-Constructability-Analysis-of-Monorail-Project.pdf

CIV. 1278 F: Pre-Project Planning & Constructability Analysis
Constructability Analysis of
Monorail Project
Submitted to Prof. EI-Diraby
Prepared by Bo Wang
Student No. 992551127
March 24th
, 2003

CIV 1278 Constructability Analysis of Monorail Project
Bo Wang 1 March 24, 2003
Abstract
Constructability is an important objective in the whole phases of a construction
project, and experts with knowledge and experience play an important role in
achieving superior constructability. Constructability analysis will help to eliminate
hidden costs and change orders, ensure schedule, improve construction quality
and enhance safety in construction project. This research is undertaken to
conduct a constructability analysis of monorail project. We identify
comprehensive factors which influence monorail project constructability during
project planning, design and field operation. Through literature review and case
study, a systematic approach and techniques to improve constructability in
monorail project will be developed. Finally, we further develop a practical
framework for constructability implementation in monorail project.

Table of Content
Abstract.................................................................................................................1
Table of Content ...................................................................................................2
1. Introduction .......................................................................................................3
2. Constructability .................................................................................................6
2.1 Definition of Constructability........................................................................6
2.2 Benefits of Constructability..........................................................................6
3. Monorail Projects ..............................................................................................7
3.1 Definition of Monorail...................................................................................7
3.2 Examples of Monorail System...................................................................10
3.3 Merits of Monorail......................................................................................11
4. Factors of Monorail Constructability................................................................13
5. Hierarchy of Techniques (HOT) in Implementation of Monorail Constructability
............................................................................................................................18
5.1 Constructability Concepts..........................................................................18
5.2 Hierarchy of Techniques (HOT).................................................................20
5.3 Case Studies.............................................................................................24
6. Constructability Implementation Progress.......................................................27
7. Conclusion ......................................................................................................31
Reference ...........................................................................................................32

1. Introduction
Constructability is a concept that has been pervasive for more than a decade in
the construction industry (CII, 1986). Its quantifiable benefits from implementation
have been well documented on many construction industry projects (CII, 1993).
This paper concentrates on analysis of monorail constructability. So far we do
find some literatures about constructability analysis of bridge (EI-Razek & Basha,
2001), highway (Anderson et al., 1999; Nima et al., 2002), industrial facility (CII,
1993) and office building (CII, 1993), but we haven’t seen any formal analysis of
monorail constructability. Lessons learned from monorail construction may have
their genesis in any phase of monorail project’s life cycle. Similarly, these lessons
may be applicable to one or more phases of project life cycle. The
constructability feedback model is shown in Figure1 (Kartam, 1996).
Figure1 Feedback of Constructability in Monorail Project Life Cycle
Due to the advantages of monorail in many transit realms, dozens of monorail
systems have been built and in operating. Other many monorail projects are also
in planning and under construction. There is a need to improve constructability of
Operation Phase
Planning Phase
Construction Phase
Post Occupancy
Evaluation
Constructability
Constructability
Design Phase Monorail Project
Development Process

monorail project by bridging gap between engineers and constructors in early
stage of monorail project. This paper addresses this issue through formalizing
the feedback system for construction knowledge. The following flowchart (Figure
2) describes the main research process of this paper.

Figure 2 Research Process of Constructability Analysis of Monorail Project
Background of Constructability
Introduction to Monorail Project
Constructability Analysis of Monorail Project
Influence Diagram HOT Diagram
Existing
Area
condition
Construction
Method
Project
Objectives
Project
Scope
Structural
System
Station
Design
Maintenances
Guideway
Design
Concepts
Techniques
Lessons learned
(Case Study)
Constructability Implementation Progress
Route
Planning
Storage
Computer
Control System
Power Supply
Car
Technology
Products
■ Literature Review
■ Case Study

