The design proposal is for a pedestrian bridge to cross the Wulanmulun River, located in Ordos city, Kangbashi district Mongolia.
The bridge consists of a main floating section which gives buoyant support to three expanding walkways, and a carbon fiber triple sail which is raised and lowered by the buoyancy rotator, the bridge is a flexible structure and can relocate by sailing along the river to its new location, it folds with multiple sections that stack into each other.

RTF Sustainability Awards 2017
Third Award | Category: Transportation (Concept)

©Margot Krasojevic Architecture

A hydraulic telescopic secondary structure supports the pedestrian walkway, expanding and contracting into the main body of the primary structure this movement depends on where the sail-boat bridge is berthed or sailing to; the bridge can be moored along the quayside, sailed into any location along the river or permanently positioned using Caisson foundations which are floated and sunk into position stabilising the bridge, screw-in moorings provide further stabilising along with nine ton anchors to prevent drift. The bridge’s flexible walkways adapt to different quays and spans across the river, expanding and folding accordingly; The hydraulic walkway is supported by the river banks landing docks whilst the main body of the bridge is kept afloat by the sail and it’s rotator, the walkway and ring frame’s weight distribution prevents capsize, the primary ring frame has eight marine floatation airbags to further stabilise the sail rotation.

©Margot Krasojevic Architecture

The sails are made from a lightweight aluminum frame clad in a carbon fiber reinforced polymer, they are suspended from a rotating Möbius ballast chamber hydraulically operated by a thruster to rotate and fill with water in order to revolve the sail and relocate the bridge, the rotating Mobius element is made from lightweight aluminium enveloped in stabilizer fins and photovoltaic cells which power the thruster, it consists of five ballast tanks which fill with water which rotate the sail from horizontal to vertical, the other four tanks are left filled with air so that the sail remains buoyant when used either as a bridge or sailed to a new position.
An array of cylindrical cross-flow turbines skim the water’s surface, acting as a raft their buoyancy helps support and stabilise the bridge’s primary structure.

©Margot Krasojevic Architecture

When the bridge is in use the sail is lowered and acts as a canopy over a seated area for people to enjoy the views and the platform gardens, it unhinges from the hydraulic triangular section ring frame and rotates into vertical position in order to sail down the river.

Solar panels line the walkway providing energy for the three electric motor generators, the bridge can be towed, sailed or motored into different locations along the Wulanmulun River.