HDD - IJ-crossing Amsterdam
Due to the construction of a new sewage treatment plant in Amsterdam, the present sewerage system was extended with a 49-km long pressurized sewage pipeline to transport the wastewater to the new treatment plant. The final piece in this gigantic project, which has become known as the “A4-project”, was a borehole drilled horizontally under the IJ. Visser & Smit Hanab carried out the drilling and the laying of the connected pipe sections.
![video - IJboring.jpg](/sites/vw_vs_hanab_drilling/files/styles/content_keyvisual_parallax_xsmall/public/webcomposer/5882--video%20-%20IJboring.jpg?h=6278ed9e&itok=YIBk2dE8)