공기단축을 위해 탑다운공법이 적용된 호주 초고층빌딩 VIDEO: How and Why Sydney, Australia’s Next Tallest Building is Using the Top Down Construction Method

How and Why Sydney, Australia’s Next Tallest Building is Using the Top Down Construction Method

July 19, 2018 Shane Hedmond

One of the best parts (for me, anyway) of large developments that cost hundreds of millions of dollars being built is being able to learn about different construction methods that can reduce costs or deliver the project sooner than traditional methods.  The Crown Sydney, a future 890 foot tall tower in Australia, is using a method called “top down construction” to shorten their project schedule and avoid additional hazards on the $740 million project.

via Youtube

공기단축을 위해 탑다운공법이 적용된 호주 초고층빌딩

수억달러의 건설 비용이 드는 대규모 개발의 장점 중 하나는 빠르고 비용을 줄일 수 

있는 다양한 건설방법에 대해 배울 수 있다는 것이다.

호주의 7억 7천만달러의 대형 프로젝트인 267m 높이의 타워인 크라운 시드니 건설공사는 

"탑다운 공법"을 사용해서 공기를 단축시키고 추가적인 위험요소를 피하고 있다

* 탑다운 공법 top down construction

지상에서 지하로 내려가면서 공사가 진행되는 공법.

지상층과 지하층을 동시에 공사할 수 있어 공사 기간을 

단축할 수 있을 뿐만 아니라 굴착 소음과 분진을 방지해 

주변의 불편을 줄일 수 있다.

**아래 탑다운 개념도 참조

황기철 콘페이퍼 에디터 큐레이터

Ki Chul Hwang, conpaper editor, curator

When I first heard the term “top down construction,” I immediately thought of a recent project in Canada in which the roof was built first and hydraulic lifts were used to raise the roof as more levels were added. However, after learning more about it, calling the process the new Australian tower is using “top down” is a little misleading. It’s more of an “up and down method.”

In top down construction, the finished floor slap is completed first, which then allows the substructure (below ground) and the superstructure (above ground) to be worked on at the same time.  Prior to excavation of the substructure, a retaining wall around the perimeter of the building footprint is installed along with other structural elements that will eventually support the full structure.

Following the installation of the foundation system, the ground floor slab is poured, leaving an area open to allow for equipment and spoil materials. Once the ground floor slab has reached sufficient strength, work then begins below surface and above surface at the same time.

top down construction conception/SlideShare

edited by kcontents

In the specific case of the Crown Sydney tower, this construction method solved additional problems other than schedule, according to The B1M. The site on which the tower is being constructed was an environmental hazard due to it being used as an industrial plant in its previous life.  By covering the footprint of the building first, it reduced the amount of soil exposed to the element and reduced the need to cover the contaminated areas.

As you’ll see in the video below, contractors building the Crown Sydney use a gantry crane to lift sealed containers of spoils above the surface and load them onto trucks to be transported off site. Workers on site do have to wear a high level of protective equipment due to the contamination, but are not exposed to the elements as they typically would be using traditional methods.

constructionjunkie

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