Enviro undertook work on MRWA Bridge 0930 – Haydn Bunton Drive in Subiaco, working closely with the Public Transport Authority & Main Roads WA to perform multiple scopes of work. We were presented with the Category 1 award from CCFWA for this project. The scope is described below:

• Full Traffic Management Plan & mobilisation of traffic control devices
• Submission of Rail Safety Management, Environmental Management, Safety Management Plans to relevant authorities – provision of rail safety personnel.
• Design and installation of earthing and bonding systems
• Engineering design & verification, fabrication and erection of temporary rail protection screens
• Removal of existing rail protection screens and existing precast concrete footpaths
• Form up & pour new cast in situ concrete footpaths with reinforcement bars
• Fabrication of new rail protection screens, guard-railing, W Beams, and balustrades with isolation panels as per MRWA specifications
• Profiling of approach slabs and installation of new asphalt surface to approach slabs and bridge deck.

Due to the high-profile project location in the heart of Subiaco, adjacent to Domain Stadium and over the urban rail network, this project required a contractor experienced in operating in high  risk, high compliance rail environments yet adaptable enough to use innovative construction techniques. The initial scope of works included the removal of existing steel rail protection screens and the removal of the bridge parapet beams over the live rail network, just metres from the 25KVA overhead live equipment (OLE). This posed a huge HSE risk to project staff and risked damage to the OLE and widespread disruptions to the public transport network. We designed, fabricated and installed a custom bridge clamp system which was fitted with access walkways and a temporary rail protection hoarding. The system was installed under an Enviro controlled rail shutdown to allow hi-rail EWPs access to the track infrastructure. This system was earthed and bonded and formed a barrier between the worksite and the OLE allowing the existing rail protection screens to be removed during live rail movements. Ancillary drainage (slurry control) was fitted to the system allowing for civil works and concrete cutting to be undertaken simultaneously. MRWA advised us that it was the first time any such system had been used in the state, if not the country. Our internal rail safety personnel constantly monitored the rail reserve and communicated with PTA train control and engineering staff to plan rail shutdowns as required. Approval times for rail shutdowns were more than 6 weeks – meaning the project construction schedule had to match the pre-booked isolations and shutdown exactly, and delays were not an option. Due to the age and condition of the bridge, there was a lack of accurate as-con drawings showing reinforcing locations within the bridge beams and parapets. We undertook a detailed dilapidation report and services scanning of the bridge to locate and identify reinforcing and drainage systems prior to drilling and installing the bridge clamp system. These works had to be undertaken during a rail shutdown and OLE isolation. After identifying several significant cost and time saving measures, including changing the precast concrete footpath elements to poured-in-situ, and the design and development of the temporary rail protection screens and bridge clamping system we allowed Main Roads to expand the scope of work to include the profiling and resurfacing of the bridge deck, expansion of the paving repairs, additional ancillary works and landscaping not originally allowed for in the tender bill of quantities.

Please click here for a link to the CCFWA website: http://www.ccfwa.com.au/wp-content/uploads/2017/08/Enviro.pdf

Enviro undertook work on the Guildford Rail Bridge, working closely with the Public Transport Authority to perform multiple scopes of work as per below:

• Removal & disposal of timber transoms
• Removal of central walkway
• Installation of new fibreglass transoms
• Installation of new steel central walkway
• Structural repairs to refuge locations either side of both bridges

• Works were carried out during full track shut downs by PTA accredited staff, as well as on open line with safeworking also being undertaken by Enviro.

Enviro were awarded this tender to bring the Old Signal Station on Cantonment Hill up to current BCA requirements so Sea Rescue could move into the building:

Works included:

• Demolition and disposal of existing balustrades to 3 levels;
• Fabrication & installation of new steel balustrades with timber handrail & Perspex screens to 3 levels;
• Electrical, plumbing, joinery works to 3 levels;
• Supply & installation of new external doors;
• Concrete cancer repair works;
• Removal of 15 metre high steel communications mast from rooftop, surface preparation, painting & reinstatement;
• Supply & installation of new fire warning system;
• New liquid applied waterproofing membrane to existing roof;
• Removal of existing glazing to 3 levels;
• Supply & installation of new aluminium glazing units to 3 levels;
• Asbestos panel removal;
• Exterior painting & maintenance to fretted brickwork.
• All works undertaken in accordance with strict heritage guidelines.

nviro were awarded this tender to complete Bridge Maintenance Works to Bridge 4908 on Tilden Drive in Gidgegannup:

Works included:

• Excavation to 1500mm under bridge
• Fabrication and installation of structural steel members.
• Laying of new reinforcement, pouring of concrete in a remote location to strict specifications.
• Installation of stormwater infrastructure
• Preventative & Preservation Maintenance to jarrah timbers forming bridge substructure.

