Challenges in construction of Marina Bay Construction duration cost estimation

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Marinabaysands
By - BIMENPREET KAUR (A1904016029)
PRERNA SHARMA (A1904016026)
Section - A , 4th year
PROJECT MANAGEMENT CASE STUDY

2. Project startingdate: 26 May 2006 – Opening date: 27 April
2010 (soft opening), 23 June 2010 (official opening), 17
February 2011 (grand opening)
– Number of stories: 57
– Number of rooms: 2561
– Height: 207 m (679 ft.)
– Area: 249,843 sq. m
Location: Bayfront Subzone, Downtown Core,
Singapore
Architect: Moshe Safdie
The client: Las Vegas Sands (LVS) Corporation
Main contractor: SsangYong Engineering and
Construction
INTRODUCTION
Completed: 2010
Contractor: Ssangyong Engineering
& Construction Co., Ltd

3. ● High-density and mixed-use
integrated resort complex that
brings together
● 2,560-room hotel, a 120,000
square meter (1,292,000 square
feet) convention centre,
● A shopping mall, an Art & Science
museum
● Two Sands Theatres,
● Six restaurants
● A casino.
SITEPLAN

4. General parameters of the design were
• EXPLORE (new living and lifestyle options)
• EXCHANGE (new business ideas)
• ENTERTAIN (rich cultural experiences)
• 55 Stories of hotel
• Garden on top of 1 hectare
• 150 m (492 ft) infinity pool
• Primary driving element of design was the
need for a continuous atrium running along all
three towers
• Tapering of the building was then conceived
DesignConcept

6. timeline

7. Costestimation
The price of the land: S$ 1.2 billion (560,000 𝑚2 )
– Initial estimation: S$ 3.85 billion (S$ 5.05 billion including the land price)
– Final project cost (including the land price): S$ 8 billion
– Deviation from the initial estimation: S$ 2.95 billion
– Cost overrun: 58.42 %
Final cost for development - 8 billion dollar
Cause of increase in project cost
With the escalating costs of materials, such as sand and steel, and labour shortages
owing to other major infrastructure and property development in the country

8. Foundation design
● Marina Bay Sands is on reclaimed land,
comprising sand infill overlying deep soft clay
marine deposits, above an underlying very stiff-
to-hard Old Alluvium (OA) layer
● The average basement excavation depth was
around 20m, and with over 40% of the concrete
construction occurring 18m-35m underground.
● 50m bored piles up to 2.8m in diameter

9. Circular diaphragm walls for minimum strutting
To overcome the challenges of the bulk
excavation and minimise shoring in the difficult
soil environments,
It included five huge reinforced concrete
cofferdams:
● two circular, 120m diameter, in the Sands
Expo and Convention Center (MICE)
area.
● one circular, 103m diameter, and one
twin-celled and peanut-shaped, 75m
diameter, in the hotel area.
● one semi-circular, 65m radius, in the
ArtScience Museum area.

10. The towers rise from their base in two halves before merging
some 20 above and then reaching up to over 50 storeys in
total.
Spanning the top floors is the SkyPark, an expansive structure
in its own right that bridges the towers and culminates in its
66.5m cantilever beyond the northernmost
tower.
The Museum’s form, in turn, highlights the galleries within
and anchors the north end of the resort along a
promontory on the bay.
Structure

11. Superstructure
● Building the very inclined towers 1 and 2 as this was impossible without
massive temporary works.
● Rigorous studies early in the design stage to assess the available
construction options concluded that it would be very costly, if not
practically impossible, to construct the towers without introducing lock-
in stresses on the structures, and so reasonable lock-in stresses were
considered in the designs of the key structural elements.
● the main contractor and specialist advisor together devised a temporary
works system combining post tensioned and steel strutting systems.
● The latter were installed to prop the sloping walls against the straight
walls so as to limit movement, while a series of vertical post-tensioned
tendons were provided in the walls to control the lock-in stresses As
tower 3 had an almost vertical geometry, it could be constructed
without any temporary works.

12. Sky Park
The 38m wide and 340m long Sands SkyPark is the world’s longest habitable cantilevered observation
deck, and has now become a symbolic icon for Singapore.
The SkyPark consists of a steel frame with composite slab
for flooring above towers 1 and 2
Major challenge
to cater for the natural movements of the towers upon
which the SkyPark was to be supported, and this was
met through the design and construction of five
distinct joined plates
The movement joint strategy was to split the SkyPark into three zones that correspond to the hotel towers, and isolate
each portion laterally.
The SkyPark elements are fully articulated to allow for differential movement of the towers under gravity, wind and
seismic loads, and form the bridge trusses already noted between the towers.
While simply supported, the bridge bearings are provided with special ties to hold each
deck in place in the event of an earthquake.

13. Construction Sequence
● 14-main steel segments were prefabricated off site and lifted into place via strand jacks
● This method took cues from bridge building when lifting the segments into place.
● Stranding jacking with hydraulic jacks were used to lift the box girders and slide them into place.
● The Cantilever was pre-assembled at grade to assure proper fit and then disassembled and lifted into place and
attached to a secondary beam at the top of the hotel tower.
● 7000 tons of steel work was erected in 13 weeks to build the skypark.
● Precast concrete
construction and
prefabricated
steelwork were used
wherever
appropriate to
increase off-site and
minimise on-site
construction work.

14. ● Managers have to find and put together a large number of qualified labor who should be able to
speak or at least understandEnglish.
● This is enormous number of people and there is a big difference between cheap local people and
very expansive people from abroad whom the company have to pay travel and accommodation
fees.
● Also the labors work in an extreme condition on the site, so they have to be in a good physical
condition. There is a high probability of muscle injury. All labor should have a short stretching
before the each work day.
OTHERCHALLENGES