Tongue-and-Groove Road Slab Joint with Plastic Profile
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Solution Overview
Problem
Existing metalled roads face challenges in simplified slab removal, stability, maintenance costs, and weed control, particularly due to the limitations of current interlocking mechanisms and materials used in road construction.
Innovation Solution
A metalled road design featuring a tongue-and-groove-shaped joint with a plastic profile that accommodates expansion and contraction, allows for easy slab replacement, and provides a barrier against weeds, using a single type of road covering slab with a groove configuration that prioritizes safety by allowing the bottom edge to yield under load, and incorporating a flexible plastic profile for smooth bending and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional elastic material filling is used between consecutive slabs, then the expansion joint function is provided, but the slab stability and interlocking are insufficient
Solution Approach 1:
The invention merges the expansion joint function with the interlocking mechanism by integrating a plastic profile into the joint structure. The plastic profile serves dual purposes: accommodating thermal expansion/contraction while providing mechanical interlocking between slabs through tongue-and-groove engagement, thereby improving slab stability without significantly increasing structural complexity
Solution Approach 2:
The invention uses composite construction by combining concrete slabs with a plastic profile material. The plastic profile is inserted into grooves cut in the concrete slabs, creating a hybrid structure that leverages the rigidity of concrete and the flexibility of plastic to achieve both stability and expansion accommodation
2Stability of the object's composition
If tongue-and-groove joint is used between consecutive slabs, then the interlocking and stability are improved, but the slab removal and replacement become difficult
Solution Approach 1:
The invention segments the joint structure into separate components: the concrete slabs and the removable plastic profile. The plastic profile is inserted into grooves in the slabs but can be independently extracted, allowing individual slabs to be removed by laterally knocking out the profile, thereby facilitating repair while maintaining interlocking stability during normal use
3Shape
If grooves are positioned closer to the road covering side, then the aesthetic appearance is improved, but the safety under overload is reduced
Solution Approach 1:
The invention applies local quality differentiation by positioning grooves asymmetrically within the slab thickness. The grooves are located closer to the bottom side than to the road covering side, creating different structural characteristics at different locations: the top surface remains smooth and aesthetic while the bottom region provides enhanced safety margins for overload conditions
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
The solution simplifies the laying and maintenance of metalled roads by enabling easy slab removal and replacement, enhancing stability, reducing maintenance costs, and preventing weed growth, while ensuring user safety through a flexible and durable interlocking system.
Implementation Method 1
the plastic profile forms an integrated expansion joint to accommodate contraction and expansion of the road covering slabs in the road direction
Data Source
Figure 1~2
AI summary
Metalled road with a road direction and constructed from road covering slabs (2,3) following one another in the road direction and plastic profiles (4) lying between consecutive road covering slabs, wherein the two consecutive road covering slabs are provided on their opposite-lying ends with a respective groove (7), and wherein the plastic profile extends into the respective grooves to form a tongue-and-groove-shaped joint, said joint linking two consecutive road covering slabs to form the metalled road.