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]