ULMA Construction 2017-09-01

Construction in record time with T-60 Shoring Towers: Lusail Boulevard Tunnel, Qatar

This project consists of the construction of a cut-and-cover road-rail tunnel, including the mechanical systems and services necessary for the A3 Expressway. The tunnel stretches 655 m in length, and is 45 m wide with three separate tubes. The central tube is dedicated to rail traffic, with two lines running in each direction. The project required 300,000 m³ of concrete.

The ULMA & DELMON team provisioned formwork for the walls and slabs of the central tube, measuring 20 m in width, as well as the lateral tubes, each of which are 13 m wide. The walls are 2 m thick at the base, and thin to 1 m at the highest point of 13 m. The ceiling slab, 1.8 m thick, was built to be straight though slightly inclined, throughout almost the entire length of the tunnel.

The client required that all tunnel sidewalls, even for those reaching 13m tall, be executed in a single pour. At these heights the fresh concrete can exert enormous pressure on the formwork, and with more than 3.6 km of sidewall to pour, the solution had to be robust yet quick to install and easy to use. Components of the beam formwork system ENKOFORM V-100 were used to withstand all of the pouring pressure required. In fact, the simplicity of the system provided a level of productivity that exceeded customer expectations.

The ceiling slab measuring, 30,000 mwith a thickness of 1.8 m, was built at a height of 9 m aboveground. The T-60 Shoring Towers proved ideal for this situationThe towers were combined with a pre-assembled table formwork system transported by bogie to save both time and work.

With our client’s requirements at the forefront, the solution that provided savings in the set-up and take-down for every pour. This is what made the difference in the customer’s choice of ULMA & DELMON for their project, and the final results were no less rewarding than initially promised.

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