SAK 건설이 미국 미저리주 세인트루이스시의 노후된 합류거(combined sewer) 5천575ft를 갱생하는 920만 달러 계약의 작업에 착수했다.

벽돌과 석회암의 주요 부분의 갱생을 타겟으로 하는 이번 프로젝트는 미 육군 공병단과 세인트루이스 도심 하수구역(MSD)이 합동으로 기금을 댔다. 1860년대에 지어진 하수관의 갱생은 MSD가 세인트루이스의 하수관을 향상하기 위해 실행 중인 종합계획의 한 파트이다.

 

 

 

SAK Construction, LLC, (SAK), a provider of trenchless technology and tunneling solutions, has begun work on a $9.2-million contract to rehabilitate 5,575 linear feet of aging combined sewer in downtown St. Louis, Mo.

The project, which targets a major segment of the brick-and-limestone Old Mill Creek Sewer, is jointly funded by the U.S. Army Corps of Engineers and the Metropolitan Sewer District of St. Louis (MSD). Rehabilitation of the sewer, which was built in the 1860s, is part of a comprehensive plan that MSD is implementing to improve the St. Louis wastewater system.

 

According to Mike Badgley, SAK project manager, the contract includes renovating the 18-foot-high by 20-foot-wide arch-shaped sewer, 15 manholes and 58 lateral connections using chemical grout, concrete and shotcrete (a specialized spray-on wet or dry concrete solution that hardens in place, forming a structurally renewed surface). To complete the work, an estimated 3,200 cubic yards of concrete, 4,500 cubic yards of shotcrete and 400 tons of reinforced steel will be required.

 

Among the unusual challenges posed by the project is the sewer's significant average dry weather flow of 50 million gallons per day. "A combined sewer carries both sanitary and storm water. This means that heavy rainfall or a high river stage, in addition to the normal dry weather flow, can restrict working conditions within the sewer," said Mike Badgley, SAK project manager. To minimize potential issues and progress on schedule, SAK regulates the dry weather flow by using a combination of bypasses and flow diversions.

 

[출처 = Water World / 2015년 3월 10일]