Ultra-high-strength concrete pressure elements for cantilever slab connections
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Solution Overview
Problem
Cantilever slab connection elements face issues with corrosion and structural integrity due to metal pressure elements forming cold bridges and being sensitive to temperature differences, leading to spalling or destruction, and existing solutions are complex and costly.
Innovation Solution
The use of ultra-high-strength concrete pressure elements with a dumbbell-like design, where the pressure elements are made entirely of ultra-high-strength concrete, are inserted into the insulation body and designed to match the thermal expansion and conductivity of adjacent slabs, eliminating the need for separate corrosion protection and reducing material volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal pressure elements are used in cantilever slab connection elements, then structural strength and load-bearing capacity are improved, but corrosion damage and cold bridge formation occur leading to concrete spalling
Solution Approach 1:
The patent changes the material parameter from metal to ultra-high-strength concrete, fundamentally altering the properties of the pressure element. This material substitution eliminates corrosion susceptibility and cold bridge effects while maintaining load-bearing capacity through the superior compressive strength of ultra-high-strength concrete
Solution Approach 2:
The pressure element is constructed as a composite structure combining ultra-high-strength concrete with reinforcement elements. This composite approach achieves both the corrosion resistance of concrete and the tensile strength of metal reinforcement, resolving the contradiction between strength and corrosion resistance
2Reliability
If pressure elements protrude out of the insulation body to engage with slabs, then connection reliability is improved, but temperature differences cause spalling or destruction due to thermal expansion
Solution Approach 1:
The patent changes the thermal parameters of the pressure element by using ultra-high-strength concrete, which has thermal expansion characteristics closer to those of concrete slabs. This reduces thermal stress and prevents spalling caused by temperature differences between the pressure element and adjacent slabs
Solution Approach 2:
The pressure element is made from the same material (ultra-high-strength concrete) as the surrounding structural elements. This material homogeneity ensures compatible thermal expansion behavior and eliminates the thermal mismatch that causes spalling in heterogeneous material systems
3Reliability
If corrosion protection coatings are applied to pressure elements, then corrosion resistance is improved, but production complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex corrosion protection systems with a inherently corrosion-resistant material (ultra-high-strength concrete). This eliminates the need for additional protective coatings and simplifies production while maintaining long-term corrosion resistance
Solution Approach 2:
The ultra-high-strength concrete pressure element provides its own corrosion protection through its inherent material properties. The material is naturally resistant to corrosion without requiring external protective measures, making the system self-protecting and eliminating complex coating applications
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 prevents corrosion and structural damage while improving heat insulation and reducing material costs by using ultra-high-strength concrete pressure elements that match the thermal properties of adjacent slabs, ensuring durability and cost-effectiveness.
Implementation Method 1
the pressure elements are made entirely of ultra-high-strength concrete, are inserted into the insulation body and designed to match the thermal expansion and conductivity of adjacent slabs
Implementation Method 2
designed to match the thermal expansion and conductivity of adjacent slabs
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The element (1) has pressure elements (5) made of concrete and provided with a connecting bar, circulation sections, upper traction bar (2) and a shear bar (4) through a heat insulating isolation body (6) made of a mineral wool plate. The connecting element is in operative connection with a base- or cover plate and a cantilever plate in an inserted condition. The sections are attached with end surfaces at the connecting bar on two sides of truncated pyramid-shaped transitions, where the end surfaces are approximately aligned with lateral exterior surfaces of the body in the inserted condition.