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TOP-DOWN CONSTRUCTION METHOD - PowerPoint PPT Presentation


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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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    Presentation Transcript
    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