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By
Dr. Heng Li [bshengli@polyu.edu.hk] Tel: 2766 5879
1.
Learning Objectives
"AN
ANALYSIS OF A BUILDING IN TERMS OF THE PROCESS REQUIRED AND THE
BUILDING TEAM WHICH IMPLEMENT THEM."
2.
Activities
- Erection of a building
is a complex process
- Activities involve:-
-
Initial decision
to build
-
Securing of
financial resources
-
Selection of
appropriate location
-
Appointment
and briefing of suitable member to be involved with design
and construction operations
-
Definition
of precise functional requirements
-
Design process
and decision functional requirements
-
Design process
and decision on how to build
-
Implementation
of erection
-
Operations
necessary to maintain building in the state of continuous
performance for which it was intended
-
Operations
necessary to adapt building to new functions
-
All these activities
may be affected by approvals, controls, checks and cross checks
which involve the entire building team and outside bodies
in varying administrative, technical, financial and fiscal
capacities
-
The creation of
a building was formerly a leisurely occupation ultimately
dependent upon craft-based skills in the past, the whole process
is now greatly influenced by the desire to achieve profit
on financial investments as soon as possible and the exploitation
of machine technology
-
Although most buildings
of today are far more complex and sometimes much larger, the
time scale to build is far shorter
3.
Plan of Work
The Plan of Work
has subsequently become widely known among other professions
concerned with the design and construction of buildings as is
if capable of being used in a variety of ways.
It can assist the
planning of projects and be adapted to form the basis for control
of organizational procedures.
Works are grouped
into 12 stages:-
Inception
Stage
Feasibility
Stage
Outline
Proposals
Scheme
Design
Production
Information
Bills
of Quantities
Tender
Action
Project
Planning
Operations
on Site
Completion
Feedback
Building processes
include:-
Planning
the work and setting timetables
Carrying
out work
Making
proposals
Making
decisions
Setting
out objectives for next stages
4.
The Building Team
Building is a group
activity and its success depends on a good understanding and operation
between a large number of people.
The participants involved
can be conveniently arranged into groups or teams according to
their particular interest and /or involvement as follows:-
4.1
Client Team
The
client or the building owner has the responsibility for defining
the building to suit needs, establishing and providing the necessary
finances, agreeing design and construction phases, timetabling,
and, of course, fulfilling the management and running of the completed
project.
A potential
client must establish whether to build or not to build. Having
decided that a new building is necessary to provide additional
or alternative space, it is important that consideration is then
given to when the space will be needed. Various problems are needed
to be solved, such as: land acquisition, establishment of rights,
development permits, planning permission, building approval, contractor
selection and subsequent erection.
Most
building is undertaken from money made available in the form of
a loan – therefore, interest rates are important. In this respect,
the government has direct influence and can use the building industry
as a regulator for the economy of the country.
Once
the money becomes available for a building, the client will require
speedy action for its design, construction and subsequent use
so that the lost interest, which would have been gained through
alternative financial investments, may be speedily recouped. The
total cost of a building must include the professional fees of
the Design Team which the client appoints.
4.2
User Team
User
Team forms a vital link between design concepts and built reality.
An example of User Team is the advisory organization formed by
the tenants of public housing.
4.3
Design Team
There are a great many
people in a Design Team who concerned with supplying the design
expertise which will make a building possible.
Principal Designers
generally include architects, interior designers, and
building surveyors. They are responsible for the overall design
of the project.
-
Architects design
and prepare the production information for most building projects.
They will also inspect the construction work on site.
-
Interior Designers
can also prepare design and production information for a building,
and provide supervision of work, but, they may be specifically
concerned with the interior of a building and need additional
advisers in order to deal with all the design and construction
processes involved in total building.
-
Building Surveyors
are sometimes responsible for the design and supervision of
certain building work although they are more usually carry
out surveys of structural soundness, condition of dilapidation
or repair, alterations/extensions to existing buildings and
market value of existing buildings.
Specialist
Designers include civil and structural engineers, services
engineers, and those concerned with specific aspects of architecture,
including landscape, interiors, office planning, etc. They provide
expertise concerning certain aspects of a building and whose requirements
are often coordinated by the Principal Designer. For example:
HVAC
Communications
Drainage
and plumbing
Electrical
Fire
services
Security
systems
- Civil and Structural
Engineers are employed to assist Principal Designers on building
projects which contain appreciable quantities of structural
work, such as reinforced concrete, complex steel or timber
work, or foundations which are either complex or abnormal.
- Services Engineers
work with other designers and are concerned with environmental
control – lighting, heating, air conditioning, and sound modulation;
electrical installations, plumbing and waste-disposal systems;
and mechanical services, such as lift installations and electrical
conductors.
