Product Overview

Summary: This Tie-in and Stabilisation Procedures SOP provides a clear, step-by-step framework for safely connecting new works to existing structures or services and ensuring they are properly stabilised. It helps Australian businesses control structural, excavation and service-connection risks, while demonstrating due diligence under WHS legislation and engineering best practice.

Tie-in and stabilisation activities are some of the highest‑risk phases in construction, utilities and infrastructure work. Whether you are connecting new pipework to a live main, tying new structural steel into an existing building, or stabilising temporary works and excavations, the interface between old and new is where uncontrolled movement, collapse, and service strikes most often occur. This Safe Operating Procedure sets out a practical, field-ready method for planning, authorising and executing tie-ins and stabilisation works in a controlled, compliant and repeatable way.

Developed for Australian conditions and WHS expectations, the SOP walks your team through pre-start engineering checks, isolation and verification of services, temporary works design and installation, load transfer sequencing, and final inspection and sign-off. It clarifies roles between engineers, supervisors and workers, and embeds risk management into each stage of the job. By implementing this procedure, organisations can significantly reduce structural and excavation incidents, avoid unplanned outages to critical services, and provide clear evidence of due diligence to clients, regulators and principal contractors.

This document is particularly valuable for multi-contractor sites and projects where existing assets must remain live or partially operational during works. It supports consistent training, improves communication during critical lifts and transfers, and standardises the documentation required before any tie-in or stabilisation work proceeds, helping you keep people safe while delivering projects on time.

Key Benefits

• Reduce the risk of structural instability, collapse and uncontrolled movement during tie-in activities.
• Ensure safe and compliant connection to existing services, utilities and structures in line with Australian WHS requirements.
• Standardise planning, permits and sign-off for all tie-in and stabilisation works across projects and contractors.
• Improve coordination between engineers, supervisors and field crews during high-risk changeover and load-transfer stages.
• Demonstrate due diligence to clients, regulators and principal contractors through clear, auditable procedures and records.

Who is this for?

• Site Supervisors
• Construction Project Managers
• Civil Engineers
• Structural Engineers
• WHS Managers and Advisors
• Utilities and Services Coordinators
• Forepersons and Leading Hands
• Pipeline and Services Installation Crews
• Scaffolding Supervisors
• Maintenance and Shutdown Coordinators

Hazards Addressed

• Structural collapse or partial failure during tie-in or stabilisation
• Uncontrolled movement or shifting of structural elements or temporary works
• Failure of temporary supports, props, shoring or bracing
• Striking or rupturing live underground or above-ground services (water, gas, power, communications)
• Unplanned release of stored energy when cutting, lifting or disconnecting existing structures or pipework
• Falls from height associated with working on partially stabilised structures
• Excavation wall collapse or ground instability during tie-in works
• Crush injuries and pinch points during alignment, lifting and positioning of components
• Exposure to hazardous atmospheres in confined spaces during service tie-ins
• Plant–person interaction risks during crane operations, lifting and placement of structural members

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Terminology (Tie-in, Stabilisation, Temporary Works, Live Services)
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Planning, Engineering Assessment and Design Inputs
• 5.0 Risk Assessment, Permits and Authorisation Requirements
• 6.0 Pre-Start Checks and Site Preparation
• 7.0 Isolation, Verification and Protection of Existing Services
• 8.0 Temporary Works, Shoring, Bracing and Stabilisation Requirements
• 9.0 Tie-in Procedures for Structural Elements
• 10.0 Tie-in Procedures for Pipelines, Mechanical and Utility Services
• 11.0 Lifting, Handling and Alignment of Components
• 12.0 Inspection, Testing, Load Transfer and Final Stabilisation
• 13.0 Working at Heights and Access Requirements
• 14.0 Excavation and Ground Stability Controls
• 15.0 Confined Space Considerations (Where Applicable)
• 16.0 Emergency Response, Incident Management and Structural Failure Contingencies
• 17.0 Documentation, Records, ITPs and Handover Requirements
• 18.0 Training, Communication and Toolbox Talk Guidance
• 19.0 Review, Audit and Continuous Improvement

Legislation & References

• Work Health and Safety Act 2011 (Cth and corresponding state and territory legislation)
• Work Health and Safety Regulations 2011 (Cth and corresponding state and territory regulations)
• Safe Work Australia – Code of Practice: Construction Work
• Safe Work Australia – Code of Practice: Excavation Work
• Safe Work Australia – Code of Practice: Managing the Risk of Falls at Workplaces
• Safe Work Australia – Code of Practice: Confined Spaces
• AS/NZS 1170 series: Structural design actions
• AS 4100: Steel structures
• AS 3600: Concrete structures
• AS 3850: Prefabricated concrete elements
• AS 2550 series: Cranes, hoists and winches – Safe use
• AS 4970: Protection of trees on development sites (where relevant to stabilisation near protected vegetation)
• AS/NZS ISO 45001: Occupational health and safety management systems