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2. Where are self-powered jib cranes used ?

winches

tower cranes

hoists

jacks

XV. Answer the following questions using the introductory phrases.

1.What is the text about ?

2. What are self-powered jib cranes used for ?

3. What materials can self-powered jib cranes handle ?

4. How are self-powered jib cranes classified ?

5. What types of cranes are there ?

6. What are air-tyred and truck-mounted cranes provided with ?

7. Can tower cranes operate without outriggers ?

8. Does the lifting capacity of the crane drop sharply without outriggers ?

9. What are crawler, truck-mounted and air-tyred cranes driven by ?

XVI. Read and retell the text using the introductory phrases.

Crawler tractor and bulldozer

One of the basic machines used in road construction is a crawler tractor. It may be employed for many construction operations. A tractor is used for the transportation of construction equipment. Different kinds of equipment may be mounted on the tractor. Crawler tractors are generally powered by diesel engines. They may have different weight and power. Tractors which are used for road construction may have load lifting capacity from 5 to 20 tons.

Now a few words about bulldozers. Beside a crawler tractor there is a bulldozer. It consists of a curved blade (изогнутый отвал) which is mounted on the front of the tractor. The blade is fastened (крепится) to the tractor by means of two long beams. The bulldozer blade may be raised and lowered. It is wider than the tractor.

In order to (для того чтобы) dig a trench trenching machines are used. They dig trenches of 2 feet wide and 4 feet 6 inches deep. These machines are mounted on tracks. They have five forward digging speeds and one reverse.

XVII. Translate the following sentences into Russian.

1. При работе с грейфером кран может нагружать и разгружать гравий.

2. Основным признаком классификации самоходных стреловых кранов является способ их передвижения.

3. Ходовое оборудование гусеничных кранов состоит из рамы и двух гусеничных тележек.

4. Строительные экскаваторы переоборудуются в гусеничные краны путем применения сменного рабочего оборудования.

5. Считают, что пневмоколесные краны передвигаются намного быстрее, чем гусеничные краны.

6. Мы знаем, что без выносных опор грузоподъемность крана резко падает.

7. Известно, что выносные опоры увеличивают опорную базу крана.

8. Считают, что гусеничные краны могут работать без выносных опор.

XVIII. Learn the following dialogue.

Situation: You have just read a technical journal and come across an information about new self-powered jib cranes. You want to discuss it with your friend.

A. Hello! Haven`t seen you for ages! I have just read some information about new self-powered jib cranes.

B. Oh, it`s interesting. What have you learned about it?

A. They are employed for loading and unloading trucks, railway cars and ships.

B. And can they handle loose materials?

A. Yes, when coupled with a grab bucket, they can handle loose materials.

B. And what is their load-lifting capacity, I wonder?

A. As far as I remember it`s from 6.3 up to 160 tons.

B. Thank you for this interesting information

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