1. Definition and Function
The prestressed flat anchor clip for bridges is a pivotal anchoring component within the sophisticated prestressed system of bridges. Within these structures, the tensioning of prestressed steel strands pre-loads the architecture, thereby dramatically boosting both the load-bearing capacity and the crack resistance of the bridge. This indispensable clip, in direct contact with the steel strand, utilizes the ingenious wedge principle to tightly clasp the strand post-tensioning, anchoring it firmly to the anchor plate and thereby ensuring the continuation of the essential prestress.
2. Structure and Principle
• Structure: Impeccably crafted in the geometric elegance of a conical frustum, this clip features a smaller upper portion and an expansive lower section. The inner cavity of the clamp, meticulously machined into specific shapes such as threads or tapered threads, ensures an unyielding engagement with the steel strand. Its outer conical surface is seamlessly matched with the inner conical hole of the flat anchor plate. Some designs boast machining slots at the broad end, their depth typically ranging from 3-5mm. The smaller end is equipped with pin holes, smartly positioned inside and perpendicular to the clamp's exterior wall, generally incorporating three pins.
Principle: Throughout the prestressing process, the jack imparts tension upon the steel strand. Upon achieving the design tension, the clamp is expertly wedged inward between the tapered hole in the anchor plate and the steel strand due to the strand's retraction. The robust frictional forces between the clamp and the steel strand, coupled with those between the clamp and the tapered hole in the anchor plate, ensure the steadfast anchoring of the steel strand and the maintenance of vital prestressing.
3. Material and performance requirements
Material: Crafted from high-grade alloy steel, the clip boasts impressive strength, exceptional hardness, and remarkable toughness, all ensuring resilience against brittle fractures and excessive deformation under immense stress.
Performance requirements: Demonstrates unwavering anchoring prowess, ensuring the steel strand remains secure without the slightest slip or loosening. It exhibits outstanding anti-fatigue capabilities, adeptly adapting to the dynamic working environment of bridges subjected to repeated vehicular and other loads. Additionally, the clip possesses a certain degree of corrosion resistance, effectively prolonging its operational longevity.
4. Application scenarios
Predominantly deployed in slab structure bridges, these clips become indispensable when prestressed steel strands must be arranged flatly to prevent the increase in plate thickness due to cable setup. Essential in scenarios such as urban elevated bridge decks, small prestressed concrete slab bridges, and additional structural configurations.
5. Key points of construction
Pre installation inspection: Undertake a meticulous assessment of the clip's surface quality to confirm the absence of any defects like cracks or burrs. Scrutinize the fit between the clip and the tapered hole in the anchor plate to ensure a smooth, tight amalgamation.
Installation process: Precisely position the clip into the tapered hole of the anchor plate, guaranteeing an even distribution and optimal contact with the steel strand.
• Tensioning operation: Execute in strict accordance with the meticulously designed tensioning program and process. During this crucial phase, diligently monitor the clamp's follow-through to avert issues such as misalignment and jamming. Post-tensioning, conduct a thorough check of the clamp anchoring to ensure the steel strands are securely and reliably anchored.
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