Conduit Spacer Tapered Interlock Vertical Stacking
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Solution Overview
Problem
Existing conduit spacers for underground duct banks are difficult to assemble reliably and require expensive tooling with tight tolerances, leading to inefficient and time-consuming installation, especially when dealing with multiple vertical layers of conduits.
Innovation Solution
The design of conduit spacers with planar bases, convex portions, and U-shaped bodies featuring tapered stacking slots and tabs allows for easy assembly and interlocking, eliminating the need for precise tooling, enabling secure and efficient stacking and filling with concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snap-fit joints are used for vertical interlocks in conduit spacers, then the spacers can be assembled together, but the tooling requires very tight tolerances and the joints may interfere with assembly
Solution Approach 1:
The spacer is divided into functional segments: a base portion for conduit support and a stacking portion for interconnection. This segmentation allows each part to be optimized independently - the base provides structural support while the stacking portion with tapered slots and tabs enables easy assembly without tight tolerances.
Solution Approach 2:
The invention changes the geometric parameters of the interlocking mechanism from snap-fit joints requiring tight tolerances to tapered slots and tabs. The tapered geometry (wider at one end, narrower at the other) provides a tolerance buffer that facilitates easy assembly while maintaining reliable connection.
2Adaptability or versatility
If multiple vertical layers of conduits are installed using removable spacers, then conduits can be separated, but the process becomes very inefficient and time-consuming
Solution Approach 1:
The spacers are pre-assembled into stacked configurations with conduits already positioned in the base portions before installation. This preliminary assembly in the factory allows for precise conduit spacing and positioning, which then translates to rapid field installation without time-consuming on-site adjustments.
Solution Approach 2:
Multiple spacer units with conduits are combined into a single stacked assembly that installs as one unit. The tapered stacking slots and tabs enable these pre-assembled units to be quickly connected vertically, merging multiple installation operations into a single efficient process.
3Ease of operation
If spacers with large teeth in rake form are used to separate conduits, then conduits can be organized and separated, but maintaining vertical separation is challenging
Solution Approach 1:
The spacer is segmented into a base portion that provides horizontal conduit separation and a stacking portion that provides vertical connection. This segmentation allows the base to maintain stable vertical separation through its structured design with planar portions and convex portions, while the stacking portion enables reliable vertical assembly.
4Ease of manufacture
If spacers are assembled by placing conduits into bores in a first layer and adding additional spacers and conduit atop, then duct banks can be built, but the assembly is not sturdy and lacks reliable interlocking
Solution Approach 1:
The invention adds a tapered geometric dimension to the stacking slots and tabs. The taper provides mechanical advantage that transforms a simple insertion operation into a strong, interlocked connection. This dimensional feature enables the assembly to achieve both ease of manufacture and high strength.
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 provides a robust, easy-to-assemble conduit spacer system that ensures tight, coherent duct banks with improved thermal conductivity and protection, reducing installation time and costs while maintaining structural integrity.
Implementation Method 1
The concrete provides a heat transfer medium for conducting heat to the surface, normally the ground surface
Data Source
AI summary
Conduit spacers useful in preparing duct banks are disclosed. The conduit spacers are designed for attachment to each other in vertical and horizontal combinations, that is, they may be arranged in side-by-side arrays, up-and-down arrays, or arrays that are both side-to-side and up-and-down. Thus, the conduit spacers include both vertical and horizontal restraints or interlocks. The vertical interlocks are achieved by the use of tapered tabs and tapered slots, both the tabs and the slots having tapers in the same horizontal direction. Horizontal interlocks are made by the use of rails and matching grooves in the sides of the spacers. Thus, both vertical and horizontal interlocks are achieved by assembling the ducts in a horizontal direction, side-by-side as desired for width, and up-and-down as desired for height. The number and length of conduits and the length of the duct banks needed dictate how many spacers are needed.