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Liantang tunnel project with single-sided climbing solution for gravity walls
Civil Engineering and Development Department, HKSAR Government (Hong Kong Special Administrative Region) Contractor Dragages Hong Kong Ltd.
Gravity walls to the tunnel entrance, up to 14 m high, poured using a single-sided adaptation of the MGC guided climbing system and Mammut 350 wall panels.
The Project
Summary:
Bouygues subsidiary Dragages Hong Kong is building the new two-tube motorway tunnel that is part of the new border cross point Liantang/Heung Yuen Wai project between Hong Kong and China. Once completed, the tunnel will be Hong Kong’s longest road tunnel.
A two-lane main connecting motorway running through the 4.8 km long Liantang tunnel leads from the Fanling intersection to the new Sha Tau Kok interchange. Administrative buildings and ventilation facilities are part of the ambitious building project.
The Solution
Single-sided climbing under extreme conditions
MEVA engineers faced a big challenge on the gravity walls leading to the entrance of the tunnel: For reasons of speed, these were to be climbed. Climbing 14 m high walls and anchoring into bedrock proved to be the really tricky part. The rail-guided climbing system MGC was modified to cater for this single-sided approach, including a unique anchoring and bracketing technique to handle the exceptional pressures of fast, high concrete pours. That solved, the next challenge was to integrate the safety and speed of railguided climbing with the constraints of single-sided pours and, in addition, enable the formwork on the climbing platforms to be moved back and forth by carriage. The Mammut 350 wall formwork’s load capacity of 100 kN/m² allows for any pour speed up to a height of 4 m regardless of concrete type and temperature when used on double-sided walls. Here, the strength of the Mammut 350 system allows Dragages to cast up to 3 m high single sided pours
Featured Products
- Wall formwork system Mammut 350
- All-plastic facing alkus
- Rail-guided climbing system MGC
Project
4.8 km long Liantang tunnel for border crossing point Liantang/ Heung Yuen Wai
Owner
Civil Engineering and Development Department, HKSAR Government (Hong Kong Special Administrative Region) Contractor Dragages Hong Kong Ltd.
Formwork engineering
MEVA Formwork-Systems, Haiterbach, Germany
