Anchor Bolt Thread Repair in Narrow Tank Foundation Spaces

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Solution Overview

Problem

Corroded anchor bolts in outdoor field tanks pose stability and safety risks during replacement, as direct replacement can lead to facility degradation and fire hazards, and existing solutions do not provide a fundamental repair for anchor bolts embedded in concrete foundations.

Innovation Solution

An anchor bolt machining apparatus comprising an anchor bolt machining die and a die holder, which allows for direct repair of corroded anchor bolts in narrow spaces by coupling a rotational force supply device to the die holder, enabling thread machining and lubricant management to prevent facility instability and safety issues during replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the anchor bolt is replaced entirely, then the corrosion problem is solved, but the stability of the facility degrades and safety problems occur

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidfacility stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention extracts only the corroded threaded portion of the anchor bolt and replaces it with a new threaded insert, while preserving the embedded portion in the foundation. This selective replacement eliminates corrosion risks without compromising the overall stability of the facility-anchor bolt-tank system.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If welding is performed to replace the anchor bolt, then the anchor bolt can be replaced, but fire hazards occur

Engineering Contradiction:

Improveanchor bolt functionalityVSAvoidfire hazard

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention replaces the welding process with a mechanical threading operation. A specialized machining apparatus cuts and forms threads on the anchor bolt or inserted component using mechanical forces, eliminating the need for welding and associated fire hazards while achieving secure connection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Duration of action of stationary object

If the anchor bolt is repaired with paint or corrosion inhibitors, then corrosion progression is slowed, but the fundamental corrosion problem is not solved

Engineering Contradiction:

Improveservice life extensionVSAvoidcorrosion resistance

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The invention performs preliminary action by removing the corroded threaded portion before it can cause further damage or failure. By proactively replacing the damaged section with a new threaded insert, the system prevents future corrosion-related failures rather than merely delaying them with protective coatings.

Inventive Principle:

Principle #10Preliminary action

4Ease of repair

If the anchor bolt is machined in a narrow space, then direct repair is enabled, but access and operation difficulty increase

Engineering Contradiction:

Improvedirect repair capabilityVSAvoidaccess difficulty

Core Design Contradiction:

Ease of repairVSEase of operation

Solution Approach 1:

The invention approaches the machining problem from another dimension by designing a vertically oriented machining apparatus that descends into the narrow space between the foundation and the tank. This vertical access route bypasses the horizontal space constraints, enabling direct repair operations in confined areas.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11247281B2Anchor bolt machining apparatus

Publication Date: 2022.02.15 LG CHEM LTD

AI summary

An anchor bolt machining apparatus including an anchor bolt machining die and a die holder. The anchor bolt machining die includes a first head portion for fixing an anchor bolt and a first body portion receiving a screw machining die and the die holder includes a second head portion coupled to a rotational force supply device, a support portion coupled to the anchor bolt machining die, and a second body portion connecting the second head portion and the support portion.