River Bed Model in Fibreglass – Horizontal Scale 1:125,000, Vertical Scale 1:125

Commissioned by Cardiff University’s Engineering Department, this 6 metre x 4 metre fibreglass model of the River Severn Estuary and Bristol Channel river beds was a very technically demanding job, not just because of the huge volume of complex data involved but also because of the sheer size of the project. Comprising several large sections that bolted together, it had to be an accurate representation of the riverbed contours (at an exaggerated vertical scale) because it was being used for physical experimentation in a major research program on tidal power generation.

 

How we made it

The first stage was to create a “mirrored” negative (upside down and back to front) version of the river bed contours all the way from Gloucester, down the Bristol Channel as far as the open sea. This comprised six major sections and several smaller, infill sections. These contours were made from laser cut acrylic layers supported on an MDF substructure, all fixed onto a structural base board with upstanding sidewalls. To construct the accurate depths and contours we had to create our own CAD masterplan using a combination of traditional Admiralty Charts, CAD contour maps, reams of numbers giving spot depths, and numerous sections through the river bed at key areas.

Once the basic structures of the moulds were built, the contours then had to be blended into a smooth continuous “land-form” using various filling techniques. At the same time great care had to be taken to ensure the contours matched perfectly across the joins between the sections. The contours then had to be sealed and “polished” to a fine finish so that the fiberglass forms would come away cleanly from the moulds once they had cured.

The final stage was to layer up resin and fiberglass matting into the moulds, starting with the “gelcoat” layer (which is in effect the top layer and is the visible finished colour) and then several more layers of resin and matting to build up the structural integrity. The fibreglass sections were then eased out of the moulds and flipped the right way up, ready to be joined together on to a structural sub-frame which supported them all at the right height. The image shows the sections just after they have come out of the moulds. They had been loosely assembled on the floor to check for fit.

1:1250 Masterplan Model

Commissioned by the Welsh Assembly Government through an exhaustive tendering process, this model’s role was to illustrate the new infrastructure and planning proposals for a major new development area in the docks and coastal fringes of Llanelli, South Wales. The model showed new road links, new residential areas, and commercial development areas. It also used button activated fibre optic lighting to highlight six different development zones.

1:20 Model of Information Point

This model was used to help illustrate the proposed design of a new information booth. It had removable security screens and faithful representation of all the material finishes. Even the illumination was a scaled down representation of the proposed lighting system.

1:50 Floor Plan Layout

 

The purpose of this 1:50 scale floor plan model was to provide an "at a glance" explanation of the various apartment layouts on a typical floor of a large apartment complex. Showing indicative furniture and fittings in rooms and highlighting the communal areas, the 3D representation makes the internal spatial arrangement easy to understand for potential purchasers.

1:100 Part Section of School

The model was conceived and built within 9 days and subsequently formed part of a major presentation including 3 illuminated 1:500 site models showing 3 different school designs.