Concrete Formwork Sealing Element for Water-Tight Joints
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Solution Overview
Problem
Existing methods for creating partial formwork and expansion joint formwork in concrete structures face challenges in providing a reliable water barrier, as current solutions are complex, costly, and often ineffective in preventing water penetration at joints, especially when cast in multiple stages or exposed to water.
Innovation Solution
A device featuring carrier elements with parallel webs or pins to support a sealing film or plate, allowing for precise placement and secure holding during concrete casting, enabling easy and cost-effective water-tight sealing between partial structures and accommodating expansion movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foils made of rubber or plastic are inserted between reinforcements to prevent water passage, then water tightness is improved, but the insertion process becomes very complex and requires skilled workers
Solution Approach 1:
The sealing element is pre-attached to the formwork panel before the reinforcement placement, so that when reinforcements are installed, the sealing element is already in position. This eliminates the need for complex in-situ insertion operations and ensures proper positioning without requiring skilled workers to manually place and angle the sealing foil correctly.
2Reliability
If sealing plates are used between formwork panels, then water barrier is improved, but the sealing effect is limited to narrow areas between U-profiles and brackets
Solution Approach 1:
The sealing element is integrated directly with the formwork panel as a unified component, rather than being separate between U-profiles or brackets. This merging ensures that the sealing element spans the entire relevant area and works together with the formwork structure to provide continuous water barrier coverage across the full joint area.
3Reliability
If joint tapes are screwed to formwork panels, then water seal is improved at front edges, but the tape becomes useless in the concrete mass area
Solution Approach 1:
The sealing element is attached to the formwork panel before concrete pouring, ensuring it is positioned correctly in advance. This preliminary attachment allows the sealing element to extend into the concrete mass area and remain effective throughout the entire joint region, not just at the edges, since it is already in place before the concrete is poured.
4Stability of the object's composition
If elastic expansion means are inserted between adjoining partial areas, then shrinkage and expansion cracks are prevented, but water penetration at expansion joints remains problematic
Solution Approach 1:
The sealing element is combined with the expansion joint formwork as an integrated component, ensuring that both the expansion function and sealing function are provided by a unified system. This integration ensures that the sealing element remains effective across the expansion joint area while accommodating the necessary movement, rather than being a separate component that may fail to seal properly.
Data Source
Figure 1~5
Figure 6~9
Figure 10
AI summary
The device has a plate for temporary limitation of a partial structure (3,5) during casting and hardening of the liquid concrete and a sealing element for securing the water tightness in the area of the partial structures butting together. Two support elements are provided, which are connected with a longitudinal edge of a plate element or an expansion plate. The support elements are made of metal sheet, plastic, metal or cement material.