Transportable Barrier Cantilever Weld-Free Base Integration
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Solution Overview
Problem
Existing crowd barriers face issues with high bending moments and alternating bending stresses in the transition area between the barrier and the base plate, leading to potential weld failure and instability, especially when subjected to repeated flexing forces.
Innovation Solution
A transportable barrier design featuring a continuous cantilever with a lower leg that extends beyond the floor assembly and integrates seamlessly with the frame, eliminating weld joints in the high-stress area and distributing load primarily through the cantilever's cross-sectional contour, thus enhancing fatigue strength and reducing material weakening from welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If weld joints are used to connect the tubular arm to the base assembly, then the barrier can be assembled, but the welds are subjected to alternating bending stresses that can cause fatigue failure
Solution Approach 1:
The patent extracts the weld joint from the high-stress transition area by having the tubular arm pass through the base assembly without welding in that critical zone. The arm extends through openings in the base assembly and is welded only in areas away from maximum bending moments, removing the harmful weld-stress combination from the most critical location.
Solution Approach 2:
The base assembly acts as an intermediary element that the tubular arm passes through. Instead of directly welding the arm to the base assembly in the transition area, the arm penetrates the base assembly which provides structural support without requiring welds in the high-stress zone, thereby mediating the connection in a fatigue-resistant manner.
2Ease of manufacture
If the tubular arm end is compressed and flattened to simplify welding, then butt-welding becomes easier, but the weld influence zone weakens the material in the high-stress area
Solution Approach 1:
The patent removes the compressed/flattened end preparation from the high-stress transition area. The tubular arm maintains its circular cross-section as it passes through the base assembly, and welding is performed only in areas where the full circular section is present, eliminating the weakened zone from the critical location.
Solution Approach 2:
The patent applies different structural qualities to different locations: the tubular arm passes through the base assembly with its full circular cross-section intact in the high-stress area, while welding operations are performed in locations where the arm is away from maximum bending moments, allowing for simplified end preparation only where it does not compromise strength.
3Device complexity
If outriggers are positioned only on one side of the base assembly, then the structure is simpler, but the bending moments at the barrier-base plate interface are not adequately counteracted
Solution Approach 1:
The patent combines the outrigger support function with the tubular arm structure itself. The tubular arm serves dual purposes: as the main structural element and as the outrigger support, extending through the base assembly to provide stabilization on both sides, thereby merging components to achieve balanced support without adding separate outrigger elements.
Data Source
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AI summary
The invention relates to a transportable barrier for a crowd block, wherein the barrier (1) comprises a horizontal base assembly (2) and a blocking railing (3) which is arranged on a first long side (19) of the base assembly (2), and wherein the barrier (1) has at least one stabilising arm (4) which connects to said long side (19) to support the blocking railing (3) on the side facing away from the base assembly (2), wherein a lower leg (18) of the at least one extension arm (4) extends in one piece as a uniform material beyond the long side (19) of the base assembly (2) and into the base assembly (2), wherein the at least one stabilising arm (4) is formed as a whole in one piece as a uniform material, and wherein the upper leg (25) is connected to the lower leg (18) via a curve (37).