STUDI BANDING PROYEK SEJENIS 1.

2 Description
Location : Alexandra Road/ Depot Road
Tenure : 99 years wef 11 Feb 2009
1. THE INTERLACE - SINGAPORE Legal Description : Lots 2443T, 3875V & 1531A MK 01 at Alexandra Road / Depot
Road
1.1 Location Developer : Ankerite Pte Ltd (ROC: 199701357H)
Project Account : (DBS Bank for Project A/C No: 003-700075-2 of Ankerite Pte Ltd)
The Interlace is one of the largest and most Site Area : 80,761.8 sqm (est. 869,320 sqft)
ambitious residential developments in Singapore. It sits on Plot Ratio : 2.1
an elevated 81,000 square metre, 99-year leasehold site Expected TOP Date : 31 March 2015
bounded by Alexandra Road and Ayer Rajah Expressway. Expected Legal Completion Date : 31 March 2018
Car Park Lots : 1,132 (inclusive of 10 handicap lots) and 76 strata lots (2 lots per
garden house)
Maintenance Fees (estimated) : $3.48 per share value (before GST)
Type A (2 bedroom) - $248 to $289
Type B (3 bedroom) - $289 to $494
Type C (3 + study/family) - $289 to $578
Type D (4 bedroom) - $331 to $620
Type E – Multi Generation - $331 to $578
Type F (PH) - $415 to $662
Type G (3 bedroom Garden House) - $415 to $456
Type H (4 bedroom Garden House) - $456 to $495
The site completes a nine-kilometre long green
belt that stretches between the Kent Ridge, Telok Consultants
Blangah Hill and Mount Faber parks. With about Lead Designer : Office for Metropolitan Architecture (OMA)
170,000 square metres of gross floor area, the Local Architect : RSP Architects, Planners and Engineers Pte (Ltd)
development offers 1,040 apartment units of varying Main Contractor : -
sizes with extensive outdoor spaces and landscaping. Quantity Surveyors : Davis, Langdon & Seah Singapore Pte Ltd
Picture:map of interlace Landscape Architect : ICN Design

Product Details
Type of Development : Condominium
Total No. of Units : 1,040 residential units + 8 retail shops
Project Description : Proposed Condominium Housing Development comprising 23
blocks of 6/12/18/24-storey apartments (Total 1,040 units) with
commercial use at 1st storey and ancillary facilities at Alexandra
Road/ Depot Road.

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Unit Mix : Areas given below are estimates only. isolated, vertical towers – and features 31 super blocks, each six stories tall, stacked in a hexagonal arrangement
around eight large-scale courtyards.

Unit Description Area Range Area Range

Type Share Value
(sqm) (sqft)
2 bedroom A 75 - 125 807 – 1,346 71 - 83
2 bedroom with PES A(P) 146 - 149 1,572 – 1,604 71 - 83
3 bedroom B 117 - 177 1,259 – 1,905 83 – 95
3 bedroom with PES/ B(P) / 196 - 352 2,110 – 3,789 95 – 142
Private B(R)
Roof Garden
3 + Family/Study C 148 - 211 1,593 – 2,271 83 – 107
3 + Family/Study with PES/ C(P) / 261 - 488 2,809 – 5,253 119 – 166
Private Roof Garden C(R)
4 bedroom D 180 - 234 1,938 – 2,519 95 – 107
4 bedroom with PES/ D(P) / 287 - 529 3,089 – 5,694 119 – 178
Private D(R)
Roof Garden
4 bedroom – Multi E 185 - 241 1,991 – 2,594 95 – 107
Generation These interlocking blocks resemble a ‘vertical village’ with cascading sky gardens and roof terraces, with
4 bedroom – Multi E(P) / 262 - 495 2,820 – 5,328 119 – 166 extensive amenities and facilities being interwoven into lush vegetation. With such expansive greenery and
Generation E(R) landscaping, the project is at home on the nine-kilometre long green belt that stretches along Kent Ridge, Telok
with PES/ Private Roof Blangah Hill and Mount Faber parks. Based on a series of environmental studies, the units, facilities, vegetation
Garden and water bodies are strategically positioned to maximise shading and reduce urban heat gain, thereby providing
Penthouse F 293 - 586 3,154 – 6,308 119 – 190 a cooling and naturally ventilated environment.
3 bedroom Garden House G 267 - 314 2,874 – 3,380 119 – 131
4 bedroom Garden House H 313 - 361 3,369 – 3886 131 – 142
Total: 1,040 units

