Arch Structure Cut End Deformation Control

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Solution Overview

Problem

Arch-type structures with beveled or skewed ends are prone to deformation and failure during backfilling and regular use due to lack of stability, requiring labor-intensive and costly reinforcement methods like steel, concrete, or tie-back arrangements.

Innovation Solution

A method involving the progressive building of mechanically-stabilized earth structures with interposed reinforcement layers and load distribution devices, such as angle iron, to secure and support the cut end regions of arch-type structures, reducing point loads and deformation risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If traditional reinforcement methods (steel, concrete, or tie-back arrangements) are used to prevent deformation of cut end regions, then structural stability is improved, but construction cost and labor intensity increase

Engineering Contradiction:

Improvestability of cut end regionVSAvoidcomplexity of reinforcement method

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The reinforcement system is segmented into multiple horizontal reinforcement layers spaced vertically along the cut end region, with each layer independently secured to the structure. This segmentation allows distributed reinforcement without requiring a monolithic complex reinforcement system, reducing overall complexity while maintaining stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A load distribution device (such as a angle iron or distributed bearing plate) is introduced as an intermediary element between the reinforcement layer and the cut end region. This intermediary distributes the load from the reinforcement across a wider area of the structure, reducing point loads and simplifying the direct connection requirements, thereby reducing construction complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If reinforcement layers are secured directly to the extended leg portion, then deformation control is improved, but point loads increase causing localized stress concentration

Engineering Contradiction:

Improvedeformation control of cut end regionVSAvoidpoint loads on extended leg portion

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

A load distribution device serves as a mediator between the reinforcement layer and the extended leg portion. This device (such as an angle iron or distributed bearing plate) transfers the concentrated load from the reinforcement layer across a wider area of the structure, reducing point loads and preventing localized stress concentration while maintaining effective deformation control.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The load distribution device is positioned specifically at the interface between the reinforcement layer and the extended leg portion, providing localized stress distribution exactly where needed. This targeted approach concentrates the reinforcement effect at critical locations while distributing loads away from vulnerable points, optimizing both deformation control and stress distribution.

Inventive Principle:

Principle #3Local quality

3Strength

If multiple compacted layers of fill are layered with reinforcement layers, then structural support is improved, but construction time increases

Engineering Contradiction:

Improvestructural support of cut end regionVSAvoidconstruction time for backfilling process

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The reinforcement layers are installed and secured to the extended leg portion before the compacted layers of fill are placed. This preliminary action ensures that the reinforcement structure is in place to provide immediate structural support as the fill is added, rather than requiring the reinforcement to be installed after the fill is placed, thereby reducing overall construction time while maintaining structural integrity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The construction process maintains continuous useful action by alternating between placing compacted fill layers and adding reinforcement layers in a systematic sequence. Each layer is compacted and secured before the next layer is added, ensuring continuous progress without idle time, and the process can be efficiently managed to complete the entire backfilling operation in minimal time while achieving the required structural support.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentEP1963582B1Method of controlling deformation of a cut end region of an arch type structure

Publication Date: 2014.02.12 AIL INT

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AI summary

A method of controlling deformation of a cut end region (20) of an erected arch-type structure (10) for use in underpass construction and the like where the cut end region has at least one extended leg portion. The method comprises building progressively at least one layer of mechanically-stabilized earth adjacent the extended leg portion by alternately layering a plurality of compacted layers of fill (36) with interposed layers of reinforcement (38). Each layer of reinforcement is secured to the extended leg portion during the progressive building. The securement of the layers of reinforcement to the extended leg portions provide support in controlling deformation of the cut end region during backfilling and regular service.