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Top Down Constuction Method pps

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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  Sch

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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

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Diaphragm Wall Installation

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Conventional Open-cut & Bottom-up

Construction Method (For

comparison with Top-Down Method)

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Top-Down

Construction

Method

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Top-Down Construction Method

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Main Advantage of Top-Down Construction

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Details of Top-Down

Construction Method

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Excavation to Level -1

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Excavate to Level -2

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Compaction and leveling of

basement slab for reinforcement

and concrete works

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Circular ramp beam and wall

supported on bored column

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

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Excavation of Ramp Level -3 to - 4 in progress

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More excavation work in progress

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More excavation work of lower levels inprogress

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Above ground, structure works in progress

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Typical basement reinforcement slab ready for concreting

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Top-down construction work in progress

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Complete construction of project

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Another example of top-down construction

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Another example of top-down construction

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 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

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