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Erection of steel Structure

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Erection Of Steel Structure

Erection of steel girder and steel truss bridges
Different Methods and Equipments

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Erection of steel Structure

  1. 1. Shree Swami Atmanand Saraswati Institute of Technology Erection of Steel Girder and Steel Truss Bridges Prepared By :- Balar Piyush 110763106063 Vekariya Sandeep R. 120763106001 Kakadiya Gaurang A. 120763106002 Balar Jigar H. 120763106003 Guided By :- Prof. A.P. Satasia Prof. P. V. Trivedi Prof. R. R.Tripathi Railway Bridge & Tunnel Engineering
  2. 2. † Contents  Introduction to Steel Girder Bridges  Erection of Steel Girder Bridges  Methods  Erection of Steel Truss Bridges  References
  3. 3. † Introduction to Steel Bridges  The steel girder bridge is a structure in which a floor system and roadway, concrete or timber, is supported by girders, usually rolled section beams which are plain or encased in concrete  These are normally used for railways and rarely for highways  Following data should be collected prior to the erection of these bridges:  Time estimate for the construction of a bridge  Condition of proper equipment and machinery  Condition of bridge site  Facility for transportation and storage of materials at bridge site  Necessary supporting system for superstructure  Availability of steel structures  Width and depth of flow in the river  Height of bridge from river bed
  4. 4. Methods for erection of steel bridges Erection by Lifting Method Erection by Staging Erection by Floating Erection by Rolling Erection by Launching of single girder span † ERECTION OF STEEL GIRDER BRIDGES
  5. 5. † Erection of Steel Bridges  Methods  Erection by Lifting Method  Steel girders upto span of 30 m can be easily erected if the height is 5 to 6 m  This method is suitable for rivers which are dry for the most part of the year  A platform is created by filling earth to sufficient height and levelled  Girders are assembled on the river bed and field riveted/bolted  They are lifted into position by means of stiff-leg derrick cranes or ordinary rope worked from anchored crab winches  The flooring and the bracings are then field connected to the girders placed in position
  6. 6. SOLNA BRIDGE, STOCHOLM, SWEDEN
  7. 7. † Erection of Steel Bridges  Methods  Erection by Staging:  Favourable conditions:  Depth of water in the river is shallow  Height of superstructure above the river should not be excessive  Span should be simply supported  Staging consists of trestle frames which may be of steel or timber  Iron staging is lighter than timber staging and, therefore, can be easily transported  Staging is suitably designed and after it is constructed, the erection of steel girders is commenced on the staging
  8. 8. † Erection of Steel Bridges  Methods  Erection by Floating:  Favourable conditions for this method are:  Depth of water in the river is more Floating barges/pontoons are used to carry the steel girders Bridge is assembled on the barges and is floated into position when complete. The barges are so positioned that span is over the final alignment, when the jacks are used to lower the span on the bearings. Finally the barges are sunk by flooding the tanks
  9. 9. Coleman Bridge, York River in Yorktown
  10. 10. † Erection of Steel Bridges  Methods  Erection by Rolling:  This method is adopted for erection of continuous girders on deep gorges  First span near the abutment is erected by any one method of erection  Girders of the first span are brought to the required position by rolling them from the abutment through the erected span  This method is also known as the Incremental Launching Method and has become very popular for the concrete girders  Second span is cantilevered when it projects from the erected span and acquires counter weight for its stability  This counter weight is provided by the successive span connected to it and its back
  11. 11. † Erection of Steel Bridges  Erection by Launching of single girder span  Each girder is first assembled on a track of rollers behind one of the abutments and is cantilevered as far as possible over the span.  The lifting blocks are then fastened to the outmost point of the girder and the heavy wire is coupled to the winch.  Rear end of the girder is tied to another winch which is released slowly so that sudden forward motion may no take place.
  12. 12. † Erection of Steel Truss Bridges  These bridges are erected with the help of a stiff derrick traveller and two false work bents  Erection procedure may be described in four stages:  Second stage  Move traveller (crane) to B  Erect false work bent T2  Assemble the section BC  First stage  Erect false work bent T1  Assemble the section AB
  13. 13. † Erection of Steel Truss Bridges  Third stage  Move traveller to C  Remove false work bent T1 from B and erect it at D  Assemble the section CD  Fourth stage  Move traveller (crane) to D  Assemble the section DE  Release the false work bent T1 and T2
  14. 14. † References  ftp://ftp.mdt.mt.gov/research/LIBRARY/NSBASBEGS-1-OL- STEEL_BRIDGE-AASHTO.PDF  http://www.deldot.gov/archaeology/historic_pres/hist_bridge_surv ey/pdf/steel.pdf  http://www.kwhconstructors.com/img/gallery/williamr.bennettbridg e/wrb_bridge5.JPG

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