1.3 Design Concept

The Interlace has stood out with its iconic design that complements the surroundings as well as its
innovative concept of spaces and community, and emphasis on sustainability and universal design. The 1,040-
unit development breaks away from the conventional typology of high-rise housing in Singapore – clusters of

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1.4 Floor Plan

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1.5 Respond to Urban Context (Accessibility)

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1.6 Providing Open space for public
A Central Square, Theatre Plaza,
and Water Park occupy the more public
and central courtyards and contain
numerous shared amenity areas such as
a clubhouse, function and games rooms;
theatre, karaoke, gyms, and reading
rooms; and a 50m lap pool and sun deck,
family and children’s pools. Surrounding
courtyards such as The Hills and Bamboo
Garden provide shaded outdoor play and
picnic areas with lower blocks around its
perimeter. The Waterfall, Lotus Pond,
and Rainforest Spa complete the eight
main courtyards and offer residents
further choices and areas in a more contemplative environment with additional swimming pools, spa gardens,
and outdoor dining.
Multiple barbeque areas, tennis and multi-courts, organic garden, pet zone, and ‘the rock’ line the
perimeter of the project and offer a wide selection of communal activities for residents. A continuous loop
around the site provides a 1km running track and connects the ‘internal’ courtyards to the activities around the
edge of the site.
The character of a vertical village embedded in a rich landscape of activities and nature is evident
throughout the project. Elevated roof terraces and sky gardens extend outdoor space on multiple levels with
views above the tree line to the surrounding courtyards, parks, sea, and city. The diversity of the various
offerings and atmospheres of natural environment encourage social interaction with the freedom of choice for
different gradients of privacy and sharing, contributing to the overall sense of community.
Gardens are located over the rooftops,
while staircases are positioned at the overlaps
between blocks. Other communal features
1.7 Facilities, Furnishing, and Equipments
include a lotus pond, a waterfall, an open-air
1. Furnishing and Finishes:
theatre and a rock garden.
Living/Dining, Foyer, - Floor
The Interlace generates a space of
Passageway, Yard, Utility, Homogeneous/ Ceramic tiles with matching tile skirting
collective experience within the city and
Pantry Store, Pantry,
reunites the desire for individual privacy with a
Household Shelter (HS)
sense of togetherness and living in a
Family, Study - Floor
community. Social interaction is integrated with
Homogeneous/ Ceramic tiles with matching tile skirting and/or
the natural environment in a synthesis of
timber parquet with timber skirting
tropical nature and habitable urban space.
Bedrooms, Internal Staircase - Floor
The notion of community life within a
Timber parquet with timber skirting and/or laminated flooring
contemporary village is emphasized throughout
with matching skirting
the project by an extensive network of
Bathrooms, Powder Room, - Wall
communal gardens and spaces. A variety of
Kitchen, WC Homogeneous tiles/ Ceramic tiles
public amenities are interwoven into the
Floor
landscape, offering numerous opportunities for
Homogeneous tiles/ Ceramic tiles
social interaction and shared activities
Store (ST) - Floor
integrated with the natural environment.
Same finishing as area outside Store

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Balcony, Balcony/Terrace, - Floor 2. Recreational Facilities :
Terrace Homogeneous tiles/ Ceramic tiles with matching tile a) Tennis Courts
skirting b) Multi-purpose court
Private Roof Garden - Floor c) Play Zone
Homogeneous tiles/ Ceramic tiles/ Pebble wash/ Timber deck d) Outdoor Exercise Station
Courtyard, External Staircase - Floor e) Gardening Zone
Homogeneous tiles/ Ceramic tiles f) Clubhouse on 1st storey
Private Enclosed Space (PES) - Floor g) Lotus Pond
Homogeneous tiles/ Ceramic tiles with matching tile skirting h) BBQ Promenade
and/or part turfing i) Pet Zone
Planter (PL) - Floor j) Jogging Track
Cement screed with waterproofing k) Party Pavilion
Other Provisions : (a) Kitchen Cabinets l) Landscape Courtyards
 Kitchen cabinets complete with solid surface worktop, a. Central Square
single bowl stainless steel kitchen sink and mixer tap, gas b. Water Park
hob, electric hood and microwave for Type A & E - Lap Pool (50m)
(1bdrm/studio). - Kids Pool
 Kitchen cabinets complete with solid surface worktop, - Family Pool
one and a quarter bowl stainless steel kitchen sink and - Jacuzzi Pool
mixer tap, gas hob, electric hood and oven for Type B, C, c. Play Hills
D, E, F, G, H. d. Spa Valley
(b) Wardrobes provided for all Bedrooms. e. Theatre Plaza
(c) Hot water supply to all Bathrooms and Kitchen except f. Bamboo Garden
Powder Room, Pantry, Yard, WC. g. Lotus Pond
(d) Town gas supply to Kitchen h. Waterfall Terrace
(e) Single/Multi-split air-conditioning system - Reflective Pool
 Wall mounted fan coil unit for Living/Dining, Family, - Party Pool
Study and all Bedrooms (Type A, B, C, D, E, G, H) (m) Sky Terraces
 Concealed ducted fan coil unit for Living/Dining, Family
and all Bedrooms (Type F)
(f) Private Enclosed Space (PES), Balcony, Balcony/Terrace, 1.8 Services
Terrace, Planter (PL), Yard and Private Roof Garden - Metal 1. Parking
railing and/or RC parapet wall and/or brickwall All traffic and parking is accommodated in a single layer below the landscaped ground level. A large
(g) Security System number of open-air voids allow light and air to the semi-sunken parking deck, creating areas of lush vegetation
 Audio intercom in all apartment units. and trees below ground and connecting these spaces visually and through planting to the courtyards above.
 Card access control system at lift car and pedestrian
gate. 2. Site Access
 Transponder system to car park barrier. The primary pedestrian route through the project leads residents from the main entrance through and to
(h) Data outlet points c/w Category 6 or other appropriate the courtyards as primary points of orientation and identification – you live in a courtyard, a space, rather than a
cabling in Living/Dining, Family, Study and all Bedrooms. building or an object. Pedestrian circulation is grouped and bundled according to the density of residents around
each courtyard in a central ‘connector’. A system of secondary footpaths brings residents from the connector to
the private front doors of their homes.

