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Knowledge Centre


"Railway Know It All" Comic


Chinese Version only for the content

  1. Railway Facilities



    Kelvin the Engineer introduces you some rarely noticed railway facilities.

  2. Railway Associated Works



    Beyond excavation, what works are needed when constructing railway in built-up area?

  3. Railway Tunnel Construction (Ⅱ)



    Drill and Blast buddies will tell you how to excavate a railway tunnel by using drill and blast method.

  4. Railway Tunnel Construction (I)



    Tell you how to build a railway tunnel by using tunnel boring and cut & cover methods.

  5. Railway Planning



    To share with you different railway planning knowledge from alignment planning, design of station entrance to railway service.


Database

  •   How do you ensure the safety factor for tunnel construction of the XRL project?  
    The MTR Corporation recognises safety is of paramount importance. During the planning and design stages of the Express Rail Link Project (XRL), the Corporation has duly conducted comprehensive assessments around the area in vicinity of the alignment. This includes a geologic and condition surveys of the structures nearby. The detailed design and construction methods are carefully reviewed and chosen based on the assessment results ensuring that the nearby structural integrity will not be affected.
    The MTR Corporation recognises safety is of paramount importance. During the planning and design stages of the Express Rail Link Project (XRL), the Corporation has duly conducted comprehensive assessments around the area in vicinity of the alignment. This includes a geologic and condition surveys of the structures nearby. The detailed design and construction methods are carefully reviewed and chosen based on the assessment results ensuring that the nearby structural integrity will not be affected.
  •   What are the benefits of using the Tunnel Boring Machine (TBM)?  
    Tunnel Boring Machine (TBM) tunneling is an effective and commonly used method in today’s tunnel construction around the world. Risk of settlement is greatly reduced and loss or movement of the underground water table will be avoided, significantly minimising the impact on the community and environment.
    TBM tunneling will be used for the construction of tunnels along Yau Tsim Mong, Sham Shui Po and Yuen Long districts, significantly minimising the impact to the densely populated communities and traffic.
  •   What is the TBM construction method?  
    During tunnel construction, the excavated face will be supported by a shield near the front of the TBMs while permanent precast segmental tunnel linings (walls) will be installed immediately behind the cutterhead of the TBM.
    Any voids between the excavated wall and the linings will be filled with cement grout.
    This will ensure the excavated surface is always supported and the impermeable tunnel walls will not lead to loss of ground and underground water.
  •   What is MTR’s experience in using Tunnel Boring Machines to facilitate tunnel construction?  
    Using the tunnel boring method is safe and reliable in tunnel construction, with examples of the Lok Ma Chau Tunnel of the East Rail Line and the Tsing Tsuen Tunnels of the West Rail Line.
    This tunneling method is effective in avoiding loss of underground water, minimising settlement and the impact to the environment and the neighboring communities.
    The tunnel boring method is also widely used worldwide, such as the Channel Tunnel in Europe.
  •   What is being done to protect the ecological environment during construction of the XRL project?  
    During the planning and design stages of the XRL Project, the Corporation has duly conducted comprehensive assessments and geologic surveys of the site areas and in the vicinity of the alignment. The detailed design and the construction methods are carefully reviewed and chosen based on the assessment results so that the ecological environment will not be affected.
    The MTR Corporation is experienced in building and operating tunnels in densely populated and environmentally sensitive areas, such as the Lok Ma Chau Spur Line.
  •   Will the tunnel construction and operation affect the structural integrity of the buildings nearby in Tai Kok Tsui? Do you have experience in constructing tunnels with ground conditions similar to that of Tai Kok Tsui?  
    TBM tunneling will be adopted in the sections along Yau tsim Mong district. Most of the XRL tunnels will pass through the rock level at Tai Kok Tsui at a reasonable distance between the tunnels and the foundation of the buildings. The tunnel construction and operation will not affect the structural integrity of the buildings nearby.
    A similar example is the Kowloon Southern Link. The tunnel boring machine passed through the foundation of the flyover near Kowloon Park Drive and former Marine Police Headquarters where the tunnel was constructed about 5-6m below ground level.
    The flyover and the former Marine Police Headquarters were not affected by the tunnel construction. During the operation stage, there is no impact to the hotels and the Cultural Centre near the alignment.
  •   Will the XRL tunneling affect or lead to loss of underground water in Ngau Tam Mei? Are there any similar examples of construction to that required in Ngau Tam Mei?  
    The tunnels at the Ngau Tam Mei section will also be constructed by TBMs. During tunnel construction, the excavated face will be supported by a shield near the front of TBMs while permanent precast segmental tunnel linings (walls) will be installed immediately behing the cutterhead of the TBM. This will ensure the excavated surface is always supported and the impermeable tunnel walls will not lead to loss of ground and underground water.
    The Environmental Impact Assessment Report indicates that the construction of the Express Rail Link, including the works of tunnels and ventilation facilities, will not have any adverse impact on the groundwater in Ngau Tam Mei.
    Monitoring points have been set up near the tunnel alignment, including nine existing wells in the Ngau Tam Mei area, which will provide a representative picture of the overall situation of groundwater in Ngau Tam Mei. This will reassure the public that the only noticeable effect is minimal or negligible. Nevertheless, an additional 12 existing wells have also been put on the monitoring list to ease concerns.
    Building the tunnels at Long Valley of the Lok Ma Chau Spur Line would be similar to the situation in Ngau Tam Mei. The tunnels in Long Valley are at least eight metres below ground level where the tunneling method did not have any impact on the underground water nor to the ecology on the surface.
  •   What do you know about “Jambo” of the XRL team?  
    The Swedish-made DT820-AC "Jumbo", weighing 27 tonnes, is a powerful two boom electro-hydraulic drilling rig for rock tunnelling. On 6 July 2010, "Jumbo" arrived at the Shek Yam construction site in Cheung Wing Road, Tsuen Wan for the construction of part of the XRL's 26km of tunnels.
    The multi-boom "Jumbo" equipped with computerised and pre-programmable facilities is being utilized for blast hole drilling on the rock face. Once the blast hole drilling is complete, the holes will be charged with explosives and detonated by shot-firers.
  •   Will drill and blast operations affect the daily activities of the public?  
    With appropriate safety measures controlling the blasting works, the Corporation and the contractors are confident that the daily activities of the public will not be affected.
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