and down and reciprocate to ensure that the thickness of the slurry around the drill rod is uniform;
5) Finally install the backing plate and nut.

Long tube shed construction process
1) Use reinforced concrete arch to make the guide wall of long tube shed;
2) Accurately measure the plane position, inclination angle and extrapolation angle of the orifice tube and number them one by one;
3) Use the electric drilling rig to drill according to the predetermined position. During the drilling process, ensure that the drilling elevation angle is between 1° and 1.5°, and the maximum subsidence and left and right offset of the drilling rig do not exceed 1% of the length of the steel pipe;
4) After drilling a hole, pull out the drill pipe, and then push into a steel pipe. During drilling, the deflection should be measured in real time. If it exceeds the design requirements, the deflection should be corrected in time;
5) Connect the hollow steel pipe to the grouting pump for grouting; before grouting, the grouting field test should be carried out, and the grouting parameters should be determined according to the actual situation according to the test to ensure that the slurry diffusion radius is not less than 0.5 meters.
From the construction process of the above two construction schemes, we can clearly see that the construction process of the long pipe shed is much more complicated and more difficult than the self-drilling bolt. Moreover, in the case of loose geological engineering, the long pipe shed support cannot be formed into holes, and only self-drilling anchor bolts can be used for construction.
Self-drilling anchor bolts have many other advantages as a tunnel advance support pipe shed.
The length of the self-drilling bolt is easier to adjust: it can be cut off at any position or lengthened by connecting sockets, and it has good sealing performance and will not leak slurry;
Self-drilling anchor bolts can be applied to most geological structures, especially weak, broken and other difficult pore-forming geology, such as fault fracture zone, weathered rock, gravel soil stratum, sand and pebble stratum, etc.;
The construction method of self-drilling anchor bolts is simple: when drilling and construction in different geology, the installation methods and construction methods of self-drilling anchor bolts are almost the same and do not require professional technicians;
Self-drilling anchor bolts have high construction efficiency: self-drilling anchor bolts use the bolts as drill pipes and grouting pipes, which will not be retracted after drilling into the stratum, reducing construction procedures, improving construction efficiency and shortening construction period.
So, it is apparently we can see that the self-drilling anchor bolt is much better than a pipe shed when supporting the tunnel.
latest news
-
- What Are the Applications of SDA Bolts in Hydropower Stations?
- Time:2025-08-21From:This Site
- Learn how self-drilling anchor bolts enhance slope stability, tunnel support, and dam reinforcement in complex geological conditions at hydropower stations. Optimize hydropower projects with efficient, cost-effective, and eco-friendly solutions.
- View details
-
- Slope Stabilization with SDA Bolts: Benefits & Applications
- Time:2025-08-19From:This Site
- Discover how self-drilling anchor bolts (SDA bolts) provide superior slope stabilization for highways, railways, and tunnels. Learn their key benefits, installation process, and real-world applications in loose or collapsible soils.
- View details
-
- How Self-Drilling Rock Bolts Enhance Tunnel Support in Fractured Rock?
- Time:2025-08-15From:This Site
- Discover how self-drilling rock bolts enhance tunnel support in fractured rock. Learn their benefits, installation steps, and real-world applications for safe, efficient tunneling.
- View details
-
- Sinorock 2025 Quality Month | Strengthening Quality Foundations, Empowering Product Excellence
- Time:2025-08-13From:This Site
- Sinorock’s 2025 Quality Month, themed “Strengthening Quality Foundations, Empowering Product Excellence,” successfully concluded, reinforcing our commitment to superior product quality.
- View details
-
- Sinorock Safety Month 2025 | Everyone Speaks Safety, Everyone Can Respond
- Time:2025-07-03From:This Site
- Sinorock Safety Month 2025, centered on the theme "Everyone Speaks Safety, Everyone Can Respond - Spot Workplace Hazards," has wrapped up successfully!
- View details
-
- Quality Control: the Vital Factor of A SDA Bolt Factory
- Time:2025-01-09From:This Site
- Sinorock’s comprehensive quality control system, from supplier management to outgoing inspections, ensuring the highest standards for self-drilling anchor bolts in construction.
- View details
-
- Sinorock Invites You to Explore Proven Self-Drilling Anchor Bolt Solutions at bauma 2025
- Time:2025-03-07From:This Site
- From April 7–13, 2025, explore Sinorock’s Self-drilling anchor bolt solution at Booth C2.513/4 in Hall C2 of the Messe München Exhibition Center (Munich, Germany).
- View details
-
- SINOROCK to Attend EXPOMINA PERÚ 2024 in Lima, Peru
- Time:2024-08-10From:This Site
- Sinorock to Attend EXPOMINA PERÚ 2024 in Lima, Peru
- View details
-
- SINOROCK to Participate in MINING AND METALS CENTRAL ASIA 2024
- Time:2024-08-08From:This Site
- SINOROCK to Participate in MINING AND METALS CENTRAL ASIA 2024
- View details