Anchoring self-anchoring reinforcement member for active protection screens

Abstract

The application discloses an anchor rod self-anchoring reinforcing component for active protection net, and relates to the technical field of civil engineering construction. The component comprises a ground anchor steel pipe (1), a steel plate card (2), a U-shaped spring sheet (3), a pin (4) and a U-shaped steel reinforcement ring (5). Through an adjustable mechanical anchoring system combined with a grouting technology, the resistance is doubled, the drilling depth is 2 m, the anchor rod length and the drilling depth are reduced by 50%, and the pullout resistance is greater than or equal to 80 kN. The application has the advantages of high construction efficiency, low cost, high safety and environmental protection, and is suitable for stone side slope protection engineering.

Description

Technical Field

[0001] This invention relates to the field of civil engineering construction technology, specifically to a self-anchoring reinforcement component for active protection nets. It is applicable to highway and railway rock slope protection projects, achieving efficient anchoring through a mechanical self-locking structure combined with grouting technology, significantly reducing construction difficulty and safety risks. Background Technology

[0002] Traditional active protection netting systems use steel cables to cover slopes, anchoring them with steel cable anchors (2-4 m long) bonded to the entire length of drilled holes. This method has the following drawbacks: Low construction efficiency: The drilling depth needs to match the anchor bolt length (usually 4 m), manual drilling is time-consuming and has low hole formation efficiency; High safety risks: Deep hole construction in suspended working environments is prone to safety accidents; High cost: large amount of materials are used and high labor demand.

[0003] While some mechanical anchoring solutions exist in existing technologies, they generally suffer from problems such as complex structures, insufficient pull-out resistance (<60 kN), or non-adjustable expansion angles. Therefore, there is an urgent need for a new type of reinforcement component that combines efficient anchoring, rapid construction, and safety and reliability. Summary of the Invention

[0004] Purpose of the invention: To address the deficiencies of existing technologies, this invention provides a self-anchoring reinforcement component for active protective net steel pipe anchors. It achieves a doubling of resistance through an adjustable mechanical anchoring system combined with grouting technology, reduces the anchor length and drilling depth by 50% (from the traditional 4 m to 2 m), and achieves a pull-out force ≥80 kN, while reducing construction risks and costs. Technical solution

[0005] The present invention adopts the following technical solution: An active protection net anchor bolt self-anchoring reinforcement component includes: Ground anchor steel pipe (1): Q345 steel pipe with a length of 2m, an outer diameter of 42 mm and a wall thickness of 5.15 mm is used. The surface is sprayed with an epoxy zinc-rich anti-rust coating (thickness ≥50 μm), which has both lightweight and high bending resistance. Steel plate card (2): Four 8 mm thick 65Mn spring steel plates are symmetrically hinged to the end of the steel pipe. The edges of the card are designed to be serrated to enhance soil interlocking. U-shaped spring sheet (3): Two 65Mn steel U-shaped spring sheets, each 75mm long, 14mm wide, and 3mm thick, are installed between two cards to provide initial radial pretension (pretension range 5-10 kN). Pins (4): Two high-strength pins with a diameter of 12 mm are inserted through the end of the steel pipe and the hinge hole of the card to form an adjustable anchoring node. U-shaped steel bar ring (5): Q345 steel bar with a diameter of 16 mm, welded to the exposed position of the ground anchor steel pipe, and connected to the main cable of the active protection net.

[0006] Working principle: When the anchor rod is under tension, the ground anchor steel pipe (1) bears the axial tension, pushing the steel plate card (2) to expand outward along the hinge point of the pin (4). The pretension of the U-shaped spring plate (3) ensures the card's maximum opening and closing state, providing maximum tension after implantation. When the tension reaches the set threshold (≥20 kN), the card forms a wedge-shaped self-locking structure with the rock mass at a preset expansion angle α (15°-30°), achieving a doubling of pull-out resistance through the rock mass reaction force. Cement grout is injected through the grouting pipe, filling the gap between the anchor rod and the hole wall, further improving the overall anchoring performance. After grouting is completed, the grouting pipe is pulled out and reused. Attached Figure Description

