Building mechanisms

There are many types of building mechanisms, but the most important

i are mixers, earth-moving machmery, and tower cranes. Mixers are the

' most important items of the concrete products industries. Usually both

batch and continuous mixers are used. A_r given charge of materials is

placed in the batch mixer, mixed and discharged before the next material

is added. Batch mixers are manufactured in a wide range of sizes and

with various combinations of mechanical features. In continuous mixers,

the proportioned materials are introduced in intervals.

It is not impossible to start on a construction job without a good deal of

w*preliminary leveling the site. To carry out this work must employ the

earth moving machinery. Site preparation and excavation are the most

fully mechanized of all the operations in building construction. Most

excavating machinery is slow moving and heavy and must be carried

from site to site on special transporters.

Tower cranes are considered to be a comparatively recent innovation and have already proved their worth. They consist of vertical mast--"⁰?** «t structure mounted on a wheeled chassis. The wheeled chassis is self­-propelled on railway track, o"-^ - х*-*е*

Almost everybody saw the construction of a building and followed its progress with interest. First the excavation is dig for the basement, and then the foundation walls below ground level are constructed; after this framework is erected and clothed with various finishing materials and protected by several coats of paint.

II. Give translation of the following words and phrases:

Mixer (n), earth-moving machinery, tower crane (n), concrete products industry, batch and continuous mixers, to mix and discharge (v), to manufacture (v), mechanical feature, proportioned materials are introduced in intervals, construction job, preliminary leveling the site, to carry out (v), site preparation and excavation, excavating machinery, vertical mast structure mounted on a wheeled chassis, self-propelled (adj), railway track.