Tunnel Protective Element with Integrated Drainage

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In tunnel construction, leaks often occur between the protective layer and the seal of concrete elements, leading to potential corrosion and detachment issues due to groundwater pressure, which existing solutions attempt to address through reinforced anchorage and complex dimensioning, but these methods increase production complexity and may not ensure complete impermeability.

Innovation Solution

Incorporating a drainage element with openings and a closure mechanism in the protective section, allowing targeted discharge of groundwater and ensuring impermeability, while maintaining a secure connection to the concrete element, using injection molding for a single-piece connection and prestressed components to manage pressure-induced detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If reinforced anchorage and complex dimensioning are used to prevent detachment, then the reliability of the protective layer connection is improved, but the device complexity and production complexity increase

Engineering Contradiction:

Improveconnection reliabilityVSAvoidproduction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the harmful groundwater pressure from the system by introducing drainage elements (drainage holes, drainage channels) that allow water to escape from between the protective layer and seal. This removes the root cause of detachment rather than merely reinforcing the connection, thereby improving reliability without proportionally increasing complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of trying to prevent water accumulation through impermeable barriers alone, the patent inverts the approach by intentionally creating drainage pathways. The system accepts that water may penetrate and provides controlled escape routes, transforming the problem of water pressure into a managed drainage system

Inventive Principle:

Principle #13The other way round (Inversion)

2Strength

If complex dimensioning and reinforced anchorage are implemented, then the resistance to pressure-induced detachment is improved, but the ease of manufacture deteriorates

Engineering Contradiction:

Improveresistance to detachmentVSAvoidproduction simplicity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent segments the protective system into distinct functional components: the protective layer, seal, and integrated drainage elements (drainage holes, channels). This segmentation allows each component to be optimized independently and manufactured using standard injection molding techniques, maintaining ease of manufacture while achieving reliable pressure resistance through the combined system

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The drainage elements serve multiple functions: they drain groundwater to prevent pressure buildup, maintain the sealing integrity, and reduce the need for complex anchorage systems. This multi-functionality achieves strong detachment resistance without requiring specialized or complex manufacturing processes

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If the protective layer is made completely impermeable, then the protection against corrosion is improved, but the accumulation of groundwater pressure increases leading to detachment

Engineering Contradiction:

Improvecorrosion protectionVSAvoidgroundwater pressure

Core Design Contradiction:

Object-affected harmful factorsVSStress or pressure

Solution Approach 1:

The patent applies different properties to different parts of the protective system: the protective layer and seal maintain high impermeability for corrosion protection, while localized drainage elements (holes, channels) provide permeable pathways for water escape. This local differentiation allows the system to achieve both corrosion protection and pressure management simultaneously

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10830043B2Protective element with drainage, for connecting to a concrete element of a tunnel extension

Publication Date: 2020.11.10 HERRENKNECHT AG

AI summary

The invention relates to a protective element for connecting to a concrete element of a tunnel extension, which has a protective section having a first side facing the concrete element (10), on which first side at least one connecting element (17) is provided for establishing a retaining connection of the protective section to the concrete element (10), wherein the protective section is made from at least one plastic material, characterized in that the protective section (20) has at least one drainage element (40) through which a fluid can pass from the first side of the protective section (20) to the opposite side of the protective section (20) facing away from the concrete element (10).