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Strahan Wharf Seawall Rehabilitation

ClientTasPorts
Value$1.1M
StateTasmania
CompletedMay 2015

The Strahan Wharf Seawall Rehabilitation project involved the demolition and reconstruction of a 50 m long earth fill wharf used by the local community and commercial fishermen. VEC are experienced in piling in marine and estuarine environments with the majority of bridge projects being completed over Tasmania’s coastal estuaries.

The Project

VEC pay close attention to the durability requirements of piling work and access requirements, including piling in areas with poor ground conditions.

The replacement structure comprised of a line of AZ-38 sheet piles supporting a 300 mm thick concrete slab with a new diesel bowser and significant provision for future underground services. TasPorts requirement to maintain working access to the wharf and wharf-mounted diesel bowser necessitated construction of the new structure in 2 separable portions. Construction works occurred in a 9 stage process:

  1. Site establishment, survey and geotechnical investigation: VEC employed local site knowledge.
  2. Piling: existing timber piles were removed and structural steel piles were driven in front of the existing wharf piles.
  3. A protective concrete shield was poured behind the seawall to meet corrosion criteria.
  4. Drainage and service pits were installed in accordance with client specifications.
  5. Electrical and fuel services were relocated in close coordination with TasPorts.
  6. The new slab was prepared insitu and placed.
  7. Insitu kerb formed over water and poured to tie in sheet pile wall.
  8. Fender piles were driven using a rubber tracked excavator and fixed into position with stainless steel straps.
  9. After Stage 1 was completed, Norton’s Jetty access was momentarily cut and replaced with a temporary access gangway for the duration of Stage 2 works. On completion of Stage 2 works, access to Norton’s Jetty was permanently reinstated as part of the new structure.

Community stakeholder liaison was a daily challenge on the project with fishermen, BP tankers, tourism operators and curious tourists all requiring clear communications. Effective communication resulted in no recorded public complaints.

Head Office

10b Industrial Dr, Ulverstone,
TAS 7315

PO Box 812
Ulverstone, TAS 7315
info@vec.com.au

Phone +61 3 6425 6530
Fax +61 3 6425 6112

Hobart Office

Level 3, 116 Bathurst Street
Hobart, TAS 7000

PO Box 812
Ulverstone, TAS 7315
info@vec.com.au

Phone +61 3 6425 6530
Fax +61 3 6425 6112

Melbourne Office

Level 10, 567 Collins Street, 
Melbourne, VIC 3000

PO Box 812 
Ulverstone, TAS 7315
info@vec.com.au

Phone +61 (03) 9278 5100
Fax +61 3 6425 6112

Queensland Office

2 Burke Street,
Woolloongabba, QLD 4102

PO Box 812 
Ulverstone, TAS 7315
info@vec.com.au

Phone +61 3 6425 6530
Fax +61 3 6425 6112