Distance - Helical (Screw) Piles Foundation System Design Workshop (1.2 CEUs)

Course Code: CVL094d

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Looking for professional development but do not have the time to take off from work?
Looking for refresher course on specific engineering topics and cannot find an intensive course to serve your needs?
This may be your ideal Professional Development course!

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Duration:

This course is approximately 3 weeks in duration.

Learning Method:

The PDDP program is more of a self-guided learning style.
You are required to read the notes and materials given, complete the follow-up assignments on your own, send in your questions prior to your 1 hour webinar meeting (if required) and be involved in live discussion via the internet.
Once you have completed the course, you will receive a certificate of completion

Description

Helical foundation systems offer a versatile replacement of conventional deep foundations solutions. The most important differences between the helical foundations and the conventional foundation types are mainly in method of construction. Helical piles need much less construction time and could be used or loaded immediately. Helical piles could be used where conventional deep foundation cannot. Underpinning is the best example of these unique differences. This course will focus on the design, construction and field acceptance criteria’s for the helical (screw piles). The course notes, lectures and hands on design examples will compose a comprehensive reference for the state of knowledge and guidance for future use.

The fundamental mechanisms by which helical piles develop resistance to load are described in a manner consistent with basic principles of soil mechanics. Along with the thorough description of installation methods and equipment that is provided, the concepts used for design and quality control/quality assurance follow logically. The section on corrosion and life expectancy is particularly important now as applications of helical piles expand into greater use with permanent structures with longer intended service periods. Applications for helical piles are described which may prove novel to many engineers and open opportunities for innovation and development of more cost-effective solutions.

After Attending this course you will be able to:

Determine screw pile carrying capacity
Select best screw pile type for your projects
Evaluate the helical pile acceptance criteria
Design helical foundation system with more confidence

Target Audience

This workshop will be suitable for Structural engineers, geotechnical engineers, technicians, and technologists. Civil engineers, public works and construction department employees of federal, provincial and municipal governments and engineers responsible for large industrial, commercial or institutional facilities who must deal with different types of foundations.

The course will be of interest to a wide range of practising civil engineers at different stages in their careers. Some familiarization with soil mechanics is desirable but the knowledge is not required at a specialist level.

Special Features

The two-day course will consist of a series of lectures and workshops. Worked examples with numerical reference will reinforce the lectures. Case studies which illustrate the full range of problems are a feature of the course. There will be workshops on helical pile design under different types of loads; a display of DYNA 6 modelling of pump station on screw piles will be displayed.

Objectives

The main objective of this workshop is to enable participants to select the best helical foundation solution for different types of civil engineering problems. After completing the course participants should be able to design helical foundations and supervise their construction. Understand the acceptance criteria, and related equivalent torque design. The course philosophy is to provide the participants with the information they need to design foundations at the state of the art. The information is supplied in a simple and systematic way, discussing topics where current knowledge is lacking and more understanding is needed.

The PDDP Distance Education program works as follows:

Once you register for this course, you will be sent a login username and password for our online distance website.

You will receive the course notes in hard copy through the online website, you will receive a set of notes each week covering the course material.
A one hour video-conference session will be conducted by your instructor each week (if required). The objective of this session is to assist in solving the assignments, as well as answer student questions that should be sent to instructor early enough prior to the meeting time. In addition with being able to communicate with the instructor, you will also be able to communicate with other students in the same class and watch their questions being answered as well. (A high speed internet connection is strongly recommended for this feature).
Each set of exercises can be completed and submitted by the indicated date and your completed exercise will be marked online and and returned by your instructor.
To gain the most from your course, it is highly recommended that you participate fully in all discussions and exercises. Please remember that each course has a form of quiz or exercise at the end to test your understanding of the material. You will be informed of these dates when you receive the course schedule.

*Course commencement date is subject to instructor availability.

