 
This Project
involved the design & construction of a double span, 35.0
m long single lane bridge. The bridge is located over the
Inglis River, and is subject to flooding.
The existing abutments were utilised in
the design, having been completed 12 months earlier by another
contractor. Our design called for 3 No. 310UC118 piles to be
installed to found the cast in-situ pile cap on. The piles were
driven to a depth of 4.0 m below natural surface level. Stubbs
Constructions Pty. Ltd completed this portion of the project
in-house
A pre-cast blade pier and cross-head
were constructed as a central support. The pier and cross-head
were manufacture at our Burnie pre-cast yard, and transported
to site. High tensile bolts were used to attach the cross-head
to the pier, and grouted pins were used at the pier base.
Pre-cast concrete wing walls were installed,
utilising reinforced earth. A geogrid cast into the wingwall
panels formed the reinforcing for the backfill behind the wingwalls.
The superstructure was constructed from
pre-tensioned concrete planks. Each of the two spans consisted
of 8 No. 17.5 m long planks. These planks were manufactured
by Stubbs Constructions Pty. Ltd. transported to site, and installed
using 2 No. 50 tonne hydraulic cranes in a dual lift.
A cast in-situ deck was installed over
the planks to complete the deck structure. A level 2 guardrail
was installed, along with BCT approached and departures.
The environmentally sensitive area within
which construction took place necessitated the use of several
techniques to minimise impact. These included oil booms to trap
any spill from machinery, sediment fences to minimise ingress
of solids into the river system, run off management, and solid
waste disposal and recycling.
|
