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construction of bridges

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  1. 1. PRESENTATION ON Bridge construction Techniques Shivraj Karape (16211205)
  2. 2. • A bridge is a structure providing passage over an obstacle without closing the way beneath. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. The obstacle to be crossed may be a river, a road, railway or a valley.
  3. 3.  Superstructure or Decking  Bearings  Substructure  Piers and Abutments  Foundation
  4. 4. According to the flexibility of superstructure 1. Fixed span bridges 2. Movable span bridges
  5. 5. Fig.-: Movable span bridges b)a) Fig.-: Fixed span bridges
  6. 6.  According to the form or type of superstructure 1. Slab 2. Girder 3. Truss 4. Arch 5. Suspension 6. Cable stayed  According to the materials of construction 1. Cement concrete 2. Pre-stressed concrete 3. Steel 4. Masonry
  7. 7. 1. Movable – bascule bridges 2. Movable – swing bridges
  8. 8. 1. Temporary Bridges 2. Military Bridges 3. Permanent Bridges According to the function 1. Road 2. Railway 3. Pipeline
  9. 9.  A foundation is the part constructed under the pier/abutment and over the underlying soil or rock.  The loads transmitted by the foundation to the underling soil must not cause soil shear failure or damaging settlement of the superstructure. • Purpose of foundation is to distribute the load of bridge over a large bearing area and provide stability of bridge against settlement and tilting.
  10. 10.  Shallow Foundation Spread Foundation and Raft foundation  Deep Foundation Pile, caisson and well Foundation
  11. 11. Box Caisson • Box caisson is as like a box that is opened on topside and other sides are closed.
  12. 12.  Open caisson is as like well that is opened on top and bottom ends.  Bottom edges are made sharp.  During digging and sinking the inside material is taken out.  Open caissons are used in soft soil and in high water level.