2. Constructability
2.1 Definition of Constructability
The concept of constructability was introduced by CII (1986), in which it stated
“Constructability is the optimum use of construction knowledge and experience in
planning, design, procurement, and field operations to achieve overall project
objectives” (CII 1986). Constructability is also defined as a measure of the ease
of expediency with which a facility can be constructed (Hugo et al. 1990).
Constructability is an "attitude" that must prevail through conceptual planning,
design and procurement and field operations. If performed right, constructability
has been shown to reduce construction cost, by 10 to 20 times its
implementation cost (More 1983).
2.2 Benefits of Constructability
Constructability leads to some important benefits due to early integration of
construction knowledge and experience into the engineering and design of a
project. Constructability has demonstrated the potential to minimize the number
and magnitude of changes, disputes, cost overturns, and delays during
construction (CII 1986). Shortening construction time and improving project
management by using constructability is expected to decrease overall project
cost and thus reduce capital investment risk. The following are some direct
benefits from constructability:
- Construction planning is made easier
- Both design and construction costs can be reduced

- Likewise the construction schedule may be shortened
- Better quality can be required and expected
- More realistic commitments can be made to subsequent trades, and to
- Earlier owner occupation
Indirect benefits are more difficult to quantify, but nevertheless include:
- Building a collaborative team committed to project goals
- Parties working for mutual benefit
- Cross discipline training
- Transfer of expertise from other projects
- Constructors better understanding design intent, and vice versa
- Increased innovation in both design and construction
- Shorter learning curves
- Competitive advantage
3. Monorail Projects
3.1 Definition of Monorail
Monorail is a single rail serving as a track for passenger or freight vehicles. In
most cases rail is elevated, but monorails can also run at grade, below grade or
in subway tunnels. There are two basic monorail types: straddle and suspension
monorail. The straddle monorail runs on track beams which are mainly made of
steel. Suspension monorail is suspended under track beams which are made of
steel. Monorail vehicle are wider than the guideway that supports them. A
monorail system comprises guideway, car, station, power supply equipments,

computer control systems and maintenance and storage facilities. A detail
monorail system structure diagram is shown in Figure 3.

Figure 3 Structure of Monorail System
Monorail System
Station Guideway General Control system Vehicle Operations, Maintenance and Storage Facility (OMSF)
Emergency Evacuation
Automatic platform door
Closed circuit television
monitoring equipment
Stairs
Elevators
Aesthetics
Mechanical escalators
Location
Community System
Traction Power System
Fare Collection System
Power distribution System
Elevator status
Escalator status
Security intrusion alarm
Guideway switch status
SCADA System
Automatic Train
Supervision (ATS)
Automatic Train
Operation (ATP)
Automatic Train
Protection (ATP)
Automatic Train Control
Vehicle Shell
Vehicle interiors
Vehicle Maintenance
Control Rooms
Store Rooms
Administrative offices
Electrical and
Mechanical
Repair Shops
Beam
Crossbeam
Column
Foundation

3.2 Examples of Monorail System
Dozens of monorail systems have been in operation or under construction
around the world. Here several famous monorail systems will be introduced.
Figure 4 shows the pictures of these monorail systems respectively.
Figure 4 Wuppertal Monorail (top & left); Osaka Monorail (top & middle); Walt Disney World
Monorail (top & right); Seattle Monorail (bottom & left); Las Vegas Monorail (bottom & right)1
.
1) Wuppertal, Germany
Urban monorail systems have been in regular passenger service for more than
one hundred years, beginning with the Wuppertal suspended monorail system in
Wupperal, West Germany. This 8 mile-long monorail system began service in
1901 and remains in service today linking 20 stations.
2) Osaka, Japan
1
The Monorail Society, http://www.monorails.org/

