Two-Piece Form Insert for Uniform Pipe Pile Passages
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Solution Overview
Problem
Traditional foundation systems face issues with sleeveless concrete footings that require tapered inserts for pipe pile passages, leading to manufacturing complications, binding during curing, and inconsistent passage dimensions, affecting foundation stability and efficiency.
Innovation Solution
A two-piece form insert is used, with symmetrical halves that are offset and tapered to match pipe pile dimensions, allowing easy removal and creating tightly controlled passages, minimizing surface imperfections and friction, and ensuring uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tapered insert is used to create pipe pile passages in pre-cast footings, then the insert can be removed after curing, but the passage dimensions become inconsistent and gaps form between the pipe pile and passage wall
Solution Approach 1:
The insert is divided into two distinct parts: a body portion that defines the passage dimensions and a tapered removal portion that facilitates extraction. This segmentation allows the insert to maintain consistent passage dimensions during curing while enabling easy removal afterward, resolving the contradiction between manufacturing precision and ease of manufacture.
Solution Approach 2:
Instead of making the entire insert tapered to facilitate removal, the invention inverts the approach by making only the removal portion tapered while keeping the body portion cylindrical. This ensures the passage dimensions remain consistent throughout the curing process while still allowing easy removal of the insert after curing.
2Manufacturing precision
If the insert diameter is reduced to match the pipe pile diameter, then the passage fits the pipe pile tightly, but the insert becomes too small to maintain structural integrity during curing
Solution Approach 1:
The insert is segmented into a body portion with full diameter for structural integrity and a removal portion with reduced diameter for easy extraction. This allows the main body to maintain sufficient strength during curing while the reduced-diameter removal portion can be easily pulled out, achieving both passage uniformity and insert strength.
Solution Approach 2:
The insert design transitions from a uniform cylindrical form to a composite form with different diameters along its length. By varying the diameter dimension along the insert's axis, the design achieves both structural integrity in the body portion and ease of removal in the tapered portion, resolving the strength versus precision contradiction.
3Reliability
If the curing time is extended to ensure complete setting, then the foundation stability improves, but the manufacturing productivity decreases
Solution Approach 1:
The insert is designed with a tapered removal portion that facilitates easy extraction once the concrete has reached sufficient curing strength. This preliminary design consideration allows for optimized curing times - long enough to ensure foundation stability but not excessively long - since the insert can be quickly removed after curing, thereby maintaining manufacturing productivity.
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 ensures stable and efficient installation of pipe piles by maintaining precise passage dimensions and reducing manufacturing complexities, enhancing foundation integrity and operational efficiency.
Implementation Method 1
After the concrete has set, the form is opened and the cast footing released and, upon complete curing, is ready to use
Data Source
AI summary
An insert for use in a mold operation to provide internal cavities and passages within a pre-cast structural component. The insert is a multi-piece elongated tube where the individual pieces slide lengthwise to control the effective cross section. In operation in a form used to cast materials such as concrete, the insert creates a selectively dimensioned passage and is easily discharged from the mold/cast structure during or after the concrete is cured.