Cast Concrete Screw Hole With Preformed Internal Thread
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Solution Overview
Problem
Existing methods for fastening screws into concrete require significant effort and lead to wear on self-tapping concrete screws due to cutting into hard concrete, resulting in inefficient and durable issues.
Innovation Solution
A method where a thread-forming screw with an external thread is cast into concrete as it hardens, creating a complementary internal thread, allowing for easy screwing and unscrewing without wear, and optionally using a release agent and magnetic fastening means for easier removal and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-tapping concrete screws are driven into hard concrete, then receiving holes are created, but significant wear occurs on the screws and considerable force is required
Solution Approach 1:
The invention applies preliminary action by casting a placeholder body with external thread into the concrete before the concrete hardens. The placeholder body forms a complementary internal thread in the concrete as it hardens, eliminating the need for subsequent thread-cutting operations. This preliminary thread formation resolves the contradiction by creating the receiving hole without subjecting screws to wear-causing cutting forces.
Solution Approach 2:
The placeholder body serves as an intermediary element between the concrete and the final screw. It is cast into the concrete, forms the internal thread structure, and is later removed to leave a clean threaded receiving hole. This intermediary approach eliminates direct contact between the screw and the hard concrete during thread formation, preventing screw wear while still achieving secure fastening.
2Ease of operation
If self-tapping concrete screws are used to create receiving holes, then fastening is achieved, but significant force and effort are required
Solution Approach 1:
The internal thread is formed in advance during concrete hardening by the placeholder body's external thread. This preliminary action eliminates the need for high-force thread-cutting operations, allowing screws to be simply threaded into the pre-formed holes with minimal effort.
Solution Approach 2:
Instead of cutting threads into hard concrete using a screw (as in conventional methods), the invention inverts the process by forming the thread structure passively during concrete hardening. The placeholder body's external thread creates the complementary internal thread in the concrete, reversing the active cutting action and eliminating the need for high driving forces.
3Adaptability or versatility
If placeholder bodies are cast into concrete, then reusable receiving holes with internal threads are created, but the placeholder body must be removed after hardening
Solution Approach 1:
The placeholder body acts as a temporary intermediary that is easily removed after serving its purpose of forming the internal thread. Its design allows for simple extraction from the hardened concrete, leaving a clean threaded hole ready for the final screw. This intermediary approach enables screw reusability without creating manufacturing complexity.
Solution Approach 2:
The placeholder body is designed as a disposable, low-cost component that is cast into the concrete, forms the internal thread, and then removed. Its temporary nature and simple construction make it economically viable despite the additional step of removal, while enabling the valuable outcome of reusable screws and durable receiving holes.
Data Source
Figure 1~2
AI summary
The invention relates to a method for producing a concrete component that has a hole for receiving a screw, for which flowable concrete is poured into a formwork and hardens there, forming the concrete component, wherein within the formwork a thread-forming screw or other placeholder body with at least one external thread is directly encased, directly surrounded or directly brought into contact with the still flowable concrete, and due to the external thread a thread structure is imprinted or formed in the concrete, which then hardens in the receiving hole, forming the concrete component with at least one cast, complementary internal thread.