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1.9 Structure & construction system
T.Y. Lin International Pte Ltd (TYLI) worked together with the contractor, Woh Hup (Private) Limited
(WH), on this Design & Build project, in order to develop the winning concept. The process encompassed the
consideration of both design and construction methodologies for the long span transfer structure. The Interlace
consists of 31 superblocks accommodating a total of 1,040 units.

 Design and construction of the long span transfer

Structure
The architectural concept demanded the design of a long span
transfer structure that would support the six-storey block across
two main cores at the ends of each block. The highest block was
constructed at 60 m above ground, with a total of 20 transfer
deck structures laid out as shown in picture. The challenge was
to design a suitable transfer structure and devise an appropriate
construction method to facilitate the construction of the
superblocks at height. The development of the optimum
construction methodology and the design of the deck and the
main cores were heavily inter-related. Thus, the influence of the
design on the construction methodology and vice-versa were
identified early and taken into consideration during the design
development

 Lateral stability
The 23 vertical main cores form the main backbone of the buildings for direct load transfer to the foundation  Structural modelling
piles and provide the lateral stability. Owing to the layout of the interconnected buildings, the overall stability Rigorous and comprehensive structural analysis was carried out, to study and capture overall building
under wind and notional load is good, with a maximum building drift of 1/1100, which is well above the behaviour arising from the complex nature of the building layouts and the magnitude of the project. This
maximum limit of 1/500 included staged construction analysis, as shown in picture below, which is not commonly performed on a typical
building, as well as:
 Mega frame design o Global analysis to obtain the interlocking force and moment envelope in mega columns.
One of the challenges arising from the unique interlocking building arrangement is the multi-directional stresses o Local analysis for the design of transfer decks.
and deformation that are not common in normal buildings. Under the loadings from the elevated six-storey
blocks, the main cores are subjected to forces in different directions at each super level stack

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  Method of construction of transfer deck

Construction of the transfer deck at height was a challenge, especially at the highest stack where the
soffit of the block is almost 60 m above the ground level. Considerable thought went into the selection of the 7th storey plan.
construction methodology.
Finally, a ‘balanced cantilever’ methodology, commonly used for construction of bridges was adopted for
this heavy transfer deck structure. This method helped to reduce the construction load on the structural steel
shoring as each segment of the box girder was cast in stages.
Redundancy was built into the casting sequence so that after each stage of casting, the transfer deck was
self-supporting. Subsequent stages were cast to the point where the deck meets in the centre,

(a) 7th storey: Stage 1 of transfer deck casting (b) 7th storey: Stage 2 of transfer deck casting

Staged construction

(c) 7th storey: Stage 3 of transfer deck casting (d) Typical storey casting
3D Global SAP2000 model - staged construction analysis.
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1.10 Economic Cost Despite The Interlace's unique architecture, which was a challenge to construct, the project was two
months ahead of schedule and the construction of its structure was completed three months ahead of the initial
The highly efficient system of compact cores, minimal circulation, and maximized floor area allowed the plan. The fast construction speed was made possible by a slew of productivity improvements adopted by the
project to be realized on a budget for reasonably priced private housing, within the competitive context of project team.
Singapore’s market.
The Urban Habitat Award recognizes The Interlace’s significant contributions to the urban realm; its
exemplary integration with its surrounding environment; and its ability to add to the social sustainability of its
immediate and wider context, environmentally, socially, and culturally.

