earth support

3,584 views
3,365 views

Published on

Published in: Technology, Business
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
3,584
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
210
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

earth support

  1. 1. earth supports
  2. 2. Use of plastic sheets for slope protection in a shallow excavation
  3. 4. E A R T H W O R K S U P P O R T S TIMBER PLANKING TIMBER SOLDIERS
  4. 5. E A R T H W O R K S U P P O R T S STEEL SOLDIER PILES TIMBER PLANKING
  5. 6. E A R T H W O R K S U P P O R T S
  6. 7. Excavation supports using soldier beam and lagging.
  7. 8. Two examples of soldier beams and lagging method used for retaining walls
  8. 9. Two examples of soldier beams and lagging method used for retaining walls
  9. 10. Examples of soldier beams and lagging method used for retaining walls
  10. 11. STEEL SHEET PILING
  11. 12. E A R T H W O R K S U P P O R T S
  12. 13. STEEL SHEET PILES
  13. 14. E A R T H W O R K S U P P O R T S STEEL SHEET PILES
  14. 15. Bracing for shallow trenches (a) intermittent sheeting and bracing
  15. 16. Bracing for shallow trenches. (b) continuous sheeting and bracing,
  16. 17. Bracing for shallow trenches. (c) trench shielding
  17. 18. A typical trench box
  18. 19. Soil Nailing Examples
  19. 20. Soil Nailing Examples
  20. 21. Soil Nailing Examples
  21. 22. Schematic diagram of narrow excavation bracing
  22. 23. Internal struts
  23. 24. Support for Rakers
  24. 25. Raker bracing for wide excavations
  25. 26. Excavation sub-grade Ground surface Grout or transfer materials Stressing unit Sheeting Tendon 10-20 0 Bond free zone Assumed surface of sliding wedge Tieback installed at 10 to 20° down from horizontal
  26. 27. Tied-back concrete wall constructed underground for excavation support
  27. 28. Tieback being installed
  28. 29. Tieback Examples
  29. 31. GROUND FREEZING
  30. 32. Ground freezing is a technique that has been used extensively for groundwater control and excavation support in the underground construction industry for over 100 years.
  31. 33. The process involves the circulation of a refrigerated coolant through a series of subsurface pipes to convert soil water to ice, creating a strong watertight material. The material is so strong, in fact, that it is routinely used as the only method of groundwater control and soil support for the construction of shafts hundreds of feet into water-bearing soils.
  32. 34. Most ground freezing systems are quite similar in principal. The single most important co mponent of a ground freezing system is the subsurface refrigeration system , consisting of a series of refrigeration pipes installed with various drilling techniques. Depending upon the application, the coolant can be brought to temperatures well below -150 degrees celcius Ground freezing can be achieved by using either a large portable refrigeration plant or liquid nitrogen . After the initial freezing has been completed and the frozen barrier is in place, the required refrigeration capacity is significantly reduced to maintain the frozen barrier.

×