• PICR#9 Flood Remediation

  • As part of the ongoing flood damage repair program being undertaken by the Department of Transport and Main Roads, AllenCon was contracted alongside ProBuild to deliver PICR Package 9 throughout the Sunshine Coast Hinterland stretching to Esk, in the Brisbane Valley.

    PICR Package 9 consisted of six projects in total and AllenCon delivered four of these packages:

  • SP1: Maleny Kenilworth Road

    Site 1 – Road Slip Remediation

    • Rock fill of the eroded embankment using 20T excavator and body trucks for ease of access/manoeuvring undertaken behind traffic barriers
    • Construction of the widened carriageway using typical pavement widening equipment, 20T excavator (box-out/embankment) 12T single drum roller, single axle water-truck, posi-track
    • Coordination of works around three-way intersection necessitating complex traffic management implementation to cater for the local rural community including large truck deliveries for dairy farmers
    • Liaison with local landowners upon the discovery of a native artefact during excavation to ensure its successful excavation

    Site 8A – New Batter Excavation and Road Realignment

    •  Stage 1 of the works required the removal of large trees from the existing cut slope and the widening and excavation of the cut slope by up to 11m (average 5m). Upon completion of the widening, undertaken by 30T excavator and material haulage by body trucks, a new pavement was constructed
    • Stage 2 works required the switch of traffic onto the newly constructed carriageway and the construction of the remainder of the new road. The one-lane/one-direction traffic scheme, which was regulated by temp traffic lights, remained during this stage of the works
    • As part of the construction works, over 9,500m3 of rock was excavated. This material was re-used to assist local landowners repair recent flood damage to their properties
    • Over 100 gum trees, some over 40m in height, were safely removed from steep slopes adjacent to the existing roadway and this timber was recycled by distributing to local landowners for fencing and other farm use
    • All works performed directly above Mary River with no environmental incidents

     Site 8B New Batter Excavation, Fill to Gully & Road Realignment

    Existing conditions on the road included localised shoulder closures and a one-lane/one-direction lane closure was necessary to undertake the works on Site 8B.  This closure was regulated by temporary traffic lights.

    • Stage 1 of the works required the removal of large trees from the existing cut slope and the widening/excavation of the slope by approx. 4m. As per Site 8A, the excavation works were carried out by 30T excavator and haulage of materials by body trucks
    • Half of the excavated material was re-used to fill a gully that required the installation of 17m of 750dia RCP drainage
    • Following the road widening and completion of the gully embankment works, a new pavement was constructed
    • Stage 2 works required the switch of traffic onto the newly constructed carriageway and construction of the remainder of the new carriageway.  To ensure flow of traffic, a one-lane/one-direction traffic scheme was implemented for this stage of the works
    • As part of Stage 2 work on this project, over 2,000m3 of rock excavated and over 1,200m3 of road embankment was constructed. All works performed directly above Mary River with no environmental incidents 

  • SP2: Maleny - Stanley River Road

    Stage 1 of the road slip remediation works required the controlled filling of a significant embankment slip. The excavation was carried out by 20T excavator, with material haulage by body trucks. The fill works required the installation of temporary sheet piles, with over 250m2 of sheet piling completed on the site, and was undertaken in a two-stage process including the provision of a grout filled layer

    Over 3,700m3 of special rockfill was placed throughout the project and the construction of a new pavement/carriageway on top of this completed Stage 1.

    Stage 2 works saw the switch of traffic onto the newly constructed carriageway and the construction of the remainder of the new road. The works were delivered using typical pavement widening equipment, 20T excavator (box-out/embankment) 6T single drum roller, single axle water-truck and posi-track.

    The remainder of the temporary side-track was removed during this stage with the one-lane/one-direction traffic scheme remaining in operation and regulated by temporary traffic lights.

  • SP3: Nambour - Mapleton Road

    Slip Remediation/Slope Stabilisation & AC Rebuild

    • Stage 1 works required a daytime lane closure and the provision to re-open both lanes to traffic at the conclusion of the day-shift. The eastbound carriageway was milled/profiled and rebuilt in asphalt using corrector coarse and 50mm wearing course
    • The installation of Enkamat & Geoweb slope treatments was undertaken by specialist subcontractors with the table drains and reno mattresses shaped and installed using rubber tracked mini excavators

    Site ch6.44 – Bored Piles/Capping Beam/Backfill & Pavement

    • Work was undertaken under a single-lane closure with suitable traffic barriers utilised to provide a safe work zone behind passing traffic. A W-Beam guardrail was installed prior to removing traffic barriers
    • Installation of 42 linear metres of bored piles was undertaken by specialist subcontractors using a small track-mounted piling rig. A suitable access and piling platform was prepared to allow for adequate manoeuvring of the drill rig

    Site ch8.52 – Slip Remediation & Gabions/Backfill

    • Stage 1 works involved the installation of gabions and rockfill utilising a rubber-tracked minidigger. Gabion installation was carried out by specialist subcontractor
  • SP5: Landsborough - Maleny Road

    Site ch4.05 – Slope Stabilisation/Rock Anchors & Pavement

    This project was carried out under lane closure (southbound carriageway) that resulted in one-lane/one-direction traffic. The traffic flow was regulated by the installation of temporary traffic lights, operating 24/7.

    The works included the installation of over 400 soil nails to an excavated face at 60 degrees. Excavation of the site required the use of long reach excavators and a small Marini rig from the lower benches where larger rigs could not access.

    The location of the site, atop a very steep ridge, required a strong safety focus to ensure the wellbeing of personnel on site. The use of specialised rope access was arranged to enable the operation of multiple drilling rigs and shotcreting crews.

    In order to reach the client’s programme, two crews were run consecutively, to complete the works and have the road open to two lanes of traffic by 20th December.

    Works were completed under PICR Conditions of Contract as part of the Natural Disaster Relief and Recovery Arrangements (NDRRA).