Friction Collar Piling Attachment via Hydraulic Expansion
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Solution Overview
Problem
The existing methods for attaching friction collars to pilings require labor-intensive welding, which can be faulty and increase costs, and there is a need for a secure and cost-effective installation method that does not rely on welding.
Innovation Solution
A friction collar system that uses a cone-shaped die or tapered object to expand the piling outward, securing the collar without welding, and incorporates a hydraulic press with a form punch and securing mechanisms like a tube retaining bracket and bottom alignment ring to ensure secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to attach the friction collar to the piling, then the collar can be securely attached, but the labor cost increases and the risk of faulty attachment increases
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical expansion system. A conical die is inserted into the piling and hydraulic pressure is applied to expand the piling radially outward, creating a friction fit that secures the collar without any welding. This substitution eliminates the complexity and reliability issues associated with welding while maintaining secure attachment.
Solution Approach 2:
The patent employs a hydraulic press to generate the expanding force needed to secure the collar. Hydraulic fluid is pumped into a chamber where it acts on a plunger that pushes the conical die into the piling. The hydraulic system provides controlled, high-force expansion of the piling, creating a reliable friction fit between the expanded piling and the inner surface of the collar without requiring welding operations.
2Reliability
If welding is used to attach the friction collar, then secure attachment can be achieved, but labor time and costs increase
Solution Approach 1:
The hydraulic expansion system replaces the multi-step welding process with a single rapid expansion operation. The collar is positioned over the piling, hydraulic pressure is applied to expand the piling, and the collar is immediately secured through friction. This eliminates the time-consuming welding operations, cleaning, and inspection steps, dramatically increasing installation productivity while maintaining attachment security.
Solution Approach 2:
The piling serves its own attachment function by expanding under hydraulic pressure to create the friction fit. The material of the piling itself becomes the securing mechanism, eliminating the need for external welding operations. This self-service approach where the piling's own material properties are utilized for attachment significantly reduces labor time and costs.
3Productivity
If a friction collar is installed to eliminate side friction, then piling installation efficiency improves, but the complexity of securing the collar increases due to welding requirements
Solution Approach 1:
The patent replaces the complex welding attachment system with a simple hydraulic expansion system. The collar design incorporates an inner surface with a specific profile that interfaces with the expanding piling. When the piling is expanded hydraulically, it automatically creates a friction fit against this profile, securing the collar without any complex welding fixtures or procedures. This simplifies the overall attachment system while maintaining the productivity benefits of friction collar installation.
Solution Approach 2:
The patent changes the physical parameter of the piling (its radial dimension) through hydraulic expansion. By temporarily increasing the radial dimension of the piling during installation, the system creates a friction fit that secures the collar. After expansion, the piling retains a slightly larger diameter that maintains the friction connection. This parameter change provides a simple, welding-free attachment method that maintains installation efficiency.
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
This method allows for secure, on-site installation of friction collars without welding, reducing labor costs and ensuring the collar remains firmly attached during piling installation, thereby enhancing the stability and efficiency of the piling process.
Implementation Method 1
A friction collar system that uses a cone-shaped die or tapered object to expand the piling outward, securing the collar without welding, and incorporates a hydraulic press with a form punch
Implementation Method 2
A friction collar system that uses a cone-shaped die or tapered object to expand the piling outward, securing the collar without welding
Data Source
AI summary
The system, method and apparatus for installing a piling generally includes a hollow piling having an inner surface and an outer surface with the piling having a lower end with a friction collar secured about the lower end. The friction collar is manufactured to have an inner surface wherein the inner surface includes portions with various diameters. The friction collar is placed over the lower end of the piling such that the lower end of the piling is aligned with an intermediate portion of the inner surface of the friction collar. A tapered die is pressed into the bottom of the piling to expand the lower end of the piling outwardly such that it extends into the intermediate portion of the friction collar. This secures the friction collar to the end of the piling. Optionally, an end cap may be placed over the piling and/or friction collar.