Geocell Joint Strength via Steel Nail and Polymer Coating
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Solution Overview
Problem
The existing geocell manufacturing methods face issues with inconsistent tensile strength between strips and joints, slit tearing, soil leakage, and corrosion of U-shaped steel nails, leading to reduced binding force and structural instability.
Innovation Solution
The geocell is formed by interconnecting strips with U-shaped steel nails, and each joint is covered with a colloid that completely covers the slits and insert, preventing tearing and leakage while enhancing the structural stability and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strips are interconnected through U-shaped steel nails to achieve consistent tensile strength, then joint strength improves, but slits become prone to tearing and soil leakage
Solution Approach 1:
The patent applies preliminary action by pre-forming the slits in strips at designated locations before insertion of the U-shaped steel nails. This allows for controlled, precise slit formation that minimizes structural weakness while ensuring proper nail insertion. The slits are created with specific dimensions and spacing optimized to prevent tearing during the nail insertion process and subsequent geocell assembly.
Solution Approach 2:
The U-shaped steel nails act as intermediaries that connect adjacent strips without requiring direct slit-to-slit contact. The nails are inserted through aligned slits in adjacent strips and bent to form secure mechanical connections. This intermediary connection method distributes stress away from the slit edges, preventing tear propagation while maintaining slit integrity for soil retention.
2Strength
If U-shaped steel nails are used to connect strips, then tensile strength consistency is achieved, but corrosion occurs in moist soil environments
Solution Approach 1:
The patent employs composite material construction by combining the U-shaped steel nails with polymeric coating layers. The steel nail provides structural strength and mechanical connection, while the polymeric coating (such as polyethylene or polypropylene) provides corrosion resistance in moist soil environments. This composite structure maintains joint tensile strength while protecting against rust and degradation from soil moisture.
Solution Approach 2:
The patent applies parameter changes by modifying the material properties of the steel nails through surface treatment or coating. The nails are treated with corrosion-resistant coatings that change the surface characteristics without significantly affecting the bulk mechanical properties. This allows the nails to maintain their high strength properties while gaining resistance to corrosion from moist soil exposure.
3Ease of operation
If manual tensioning is used to lay geocell at construction site, then installation is simple, but cells have varying shapes and tightness
Solution Approach 1:
The patent applies preliminary action by pre-assembling the geocell structure with precisely spaced slits and pre-positioned U-shaped steel nails during manufacturing. This preconfiguration ensures that when the geocell is deployed and tensioned manually or mechanically, the cells maintain uniform shapes and tightness. The pre-formed connections provide consistent geometric parameters that guide the tensioning process toward uniform cell formation.
Solution Approach 2:
The patent applies parameter changes by optimizing the geometric parameters of the slits and nail configurations during manufacturing. The slit spacing, length, and orientation are precisely controlled to ensure that when tension is applied during installation, the geocell cells achieve uniform dimensions and tightness. This parameter optimization allows manual tensioning to produce consistent results without requiring complex control systems.
Data Source
AI summary
A geogrid and a manufacturing method thereof. The geogrid comprises multiple ribs, and the multiple ribs are connected to each other at multiple junctions to form multiple cells. At each junction, two or more adjacent ribs of the multiple ribs are inserted into each other via inserts, and each junction is covered by a plastic material. The geogrid can easily be extended to a present state at a construction site, prevent tearing of apertures, prevent soil from leaking from the apertures, and prevent the inserts from rusting or corroding. Since the plastic material, the ribs, and the inserts are bonded to each other, separation strength at the junction is markedly increased. Preferably, an end portion of the insert is completely covered by the plastic material to form an end cap, and the plastic material and the ribs and the inserts are bonded to each other to form columns.