Middlebrook Road Bridge Replacement

Overview Tablelands Regional Council invites tenders from suitably qualified tenderers for the Middlebrook Road Bridge Replacement. Scope Measurement of Existing Structure The Contractor shall confirm the exact dimension of each span at the location of each of the four replacement girders before manufacture of these girders commences. Discrepancies between the measured dimensions and those shown on the drawings should be reported to the Engineer of Record (EOR) for further instruction on how the lengths of the affected girders should be adjusted. Preparation of a Project Plan The Contractor shall prepare a project plan (or plans) addressing the following three construction pillars, prepared to address the legislative requirements and with due consideration to any issues presented by the worksite: Work Health and Safety Management Environmental Management (the Environmental plan must particularly reference the Wet Tropics Management Authority Road Maintenance Code of Practice) Quality Management Demolition Works Prior to dismantling the existing superstructure, stabilise the midstream pile bents with cables to ensure the relative position of the pile bents to the abutments is maintained after removal of the girders Attach cables to the columns in locations that do not interfere with specified strengthening works or attachments Dismantle the existing superstructure and dispose of materials as required by the Superintendent/Client Reconstruction of Substructure The abutment renewal will require the drill rig for the bored piers to cross the creek via the temporary crossing shown on the plans. The temporary crossing may also be used to assist with demolishing the superstructures. Install temporary propping and cross-bracing to hold Pile Bents 1 and 3 in position while removing segments from piles to facilitate construction of the reinforced concrete raft foundations Refresh the temporary crossing of Middlebrook Creek as the bypass during the bridge renewal works Submit the Approved Development Requirements form to DPI upon commencement of works on the waterway Install necessary sediment control fencing before superstructure demolition work commences Construct the bored piers without disturbing the existing grouted rock facing to the current abutment Place concrete in the pier bores via concrete pump to prevent separation of the concrete mix during placement Undertake mandatory concrete testing and formwork and reinforcement inspections Replacement of Superstructure Machine and pre-assemble all Glulam elements of the superstructure in a manufacturing setting before preservative treatment Confirm the fit of all elements, connections and attachments during pre-assembly, then dismantle and individually treat the Glulam elements before transporting them to site for final erection Provide an Erection Plan to the EOR for approval at least 21 days prior to proposed erection of the superstructure, outlining the sequence of erection, the extent of pre-assembly and craning of sections into position, details of lifting devices and attachments and their respective positions, and the procedure for positioning and setting the girder seatings to line and level Restoration of Approaches Confirm the measurements for existing wingwall alterations at Abutment 1 and verify with the EOR that the proposed design for its modification is adequate Excavate both approach areas for placement of subbase and basecourse layers, and place and compact layers to the required density Construct reinforced concrete approach slabs Install the transition guard rail and the approach and departure guard rail systems to the minimum lengths specified Apply the two-coat primer seal and final seal as specified to the limit of works shown on the drawings