Structural steel Full & Half Cap replacement works were carried out during single lane closures with traffic management handled by Altus Traffic Management with all works undertaken in accordance with MRWA standards.

Enviro were awarded this tender to remove an existing timber footbridge and replace it with a new concrete footbridge with steel stringers and tubular handrails.:

Works included:

• Removal of existing timber bridge and steel handrails
• Conduct penetrometer tests to exposed abutments
• Design & Installation of new proprietary screw piles due to poor soil condition
• Forming & pouring of new reinforced concrete footings and pedestals at each abutment
• Placement of new UB stringers
• Forming & pouring of new reinforced concrete deck above water
• Design, fabrication & installation of galvanized handrails to suit

Upon removing the existing bridge we found that the ground beneath the abutments was not suitable to receive the new footings as detailed on the supplied drawings, so we engaged a structural engineer to design custom screw piles before placing the footings.

Enviro were awarded this tender to complete Routine & Specific Bridge Maintenance Works to Bridge 4020 on Glenorchy Road South in The Shire of West Arthur.:

Works included:

• End grain cleaning & sealing
• Wing wall sheeting repairs
• Concreting footings around wing wall piers
• Cutting out of existing timber piles
• Propping of Bridge
• Design & installation of new steel piles to Main Roads Specifications
• Design & installation of temporary load bearing structure incorporating suspended walkway to perform works under the bridge safely
• Structural steel full cap replacements at both abutments
• Structural steel pile repairs
• Preventative & Preservation Maintenance to Main Roads Specifications

All works were carried out during full road closure with traffic management handled by Evolution Traffic Management with all works undertaken in accordance with MRWA specifications

Enviro undertook work on the Fremantle Rail Bridge, working closely with John Holland and the Public Transport Authority to perform multiple scopes of work as per below:

• Scope 1– Provide 6 man safeworking team to control rail safety management at site.
• Scope 2 – Install new steel angle supports beneath walkway & cut down walkway and PFC’s To allow safe passage of high railer vehicles over the bridge.
• Scope 3 – Repair Structural damage to transom support cleats after collision with the freight ship. Grind and expose Welds for inspection by engineer, Co-ordinate Mag particle testing of main bridge beams, Re-paint exposed steel.
• Scope 4 – Assist with Transom replacement works.

Enviro were awarded this tender to complete Bridge Maintenance Works to Bridge 4527 on Bailup Road in Wooroloo.:

Works included:

• End grain cleaning & sealing
• Wing wall sheeting repairs
• Concreting footings around wing wall piers
• Excavation to 1500mm under bridge
• Design & install temporary steel walkway
• Structural steel full cap replacements at both abutments
• Structural steel pile repairs
• Removal of existing asphalt surface & concrete overlay
• Laying of new reinforcement, pouring of new bridge concrete overlay and kerbs
• Placement of 30mm thick asphalt top surface
• Supply & Installation of new guardrails
• Preventative & Preservation Maintenance

Full & Half Cap replacement works were carried out during full road closure with traffic management handled by WARP Traffic Management with all works undertaken in accordance with MRWA specifications

Enviro were the successful tenderer to design, supply & install new beach access stairs to the highly popular Surfer’s Point in Margaret River.

Works were split amongst between 3 separable portions; Stair Packages 5A & 5B, along with Connecting Boardwalk 5C.

Works included:

• Site survey and set out.
• Creation of shop drawings for approval by client and engineer.
• Excavation of cliff face
• Construction of piled foundations & substructures to loose sand dunes
• Installation of screw piles
• Construction and installation of composite joists and decking.
• Fabrication, abrasive blasting and treatment of steel balustrades.
• Installation of aluminium ‘Hall of Fame’ plates relating to the World Surfing Championships
• Fabrication and installation of stainless steel brackets
• Installation of jarrah handrails.
• ASCON Drawings