Introduction

Helical Screw Foundation Definition
Development history
Essential Elements
Bearing plate
A central shaft
A termination
Round Rod Anchors
Square Shaft Anchors
High-Strength Anchors
Power Installed Foundation Anchors
Pad-Pod Foundation Anchors
Street Light Foundation Anchors
Tension/Compression Foundation Anchors
HELICAL PIER Foundation Systems
HELICAL PULLDOWN™ Micropiles
Applied Research and Development
Soil Classification Chart by Chance
Soil Classification Data
Torque-to-Capacity Relationships
Soil mechanics principles
Available design software
Inter-helix spacing
Industry Standard: Helical screw foundation form fits function

Applications

Deep foundation replacement
Helical screw foundations for residential and light commercial construction, Machinery/equipment foundations,
Telecommunication and transmission towers,
Tiedowns for wind and/or seismic forces,
Expansive soil areas,
Machinery/equipment foundations
Wind and seismic loading
Limited access sites
Replacement for drilled/driven piles
Foundation underpinning

Advantages of Helical Screw Foundations

Projects requiring deep foundations due to weak surface soil
Flooded and/or poor surface conditions
Limited access
Expansive soils
Bad weather installation
Contaminated soils
Temporary structures
Remedial applications

Related Soil Mechanics

Site Suitability
Soil Volume & Density Relationships
Basic Soil Types
Soil Limit States & Index Properties
Empirical torque multiplier for helical screw foundations
Sensitivity of Clays
Engineering Soil Classification
Soil Characteristics
ASTM (Unified) Soil Classification System
Effective Stress and Pore Water Pressure
Soil Strength
Angle of Internal Friction
Cohesion
Coulomb Equation for Shear Strength
Determination of Soil Parameters
Drilling and sampling
Insitu soil strength measurement
Consistency of Saturated Cohesive Soils
Geotechnical report interpretation

Loads

Types of loads
Design or Working Load
Ultimate load
Factor of Safety
Reversing Loads
Dynamic loads and dynamic analysis
Codes and standards
LRFD for helical pile design
DYNA 6 modelling of pump station on screw piles demo

Bearing Capacity

Calculating Helical Screw Foundation Capacity
Non-Cohesive Soil
Cohesive Soil
Mixed cohesive- non cohesive Soil

Lateral Capacity

Lateral Resistance – Methods Used
Shaft resistance
Battered Piles
Passive Earth Pressure Resistance
Lateral Analysis by Finite Differences
p-y concept
Group Effects
Computer programs,
Lateral Analysis by Brom’s Method
Lateral Capacity by Battered Helical Screw Foundations and Anchors
Lateral Capacity by Passive Earth Pressure
Design Example

Design of helical pier foundations in frozen ground

Buckling/Slenderness Considerations

Buckling Analysis by Davisson Method
Design Example
Determining Critical Buckling Load, Pcr, by Davisson Method
Buckling Analysis by Finite Differences
Design Example: Determining Critical Buckling Load by Finite Difference
Buckling Analysis by Finite Elements
Design Example: Determining Critical Buckling Load by Finite Elements

Helical Piles Corrosion

Corrosion Theory
Corrosion Types
Electrical Factors
Metallic Path
Aeration
Soil Environments
Soil Type
Ground Water
Soil pH
Soil Resistivity
Soil Resistivity/Corrosion Rate Potential
Prediction of Corrosion Loss Rates
Electromechanical Properties of Mildly Corrosive Soils
Corrosion of Zinc in Various Waters
Corrosion in Undisturbed Soil
Corrosion in disturbed Soil
Corrosion of Helical Screw Foundation at the Waterline
Corrosion of Helical Screw Foundation with a Concrete Cap
Corrosion Control
Passive Protection
Allowable metal loss rate
Galvanization
Bituminous and Other Coatings
Design Examples
Active Protection

Helical Piles selection:

Available market brand names

Field Production Control

Helical Screw Foundations - How They Work
Installation Torque/Load Capacity Relationship
Torque Factors
Energy Relationships
Reliability of Torque/Capacity Model
Measuring Installation Torque
Shaft Twist
Shear Pin Torque Limiter
Mechanical Dial Torque Indicator
Differential Pressure Torque Indicator
In-Line Hydraulic Pressure Gauge
Installation Termination Criteria
Tolerances
Torque Strength Rating

Static Load Testing

Load Testing during Design
Slow-Testing Methods ASTM D1143 Standard
Quick Load Test Method for Individual Piles ASTM D1143 – 81
Loading Apparatus for Applying Compressive Load
Reaction anchors
Measuring Deflection
Acceptance Criteria

Helical piles in Building Codes

IBC 2006
IBC 2009
Product Evaluation Reports
AC358 Acceptance Criteria Development
Evaluation Criteria

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