Quantity
Surveyors provide the cost control and financial advice
to client, principal designers and specialist designers. They
are responsible for preparing Bills of Quantities. Also, during
the actual construction period for a project, he must measure
and value the work carried out at regular (monthly) intervals
and submit details to the overall financial administrator (usually
the principal designer) for payments from client to contractor.
They also advises on the use of sums of money listed in the Bill
of Quantities for contingency or provisional items, the cost of
making variations in areas originally described in the Bills or
indicated on the drawings, and settlement of the final account
for the finished project.
Depending on the precise
nature of a project, the combined cost of these professional fees
will vary from between 12% and 20% of the final construction costs.
4.3
Research Team
Researchers
are those making understanding and development of current construction
methods (materials and technical ability). The aim of the research
is to discover facts by means of scientific study and, in matters
concerning building, covers a very wide area of knowledge requiring
controlled programming of critical investigation of chosen subjects.
4.4
Legislative Team
They negotiate with
the relevant authorities to clarify certain legal requirements.
Building Ordinance Office, Planning Department, Fire Services
Department, Highways Department, Urban Council, etc.
On
site management level, a builder has to ensure that the building
site maintains safe and healthy conditions for employees, and
that the general public should be adequately protected from dangers
resulting from site operations.
In
UK, a new regulation, the Construction (Design and Management)
Regulations was implemented in 1995 which share the health and
safety liabilities among all parties concerned.
4.5
Manufacturing Team
This team supplies
the materials, components and equipment which are used during
the construction processes of a building, and, therefore, incorporate
many organizations and interests. With the need to economize in
labour and reduce costs, building procedures became more rationalized
and mechanized.
However, the continual
advancement of technology, and increases in complexity and size
of buildings today results in even more complex construction processes.
Manufacturers must extend their services from the supply of single
components, to the supply of much larger parts of a building (elements)
and indeed whole buildings. Site operations are reduced to a minimum
using mechanical plant, and methods of building become largely
concerned with the organization of the systematic supply and assembly
of pre-fabricated items, i.e. System Building.
Closed
System Building: some produced items which will not normally
fit with the components of other manufacturers.
Open
System Building: when component design is coordinated between
the manufacturers of different products so that they can be
used together without alterations or become interchangeable.
4.6
Construction Team
The erection of a building
depends on an industry where total reliance is placed on the diverse
attitudes, abilities, and adaptability of its workers.
Today, most specialist
trades are employed as nominated sub-contractors
by the client or principal designer on behalf of the client; a
relatively few day tradesmen being employed directly by the main
contractor as domestic sub-contractors.
The main contractor
is responsible for managing and directing al works on a site,
and coordinating the work of each trade. The nominated and domestic
sub-contractors are responsible for managing and coordinating
their individual works. They are required to design and provide
specialist elements within a building from a statement of performance
requirements, but the main contractor is still entirely responsible
for the satisfactory completion of the work involved.
The client or the principal
designer would employ nominated suppliers for certain
specialist materials, components or equipment which are to be used
or fixed into position by the main contractor.
Asphalter -
roof, floor and wall (basement) finishes
Bricklayer -
laying brickwork
Carpenter -
structural and carcassing timber work
Concretor -
placing concrete
Drainlayer -
providing below ground drainage
Electrician -
electrical installation
Excavation -
levelling site and digging drain/foundation trenches
Floor tiler -
internal floor finishes
Gas-fitter -
gas installation
Glazier -
fixing glass
Joiner -
timber work to finished components
Metal worker -
sheet metal applications (roofing)
Painter and decorator -
finishing components
Paver -
external paths/roads finishes
Plasterer -
plastering walls/ceilings, screeding and rendering
Plumber -
plumbing installation, flashing and gas pipes (interior)
Scaffolder -
erecting scaffolding and working platforms
Steel erector -
erecting steel columns and beams
Steel fixer -
cutting, shaping and positioning steel reinforcement
Tiler and slater -
roof finishes
Basic list of trades
which would be employed for erection of a simple building
Types of Building
Organizations
Main contractors can
be divided into three basic groups:
General
Builders
General
Contractors
Design
and Construction Companies
Package
Deal Contractors
4.7
Maintenance Team
The chosen design and
construction method of a building must take into account the effects
which time will have on their performance. The precise methods
adopted for subsequent maintenance and cleaning will also be influenced
by the attitude of the Client Team towards the running costs of
a building.
On completion of a
project, the Client Team must be presented with a Maintenance
Manual complied by the Design Team which incorporates the advice
of the consultative Maintenance Team.
Maintenance Manual
describes how a building can be expected to perform, what measures
have been taken to ensure it does, and what action must be taken
in the future.
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