{"id":128438,"date":"2025-11-13T11:54:59","date_gmt":"2025-11-13T10:54:59","guid":{"rendered":"https:\/\/www.maccaferri.com\/id\/solutions\/primary-lining\/"},"modified":"2025-11-13T11:54:59","modified_gmt":"2025-11-13T10:54:59","slug":"primary-lining","status":"publish","type":"solution","link":"https:\/\/www.maccaferri.com\/id\/solutions\/primary-lining\/","title":{"rendered":"Primary Lining"},"content":{"rendered":"
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The primary lining phase is essential in providing stability and support to the tunnel structure<\/b> immediately after excavation. This temporary supporting lining involves steel reinforcing elements, such as H-Beam and Round Tubular automated tunnel ribs<\/a>, which are embedded in or filled with steel fibre-reinforced shotcrete<\/b>.
The automated tunnel ribs are engineered to conform to the tunnel’s contour and are designed to achieve the highest performance<\/b>, capable of withstanding the most extreme lithostatic pressures.
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A significant technological advancement in this process is the shift from manual labour to automation<\/b> in the installation of tunnel ribs. This evolution not only streamlines the construction process<\/b> but also enhances risk control<\/b>. By substituting manual labour with automated solutions, there is no need for personnel presence near the excavation face<\/b>, significantly improving safety conditions. This integration of advanced materials and automation represents a significant leap in tunnel construction, prioritizing both efficiency<\/b> and worker safety<\/b>.
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The use of steel fibre-reinforced shotcrete<\/b> during the primary lining phase marks a further advancement in tunnel construction technology. Our fibers, used to reinforce the shotcrete, ensure a uniformly distributed reinforcement<\/b>, significantly enhancing the structural integrity<\/b> of the lining. This method replaces the installation of welded mesh between the ribs, a process that poses considerable risks to the workforce involved. A revolutionary aspect is the use of the fibre-reinforced shotcrete to fill our automated Round Tubular tunnel rib<\/b>. This setup creates a synergy <\/b>between the steel of the rib and the concrete that provides a significantly enhanced mechanical performance.
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