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Science Forum Index » Geology Forum » Development top-down method of underground construction or H
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| Victor Yurkevich |
 Posted: Thu Nov 20, 2003 12:48 am |
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Guest
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Development top-down method of underground construction or Hi-Tech in
Russian.
http://www.yurkevich.ru/doc/hi-tech.pdf
It is for the first time in Russia that on the basis of our «know-how»
related to erection of multilevel underground parking-garage by
top-down method, both lift shafts/staircases and access ramps with
their serpentine parts were erected downwards simultaneously with the
floor-slabs. This innovation made it possible to use the ramp
structure at all project construction stages both as permanent support
system and for delivery of materials and small articles thereupon as
well as to start finishing work and installation of engineering
systems at the erected upper stores simultaneously with the soil
excavation and with erection of the lower stores.
Clients and investors have repeatedly shown their interest to reduce
the amount of their investment by finding ways for buildings to be put
into operation with unfinished underground stores, the stores being
finished on account of profit gained from operation of the building.
Indeed, it may be reasonable under certain circumstances to put a
building into operation with finished aboveground structures and
limited number of finished underground stores minimally needed for the
first period of operation, so that the whole project could be
completed without barring operation of these stores. This is
particularly vital for underground parking-garages, storage premices
and garages. This is no secret that in densely built-up urban areas,
the cost of underground construction projects essentially exceeds that
of those aboveground; however, owing to rise of the cost of land and
to the overall urbanization, underground construction gets more and
more demanded.
The top-down method in civil construction have made such an obvious
progress that the second-turn construction of underground stores does
not seem to be fantastic so far. On demand of the client, we are at
present ready to give our proposals for any future project.
Under market economy, a demand is always answered with a proposal.
Given the fact that the baret system of erecting support structures so
traditional for western countries has from the very beginning been
orientated exclusively to the classic top-down construction method,
there is no wonder that the demand for our technology which allows to
simultaneously proceed with the construction both upwards and
downwards from the ground level raised so much.
Owing to an essential cut in the overall project construction time,
the use of bored columns characteristic with high rigidity and
carrying capacity gained very soon after the erection brings the
top-down method of underground construction to a new quality level. It
is at least unethical to compare the cut-and-cover and the top-down
method on the basis of the cost of the project underground part only
and on the basis of the classic «top-down» scheme.
Under particularly adverse site geological conditions and in densely
built-up urban areas, the most safe and at the same time combined
top-down method does not practically have any competition, since in
case of the cut-and-cover techniques, direct construction cost of the
underground part of the new building should be added with costs
associated with the consolidation of foundations and structures of
neighboring protected buildings. |
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