1.11 Mechanical & electrical system

1.12 Sustainability considerations

A series of site specific environmental studies were carried out and evaluated (wind, solar and daylight
analysis) to determine intelligent strategies for the building envelope and landscape design. Early and
comprehensive incorporation of low-impact passive energy strategies allowed the project to be given the Green
Mark GoldPlus Award by Singapore’s Building and Construction Authority.
All apartments receive generous amounts of daylight throughout the day while the unique massing of
the project provides a sufficient level of self-shading in the courtyards which helps maintain comfortable outdoor
spaces year-round and continuous usage of the courtyards and their communal functions.
Water bodies have been strategically placed within well-defined wind corridors. This allows evaporative
cooling to happen along wind paths, reducing local air temperatures and improving the thermal comfort of
outdoor recreation spaces in strategic micro-climate zones. Extensive balconies and protruding terraces form a
cascading vertical landscape across the facades and further connect the green roofs and shared public terraces
between the building volumes. Overall, the project appears not only surrounded by the tropical vegetation but
embedded within it.

1.13 Climate factor

Located at the tip of the Malay Peninsula, Singapore (which consists of one main island and 63 smaller
ones) lies about 1 north of the equator. The weather year-round is hot and wet. OMA says that the design of the
complex responds 'carefully' to this tropical climate and that the project features energy-saving technologies.
With 4.68 million people as of 2007, Singapore is the world's second most densely populated
independent nation after Monaco. But just as one can feel lonely in a crowd, residents in this ultra-urban
environment may lack opportunities for socializing.
OMA's design enables its residents to enjoy communal outdoor spaces, increasing people's chances of
interaction. According to OMA's Scheeren, "This project directly addresses concerns of shared space and
community in a contemporary society."

1.14 Local factors on green architecture issues

The design capitalizes on the generous size of the site and further maximizes the presence of nature by
introducing extensive roof gardens, landscaped sky terraces and cascading balconies, and minimizing above-
ground vehicular circulation, such that there will be large green areas within the development. The Interlace
incorporates sustainability features through careful environmental analysis of sun, wind, and micro-climate
conditions on site and the integration of low-impact passive energy strategies.

1.15 Construction method & strategy

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Productive Methods Adopted by Woh Hup for The Interlace
 Heavy-duty shoring system
Seven prefabricated heavy-duty scaffolding staging sets were rotated within the site to keep pace with 1.16 Landscape
the construction cycle of each building block. Each component of the shoring system is of the “wedge
and click” type for easy and safe installation. The estimated productivity improvement is about 115% The Interlace landscaping takes up eight-hectares, with the arrangement of the buildings maximizing the
compared to the conventional scaffolding system. presence of the surrounding tropical floral by introducing extensive roof gardens, landscaped sky terraces,
cascading balconies and lush green areas. By stacking the apartment blocks, the design generates a
 Precast construction multiplication of horizontal surfaces populated by extensive roof gardens and landscaped terraces that in
Woh Hup used precast construction including civil defence shelter doorframes, staircases, planter boxes aggregate provide 112% green area – more than the size of the inbuilt site.
and double slabs. The estimated productivity improvement from these precast activities is about 80%
compared to cast-in-situ construction.

 Productive formworks
Various productive formworks such as horizontal tableform, condek formwork and vertical steel
formwork were adopted to reduce the construction cycle time. The estimated productivity improvement
is about 80% compared to conventional timber formwork.

 Innovative cast-in groove lines

Innovative cast-in groove lines were used to form the hexagonal patterns at the transfer decks soffits, to
reduce double work. This resulted in an estimated productivity improvement of about 200%

The continuous landscape is also projected vertically, from the planting of green areas in open-air
basement voids, through balconies and rooftop gardens. The private balconies give apartments large outdoor
space and personal planting areas. Cascading gardens spill over the facades of the building drawing a visual
connection between the elevated green refuges and expansive tropical landscape on the ground. Complex is also
embedded within tropical flora, letting nature expand. Sky gardens provide panoramic views across The Interlace
site and throughout the complex.

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 Water bodies have been strategically placed within defined wind corridors, which allow evaporative
cooling to happen along wind paths, reducing local air temperatures and improving the thermal comfort of
outdoor recreation spaces in strategic micro-climate zones.

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