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Preliminary  Drawings

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A  complete  set  of  project  drawings  consists  of general  drawings,  detail  drawings,  assembly  drawings, and   always   a   bill   of   materials. GENERAL DRAWINGS consist of “plans” (views from above) and elevations  (side  or  front  views)  drawn  on  a  relatively small  defined  scale,  such  as  1/8  in.  =  1  ft  or 1/4 in. =  1 ft. Most of the general drawings are drawn in  orthographic  projections,  though  sometimes  details may be shown in isometric or cavalier projections. A DETAIL DRAWING shows a particular item on a larger scale than that of the general drawing in which the item appears, or it may show an item too small to appear at all  on  a  general  drawing.  An  ASSEMBLY  DRAWING is either an exterior or a sectional view of an object showing  the  details  in  the  proper  relationship  to  one another. Usually, assembly drawings are drawn to a smaller scale than are detail drawings. This procedure provides a check on the accuracy of the design and detail  drawings  and  often  discloses  errors. Depending  on  the  space  available  on  the  drafting sheet, you may incorporate the BILL OF MATERIALS in the drawing; otherwise, you are to list it on a separate sheet.  The  bill  of  materials  contains  a  list  of  the quantities,  types,  sizes,  and  units  of  the  materials required  to  construct  the  object  presented  in  the drawing. In  a  typical  military  construction,  working  (project) drawings  go  through  stages  of  review  and  evaluation f o r    d e s i g n    a n d    t e c h n i c a l    a d e q u a c y    by NAVFACENGCOM   to   ensure   good   quality, consistency,  and  cost  effectiveness  of  the  design. Special terms discussed in the following paragraphs describe  these  stages,  from  the  initial  development  of the project to the final phase of construction. Preliminary  Drawings PRELIMINARY DRAWINGS are the initial plans for projects prepared by the designer or architects and engineers  (A/E)  firm  during  the  early  planning  or promotional  stage  of  the  building  development.  They provide  a  means  of  communication  between  the designer and the user (customer). These drawings are NOT intended to be used for construction, but they are used for exploring design concepts, material selection, preliminary cost estimates, approval by the customer, and a basis for the preparation of finished working drawings. You  will  notice  that  most  of  the  design  work incorporated  into  the  preliminary  drawings  at  the 35-percent stage of completion contain, as a minimum, the  following  information:  site  plans,  architectural floor  plans,  elevations,  building  sections,  preliminary finish  schedule  and  furniture  layouts,  interior  and exterior  mechanical  and  electrical  data,  and  civil  and structural  details.  All  of  the  preliminary  project drawings  scheduled  for  use  by  the  SEABEEs  are reviewed by the COMCBPAC or COMCBLANT, as appropriate,  for  construction  methods  or  procedures, whereas preliminary contract drawings are reviewed by ROICC. Final  Drawings FINAL  DRAWINGS  are  100  percent  complete, signed  by  the  contracting  officer,  and  used  forbidding purposes. This set of plans becomes official contract drawings  once  the  contract  is  awarded.  Final  drawings are often revised to show changes made by a scope change or by a change order with the concurrence of both the contractor and contracting officer. At this stage of  completion,  no  further  functional  input  may  be introduced into the final drawings because of time constraints.  In  general,  final  drawings,  together  with project specifications, cost estimates, and all of the calculations,  comprise  the  final  stages  of  design requirements. Red-lined  Drawings These  are  the  official  contract  drawings  that  you will  mark  up  during  construction  to  show  as-built conditions. RED-LINED DRAWINGS are marked in color “red” to indicate either a minor design change or a field adjustment. As-built  Drawings These are the original contract drawings (or sepia copies) that you will change to show the AS-BUILT conditions   from   the   red-lined   drawings.   Upon completion  of  facilities,  the  construction  contractor  or the  military  construction  force  (NMCB)  is  required  to provide  the  ROICC  with  as-built  drawings  indicating construction  deviations  from  the  contract  drawings.  All of the as-built marked-up prints must reflect exact as-built conditions and show all features of the project as  constructed.  After  completion  of  the  project,  as-built marked-up prints are transmitted by the ROICC to the engineering  field  division  (EFD). Record  Drawings The  original  contract  drawings,  corrected according  to  the  marked  prints,  provide  a  permanent record of as-built conditions upon completion of the instruction  work  on  a  project.  The  original  RECORD DRAWINGS may be retained in the custody of the EFD or they may be transferred to stations with public works. 10-2



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