Bridges

J&G has extensive experience in the design, construction supervision and maintenance of the following types of bridges:

• Road and rail overpasses
• Road and rail underpasses
• Road and rail river crossings
  
• Bridges under/over dual carriageways and ramps at interchanges
  
• Large viaducts
  
• Modest causeways and fords
  
• Box culverts
  
• Pedestrian bridges.
  

• Project identification
  
• Pre-investment studies
  
• Conceptual designs
  
• Feasibility studies
  
• Economic evaluation
  
• Site investigation and evaluation.
  

• Preliminary reports and designs
  
• Technical appraisals and advice
  
• Detailed designs
  
• Tender documents and bid evaluation
  
• Peer reviews of designs by other consulting engineers.
  

• Construction administration and management
  
• Day-to-day construction monitoring
  
• Quality assurance
  
• Materials testing
  
• Project management
  
• Training.
  
  

• Bridge management system - survey and reporting
  
• Maintenance management
  
• Repairs and rehabilitation
  
• Training
  
• Expert witness.

• Mhlahlane River Viaduct: 600 m long multiple concrete arch near Ulundi, in KwaZulu-Natal, on the Broodsnyersplaas to the Richards Bay railway line
  
• Groot River Bridge: 300 m long by 175 m high bridge deck with 189 m long open spandrel concrete arch on the national road near Nature's Valley in the Eastern Cape
  
• Mzimkulu River Bridge: 300 m long dual carriageway bridge on the national road near Port Shepstone in KwaZulu-Natal, built by the incrementally launched technique
  
• Durban Southern Gateway Viaducts: overpass structures on pile foundations.
  
• Swartkops River Bridge: Two 300 m long dual carriageway bridges on a trunk road near Uitenhage, built by stage construction technique.

J&G has received the following awards for bridges designed and constructed under their supervision:

• Mhlahlane River Viaduct (1987):
  - Commended by the Concrete Society of Southern Africa (CSSA) for the development of a proven design to produce a long, high viaduct of classical structural form
  - South African Institution of Civil Engineers (SAICE) Regional Award for Excellence in Civil Engineering
• Manning Avenue Bridge (1989):
  - SAICE Regional Award for Excellence in Civil Engineering
• Mkomaas River Footbridge (2007):
  - CSSA Fulton Award for Excellence in the Use of Concrete – category: Design Aspects
  - South African Association of Consulting Engineers Award for projects costing less than R5 million
  - Runner-up at SAICE Awards for Excellence in Civil Engineering (2008)
• Bosmansdam Road Footbridge (2007):
  - CSSA Fulton Award for Excellence in the Use of Concrete – category: Aesthetic Aspects