Decking Fixing for Girder Extrusion Thermal Expansion

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Solution Overview

Problem

The existing manufacturing process for girders by spinning often results in insufficient geometric conformity of the beams due to lateral offset of prestressing cables, leading to beam deflection and scrap when the cables are cut, causing a significant waste of produced beams.

Innovation Solution

The decking is fixed to the foundations using a combination of a point rigid connection and longitudinal sliding connections that allow homogeneous thermal expansion, preventing bending and ensuring predictable deformation during the steaming process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the decking is rigidly fixed to the foundations, then the decking is stable and immobilized, but thermal expansion during steaming causes bending and lateral offset of prestressing cables leading to beam deflection and scrap

Engineering Contradiction:

Improvestability of deckingVSAvoidgeometric conformity of beams

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The patent transforms the rigid fixed connection into a dynamic system with longitudinal sliding connections that allow the decking to move adaptively during thermal expansion, preventing bending while maintaining transverse stability through lateral stops

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the connection system into distinct functional components: point rigid connections for transverse stability, longitudinal sliding connections for expansion accommodation, and lateral stops for lateral immobilization, allowing each to perform its specific function independently

Inventive Principle:

Principle #1Segmentation

2Stress or pressure

If the decking is allowed to expand freely, then thermal stress is reduced, but the decking may bend or deform irregularly causing beam deflection

Engineering Contradiction:

Improvethermal stress in deckingVSAvoidflatness of decking

Core Design Contradiction:

Stress or pressureVSShape

Solution Approach 1:

The patent applies different connection characteristics at different locations and directions: rigid point connections at specific points for stability, sliding connections along longitudinal edges for expansion, and lateral stops at edges for lateral constraint, creating locally optimized connection behavior

Inventive Principle:

Principle #3Local quality

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 solution significantly reduces the scrap rate of produced beams by ensuring the decking expands uniformly, maintaining beam integrity and reducing waste.

Implementation Method 1

the thermal expansion of the decking results in homogeneous displacements of the decking along the upper face of the foundations, in the longitudinal direction and in the transverse direction

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentEP2671699B1Assembly of decking on a bench for manufacturing girders by extrusion

Publication Date: 2015.03.25 KP1

AI summary

The bench has a rectangular decking (1) in the form of a steel plate carried by foundations, where the decking is heated during stoving of girders. A fixing unit fixes the decking to the foundations. The fixing unit includes a rigid securing element at a longitudinal edge (3) of the decking to secure the decking to the foundations. The fixing unit includes a longitudinal slide connection element (6) to connect the decking to the foundations. The connection element includes an ear flap (4) forming a part of a body of the decking and exceeding laterally beyond the longitudinal side of the body.