L-Shaped Rebar Setting Fixture with Angle Adjustment
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Solution Overview
Problem
In reinforced concrete construction, particularly for in-ground structures like swimming pools, setting rebar at a uniform vertical distance from the rim of an excavated pit is challenging due to the lack of a convenient level reference, leading to complex measurements and the need for temporary pins or rods that require additional labor for removal.
Innovation Solution
A fixture and method using L-shaped legs with an angle adjustment device and support brackets, allowing for precise placement of rebar at a predetermined distance from the pit rim, eliminating the need for level references and enabling easy removal after the structure is set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rebar is set using conventional methods without a level reference, then the construction process is simpler, but the manufacturing precision of rebar placement deteriorates
Solution Approach 1:
The fixture is pre-assembled with the support bracket positioned at the exact predetermined distance from the rim before being placed in the pit. This preliminary positioning ensures that when the support bracket engages the rebar, the rebar is automatically placed at the correct elevation without requiring measurement or adjustment during installation
Solution Approach 2:
The fixture acts as an intermediary tool between the pit rim and the rebar. It transfers the geometric relationship of the predetermined distance from the rim to the rebar placement position, ensuring precise positioning without requiring direct measurement between the rim and rebar
2Device complexity
If conventional setting methods are used, then fewer tools are needed, but the productivity of the construction process deteriorates
Solution Approach 1:
The fixture is pre-assembled with the support bracket positioned at the exact predetermined distance from the rim before being placed in the pit. This preliminary positioning ensures that when the support bracket engages the rebar, the rebar is automatically placed at the correct elevation without requiring measurement or adjustment during installation
Solution Approach 2:
The fixture is self-adjusting through the angle adjustment device that allows the operator to level the fixture by adjusting the foot position, without requiring additional leveling tools or complex procedures. The fixture serves its own leveling function
3Difficulty of detecting and measuring
If temporary pins or rods are used for setting rebar, then the measurement process is simplified, but the loss of time for removal deteriorates
Solution Approach 1:
The fixture is designed to be completely removed from the pit after the rebar is set and the concrete is applied. Unlike temporary pins or rods that remain embedded or require removal, the fixture is extracted entirely after serving its positioning function, eliminating any need for subsequent removal operations
Solution Approach 2:
The fixture is designed as a single-use, disposable tool that is placed in the pit for positioning, serves its function, and is then removed. It does not need to be retained or reused, similar to disposable positioning tools, which eliminates time spent on removal and reuse preparation
Data Source
AI summary
A fixture for setting rebar at a predetermined distance from the rim of an excavated pit includes elongated first and second legs each having a proximal end and a distal end, the first and second legs rigidly joined at their mutual proximal ends to form an L-shape; an angle adjustment device carried by the first leg, comprising a foot movable towards or away from the first leg along an axis generally parallel to the second leg; a support bracket carried by the first leg at a predetermined offset distance from the proximal end thereof; and a hook extending from the distal end of the second leg, generally parallel to the first leg.