Standard
Track updates
AS 4744.1:2025
[Current]Shoring and trench lining, Part 1: Design
AS 4744.1:2025 specifies requirements for the design, construction, intended use and rating of steel and aluminium shoring and trench lining equipment assembled completely from prefabricated components for use in excavation operations, in order to protect persons, the works and adjoining areas or infrastructure from the effects of any instability of the excavated soil face and/or adjacent in situ soils from movement or collapse
Published: 21/03/2025
Pages: 38
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 New designs and innovations
1.5 Symbols and abbreviated terms
2 System and components — Description and examples
2.1 Common trench lining systems
2.1.1 Trench boxes
2.1.2 Slide rail
2.1.3 Drag box
2.2 Supporting components
2.2.1 Strut
2.2.2 Extension units
2.2.3 Post
2.2.4 Pins
2.3 Strut to panel and slide rail connection
2.3.1 Articulated connection
2.3.2 Clearance only connection
2.3.3 Fully restrained connection
2.4 Panel to panel connections
2.4.1 Separate panel connector with pins
2.4.2 Integral panel connector with pin
3 Designation
3.1 General
3.2 Trench box designation
3.3 Panel designation
3.4 Strut designation
3.5 Slide rail post designation
4 Materials
5 Design requirements
5.1 General requirements
5.2 Minimum rated trench box capacity
5.3 Maximum elastic deflection
5.4 Attachment points
5.4.1 General
5.4.2 Extraction points
5.4.3 Handling points
5.4.4 Slide rail posts
5.4.5 Extraction, lifting and handling point positioning
5.4.6 Extraction, connecting and pulling point design criteria
5.4.7 Drag box pulling point design criteria
5.4.8 Design criteria for lifting and handling points
5.4.9 Location of lifting and handling points
5.5 Struts
5.5.1 General
5.5.2 Minimum strut partial safety factor for action
5.5.3 Strut technical requirements
5.5.3.1 General
5.5.3.2 Screw thread external diameter (Do)
5.5.3.3 Screw thread internal diameter (Di)
5.5.3.4 Minimum wall thickness (t)
5.5.3.5 Thread helix angle (α)
5.5.3.6 Thread depth (s)
5.5.3.7 Radial engagement (sr)
5.5.3.8 Axial engagement (sa)
5.5.3.9 Minimum engagement
5.5.3.10 Angular misalignment (β)
5.5.4 Strut connection
5.5.5 Strut component connection
5.5.6 Drag box leading strut
5.6 Strut to panel or slide rail connection
5.6.1 Vertical strut to panel rotation
5.6.2 Horizontal strut to panel rotation
5.6.3 Drag box connections
5.6.4 Strut to panel/slide rail connections
6 Instruction manual
6.1 General requirements
6.2 Principal and supplementary contents
6.2.1 Principal contents
6.2.2 Supplementary contents
7 Marking
8 Evaluation of conformity
8.1 Declaration
8.2 Provision of specifications
Appendix A
Appendix B
Appendix C
Appendix D
D.1 Typical soil parameters
Appendix E
E.1 Imposed loads imparted on trench shoring during construction
E.2 Construction plant
E.3 Soil heaps
E.4 Adjacent structures
E.5 Lateral pressure on the shoring due to loads other than uniform surcharge
Bibliography
Cited references in this standard
One-time Purchase
Access via web browser on any device
One-time purchase
Single publication
Offline access via PDF^
$141.91 AUD
Inclusive of GSTFormat *
Web Reader
Licenses *
1 user
Total$141.91 AUD
IMPORTANT