Concrete Underpinning

1. Before any locations task:

   • Submit a Dial Before You Dig (DBYD) enquiry using

     • PC or mobile device to access www.1100.com.au

     • Phone the call centre toll-FREE on 1100 during business hours

2. Confirm receipt of the enquiry confirmation sheet

3. DO NOT proceed until you receive information from ALL asset owners affected by the project

4. Review the plans and conditions sent by asset owners as they are received

5. Ensure contact details for all authorities responsible for the utilities at the site are listed and kept on-site during operations

6. Record information gained from other parties with areas of interest not registered with DBYD

7. Establish a digital or hard copy file of all identified assets or areas of interest (that can be used on-site by required contractors).

Ascertain if the excavation is a confined space; if so, ensure there is a separate, dedicated SWMS for working in a confined space and that workers/employees have relevant training.

Ensure an emergency plan is in place for working in excavations greater than 1.5m in depth

Emergency plan to take into account unexpected incidents, such as ground slip, flooding, gas leaks and the rescue of workers from an excavation.

The evacuation procedures must be displayed in the following location/s:

• (enter locations here)

Note: Test the emergency plan and evacuation procedures regularly

Note: Don’t assume local emergency services have the capacity or equipment to provide site emergency medical or rescue services. Poor vehicle access (e.g. rough or muddy terrain) can delay or stop standard emergency vehicles. It may be necessary to develop alternative arrangements in the Emergency Response Plan (ERP). (e.g. a first aider trained in more advanced resuscitation techniques or a standby 4x4 vehicle to get paramedics to the site).

Consider:

• Method of underpinning

• Overall depth of the proposed excavation

• Potential impacts on an adjoining property, particularly concerning drainage or collapse

• Instability to adjoining or nearby structures

Any excavation below the foundation level, including retaining walls that could affect the stability of the structure must:

• be assessed by a competent person

• be secured by a suitable ground support system designed by a competent person.

Engineering design prepared

Proprietary documents (detailed drawings / specifications, details for use / storage / precautions, criteria for rejection)

Element documents:

• Proposed sequence of work and SWMS

• Stabilisation methods (temporary and permanent)

• Signed copies of any –

  • Changes made to specifications or signed instructions, advice or diagrams made or issued by an engineer

  • Notification to the relevant authority for works

  • Exemptions from the requirements of regulation granted by any authority

  • Inspection reports if required

  • Any report, licence or authority required to carry out construction work

Planning for the work should include the primary contractor, geotechnical consultant (or appropriate engineer as appropriate).

Assess intended site limitations. Check:

• Layout is suitable

• Overhead obstructions (including power lines)

• Sufficient delivery access

• Sufficient working room.

Note: The soil will be examined by a competent person to ensure that the method of control (e.g. shoring/battering) is appropriate.