One-Sided Formwork Anchor With Cladding Tube
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Solution Overview
Problem
Existing formwork anchors require accessibility to both sides of formwork elements for connection, making one-sided anchoring challenging, especially when dealing with fresh concrete pressure during concreting.
Innovation Solution
A formwork anchor system featuring a Dywidag rod with a special interrupted thread, an anchor head, and abutments that allows for one-sided attachment and adjustment, using a cladding tube to prevent concrete contact and facilitate easy removal after concreting, with seals to prevent concrete leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional anchors are used to connect two formwork elements, then the formwork elements can be securely connected, but accessibility to both outer sides of the formwork elements is required which complicates the anchoring process
Solution Approach 1:
The anchor rod is inserted from the inner side of the formwork element rather than from the outer side. The anchoring operation is inverted by performing it from the accessible inner side while the anchor head engages with the formwork element on the opposite outer side, eliminating the need to access both outer sides.
Solution Approach 2:
The anchor rod acts as an intermediary element that transfers the connection force from the inner side (where operation is performed) to the outer side (where the anchor head engages with the formwork element). This mediator enables one-sided operation while maintaining secure connection.
2Strength
If the anchor rod is directly exposed to concrete during concreting, then the anchor can be securely connected to the formwork element, but the anchor becomes embedded in the concrete making removal difficult
Solution Approach 1:
The anchor rod is extracted from direct contact with the concrete by routing it through a formwork element. Only the anchor head remains exposed on the outer side, while the rod itself is protected within the formwork structure, preventing concrete embedding and facilitating easy removal.
Solution Approach 2:
The formwork element serves as a disposable protective barrier that allows the anchor rod to pass through without being embedded in concrete. The formwork element is removed after concreting, taking no damage to the concrete structure, while the anchor rod remains intact for removal.
3Length of stationary object
If the anchor rod is made long to span the distance between formwork elements, then the connection is achieved, but the anchor rod becomes more prone to concrete contact and embedding
Solution Approach 1:
The anchor rod is routed through the thickness dimension of the formwork element rather than spanning the horizontal distance between elements. This dimensional change shortens the exposed length of the rod and directs it through a protected path, reducing concrete contact while maintaining connection effectiveness.
Data Source
AI summary
For one-sided anchoring of two shell elements (1), the invention proposes an anchor (2) with an anchor rod (6) having a thread and an anchor head (7) that is rotationally fixed to the anchor rod (6) for a rotary drive of the anchor (2). A first abutment (17) is arranged on the anchor rod (6) at a fixed distance from the anchor head (7). A sheathing tube (18), which can be arranged on the anchor rod (6), is supported against this abutment. At the other end of the sheathing tube, a sleeve is arranged as a second abutment (19) for a shell element (1) located farther from the anchor head (7). The invention enables one-sided anchoring.