The Osaka monorail emanates from the center of the city to connect surrounding
area with a half circle system which will eventually surround the city with over 50
km of track. The first 6.6 km segment opened in 1990 north of Osaka. In 1995,
the disastrous earthquake of nearby Kobe proved to be a test for the Osaka
Monorail. It withstood the violent quake and proved to be a vital transit link in the
area as traffic on the parallel freeway became completely jammed with evacuees.
3) Walt Disney World, Florida
Walt Disney world monorail began transit service in 1971. This 23.6 km long
monorail system with 6 stations carries 150,000 passengers every day.
4) Seattle, Washington
Seattle monorail was opened in 1962. This 1.9 km long monorail with two
stations carries 2.5 million passengers every year. In November of 1997, Seattle
voters passed the Monorail Initiative to extend the system citywide.
5) Las Vegas, Nevada
Las Vegas monorail was opened in 1995 which is short (1.2km) and only has two
stations, yet it carries more passengers (20,000/day) than some light rail systems
that are fifteen times longer with far more stations. This privately built and owned
monorail is a success story. Currently the system is being expanded the north to
connect with other resorts and he Convention Center.
3.3 Merits of Monorail
Compared with the subway (heavy rail) and trolley (light rail), the monorail shows
the following advantages (Aoki & Ishikawa, 1989):
1) Efficiency

Since the monorail vehicle uses a concrete or steel guidebeam for both the
vehicle’s running surface and structural support, less guideway maintenance is
required. The monorail guidebeam does not require periodic adjustment,
replacement, grinding, tightening, or other maintenance. The rubber tires get little
wear running on smooth guideways.
2) Cost
While capital costs can be as much as or more than light rail, monorail can turn a
profit once built. The Tokyo Monorail is operated by a private business and turns
a profit each year. This is unheard of with conventional rail or bus systems. The
Seattle Monorail also turns a profit each year.
3) Construction
Process of monorail construction is simple - dig a hole, drop in a pre-built support
pylon, truck in the track which was manufactured offsite, lift into place! Monorail
beamway can be installed far faster than the alternatives. Figure 5 shows a Las
Vegas Monorail beam being put into place. From truck bed to pylons was a
matter of a few minutes. The entire system took only seven months to construct.
No other fixed rail can be installed as quickly and as disruption-free.
Figure 5 Simple Construction Process of Monorail Figure 6 Environment-friendly Monorail
4) Aesthetics

The monorail guideway can be constructed to be an enhancement rather than a
detriment to the environment. Monorail systems generally have a smaller
footprint on the environment and the narrow guidebeams are less obtrusive than
conventional trough-type guideways that are really more like aerial road
structures. Figure 6 is the graceful arched guideway of the Walt Disney World
Monorail System. The beam is only 26" wide with the small shadow.
5) Safety
Monorails run on an exclusive grade-separated guideway. So there is no
possibility to collide with other vehicles. The ways by which monorails are
designed also make derailments virtually impossible. This is why monorails have
an excellent safety record.
4. Factors of Monorail Constructability
Monorail projects are often located in high density population area (such as
downtown) and famous scenic spots. Its strategic objectives could be diversity,
such as relieving traffic congestion, improving accessibility and visitor
convenience, working commuting and shopping, providing a good imagine of the
city for the visitors. Considering these characteristics of monorail, implementation
of constructability program in monorail project has to enhance safety, improve
efficiency, realize esthetics, reduce cost, ensure schedule and minimize impact
on environment.
A typical life cycle of monorail includes planning, design, construction and
operation and maintenance. Integration of lessons learned from construction into
all phases of the monorail is beneficial. Constructability analysis bridges the gap

between engineering and construction early in monorail project to achieve
possible full benefit. Constructability encompasses feedback loops emanating
from the construction phase. Constructability is an input of construction
knowledge and experience into all phases of a project. CII has shown that
integration of construction knowledge into all project phases has resulted in
paybacks of up to 15 to 1 (CII, 1993).
Figure 7 depicts the factors which should be considered in monorail
constructability analysis in the early phases of a project for obtaining optimum
project results. These factors coming from planning phase, design phase and
construction phased would influence monorail construction.

