Positioning Aid for Wind Turbine Concrete Foundation Core Elements
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Solution Overview
Problem
Existing methods for producing concrete foundations for wind power towers prestressed with tendons face challenges in accurately aligning tendon ducts, leading to kinking and damage, particularly at transition points, and require complex funnel-shaped widening of cladding tubes.
Innovation Solution
A positioning aid with an adapter device and reference sections is used to precisely position core elements in the formwork, allowing for one-piece cladding tubes with a constant cross section to be used, eliminating the need for funnel-shaped widening and reducing assembly errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If core elements are positioned without a positioning aid, then the positioning process is simpler, but the alignment precision of core elements deteriorates, leading to tendon buckling and damage
Solution Approach 1:
A positioning aid is introduced as an intermediary device between the formwork and the core elements. The positioning aid includes reference sections that interface with the formwork and adapter devices that interface with the core elements, mediating the positioning process to achieve high precision alignment without requiring direct complex positioning mechanisms on each core element
Solution Approach 2:
The positioning aid is designed to automatically establish precise positioning when its reference sections are placed on the formwork. The adapter device self-aligns with the core element, and the system uses the formwork itself as a reference surface, allowing the positioning aid to serve itself in establishing the precise geometric relationships needed for accurate core element placement
2Reliability
If funnel-shaped expansions are added to ducts to prevent buckling, then tendon reliability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The positioning aid establishes precise alignment of the duct before the tendon is installed. By pre-positioning the core element with high accuracy using the positioning aid and reference sections, the need for subsequent buckling-prevention features like funnel-shaped expansions is eliminated, as the tendon is guided accurately throughout its entire length from the start
3Adaptability or versatility
If multiple separate components are used for positioning, then adaptability improves, but assembly complexity and time increase
Solution Approach 1:
The positioning aid combines multiple functions into a single integrated device: it includes reference sections for interfacing with the formwork, positioning surfaces for establishing precise locations, and adapter devices for securing the core elements. This merged design eliminates the need for multiple separate positioning components, reducing assembly steps and time while maintaining the adaptability to position different types of core elements
Data Source
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Figure 5a~5b
AI summary
In a method for producing a concrete foundation for a wind power tower externally preloaded and made of precast concrete parts, a formwork for the concrete foundation is erected, core elements for producing passage openings in the concrete foundation for the loading elements are positioned and fixed on the formwork, and the concrete foundation is cast. A measurement reference system is established in order to position the core elements, at least one first positioning aid having an adapter device for a core element and having at least one reference segment is provided on the formwork. A corresponding concrete foundation is produced in accordance with the described method. A positioning device for orienting core elements in a concrete foundation comprises at least one first positioning aid, which has an adapter device for a core element and at least one reference segment for calibrating the first positioning aid.