CRAIG DUBLER Construction Management Option Steven F. Udvar-Hazy Center, Chantilly, VA November 12, 2003 Technical Assignment #3 PROJECT DELIVERY EVALUATION TABLE OF CONTENTS EXECUTIVE SUMMARY …………………………………………………………………………….. 2 SITE LAYOUT PLANNING ………………………………………………………………………….. 3-5 TEMPORARY UTILITIES ……………………………………………………………………………. 6-7 DETAILED STRUCTURAL SYSTEMS ESTIMATE …………………………………………………. 8-12 GENERAL CONDITIONS ESTIMATE ………………………………………………………………. 13-15 PROJECT SCHEDULE ……………………………………………………………………………….. 16 PROJECT CASH FLOW …………………………………………………………………………….. 17
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Technical Assignment #3 PROJECT DELIVERY …...CRAIG DUBLER Construction Management Option Steven F. Udvar-Hazy Center, Chantilly, VA November 12, 2003 Technical Assignment #3 PROJECT
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CRAIG DUBLER Construction Management Option Steven F. Udvar-Hazy Center, Chantilly, VA November 12, 2003
During this technical assignment, I developed a better understanding of the
building systems and related construction costs. This development was achieved through the research of several different categories which include: Site Layout Planning, Temporary Utilities, Detailed Structural Systems Estimate, General Conditions Estimate, Project Schedule, and Cash Flow. Site Layout Planning Site plans for excavation, superstructure and finish phases of the project are included in this section. A list of description explaining the key features of the site layout follows. Temporary Utilities Requirements of supporting installment for two materials from the project are explained in detail. The requirements can be applied to the people working on the site and to the structure. Detailed Structural Estimate A detailed structural estimate is prepared. This includes the foundation system, the quantity of concrete, quantity of steel for columns and beams, roof, equipment cost and others. Spreadsheets with quantity showing and estimate from MC^2 are attached. General Conditions Estimate In this section, a General Conditions estimate is developed in MC^2 from the Staffing plan that previous assignment had put together. This includes general costs that the general contractor will occur during the project. Project Schedule A primavera schedule is prepared in this section. This is a more detailed schedule that is built from the previous assignment. This schedule shows the duration of the structural sequence, MEP rough-in, distribution and finishes. Cash Flow From the primavera schedule, each activity is associated with the cost and a cost load schedule is prepared. Cash flow schedules for the owner and the general contractor are created. The “S” curve (Cumulative payments) is shown on the graph.
CRAIG DUBLER STEVEN F. UDVAR-HAZY CENTER
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SITE LAYOUT PLANNING Excavation Phase
Elev. = 0 m
Access Road
Dul
les I
nter
natio
nal A
irpor
t
Temp Power
Fence
Trees
Trees
Slope back 45 degrees
Elev. = 15m
ExcavateUtility Lines
ExcavateRetainage
Pond
To
stoc
kpile
WORK PATH WORK PATH
WO
RK
PAT
H
WO
RK
PAT
H WO
RK
PAT
H
WO
RK
PAT
H
ExcavateWater Run-off
Trench
• Equipment used for mass excavation includes: 3 scrapers, 4 Bulldozers, 1 Track hoe, along with 4 dump trucks. • A drainage system along with a retainage pond was constructed for water run-off • In total30,000 Cubic Yards of soil was excavated from the site. • Because of the size of the site, most can be stock piled and used later, although
about 35 percent will need to be trucked away to an adjacent site. •
CRAIG DUBLER STEVEN F. UDVAR-HAZY CENTER
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Superstructure Phase
• Site is not very congested, which allows for staging of materials • Site can get muddy, so materials should be elevated • Construction path starts from right to left according to crane paths above • Due to the change in elevation, total of three cranes will be onsite at once
o Two crawler cranes are used in constructing the Main Hangar o One crawler crane is used for the erection of the steel in the Public
Amenities • Steel for Main Hangar is delivered and erected in pieces
o Connections are bolted to save time and allow for adjustments o Two cranes are needed to walk center section into place
• Tower is built in three sections up to 5th Floor o “Egg” on top is erected prior, then lifted by crane into place
Crane Path
`
`
Exec. Parking
Temp. Offices for G.C.
(Approx area)
Water Retainage
Tem
p.O
ffic
es
for S
teel
Sub
(A
ppro
x ar
ea)
Temp. Offices for G.C.
