An offshore complex is surveyed and modelled using photogrammetry to ensure modifications achieve a first time fit. Zero re-work was the goal and was readily attained. Project managed by Gerard Hind.
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An offshore as-built project with on-shore checking.
1. M1 COMPLEX
AS-BUILT FROM EXISTING DRAWING
Vs
AS-BUILT FROM PHOTOGRAMMETRY
AND
CONSEQUENCES ON DESIGN AND CLASHES
Report presented to client
By
Gerard Hind Technical Director.
2. AS-BUILT MODEL FROM PHOTOGRAMMETRY HAS BEEN BASED ON THE FOLLOWING
DATUM ALIGNMENT DATA PROVIDED BY CLIENT AS HARD COPY.
M1DR
M1PQ
ELEVATION
DATUM
PLAN DATUM EXTRAPOLATED
EXTRAPOLATED CENTRE LINE
CENTRE LINE LEG HORIZONTAL
MEMBER
EAST 0 MM
UP 10 000 MM
NORTH 0 MM
DATUM DIRECTION
THESE TWO LEGS HAVE BEEN
ALIGNED NORTH
6. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS-
BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY
PHOTOGRAMMETRY CAN BE VISUALISED.
RED = AS-BUILT CLIENT
GREY = AS-BUILT PHOTO
MIDR
7. RED = AS-BUILT CLIENT
GREY = AS-BUILT PHOTO
MODEL ALIGNED ON THESE AREAS
8. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS-
BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY
PHOTOGRAMMETRY CAN BE VISUALISED.
RED = AS-BUILT CLIENT
GREY = AS-BUILT PHOTO M1DR-M1PQ LINK BRIDGE
9. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS-
BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY
PHOTOGRAMMETRY CAN BE VISUALISED.
RED = AS-BUILT CLIENT
GREY = AS-BUILT PHOTO
M1PQ
10. ALL THE PROCEEDING IMAGES ARE BASE ON GLOBAL ALIGNMENT BASE ON :-
M1DR
M1PQ
ELEVATION
DATUM
PLAN DATUM EXTRAPOLATED
EXTRAPOLATED CENTRE LINE
CENTRE LINE LEG HORIZONTAL
MEMBER
EAST 0 MM
UP 10 000 MM
NORTH 0 MM
DATUM DIRECTION
THESE TWO LEGS HAVE BEEN
ALIGNED NORTH
11. HOWEVER
IF A LOCAL ALIGNMENT IS ASSUMED THEN THE
DEFERENCE BETWEEN THE MODELS BECOMES
MUCH MORE LESS – ALTHOUGH PLATFORM-TO-
PLATFORM IS AS SURVEYED IT CAN BE DISPLAYED
ON A LOCAL BASIS.THE CLIENT
AS-BUILT MODEL IS DIMENSIONALLY INCORRECT
17. FOR LOCAL ALIGNMENT OF M1PQ
ALL OF THE PLATFORM REQUIRES
TO BE MOVED AND WILL BE
ALIGNED ON THESE 3 PLACES
M1PQ ALIGNED ON 2 LEGS AND FLOOR CELLAR DECK TOP OF STEEL
19. NOW THAT WE HAVE ALIGNED LOCALLY M1DR – BRIDGE –M1PQ
A SAMPLE OF DESIGN ERRORS CAN BE VIEWED.
20. VIEW SHOWING (WHITE) AS BUILT MODEL (PHOTO) ALIGNED TO CLIENT (BLUE)
DESIGN MODEL AND CLASHES CAN NOW BE EXAMINED.
WHITE – AS-BUILT PHOTO
BLUE – NEW DATA BY CLIENT M1PQ PLATFORM
29. WHITE – AS-BUILT PHOTO
NEW STRUCTURE CLASHES EXISTING BLUE – NEW DATA BY CLIENT
30. TIE-IN ERROR WHITE – AS-BUILT PHOTO
BLUE – NEW DATA BY CLIENT
31. TIE-IN ERROR WHITE – AS-BUILT PHOTO
BLUE – NEW DATA BY CLIENT
32. ALL OF THE CLASHES CAN EASILY BE IDENTIFIED BY:-
ALIGNING THE CLIENT DESIGN MODEL TO THE REAL AS-
BUILT LOCATION AND ORIENTATION OF THE M1PQ
PLATFORM AND THEN USING PDMS CLASH DETECTION
UTILITY TO PROCESS DESIGN DATA.
33. VIEW SHOWING (WHITE) AS BUILT MODEL (PHOTO) ALIGNED TO CLIENT (BLUE)
DESIGN MODEL AND CLASHES CAN NOW BE EXAMINED.
WHITE – AS-BUILT PHOTO
BLUE – NEW DATA BY CLIENT
34. WHITE – AS-BUILT PHOTO
BLUE – NEW DATA BY CLIENT
CLASHES TIE-IN ERROR
45. ALL OF THE CLASHES CAN EASILY BE IDENTIFIED BY:-
ALIGNING THE CLIENT DESIGN MODEL TO THE REAL AS-
BUILT LOCATION AND ORIENTATION OF THE M1DR
PLATFORM AND BRIDGE AND THEN USING PDMS CLASH
DETECTION UTILITY TO PROCESS DESIGN DATA.