2015-07-21
393
I. Decide whether the following statements are true or false according to the text:
1. The construction of an overpass beam bridge with one support begins with excavation.
2. Wooden beams are usually made on-site.
3. Metal pieces provide a connection between beam and slab.
4. A plate girder consists of separate top and bottom flanges.
5. Beams for short and long spans are usually of a constant depth.
6. Arches are made in a factory, shipped to the site and set in place by cranes.
7. When the ends at an arch meet, the cables or falsework are removed.
8. Foundations of suspension bridges are made by sinking caissons.
9. Suspension bridge towers have always been made of steel.
10. An anchorage is a length of metal with a hole at the ends.
11. Spinning is done by cables that carry each wire across the top of the towers to the opposite anchorage and back.
12. For steel cantilever bridges the steel frame is built out from the abutments toward the towers.
13. Falsework is not used in the construction of cantilever bridges.
14. Cable-stayed and cantilever bridges are built in the same way.
II. Answer the questions:
1. What does the construction of beam bridges begin with?
2. Where are steel beams made?
3. What are metal pieces used for?
4. What is the difference between beams for short and long spans?
5. When are the cables or falsework removed?
6. How are foundations for bridges requiring piers made?
7. What is an eyebar?
8. What is done to prevent corrosion of the wires?
9. How is the steel frame built for cantilever bridges?
10. What does the cantilever method consists of?
11. What is done to avoid the need for falsework?
LANGUAGE FOCUS
