Segmented Hollow Mandrel for Drainage Ribbon Installation
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Solution Overview
Problem
The existing methods for introducing drainage ribbons into subsoil require frequent replacement of the entire mandrel due to wear, leading to premature decommissioning and increased costs, as replacing the mandrel is impractical and time-consuming.
Innovation Solution
A mandrel arrangement with a permanent section and a replaceable section, where the replaceable section can be easily detached and replaced without removing the push bar, allowing for quick swapping during operations, optimizing the mandrel's technical lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire mandrel is replaced when the bottom end wears out, then the reliability of the drainage installation is maintained, but the loss of time and productivity decrease significantly due to the complex replacement operation requiring multiple working days
Solution Approach 1:
The mandrel is divided into two distinct segments: a permanent upper section that remains with the king post and a replaceable lower section that can be quickly exchanged. This segmentation allows the replaceable section to be swapped independently without affecting the entire mandrel system, thereby maintaining reliability while significantly improving productivity during replacement operations.
2Duration of action of stationary object
If the entire mandrel is replaced when worn, then the technical lifetime is reset, but the loss of time increases due to drawing out the push bar requiring horizontal king post positioning
Solution Approach 1:
By segmenting the mandrel into permanent and replaceable sections, the replacement operation is simplified to only涉及 the lower section. This eliminates the need to draw out the entire push bar and reposition the king post horizontally, reducing replacement time while still extending the overall system's technical lifetime through section replacement.
Solution Approach 2:
The replaceable lower section is designed to be extracted and replaced independently from the permanent upper section. This extraction principle allows the worn section to be removed and replaced without affecting the rest of the mandrel system, significantly reducing the time loss associated with full mandrel replacement.
3Ease of operation
If mandrels with well enough reserve are employed to avoid replacement, then the ease of operation is maintained, but the loss of substance increases as mandrels are decommissioned before technical lifetime passes
Solution Approach 1:
The segmentation of the mandrel allows the permanent upper section to be reused across multiple projects while only the lower wear-prone section is replaced. This maximizes material utilization by keeping the majority of the mandrel in service indefinitely, reducing substance loss while maintaining operational continuity.
Solution Approach 2:
Instead of discarding the entire mandrel when the bottom wears out, the invention recovers the permanent upper section for continued use. Only the replaceable lower section is discarded, significantly reducing material loss while maintaining ease of operation through the availability of replacement sections.
4Ease of repair
If the push bar is drawn out of the entire mandrel for replacement, then the replacement can be performed, but the device complexity increases due to the requirement of horizontal king post positioning
Solution Approach 1:
Segmenting the mandrel into permanent and replaceable sections simplifies the repair process. The replaceable section can be exchanged without requiring the complex horizontal positioning of the king post, making the repair easier while reducing operational complexity.
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
Enables efficient and rapid replacement of worn-out sections during projects, extending the mandrel's lifespan and reducing costs by allowing on-site replacement without needing multiple mandrels for each project.
Implementation Method 1
a spring that biases the push bar towards its extended position
Implementation Method 2
the mandrel drive comprises an hydraulic drive cylinder that is mounted to the first mandrel profile
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
The invention relates to an arrangement for vertically introducing drainage ribbons into a subsoil, comprising an hollow mandrel and a drainage ribbon that is fed through the mandrel, wherein the mandrel comprises a permanent section with a first elongate mandrel profile and a mandrel drive, and a replacement section at the end of the mandrel, wherein the replacement section comprises a second elongate mandrel profile that is joint with the end of the first mandrel profile by means of a weld, a bottom face at the bottom end of the second mandrel profile, and a push bar and a spring that biases the push bar towards its extended position with respect to the bottom face, wherein the mandrel drive comprises a drive cable that extends through the hollow mandrel and that is at one end operatively connected with the push bar by means of a releasable coupling.