Cylindrical Pile Conical Thread Self-Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing screw joint pile designs for construction piles face challenges in achieving quick and reliable installation, especially in dirty environments, while maintaining strength and durability over long periods, including corrosion and ground movements.
Innovation Solution
A cylindrical pile element with a conical thread configuration, featuring side flanks inclined at specific angles, allows for efficient engagement with a sleeve element, providing a strong and reliable connection even in uncontrolled, dirty conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional screw joints are used for pile elements, then installation speed is improved, but reliability and strength under long-term loads deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the thread flank angles to specific ranges (15°-25° for the pin end side flank, 6°-8° for the box end side flank) and the thread taper angle (1°-5°). These parameter optimizations simultaneously achieve quick installation through controlled self-alignment while ensuring joint strength and reliability under long-term axial and bending loads, resolving the contradiction between installation speed and joint reliability.
2Ease of operation
If conventional screw joints are used for pile elements, then installation quickness is improved, but resistance to thread intertangling in dirty environments deteriorates
Solution Approach 1:
The patent applies preliminary action through the self-aligning property provided by the conical thread configuration with specific taper angles (1°-5°). This preliminary alignment action occurs automatically when threads are engaged, guiding them into proper alignment before full engagement, which prevents intertangling even in dirty environments without requiring additional alignment steps or tools.
Solution Approach 2:
The specific thread geometry parameters (side flank angles of 15°-25° and 6°-8°, taper angle of 1°-5°) create a self-aligning mechanism that automatically guides threads into proper engagement position, preventing intertangling caused by dirt or misalignment during manual installation.
3Strength
If stronger joints are designed to meet reliability requirements, then long-term strength is improved, but installation time increases
Solution Approach 1:
The patent optimizes thread geometry parameters (side flank angles and taper angle) to achieve a balance where the joint provides sufficient strength under axial compression, axial tension, and bending forces while maintaining quick installation through self-aligning properties, eliminating the need for time-consuming alignment procedures.
Solution Approach 2:
The asymmetric thread configuration with different side flank angles (15°-25° on the pin end side, 6°-8° on the box end side) creates a self-aligning mechanism that guides threads into proper engagement, enabling both quick installation and high joint strength without compromising either requirement.
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
Cylindrical pile element (10) with a longitudinal axis (V), for use as a reinforcing or supporting construction element, having a cross-sectional cylinder diameter of at least 70 mm, being arranged to be lengthwise extendable using a cylindrical sleeve element (20), using a male pile element thread comprised in a pin end (11) of the said pile element and arranged to engage with a corresponding female sleeve element thread comprised in the said sleeve element at a respective box end (21) of the sleeve element, which pile element thread is generally tapered. The invention is characterised in that the side flank of the pile element thread facing towards the pin end is inclined between 15° and 25° in relation to a plane perpendicular to the longitudinal axis, and in that the side flank facing away from the pin end is inclined between 6° and 8° in relation to said plane.