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3 What is the function of pile foundations?

Pile foundations are widely used in such cases.They cut through the thickness of the ground and rest upon firm layers. The piles were almost always of timber.Once hammerd into the ground, they acted as columns usually transmitting part of the load to firmer ground at the foot. Ferro- concrete was discovered about 200 years ago. Wooden piles gradually became a thing of the past. They have been replaced by ferro- concrete and metal piles.

4 Can piles be made without using building materials?

The new requirements for tall buildings were mainly met by the substitution of grillages of steel beams for the less efficient, earlier spread footing. These have since given way to footings and piles of reinforced concrete. The heaviest reinforced-concrete piles are nowadays cast in situ in prebored hole.

A group of specialists has developed piles without using building material for the purpose. At the depth of 16-18m a hole is drilled. A special burner is then inserted. At 1,400° C the earth fuses. It then hardens and becomes a bearing pillar.

Notes to the text

stratum (мн.ч. – strata)- пласт

pile - свая

pier - столб

grillage - решётка; ростверк

in situ - на месте

4.6 Read the dialogue in pairs

A.: There's something I want to ask you. May I ?

B.: Sure , you may! Why not?

A.: What do we call that par of a building on which the walls rest?

B.: Do you mean to say that you don't know?

We call in the foundation.

A.: What is the function of foundation?

B.: The durability of a structure depends on it?

A.: Oh, I see. And what is a purpose of a column, for example?

B.: A column either supports or decorates part of a building.

A.: Can a column stand as a monument?

B.: Of course, it can.

4.6.1 Complete the dialogues

  1. A.: What do we call … ?

B.: … … …

A.: Where is … used ?

B.: … … …

2. A.: … … …

B.: Do you mean to say that you don't know?

A.: What is the function of … ?

B.: … … …

4.6.2 Think of your own dialogues

4.7 Summarize your knowledge of the question under consideration

4.7.1 Find in the texts and put down key words that can be used to speak about the structural elements

4.7.2 Make up a written story or an oral report about the different

structural elements

5. Unit 5 Building Materials

Warming – up

1.What building materials do you know?

2.Can you give examples of natural and artificial building materials?

5.1 Pretext exercises

5.1.1Read the words. Pay attention to the letters in italics

[ð] that, this, these, they, together, with, weather, there, them

[ө] strength, thousand, three, nineteenth

[∫] should, shall, finish

[t∫] choice, such, cheap, which

[ŋ] building, strength, finishing, decorating, binding, bearing, strong

[g] give, together, good, ago, began, conglomerate, glass, organic, group

[d3] engineer, range, disadvantage, Egyptians, large, general, gypsum

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