The highest temperature in Golmud during the daytime is around
minus 10 degrees centigrade. Construction of the world's highest
railway, however, has not been "frozen".
Workers are driving trucks and shuttling back and forth on
designated makeshift roads. Preheated water and sand are used in
concrete mixers clouded in white steam.
Several hoardings displaying green grass and blue skies stand out
in the dull winter. The hoardings remind workers to be
environmentally friendly, saying "Taking good care of the plateau
prairie", "Cherishing the plateau eco-system by building a 'green'
railway", and "Wild plateau animals are our friends".
Unlike in summer, each worker is now carrying an oxygen bag on the
back. Extra oxygen cylinders are also kept in the entrance
ways.
"People are more likely to suffer from anoxia in winter as grass
withers and tree leaves fall," said Zhang Xiuli, engineer for the
headquarters of the Qinghai-
Tibet Railway construction.
The altitude of the section now being constructed is between 4,000
to 5,000 meters. Doctors keep moving around the site to see if
anyone needs help.
"To date no one has had a health problem caused by anoxia," Zhang
said.
He
said that most construction work has been suspended due to the
winter weather. However tunnel digging and bridge building, which
decide the pace for track laying, will be continued throughout the
winter.
Other projects continued throughout winter are those the
commencement of which is an essential to the overall construction
timetable, he added.
More than 8,000 workers are expected to participate in winter
construction work. Work in the wild is restricted to no more than
six hours a day or in a tunnel no more than four hours, according
to new rules issued by the headquarters.
Nutritionists work out menus to guarantee that every person
receives enough nutrition and calories. Fresh meat, vegetables and
fruits are transported everyday from Golmud to the construction
sites which are scattered over 100 km of the Qinghai-Tibet road,
which lies parallel to the railway under construction.
As
many machines as possible are used to reduce the intensity of the
work. "The intensity of the work is below the medium expected,"
says the engineer.
Construction work is well under way, he explained from the latest
construction schedule.
Zhang said that headquarters have adopted construction and health
care plans which adapt to the special climate on the Plateau, to
ensure workers' health and the quality of construction work.
The mixture in the concrete mixer must be heated and its
temperature should be 10 to 20 degrees centigrade. Containers are
wrapped with cotton blankets to keep the mixer warm. Tubes piping
concrete to the construction site are made of thermal insulation
materials. Steam is blown onto newly poured concrete bases to avoid
glaciation before solidification.
"Such measures are efficient and make bridge bases as firm as those
built in other warmer seasons," Zhang said, "by doing this we are
able to meet the strict standards set for quality
examinations."
Construction of the 1,118-km Qinghai-Tibet Railway began on June 29
this year. More than 960 km, or over 80 percent of the railway will
be built at an altitude of more than 4,000 meters. It will be the
longest and most elevated railway to be built on any highland in
the world.
(
December 31, 2001)