Underpinning Techniques and their Applications in Strengthening of Different Types of Existing Foundations - Course S01-014 - Credit 1 PDH

Oct 24, 2026

Upload by Jiven

Underpinning methods, procedures, and their applications are presented for strengthening and repairing existing building foundations. The course explains underpinning as a technique for restoring structural stability when foundation or footing failures occur unexpectedly after completion of substructure and superstructure. It covers the installation of permanent or temporary support to increase depth and bearing capacity, and outlines selection of methods, structural conditions requiring underpinning, purpose and need, plus common approaches such as pit, pile, wall and column underpinning.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages18

Reading Time45 min

AccessFree to download

Introduction

What Is Underpinning?

Selection of Underpinning Methods

Structural Conditions Which Requires Underpinning

Purpose of Underpinning

Need for Underpinning

Necessity of Underpinning Foundation

Methods of Underpinning

Advantages of Underpinning

Disadvantages of Underpinning

Conclusion

References

| | | --- | | Underpinning Techniques and their Applications in Strengthening of Different Types of Existing Foundations
Course No: S01-014
Credit: 1 PDH | |
Ibrahim M. Metwally, Ph.D., P.E. | |

Continuing Education and Development, Inc.
P: (877) 322-5800
[info@cedengineering.com](info@cedengineering.com) | Table of Contents Introduction ................................................................................................................................ 1 What Is Underpinning? ............................................................................................................... 1 Selection of Underpinning Methods ........................................................................................... 2 Types of works for selection of underpinning methods.............................................................. 2 Conversion Works................................................................................................................... 2 Protection Works .................................................................................................................... 2 Remedial Works...................................................................................................................... 2 Structural Conditions Which Requires Underpinning ................................................................. 2 Purpose of Underpinning............................................................................................................ 3 Need for Underpinning ............................................................................................................... 3 Necessity of Underpinning Foundation ...................................................................................... 3 Methods of Underpinning ..........................................................................................................4 Pit method .............................................................................................................................. 4 Pile method ............................................................................................................................ 6 Underpinning to walls............................................................................................................. 7 Jack pile underpinning ............................................................................................................ 8 Needle and pile underpinning................................................................................................. 9 ‘Pynford’ Stool method of underpinning .............................................................................. 10 Root pile or angle Piling ........................................................................................................ 11 Underpinning columns.......................................................................................................... 12 Advantages of Underpinning .................................................................................................... 13 Disadvantages of Underpinning ................................................................................................ 14 Conclusion ................................................................................................................................ 14 References ................................................................................................................................ 15 List of Figures Figure 1. Underpinning Methods, Procedure, use in Foundation Strengthening and repair ...... 1 Figure 2.Pit Method of Underpinning .........................................................................................4 Figure 3. Pit Method of Underpinning with Cantilever needle ................................................... 5 Figure 4. Pile Method of Underpinning...................

FAQs

What is underpinning and why is it used?

Underpinning is a method for repairing and strengthening building foundations. It installs permanent or temporary support to increase depth and bearing capacity, helping regain structural stability when failures occur.

When should underpinning be considered for existing foundations?

It is required in situations where foundation or footing failure happens unexpectedly after the structure is completed. The course also discusses structural conditions that require underpinning.

What underpinning methods are covered?

The course covers pit and pile methods, underpinning to walls, jack pile and needle-and-pile techniques, the Pynford stool method, root pile or angle piling, and underpinning columns.

Oct 24, 2026

Upload by Jiven