Post Anchor with Bottom Spacer for Concrete Uplift Resistance
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Solution Overview
Problem
The existing methods for anchoring wooden posts in concrete, such as two-step concrete pouring, pill blocks, and bolt-on anchors, are complex, time-consuming, and costly, and do not efficiently resist uplift forces.
Innovation Solution
A single-step concrete pour anchoring system using a bottom spacer with teeth to secure the post and a sheet metal anchor device with protrusions and teeth to resist uplift forces, allowing for easy installation and high uplift capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anchoring methods (two-step pouring, pill blocks, bolt-on anchors) are used, then post anchoring provides adequate support and uplift resistance, but installation time and process complexity increase significantly
Solution Approach 1:
The patent combines the footing support function and uplift resistance function into a single integrated anchor block that performs both functions simultaneously. The anchor block includes a bottom surface for supporting the post and upwardly extending anchors for uplift resistance, eliminating the need for separate pill blocks and anchor installations.
Solution Approach 2:
The anchor block is pre-formed with embedded anchors and proper geometry before installation. The anchors are already positioned and secured within the concrete block, so no additional anchoring actions are needed during post installation - the block is simply placed in the hole and the post is set on it.
2Reliability
If traditional anchoring methods are used, then adequate uplift resistance is achieved, but the number of installation steps and required operations increase
Solution Approach 1:
The patent merges multiple anchoring operations into a single pre-formed concrete block that provides both footing support and uplift resistance. The block contains embedded anchors, rebar, and proper geometry all integrated into one component that is installed as a single unit.
Solution Approach 2:
The anchor block serves multiple functions simultaneously: it provides a solid footing for the post, resists uplift forces through embedded anchors, positions the post at the correct elevation, and integrates with the concrete pouring process. This multi-functional design eliminates the need for separate components for each function.
3Strength
If heavy pill blocks are used to provide foundation support, then adequate footing is provided, but the weight and handling difficulty increase
Solution Approach 1:
The patent uses lightweight aggregate concrete or foam concrete for the anchor block, which provides adequate structural strength and footing support while significantly reducing the weight compared to traditional dense concrete pill blocks. The reduced weight makes the block easier to handle and install without sacrificing load-bearing capacity.
Data Source
AI summary
An anchor device having a plurality of teeth protruding from planar surfaces configured for placement adjacent to the post. The teeth may be forced into the wood to secure the anchor in position until the post embedment is completed. The anchor comprises a first portion that protrudes from the surface of the post to engage with backfill, typically concrete, to resist post uplift once the backfill cures. A second portion of the anchor is secured to the side surfaces of the post adjacent to the end of the post that is to be embedded and extends beyond the end of the post. When the anchor is installed and the post inserted into a hole, the second portion of the anchor elevates the end of the post from the bottom of the post hole so that concrete backfill may flow beneath the post to form a suitable post foundation.