D24 Establish and maintain the dimensional control of construction and installation projects
D24.1 Establish and set out dimensional controls
Performance Criteria - this involves being
able to...
(a) obtain available survey information, check that it is
up to date and accurate and resolve any
problems
(b) correlate and interpret information on
construction and installation which is relevant to
the setting-out of the project
(c) identify variations between the specified and the
actual site dimensions, record them accurately
and circulate them to decision makers
(d) identify and select appropriate grid systems to be
used on the project
(e) set out reference markers which are suitably
placed and accurate
(f) set secure reference points which are accurate,
identified clearly and protected from movement or
removal
(g) develop an observation scheme which meets the
specified accuracy criteria
(h) select and maintain measuring and recording
equipment which meets the specified accuracy
criteria
(i) record any setting out information which may be
of later use, and store it securely so that it is
available when needed
The Range...
[1] Problems:
• unclear and missing information;
• inconsistencies between documents;
• errors
[2] Setting out information:
• dimensions;
• locations;
• levels (including inaccuracies and deviations);
• off-site manufacture, on-site assembly;
• required precision and tolerance
[3] Variations:
• boundaries;
• levels;
• locations
[4] Grid systems:
• national grid;
• local grid;
• lower case grid;
• site grid;
• structural grid
[5] Reference markers:
• ground stations;
• base lines;
• benchmarks;
• elevated target positions
[6] Observation scheme:
• graphical;
• measured;
• instrumental
[7] Measuring and recording equipment:
• mechanical;
• optical;
• electronic;
• field book;
• global positioning system
D24 Establish and maintain the dimensional control of construction and installation projects
D24.1 Establish and set out dimensional controls
The Evidence - performance and
process
The Evidence - knowledge and
understanding
Product Evidence:
(1) How do you obtain available survey information and
check that survey information is up to date and
accurate? (application) (a) [1]
(1) Record(s) of checked and correlated survey and
construction and installation information which includes
resolved problems and variations (a,b,c) [1,2]
(2) Record(s) of selected grid systems and setting out
reference markers (d,e,f) [4,5]
(3) Record(s) of setting-out procedures which include
observation scheme, maintained measuring and
recording equipment and setting-out information (g,h,i)
[6,7]
(4) Record(s) of setting out (i) [7]
Process Evidence:
None applicable
(2) How and why do you resolve any problems with survey
information? (synthesis) (a) [1]
(3) How do you record variations between the specified
and the actual site dimensions? (application) (c) [2]
(4) How do you record and store any setting out
information which may be of later use? (application) (i)
[2]
(5) How do you interpret information on construction and
installation relevant to the setting-out of the project?
(analysis) (b) [2]
(6) How and why do you correlate information on
construction and installation relevant to the setting-out
of the project? (synthesis) (b) [2]
(7) What do you identify as variations between the
specified and the actual site dimensions?
(understanding) (c) [3]
(8) Which grid systems do you identify as appropriate to
be used on the project? (understanding) (d) [4]
(9) How and why do you select appropriate grid systems
to be used on the project? (evaluation) (d) [4]
(10) How do you set out reference markers which are
suitably placed and accurate? (application) (e) [5]
(11) How do you set secure reference points which are
accurate, identified clearly and protected from
movement or removal? (application) (f) [5]
(12) How and why do you develop an observation
scheme? (synthesis) (g) [6]
(13) How do you maintain measuring and recording
equipment? (application) (h) [7]
(14) How and why do you select measuring and recording
equipment? (evaluation) (h) [7]