In the construction process, the
underground construction package takes a big ratio of project cost. Underground
construction package faces a lot of invisible factors which can affect the
project cost a lot such as underground water level, existing neighbor projects,
soil conditions, underground obstructions, etc. Furthermore, deep excavation of
underground construction is also very important. The unreasonable method can
affect the project cost such as: method of excavation, soil disposal, shoring
system etc.
In recent years, the urbanization
in Vietnam develops so fast, which leads to the requirement of basements for
almost high-rise buildings as well as for underground parking, subways, tunnels,
etc.
In fact, there are no solutions
appropriate enough for underground construction. Moreover, it must be
recognizable that excavation methods are applied differently in various
locations. Some of the construction technologies can depend on the
characteristics as follows:
- Geotechnical
conditions
- Relief
conditions
- Available
equipment
- Construction
and design experience
- Neighborhood
construction
- Drainage
conditions
- Waterproof
methods and methods of reducing water flow
- Impacts
on underground water level
- Load
- Environment
- Expenditures
- Duration
- Risks
Design
consultancy and project management play an important role in the success of the
project. Construction consultants are responsible for designing and selecting experienced
contractors, controlling risks which may badly affect investors and the
community.
Mr. Bien
Nam Hai made a case study aimed to:
1. study cost estimation in a
construction project in Vietnam as a case study.
2. study cost risks and
escalation.
3. discuss strengths and weakness
of the cost estimation, control and risk management of the case study.
Conclusion
Methods of basement design and methods of basement construction have a close
connection, for the design characteristics of the basement protection structure
depend on the construction technologies. The basement protection structure is
also the one to stand the permanent force. Therefore, the overall construction
methods start from basement design. Currently, the construction technologies
are so diversified that the design and construction company has to analyze and
present the design and construction methods most appropriate to the available
conditions.
Economically, the basement
construction is the one that may make a big loss without appropriate design and
construction methods.
Technologically, the basement
construction is complicated because of being performed in such a depth that the
construction itself and the associated construction are likely to have
problems. Therefore, design, construction and supervision must be paid much
attention to.
Recommendations
The arising problems of the basement and underground construction have been
the first concerns in Vietnam, especially to construction engineers, owners and
managers. Therefore, knowledge enhancement, experience accumulation, technology
exchange, human resource and professional improvement play a crucial role.
There must be well-qualified human resources first and then well-qualified
basements come. High values, low prices and enhanced quality.
The conditions of geography, hydrography, nature and climate in Vietnam are
complicated and diversified as well as a lot of weak ground. Vietnam is among
the five countries to be greatly affected by the climate changes. Thus, careful
study of design, construction, monitoring, management, exploitation and
maintenance of the basement construction must be performed professionally and
with good career morality. Only professional engineers are able to take charge
of signing the drawings, managing, leading and performing the basement
construction. Foreign consultancy is also important, but Vietnam must have
strategies to develop the human resource for the basement development
technology.
Obviously, without achieving such vital requirements, there must be big
losses of labor and property from the state and owners. Also, it costs a lot to
repair the mistakes of the basement design and construction.
Abstract
This study, which refers to the
theories and the standards system, has expressed the concept of cost
estimation, cost control, cost risks and escalation of underground construction
package of high-rise building
The next part of this report is
the case study of Commercial Center, Textile Fabrics, Department Store and Apartment project,
study cost estimation and cost escalation of the basement of high-rise
building. This is also the objective of this study.