Removable Dowel Connector for Pavement Slab Replacement
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Solution Overview
Problem
The restoration of pavement over utility trenches in heavily traveled areas, such as city intersections, is challenging due to the laborious process of inserting load transfer dowels and the difficulty in removing and replacing pre-fabricated pavement slabs without compromising the structural integrity of the existing pavement.
Innovation Solution
A system involving a connector with an axial opening and engagement components, allowing for the easy removal and replacement of pavement slabs by cutting the connector into two parts, using a coil bolt mechanism to extract the connector from the existing slab, and reinserting a new connector with a binder material to secure it in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional solid steel dowels are used for load transfer, then structural strength is improved, but removal and replacement becomes extremely difficult and time-consuming
Solution Approach 1:
The dowel is divided into multiple segments along its length, with engagement components positioned at intervals. This segmentation allows the dowel to be removed in sections rather than as a single solid piece, dramatically simplifying removal while maintaining load transfer strength through the distributed engagement components.
Solution Approach 2:
The engagement components are extracted from a solid monolithic dowel and positioned as separate elements along the dowel length. This extraction allows the dowel to retain its load-bearing function while enabling easy removal by extracting individual engagement components rather than removing an entire solid dowel.
2Adaptability or versatility
If pavement slabs are removed for utility repair, then utility access is improved, but structural integrity of existing pavement is compromised
Solution Approach 1:
The engagement components are positioned at specific locations along the dowel where they provide localized anchoring to the pavement. This local quality ensures that when slabs are removed for utility access, the remaining engagement components maintain structural integrity at critical points while allowing necessary removal elsewhere.
Solution Approach 2:
The engagement components are pre-positioned within the pavement during initial construction, creating predetermined anchoring points. This preliminary action ensures that when future utility repairs require slab removal, the structural integrity is automatically maintained at these pre-established locations without requiring additional reinforcement.
3Strength
If dowels are properly inserted in replacement pavement, then load transfer is improved, but labor time and complexity increase
Solution Approach 1:
The engagement components are pre-positioned within the pavement during initial construction, creating ready-made anchoring points. This preliminary action eliminates the need for time-consuming drilling and installation operations during later replacement pavement work, as the components are already in place and simply need to be connected.
Solution Approach 2:
The engagement components are designed to automatically engage with the dowel segments through mechanical interference or simple connection mechanisms. This self-service feature eliminates the need for complex installation procedures, special tools, or skilled labor, allowing workers to quickly install load transfer dowels by simply connecting pre-positioned components.
Data Source
AI summary
A pre-fabricated pavement slab installation and replacement system is provided. The system includes a connector having an axial opening therethrough and engagement surface within the opening. The system further includes a pavement slab and an adjacent pavement slab, wherein a portion of the connector is embedded in the pavement slab and a remaining portion of the connector is exposed. The adjacent pavement slab has an interconnection slot, that can cover the remaining portion of the exposed connector. The system further provides that under the condition that the pavement slab and the adjacent pavement slab are cut apart, the connector is cut into a first half and a second half, wherein the first half of the connector contains the first engagement component and the second half of the connector contains the second engagement component. The first half of the connector can be subsequently removed by engaging the engagement surface.