Prestressing Cable Parallel Strand Segmentation
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Solution Overview
Problem
Existing prestressing cable systems require complex assembly at construction sites, leading to increased costs and errors due to unfavorable spatial conditions, necessitating a solution for easier assembly and transportation of pre-assembled cables.
Innovation Solution
The prestressing cable is composed of multiple parallel strands with spread-out end wires anchored in connection elements, allowing for pre-assembly in a controlled environment, with options for compression, plastic coating, and bundling with stainless steel or plastic strips to enhance anchoring and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single multi-layered stranded spiral wire cable is used, then the cable can be assembled in a compact form, but the E-modulus is reduced and vibrational load properties are poor
Solution Approach 1:
The cable is divided into multiple independent parallel strands instead of a single multi-layered spiral construction. Each strand consists of parallel wires that maintain straight geometry, avoiding the spiral deformation that reduces E-modulus. This segmentation allows each strand to independently bear load with optimal stiffness characteristics.
2Reliability
If complex wedge end connections are assembled at the construction site, then the prestressing force can be applied, but the assembly process is complex and error-prone due to unfavorable spatial conditions
Solution Approach 1:
The connection elements are pre-assembled with the cable strands in a controlled factory environment before transportation to the construction site. This preliminary assembly allows for precise positioning and proper installation of wedge connections under optimal conditions, eliminating the complexity of on-site assembly in constrained spatial conditions.
Solution Approach 2:
The cable strands and connection elements are combined into a single pre-assembled unit. This merging of components into a ready-to-install assembly simplifies the construction process by reducing the number of separate assembly steps required at the construction site.
3Reliability
If wires are spread apart and anchored in connection elements, then the anchoring depth is increased and reliability is improved, but the device complexity increases
Solution Approach 1:
The connection elements feature a localized funnel-shaped opening that gradually widens to accommodate the spread-apart wires. This local geometric modification provides the necessary anchoring volume and wire separation space without requiring complex overall structure changes. The funnel shape naturally guides wire placement and achieves deep anchoring with simple form.
Data Source
AI summary
A prestressing cable, in particular for static structures, that includes a longitudinal element and connection elements at the end faces of the longitudinal element. The longitudinal element has stranded wires, the end faces of which are anchored into the connection elements. The prestressing cable includes approximately parallel strands, each of which has stranded wires. The wires are spread apart at their end faces in the funnel-shaped opening of the respective connection element and anchored by a casting process, wherein the frustum-shaped funnel widens away from the strands.