자유의 여신상이 있는 뉴욕 리버티(Liberty)섬의 하수관로 및 물품질을 향상시키기 위한 프로젝트 공사가 공식적으로 시행되었다. 이는 섬의 상하수도를 점검하기 위한 저지시티(Jersey City) 지역 공익 프로그램의 일환으로 국립공원 서비스와 엔지니어링 컨설팅 회사인 Hatch Mott MacDonald(HMM)에 의해 진행된다.

 

손상에 취약하고 보통 크기보다 작았던 기존의 하수관로의 설계를 새롭게 할 방침이며, 새로운 설계방식은 뉴욕항구를 기반으로 수평면 방향의 드릴링(drilling) 장치를 이용해  2천4백 피트 길이의 하수관로를 설치할 계획이다.

 

 

 

Construction has officially begun on a project to upgrade critical water and sewer lines serving Liberty Island, the site of the Statue of Liberty, in New York City, N.Y.

 

The Jersey City Municipal Utilities Authority provides water and wastewater service to the island, which is operated by the National Park Service, and has retained Hatch Mott MacDonald (HMM), a full-service consulting engineering firm, to design replacements for the existing water and sewer lines, which were undersized and are vulnerable to damage.

 

The new design includes the use of horizontal directional drilling to install separate 2,400-foot-long water and sewer lines through the bedrock of New York Harbor. Three thousand feet of water pipe and sewer force main will also be installed within Liberty State Park, using pipe-bursting techniques. Further, interruption of service would require closing the island, which receives more than 4 million visitors per year.

 

The project design is challenging due to the extremely limited construction area on Liberty Island. HMM performed eight geotechnical borings to determine the quality of bedrock, recommended the use of conductor casings on each end of the HDD crossings, designed temporary systems to maintain service during construction, obtained necessary permits, and coordinated with Liberty State Park and Liberty Island to maintain visitor access during construction.

 

[출처 = Water World / 2015년 6월 2일]