Retaining Wall at 1881 Heritage

Site Location : No. 2A Canton Road, Tsim Sha Tsui, Kowloon Agent : Citybase Property Management Ltd. Consultant: Troika Engineering Limited Year of Completion : 2014 Background: The site of the 1881 Heritage around the corner of Canton Road and Salisbury Road was once the Marine Police Headquarters constructed in 1884 with slopes and retaining walls within and along the boundaries of its ground. During the Japanese Occupation period, extensive underground tunnels were constructed beneath the lawn but after World War II, these tunnels were blocked and the lawn was returfed for the safety of public. In the 1970s some slopes of its ground were levelled to make way for the construction of Kowloon Park Drive, thus more retaining walls were formed. Altogether 9 slope features have been registered with the Geotechnical Engineering Office, CEDD in which 3 are cut slopes and 6 are retaining walls. As required by the Geotechnical Engineering Office, CEDD, the condition of the slope feature should be appraised by experienced and qualified registered geotechnical engineer who carries out an inspection to the feature and gives recommendation on necessary improvement works for their maintenance at 5-year intervals. Troika's Works: Visual inspection on the existing condition of the slopes and retaining walls within the Lot by a Registered Professional. Review of available documentary information of the slopes and retaining walls from the Geotechnical Engineering Office and the Buildings Department to identify whether there is any visible change to the slopes and retaining walls. Review of past available slope maintenance record to assess whether a stability assessment and / or other assessment of the slopes / retaining walls has previously been carried out and the adequacy of the routine maintenance works. Re-assessment of the consequence-to-life category of the slopes and retaining walls, as set out in the Geotechnical Manual for Slope and the latest version of the Table promulgated by the Geotechnical Engineering Office. If necessary, advice on the implications of problems that are not explicitly included in the basic maintenance list and recommendation on emergency repair works or detailed investigations. Checks for signs of leakage due to cracks and damage of water discharge services and recommendation of detailed leakage check, regular checks, repair or re-routing of the services, as necessary. Based on the visual inspection and the relevant information obtained, preparation of an Engineer Inspection Report with suggestions on whether any detailed slope stability assessment and/or emergency slope stabilization measures is required. Preparation of a Slope Maintenance Manual including re-assessment of the consequence-to-life category, frequency of routine maintenance inspection and Engineer inspection and list of items for routine maintenance works.