Wall Formwork Anchor Sleeve Preventing Concrete Embedment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anchor systems for wall formwork in concrete construction often require complex assembly processes and struggle with efficiently managing tensile and compressive forces, leading to difficulties in installing and removing the formwork without concrete flow into the tie rod bores.
Innovation Solution
A method and anchor system utilizing locking devices with pipe sections and sleeves, where the sleeve partially encases the anchor rod and is designed for easy assembly and disassembly, allowing for one-sided operation and preventing concrete flow, with locking devices attached to the wall formwork before erection and connected using threads or bayonet connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anchor rods with threads are used directly in tie rod bores, then the anchor system can absorb tensile forces, but concrete flows into the tie rod bores and embeds the threads, preventing removal of the anchor rod
Solution Approach 1:
The system divides the anchor rod into two functional parts: a threaded end portion that remains embedded in the concrete for retention, and a smooth middle portion that can be removed. The sleeve selectively covers only the smooth middle portion, allowing the threaded end to engage with the concrete while the covered portion can be extracted after hardening.
Solution Approach 2:
The sleeve acts as an intermediary component between the anchor rod and the concrete. It prevents concrete from contacting and embedding the threaded portions of the anchor rod while allowing the anchor rod to be firmly retained through its exposed threaded ends. The sleeve can be removed after concreting, enabling anchor rod extraction.
2Ease of operation
If locking devices are attached to wall formwork before erection, then assembly is simplified and one-sided operation is enabled, but the assembly process becomes more complex requiring precise positioning
Solution Approach 1:
The locking devices are pre-attached to the wall formwork before erection, allowing the anchor rods to be inserted and secured from one side only. This preliminary attachment simplifies the assembly operation during erection but requires careful positioning and alignment of the locking devices on the formwork elements.
3Object-affected harmful factors
If the sleeve completely encases the anchor rod, then concrete flow is fully prevented, but the anchor rod cannot be removed after concreting
Solution Approach 1:
The sleeve provides localized protection only where needed - covering the smooth middle portion of the anchor rod to prevent concrete embedding, while leaving the threaded end portions exposed for concrete engagement and subsequent removal. This selective coverage maintains both retention and removability functions.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for assembling wall formwork and an anchoring system for carrying out the method. The invention also relates to a sleeve of the anchoring system. The method for assembling two wall formworks (12, 13), wherein the two wall formworks (12, 13) have a formwork skin (14) and supporting elements (15) for the formwork skin (14), comprises the following steps: A first locking device (16) is attached to the rear of one of the first wall formworks (13) before this first wall formwork (13) is erected. The first locking device (16) has a pipe section (19) which, in the attached state, extends into the first wall formwork (16) at least as far as the formwork skin (14). The two wall formworks (12, 13) are erected opposite each other. An anchor rod (21) is partially enclosed by a slidably arranged sleeve (11) and can only be partially enclosed.is pushed through anchor rod bores (23) in the two wall forms (12, 13) in such a way that one end of the sleeve (11) rests against the end of the pipe section (19) which extends into the first wall form (13), the pushed-through end of the anchor rod (21) is firmly connected to the first locking device (16), the uninserted end of the anchor rod (21) is firmly connected to a second locking device (24) in such a way that a pipe section (19) of the second locking device (24) extends into the second wall form (12) at least as far as the formwork skin (14) and abuts the sleeve (11).