Formwork Anchor Locking Device for Concrete Leakage Prevention
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Solution Overview
Problem
In existing concrete wall formwork anchor systems, misalignment of anchor rods during construction leads to excessive stress on sealing elements, causing concrete leakage and potential damage, due to the asymmetrical pressure load and punctiform force transmission.
Innovation Solution
A locking device with a rubber-elastic inner sealing ring and a tubular guide device that distributes pressure loads and prevents leakage, featuring a metal sleeve for protection and a radially encircling widening for defined positioning, along with an anti-twist device to prevent rotation and ensure secure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anchor rod is passed through misaligned anchor passage bores, then the ease of operation is improved (the anchor rod can be inserted without precise alignment), but the sealing element is subjected to excessive stress causing concrete leakage
Solution Approach 1:
The sealing element uses a flexible membrane structure that can deform to accommodate misaligned anchor rods while maintaining the sealing function. The flexible film adapts to the inclined position of the anchor rod, preventing concrete leakage even when the anchor passage bores are not perfectly aligned.
Solution Approach 2:
The sealing element is designed with variable geometric parameters, including an angled configuration that can match the inclination of misaligned anchor rods. By changing the orientation parameter of the sealing element to match the anchor rod angle, the system maintains sealing effectiveness while accommodating ease of insertion.
2Ease of operation
If the anchor rod is positioned at an angle to the formwork skin, then the ease of operation is improved (the anchor rod can be inserted from outside without visibility), but the locking device is no longer completely flush with the formwork element causing punctiform force transmission
Solution Approach 1:
The solution transitions from a two-dimensional flush mounting to a three-dimensional angled configuration. The locking device and sealing element are designed to accommodate the anchor rod in an inclined position, distributing forces across a larger area in multiple dimensions rather than concentrating them at a single punctiform contact point.
Solution Approach 2:
The sealing element and locking device are pre-configured with an angled geometry that anticipates the misalignment of anchor passage bores. This preliminary angular configuration ensures that when the anchor rod is inserted, the forces are already distributed appropriately, preventing punctiform stress concentration.
3Strength
If a rigid sealing element is used, then the strength is improved (the sealing element can withstand high pressure), but the sealing element is more susceptible to damage from asymmetrical pressure load
Solution Approach 1:
The sealing element employs a flexible membrane design that can deform under asymmetrical pressure loads without suffering damage. This flexibility allows the sealing element to adapt to the inclined anchor rod position and distribute stresses evenly, preventing the damage that would occur with a rigid sealing element subjected to the same asymmetrical loading.
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 solution effectively prevents concrete leakage and reduces the risk of sealing element damage by distributing pressure loads and ensuring secure sealing, even when anchor rods are not perfectly aligned, maintaining the integrity of the concrete wall formwork.
Implementation Method 1
The sealing element has a rubber-elastic or tough-elastic inner sealing ring
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention relates to a locking device 21 for an anchor bar 2 of an anchor system of a concrete wall formwork, having a formwork element 6 comprising a formwork facing 7, having an annular sealing element 15 for sealing off an anchor penetration hole 13 in the formwork facing 7, a threaded nut element 24 for threading the anchor bar 2 into a threaded nut thread of the threaded nut element 24, and a cap plate 27 that can be fastened by means of fastening means 30 to a rear face of the formwork element 6 of the concrete wall formwork and comprises a spherically designed plate region having an opening in which the threaded nut element 24 is disposed having radial clearance, wherein the threaded nut element 24 comprises a groove-like radially circumferential receptacle 40 in which the edges of the opening in the spherical plate region are received, and wherein a tubular guiding device 45 flush with the threaded nut thread of the threaded nut element 24 is provided on the end of the threaded nut element 24 to be located at the concrete formwork side. The sealing element 15 thereby comprises an elastic rubber inner sealing ring 46 and the free end 51 of the guiding device 45 to be located at the formwork element side is sealingly inserted with the inner sealing ring 46 into the sealing element 15.