Breakwaters and closure dams 14

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Breakwaters and closure dams 14

  1. 1. Chapter 14: construction methods formonolithic structuresct5308 Breakwaters and Closure DamsH.J. VerhagenApril 12, 2012 1Faculty of Civil Engineering and GeosciencesVermelding onderdeel organisatieSection Hydraulic Engineering
  2. 2. Use of caissons• Caissons as breakwaters• Caissons as part of closure dams • closed caissons • sluice caissons• Monolithic units composed from • small units • large units constructed in situ • large units, prefabricated and floated to final positionApril 12, 2012 2
  3. 3. typical block wall AlgiersApril 12, 2012 3
  4. 4. construction of the BrightonbreakwaterApril 12, 2012 4
  5. 5. dredged dock for caissonsApril 12, 2012 5
  6. 6. Foundations and abutments• preparation • bring bed to desired level and smoothen it • keep it that way • provide proper connection• after placing • load should be spread well • prevent piping • larger gap needed for turning in • verify on beforehand pressure differencesApril 12, 2012 6
  7. 7. stability of a floating caissonB= 9 m, H=12.5 m, wall thickness 0.5 m, concrete 24 kN/m3I=L*B3/12 = 60.75 m4 V = 39.6 m MC = I/V = 60.75/39.6 = 1.53 mmc = cb + MC - gb = 2.2 + 1.53 - 4.8 = -1.07 mWith Ballast: mc = 3.09+1.09 - 3.85 = 0.33 April 12, 2012 7
  8. 8. stability of of a floating caissonballasted with waterApril 12, 2012 8
  9. 9. placing a caisson in Veerse GatApril 12, 2012 9
  10. 10. caisson closure at Meldorf(Miele closure)April 12, 2012 10
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