civil engineering- top down construction method

1. INDUSTRIAL TRAINING
ON
TOP-DOWN
CONSTRUCTION METHOD
PRESENTED BY:-
AMULYA KANSAL
(1009000010)

2. 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.

3. TOP-DOWN CONSTRUCTION METHOD
o 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

5. TOP-DOWN
CONSTRUCTION
METHOD

8. TOP-DOWN CONSTRUCTION METHOD

9. MAIN ADVANTAGE OF TOP-DOWN CONSTRUCTION

10. DETAILS OF TOP-
DOWN
CONSTRUCTION
METHOD

11. EXCAVATION TO LEVEL -1

12. EXCAVATE TO LEVEL -2

13. COMPACTION AND LEVELING OF
BASEMENT SLAB FOR
REINFORCEMENT AND CONCRETE
WORKS

14. MORE EXCAVATION WORK IN
PROGRESS

15. CONCLUSION
o 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

16. THANKS …..