Pull Head with Counter-Holding Elements for Pipe Socket Protection
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Solution Overview
Problem
Existing pulling heads for laying underground pipelines face issues with pipes of varying diameters, particularly concrete pipes, which can lead to damage due to alternating lateral loads causing the spigot end to move too deep into the socket connection.
Innovation Solution
A pulling head with a securing ring and counter-holding elements that load the spigot end in a direction opposite to the pulling direction, distributed over the circumference, combined with a rotatable and elastically compressible retaining ring to prevent deep insertion and ensure secure holding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a push-fit socket connection is used to attach the spigot end of the pipe to the pulling head, then the pipe can be securely held for pulling, but the spigot end can move too deep into the socket under alternating lateral loads and become damaged
Solution Approach 1:
The patent applies preliminary anti-action by introducing counter-holding elements that act in advance to prevent the spigot end from moving too deep into the socket. These counter-holding elements are positioned to oppose the harmful movement before it occurs, distributing the lateral loads and preventing the spigot end from striking the socket base, thus protecting the pipe connection during the pulling operation
2Reliability
If holding elements are used to resiliently load the spigot end in the pulling direction, then the pipe can be held securely, but the spigot end can still move excessively under alternating lateral loads
Solution Approach 1:
The patent applies segmentation by dividing the holding function into two distinct sets of elements: holding elements that act in the pulling direction and counter-holding elements that act in the opposite direction. This segmentation allows each set to specialize in preventing movement in its respective direction, providing balanced and stable positioning of the spigot end within the socket while maintaining secure holding
3Device complexity
If a simple socket connection is used, then the device structure remains simple, but it cannot accommodate pipes of varying diameters without damage
Solution Approach 1:
The patent applies dynamics by making the holding and counter-holding elements resilient and capable of independent movement. These elements can adapt their position and loading characteristics based on the pipe diameter and applied loads, allowing the same pulling head structure to accommodate pipes of varying diameters while maintaining secure holding and preventing damage
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
Prevents the spigot end from entering too deeply into the socket, providing enhanced protection against damage and allowing for secure holding of pipes with different diameters, while also deflecting excessive loads through an additional sealing ring.
Implementation Method 1
a rotatable and elastically compressible retaining ring to prevent deep insertion
Implementation Method 2
these holding elements are distributed on the socket over the circumference of a spigot end to be inserted
Data Source
Figure 1~2
Figure 3~4
AI summary
The head (3) has a retaining device (5) for fastening of a traction unit (6), and a sleeve (8) comprising a set of retaining units (9). The retaining units are designed for elastic, permanent loading of an outer surface of a spike end of a pipe in a direction. A retaining ring (12) is connected to the sleeve and has counter retaining units (13) that are arranged at the circumference of the spike end. The counter retaining units are integrated into a holding ring that has an elastically compressible ring that exerts a rotary force on the retaining units or counter retaining units.