Figure 7 Influence Diagram of Monorail Constructability
Monorail Constructability
Structural System
Construction Method
Project Scope
Cost
Geographic Characteristics
R.O.W. Legal Constraints
Safety Contract Type Milestone
Project Objectives Project Management Plan
Guideway layout
Project Design Criteria Maintainability
Engineering
Construction
Operation
Operation
Site Information
Traffic volume Site Location
Existing Facility Land Cost
Weather Policy Constraints
Construction Access
and Feasibility
Guideway Structure Beam
Station Facility Maintenance Facility
Crossbeam
Columns
Foundation
Codes
Equipment
Management
Material
Management
Contruction
Sequence
Beam, Columns
and Foundation
Planning Phase
Design Phase
Construction Phase
Technology
Span
Clearance
Site Layout R.O.W. Accessibility
Specification

1) Factors from Planning Phase
Research indicates that the planning phase is where the maximum investment
returns are realized when constructability is considered in the whole project
development process (CII 1986). An analysis of the constructability knowledge in
the monorail planning indicates that the following planning factors are important
for constructability of monorail projects.
□ Project Objectives
Constructability of project objectives means if these objectives could be realized
in terms of construction, such as whether the budget is enough to construct the
monorail; whether the milestones is feasible in specific construction phase,
whether the contract types are suitable to ensure the successful completion of
the project.
□ Project Scope
The project scope provides series of specification and maintenance & operation
requirements for the construction of the monorail project. The specification and
requirements which in fact resulted from construction knowledge and experience
will instruct and influence the construction of monorail projects. Obviously, the
process is iterative.
□ Site Information
Site information such as traffic volume, soil, weather and existing facilities will
determine the feasibility and effects of the route planning, design and
construction of monorail projects. Different site information will lead to different
optimum construction for this specific project.

□ Technology
Different choice of technologies such as guideway structure (suspend or
straddle), vehicle structure and control system will influence the construction
methods. Better understanding different technologies, better implementing
constructability based on different project conditions.
2) Factors from Design Phase
The reality of construction is that probably 75% the problems encountered in the
field are generated in the design phase (Mendelsohn 1997). If we hope to reduce
problems in the field for monorail projects, an obvious place to be emphasized is
what we can do to catch these problems in the design phase.
□ Structural system
The structural system includes station facility, maintenance facility and guideway
structure. It is a core issue in the design and construction of monorail projects. It
will directly influence the efficiency, the whole cost, the schedule and the
aesthetics of this project.
□ Guideway layout
Guideway layout involves specific variables such as clearance, span, and legal
constraints. These different variables look like small issues, but they will
influence the final efficiency and cost of the project.
3) Factors from Construction Phase
Factors from construction phase also play an important role in influencing the
constructability of monorail projects. Barriers and problems encountered in the

construction could obviously stem from construction phase directly, except for the
planning and design phases.
□ Construction Method
The whole monorail project will benefit from the optimum management of
material and equipment, and innovative use of tools and equipment during field
operation, by reducing cost and improving efficiency.
□ Site Layout
The condition of construction site such as the accessibility influences the
choosing of the construction method and technologies. For example, the
accessibility for the large scale construction equipments should be considered.
5. Hierarchy of Techniques (HOT) in Implementation of Monorail
Constructability
5.1 Constructability Concepts
Construction industry institute (1993) formulated the 17 constructability concepts
in order to apply them in different phases in the project development process,
including the planning, design, and construction. The 17 constructability concepts
are listed below according to their relation to the different development phases.
Project constructability enhancement during the planning phase consists of
concepts from C-1 to C-8:
- Concept C-1: Constructability program is an integral part of project execution
plan.
- Concept C-2: Project planning involves construction knowledge and experience.

- Concept C-3: Early construction involvement in development of contracting
strategy.
- Concept C-4: Project schedules are construction-sensitive.
- Concept C-5: Basic design approaches consider major construction methods.
- Concept C-6: Site layout promotes efficient construction.
- Concept C-7: Project team participants responsible for constructability are
identified early.
- Concept C-8: Advanced information technologies are applied throughout project.
Project constructability enhancement during the design phase consists of
concept from C-9 to C-16:
Concept C-9: Design schedule are construction sensitive.
Concept C-10: Designed to enable efficient construction.
Concept C-11: Design elements are standardized.
Concept C-12: Specification are developed for construction.
Concept C-13: Designed for modularization and preassembly to facilitate
fabrication and transportation.
Concept C-14: Designed for accessibility of personnel, materials, and equipment.
Concept C-15: Designed for construction in adverse weather and remote
locations.
Concept C-16: Design and construction sequencing should facilitate system
turnover and start-up.
Project constructability enhancement during the construction phase comprises
one concept C-17:

