Ledger Sleeve Insert With Anti-Rotation Stabilizers for Load Distribution
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Solution Overview
Problem
Current methods for attaching ledger boards to structures face challenges such as misalignment, increased labor and material costs, and vulnerability to environmental forces like wind, particularly with large diameter bolts and metal reinforcements, leading to inefficiencies and structural weaknesses.
Innovation Solution
A ledger sleeve insert system comprising a sleeve insert with a plate and stabilizers that is partially inserted into a ledger, allowing a fastener to traverse its length and anchor into a substrate, distributing loads more evenly and preventing rotation, formed from materials like thermoplastics or metals with UV resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If larger diameter bolts are used to increase resistance to shear and tensile forces, then mechanical performance is improved, but installation difficulty and material cost increase
Solution Approach 1:
The bolt is segmented into two functional parts: a larger diameter portion that remains in the ledger board to provide structural strength, and a smaller diameter threaded portion that extends into the concrete for anchoring. This segmentation allows each part to be optimized independently - the larger diameter provides the necessary shear and tensile resistance while the smaller threaded portion enables easier installation and reduces material cost.
Solution Approach 2:
Different sections of the bolt have different diameters tailored to their specific functional requirements. The portion embedded in the ledger board has a larger diameter to resist shear and tensile forces locally at the connection point, while the anchoring portion has a smaller diameter optimized for concrete engagement and installation ease.
2Ease of operation
If smaller diameter bolts are used for efficient installation, then ease of operation is improved, but mechanical performance decreases
Solution Approach 1:
The bolt is divided into functional segments where the smaller diameter threaded portion handles the anchoring function efficiently during installation, while the larger diameter portion embedded in the ledger board provides the necessary mechanical strength for load-bearing applications.
3Strength
If multiple bolts are installed at closer intervals to distribute loads, then load distribution is improved, but alignment precision requirements increase
Solution Approach 1:
The multi-diameter bolt serves multiple functions simultaneously: it provides structural strength through its larger diameter portion, enables precise alignment through its threaded portion that engages with pre-drilled holes, and distributes loads effectively. This multi-functionality reduces the need for multiple separate components and simplifies the installation process while maintaining load distribution requirements.
Data Source
AI summary
A ledger sleeve insert system, comprising a sleeve insert configured and dimensioned to be at least partially inserted into a bore of a ledger. The sleeve insert may include an aperture that traverses its entire length from a first end to a second end, the first end comprising a plate formed thereon. The aperture may be configured to receive a fastener that can traverse the sleeve insert and anchor to an underlying substrate. The sleeve insert may include one or more stabilizers formed along its outer periphery to prevent rotation when installed within a ledger. When installed, the plate can remain external to the ledger and abuts its outer surface, while the remainder of the insert, including the stabilizer(s), is nested within the ledger bore. The sleeve insert may be formed from metal or thermoplastic. Methods associated with the use and manufacturing of the sleeve insert are also described.