Caisson Side Tabs for Single-Hammer Installation
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Solution Overview
Problem
The current process for installing earth-supported hollow piles (caissons) is labor-intensive and time-consuming, requiring separate equipment and repositioning of vibratory hammers for each caisson, which increases installation time and cost in construction projects like high-voltage electrical transmission lines.
Innovation Solution
The integration of side tabs on caissons allows vibratory forces to be transferred from an offset position, enabling the caisson to be both positioned and driven into the ground using a single vibratory hammer, eliminating the need for separate equipment and reducing labor, with a preinstalled protective cap for permanent attachment after installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a protective cap is installed on the caisson and a crane is used to position it, then the caisson can be positioned and driven into the ground, but the process requires multiple pieces of equipment (crane, vibratory hammer) and sequential operations, increasing installation time and labor
Solution Approach 1:
The patent combines the positioning and driving functions into a single vibratory hammer operation. The vibratory hammer is designed to both position the caisson on the ground and drive it into the earth, eliminating the need for separate crane positioning and subsequent driving operations. This merging of functions directly reduces equipment complexity and installation time.
Solution Approach 2:
The vibratory hammer is designed with multi-functionality to perform both positioning and driving operations. By making the vibratory hammer capable of both functions, the patent eliminates the need for specialized positioning equipment like cranes, thereby reducing the number of equipment pieces required while maintaining installation effectiveness.
2Ease of operation
If separate equipment is used for positioning and driving the caisson, then each operation can be performed with dedicated equipment, but the installation process becomes more labor-intensive and time-consuming
Solution Approach 1:
The patent merges positioning and driving operations into a single continuous process using one piece of equipment. The vibratory hammer performs both functions without requiring equipment changes or repositioning, simplifying the operational sequence and reducing the time lost during equipment transitions and repositioning.
Solution Approach 2:
The caisson is designed with side tabs that extend from its body, which are specifically configured to be engaged by the vibratory hammer for positioning. This preliminary design feature enables the vibratory hammer to directly position the caisson without requiring separate positioning equipment, thereby simplifying the overall process and reducing installation time.
3Manufacturing precision
If the vibratory hammer is repositioned for each caisson, then precise positioning can be achieved, but the installation time increases due to repeated repositioning operations
Solution Approach 1:
The caisson's side tabs are designed to automatically engage with the vibratory hammer's clamping mechanism. This self-aligning feature eliminates the need for manual repositioning of the vibratory hammer between caissons, as the tabs guide the hammer into the correct position automatically, thereby maintaining positioning accuracy while reducing repositioning time.
Solution Approach 2:
The side tabs are pre-configured on the caisson in specific positions and orientations that anticipate the vibratory hammer's approach. This preliminary arrangement ensures that the hammer can quickly and accurately engage the caisson without requiring complex repositioning operations, thus maintaining precision while minimizing time loss.
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 approach significantly reduces installation time and labor by allowing the caisson to be positioned and driven using a single vibratory hammer, simplifying the process and eliminating the need for repositioning, while ensuring secure and efficient placement of caissons.
Implementation Method 1
The vibratory hammers have internal eccentric weights, for example, driven by a hydraulic motor and have a hydraulic clamp that may clamp the vibratory hammer tightly to the protective cap and caisson to directly couple forces from the vibratory hammer into the caisson walls
Implementation Method 2
The vibratory hammers have internal eccentric weights, for example, driven by a hydraulic motor
Implementation Method 3
This weight is coupled to the vibratory hammer with an asymmetric elastomeric coupling that promotes high downward forces yet attenuated upward forces so that the net progress of the caisson moves downward during vibration
Implementation Method 4
an asymmetric elastomeric coupling that promotes high downward forces yet attenuated upward forces
Implementation Method 5
properly designed side tabs can be added to large caissons to permit vibratory forces to be effectively transferred from an offset position to a side of the caisson through the tabs into the caisson
Implementation Method 6
have a hydraulic clamp that may clamp the vibratory hammer tightly to the protective cap and caisson to directly couple forces from the vibratory hammer into the caisson walls
Data Source
AI summary
A caisson is modified to include side tabs thin can be gripped by side-mounted clamps on a vibratory hammer so that the caisson may be lifted into position from a horizontal position, oriented vertically, and driven into the ground without readjustment of the clamping of the vibratory hammer. An end cap installed permanently at the top of the caisson may provide an additional flange for receiving a lower clamp of the vibratory hammer to complete installation of the caisson, driving the caisson further into the earth until the tabs are buried in the ground. The flange may be sized to fit within a tower portion attached to the caisson eliminating the need for a replaceable flange system.