Mine Shaft Anti-Seismic Support Using Spring Steel Cylinders

Solution Overview

Problem

Existing methods for supporting mine shafts during earthquakes do not adequately address the differences in soil, sand, and bedrock layers, leading to either inadequate support or excessive material usage, particularly in liquefaction-prone areas.

Innovation Solution

The proposed anti-seismic support method involves creating a circular support groove with horizontal and vertical anchor rods, expansion anchoring slurry, and spring steel cylinders to provide a deformable connection mechanism that resists lateral stress and deformation, ensuring structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If reinforced concrete structures are adopted in an entire wall of a vertical shaft to reduce damage caused by earthquakes, then the overall support strength of the shaft wall is improved, but excessive use and waste of support materials occurs

Engineering Contradiction:

Improveoverall support strengthVSAvoidsupport materials

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The patent applies local quality by providing different support strengths at different locations within the shaft wall. Specifically, the shaft wall is divided into a first support section with higher support strength and a second support section with lower support strength. This differentiation allows the structure to provide enhanced protection where needed (in liquefaction-prone areas) while reducing material consumption in areas where full reinforcement is not necessary, thus resolving the contradiction between overall support strength and material waste.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the shaft wall into distinct support sections based on geological conditions. The shaft wall is divided into a first support section corresponding to liquefaction-prone layers and a second support section corresponding to other soil layers. This segmentation enables tailored support strategies for different geological zones, providing high strength where liquefaction risk exists while using reduced strength materials elsewhere, thereby balancing safety requirements with material efficiency.

Inventive Principle:

Principle #1Segmentation

2Loss of substance

If the overall support strength of the shaft wall is low, then material usage is optimized, but liquefaction-prone layers are easily damaged by earthquakes

Engineering Contradiction:

Improvesupport materialsVSAvoidresistance to earthquake damage

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The patent applies local quality by providing different support strengths at different locations within the shaft wall. Specifically, the shaft wall is divided into a first support section with higher support strength and a second support section with lower support strength. This differentiation allows the structure to provide enhanced protection where needed (in liquefaction-prone areas) while reducing material consumption in areas where full reinforcement is not necessary, thus resolving the contradiction between overall support strength and material waste.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the shaft wall into distinct support sections based on geological conditions. The shaft wall is divided into a first support section corresponding to liquefaction-prone layers and a second support section corresponding to other soil layers. This segmentation enables tailored support strategies for different geological zones, providing high strength where liquefaction risk exists while using reduced strength materials elsewhere, thereby balancing safety requirements with material efficiency.

Inventive Principle:

Principle #1Segmentation

3Stability of the object's composition

If reinforced concrete structures are adopted in an entire wall of a vertical shaft, then the structural integrity is improved, but the complexity of the support structure increases

Engineering Contradiction:

Improvestructural integrityVSAvoidsupport structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing different support strengths at different locations within the shaft wall. Specifically, the shaft wall is divided into a first support section with higher support strength and a second support section with lower support strength. This differentiation allows the structure to provide enhanced protection where needed (in liquefaction-prone areas) while reducing material consumption in areas where full reinforcement is not necessary, thus resolving the contradiction between overall support strength and material waste.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the shaft wall into distinct support sections based on geological conditions. The shaft wall is divided into a first support section corresponding to liquefaction-prone layers and a second support section corresponding to other soil layers. This segmentation enables tailored support strategies for different geological zones, providing high strength where liquefaction risk exists while using reduced strength materials elsewhere, thereby balancing safety requirements with material efficiency.

Inventive Principle:

Principle #1Segmentation

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

This method effectively enhances the anti-seismic performance and deformation resistance of mine shafts by customizing support based on soil conditions, preventing damage from earthquakes while optimizing material usage.

Implementation Method 1

injecting an expansion anchoring slurry into the vertical anchor rod group to expand an expansion open end

Methodology Applied

Scientific EffectExpansion:

Implementation Method 2

fixing an outer support spring steel cylinder against the groove wall... welding an inner support spring steel cylinder to an end of the horizontal transverse anchor rod group

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11428101B2Anti-seismic support method for mine shaft

Publication Date: 2022.08.30 CHINA COAL RES INST

AI summary

An anti-seismic support method for a mine shaft includes: providing a circular support groove in a liquefaction-prone layer of the mine shaft; providing horizontal support holes in a groove wall, and fixing an outer support spring steel cylinder against the groove wall; drilling vertical support holes at a groove bottom, anchoring a vertical anchor rod group into the vertical support holes, and injecting an expansion anchoring slurry into the vertical anchor rod group; making a lower positioning support ring abut against an upper end of the vertical anchor rod group and an inner wall of the outer support spring steel cylinder; fixing an anti-seismic connecting rod group between lower and upper positioning support rings; making an outer wall of an inner support spring steel cylinder abut against the upper and lower positioning support rings; and providing an upper support cover seat atop the outer and inner support spring steel cylinders.