Polytunnel Stepped Support for Rotatable Beam Ventilation
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Solution Overview
Problem
The tension in ropes or straps securing polytunnel covers interferes with the rotation of vent beams, making it complex and time-consuming to adjust ventilation levels, especially when multiple structures are adjacent, leading to suboptimal growing conditions.
Innovation Solution
The polytunnel structure features cover support members with a stepped design, allowing rotatable beams to move with reduced resistance without needing to slacken the anchor ropes or straps, enabling easier adjustment of ventilation by positioning the anchor ropes or straps at a distance that minimizes resistance while maintaining the cover in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anchor ropes or straps are used to secure the cover member in position, then the cover member is firmly anchored, but the tension in the ropes or straps resists rotation and movement of the rotatable beam, making ventilation adjustment complex and time-consuming
Solution Approach 1:
The cover support member is divided into two distinct sections: a first section that contacts the rotatable beam and a second section that contacts the anchor rope or strap. This segmentation allows the beam to rotate freely on the first section while the anchor provides stability through the second section, resolving the contradiction between secure anchoring and easy rotation.
Solution Approach 2:
The two-section design acts as an intermediary mechanism between the anchor rope and the rotatable beam. The first section mediates the rotational movement by providing a contact point that allows free rotation, while the second section mediates the anchoring function by providing a separate contact point for the tensioned rope, thus eliminating the direct conflict between anchoring tension and rotational ease.
2Reliability
If the rotatable beam is directly supported by the anchor rope or strap, then the cover member remains secured, but the tension creates high resistance to beam rotation, requiring frequent slackening of ropes to adjust ventilation
Solution Approach 1:
By segmenting the cover support member into two sections with different functions, the system eliminates the need to slacken anchor ropes for ventilation adjustment. The first section allows the beam to rotate freely for quick ventilation changes, while the second section maintains constant anchor tension for cover stability, thus eliminating time loss associated with repeated rope adjustment.
3Adaptability or versatility
If multiple polytunnel structures are located adjacent one another, then space utilization is improved, but accessing and adjusting the tension in anchor ropes becomes more complicated
Solution Approach 1:
The segmented design concentrates the operational interface for ventilation control at the first section where the beam contacts the support member. This allows ventilation adjustment to be performed locally at the beam position without requiring access to the anchor ropes themselves, making the system equally easy to operate whether structures are isolated or arranged side-by-side.
Solution Approach 2:
The two-section cover support member acts as an intermediary that decouples the ventilation control function from the anchor rope adjustment function. Operators can control ventilation by rotating the beam at the first section without needing to access or adjust the anchor ropes at the second section, eliminating the access difficulty problem in adjacent structure arrangements.
Data Source
AI summary
A polytunnel structure is described having a plurality of cover support members supported upon respective pairs of legs, a cover member supported by the cover support members, an edge of the cover member being secured to a rotatable beam, and an anchor rope, strap or the like extending over the cover member to anchor the cover member in position, wherein the cover support members are each shaped to define a step between a first section and a second section, wherein when the rotatable beam is supported upon the second section, the anchor rope, strap or the like provides a reduced resistance to movement thereof.