도하 메트로 정거장 거푸집 공사의 '도전' Doha Metro main station construction 'challenging'

Nine metre high walls were created in one pour. Formwork had to be specially constructed for the job. 

Artist rendering of Msheireb and Education City stations, Samsung C&T

http://www.samsungvillage.com/blog/2013/06/21/samsung-ct-to-build-doha-metros-two-most-emblematic-stations-1/

케이콘텐츠 kcontents

현재 시공 중인 도하 메트로의 거푸집 공사는 매우 중요한 공정이다. 도하 메트로는 총 4개의 노선과 2개의 주요 정거장으로 구성되어 있으며 이태리 거푸집 전문업체 페리사가 이 2개의 정거장의 거푸집 공사를 수주하여 시공 중으로 2019년까지 완료하게 된다. 현장 거푸집 작업의 장점 중의 하나는 공간에 제약을 받지 않고 시공할 수 있는 점이다. 2개의 정거장을 시공하고 있는 삼성물산, QBC 와 공동 시공하고 있는 OHL의 한 엔지니어는  거푸집공사는 "현장여건에 따라서 시공 방법이 다르다. 프리캐스트 제작 시공은 원거리 운반하는 것이 불가능하기 때문에 현장 타설로 벽체를 시공해야한다.  이어 그는 교육시티 정거장 시공에 왜 이 방법을 택했는지 설명한다. "이 정거장의 벽체는 폭 1.5M 높이 9M다. 거푸집을 설치해 현장타설 시공을 해야한다. 일반적으로 벽체 콘크리타설은 4~6M를 먼저 시공하고 나머지는 다음에 시공하지만 현장여건과 품질관리를 위해 한번에 콘크리트 타설할 수 있는 이 거푸집 공법을 적용했다" 정거장은 길이 330M 폭 29M로 벽체 높이는 2.8M~9M로  다양하게 구성되어 있는데 특히 벽체의 마감과 구조적인 문제 그리고 안전을 고려해야 한다. 황기철 콘페이퍼 에디터

 

As Doha's new metro takes shape, the importance of formwork within the construction sector has come into focus As an integral part of the Qatar Rail Development Program (QRDP), the Doha Metro project will consist of four lines with the metro network extending over the Greater Doha area. It will have two major stations: Education City Station and the Msheireb Station. PERI has been awarded contracts for the formwork on both of those major stations and the project is due for completion in 2019. While one of the benefits of using formwork is that is can be cast off-site, freeing up space, this is not the case on the Doha Metro project.  Miguel Colomer Herrero, senior construction engineer, OHL, part of the JV with Samsung and QBC commissioned to build both of Doha’s metro stations, explains, “Every site is different and has its own challenges. This site obviously requires in situ casting as it would be impossible to move them from a remote location to the site.” Working on the Education City station, he explains why formwork was the method of choice for this construction: “The walls we have here can only be made with formwork because they are 1.5m wide and extend to an impressive nine metres-plus tall.” Dimitris Papendreou, PERI sales engineer and responsible for the Doha Main Metro project's formwork adds: “The main challenge here was casting the tremendously high walls in one pour of concrete. Usually walls are cast to between four and six metres in height, and then the remaining height is cast in a separate cycle. In this project however, for a variety of reasons, the walls were cast in one pour.” Herreo adds: “After extensive study of the project, the JV decided to cast in one pour as the client’s requirements dictated this option. The surface finish has to be exceptionally smooth and this would not have been possible in more than one pour as a seam between the two cycles would have been created. Also, this project is expected to be here for about 120 years, so one pour also ensures durability and the best result for waterproofing.” Papendreou concludes: “Any other method, such as pre-cast concrete was out of the question, as we also had to consider the finishing. It is also a structural choice and takes the safety of the site and end product into consideration.” The station is 330m long and 29m wide, while the height of the walls vary between 2.8m to nine metres. http://www.constructionweekonline.com/article-32524-doha-metro-main-station-construction-challenging/

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