Threaded Pile Pipe Joint With Negative Play for Higher Strength
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Solution Overview
Problem
Existing pipe section connections, particularly those using screw threads, introduce weak points in the structure, limiting the strength and durability of the pipe constructed from these sections.
Innovation Solution
The design incorporates a screw thread connection with substantial negative play, resulting in increased wall thickness of at least 5% compared to the middle part of the pipe sections, leading to plastic deformation and enhanced engagement of the threads, thereby increasing the strength of the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a screw thread connection is used to connect pipe sections, then the pipe can be assembled from multiple sections, but the connection introduces a weak location that reduces the overall strength of the pipe
Solution Approach 1:
The patent applies local quality by creating a localized thickened region at the screw thread connection zone. The negative play design causes material deformation that concentrates and thickens the wall specifically at the connection interface, making this local area stronger than the standard pipe wall thickness to compensate for the inherent weakness of the threaded joint.
Solution Approach 2:
The patent changes the geometric parameter of wall thickness dynamically through the negative play mechanism. During assembly, the initial negative clearance allows the threads to engage, and subsequent tightening causes plastic deformation that increases the effective wall thickness at the connection zone, transforming the weak thin-walled joint into a stronger connection.
2Loss of substance
If the wall thickness of pipe sections is reduced to save material, then material usage and costs decrease, but the strength of the screw thread connection becomes even weaker
Solution Approach 1:
Instead of uniformly thickening the entire pipe wall, the patent applies local quality by concentrating the thickened region specifically at the screw thread connection zone. The negative play design ensures that material deformation and thickening occur locally where needed for connection strength, while the rest of the pipe maintains its thin-walled design for material efficiency.
Solution Approach 2:
The patent segments the pipe wall thickness property, creating a differentiated structure where the connection zone has increased thickness while the middle sections maintain standard thin wall thickness. This segmentation allows optimization of material distribution - thicker where structural integrity is critical and thinner where it is not needed.
3Strength
If the screw thread connection is designed with negative play to increase wall thickness, then the strength of the connection improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-designing the negative play clearance into the thread geometry before assembly. This predetermined clearance ensures that during the tightening process, the threads will naturally deform and engage with the intended interference fit, guiding the assembly process and reducing the need for high-precision manual adjustment while achieving the desired thickened connection zone.
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 enhances the overall strength of the pipe, allowing for the use of thinner pipe sections while maintaining strength, reducing material usage and costs, and enabling the pipe to withstand rotational forces without failure.
Implementation Method 1
screwing of the outer screw thread into the inner screw thread to the desired depth has been reached, due to the negative play, will lead to stresses above the yield point of the material and, as a result, in plastic deformation of the inner screw thread, the outer screw thread and the inner surface and/or the outer surface
Data Source
Figure 1~2
Figure 3
Figure 4~5a(B)
AI summary
The present invention provides a combination of a thin-walled first pipe section and a thin-walled second pipe section configured to be connected to each other to form a pipe using a conical screw thread connection, wherein the screw thread connection is formed by an inner screw thread arranged at an inner surface provided at a first end of the first pipe section, and an outer screw thread arranged at an outer surface provided at a second end of the second pipe section. The invention is characterized in that the inner screw thread and the outer screw thread are designed to have a negative play with respect to each other, such that screwing the inner screw thread and the outer screw thread in each other results in an increased wall thickness at the screw thread connection, for example at least 5 %, with respect to the wall thickness in a middle part of the first pipe section and the second pipe section.