Case Studies


Tseung Kwan O Area 73A Phase 2


Notable Features
bullet Reduced construction waste due to use of factory manufactured precast concrete elements
bullet Application of large panel steel formwork
bullet Use of semi-precast slab
bullet Use of aluminium formwork for the construction of floor slab
bullet Use of precast facade
bullet Use of precast kitchen facade
bullet Use of precast bathroom
bullet Use of precast staircase
bullet Use of precast cladding
bullet Use of steel scaffolding

Basic Information
bullet Location: Tseung Kwan O Area 73A
bullet Building Type: Residential 
bullet Contract Period: 31/8/2000 – 30/11/2002
bullet Gross Floor Area: 96,440m2
bullet Client: The Hong Kong Housing Authority
bullet Architect: The Hong Kong Housing Department
bullet Structural Engineer: The Hong Kong Housing Department
bullet E & M Consultant: The Hong Kong Housing Department
bullet Quantity Surveyor: The Hong Kong Housing Department
bullet Main Contractor: Yau Lee Construction Co. Ltd.
bullet Contract Sum: HK$ 470 million

This project consists of two blocks of 41-storey domestic New Harmony 1 Block, one block of 8-storey Standard 30-Classroom Primary School (2000 Edition). The blocks contain 80 No. Type 3B, 880 No. Type 1B, 320 No. Type 2B, and 238 No. Type 1-2/P rental domestic units in 40 domestic upper floors. In addition, one 2-storey Automated Refuse Collection System and Junk Collection Point Compound will serve all residential blocks in Tseung Kwan O Area 73A by being connected to Phases 1, 3 and 4 via chute laid under Estate Road and surface-mounted against retaining wall.

Wall System

Large Panel Formwork is used to construct the structural walls of the Harmony Blocks. It is a typical feature of housing projects. The floor cycle is 6 days (Two  days for larger wings and one days for the smaller wings).



  Slab System
  Semi-precast slab is adopted for the structural floor of the flats. A 70mm precast slab serves as the formwork for a 90mm in-situ concrete layer, thus forming a 160mm thick concrete floor. This saves time in erecting and striking the timber formwork as well as reduces the timber waste.



  Aluminium formwork is used to construct the floor slab of the corridor of Harmony Blocks. This is an innovative feature of the project. The cost is even cheaper than that of timber formwork.



  Contact of Contractor
  Yau Lee Construction Co. Ltd.
  10/F, Tower I, Enterprise Square,
No.9 Sheung Yuet Road,
Kowloon Bay, Kowloon, Hong Kong
  Tel: (852) 2753 4388
  Fax: (852) 2753 4300

Precast Facade
This is also a typical feature of the housing projects. The problem of water leakage with this type of construction is primarily dealt with by the overhanging toe of the whole pre-fab unit which stops water penetration from the horizontal parts. The vertical joint is formed by the built-in of facade into the structure.


Precast Kitchen Facade
Precast kitchen facade with PVC openings for the drain pipes is an innovative feature of the project.




Precast Bathroom
Precast bathroom is also an innovative feature of this project. The bathroom is prefabricated in factory and transported to site as a whole. It is fixed to the building structure with the help of tower crane.


Precast Staircase
Precast staircase is a typical feature of housing projects.


Precast Cladding
Precast cladding is a new construction method for tiling works. The cladding panels are manufactured in the precast factory. The backing of the panels is lightweight concrete and the panels are fixed by holding brackets.


Advantages of the cladding panels:
bullet Reduced quantity of skilled labour
bullet Less wastage – wet trades on site such as plastering and tiling are eliminated
bullet Less waste produced
bullet Better quality
bullet Flexible time control – no setting and curing time are needed on site
bullet A clean and safe working environment is achieved


Steel Scaffolding
Steel scaffolding is used to construct the 8-storey school building. This provides a safe working platform and saves the use of bamboo scaffolding, thus reducing waste.



Low-Waste Buildings Technologies & Practices