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TECHNOLOGY
PRE CAST R.C. PLANK FLOORING / ROOFING SYSTEM ELEMENTS OF FLOOR / ROOF •
PRE CAST RCC PLANKS
•
PARTIALLY PRE-CAST R.C.C. JOISTS
1.
PRE CAST R.C.C PLANKS
To provide for Tee beam effect with the joists, the plank is made partly 3cm and partly 6cm thick The length may vary up to maximum of 150 cm. One 30x150 cm plank weighs about 150 Kg. and can be handled manually .
2. PARTIA PARTIALL LLY Y PRE-CA PRE-CAST ST R.C. R.C.C C JOIST JOISTS S It is a square shaped Joist, 15 cm wide and the pre-cast portion is 15cm deep with stirrups projecting out so the over all depth of of the joist with in-situ concrete is 21 cm.It cm.It is designed as composite Tee beam with 6cm flange comprising of 3cm pre-cast and 3 cm in-situ concrete. This section can be adopted up to 4mt. span
3. STRU STRUCT CTUR URAL AL DES DESIG IGN N
The planks planks are designed designed as as simply supported for self weight including including in-situ in-situ concrete in haunches and as continuous slab for live load and dead load of floor finish and waterproofing treatment.
The joist is designed as simply supported tee-beam with 6 cm flange thickness. Reinforcement is provided as per design requirements depending upon the spacing and span of the joist.
The joist can be designed as continuous beam also for intermediate floors only. For spans, more than 2.8 mt the joist at the support is to be designed as doubly reinforced beam which necessitates welding of the bottom reinforcement of adjacent joists at the t he support.
4. SERVICE AREA In service area, pipes, floor trap, WC pan, etc, are provided so the supporting slab is sunk. To take care of the additional load of the filling and also make the floor leak proof 2.5 cm thick M15 concrete is laid over top of the planks in addition to haunch filling.
5.
BALCONY CHAJJA PROJECTIONS
Balcony projections are provided along the partially pre-cast joists. The joist is designed with an over hang carrying capacity for super imposed loads for balc ony in addition to the self load and the load due to railing. Main reinforcement is provided at the top in insitu concrete, the pre-cast portion taking the compression. The free end of the j oist is propped adequately until in-situ concrete attains sufficient strength.
THIN PRE CAST R.C.C LINTELS In a wall with beam and masonry above, the two components components act together in supporting the load. This phenomenon of composite action has been established by many research workers.
FACTORS AFFECTING COMPOSITE ACTION 1. Bond/ Bond/ Frict Friction ion at at the inter interfac face e of lintel lintel and and mason masonry ry 2. Crus Crushi hing ng stre streng ngth th of maso masonr nry y 3. Shea Shearr stre streng ngth th of mason masonry ry 4. Heigh Heightt of of mas mason onry ry abov above e lint lintel el 5. Rein Reinfo forc rcem emen entt in lin linte tell
