A statistical study of construction productivity from 1917 to 1957. - Page 62 |
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52
and shovel. Backfill was by hand in some cases and a small
tractor was used in others. Backfill under the slab continued
to be done by hand and at a much reduced output.
191^7"1957« By 1950 mechanization was complete for
all excavation down to the smallest job. Even individual'
house footings are now dug with rubber tire mounted
ditching machines. A trenching machine was used for all
excavation in this period with only the smallest amount of
hand trimming. The backfill was done with skip loader, and
backfill under the slab was done by a skip loader with
buc ke t .
Concrete Work by Machine
The rate of productivity increase for mixing and
placing concrete, as illustrated by Curve 2 on Figure 6 ,
page 50, is second only to that of excavation. Both operations
are common to every construction project; hence, this
productivity increase accounts for a large part of the total
improvement. The problem consists of mixing and pouring a
total of approximately 272 cubic yards.
1917-1937• Concrete mixing was an "onsite” operation
throughout this period. Progressively better and
larger mixers were used commencing with the "one bag" mixer
in 1917 and increasing to 1 / 2 cubic yard and larger mixers
in later years. Regardless of the mixer size, however,
Object Description
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| Title | A statistical study of construction productivity from 1917 to 1957. - Page 62 |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 52 and shovel. Backfill was by hand in some cases and a small tractor was used in others. Backfill under the slab continued to be done by hand and at a much reduced output. 191^7"1957« By 1950 mechanization was complete for all excavation down to the smallest job. Even individual' house footings are now dug with rubber tire mounted ditching machines. A trenching machine was used for all excavation in this period with only the smallest amount of hand trimming. The backfill was done with skip loader, and backfill under the slab was done by a skip loader with buc ke t . Concrete Work by Machine The rate of productivity increase for mixing and placing concrete, as illustrated by Curve 2 on Figure 6 , page 50, is second only to that of excavation. Both operations are common to every construction project; hence, this productivity increase accounts for a large part of the total improvement. The problem consists of mixing and pouring a total of approximately 272 cubic yards. 1917-1937• Concrete mixing was an "onsite” operation throughout this period. Progressively better and larger mixers were used commencing with the "one bag" mixer in 1917 and increasing to 1 / 2 cubic yard and larger mixers in later years. Regardless of the mixer size, however, |
