Wedge Spacer Assembly for Concrete Formwork Alignment
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Solution Overview
Problem
Existing spacer arrangements for connecting reinforcing bars in concrete construction are inadequate, leading to inaccurate positioning and potential slippage, and require multiple sizes to be stocked and selected on-site, complicating installation.
Innovation Solution
A two-part spacer assembly comprising a holder and a wedge with a conical front end, allowing for automatic alignment and secure attachment to reinforcing bars of varying diameters without needing prior selection, using a wedge that slides into recesses in the holder for a linear connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge is driven into a U-shaped holder to connect the spacer rod to the connecting iron, then the spacer rod can be attached to the connecting iron, but the connection is inadequate and can lead to inaccurate positioning of walls, and the spacer rod can slip out of the holder
Solution Approach 1:
The connection system is divided into distinct functional segments: the holder with U-shaped cross-section that wraps around the connecting iron, the wedge that provides clamping force, and the spacer rod that maintains distance. This segmentation allows each component to be optimized for its specific function, ensuring both reliability and positioning accuracy.
Solution Approach 2:
The holder and wedge are combined into a single integrated assembly that is inserted as one unit. The holder is designed with a U-shaped cross-section that partially wraps around the connecting iron, and the wedge is integrated within the holder structure, merging the positioning and clamping functions into a unified connection system.
2Adaptability or versatility
If multiple differently designed clamping devices are kept in stock for different diameters of connecting irons, then connecting irons of different thicknesses can be accommodated, but the device complexity increases and requires selection by the construction worker
Solution Approach 1:
The holder is designed with a U-shaped cross-section and adjustable geometry that allows it to accommodate connecting irons of various diameters (6 mm to 21 mm) with a single design. The holder can be positioned laterally against the connecting iron and wrapped around it, adapting to different sizes without requiring multiple specialized clamping devices.
Solution Approach 2:
The holder is designed with flexible positioning capability, allowing it to be adjusted laterally against the connecting iron. This dynamic adjustment capability enables the same holder design to adapt to different diameters of connecting irons, eliminating the need for multiple fixed-size clamping devices.
3Stability of the object's composition
If the spacer rod is inserted into holes in the holder and permanently connected, then the connection is stable, but the spacer rod cannot slide into a cutout on its own, requiring different design assumptions
Solution Approach 1:
The holder is pre-formed with a U-shaped cross-section and appropriate geometry that guides the spacer rod into position. The holder is designed in advance to accommodate the spacer rod and connecting iron, with pre-positioned features that facilitate automatic alignment and insertion during installation.
Solution Approach 2:
The spacer rod is designed to slide automatically into the holder's cutout during installation without requiring additional components or complex assembly steps. The holder's geometry and the spacer rod's dimensions are coordinated so that the spacer rod self-aligns and self-inserts into the correct position, achieving both stability and ease of operation.
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
Ensures precise and reliable attachment of spacers to reinforcing bars, preventing rotation and slippage, while allowing for cost-effective and easy installation without needing multiple sizes, ensuring optimal clamping force and alignment.
Implementation Method 1
A two-part spacer assembly comprising a holder and a wedge with a conical front end, allowing for automatic alignment and secure attachment to reinforcing bars of varying diameters
Implementation Method 2
using a wedge that slides into recesses in the holder for a linear connection
Implementation Method 3
ensuring optimal clamping force and alignment
Data Source
Figure 1~4
Figure 5a~5c
Figure 6a~6c\
AI summary
The spacer arrangement (1) for determining the mutual distance of formwork during the production of concrete structures comprises a holder (9) and a wedge (7) on which the spacer rod (3) is held in semicircular rings (21). The holder (9) has stepped recesses (39) into which the spacer rod (3) can only be inserted in the correct orientation.