STL, a strategic collaboration between Kabbani Construction Group (KCG) and CONCORD for Engineering and Contracting, was established to deliver advanced pipe jacking and micro-tunneling solutions that meet the growing infrastructure demands of Saudi Arabia. By combining KCG’s expertise in underground utility construction with CONCORD’s specialization in tunneling, STL offers fully integrated, end-to-end solutions for complex and high-stakes infrastructure projects.​

Utilizing cutting-edge technologies and a highly skilled workforce, STL has successfully executed major tunneling projects, including in congested urban environments and nationally significant sites such as the Suez Canal. STL’s pipe jacking systems enable safe and precise installation of sewer, water, and cable infrastructure beneath roads, railways, and waterways—with minimal surface disruption and full real-time monitoring.​

In addition, STL offers advanced segment lining systems that outperform traditional pipe jacking methods, especially for tunnels larger than 3500mm or involving curved alignments, ensuring durability, safety, and engineering excellence.​