Since CKR will pass through the densely developed areas in Kowloon, the construction of CKR will inevitably affect nearby residents. We will try to minimize the construction impacts as far as possible and contain such impacts within acceptable levels.
Construction Method for Tunnel
CKR Tunnel has adopted three construction methods:
Yau Ma Tei Section – from Yau Cheung Road to Shanghai Street
The first tunnel section starts from Yau Cheung Road at West Kowloon Reclamation Area and passes through the junction of Ferry Street and Kansu Street, going into Kansu Street to Shanghai Street, with a total length around 400m and will be constructed by cut-and-cover method.
Temporary traffic arrangement will be required for the construction of the tunnels of CKR. The temporary traffic arrangement mainly involves traffic lane closure and traffic diversion. Temporary traffic arrangement will be carefully planned, designed and implemented to minimize the impact on the vehicular traffic and pedestrians. Public consultation will be carried out prior to the implementation of temporary traffic arrangement.
King’s Park, Ho Man Tin and Ma Tau Wai Section – from Shanghai Street to Ma Tau Wai
The second section of the tunnel, with a total length of about 2.76km, begins at Shanghai Street going through Nathan Road, King’s Park, Ho Man Tin and Ma Tau Wai. This tunnel section is about 30 to 140m below the ground level and will be constructed in the rock stratum. As there is a considerable separation between the tunnel and foundations of buildings, the tunnel construction will not affect the structural integrity of the buildings along the tunnel alignment.
The tunnel will be constructed by the drill-and-blast method. This method has been used in Hong Kong for more than 40 years. Some successful examples of road tunnels constructed using the drill-and-blast method include the Lion Rock Tunnel, Aberdeen Tunnel, Tseung Kwan O Tunnel, Shing Mun Tunnel, Tate’s Cairn Tunnel, Tai Lam Tunnel, Cheung Tsing Tunnel, Eagle’s Nest Tunnel, Sha Tin Heights Tunnel and Nam Wan Tunnel. Examples of railway tunnels constructed using the drill-and-blast method include the section of East Rail Line between Kowloon Tong and Tai Wai, MTR Island Line, Tung Chung Line, Tung Chung Line and Airport Express between Lai King and Tsing Yi, Tseung Kwan O Line, the Tai Lam section of West Rail Line and Disneyland Line.
Temporary explosive magazine will not be required for the CKR project. The explosives will be delivered to the site for immediate use and will not be stored on site.
Blasting will be carried out underground and will not affect the daily life of adjacent residents. The construction works will not affect the structural integrity of the buildings along the tunnel alignment.
Ma Tau Kok Section – Kowloon City Ferry Public Transport Interchange
There will be a 140m long cut-and-cover tunnel near the eastern end of CKR that will be constructed at the existing Kowloon City Ferry Pier Public Transport Interchange. The construction method is similar to the one at Kansu Street section at Yau Ma Tei.
Temporary Traffic Arrangement
To facilitate tunnel construction works, Ma Tau Kok Public Pier located above the tunnel alignment will be demolished and temporarily reprovisioned at King Wan Street Leisure Path. In addition to the demolition of the Public Pier, temporary traffic arragement schemes will be implemented to mantain the operation of the Public Transport Interchange during the construction period.
Major temporary traffic arragement at Kowloon City Ferry Pier Public Transport Interchange include:
Demolition of Ma Tau Kok Public Pier
Proper linkage will be provided between the temporary pier and Kowloon City Ferry Pier Public Transport Interchange for the convenience of the public. After the completion of the tunnel works, the Ma Tau Kok Public Pier will be reinstated at its original location.
Termination of the existing short-term lease car park at San Ma Tau Street near Wei Chien Court
The existing short-term lease parking lot at San Ma Tau Street near Wei Chien Court will be terminated to make room for the temporary relocation of the existing metered car park at San Ma Tau Street and the reprovisioning of Kowloon City Ferry Pier Public Transport Interchange.
Temporary relocation of metered car park at San Ma Tau Street
The existing metered car park at San Ma Tau Street will be relocated to the short-term lease parking lot in order to facilitate the construction works.
Temporary arrangement of transport facilities in Kowloon City Ferry Pier Public Transport Interchange
The existing transport facilities including bus stop, GMB stand, taxi stand and general lay-by at Kowloon City Ferry Pier Public Transport Interchange will be temporarily rearranged to facilitate the construction works. All transport services will remain unchanged. These facilities will be temporarily reprovided at their original locations as far as possible to minimise the impact on the users.
Kowloon Bay Section
The works for the Kowloon Bay section includes the construction of a 370m-long underwater tunnel in the sea bed between Ma Tau Kok and Kai Tak Development.
The tunnel will be constructed at a temporary reclaimed area using cut-and-cover method. The works will be carried out in two stages to maintain marine access to the northern part of Kowloon Bay and normal operation of the existing stormwater outfall. The Stage 1 works will be carried out at the part of Kowloon Bay near Kai Tak Development and will take about 26 months. We will form a platform of about 2 hectares through temporary reclamation for the construction of a tunnel of about 190m long. Diaphragm walls will be constructed along the two sides of the tunnel. Excavation will be carried out between the diaphragm walls for constructing the tunnel structure. We will remove the temporary reclamation upon the completion of the tunnel construction and restore the seabed to the original condition. The second stage will be carried out on the part of Kowloon Bay near Kowloon City Ferry Pier and will also take 26 months. The area of temporary reclamation for the second stage will be about 1.8 hectare and the length of the tunnel will be about 180m.
The reclamation works will not affect the existing ferry services of the Kowloon City Ferry Pier. Normal operation of the ferry services will be maintained during the construction period.
Environmental Impact during Construction
During the construction period, dust may be generated by operations such as site clearance, demolition of various types of structures and excavation. We will adopt suitable construction methods and implement mitigation measures in accordance with the provisions of the Air Pollution Control Ordinance and recommendations of the EIA report to minimize the impacts on nearby residents. These measures include:
- Providing hoardings at least 2.4 m in height around excavation works
- spraying water along haul roads within the construction
- sites to keep their surfaces wet providing wheel washing facilities on site entrances for washing vehicles
- leaving the sites spraying water on excavation sites and during handling of dusty construction materials
- covering stockpiled construction and demolition materials
- covering dusty materials during transportation
During the construction period, air-borne noise may be generated by operations such as site clearance, demolition of various types of structures and excavation. We will implement measures in accordance with the provisions in the relevant legislations and the recommendations of EIA report to reduce the noise impact on nearby residents. These measures include:
- Using low-noise construction plant
- Using acoustic mats, temporary movable noise barriers, acoustic sheds or enclosures to minimise the noise impact of construction operations
We will properly manage the construction sites to minimize the impact of construction works on nearby residents. These measures include:
- Maintaining vehicular and pedestian accesses to adjacent buildings
- Proper storage and stockpiling of construction materials
- Avoiding and removing immediately stagnant water on consrtuction sites
- Conduct regular inspection on site tidiness
During the construction of CKR, five site entrances will be used for the transportation of construction materials (consisting mainly of concrete and asphalt), construction machinery and construction and demolition materials (C&D materials) (including mainly rock and soil that will have to be disposed of as a result of excavation for tunnel construction). The proposed routes for disposal of C&D materials will make use of trunk routes which are far away from residential buildings. Furthermore, the trucks will avoid operating at peak hours as far as possible. We will conduct comprehensive traffic impact assessment to ensure that the impact of construction traffic will be controlled within acceptable levels.