1. Definition and Function
The prestressed flat anchor clip for bridges stands as a pivotal component within the sophisticated prestressed system of modern bridge architecture. In these structures, prestressed steel strands are meticulously tensioned to pre-stabilize the framework. This vital process significantly boosts the bridge's load-bearing capabilities and enhances its resistance to cracking. The flat anchor clip, ingeniously engineered, comes into direct engagement with the steel strand. Utilizing the wedge principle, it ensures a secure, unwavering grip post-tensioning, thereby anchoring the steel strand firmly against the anchor plate to steadfastly maintain the essential prestress.
2. Structure and Principle
• Structure: The anchor clip boasts a distinctive conical frustum shape, tapering from a smaller upper section to a broader base. The clamp's interior is precision-crafted, often featuring threads or tapered threads to ensure a firm, intimate connection with the steel strand. The outer conical surface seamlessly aligns with the inner taper of the flat anchor plate. Some designs incorporate machining slots at the wider end, typically between 3-5mm deep. The narrower end integrates pin holes, arranged perpendicular to the clamp's outer wall, usually accommodating three strategically placed pins.
Principle: In the prestressing phase, the jack expertly applies tension to the steel strand. Upon achieving the desired tension, the clamp is driven inward, securing itself between the anchor plate's tapered hole and the steel strand due to the strand's retraction. This mechanism relies on the frictional synergy between the clamp and both the steel strand and the tapered anchor plate hole, ensuring the strand remains steadfastly anchored and the prestress reliably preserved.
3. Material and Performance Requirements
Material: Typically forged from robust alloy steel, these clips possess exceptional strength, unmatched hardness, and superior toughness. This ensures they remain resilient, resisting brittle fractures and significant deformation even under immense stress.
Performance requirements: These clips must deliver impeccable anchoring performance, ensuring the steadfast security of the steel strand without the risk of slipping or loosening. They exhibit admirable anti-fatigue properties, adeptly enduring the rigorous demands of bridge environments under repetitive vehicular and other loads. Additionally, they feature a degree of corrosion resistance, significantly extending their operational lifespan.
4. Application Scenarios
Primarily employed in slab structure bridges, these flat anchor clips are indispensable when prestressed steel strands must be arranged flatly to avoid excessively increasing plate thickness due to cable positioning. They prove particularly valuable for bridge decks on urban elevated highways, small prestressed concrete slab bridges, and similar structures.
5. Key Points of Construction
Pre-installation inspection: Conduct a thorough examination of the clip's surface quality, ensuring it is devoid of any defects like cracks or burrs. Verify the seamless fit between the clip and the tapered anchor plate hole for a smooth, snug engagement.
Installation process: Carefully position the clip within the anchor plate's tapered hole, ensuring it is evenly situated and maintains optimal contact with the steel strand for maximum effectiveness.
• Tensioning operation: Adhere rigorously to the meticulously designed tensioning protocols and processes. Throughout the tensioning, remain vigilant for clamp alignment issues or jamming. Post-tensioning, meticulously verify the anchorage of the clips to confirm the unwavering security of the steel strands.
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