Expansion Joint Sliding Plate Transverse Movement
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Solution Overview
Problem
Conventional expansion joint systems are constrained in transverse movement due to the fixed attachment of steel cover plates to rubber seals, limiting their ability to accommodate larger movements caused by thermal changes, seismic events, and vehicle loads, which can render bridges unusable.
Innovation Solution
An expansion joint system featuring an elastomeric seal member with a recess for an elongated guide and a sliding rigid plate member that can move independently in the transverse direction, allowing for greater flexibility and movement without mechanical fasteners, enabling the system to bridge gaps between structural deck members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the steel cover plate is fixedly bolted to the rubber seal member, then the connection strength is improved, but the transverse movement capability is severely constrained
Solution Approach 1:
The system divides the connection into two independent parts: the rubber seal member remains attached to the bridge plate, while the guide member is separately positioned in the recess. This segmentation eliminates the need for bolting the cover plate to the rubber seal, allowing the rubber seal to move freely in the transverse direction while maintaining connection strength through the guide-member-recess interface.
Solution Approach 2:
The guide member acts as an intermediary element between the rubber seal member and the bridge plate. Instead of directly bolting the bridge plate to the rubber seal (which would constrain movement), the guide member mediates the connection, providing both structural support and freedom of movement through its interaction with the recess.
2Stability of the object's composition
If conventional expansion joint systems are used with fixed attachments, then structural stability is improved, but the ability to accommodate larger movements is limited
Solution Approach 1:
The system transitions from a static fixed attachment to a dynamic configuration where the bridge plate can move relative to the rubber seal member. The guide member sliding within the recess creates a dynamic interface that maintains structural stability while accommodating thermal expansion, contraction, and seismic movements.
Solution Approach 2:
The invention changes the movement parameter from constrained (fixed bolted connection) to free-moving (guide in recess). This parameter change allows the expansion joint to accommodate larger transverse movements while maintaining structural integrity through the guide-recess interaction.
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 design enhances the ability of expansion joint systems to accommodate larger transverse movements, reducing the likelihood of damage and maintaining bridge usability during thermal and seismic events.
Implementation Method 1
An opening or gap is purposely provided between adjacent structural members for accommodating dimensional changes within the gap occurring as expansion and contraction due to temperature changes
Implementation Method 2
said rigid plate member can slide in the transverse direction
Data Source
AI summary
An expansion joint sealing system for bridging and sealing a gap located between two spaced-apart structural deck members. The expansion joint sealing system includes an elastomeric seal member and a substantially rigid plate member. The elastomeric seal member is fixedly attached to an underlying structural deck member and is able to expand and contract in the longitudinal direction in relation to the traffic direction across the expansion joint. The rigid plate is not fastened to the elastomeric seal member with mechanical fasteners or other fastening means, but is slidingly engaged with the elastomeric seal member through an elongated guide member. As the rigid plate member is not fastened to the elastomeric seal member, it is able to move along a guide member in a direction that is transverse to the direction of traffic across the expansion joint.