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TBS Soest

Dutch manufacturer of cast iron and concrete drainage products for road and water engineering, known for its TBS-branded manhole covers.

Last updated September 29, 2026

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Overview

TBS Soest is a Dutch manufacturer of drainage products for road and water engineering, based in Soest, Netherlands. The company was founded in the early 1930s by O. Zimmerman as the Technisch Bureau voor gietijzerproducten Soest (TBS). Initially, it produced only cast iron gullies and manhole covers. During the years before World War II, iron became scarce and expensive, prompting Zimmerman to experiment with combining cast iron and concrete. He obtained a patent for his design of anchoring cast iron in concrete, which formed the basis for the company's success. In the 1960s, Zimmerman's son-in-law took over TBS, and the company began to grow rapidly. It soon became the market leader in the Netherlands for gullies, manhole covers, slides, and check valves. Since the 1980s, TBS Soest has been the Dutch market leader in these product categories. In addition to cast iron and concrete, the company now also works with high-grade polyethylene plastic. Internationally, TBS has made its mark; for example, it recently installed 4.5-meter-wide check valves in concrete drainage channels in Hong Kong to prevent seawater from entering the city during high tide. TBS offers more than 200 drainage products, including manhole covers, various types of gullies, gutters, and gutter covers. The TBS brand has stood for absolutely reliable quality for more than 85 years. The drainage products are used nationally and internationally. TBS products are known for being high-quality, functional, and long-lasting. The company has its own service department that operates nationwide, ensuring products continue to function optimally and providing advice based on knowledge and experience. According to the company, 98% of its customers are very satisfied with its service. TBS supplies quality products for road and water engineering. These products are distinguished by their unique technical solutions that ensure a long service life. The company offers an easy online specification tool to save time for infrastructure projects. In 1990, TBS became part of Ballast Nedam. In 2017, it was acquired by investment company Triacta, and in 2020 it became part of the TBS-SVA Groep.

History

TBS Soest was founded in the early 1930s by Mr. O. Zimmerman as the Technisch Bureau voor gietijzerproducten Soest (TBS). Initially, the company produced only cast iron gullies and manhole covers. In the years before World War II, iron became scarce and expensive. Zimmerman therefore experimented with combining cast iron and concrete and obtained a patent for his design of anchoring cast iron in concrete. This formed the basis for the company's success. From the moment Zimmerman's son-in-law took over TBS in the 1960s, the company began to grow rapidly. It did not take long before TBS became the market leader in the field of gullies, manhole covers, slides, and check valves. Since the 1980s, TBS Soest has been the market leader in the Netherlands for these products. In addition to cast iron and concrete, the company now also works with high-grade polyethylene plastic. Internationally, the company is also making progress. For example, TBS recently installed 4.5-meter-wide check valves in concrete drainage channels in Hong Kong to prevent seawater from entering the city during high tide. In 1990, the company became part of Ballast Nedam. In 2017, it was acquired by investment company Triacta, and in 2020 it became part of the TBS-SVA Groep.

  • 2020

    Became part of the TBS-SVA Groep.

  • 2017

    Acquired by investment company Triacta.

  • 1990

    Became part of Ballast Nedam.

  • 1980

    Became market leader in the Netherlands for gullies, manhole covers, slides, and check valves.

  • 1960

    Zimmerman's son-in-law took over the company, leading to rapid growth.

  • 1930

    Founded by O. Zimmerman as Technisch Bureau voor gietijzerproducten Soest (TBS).

  • 1930

    Obtained patent for anchoring cast iron in concrete.

Products and positioning

Market leader in the Netherlands for gullies, manhole covers, slides, and check valves; known for reliable, high-quality, long-lasting drainage products.

  • Manhole covers

  • Gullies

  • Gutters

  • Gutter covers

  • Slides

  • Check valves

  • Drainage channels

Sources3 sources

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