HW2 - Marulan Interchange - South Marulan, NSW HW2 - Marulan Interchange - South Marulan, NSW HW2 - Marulan Interchange - South Marulan, NSW HW2 - Marulan Interchange - South Marulan, NSW HW2 - Marulan Interchange - South Marulan, NSW

HW2 - Marulan Interchange - South Marulan, NSW

Project featuring the RECO TerraPlus™ System

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General Information

As part of the conditions for consent for the development of the Lynwood Quarry, west of Marulan, Holcim (Australia) Pty Ltd constructed an interchange at the Hume Highway south of Marulan.

Lynwood quarry is located in the Southern tablelands region of NSW, 160km south-west of Sydney and approximately 29kms north-east of Goulburn. Located on the site of the old Marulan township, the area is known to have culturally significant Aboriginal & European areas within its footprint, with a number of sites and artefacts found prior to, and during the Environmental Impact Statement investigation phase.

Another key consideration in the system to be adopted was constructability due to staged construction and overall production (m2/day) maintaining both facing erection and backfilling operations concurrently.

After major consideration of all alternatives the preferred system was that of the Adbri Landmark & Miragrid XT Reinforced Soil System (RMS QA Specification R57 Approved System) which ticked all the boxes from design through to construction and OHS considerations.


Construction

Construction of the bridge over the Hume Highway whilst maintaining access/egress from Marulan required detailed planning and complex sequencing of the works. BMD and Retaining Solutions developed SWMS and Construction Method Statement (CMS) satisfying HOLCIM/RMS and all involved parties. HOLCIM was responsible for the provision of all approvals to the works.

The Reinforced Earth Company was the successful tenderer for the design and supply of the RECo TerraPlus™ system for both the piled bridge abutments over the Hume Highway and the road widening walls forming the southbound exist and entry ramps in addition to the Marulan South Rd / Jerrara Road access.

HW2 - Marulan Interchange - South Marulan, NSW

After major consideration of all alternatives the preferred system was that of the Adbri Landmark & Miragrid XT Reinforced Soil System (RMS QA Specification R57 Approved System) which ticked all the boxes from design through to construction and OHS considerations.

Key aspects of this reinforced earth application was the ability of the system to cater for the heavy live loads in addition to longitudinal/transverse loads imposed from the bridge. Forces due to the combined effects of shrinkage, creep and thermal movement of the bridge deck also had to be absorbed by the reinforced soil zone.

The associated bearing pressure loadings at the underside of the crash barrier loading varied from 25kPa to 180kPa under dead load & live load impact. Such loads dictated the use of an “in-extensible soil reinforcement/positive connection system”. Seismic loads were also to be catered by the RSW system.


Scope of Works

Retaining Solutions scope of works involved the installation of RECo TerraPlus™ panels, REHas reinforcing strips, non-woven geotextile to all vertical/horizontal joints, excavation/geotextile encapsulated gravel chimney drains at rear of RSW zone and spreading & compaction of imported RSW select backfill (crusher dust). Due to imposed dead & live loads from bridge, REHas soil reinforcement was also attached to rear of headstock. Retaining Solutions also provided various items of plant on wet hire throughout our time on the project for placement and compaction of H/2 and general fill zones.

Retaining Solutions produces with every wall complete, full quality documentation e.g Inspection & Test Plans, Daily Quality Verification Checklists in addition to detailed daily site diaries detailing operations and overall checks carried out over the duration of the wall construction from levelling pad placement to installation of finishing panels and associated draping of REHas to ensure adequate coverage below services/ crash barrier footings etc. This level of documentation proving to be both beneficial to both developer/owner and Retaining Solutions.


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Project Specs

  • Application - Piled Bridge Abutments & Approach Exit/Entry Ramps
  • Product - RECO TerraPlus™ System
  • Finish - Plain Grey
  • Area - 3007m2
  • Max. Height - 8.0m
  • Length - 750m
  • Loadings - 25kPa
    Crash Barriers
    Bridge Loads
  • Design life - 100 years
  • Owner - HOLCIM (Australia) Pty Ltd
  • Client - BMD Constructions Pty Ltd
  • Construction - 6 months (staged)

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