DEFDV014B
Perform concreting in an underwater environment

This unit covers the competency required to concrete simple forms and excavations in an underwater environment.The unit also includes preparing the underwater site for concreting including any necessary excavation and levelling, constructing simple formwork and positioning reinforcement rods and fixed anchorages.The diver will need to prepare the concrete with consideration given to strength and setting periods. The concrete will need to be poured and screeded to the required finish.The diver will be responsible for the recovery of formwork and waste arising from the work task to ensure the preservation of the environment. Finally, the concreting tools must be de serviced and stored appropriately for ongoing use.Note: This Unit of Competency relates, in part, to the existing standards of the Australian Diver Accreditation Scheme (ADAS). All information was correct at the time of development of this Unit of Competency; however, any diver seeking ADAS accreditation should consult ADAS and not rely on the information contained in this unit.

Application

As agreed in the creation of this Training Package, applications for units transferred from the PUA00 Public Safety Training Package will be developed as part of continuous improvement plans, and taking into account the change in Unit of Competency format as detailed in templates for Streamlined Training Packages

Prerequisites

DEFDV001B Dive using self contained underwater breathing apparatus in open water to 30 metres.

Elements and Performance Criteria

ELEMENT

PERFORMANCE CRITERIA

1. Prepare for underwater concreting

1.1 Work task and worksite data are determined and analysed to determine the specific requirements for the concrete.

1.2 Work plan is developed consistent with the dive plan.

1.3 Concretingequipment is selected, inspected and prepared including protective equipment.

1.4 Concreting equipment is secured safely to/from the dive site.

1.5 Access obstructions and other hazards are assessed and action is taken to remove/reduce the risk.

2. Concrete underwater site

2.1 Work-safe area is established at the worksite.

2.2 Site is cleared and levelled in preparation for the pour.

2.3 Formwork is assembled including stripping agents.

2.4 Reinforcing bars, rods, stirrups and mesh, bar chairs and spacers are positioned.

2.5 Cement is mixed in accordance with the setting and strength specifications.

2.6 Location and safety of divers is confirmed prior to commencing the pour.

2.7 Cement is delivered to the site with a consistent flow.

2.8 Concrete is spread to the required levels incorporating expansion joints.

2.9 Concrete is screeded to a level and the surface is finished using floats or brooms.

2.10 Concrete is protected during curing.

3. Conclude underwater concreting

3.1 Environmental impact arising from the concreting is minimised and waste products and formwork are recovered.

3.2 Concreting and protective equipment are de-serviced and stored after use.

Required Skills

This describes the essential skills and knowledge and their level, required for this unit.

Required Skills

establish formwork

mix and pour cement

operate cement tools and equipment

screed concrete

Required Knowledge

concreting on land

dive equipment

dive physics

general occupational/diving safety awareness

oceanography

relevant references and Australian Standards

work hazards

Evidence Required

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessment must confirm the ability to attend to personal and collective safety; and to consider the environmental impact as part of the dive plan.

Consistency in performance

Competency should be demonstrated during a work task where the diver conducts an underwater concreting task such as the reinforcement of pier legs, the placement of footings or laying of a slab or ramp.

Context of and specific resources for assessment

Context of assessment

Competency should be assessed in the ocean.

When practicable, assessment should relate to the diver’s vocational focus.

Specific resources for assessment

Access to a dive location, a complete range of concrete ingredients and concreting equipment.

Range Statement

The Range Statement relates to the Unit of Competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording in the Performance Criteria is detailed below.

Work task may include:

pad foundation

post holes

slabs

trench foundations

Worksite data may include:

current

depth

gradient

hazards

obstacles

temperature

Concrete may vary by:

composition/strength

setting time

Concreting equipment may include:

manual, fuel and electrically operated mixers

shovel

vibrator

Selecting, inspecting and preparing concreting equipment may include:

pre-construction of formwork

pre-mixing

Protective equipment may include:

boots

gloves

Action to remove/reduce the risk may include:

erecting signage

using patrol/sentry craft

Formwork may include:

bracing

edge boards

pegs

struts

Delivery of cement may be via:

manual

pump-line

shute

Protection of concrete may include:

use of plastic sheeting

Environmental impact may include:

contamination of surrounding water (e.g. leaking oil)

physical damage to reef and associated floor eco-systems (e.g. coral)

visual pollution of waste material (e.g. concrete and metal parts)

Sectors

Not applicable.

Employability Skills

This unit contains employability skills.

Licensing Information

Not applicable.