Design Solution · Construction Methods
Design Solution · Dream about it
Sprayed concrete primary lining for tunnelled stations.
Quick-setting, steel-fibre-reinforced concrete is sprayed directly onto freshly excavated ground to form the primary tunnel structure. It avoids segmental rings in complex caverns and lets station volumes be shaped freely. The method suits the irregular geometries of deep interchange stations.
Steel-fibre-reinforced sprayed concrete — applied directly to freshly excavated ground as a primary lining — is a mature tunnelling technique that allows station caverns to follow complex or irregular geometries that segmental ring construction would struggle to accommodate. The method is fast relative to traditional ring-and-bolt sequencing and gives design teams freedom in shaping interchange volumes, concourses and cross-passages without being constrained to circular sections. That said, this record carries no provided evidence and the claimed performance rests entirely on the description; the actual outcome at any specific station is not substantiated here. Sprayed concrete demands very close quality control on mix design, fibre distribution, rebound, and application thickness — variations in any of these affect structural performance and crack-width predictions in ways that are hard to detect without systematic inspection. The ground conditions, depth and hydrogeology of a specific project will determine whether the method is appropriate at all, and residual ground movement after application affects long-term lining behaviour. The technique is well-established in the industry and merits consideration for deep interchange stations; confirmation of the project-specific geotechnical case and a clear quality-assurance regime are the pre-conditions.
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