Bridges and overhead pedestrian crossings.

In the bridges, the rolling surface is supported by two main beams. These beams are formed of a specific number of panels bolted together end to end and connected on the sides when necessary by tie elements to form beams.

The cross beams that support the supports are placed on the lower chords of the panels, connecting the main beams and maintaining the correct separation between them while supporting the support's reinforcement.

Several tie pieces complete the structure.

The simplest bridge is that in which only one row of panels along each side of the structure forms the beams. This type of bridge is called a Simple-Simple.

If we add to this bridge another row of panels on each side, it becomes a Double-Simple bridge. If two rows of panels are added above this bridge, it becomes a double decker bridge and is called a Double-Double. With this same criteria we could form a Triple-Simple or a Triple-Triple bridge if necessary depending on the span and load.

In this way the strength of the bridge is reinforced. The system for erecting the bridges is by assembling the pieces, forming the complete bridge on one bank on wheels, sliding the structure on the wheels and launching it forward through the launching mechanism. Or once the bridge structure has been built it can be lifted into place by a crane.

Tower structures

By standing the panels on end, they are changed from a beam type element to a tower type piece.

Therefore, the construction of the tower is the same as building a bridge except that it is erected vertically instead of horizontally.

The type of tower used the most is the "Four Panel Tower". Basically, it is erected as follows:

Four Acrow panels standing on end are connected together at right angles. An angle support is used to bolt the 4 panels together. One of these angles is necessary for each corner every 1.52 meters in height, that is, eight supports are required for each box formed of four panels. The base of the tower is fixed to the running foundation with anchor bolts.