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Transcript of Top-Down construction
Marriott Marquis Washington, D.C.
A 15 -story hotel with
Hensel Phelps Construction Co.
Thornton Tomasetti/A+F Engineers
Ahmed Atef Mahmoud
Ahmed Emad Khalifa
Ahmed Mohammed Abdelfattah
Ahmed Mohammed Sayed Ahmed
Ahmed Nazmy Nouh
Presented by :
Prof. Dr. Amr Abdelrahman
Faculty of Engineering, Ain Shams University, Structural Engineering Department,
4th year Structural Engineering.
Top-Down Construction ?
1-Sheet Pile Wall
2-RC Pile Wall
a-Strong bearing system.
b-Considered a water tight system.
c-Relatively greater lateral stiffness.
e-No noise and No induced vibrations.
Let's Go For Details
Steel Shear Studs
U shaped reinforcing bars
Diaphragm wall main steel
Bend out bars
Diaphragm wall main steel
Connection between Diaphragm Wall &Slab
Advantages of Diaphragm
a-Minimizing exposed earth surface.
b-Watering (working & haul areas) during dry period.
c-Using covering haul trucks.
2-Access of construction materials & machines
3-Access for removal of excavated soil
Excavating the panel
Installation the reinforcing cage
Filling the pannel with concrete.
Cross lot Bracing
Tie Backs Anchors
Senior Project Engineer
Associate at Thornton Tomasetti
“ The use of the so-called top-down construction method on a project that required excavation to a depth of nearly 100 ft helped to resolve a number of site challenges. ”
a) Large soil pressure.
b) Ground water pressure.
c) High lateral stiffness.
d) Permanent load bearing wall.
e) Minimize construction vibration and noise during installation.
95 Panels around 450 m
0.9-->1.05 m thickness
37 m Deep
14775 cubic m
1800 Tons of Rebar
Steel -> 30% Total Slab Area
Steel plates ( 1.5 - 5 cm)
W14 wide flanges
a) Slab openings (sometimes 1/2 area)
d) High lateral earth pressure
c) Construction Joint
d) Floor vibration
e) Resist temporary Force at each stage
Flat-plate concrete slab (45 -> 60 cm)
Partial VS Complete
section might be 25 to 38cm around openings
( require non linear, staged construction analysis)
pour strips used
210 m long structure
concrete Shrinkage occurs in the smaller lengths of the concrete frame
Reduce the amount of steel column by 100 ton
W14 Steel Column
Steel can easily spliced together
146 Drilled Piers
1.5-2.6 m Diameter
42 m Deep Shafts
1180 tons of Column steel
Construction Load & Structure Self Weight
The full building design loading
25 m Diameter
30 m Deep
3 tower cranes
4 dig cranes
30 m Deep
92000 sq m excavation area
(span 25 m)
70 X 40 m
“ This is a top-down project, meaning that work above and below ground will take place simultaneously via a platform built at grade. D.C. and Marriott International Inc. officials are confident the hotel will open as scheduled on May 1, 2014. ”
Civil Engineering Magazine
Washington Business Journal
Ground Water Table
Bucket Of the Muck Hoist
Ground Water Control
1-The road traffic is partially disturbed
2-No obstruction during excavation due to bracing
3-No noticeable lateral deformations
Used In Tunneling
The Flexibility Of Slabs ?
Section of the slab
Openings in the slab
Alf Maskan Station
Line 3 Phase 4
Haroun Station --> Cairo International Airport