rehabbed in a future DPW contract. The general contractor that was awarded the construction bid used the provided horizontal alignment information to work with a pipe supplier to best determine the work shaft locations and length of pipe that could be slipped into place from each location. One work shaft was located downstream of a radius that enabled the contractor to slip pipe in both directions. In the tangent direction full 20-foot pipes were used. In the direction of the radius the contractor chose to use 10-foot sections, which allowed them to push the pipe through one radius, through a tangent section and then through the second radius. A second work shaft was located upstream of this An example of a sinkhole that developed in June 1997 as a result of an aging CSO pipe system. Photo: City of Milwaukee Dept. of Public Works
radius where the contractor was able to again use 20-foot pipe sections to connect to the 10-foot section at the end of the radius. Having access to cross sections and a 3D surface of the existing pipe allowed the DPW’s engineers to quickly review the contractor’s shop drawings and proposed slip lining procedure while providing staff with a sense of confidence that no surprises would be encountered during construction. This project was a great success for the City of Milwaukee DPW because of the general contractor’s methods, work shaft location and pipe length selection. The project’s schedule and budget were based on previous slip lining work contracted by the City, and the work was completed in roughly half the time scheduled and under budget. A contractor works to install a fiberglass mortar pipe slip line segment into an existing large diameter CSO pipe. Photo: City of Milwaukee Dept. of Public Works
S t r u c t u r a l E n g i n e e r s A x i o m # 7 Structural Engineers Axiom #7
Professional Liability is essential. Overpaying is not. Professional Liabi ity is Essential. Overpaying s Not.
I t pays to have the right profes- sional liability coverage. But you shouldn’t overpay. At Fenner & Esler, we’re more than just brokers. We’re A/E specialists. Delivering the right coverage and value to design firms of all sizes since 1923. With multiple insurance carriers. At Fenner & Esler, we’re more than just brokers. We’re A/E specialists. Delivering the right coverage and value to design firms of all sizes since 1923. With multiple insurance carriers. And a proven track record serving the unique risks of structural engineers. And a proven track record serving the unique risks of structural engineers. It pays to have the right profes- sional liability coverage. But you shouldn’t overpay.
Get a quote—overnight. Visit: www.fenner-esler.com Click “Need a Quote” Call toll-free: 866-PE-PROTEK (866-737-7683 x. 208) Ask for Tim Esler. Email: tesler@fenner-esler.com tim@Insurance4Structurals.com ww .insurance4structurals.com Get a quote—overnight. Visit: w.insurance4structurals.com lick “Need a Quote” ll toll-free: 866-PE-PROTEK ( 66-737-7683 x.208) Ask for Tim Esler. Email: tim@Insurance4Structurals.com
JON CHAPMAN , senior project manager at raSmith, served as the project manager for the City of Milwaukee Combined Sewer Overflow (CSO) project. He has more than 27 years of experience in LiDAR (3D laser scanning), UAS, and 3D visualization services. Jon is also an FAA Certified UAS Pilot. raSmith is a multi-disciplinary consulting firm comprising civil engineers, structural engineers, land surveyors, development managers, landscape architects, and ecologists. ROBERT SELEEN is a floodplain hazard mitigation manager in the environmental engineering section at City of Milwaukee Dept. of Public Works. He has worked in the Milwaukee area for over 15 years as a laborer, surveyor, inspector, and professional engineer for private companies and local government. His dedica- tion to water quality improvement projects is based on his desire to ensure future generations can enjoy Wisconsin and all of its beauty.
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november 2020
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