Concept C-17: Contractor use of innovative construction methods.
5.2 Hierarchy of Techniques (HOT)
Based on the constructability concepts above, we establish the hierarchy of
techniques of constructability implementation for the whole monorail project
development process including planning, design and construction phases. Figure
8 shows the HOT diagram for monorail project in which some important concepts,
techniques and products featured in monorail construction are integrated.
Lessons learned are collected from dozens of monorail project around the world
being in operation or under construction, such as Seattle Monorail and Las
Vegas Monorail. In Figure 9, we further develop a HOT diagram specifically for
construction techniques.
Planning Phase
In the planning phase, some lessons learned from specific monorail projects,
such as Seattle Monorail, Kitakyushu Monorail and Chiba will give some useful
experiences on how to optimize station and route planning in planning phase,
which will guide the best practice in monorail project construction, especially in
promoting efficient construction.
Design Phase
Design is a complex and demanding process, but it is also the most fruitful area
in optimizing the whole project schedule. Modularization and preassembly in
design phase will simplify the construction process, ensure schedule and
minimize the impact on the environment. Standardization of design elements is
also desirable for any constructible design. Hence, to realize the constructability

in monorail projects, some codes are suggested to be followed in the monorail
design phase.
Construction Phase
Construction knowledge and experience are also needed to improve the
effectiveness of field operation. In the monorail construction phase, some
Innovative construction methods should be considered, such as subcontract,
construction techniques, and Innovations in materials, tools and equipment.
For example, the monorail project in Walt Disney World apply a new material —
composite material for carbody, which reduced the weight of the carbody and
increase the transportation capacity of the train. Additionally, Traffic management
should also be taken into account to minimize impact on existing traffic and
environment, and provide efficient accessibility.

Figure 8 HOT Diagrams for Monorail Project
Monorail Constructability
Project Design Project Construction
Project Planning
Innovations in Materials,
Tools and Equipment
Construction Techniques
Innovative Construction
Methods
Traffic Management
Optimize Route
Planning
Optimize Station
Planning
Design elements are
standardization
Designed for
modularization and
preassembly
Short and Direct
Convenience Access
Serve Maximal People
Connection with other
Public Transportation
Distance not exceed 1
km
Taking advantage of
existing facilities
LL1 Chiba, Japan
LL2 Kitakyushu, Japan
LL1 Walt Disney World
Accessibility
Minimizing impact on
Traffic and Environment
LL1 Las Vegas Monorail Precast Method
Subcontract
LL3 Seattle Monorail
U.C. 1991 Code
ACI 318
TDV Analysis Program
AASHTO 1992 Code

Figure 9 HOT Diagrams of Construction Technologies for Monorail Project
Maximizing efficiency of
Constructon
environment
Station Facility
Maintenance and
Storage Facility
Guideway
LL1 Wuppertal Monorail
LL 1 Las Vegas Monorail
LL 2 Monorail in Newark
International Airport
Construction
Technologies
Vehicle
Self-Evacuation
Fire Protection
FT Code
NFPA 130
FT Code
NFPA 130
LL 1 Walt Disney World Monorail
Steel Beam
for Large
Span
Thinner
Beams
Smaller and
Fewer
Columns
Large Capacity
End Door Side Door
Using Composite Material
LL 1 Walt Disney World Monorail
Better Design
Standard
Element
Precast Beams
Precast Columns
Maximizing Using
Existing Facility
Integrating with
adjacent building
Environment
LL 1 Seattle Monorail
LL
1
Las
Vegas
Monorail

