this case study here
Transcription
this case study here
SURVEYING ALL OF MANCHESTER CATHEDRAL IN JUST FOUR DAYS LASER SCANNING HELPS PRESERVE HISTORIC CATHEDRAL AND INSTALLATION OF NEW ORGAN. CHALLENGE Manchester Cathedral was built in 1215, but has Saxon elements from previous buildings that are dated to around 700 AD. The Bishop of Manchester has commissioned a major refurbishment of the entire cathedral to both improve the facilities, such as hidden underground heating, and to preserve the building. As part of these works and crucial to the design was the manufacture of a new organ to be installed in 2016. With no accurate drawings or dimensions of this very complicated building, detailed survey information was required of the structure. As disturbances to the day to day activities of the cathedral need to be minimised, the survey information would allow the installation of the organ to be planned prior to any works commencing. Key Challenges: • Heritage building with ornate Hand-crafted features • Building not plumb or square • No existing drawings or dimensions 01 Roof Level 8950 • High accuracy required 1 00 Ground Floor Section 3 2 1 : 50 3D View 1 Hobs Reprographics plc 35 Dale Street Manchester M1 2HF 0161023709566 01612379575 e-mail Hobs Reprographics plc 35 Dale Street Manchester M1 2HF 0161023709566 01612379575 e-mail PROJECT Manchester Cathedral Basic www.hobsrepro.com CODE STATUS SUITABILITY DESCRIPTION PURPOSE OF ISSUE SHEET CLIENT Hobs Studio Date Project number Drawn by DRWAING NUMBER 12/07/2014 Unnamed OT Checked by Checker 072014 A101 Scale (@ A3) 1 : 50 REV 12/07/2014 14:44:19 0 SOLUTION Hobs were commissioned by Nikal to undertake a full 3D Laser Scanning survey of the Cathedral. The scope of works included the full exteriors and interiors of the main cathedral structure with special attention paid to the areas around the old organ. Hobs spent just four days on site, 3D laser scanning the entire building. The Laser Scanning was scheduled around the cathedral services, including the Chetham’s school of music leavers mass. During these times, scans of alternative areas and the externals were completed. The 3D Laser Scan was completed in high resolution, and accompanied by photographs to create a point-cloud in full colour. The point cloud will be used as a 3D record of the existing state of the building, and can be used to take measurements from around the building. Most importantly, the point cloud was then traced in the 3D software Revit, to create a 3D model of the building. This Revit Model can be quickly create any plans or elevations required. This tracing process was completed manually and needed a huge amount of modelling as each part of the building was slightly bespoke. THE RESULT The cathedral was in operation throughout the process and the laser scanning caused negligible impact. Hobs delivered an accurate Revit model of the area around the organ as well as plans sections and elevations for the area. From the model the architects could determine areas where walls ran out of true and visualise relationships between the complicated archways and wooden detailing for the choir seating. The Revit model was sent to the manufacturers of the new organ; as it contains all the dimensions and nuances of the cathedral. Being far more accurate than any other survey has meant the manufacturers do not have to repeatedly attend the site. Mark Hopkins, Nikal Director commented: “The information Hobs have provided has provided crucial information for planning works in such a sensitive site. The 3D point cloud allows even those without engineering experience to understand the complexities of working in a building of this nature. I am confident that the point cloud data and drawings produced can provide return on investment for many years to come in a whole array of projects within the cathedral” FOR MORE CASE STUDIES, PHOTOS AND INFORMATION: www.hobsstudio.com @HobsStudio www.HobsRepro.com @Hobsrepro LONDON OFFICE 144 Central Office London EC1V 8AX Phone: 0207 014 1361 Email: [email protected] MANCHESTER OFFICE 35 Dale Street Manchester M1 2HF Phone: 0161 237 9566 Email: [email protected]