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Railway Protection
Control Criteria of Effects on Operating Railway from Adjacent Construction Works
Commuter network comprises Tsuen Wan Line, Kwun Tong Line, Island Line, Tseung Kwan O Line, Tung Chung Line, Airport Express, Disneyland Resort Line, East Rail Line, Tuen Ma Line, South Island Line, High Speed Rail and Light Rail.
Limiting Figures
| Pressure change on any underground structure / installation (P) | - 20 kPa ≤ P ≤ 20 kPa |
|---|---|
| Movement | ≤ 20 mm for a total movement in any railway structures / installations ≤ 1 in 1000 for distortion in any railway structures / installations ≤ 5mm for the induced level difference between rails of a track in perpendicular plane |
| Vibration induced to railway structures | ppv ≤ 15 mm/s (prolonged) ppv ≤ 25 mm/s (blasting) |
| Vibration measured on the overhead power line mast, signalling and telecommunication furniture on at-grade railway structures | ppv ≤ 10mm/s amp. ≤ 80 μm |
Clearance Requirements
| Pile, foundation, borehole/drillhole, well, soil nail, horizontal drain, rock bolt/dowel or other geotechnical installation | ≥ 3m from underground railway structures |
|---|---|
| Piling works adjacent to at-grade railway structures; | ≥ 3m on plan from the railway fence/wall, or 7m on plan from the centreline of the nearest track when there is no railway fence or wall |
| Scaffolding, working platforms, advertising signs or any projections | ≥ 6m on plan from track if erection at a level above the railway tracks |
| Operation of lifting appliance | ≥ 6m on plan from tracks and above ground structures / installations for the arc in which the jib of lifting appliance swings |
| Storage of materials, containers, huts etc. | ≥ 6m on plan from railway structure / track and vent shaft openings |
| Storage of dangerous goods or other inflammable materials | ≥ 6m on plan from railway structure / track |
| Openings of building | ≥ 5m to the opening of any railway vent shaft. This distance may be reduced to 2.5m if the exhaust air from the railway vent shaft is directed away and is not likely to affect the opening by natural convection |
*The control criteria are extracted from PNAP APP-24 and PNRC 14 for reference only.