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1、Structural CasebookSTEELStructural Steel Development Group Issue number 15 January 1997Queensland Rail Mainline UpgradeThis case study was written at the time when OneSteel was part of BHP. In that context, in some instances within this case study, reference may be made to BHP. CAIRNSNorth Johnstone
2、 RiverTully RiverHerbert RiverCrystal CreekSaltwater CreekSleeper Log CreekHealy Creek TOWNSVILLE14 Bridges including Plantation CreekAndromache RiverOConnell RiverSt Helens CreekMACKAYBasin CreekWest Hill CreekFlaggy Rock CreekCattle CreekSt Lawrence CreekAlligator Creek ROCKHAMPTONBoyne RiverMurra
3、ys CreekLittabella CreekKolan RiverBurnett RiverMary RiverPetrie CreekAcrobat CreekSouth Mooloolah AnabranchBRISBANENGLADSTONEBUNDABERGver the last four years Queensland Rail hasundertaken a massive $590m capitalinvestment program in rail infrastructure inQueensland, referred to as the Main Line Upg
4、rade (MLU) project. Due for completion in 1997, the program includes the acquisition of new generation rollingstock, and the upgrading of the North Coast Line from Brisbane to Cairns and selected South West Branch Lines. The upgrading of the North Coast Line represents approximately 64% of the total
5、 capital investment. The planning, organising and design work involved in the upgrade of the 1,680km long rail line was undertaken under the direction of Queensland Rails Engineering Services and Project Services Divisions, of the Business Services group. The Planning and Research Division of the Fr
6、eight Group was also heavily involved. The scope of work for the North Coast Line component of the MLU project includes: realignment of curves and grades (deviations) to improve transit times elimination of the majority of timber bridges and strengthening of the remainder to 20 tonne total capacity
7、upgrading of steel bridge spans from 15.75 tonne axle load capacity to 20 tonne axle load capacity partial re-sleepering of the line north of Rockhampton with steel sleepers (total of 420,000 sleepers)The MLU project will improve travelling times from Brisbane to Cairns and will increase the competi
8、tiveness of rail passenger and rail freight transport in Queensland. The lines capacity will be increased by 25% and freight travel time reduced from 40 hours to 27 hours.The magnitude of the project necessitated the involvement of five principal civil engineering consult- ants to carry out detailed
9、 design, documentation and supervision services for the deviations, timber bridge replacements and steel bridge strengthenings.Steel bridge strengthening and timber span replacement: Part of this work involved the upgrading of approxi- mately 56 steel bridges (at a cost of $26m) from 15.75 tonnes to
10、 20 tonnes axle load capacity, as well as the replacement of a large number of timber approach spans with steel girder spans.The various steel bridge strengthening techniques adopted depended on the type of bridge and the particular structural members which were under- capacity. The versatility of s
11、tructural steel is demon- strated by the ease with which the structures were modified. The ability to strengthen individual steel bridge members or to add new steel members, whilst operating within narrow windows of track possession time, provided Queensland Rail with a cost effective means of achie
12、ving the necessary 4.25 tonne increase in axle load.The condition of the existing steel girders was generally found to be very good and is testimony to the durability of structural steel and the quality of Queensland Rails maintenance program. Existing steelOgirders were reused extensively, which al
13、so contributed to the cost effectiveness of the steel bridge upgrade. BHPs Welded Beams featured strongly both as girders and as bracing diaphragm members.The strengthening options adopted for the various steel bridges included: insertion of intermediate piers (either concrete or steel) to reduce sp
14、an lengths replacement of longitudinal girders with larger girder sections, or inclusion of additional girders replacement of cross-girders with stronger unitsTo simplify the task, the line was broken into five main segments - Brisbane to Bundaberg, Bundaberg to Gladstone, Rockhampton to Mackay, Mac
15、kay to Townsville and Townsville to Cairns. In addition, four Brisbane suburban bridges were upgraded at South Brisbane. A further two bridges, at Cribb Street and Boomerang Street, were undertaken by Queensland Rail.BRISBANE SUBURBAN STEEL GIRDER BRIDGESKinhill Cameron McNamara Pty Ltd carried out
16、the engineering design for the upgrading of the Russell, Glenelg, Ernest and Tribune Street rail bridges, all of which are over road. The contractor and steel erector for the four bridges was J.F. Hull Holdings Pty Ltd, whilst steel fabrication was undertaken by Belconnen Steel Pty Ltd.Russell Street bridge: The Russell Street bridge, which was originally constructed in the 1890s, has an overall length of 16.5m and a width of 14m, excluding the pedestrian walkway. T
