Anchorless Rail Hook Section Concrete Retention
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Solution Overview
Problem
Existing rail arrangements without anchors face challenges in securing themselves within concrete when subjected to tensile stress, as the hook section may not be adequately surrounded by concrete, leading to reduced retention forces.
Innovation Solution
The rail arrangement features a free space between the hook section and the filling body that protrudes into an imaginary cuboid, allowing sufficient concrete penetration and ensuring the hook section is surrounded by concrete on both sides, with the free space being at least 1.5 times the distance between the hook section and the imaginary cuboid, and the hook section being inclined to form an undercut for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail arrangement is cast in concrete with a filling body in the receiving space, then the rail can be securely held in the concrete, but the hook section may not be adequately surrounded by concrete when subjected to tensile stress, leading to reduced retention forces
Solution Approach 1:
The receiving space is divided into two functional zones: a first receiving space for the filling body and a second receiving space for concrete. This segmentation allows the filling body to provide initial anchoring while the concrete in the second space provides additional surrounding and retention strength, resolving the contradiction between securing the rail and maintaining adequate concrete thickness around the hook section under tensile stress
Solution Approach 2:
The filling body acts as an intermediary element between the rail and the concrete. It is arranged in the first receiving space and allows the hook section to protrude into the second receiving space, enabling the filling body to transfer loads while maintaining proper concrete coverage around the hook section, thus resolving the retention force contradiction
2Reliability
If the free space between the hook section and filling body is increased to allow concrete penetration, then the hook section is securely surrounded by concrete, but the rail arrangement complexity increases
Solution Approach 1:
The free space is localized specifically in the region where the hook section protrudes into the second receiving space, rather than throughout the entire receiving space. This localized approach ensures adequate concrete penetration and surrounding of the hook section while minimizing the overall volume of free space, thus resolving the contradiction between concrete penetration reliability and device complexity
Solution Approach 2:
The hook section is designed to protrude in a specific dimensional direction into the second receiving space, creating a controlled three-dimensional arrangement. This dimensional positioning ensures the free space is optimally located for concrete penetration while maintaining a simple overall structure, resolving the contradiction between penetration reliability and structural complexity
Data Source
Figure 1
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AI summary
The invention relates to a rail arrangement, in particular for embedding in a concrete component, comprising an anchorless rail (10) and a filler element (30, 51, 52, 53, 54, 55, 56). The rail (10) comprises two side walls (11, 12) and a base (13) extending in a longitudinal direction (100) of the rail (10). The side walls (11, 12) and the base (13) have inner surfaces (14, 15) which together define a receiving space (17). The filler element (30, 51, 52, 53, 54, 55, 56) is arranged in the receiving space (17) and rests against the inner surface (16) of the base (13). At least one of the two side walls (11, 12) has a hook section (18, 19) that is inclined in direction (80) from the inside (16) of the base (13) towards the fill body (30, 51, 52, 53, 54, 55, 56) from a central plane (50). A fill body height (F) corresponds to 60% to 110% of the receiving chamber height (H).A free space (R1, R2, R1', R2') is formed between the filler body (30, 51, 52, 53, 54, 55, 56) and the hook section (18, 19). The free space (R1, R2, R1', R2') extends over at least 50% of the height of the hook section (18, 19) measured parallel to the median plane (50). An imaginary cuboid (60, 61) extends in the receiving space (17) from the side wall (11, 12) associated with the hook section (18, 19) to the median plane (50). A first side surface (62, 64) of the cuboid (60, 61) is formed by a portion of the inner surface (16) of the base (13). A second face (63, 65) of the cuboid (60, 61) is formed by a portion of the central plane (50). The imaginary cuboid (60, 61) extends over the entire height (H) of the recording space. The free space (R1, R2, R1', R2') projects into the imaginary cuboid (60, 61).