[0007] Figure 1 : Structural diagram before installation, showing the assembly relationship of ground anchor steel pipe (1), steel plate clip (2), U-shaped spring sheet (3), pin (4), and U-shaped steel bar ring (5); Figure 2 3D structural diagram after installation Figure 3 : The installation status diagram shows that the steel plate card (2) expands to a 30° angle, and the serrated edge is embedded in the soil to form a wedge-shaped interlock; Figure 4 and 5 : The overall installation effect diagram of the retaining wall shows the connection method between the reinforcing components and the steel cable and the distribution of multiple anchor points, cement grout (6), highway (7). Detailed Implementation Example

[0008] Drilling: A lightweight anchor drilling machine was used to drill the hole, with a diameter of 50 mm and a depth of 2 m; Component assembly: Hinge the steel plate card (2) to the end of the ground anchor steel pipe (1) with the pin (4), insert the U-shaped spring plate (3) and adjust the preset expansion angle to 25°; Anchor bolt insertion: The ground anchor steel pipe (1) is manually inserted into the hole, ensuring the card is in an expanded state; Grouting: Cement grout is injected through the grouting pipe with a water-cement ratio of 0.4:1 and a grouting pressure of 0.5-1.5 MPa. The grout fills the gap between the anchor rod and the hole wall, enhancing the bond between the anchor rod and the soil. Quality inspection: The pull-out force is monitored in real time by an intelligent anchoring force tester. The steel cable is connected after the pull-out force meets the standard (≥80 kN).

[0009] Technical effect Improved construction efficiency: Drilling depth reduced by 50%, single-hole construction time shortened from the traditional 45 minutes to 20 minutes; Cost reduction: Steel wire rope usage is reduced by 50%, resulting in a 35% decrease in overall construction costs; Enhanced safety: Avoids suspended operations in deep holes, reducing the accident rate by 70%; Improved pull-out resistance: Through the dual action of mechanical self-locking and grouting, the pull-out force is ≥80 kN; Environmental advantages: Environmentally friendly grouting materials can be used, reducing environmental pollution.

Claims

1. Claim 1: A self-anchoring reinforcement component for active protection nets, characterized in that, It includes ground anchor steel pipe (1), steel plate card (2), U-shaped spring sheet (3), pin (4) and U-shaped steel bar ring (5); The ground anchor steel pipe (1) is a Q345 steel pipe with an outer diameter of 42 mm and a wall thickness of 5.15 mm, and the surface is sprayed with an epoxy zinc-rich anti-rust coating. The steel plate card (2) consists of four 8 mm thick 65Mn spring steel plates, symmetrically hinged to the end of the steel pipe, and the edge of the card is designed to be serrated. The U-shaped spring sheet (3) consists of two 65Mn steel U-shaped spring sheets, each 75mm long, 14mm wide, and 5mm thick, which are installed between the two cards to provide initial radial pretension. The pin (4) consists of two high-strength pins with a diameter of 12 mm, which penetrate the end of the steel pipe and the hinge hole of the card; The U-shaped steel bar ring (5) is a Q345 steel bar with a diameter of 16 mm, which is welded to the exposed position of the ground anchor steel pipe.

2. Claim 2: The anchor bolt self-anchoring reinforcement component according to claim 1, characterized in that, The preset expansion angle α of the steel plate card (2) is 15°-30°.

3. Claim 3: The anchor bolt self-anchoring reinforcement component according to claim 1, characterized in that, The pretension range of the U-shaped spring sheet (3) is 5-10 kN.

4. Claim 4: The anchor bolt self-anchoring reinforcement component according to claim 1, characterized in that, The pull-out force of the ground anchor steel pipe (1) is ≥80 kN.

5. Claim 5: The anchor bolt self-anchoring reinforcement component according to claim 1, characterized in that, The component is suitable for rock slope protection projects, with a drilling depth of 2 m and a hole diameter of 50 mm.

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