Wall Formwork Plastic Sleeve for Anchor Hole Concrete Prevention
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Solution Overview
Problem
Existing wall formworks face challenges in preventing concrete from entering anchor holes, and there is a difficulty in efficiently removing concrete from these holes once it has entered.
Innovation Solution
The implementation of a wall formwork system that includes plastic sleeves fitted into anchor holes in a force-fit and/or form-fit manner, which prevents concrete from entering and allows for easy removal of concrete that may have accidentally entered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If seals are used to prevent concrete from entering anchor holes, then concrete penetration is reduced, but the complexity of the anchor system increases and seals may be damaged
Solution Approach 1:
The invention extracts the sealing function from a separate seal component and integrates it into the sleeve itself through the conical surface geometry. The sleeve's tapered shape creates a self-sealing effect when compressed during anchor rod insertion, eliminating the need for separate seal components and reducing system complexity while maintaining concrete prevention functionality.
Solution Approach 2:
The sleeve transitions from an uncompressed state with a larger diameter to a compressed state with a smaller diameter when the anchor rod is inserted. This parameter change in the sleeve's dimensions creates the sealing effect, allowing the same component to serve both as a concrete barrier and as a mechanism that adapts to the anchor rod while preventing concrete penetration.
2Ease of repair
If concrete enters anchor holes, then removal effort increases significantly without the sleeve
Solution Approach 1:
The sleeve acts as an intermediary between the anchor hole and the concrete. By providing a removable plastic barrier, the sleeve mediates the interaction between concrete and the anchor hole, allowing concrete to be easily removed from the sleeve without directly contacting the anchor hole structure, thereby significantly reducing cleanup effort.
Solution Approach 2:
The plastic sleeve is designed as a disposable, low-cost component that can be easily removed and discarded after concrete hardening. This approach trades the cost of a reusable complex removal system for inexpensive single-use sleeves that simplify the removal process by providing a ready-made containment structure that can be pulled out with minimal effort.
3Stability of the object's composition
If a flange is added to the sleeve, then the sleeve is secured against outward pulling, but the insertion complexity increases
Solution Approach 1:
The flange is pre-formed as an integral part of the sleeve during manufacturing, eliminating the need for separate assembly steps. The preliminary formation of the flange ensures proper positioning and stability while maintaining insertion simplicity, as the flange is already in its final configuration and requires no additional assembly operations on-site.
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 use of plastic sleeves effectively prevents concrete from entering anchor holes and allows for easy removal of any concrete that may have entered, reducing the effort required for maintenance and ensuring a smooth construction process.
Implementation Method 1
Each sleeve (4) can therefore be held in the anchor hole (3) by static friction
Implementation Method 2
The sleeve (4) extends from one end of the anchor hole (3) to the other end of the anchor hole (3)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a wall formwork for the construction of walls with a formwork facing (1) and elements (2) which support the formwork facing (1), with several anchor holes (3) which pass through supporting elements (2), with a sleeve (4) made of plastic which is held in a force-fit and/or form-fit manner in an anchor hole (3), wherein the sleeve (4) extends from one end of the anchor hole (3) to the other end of the anchor hole (3), and wherein the outer face of the sleeve (4) tightly abuts the inner face of the anchor hole (3) at the side of the formwork facing, characterized in that each anchor hole (3) comprises a sleeve (4). The invention further relates to a method for cleaning a wall formwork with the features according to one of the preceding claims, characterized in that concrete is driven out of an anchor hole.