2015-07-21
344
I. Decide whether the following statements are true or false according to the text:
1 The lifting process is the most complicated in bridge construction.
2 Care should be taken during the lifting of the suspended span.
3 Accidents may happen in spite of correct instructions.
4 The temporary rigid connections were removed when the cantilever arms were constructed.
5 The stress in the top chord of the beam completely disappears.
6 Cranes are widely used to lift sections of. prestressed concrete bridge.
7 One of the most popular methods in bridge construction is to turn the span into an arch until closure is complete.
8 The casting of each segment is done on the construction site.
9 Each segment is placed after steel prestressing wires are fitted to hold it in position.
10 The post-tensioning method is called so because the stress is added before placement.
II. Answer the questions:
1 Why are heavy objects suspended in space dangerous?
2 What do incidents show?
3 How was the Forth railway bridge constructed?
4 When were temporary rigid connections removed?
5 When does the bending moment at the join completely disappear?
6 How are some continuous box girder beams constructed?
7 What are the methods of lifting sections of a segmented prestressed concrete bridge?
8 How is the casting of each segment done?
LANGUAGE FOCUS
III. Match the words with their synonyms:
| 1 Beam 2 Dangerous 3 Get 4 Disappear 5 Section 6 Subject 7 Film 8 ensure | A receive B vanish C expose D pellicle E provide F part G girder H perilous |
IV. Match the words with the opposites:
| 1 Vertical 2 Complicated 3 Final 4 Fortunately 5 Slowly 6 Previous 7 Place 8 Joint | A unfortunately B quickly C remove D horizontal E subsequent F simple G separation H initial |
V. Fill in the prepositions:
To be … the final position, the lifting … sth., the end … sth., an exception … sth., … the case of, … the middle, to do … great care, to change … sth. … sth., to rest … sth., to turn … sth., to add … sth., to be equivalent … sth.
VI. Make the precis of the text
