3 Factors That Affect the Ultimate Load of Self Drilling Hollow Grouting Bolts
Time:2022-06-07From:sinorock View:
Due to the high ultimate load and yield load of the self-drilling hollow rock bolt, it is more and more commonly used in geotechnical anchoring projects, such as in railway tunnel advanced support, railway slope protection, highway tunnel advanced support, slope reinforcement, mining support, water conservancy projects, dam reinforcement, high-rise building foundations, and foundation support. So what is the anti-pull principle of self-drilling hollow grouting bolt? What are the influencing factors of the ultimate load of self-drilling rock anchors?
How Do self-drilling hollow grouting bolts Support?
The self-drilling hollow grouting bolt is drilled into the rock mass through a special drilling rig for rock bolts or other available equipment, and then the grout is injected into the drilling hole and rock mass fissure through the grouting machine. The hollow grouting anchor rod and the broken rock mass around the rod body together form an anchor body with an irregular surface, so as to play an anchoring effect. When the self-drilling hollow grouting bolt is stressed, the gripping force between itself and the surrounding cement mortar is transmitted to the mortar, and then transmitted to the surrounding rock mass. The self-drilling hollow bolt provides the anchoring force through the mutual friction between the rod body, the mortar, and the surrounding rock mass. That’s where the ultimate load comes from.
Factors Affecting Ultimate Load of Self-Drilling Hollow Grouting Bolts
The diameter of the anchor and the length of the anchor segment
The ultimate load of the self-drilling hollow grouting bolt is proportional to the diameter of the anchor rod and the length of the anchoring section. The larger the diameter of the anchor and the longer the length of the anchoring section (drilling depth), the greater the ultimate load is.
Shear strength of current geological rock mass
In the case of good construction technology, the ultimate load of self-drilling hollow grouting bolts is mainly closely related to the shear strength of rock and soil. Due to the large difference in shear strength of different rock and soil masses, the impact on the ultimate load of self-drilling hollow bolts is also large. In engineering design, the drilling angle and depth need to be carefully studied in order to improve the pullout resistance.
Grouting pressure
When the self-drilling hollow grouting bolt is grouting, the greater the pressure, the more the grout can penetrate into the cracks of the rock mass around the drilling hole to improve its original mechanical properties, increase the diameter of the anchor body and increase the diameter of the anchor body and the surrounding rock mass. The friction force of the self-drilling rock bolts is increased, thereby increasing the ultimate load. However, this factor is not without limitations. Tests have shown that when the grouting pressure exceeds 4Mpa, the impact on the pullout resistance of the self-drilling hollow grouting bolt becomes very small.
The factors affecting the ultimate load of the self-drilling hollow grouting bolt above are all discussed under the premise that the bolt diameter and wall thickness are the same. If the diameter and wall thickness becomes larger, the corresponding pull-out force will naturally be larger than that of the smaller ones.
Before designing and using self-drilling hollow grouting bolts, it is necessary to conduct a comprehensive and detailed survey of the geological conditions of the project, so that a more realistic plan can be designed and the quality of the project will be higher.
latest news
-
- 5 common quality problems in construction of self-drilling hollow bolt (SDA system)
- Time:2024-07-30From:This Site
- As a very effective support method, self-drilling hollow anchors have been widely used in rock and soil anchor support system in recent years. Self-drilling hollow anchors not only maintains the stability of soil and rock mass during construction, but also plays an important role as a part of permanent support structure after construction, so it is very important to ensure the construction quality of self-drilling hollow bolt.
- View details
-
- Hollow Grouting Anchor Bars in Tunnels: Unveiling Neglected Quality Concerns
- Time:2024-07-24From:This Site
- Tunnel construction demands a delicate equilibrium between innovation, safety, and structural integrity. Amidst this intricate balance, self-drilling hollow grouting anchor bars emerge as crucial support structures, both for maintaining rock stability during construction and as enduring components of the permanent support system post-construction.
- View details
-
- The Introduction of Rock Bolts Application and Types
- Time:2024-07-11From:This Site
- Bolt support is widely used in underground caverns, tunnel support projects and high slope treatment projects. The bolt support generally uses cement mortar, ch
- View details
-
- International Women's Day with Strawberry-picking
- Time:2024-03-09From:This Site
- Marked the annual observance of International Women's Day, and to commemorate this significant event, Sinorock organized a special strawberry-picking event exclusively for its female employees.
- View details
-
- Celebrate the 74th anniversary of the founding of the People's Republic of China
- Time:2023-10-01From:This Site
- On October 1st every year, we observe the annual National Day, commemorating the birth of our beloved motherland.
- View details
-
- Happy Mid-Autumn Festival!
- Time:2023-09-29From:This Site
- The Mid-Autumn Festival which also known as the Mooncake Festival. This annual festival falls on the fifteenth day of the eighth month of the lunar calendar and is called the Mid-Autumn Festival because it falls in the middle of the three months of autumn.
- View details
-
- SINOROCK Gears Up for UGOL ROSSII & MINING 2024 with Custom Mining Solutions
- Time:2024-05-15From:This Site
- SINOROCK is thrilled to announce its participation in the highly anticipated 32nd International Trade Fair for Mining Technology, UGOL ROSSII & MINING 2024. The event will take place at the Exhibition complex "Kuzbass Fair" in Novokuznetsk, Kemerovo region - Kuzbass, Russia, from June 4th to 7th, 2024.
- View details
-
- SINOROCK Set to Showcase Anchoring Solutions at MINING & CONSTRUCTION VIETNAM 2024
- Time:2024-03-27From:This Site
- HANOI, VIETNAM —SINOROCK is thrilled to announce its participation in the upcoming MINING & CONSTRUCTION VIETNAM 2024 exhibition, scheduled to take place at the National Exhibition Construction Center (NECC) in Hanoi from April 24 to 26, 2024. The SINOROCK team will be stationed at Booth No. A57, is ready to engage with industry professionals, showcase our most popular anchoring products, and explore collaborative opportunities.
- View details
-
- Sinorock is gearing up for The Mining Show 2023 in Dubai!
- Time:2023-10-25From:This Site
- Sinorock is preparing for an exciting adventure at The Mining Show 2023 in Dubai! Come visit us at Booth J64 on November 21-22 to discover our exceptional mining solutions and immerse yourself in the cutting-edge developments of the industry.
- View details