(Approx area)
Temp. Offices for Subs
(Approx area)
Concrete truck
Concrete truck
Employee Parking
I-MAX
Spa
ce H
ang
ar
Main Hangar
Central Utility Plant
TowerSite Wall
Crane
Crane
PumpTruck
Steel Staging
Mis
c.St
agin
g
Dul
les I
nter
natio
nal A
irpor
t
Steel Staging
Steel Staging
Crane
Public Amenities
Employee Parking
Exec
. Par
king
Temp Power
GuardGate
Hydrant
Fence
Equipment Path
Equipment Path
Dumpster
Dumpster
Dumpster
Dumpster
Trees
Trees
Equipment Path
Crane PathCrane Path
CRAIG DUBLER STEVEN F. UDVAR-HAZY CENTER
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Finish Phase
• Site starts to get congested when site construction begins • Planes are brought in from Dulles on the access road
o Site must be clean for planes to taxi o Parking is limited due to Media
• Tower and Theater finish materials are delivered to floors by crane • Crane is also used for pouring site walls • Staging must be moved when site work progresses
Staging
Temp. Offices for G.C.
(Approx area)
Water Retainage
Tem
p.O
ffic
es
for S
teel
Sub
(A
ppro
x ar
ea)
Temp. Offices for G.C.
(Approx area)
Temp. Offices for Subs
(Approx area)
Employee Parking
I-MAX
Spac
e H
ang
ar
Main Hangar
Central Utility Plant
TowerSite Wall
Crane
Misc.Steel Staging Public
Amenities
Exec
. Par
king
GuardGate
Hydrant
Fence
Work Path
Work Path
Access Road to Dulles
Dul
les I
nter
natio
nal A
irpor
t
Wor
k Pa
th
MEP Staging
StagingStaging
Dumpster
Dumpster
Dumpster
Dumpster
Trees
Trees
CRAIG DUBLER STEVEN F. UDVAR-HAZY CENTER
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TEMPORARY UTILITIES
In order to achieve the best quality work, Architects, general contractors and the subcontractors must pay close attention to the materials handling processes including fabrication, delivery, storage, and installation. On the other hand, a safe environment for workers is also very important. Proper material management is essential for both obtaining the best quality work and providing a safe environment for workers. Under each section of the specifications, it states the requirement for each type of materials. Temporary utilities are described in section 1510 in the specifications. Here, it states the general requirement for each utility including light and power, heat and ventilation, and construction water. Adequate temporary lighting and power are required for the building, the site, and the field offices to serve construction trades during the entire project.
Temporary ventilation is provided for comfort and protection of workers, for proper drying of wet work, and for proper curing of installed materials. Temporary Heat is provided to ensure suitable working conditions, for storage, and also curing of products and materials. These elements are all tied with material management and in the following paragraphs, two specific materials: Cast-in-place concrete and Spray-Applied Fireproofing, are discussed in detail.
Cast-in-place concrete is used throughout the building and site. Cast-in-place
concrete is used in foundations, machine and other equipment bases, as well as concrete slabs and curbs. The quality of concrete is very crucial to the building and the contractor must provide extra care during the mixing and curing process. During mixing, if the concrete is under hot weather or conditions that will accelerate the setting of concrete, a shorter mixing time or admixture to slow the curing process may be required. When air temperature is between 85 to 90 degrees Fahrenheit, the contractor must reduce the mixing and delivery time from 1 ½ hours to 75 minutes. When air temperature is above 97 degrees Fahrenheit, they must reduce the time to 60 minutes.
During curing process, the contractor needs to protect the working area from premature drying, temperature extremes, rain and flowing water. They are required to cure continuously without allowing the concrete to dry. This will prevent hydration of cement and hardening of concrete. They also need to maintain the curing temperature; which is above 50 degrees Fahrenheit. Therefore, in cold weather, they will need to provide temporary heat to maintain the required temperature. In addition, when air temperature is below 40 degrees Fahrenheit or above 80 degrees Fahrenheit, the concrete needs to be tested hourly and a set of compression specimens is made each time.
CRAIG DUBLER STEVEN F. UDVAR-HAZY CENTER
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Spray-Applied Fireproofing is required to be handled with care, as described in the manufacturer’s instructions. Before applying the fireproofing, the material must be stored in dry area without any damages. Materials must be used prior to the expiration date. Specific environmental requirements are to ‘maintain an air and substrate temperature of 40 degrees Fahrenheit for 24 hours before, during, and for 24 hours after application; provide temporary enclosures and heat as required.’ For proper curing and thorough drying of fire resistive materials, the general contractor has to ensure natural ventilation is adequate. If it is inadequate, the general contractor must provide forced air circulation. There is no specific requirement on temporary electrical and power for both cast-in-place concrete and applied fireproofing. Therefore, requirements for those are simply followed as described in the temporary utilities sections provided by the contractor.