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
-
- How To Support The Tunnel Pass Through Cobble Layer? Self-drilling Anchor Bolt Support Method
- Time:2023-02-25From:This Site
- How to support the tunnel pass through cobble layer? Self-drilling anchor bolts can be used for support. It can solve the construction problems encountered when the tunnel passes through the cobble layer by drilling preparation, drilling and grouting, coupling the anchor bars, and pull-out test.
- View details
-
- What Is Soil Nailing?Stabilization of Slope in Loose Soil Using Soil Nails
- Time:2023-02-22From:This Site
- soil nailing system repair unstable natural slope, or build a new or existing ultra-steep slope with closely spaced steel inclusions. self drilling anchor bolts used as soil nails are widely used slope stabilization.
- View details
-
- 3 Types of Self Drilling Soil Nailing Construction Equipment
- Time:2023-02-18From:This Site
- In the traditional sense, steel bars are often used as soil nails, so the supporting construction equipment is relatively mature. So what construction equipment is there for self-drilling soil nailing? Next, Sinorock will introduce the equipment used for self-drilling anchor bolts as soil nails.
- View details
-
- Quality Control, the Vital Factor of A SDA Bolt Factory
- Time:2022-07-22From:This Site
- The self-drilling rock bolts are applied to support the tunnels, reinforce the foundations, and stabilize the slopes that are in bad conditions. The constructio
- View details
-
- Spring Day Celebrations
- Time:2021-04-30From:This Site
- In this spring season, do everything that makes us happy. In any case, we should enjoy life.
- View details
-
- A Meaningful Christmas Day - Decorating Christmas Tree with Colleagues
- Time:2020-12-25From:This Site
- The Christmas party is a staple of office life-a way for teammates to socialize in a non-work setting. We had a pleasant and meaningful day. We decorated the Christmas tree together.
- View details
-
- SINOROCK Will Attend CONEXPO-CON/AGG 2023
- Time:2023-02-14From:This Site
- CONEXPO-CON/AGG 2023 will be held during 3/14-3/18 2023. Sinorock will attend with our proud products self-drilling achor bolt system and other anchoring products. Welcome to visit!
- View details
-
- Sinorock is attending Philconstruct Manila 2022
- Time:2022-10-19From:This Site
- Philconstruct Manila 2022 will be held during 11/03-11/06 2022. Sinoroc will attend with our proud products self-drilling achor bolt system and other anchoring products. Welcome to visit!
- View details
-
- Sinorock Will Attend 2022 Bauma CTT Russia Expo Trade Fair in Mosco
- Time:2022-05-12From:This Site
- Sinorock will attend the 22nd Bauma CTT Russia Expo on May 24-27, 2022. Check the detail information below: Booth Number: Exhibition Hall 13, 528Address: Crucos
- View details