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TOP-DOWN CONSTRUCTION METHOD

TOP-DOWN CONSTRUCTION METHOD. Use of diaphragm wall as the side support for the earth Construction progress upwards and downwards at the same time Savings in construction time Schematics and pictures give ideas on ongoing activities during construction. Diaphragm Wall Installation.

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TOP-DOWN CONSTRUCTION METHOD

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  1. TOP-DOWN CONSTRUCTION METHOD • Use of diaphragm wall as the side support for the earth • Construction progress upwards and downwards at the same time • Savings in construction time • Schematics and pictures give ideas on ongoing activities during construction

  2. Diaphragm Wall Installation

  3. Conventional Open-cut & Bottom-up Construction Method (For comparison with Top-Down Method)

  4. Conventional Open-cut & Bottom-up Construction Method (For comparison with Top-Down Method)

  5. Top-Down Construction Method

  6. Top-Down Construction Method

  7. Main Advantage of Top-Down Construction

  8. Details of Top-Down Construction Method

  9. Excavation to Level -1

  10. Excavate to Level -2

  11. Compaction and leveling of basement slab for reinforcement and concrete works

  12. Circular ramp beam and wall supported on bored column

  13. Excavation work of Level -3 in progress, use of clamp-shell for exc.

  14. Excavation of Ramp Level -3 to - 4 in progress

  15. More excavation work in progress

  16. More excavation work of lower levels inprogress

  17. Above ground, structure works in progress

  18. Typical basement reinforcement slab ready for concreting

  19. Concreting of basement slab for top-down construction method

  20. Top-down construction work in progress

  21. Complete construction of project

  22. Another example of top-down construction

  23. Another example of top-down construction

  24. Conclusion • Need careful consideration for use in HCMC since method is new here • Ideal for 5 basements or more • May need some soil improvement techniques and good dewatering system • Equipment for these works may not be readily available in HCMC • Handling of excavated soil material require planning, keeping in mind marine clay at upper level and silty sand at lower level

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