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一、What is a fault zone?

After the rock layer or rock mass is damaged by force, the rock blocks on both sides of the fracture undergo significant displacement. This fracture structure is called a fault. Generally speaking, the larger the fault, the wider the fracture zone and the more complex the structure. The rock formations in the fracture zone are broken and have little resistance to weathering and erosion. Therefore, the terrain along the distribution direction of the fracture zone is generally low-lying, and there are often rivers and valleys.

二、Application of hollow anchors in fault zones

(1) Meaning: 

Hollow anchor, also known as self-drilling hollow grouting anchor, consists of anchor rod, anchor coupling, anchor nut, drill bit, pallet, etc. It is an anchoring system mainly used for excavation support in fault fracture zones. It replaces ordinary mortar anchors under complex geological conditions and overcomes the problems of ordinary mortar anchors such as hole collapse, inability to insert rods, and insufficient grouting. It plays the role of anchor support and improves the load-bearing capacity of surrounding rocks. Ability to ensure the overall stability of the surrounding rock and has good application value.

(2) Advantages:

1. Simple organizational structure: The structure of the hollow anchor is simple and clear, with simple assembly steps, easy operation and easy construction.

2. Strong tensile strength: The inner core of the hollow anchor is made of steel bars and has high tensile strength.

3. Good corrosion resistance: Since the shell of the hollow anchor is usually made of steel pipe or fiberglass, it has good corrosion resistance.

4. Long service life: The hollow anchor adopts high-quality materials and manufacturing processes, so it has a long service life.

5. Safe and reliable: The hollow anchor rod has a solid structure and is safe and reliable to use, which can effectively prevent falling or breaking.

(3) Application:

1. Preparation before construction: Check whether the drilling rig functions normally, whether the drill bit and hollow anchor are broken, and whether the hollow anchor is not damaged. After confirming that there is no problem, rotate the hollow anchor and use it with the drill bit;

2. Drilling grouting: During the drilling process, grouting is performed by rotating the grouting joint, and the hollow anchor rod and grouting pipe are connected to the drilling rig so that drilling and grouting are completed at the same time;

3. Hollow anchor lengthening: If the length of a single self-drilling anchor does not reach the designed drilling depth, it can be connected with a coupler to meet the design requirements;

4. Install plates and nuts: After grouting is completed, install plates and nuts on the parts of the self-drilling hollow anchor exposed to the construction surface to ensure the anchoring effect.

Fault zones pose significant challenges to construction projects and require proactive measures to ensure the safety and longevity of building structures. Hebei Jiufu provides reliable and efficient anchoring solutions for complex strata, allowing self-drilling anchors to achieve better anchoring effects.