5.3 Case Studies
(1) Precast Elements to Minimizing Impact on Surrounding Utilities
Las Vegas Monorail Project
This design was carried out in approximately six months by a team of engineers
from VSL Corporation in San Jose, California. Several different alignments for
the guideway structure were considered to minimize impacts on the operation of
the hotel, and to minimize the impact on surrounding utilities, while optimizing the
structural layout of the guideway.
To accelerate construction and minimize the impact to the surrounding areas, it
was decided that most of the structural components would be precast elements
to facilitate the erection and provide the tight tolerances required fro the
guideway beams. As a result of this decision, all guideway beams, guideway
columns, and station beams were precast. The cast-in-place elements were the
foundations, caissons, caissons caps, station main columns, and the
maintenance facility (Stone 1998).
(2) Guideway Structure
Kitakyushu Monorail Project
Considering the monorail project is located in the central part of the city,
engineers used steel beams to minimize the number of pylons so as to not to
impair the city appearance. In rainy weather, steel beams tend to cause the
rubber tires to slip as their cohesion to the running surfaces of the beams decline.
In view of this, steel beams used in section with a gradient of 3% or more were

provided with a grooved upper flange to increase the friction resistance of the
upper surface. In this way, the operation safety of the monorail project was
ensured (Aoki and Ishikawa, 1989).
Okinawa Monorail Project
In the decision of the guideway structure, experts considered the natural
environment in Okinawa and the approach of procurement in this project. For
Okinawa is surrounded by water, salty water from ocean damages steel. When
they adopt suspension type, they have to import steel from Japan Mainland
because Okinawa doesn’t have steel manufacturing industries. When they adopt
straddle type, local companies can produce concrete and assemble pylons
because Okinawa has concrete manufacturing industries. In Okinawa,
Suspension type made of steel is more expensive than straddle type. Therefore,
the straddle type was adopted in this project. The result has showed that
constructability analysis in this project not increased the endurance of the
structure, but also saved the transportation cost of the material in the
construction phase (Kina and Kuroshima, 1998).
(3) Integrating station and guideway with adjacent facilities
Seattle Monorail Project
The Seattle Planning Commission and Seattle Design Commission are
committed to providing constructive advice regarding the planning and design
aspects in Seattle Monorail Project. Stations design was suggested as follows.

First, stations should be integrated into adjacent existing facilities to the fullest
extent possible, in order to reduce the visual and functional impacts of the large
station areas on public streets. At the same time, this method will reduce the cost
of stations construction, take advantage of some temporary facilities and speed
the construction schedule. Also, the choice of the stations location should
consider the connections with other transportation facilities, compatibility with
existing roads, future development project, conformity to structural standards etc
(SPC 2002).
(4) Construction Activities and Contract Type
Las Vegas Monorail Project
A construction team started to operate in Las Vegas almost at the same time
design started. This team coordinated construction activities with the owner,
provided the design team with survey information, and worked with local utilities
to ensure a timely relocation of those utilities impacted by the monorail layout.
The coordination between different participants was critical to the successful
commissioning of the monorail (Stone, 1998).
The Las Vegas monorail is using a relatively new approach to building
transportation project. A private group of companies is designing and building the
project for a fixed price. If the project exceeds its budget, the contractors are
liable for additional costs. If the project does not open on schedule, the
contractors pay a substantial penalty. In addition, the companies that build the
system will operate and maintain it for 15 years with a 99% performance

guarantee. This ensures that the people who build it have a strong financial
incentive to build it right and for the long-term. This approach is called Design,
Build, Operation and Maintain ------ or DBOM, which provides incentives for the
life cycle cost efficiency in design and construction, and stimulate the DBOM
team build a high-quality system (Weeks 2002).
6. Constructability Implementation Progress
A constructability program is the application or process of a systematic
optimization of the construction-related aspects of a project during the planning,
design, procurement, construction, test, and start-up phases by knowledgeable,
experienced construction personnel to ensure that the projects are buildable,
cost effective, biddable, and maintainable. A corporate and project level
constructability implementation program has already been developed by the
Construction Industry Institute (CII 1993) (See figure 10). After identifying
constructability issues related to the monorail project, in this section, a framework
will be developed to improve monorail constructability implementation based on
the roadmap in Figure 10. The focus of the developed framework is incorporating
construction knowledge, and experience, as early as possible within the project
life cycle and capturing that knowledge to pass onto future projects.
Constructability analysis has been implemented in some monorail projects. For
example, in Las Vegas Monorail Project, a construction team started operation in
Las Vegas almost at the same time design started. This team coordinated
construction activities with the Owner, provided the design team with surveying

