Elastic Road Surface Connection for Thermal Stress
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Solution Overview
Problem
Built-in parts in road structures, such as manholes and rain drains, experience damage due to differential thermal expansion and mechanical loads, leading to cracks and water infiltration, which compromises the bond between the part and the road surface, causing structural damage and maintenance issues.
Innovation Solution
A connection using an elastic mass composed of elastic chips and a binding agent, combined with granular material, forms a viscous and dimensionally stable layer that compensates for mechanical and thermal stresses, maintaining a firm bond with both the built-in part and the road surface, preventing cracks and water infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a built-in part with great rigidity is used to support loads from passing traffic, then the load-bearing capacity is improved, but the road surface material tears away from the built-in part due to differential thermal expansion and mechanical stresses, causing gaps and cracks
Solution Approach 1:
The patent changes the physical state of the connection material from rigid to elastic by using a two-component system (elastic chips and binding agent) that forms a viscous mass when heated and solidifies when cooled. This allows the connection material to change its properties dynamically - rigid during installation but elastic during service to accommodate thermal expansion and contraction without breaking the bond between the built-in part and road surface.
Solution Approach 2:
The patent uses a composite material consisting of elastic chips (such as rubber granules) combined with a binding agent. This composite provides both the elasticity needed to accommodate differential movement and the adhesive strength needed to maintain the bond. The granular material embedded in the elastic mass further enhances this by providing mechanical interlocking while allowing for elastic deformation.
2Adaptability or versatility
If a film is introduced into the elastic mass to accommodate relative movements, then the flexibility is improved, but a cavity is formed between the film and the elastic mass where moisture can penetrate and freeze, causing cracks
Solution Approach 1:
The patent uses a film component within the elastic mass that can flex and deform to accommodate relative movements between the built-in part and road surface. This film acts as a flexible barrier that maintains continuity even during deformation, preventing moisture from penetrating into cavities while still allowing the necessary elastic movement to occur.
Solution Approach 2:
The film serves as an intermediary element between the elastic mass and the external environment. It mediates the interaction by providing a continuous barrier that prevents moisture infiltration while allowing the elastic mass to perform its function of accommodating thermal and mechanical stresses through deformation.
3Ease of manufacture
If conventional road construction materials are used surrounding the built-in part, then the ease of manufacture is improved, but the materials yield and compress under impact loads, tearing away from the built-in part and creating gaps
Solution Approach 1:
The patent applies preliminary action by pre-heating the two-component connection material to a temperature where it forms a viscous, flowable mass before application. This allows the material to be easily poured or injected into the connection space around the built-in part, ensuring complete filling and intimate contact with all surfaces. After cooling, the material solidifies into a stable, elastic structure that maintains structural integrity under load.
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 elastic connection effectively absorbs deformations and thermal expansions, preventing cracks and ensuring a watertight seal, thus extending the lifespan of the road surface and reducing maintenance needs by maintaining the integrity of the bond between the built-in parts and the road surface.
Implementation Method 1
the built-in parts, such as manhole frames, very often consist of materials whose coefficient of thermal expansion differs significantly from that of the neighboring road surface. As a result, damage from thermal stresses must also be expected in the area of the built-in part.
Implementation Method 2
a layer consisting of an elastic mass is arranged between the built-in part and the road surface, which by virtue of its elasticity can compensate for mechanical stresses that build up between the built-in part and the road surface
Implementation Method 3
These loads are supported by a built-in part that has a comparatively great rigidity, such as manholes, rain drains, road caps, hydrant caps and the like
Implementation Method 4
the road surface is brought up to the built-in part and attached to the built-in part... the road surface... consists for example of asphalt, concrete, sand or similar resilient material and yields to the impacting loads, compresses in the process
Implementation Method 5
the elastic mass consists of an elastic basic substance, which is formed as a mixture of elastic chips and a binding agent connecting the individual chips, which, together with an admixed granular material, forms a viscous connection with the chips, which forms a viscous mass in the hot area and retains its elasticity when cooled
Data Source
Figure 1~13
Figure 2
Figure 6
AI summary
The mounting part connection has an upper limit which lies in a plane with an upper end of the top layer of the road surface. The upper limit of the mounting part is connected with its edge at a top layer of the road surface (27) with a layer consisting of an elastic material (7).