Overall View of Site Works (Click image to enlarge for details)
Construction Modelling and Control Plan (CMC Plan)
The Construction Modelling and Control (CMC) Plan is a virtual prototyping platform for visualization, communication and analysis of construction programme, construction co-ordination, identification of areas of conflicts, illustration of construction activities and construction method of major activities.
CMC Plan is a powerful tool to enhance planning for construction activities, and to reduce associated risks and programme delays.
This CMC technology will be adopted for the CWB project.
Dredging Works
Tunnel Excavation
Diaphragm Wall Construction
Simulation of Tunnel Construction within CBTS View Video
Feature Buildings
The environmental impacts induced by the east ventilation building and its associated exhaust vent shaft arose public concern. From April to June 2007, we consulted the local residents on the provision of these facilities. We explained to the residents that as indicated in the results of the environmental impacts assessment the vent shaft would not cause unacceptable environment impacts. To address their concerns, an electrostatic precipitator system will be installed to remove most of the respirable suspended particulates from the tunnel exhaust; and split the exhaust vent shaft from the east ventilation building to the northern tip of the eastern breakwater of the Causeway Bay Typhoon Shelter, a location further away from the residential area.
In July 2009, we consulted the Central & Western District Council, the Wan Chai District Council as well as the Eastern District Council on the appearance of the three ventilation buildings, exhaust vent shafts and the tunnel administration building. After acquiring their views, we have enhanced the aesthetic designs. To meet the expectation of the public, we have conducted roving exhibitions from July to September 2010 to directly collect views from the public and will consult with the District Councils again and the Harbourfront Commission with an aim to arriving at the best aesthetic designs.
The following videos show the different design options for the buildings.
The ventilation system for CWB tunnel is designed as a semi-transverse system with 3 ventilation buildings, namely West Ventilation Building (WVB), Middle Ventilation Building (MVB) and East Ventilation Building (EVB) and East Vent Shaft (EVS) situated at the Eastern Breakwater of the Causeway Bay Typhoon Shelter.
Advanced ventilation system will be installed in the tunnel to improve air quality. In case of fire, the system will contain and discharge the smoke inside the tunnel efficiently to ensure the safety of tunnel users. In addition, latest effective air purification system will be set up to clean the air exhausted from the tunnel to a higher standard.
Greening and Enhancement of Urban Environment
The CWB Project will take the opportunity for greening urban environment. The roof of the East Tunnel Portal of North Point will be developed into an integrated landscape deck.
Landscape Deck - Conceptual Illustration
Large number of different types of trees will also be planted at Central, Causwway Bay and North Point to provide leisure environment in urban area. Highlights of the landscape proposal are as follows:
Central Section
Landscape Highlights
Along Man Po Street and Finance Street, a yellow flowering tree avenue is proposed along both sides of the depressed tunnel approach road. Evergreen trees with large crowns are proposed north of Man Po Street to supplement the greening effect of the existing trees. Palm trees are proposed to supplement the existing palm avenue north of Man Kwong Street. Part of the Rumsey Street Flyover will be demolished and converted to amenity areas with tree and shrub planting.
Causeway Bay Section
Landscape Highlights
Facilities of Victoria Park to be affected by the proposed Slip Road 8 will be re-provided within the park on a like-for-like basis. Buffer tree planting is proposed on both sides of the proposed Slip Road 8. Ornamental trees and shrubs planting are proposed for the amenity areas at Hing Fat Street to enhance the roadside visual amenity of the street.
North Point Section
Landscape Highlights
To mitigate the visual impact of the noise barriers and enclosures, vertical green panels are proposed at the lower portions of the elevation of the noise barriers and enclosures. Furthermore, viaduct planters with shrub planting are proposed alongside the flyover facing the residential areas. To enhance the aesthetic value outside the eastern portal structure, a landscape deck is proposed with skylight windows maximizing natural light penetration for a better driving environment.
Tunnel Buildings
Landscape Highlights
Trees and shrub planting will be proposed at the building perimeters to soften the buildings and to screen views from the adjacent visually sensitive receivers. Green roof providing visual interest to adjacent visual sensitive receivers will be proposed on the flat roof of the Ventilation Buildings. For the Administration Building under the IEC bridges, shade tolerant shrubs will be proposed at the amenity directly under the bridge deck, and semi-shade tolerant trees will be proposed at the edge of light shadow to strengthen the buffering effect.
The landscape proposal will be further developed and amended as works progress.
