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| CONTENTS


Technical 18


18 10


Shaft where slipform secondary lining was performed on Thames Tideway West contract; focus of BTS Harding Prize Competition 2026 winning paper Credit: BMB JV


Comment 3 10 29 34 31 37 April 2026 | 5


34 37


REGULARS 6 News 42 Events


29 31


Shafts, Caverns BTS Meeting report Project: Prague Metro Line D Petr Makasek, Mott MacDonald


A report from the BTS meeting of June 2025 on station design with large- scale mined caverns being planned for Prague Metro’s new Line D.


BTS Harding Prize Competition Slipform success Matthew Gibson, BMB JV


The winning paper of the 2026 BTS Harding Prize Competition discusses the approach to construction of large-scale shaft slipform secondary lining at the Thames Tideway West contract.


ITA Report: Shaft construction


Review of the informative and detailed guidance from ITA-AITES on selecting shaft construction methods, considering water management, geology, lining, excavation and mucking out.


Power, Water Surging interest


Researchers calls for combinations of open and closed large shafts and caverns - and so more excavation - for superior damping of surge flows in hydropower projects.


Insight


Data, Digi, BIM Digital workflow boost


Planning and design for a large-scale programme of rehabilitation of motorway tunnel linings in Italy is getting an efficiency boost from enhanced digital workflows.


PREVIEW


World Tunnel Congress: Set for WTC 2026


Preview of the World Tunnel Congress to be held mid-May, hosted by Canada, in Montréal.


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