topdownconstruction

INDUSTRIAL TRAINING ON

TOP-DOWN CONSTRUCTION

METHOD

PRESENTED BY:-AMULYA KANSAL

(1009000010)

WHAT IS TOP DOWN CONSTRUCTION ?

In this method, basement concrete slabs act as lateral bracing for the perimeter wall system. Ground level and first basement slabs are poured, with access holes left to allow excavation beneath. As each subsequent subgrade level is completed, the floors act as lateral bracing for the perimeter wall system.

TOP-DOWN CONSTRUCTION METHODo Use of diaphragm wall as the side support for the earth

o Construction progress upwards and downwards at the same time

o Savings in construction time

o Schematics and pictures give ideas on ongoing activities during construction

TOP-DOWN CONSTRUCTION METHOD

TOP-DOWN CONSTRUCTION METHOD

MAIN ADVANTAGE OF TOP-DOWN CONSTRUCTION

DETAILS OF TOP-DOWN CONSTRUCTION METHOD

EXCAVATION TO LEVEL -1

EXCAVATE TO LEVEL -2

COMPACTION AND LEVELING OF BASEMENT SLAB FOR REINFORCEMENT AND CONCRETE WORKS

MORE EXCAVATION WORK IN PROGRESS

CONCLUSIONo Need careful consideration for use in HCMC since method is new

here

o Ideal for 5 basements or more

o May need some soil improvement techniques and good dewatering system

o Equipment for these works may not be readily available in HCMC

o Handling of excavated soil material require planning, keeping in mind marine clay at upper level and silty sand at lower level

THANKS …..