Information Gathering for precast detailing from consultant drawings

Precast detailing is the process of create detailed drawings of each component in precast. The precast drawing is responsible for extract structural design calculations and Architectural innovative.

Precast detailer utilises Architectural, structural and services drawings to gain a working knowledge of the overall design intent of the building. precast detailers will draw the precast detailed drawing with refer Architectural, structural and services with some technical standard to achievable manufacturing, transport ability and Build ability

So detailer should aware about the information Gathering from consultant drawings to precast detailing

Here we are going to explaining about the thing needed to focus on ARCH GA PLAN for precast detailing

♦ Viewing direction:

1. 1. Viewing direction should be from INSIDE of building (i.e. should not view from Visible side of building) because panel FAR FACE should be at TABLE FACE to get GOOD TABLE finish. Based on Finish purpose and mould similarity we can also view from outside of building
   2. But we need to consider some conditions here
      • Up stand/corbel /crank profiles are quiet difficult to cast in far face so viewing direction need to place based on to match those profile comes at NEAR FACE
   3. Architectural pattern(e.g. Groove, Reckli, Brick snaps etc.) always try to place FAR FACE,

Note: Study all levels before provide viewing direction of panel at bottom level because once direction provided it should not be changed for that elevation until end of that panel.

♦ Finish:

• • NF Finish – Trowel, Semi Trowel, Float, Polished, Broom or Custom
  • FF Finish – Table, Good Table, Reckli, Polished, Retarder, Patterned

1. Mostly we use Trowel and Float finish, Good table
2. Other type of finish used only when clients special requirement
3. Study GA PLAN or WALLS drawings and provide trowel finish at visible area.
4. Refer Arch Elevation for additional finishes and pattern requirements, if any things specified in handover

♦ Inside and Outside:

1. 1. Study GA plan based on general arrangement on plan like bedroom , balcony ,corridor living room , study room , Lift area , stair area etc.
   2. Provide visible places/outside of building as Outside and Non visible places/ inside of building as Inside.
   3. If given OUTSIDE, factory will take additional care for finish.

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♦ Weather proofing:

1. Weather Proofing for a panel provided based on panel locate at below condition
   • Inside / Outside – weathering require
   • Inside / Inside – No weathering require
   • Outside / Outside – No weathering require
2. By considering inside and outside location of panel and arrangement on GA plan provide weathering and return values for panel
3. Provide weathering at window sill level and lintel level.
4. Provide weathering at spandrels if bottom area covered with window

Mainly weather proofing is used to terminate fluid flow into the building

♦ Exposed edge:

1. 1. Study GA plan and provide Exposed edge at visible edge of panels like outside edge of panel, door & window frame openings and top of panel which are visible
   2. Service openings on panel also need to provide exposed edges(Not require for small penetrations)

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♦ Horizontal Groove requirement :

1. 1. For spin-up panels present at visible area of building we need to provide HORIZONTAL GROOVE to match adjacent drop-in panels breakup or some case good visibility purpose.
   2. We need to raise RFI to confirm those groove requirement to follow for that entire project
   3. Edge Groove or Return Groove requires only when FF groove continues and also comes at NF (NF visibility at outside). In these cases NF groove usage need to confirm with Builder.

Study GA plan and provide as per requirement of that panel location.

♦ FSL RL detail:

1. 1. In some projects they clearly specify FSL- FINISH SLAB LEVEL RL in GA plan.

Take that value from GA plan and use it while detailing Overflow, & Lift Door opening.

♦ GT breather face:

1. 1. Breather face provided based on slab access- Should not provide no slab access face
   2. Perpendicular walls/ panels clashes – provide GT extension if clashes with it or else change face if both sides are trowel finish
   3. NF/FF Finish of panel-avoid breather on exposed face(visible face)
   4. Breather must not provide at arch pattern face

Its Easy to manufacture breather face locate at FF/ TABLE FACE

♦ Prop face :

1. 1. Recess for prop provide based on finish for that we need to refer GA plan
   2. Prop face provided based on slab access- Should not provide no slab access face
   3. Perpendicular walls/ panels clashes – change or move prop location if not provide suitable prop type
   4. Check with structural /Arch conc setout to find prop not locate at slab penetration location
   5. Check with PT drawings to find prop not locate at PT stress pan

Its Easy manufacture PROP face locate at FF/ TABLE FACE

♦ Door and window openings:

1. 1. If No Door/ window schedules provide for that project we need to refer location and size of door / window form GA plan and must confirm with Builder.
   2. For height, manually calculate height from CAD elevation file and ask TBC with Builder.

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♦ For extent of arch pattern refer GA plan wherever applicable

Note: – In next session we will focus on Information Gathering from ARCH CONC SETOUT PLAN to precast detailing.it will be post ASAP

Thanks to Ben for supporting me in blogging login & posting, special thanks to Koshy & Venkat for supporting on this document & regulatory me