Bridges

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The purpose of a bridge is to span physical obstacles such as water, a valley, a railway line or a road.

• Designs of bridges vary depending on their respective requirements.
• The majority of bridges are constructed in concrete or steel, or a composite of both.
• Bridges can be made to be aesthetically very pleasing

Bridge Design Components

Waterway or Clearance

• A bridge over a water course allows for storms of a return frequency applicable to its function.
• A bridge over a railway line, a road, or other facility must have clearances applicable to its space requirements.

Design Codes of Practice

• Internationally recognised and accepted codes of practice are used to guide the design of bridges.

Design Procedures:

• The design procedures cover such matters as:
  • loads – using applicable static, dynamic and other loading conditions,
  • clearances
  • geometry
  • applicable loading parameters
  • types of foundations, sub-structure and superstructure, and their durability
  • expansion joints and bearings, barriers, drainage, accessories, etc.

• The structural design of a bridge include:
  • bases or other founding types,
  • columns, piers, abutments and walls,
  • beams and slabs, and
  • Connections between members

Bridge Inspection and Maintenance:

• Regular inspection is conducted in order to establish the status of the various elements of a bridge:
  • Its size and geometry and type
  • Its structural condition, and the condition of the bearings and expansion joints
  • The condition of its balustrades, sidewalks, and protection measures.

•  Maintenance measures are subsequently designed and scheduled on those bridge elements that have been identified as requiring it.

Selected Projects:

• Kingsway Pedestrian Bridge
• Lotus Gardens Pedestrian Bridge, Tshwane
• Clewer Pedestrian Bridge Over N4, Witbank
• JHB Motorway Expansion Joints Rehabilitation
• Ben Naude Pedestrian Bridge, Soweto
• Bridge 1793 Rehabilitation over Woest Alleen Spruit at km27.6 on N11-9
• Eadie Street Underpass upgrading through N4, Witbank
• Kaalspruit Pedestrian Bridges, Midrand
• Bridge 1550 Rehabilitation over Skulspruit 2 at km31.0 on N11-5
• Bloemhof Bridge Rehabilitation over Vaal River
• Bridge 1796 Rehabilitation over Coetzer River at km29.7 on N11-9
• Bridge 1800 Rehabilitation over Rietspruit 1 at km9.15 on N11-6
• Bridge 1549 Rehabilitation over Skulpspruit 1 at km33.25 on N11-5
• Bridge 1795 Rehabilitation over Arendsfontein River at km35.8 on N11-9
• Ivory Park Bridge Upgrading, Midrand
• Bridge 4805 Rehabilitation over Skulpspruit Tributary at km24.7 on N11-5
• Scandinavia Bridge Rehabilitation over Vaal River
• Parys Bridge Rehabilitation over Vaal River
• Milner Bridge Rehabilitation over Vaal River
• Bridge 2048 Rehabilitation Road-Over-Rail at km24.6 on N11-8
• Bridge 4804 Rehabilitation over Skulpspruit Tributary at km23.7 on N11-5

Transportation
Roads
Rail
Airports

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