Permafrost

60
The experience of designing and construction of road water-carrying
metal goffered pipes on the icing places
V.G. Kondratiev, Dementiev A.D.
(JSC “CPE-Ecoterra”)
Abstract: Among set of scientific and technical problems of construction of highways in
cryolithozone the special place is occupied with a problem of a construction of their transitions
through temporary and small water-currents. Until recently it is usual on lots of permafrost and
icings the preference was given construction of small and average bridges. Even in that case
when icings were only assumed, it is frequent without a sufficient substantiation.
Water-carrying pipes were applied only on waterless valleys and is usual in traditional
performance: reinforced-concrete round in diameter 1,5 m from lengthy parts, one-, two-, three-
and four opening or rectangular with an aperture of 2,0 m х 2,0 m. The metal goffered pipes
were applied a little.
In 2003 the situation has cardinally changed, when became obvious, that universal
application of small and average bridges on temporary and small water-currents
Chita-Khabarovsk highway detains rates of construction of a federal highway and not always is
justified technically and economically.
So, absence appropriate geocryological to the information on lots of transitions of a
highway through water-currents with width of a channel 5 and 4 m on lots of a line of km 1008
and km 1020 have led to that originally, from fears of development icings, there were designed
four and three flying bridges in length of 97 and 55 m accordingly. The additional researches
executed by us have allowed to estimate real icing danger on water-currents and to develop
actions on its decrease that has allowed to apply on the specified water-currents more effective
technically and economically decisions with application of the goffered metal tubings of the big
diameter.
In total per 2003-2005 forces of Joint-Stock Company «CPE-Ecoterra» for a
Chita-Khabarovsk highway were designed 138 and 15 water-carrying constructions are
constructed of the metal goffered structures in the form of round pipes in diameter from 1,5 up
to 4,30 m and pipes-arches in width from 1,94 up to 10,72 m, by height from 1,6 up to 7,81 m
and equivalent diameter from 1,72 up to 7,5 m. Length of pipes thus, changed from 21 up to 70
m, a downgrade on a channel - from 0,0006 up to 0,05, thickness of a wall of a pipe - from 2,75
up to 7 mm. The height of embankment above pipes has made from 1,1 up to 16,09 m.
Water-currents had the charge from 1,07 up to 147 м 3 /sec.
In the report saved experience is analyzed and the to a focus is brought to problems of
designing and construction of water-carrying constructions from the metal goffered structures in
neighboring communes of distribution of a permafrost and deep seasonal freezing soils.
Key wods: Frame of Permanent Mai, designing and construction, water-carrying metal,
goffered pipes