foundation system of burj al arab

Bridge Foundation Scouring Scenario of New Zealand (Part-1)

We will discuss about foundation of bridge in this post and upcoming couple of posts. Here we will discuss mainly foundation scouring and its effects on foundation of bridge. Our concern is here New Zealand.

In simple word, scouring involve removal of material from river or other stream bed and bank of them as well, form foundations of bridges and essentially these are happened due to water flow. We will learn elaborately about scouring, its types and measures to avoid such phenomena.

Scouring results maximum damage to bridges and consequent failure of many bridges all over the world. Now we will learn some failures in New Zealand. Here we will discuss about some failures of bridges related to scouring failure-
Site plan of Bull’s Road Bridge
  1. Bull’s road bridge
  2. Waitangitaona river bridge
  3. Blackmount bridge
  4. Waipaoa river rail bridge
  5. Oreti river bridge
  6. Bullock creek bridge etc.
Of these we will discuss first four bridge failures.
Collapsed Bull’s Road Bridge

a. Bull’s Road Bridge

  • On Rangitikei River
  • State highway -1

Failure date: 15th June in 1973

Causes of failure:
  • Scouring produced one pier to collapse
  • Structural hinging

Waitangitaona River Bridge:

  • On Waitangitaona River
  • State highway-6
Failure date: 12th march in 1982

Causes of failure:
  • One pier washed out
  • Two spans of this bridge lost due to accumulation of debris resulting severe scouring with flow concentration around these pier.
Site plan of Waitangitaona River Bridge
Dear reader we will provide information about rest two bridge failure and cost involvement in highway department to countermeasure scouring related bridge foundation failure.

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