Modular Post Anchor Adapter With Interference Fit
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Solution Overview
Problem
Post anchors face challenges in balancing weight and strength, ease of installation, water sealing, and adaptability to different ground conditions, often requiring costly welding or unreliable fasteners, and are prone to corrosion and post displacement during installation.
Innovation Solution
A modular post anchor adapter made of unitary cast or machined steel with a square tubular body, featuring a horizontal plug wall to separate upper and lower female portions, providing a secure fit and preventing water and soil infiltration, and a tapered lower portion for interference fit with a smaller anchor tube, along with crescent-shaped tabs to prevent soil entry and post displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the anchor is made light in weight for ease of driving and to reduce costs, then ease of installation and material cost are improved, but strength to withstand forces during installation and vehicle impact is reduced
Solution Approach 1:
The anchor is divided into two separate components: a lightweight anchor body for ease of installation and a separate strengthening sleeve that adds strength when needed. This segmentation allows each component to be optimized independently - the anchor body for lightness and the sleeve for strength.
Solution Approach 2:
The strengthening sleeve is designed to telescope over the anchor body, creating a nested structure. The sleeve contains internal ribs that engage with the anchor body, allowing the lightweight anchor to gain additional strength when the sleeve is in place, while maintaining ease of installation when used alone.
2Strength
If the anchor is made sufficiently strong to withstand installation forces and impact forces, then strength and durability are improved, but weight increases making it difficult to drive and increasing material and transportation costs
Solution Approach 1:
The anchor system is segmented into a base anchor and an optional strengthening sleeve. The base anchor remains lightweight for easy installation, while the sleeve provides additional strength when required by the application, allowing strength to be added only where needed rather than throughout the entire anchor.
Solution Approach 2:
The strengthening sleeve provides localized reinforcement at the upper portion of the anchor where strength is most needed to withstand vehicle impacts and installation forces, while the lower portion embedded in concrete or ground retains its lightweight construction.
3Strength
If conventional telescoping tubing is added to strengthen the anchor, then strength is improved, but the pieces do not stay attached during driving or transport, and tolerance between parts creates slop allowing post movement
Solution Approach 1:
The strengthening sleeve is pre-equipped with attachment mechanisms including internal ribs and engagement features that are prepared in advance to securely connect with the anchor body during installation, ensuring reliable attachment before the anchor is driven into the ground.
Solution Approach 2:
The strengthening sleeve uses a flexible yet rigid structure with integrated attachment features that maintain secure connection during the dynamic conditions of installation and transport, while still allowing for proper fitting and alignment.
4Reliability
If welding or bolting is used to join coaxial parts, then attachment reliability is improved, but manufacturing cost and installation complexity increase
Solution Approach 1:
The anchor and strengthening sleeve are designed with self-aligning and self-attaching features including internal ribs, engagement protrusions, and interference fit geometries that automatically secure the components together during installation without requiring external welding or bolting operations.
Solution Approach 2:
The connection between the anchor and strengthening sleeve utilizes interference fit and friction-based attachment mechanisms that change the physical parameters of the interface (pressure, friction coefficient) to create a reliable connection without thermal or mechanical fastening processes.
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
The solution offers a lightweight, durable, and adaptable anchor system that reduces installation costs, prevents corrosion, and ensures secure post positioning across various ground conditions without expensive welds or fasteners, facilitating easy installation and maintenance.
Implementation Method 1
a tapered lower portion for interference fit with a smaller anchor tube
Implementation Method 2
providing a secure fit and preventing water and soil infiltration
Implementation Method 3
along with crescent-shaped tabs to prevent soil entry and post displacement
Data Source
AI summary
A post anchor/anchor adapter system is unitary cast or machined steel or the like. An anchor/adaptor alone is driven alone into a hole cut in in-place concrete. The system includes an anchor extension tube for driving into soft soil. The inventive anchor/adaptor has a body in the form of an elongate square tube having radius-curved corners vertically driven into a round receiving hole, forming creases and a secure anchor. The tube has an upper female portion for a post and a lower female portion for an extender and is divided by a horizontal plug wall integral with the tube structure. The lower female portion of the anchor/adapter tapers outward towards its lower open end allowing for an interference fit with the driven tube acting as an anchor. The female portion upper end has crescent-shaped tabs defining a disk sized to plug the drilled hole.