Case Studies

 

Proposed Residential Development at 5-7 Blue Pool Road

 
Notable Features
 
bullet Application of steel formwork
bullet Application of UPVC formwork
bullet Application of Timber formwork
bullet On-site sorting of waste
bullet Reuse of steel hoarding

Basic Information
 
bullet Location: Happy Valley
bullet Building Type: Residential 
bullet Contract Period: 494 days
bullet Gross Floor Area: 13,900m2
bullet Client: Dorfit Properties Ltd.
bullet Architect: Chung Wah Nan Architects Ltd.
bullet Structural Engineer: Harris & Sutherland Consulting Engineers
bullet E&M Consultant: Parsons Brinckerhoff (Asia) Ltd.
bullet Quantity Surveyor: Levett & Bailey Chartered Quantity Surveyors
bullet Main Contractor: Hsin Chong Construction (Asia) Ltd.
bullet Contract Sum: Approx. HK$ 210 million

Overview
 
The Works comprised a 27-storey apartment tower over a transfer plate with a mechanical floor underneath, the tower resting on a 3-level podium and a 1-level basement. 
 

The pile caps were of reinforced concrete. The structure was generally of reinforced concrete with columns and beam framing, load bearing walls and slabs.

 
The external wall was generally of reinforced concrete finished with granite cladding and curtain walling. Curtain walling with tinted reflective glass to residential towers and glass wall with clear tempered glass to podium.
 
The internal partitions were generally of reinforced concrete and solid concrete block wall.
 
The main roof was covered with waterproof membrane and finished with concrete tiling while podium roof garden was covered with waterproof membrane and finished with pool deck tiling.

Waste Management
 
bullet On-site sorting of waste
 
There was shortage of site space to install refuse chute and material hoist was used to transport the waste material to the ground level. During the concreting stage there was no sorting of waste performed. Waste material in form of a mixture of rubble and small piece of timber were packed in bags and transported to the ground level by hoist. If sorting was to be performed, a large number of labourers would be required. During the finishing stage, cement, PVC, tile and packaging waste material were sorted out in bags.
 
bullet Material Control
 
For reinforcement and tiles where the materials were supplied by the main contractor, a bonus scheme was adopted to encourage the sub-contractor to minimise the wastage of material. Normally, 5% of wastage was allowed. A mock up floor was also used to estimate the quantity of tiles required.
 
bullet Use of reusable materials
 
bullet Steel hoarding

   
Steel Formwork
 
Steel formwork was used for the circular columns with diameter larger than 1 metre to maintain a more rigid formwork for concreting. As the building is in the shape of an ellipse, steel formwork was also adopted to construct the edge beams at the frontage of the typical floors such that a better quality of curved surface could be formed. In order to achieve a 5 day floor cycle, the steel formwork for the edge beams were of handy type since the tower crane had been fully occupied for loading material and concreting. The steel formwork was scrapped for sale after completion.
 

 

UPVC Formwork
 
UPVC formwork was used for circular columns with diameter of about 1 metre. High strength concrete was adopted for podium floor. Since the UPVC formwork could not be reused after striking, there was no need to hurry with striking the formwork for the next floor, the high strength concrete could be kept in the formwork for curing for 5 days.
 

 

Timber Formwork
 
Timber formwork was used for constructing the non-typical area and the floor slab.
 

Contact of Contractor
 
Hsin Chong Construction (Asia) Ltd.
Hsin Chong Center, 107-109 Wai Yip 
Street, Kwun Tong, Kowloon
Tel: (852) 2579 8238
Fax: (852) 2516 9430
 

 

Low-Waste Buildings Technologies & Practices
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