information, secured building permits, and worked with local utilities to ensure a
timely relocation of those utilities impacted by the monorail layout.
However, a systematic and complete constructability analysis hasn’t been seen
in literature review. From the basic 17 implementation concepts listed in the
above and many construction practices of existing monorail projects, we develop
the guidelines for monorail project constructability program based on the road
map (Figure 10):
1) Monorail Constructability must be addressed at the outset of a project
The project strategy should clearly state the intention to implement a
constructability program. Commitment to this strategy by the project team should
be enlisted through positive leadership, clear goal setting, effective procedure
development, training and support. Key constructability activities events, such as
route planning, guideway structure design and traffic management, should be
identified and planned into the project program, with a construction manager
being appointed early in the project development phase to work with the project
definition and design teams to ensure constructability is fully addressed. Reviews
should be undertaken early during each key project phase as pro-active events
seeking to 'design in' positive ideas, and not as reactive responses attempting to
'design out' weaknesses. It is important to recognize that as with all value
management activities, the potential for achieving improved constructability

results is highest at the outset of a project and reduce as the project progresses
toward the construction phase.
2) Constructability reviews should involve all relevant participants
Including personnel from planning, design, procurement, construction,
commissioning, operations, vendors, and contractors, plus specialist information
and service providers, all relevant participants should be included. Construction
contractors selected for the project should be assessed on their strengths and
weaknesses, their capabilities and competence levels. Contractor strengths
should be integrated into design, procurement and construction plans, while
awareness of and appropriate allowance for weaknesses should be made. This
is only possible if construction contractors are identified and appointed at an
early stage of the project. Contractors should be encouraged to participate in the
constructability program and contribute to constructability reviews, studies, ideas
and initiatives. This will maximize the benefits of contractor expertise, ensure
ideas and initiatives are practical, and obtain contractor ownership and
commitment within the project team.

Figure 10 Constructability Implementation Roadmap for Monorail Project
Understand
constructability
Objectives,
methods,
concepts, and
barriers
Perform self-
assessment and
barriers
Assess and
recognize
constructability
benefits
Develop
implementation
policy
Apply
constructability
concepts and
procedures
Monitor and
evaluate project
program
effectiveness
Document LL
Evaluate
corporate
program
effectiveness
Modify
organization and
procedures;
update LL
databases
Identify
constructability
Establish
functional
support
organization and
procedures
Develop LL file
Assemble key
owner team
members
Define
constructability
objectives and
measures
Select project
contracting
strategy
Secure
contractors,
vendors, and
consultants
Develop
constructability
team
Identify and
address project
barriers
Consult
application
matrix and LL
file
Develop
constructability
procedures and
integrate it into
project activities
Commit to
implementing
constructability
Establish
corporate
constructability
program
Plan
constructability
implementation
Implement
constructability
Update
corporate
program
Obtain
constructability
capabilities
Corporate Program
Project Program

3) Best practice, lessons learned and construction knowledge and experience
should be recorded
Best practice, lessons learned, and construction knowledge and experience from
previous project constructability initiatives, should be used to optimize the
planning, design and construction of the current project. New ideas and
innovation should be encouraged, controlled, recorded and assessed in the
context of continuous improvement. Specific constructability studies, identified by
the project and constructability teams, should be conducted, with the results
subsequently assessed for overall project benefit. All relevant constructability
ideas generated throughout the project should be recorded and assessed for
their contribution to the project. A structured listing of ideas should be developed
and reviewed for impact on the project. Ideas found to be of overall project
benefit should be acted as constructability initiatives and implemented at the
appropriate project phase.
7. Conclusion
Constructability analysis is needed for monorail construction to improve efficiency,
enhance safety and reducing cost. A formal constructability program is very
beneficial. However, there is not a formal constructability program has been
implemented in existing monorail. More research is needed to identify issues and
problems in monorail construction. Integration of construction knowledge into
planning, design and construction phase as early as possible could optimize the
overall project.

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