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Construction of basement in Top-Down method

Technology particulars:

  • Top-down technology (downward) is the advanced method employed to substructure construction, other than the conventional method (upward).
  • 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.

Advantages:

  • Working space and construction duration: it is not required a large working space for foundation excavation and saving cost by eliminating to construct the retaining wall. Especially for public transport works as traffic tunnels, this method helps to soon re-established  trafffic road. And the top-down method of construction enables a high-rise superstructure and its sub-basement to be built simultaneously (popularly for civil works have basements) ----> accelerate construction.
  • It is not required of the temporary strutting system (Bracsing System) to support the basement walls during excavation and construction of basement. That is cost-saving for constructiion. Temporary strut system is often very complex problems of space and very expensive construction.
  • Construction schedules can be compressed by saving time in construction of substructures and high-rise superstructure at the same time (of course, we have increase the cost of strengthening the lower part, and if the "savings" schedule can not cover the "cost" for safety strengthening, it's not necessary to do quick, top-down first and then the high-rise superstructuresthe as seen in Hanoi. After construction of the ground floor, we can separate completely superstructure and underground construction. You can construct simultaneously the basements and the superstructure.
  • Foundation problems (the phenomenon of sludge, groundwater ...): attention that in dense urban areas of high-rise buildings, if open excavation (open cut) with diaphragm wall, deep foundation and water table to be lowered in the construction of the underground structures, adjacent buildings are not assured. (easily occur sliding roof excavation, subsidence, cracking ...), Top-down construction method to solve this problem.
  • Construction of the basement with groud floor was constructed at first can partly reduce the impact of bad weather.

 

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Projects using Top-Down Construction Method:

  • Vincom Shopping Centerm; #70- 72 Lê Thánh Tôn Street, District 1, Hồ Chí Minh City; Investor - Vincom JSC: construction area is over 10.000m2 with 06 level basement - the deepest basement in Vietnam.
  • Bitexco Financial Tower; #45 Ngô Đức Kế Street, District 1, Hồ Chí Minh City; invested by Bitexco: Construction of 03 level basement with depth of 17m close to Saigon River and 68 high-rise superstructure.
  • Royal City; #74 Nguyễn Trãi Street, Thanh Xuân, Hà Nội; invested by Royal City real estate investement and development JSC: construction area of 130.000m2 with 05 level basement
 

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"Safety - Quality - Progress - Cost Price" as corporate principle of Delta, we commit to providing the highest quality products, reasonable price and fully meet the requirements of the clients. By continuously implementing innovation in all activities, we are able to strengthen the satisfaction of the clients."

Trần Thành Vinh - General Director

Contact Info

Delta Civil & Industrial Construction Company Ltd

  • Address: 54 - 56 Tue Tinh Str., Hai Ba Trung District, Hanoi
  • Tel: +84 (4) 3821788
  • Fax: +84 (4) 39760988
  • e-Mail: delta@hn.vnn.vn
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