Caissons

Caissons

1. 028 CAISSONS . http://www.cpi-team.com

2. Science Art Religion Politics Scholarly Articles For Mathematics and Productivity http://www.twitlonger.com/show/n_1sp9pjo?new_post=true MICROSOFT OneDrive PPT’s PDF’s BOOK LESSONS Dr f Dejahang BSc CEng, BSc (Hons) Construction Mgmt, MSc, PhD

3. Caisson http://www.youtube.com/watch?v=N3msAkpUumI&feature=related http://www.youtube.com/watch?v=6OAHO9zgeXM&feature=related

4. WHAT IS CAISSONS?

5. WHAT IS CAISSONS?

6. WHAT IS CAISSONS?

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15. TYPES OF CAISSONS

16. ADVANTAGES  &  DISADVANTAGES ADVANTAGES

17. ADVANTAGES  &  DISADVANTAGES ADVANTAGES

18. DISADVANTAGES

19. Caisson Foundations A drilled pier is- a deep foundation system that is constructed by placing fresh Concrete and reinforcing steel into a drilled shaft.

20. Caisson Foundations The shaft is constructed by rotary methods using either a self-contained drill unit or a crane mounted drill unit. The hole is advanced through soil or rock to the desired bearing stratum.

21. CAISSONS Temporary or permanent steel casings may be used to maintain the sides of the drilled excavation-if caving soils or water infiltration becomes a problem. Drilled shafts can be used to sustain high axial and lateral loads. Typical shaft diameters range from 18 to 144 inches .

22. CAISSONS Caisson foundations are similar in form to pile foundations, but are installed using a different method. Caissons (also sometimes called “piers”) are created by auguring a deep hole into the ground, and then filling it with concrete.

23. CAISSONS Steel reinforcement is sometimes utilized for a portion of the length of the caisson. Caissons are drilled either to bedrock (called “rock caissons”) or deep into the underlying soil strata if a  geotechnical  engineer finds the soil suitable to carry the building load.

24. CAISSONS When caissons rest on soil, they are generally “belled” at the bottom to spread the load over a wider area. Special drilling bits are used to remove the soil for these “belled caissons”.

25. CAISSONS Drilled shafts (also called caissons, drilled piers or bored piles) They have proven to be a cost effective excellent performing deep foundation system, that is utilized world-wide. Typically they are used for bridges and large structures, where large loads and lateral resistance are major factors.

26. CAISSONS Caisson foundations are used when soil of adequate bearing strength is found below surface layers of weak materials such as fill or peat. A caisson foundation consists of concrete columns constructed in cylindrical shafts excavated under the proposed structural column locations. The caisson foundations carry the building loads at their lower ends, which are often bell-shaped

27. THE PROCESS: BUILDING A CAISSON

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34. CAISSONS Fig below: A series of 1.2-metre thick diaphragm wall panels were joined to form a 24-metre diameter caisson shaft. Four of these caissons were built to provide a sound base for the foundation of the main structure of the building tower .

35. Caisson is being drilled on Site

36. Caisson sleeve being moved to newly drilled caisson

37. Concrete Pump Truck used to place concrete to inaccessible areas

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39. Concrete being poured into caisson with slurry mix.

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41. Finished Caisson

42. Straight Shaft Drilled Piers (Caissons)