Cbri Technology
-
Upload
joshipra2799 -
Category
Documents
-
view
572 -
download
1
Transcript of Cbri Technology
![Page 1: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/1.jpg)
CBRI TECHNOLOGY
![Page 2: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/2.jpg)
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.
![Page 3: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/3.jpg)
![Page 4: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/4.jpg)
2. PARTIALLY PRE-CAST R.C.C JOISTS
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 the joist with in-situ concrete is 21 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
![Page 5: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/5.jpg)
3. STRUCTURAL DESIGN
The planks are designed as simply supported for self weight including 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 support.
![Page 6: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/6.jpg)
![Page 7: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/7.jpg)
![Page 8: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/8.jpg)
![Page 9: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/9.jpg)
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.
![Page 10: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/10.jpg)
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 balcony in addition to the self load and the load due to railing. Main reinforcement is provided at the top in in-situ concrete, the pre-cast portion taking the compression. The free end of the joist is propped adequately until in-situ concrete attains sufficient strength.
![Page 11: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/11.jpg)
THIN PRE CAST R.C.C LINTELSIn a wall with beam and masonry above, the two 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/ Friction at the interface of lintel and masonry
2. Crushing strength of masonry
3. Shear strength of masonry
4. Height of masonry above lintel
5. Reinforcement in lintel
![Page 12: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/12.jpg)
![Page 13: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/13.jpg)
DETAILS OF THIN PRE-CAST LINTEL WITH CHAJJA
![Page 14: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/14.jpg)
L-PAN ROOFING
![Page 15: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/15.jpg)
![Page 16: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/16.jpg)
L- PAN AND CHANNEL UNIT
![Page 17: Cbri Technology](https://reader033.fdocuments.us/reader033/viewer/2022061119/546b49dcaf795967298b4b5c/html5/thumbnails/17.jpg)