About Us

TBM Tunneling Since 1991

Super Excavators, Inc. began back in 1950 when Ray Schraufnagel and Roy Lemke started a plumbing business together. As the Milwaukee Metropolitan area grew, so did Super Excavators. Growing into larger, tougher, deeper open cut utility projects as cities began to expand. Over the years Super had grown a very good reputation for our quality of work.

In the 1970’s and 1980’s Super Excavators performed small tunnels by hand mining or even small TBM’s. Bob Schraufnagel took over the business from Ray and continued to build the business expanding beyond the Wisconsin borders all the way to Albuquerque, New Mexico. In the early 1990’s the first large project was landed in Kenosha, WI. Jeff Weakly began a trend to build our tunneling business. Even though the deep tunnel work was now complete, there were still smaller projects to build in the Milwaukee vicinity. Super Excavators grew larger into the tunneling world job by job and continued on building our good reputation beyond just Wisconsin.

We have now built tunnels across the entire United States from San Francisco to Delaware and Alabama to Chicago. We are performing large TBM projects up to 23 feet in diameter, Microtunnel Projects, Pilot Tube Microtunnels, and bored casings. Everyone at Super Excavators takes a great deal of pride in their work and this shows in our success and satisfaction of our customer base.

Strategic Partnerships

  • Super Western, Inc.

    Super Western, Inc., a sister affiliation of Super Excavators, has been providing civil construction services to private owners, companies, and public agencies since 1998. SWI specializes in a variety of services including parking lots, building sites, private roads, residential and commercial land developments, and local street and highway projects.

  • Akkerman Inc.

    For forty years, Akkerman has developed, manufactured and supported quality pipe jacking and tunneling equipment that accurately installs a variety of underground infrastructure. Over the years, they have expand the range of sizes, ground conditions and complexities in which their systems perform. They are the only US manufacturer of microtunneling equipment. SEI has looked to Akkerman for pipe jacking and microtunneling solutions for nearly thirty years and currently own four complete microtunneling systems.

  • CAT

    Caterpillar Tunneling Canada Corporation, previously known as LOVAT, is an established global leader in mechanized tunneling technologies through various geology from soft ground to hard rock.  Caterpillar Tunneling custom designs and manufactures tunnel boring machines (TBMs) and other support equipment to the unique needs of the most extreme global tunneling challenges.

  • NUCA

    NUCA, the National Utility Contractors Association, is the leading trade association working solely for the utility construction and excavation industry in the United States.  NUCA's nationwide network of state/regional chapters and member companies represent utility contractors, excavators, and other providers in the water, sewer, gas, electric, and excavation industries.


    With more than 60 years of innovation and experience, The Robbins Company is the world’s foremost developer and manufacturer of advanced, underground construction machinery

  • Siepmann Realty Corporation

    Whether the development of a residential neighborhood, office complex, industrial park, condominium grouping, single family dwelling or specialty retail shopping center, Siepmann Realty brings out the best nature has to offer in each development.

  • Wisconsin Underground Contractors Association

    WUCA, the Wisconsin Underground Contractor’s Association, is a trade organization representing company members operating in the state of Wisconsin to improve water and sewer, gas distribution, and communications systems.  Super Excavators is an active member of WUCA, and SEI’s President, Jeff Weakly, also acts as President of the organization.

  • Hobas® Pipe USA

    Hobas Pipe is a leading producer in pipe systems, and their products are suitable for virtually every installation method of new construction and rehab.  Their CFRP mortar pipe is inherently corrosion resistant and lasts 100 years or more.  Hobas Pipe USA has been providing pipe to Super Excavators since 1998, and together they have completed many successful projects.


Super Excavators, Inc. is a union employer, and signatory to multiple unions nationwide.