Managing Excavation Safety Introduction Heath McHugh CMIOSH Health - - PowerPoint PPT Presentation

▶
managing excavation safety introduction
SMART_READER_LITE
LIVE PREVIEW

Managing Excavation Safety Introduction Heath McHugh CMIOSH Health - - PowerPoint PPT Presentation

Nov 21, 2022 239 likes •743 views

Managing Excavation Safety Introduction Heath McHugh CMIOSH Health & Safety Manager (MGF) David McNair BEng (Hons) EngTech MICE Senior Design Engineer (MGF) Scott Ellis Group H&S Manager Eric Wright Agenda What is Temporary Works?

slide-1
SLIDE 1

Managing Excavation Safety

slide-2
SLIDE 2

Heath McHugh CMIOSH Health & Safety Manager (MGF) David McNair BEng (Hons) EngTech MICE Senior Design Engineer (MGF) Scott Ellis Group H&S Manager Eric Wright

Introduction

slide-3
SLIDE 3

Agenda

  • What is Temporary Works?
  • Why are Temporary Works Required?
  • Temporary Works Management
  • Temporary Works Process
  • Impact of a Poor Brief
  • Benefits of a Good Brief
slide-4
SLIDE 4

What is Temporary Works?

slide-5
SLIDE 5

Who are MGF?

slide-6
SLIDE 6

Why Excavate?

slide-7
SLIDE 7

Why are TW’s required?

slide-8
SLIDE 8

Why are TW’s required?

slide-9
SLIDE 9

TW’s Process

slide-10
SLIDE 10

Stage 1: Planning & Investigation

slide-11
SLIDE 11

Stage 1: Planning & Investigation

slide-12
SLIDE 12

Stage 1: Planning & Investigation

2

  • 1. Geometry - Embankment
  • 2. Structure - Building
  • 3. Structure – Retaining Wall
  • 4. Environment – Tree
  • 5. Structure – Boundary Wall
  • 6. Infrastructure - Highway
  • 7. Body of Water – Pond?

1 3 4 5 6 7

How many hazards can be identified?

slide-13
SLIDE 13

Stage 1: Planning & Investigation

Identifying Hazards – Annotated Photos

slide-14
SLIDE 14

Stage 1: Planning & Investigation

slide-15
SLIDE 15

Stage 2: Design

slide-16
SLIDE 16

Stage 2: Design

slide-17
SLIDE 17

Stage 2: Design

slide-18
SLIDE 18

Stage 2: Design

slide-19
SLIDE 19

Stage 2: Design

slide-20
SLIDE 20

Stage 3: Construction

slide-21
SLIDE 21

Overview of MGF Design Process

slide-22
SLIDE 22

Impact of Poor Information

Longer Design Process Cautious Design Approach Revisions Operational Change / Frustrations Increased Cost Strained Relationships (Internally & Externally)

slide-23
SLIDE 23

Impact of Getting it Wrong

slide-24
SLIDE 24

Benefits of Good Information

Value Engineered Solution Time (Delivery) Time (Programme) Economical Solutions No Revisions Required Satisfied Customer / Client

slide-25
SLIDE 25

What Good Looks Like

slide-26
SLIDE 26

Edge Protection

slide-27
SLIDE 27

Emergency Rescue

slide-28
SLIDE 28

Programme

Planning - process

  • Temporary works

management

  • Site investigation
  • Confined space
  • Risk assessment
  • Competence
  • Work area
  • Work method

Construction Phase

  • Safe digging practice
  • Trench support installation
  • Inspection
  • Safe working
  • Emergency arrangements
  • Back fill / reinstatement

Review

slide-29
SLIDE 29

Planning

slide-30
SLIDE 30

Risk assessment

slide-31
SLIDE 31

Planning & prep

  • Competent staff & workers
  • Current drawings (3 month)
  • CAT & Genny
  • Mark up
  • Hand dug trial holes (backfill

with sand)

  • Permit to dig

Safe digging practice

  • Insulated tools & AR overalls
  • 500mm rule
  • Don’t dig down on mark up

Avoiding underground services

slide-32
SLIDE 32

Confined space?

slide-33
SLIDE 33

Confined space?

slide-34
SLIDE 34

Risk Assessment Avoid Manage the risk Competent people Emergency arrangements

Confined space?

slide-35
SLIDE 35

Logistics & Segregation of works

slide-36
SLIDE 36

Deliveries & storage

slide-37
SLIDE 37

Equipment on site & ready for use Competent installers Following a plan

Trench support installation

slide-38
SLIDE 38

Sheets & frame

Types of shoring

Boxes

slide-39
SLIDE 39

Trench support

slide-40
SLIDE 40

Battering / stepping back

slide-41
SLIDE 41

Permit to proceed Completed by the TWC Part 3 Permit to strike

Permit to proceed

slide-42
SLIDE 42

Before each shift After any event likely to affect its stability After any earth fall or fall of material

Inspection

slide-43
SLIDE 43

Part 3 Permit to strike

Permit to proceed

slide-44
SLIDE 44

We must have and practice an emergency evacuation We cannot rely on the emergency services!

Emergency arrangements

slide-45
SLIDE 45

Part 3 Permit to strike

Permit to proceed

slide-46
SLIDE 46

Surcharge Stop blocks Damage to services Density / settlement

Backfill & reinstatement

slide-47
SLIDE 47

We don’t do enough of this What went well & what never!

Review

slide-48
SLIDE 48

Summary – we’ve looked at

Planning - process

  • Temporary works management
  • Site investigation
  • Contamination
  • Ground water
  • Ground strata

Design process

  • Confined space
  • Risk assessment
  • Competence
  • Work area
  • Work method

Construction Phase

  • Safe digging practice
  • Trench support installation
  • Inspection
  • Safe working
  • Back fill / reinstatement

Review

slide-49
SLIDE 49

Thank you

Heath McHugh David McNair Any questions? I would like to thank our sponsors today MGF (link) M&P Surveys (link)