Internal Clamping Device for Hollow Profile Stiffening
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Solution Overview
Problem
Hollow profiles in large-scale frame constructions face challenges in absorbing loads due to insufficient cross-section values, leading to deformation issues, and existing stiffening methods either require high assembly effort or result in bulky constructions, with no option for subsequent adjustment of prestressing.
Innovation Solution
A clamping device with wedge-shaped intermeshing elements inside the hollow profile allows for external screw tensioning, enabling subsequent prestressing adjustments without altering the external appearance, using a tensioning screw and adjustable wedge elements to apply tensile stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel profiles with high dead weight are used to achieve sufficient resistance moments, then the structural strength is improved, but the load problem increases due to the additional weight
Solution Approach 1:
The invention combines aluminum hollow profile with internal steel reinforcement elements. The aluminum profile provides corrosion resistance and aesthetic appearance, while the internal steel tension elements provide the necessary structural strength. This composite construction allows achieving sufficient resistance moments without using solid steel profiles, thereby reducing the overall dead weight compared to full steel construction.
2Strength
If insertion profiles are used to achieve necessary rigidity, then the structural strength is improved, but the assembly complexity increases
Solution Approach 1:
The invention integrates the stiffening function directly into the hollow profile by placing tension elements inside the profile cavity. This merges the profile structure with the reinforcement system, eliminating the need for separate insertion profiles or external bracing devices. The tension elements are anchored at both ends within the profile, creating a unified structural unit that simplifies assembly compared to multi-component insertion systems.
3Strength
If framework-like bracing devices are attached behind the profile, then the structural strength is improved, but the visual appearance deteriorates due to bulky construction
Solution Approach 1:
The invention nests the tension elements and clamping devices inside the hollow profile cavity. The reinforcing elements are concealed within the profile's internal space, similar to nested dolls, so that the external appearance of the profile remains clean and uncluttered. This eliminates the visual bulkiness of external bracing while maintaining the structural stiffening function through the internal tension members.
4Force
If screws are located at the ends of the clamping device inside the hollow profile, then the clamping force can be applied, but subsequent adjustment becomes impossible due to inaccessibility
Solution Approach 1:
The invention introduces an intermediary mechanism - a tensioning element with external adjustment capability. The tensioning element transfers the adjustment force from the externally accessible region to the internal clamping screws. By operating the tensioning element from outside the hollow profile, one can indirectly adjust the clamping force of the internal screws without direct access to them, thereby maintaining both effective clamping and subsequent adjustability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for individual prestressing adjustments to meet expected loads, maintaining deformation within regulatory limits while maintaining the frame's appearance, and can be retrofitted into existing structures, effectively managing loads such as glass, wind, and snow.
Implementation Method 1
the tensile stress is applied by wedge-shaped intermeshing clamping elements, which are clamped via a screw connection arranged outside of the hollow profile
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A clamping device for stiffening hollow profiles, particularly for large-area frame structures, is shown and described, and its use is described. The clamping device is to be arranged inside a hollow profile (1) and is intended to allow prestressing of the profile, which counteracts the expected loads acting on the hollow profile and stiffens the profile in such a way that the deformation of the profiles within the frame remains within the limits permitted by regulations and does not affect the external appearance of the frame structure. For this purpose, at least one tension element (3) is arranged inside the hollow profile and connected at its ends (4) to the ends of the hollow profile in such a way that a tensile force is exerted on the tension element (3).The prestressing itself is applied by carrying out a static preliminary design for a specific profile taking into account the known static loads, the calculation of the theoretical load-dependent deflection and the prestressing of the hollow profile to a specific value (d) to avoid excessive deflection in the installed state.