{"id":5717,"date":"2026-08-05T06:35:41","date_gmt":"2026-08-05T06:35:41","guid":{"rendered":"https:\/\/eurohinca.com\/?p=5717"},"modified":"2026-08-05T06:35:44","modified_gmt":"2026-08-05T06:35:44","slug":"how-to-select-the-strength-class-of-a-driven-pipe-and-the-type-of-joint","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-se-seleccionan-la-clase-resistente-de-una-tuberia-de-hinca-y-el-tipo-de-junta\/","title":{"rendered":"How are the strength class of a driven pipe and the type of joint selected?"},"content":{"rendered":"

The high-strength grade of a driven pipe<\/strong> and the type of joint<\/strong> They are selected based on the anticipated thrusts, the driving length, the diameter, the depth, the geotechnical conditions, the soil-pipe friction, the curvature, the external pressure, the required watertightness, and the pipeline\u2019s operating conditions. The pipe must withstand both temporary construction loads and permanent loads once installed.<\/p>\n\n\n\n

In projects of pipe ramming<\/a>, microtunneling in terrestrial and subway applications<\/a> o infrastructure crossings<\/a>, this decision should not be based solely on the diameter or the end use of the pipeline. It must also take into account how the pipe is driven into the ground, the stresses it is subjected to during installation, and the level of leak tightness the joint must ensure.<\/p>\n\n\n\n

What must a driven pipe be able to withstand?<\/h2>\n\n\n\n

A driven pipe is installed in two distinct phases:<\/p>\n\n\n\n

Phase<\/th>Key Efforts<\/th>What is being verified<\/th><\/tr><\/thead>
Execution<\/td>Longitudinal thrust, friction, point loads, deflections, curvature, and contact pressure<\/td>Axial resistance, joints, distribution rings, cracking, deformation, and driving capacity<\/td><\/tr>
Service<\/td>Soil loads, traffic, external water, internal pressure, durability, and watertightness<\/td>Structural strength, leak tightness, corrosion, abrasion, service life, and maintenance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

For this reason, a pipe that is suitable for hydraulic operation is not always sufficient for pile driving. It must be designed to withstand the stresses of installation without damaging the pipe, the joint, or the lining.<\/p>\n\n\n\n

Factors Affecting the Durable Class<\/h2>\n\n\n\n

The resistance class is defined based on a combination of technical variables:<\/p>\n\n\n\n

1. Expected maximum thrust<\/strong>
The driving force is one of the most important factors. It depends on the length of the section, external friction, lubrication, diameter, geotechnical conditions, depth, and alignment. If the expected driving force is high, a pipe with greater load-bearing capacity or the use of intermediate push stations<\/a>.<\/p>\n\n\n\n

2. Penetration and Friction Lengths<\/strong>
The longer the pipe, the greater the contact area between the pipe and the ground. This increases frictional forces and can affect the pipe\u2019s axial strength, joint design, and lubrication system.<\/p>\n\n\n\n

3. Pipe Diameter and Thickness<\/strong>
The outer diameter determines the contact area, thrust, stiffness, hydraulic capacity, and stability against external loads. The wall thickness affects the structural strength and the ability to withstand driving forces.<\/p>\n\n\n\n

4. Depth and External Loads<\/strong>
The covering, the weight of the soil, and loads from traffic, railways, or nearby structures all affect the strength required throughout the pipeline's service life.<\/p>\n\n\n\n

5. Geotechnical Engineering and the Water Table<\/strong>
Abrasive, heterogeneous terrain containing boulders, rock, sand, gravel, or water can increase thrust forces, wear, external pressure, and sealing requirements.<\/p>\n\n\n\n

6. Curvature and Guidance Tolerances<\/strong>
If the route includes a curve, the pipe and joint must be able to accommodate controlled angular deflections without losing their load-bearing capacity or watertightness.<\/p>\n\n\n\n

7. End Use of the Pipeline<\/strong>
Sewage systems, water supply systems, drainage systems, outfalls, water intake structures, industrial pipelines, or accessible tunnels may require different criteria regarding watertightness, internal pressure, durability, chemical resistance, or maintenance.<\/p>\n\n\n\n

How to Select the Type of Joint<\/h2>\n\n\n\n

The joint must ensure alignment, force transmission, leak tightness, and compatibility with the driving process. Its design depends on the pipe material, diameter, pressure, bend radius, tolerances, and service requirements.<\/p>\n\n\n\n

Criteria Type<\/th>What Is Reviewed<\/th>Impact on the board<\/th><\/tr><\/thead>
Water Tightness<\/td>Internal pressure, external pressure, and water table<\/td>Define elastomers, geometry, and sealing system<\/td><\/tr>
Driving Force<\/td>Axial load transmitted between pipes<\/td>Conditions distribution rings and contact surfaces<\/td><\/tr>
Curvature<\/td>Permissible angular deviation between pipes<\/td>Requires joints compatible with the intended radius<\/td><\/tr>
Durability<\/td>Chemical environments, seawater, wastewater, or corrosive soils<\/td>Materials, Coatings, and Protection<\/td><\/tr>
Tolerances<\/td>Alignment, Manufacturing, and Assembly<\/td>It affects performance during planting and operation<\/td><\/tr>
Maintenance<\/td>Accessibility and End Use<\/td>It may require inspection, repairability, or greater durability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

In driven pipes, it is common to use joint systems with sealing elements and surfaces designed to distribute thrust evenly. When the forces are high, load-distribution rings or equivalent solutions are used to prevent load concentrations and damage to the pipe ends.<\/p>\n\n\n\n

Role of Load-Distribution Rings<\/h2>\n\n\n\n

The distribution rings<\/strong> They help transfer thrust between pipes more evenly. Their function is to reduce stress concentrations, compensate for small tolerances, and protect the pipe ends during driving.<\/p>\n\n\n\n

They are particularly relevant when the following conditions exist:<\/p>\n\n\n\n