Inflatable Reentrant Formwork Device with Magnetic Attachment
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Solution Overview
Problem
Current methods for creating recesses in concrete structures, such as using wooden or polystyrene forms, are not reusable, labor-intensive, and prone to damage due to concrete pressure, requiring specialized labor and resulting in rough edges that need patching.
Innovation Solution
A reusable formwork device with a flexible and inflatable pocket equipped with magnetic attachment to metal formwork panels, inflated during concrete pouring to resist pressure and deflated for easy removal, made of fibrous and waterproof materials to minimize wear and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wooden or polystyrene reservation elements are used, then the reservation can be created on site, but they are not reusable and require specialized labor for manufacturing and removal
Solution Approach 1:
The reservation element changes its physical state from deflated to inflated during use. The flexible pocket is inflated with air or gas to create the reservation shape, then deflated for removal and reuse. This parameter change enables reusability while maintaining on-site creation capability.
Solution Approach 2:
The invention uses pneumatic inflation to create the reservation shape. A flexible pocket is inflated with air or gas to form the desired reservation geometry, eliminating the need for specialized wooden or polystyrene forms. The pocket can be inflated on-site and then deflated for reuse.
2Ease of manufacture
If wooden reservation elements are used, then they can be manufactured locally, but they swell during concreting making stripping difficult
Solution Approach 1:
The flexible pocket is inflated with air or gas to create the reservation shape, eliminating the need for wooden forms that swell during concreting. The pneumatic inflation provides a stable, non-swelling structure that can be easily stripped by deflation after the concrete has set.
Solution Approach 2:
The reservation element transitions from a solid wooden form to an inflatable pneumatic structure. This parameter change eliminates the swelling problem inherent in wooden forms during concreting, while the deflated state allows for easy removal and reuse.
3Productivity
If prefabricated reusable dummies are used, then reusability is achieved, but they require magnetic shoes and specialized attachment to metal panels
Solution Approach 1:
The reservation element uses pneumatic inflation to create the reservation shape, eliminating the need for complex magnetic attachment mechanisms. The flexible pocket can be inflated to any desired shape and size, providing simplicity in both attachment and configuration.
4Strength
If concrete pressure is applied to the reservation, then the reservation is formed, but the reservation is damaged during removal
Solution Approach 1:
The flexible pocket is inflated with air or gas to create the reservation shape, providing a resilient structure that can withstand concrete pressure. The pneumatic structure expands to resist concrete thrust and maintains its shape without damage, then can be easily deflated and removed after the concrete has set.
Solution Approach 2:
The reservation element changes from a rigid structure to an inflatable pneumatic structure. This parameter change allows the reservation to flex and expand under concrete pressure without damage, while maintaining its shape and integrity throughout the concreting process.
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 allows for efficient, damage-free, and labor-friendly creation of recesses, as the device can be reused multiple times without requiring specialized labor, maintaining a neat finish and reducing the need for repairs.
Implementation Method 1
equipped with magnetic means for its attachment to at least one of the two metal formwork panels of the formwork
Implementation Method 2
inflate it with a pressure greater than or equal to the pressure sufficient to resist the impact due to the projection of the concrete on one of the faces of the pocket during the filling of the formwork and at sufficient pressure to resist the force due to the mass of concrete supported by the different parts of the pocket
Data Source
Figure 1~2
AI summary
The invention relates to a reentrant device for the formwork of a concrete structure provided with magnetised means for attaching same to at least one of the two metal panels of the formwork. The device is made up of a flexible, inflatable bag, provided with at least one valve so as to be able to inflate same with a pressure no lower than the pressure that is high enough to withstand the impact caused by spraying concrete onto one of the surfaces of the bag during the filling of the formwork and with a pressure that is high enough to withstand the force from the mass of concrete supported by the various portions of the bag.