PREPARATION OF BBSPREPARATION OF BBS

BBSBBSMark and location of the member.Drawing reference.No of members.Bar type.Bar size.Cutting bar length.No of bars per member.Total no of bars.Total weight of bars.Shape sketch.Remarks if any.

METHODS METHODS

Manual.Software ( BBS& Optimisation)

CAD RC- AMAOR –FranceSteel pac.Informatica –ItalyGo software – Italy.

READING REBAR DRGREADING REBAR DRG

• Read the notes carefully before reading any reinforcement detail.

• All the cross reference drgs to be read before making BBS.

• No lapping allowed for bars beyond 36 mm dia.• In the absence of data like cover, lap length

and development length, hook length, follow the IS 2502-1963 and concurrence from client/consultant.

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

KNOW THE NOTATIONSKNOW THE NOTATIONS

BBS EXAMPLEBBS EXAMPLE

..\EXPLANATION BBS.xls

GENERAL SHAPESGENERAL SHAPES

CRITICAL RADIUSCRITICAL RADIUS

LESS THAN THIS RADII, REQUIRE BARS TO BE BENT TO SHAPE

TIPSTIPSFollow the relevant client approved codes.In absence of the code, follow IS 2502-1963.Code of practice for Bending and fixing bars for Concrete Reinforcement.For complicated shapes –make mockup.Always supply bbs to the workers with small sketches.For lapping two different dia bars, lap length be considered for lower dia.

TIPSTIPSOptimize to use the offcuts and full length bars without wastage.Additional allowance to be taken while using bar couplers.Check the position of laps-which may lead to congestion or problems in placing.Do not forget to add chairs.Do not forget to add spacers.Do not position laps in beam col junctions.Do not position laps in the midspan of the beam.

TIPS TIPS --YARDYARD

• Install template shapes of rings in the yard.

• Periodical checking with the templates by the barbenders.

• Conduct periodical checks for the bar benders.

TIPSTIPS

• The crank shape for the bars greater than 12 dia as per the sketch shown unless noted. The slope shall not be more than 1 in 6.

1 in 6 (max)

EXAMPLE EXERCISEEXAMPLE EXERCISE--REGULARREGULAR

BBS BBS --PREPARATIONPREPARATION

....\\PREPARATION OF PREPARATION OF BBSBBS\\EXPLANATION EXPLANATION BBS.xlsBBS.xls

EXAMPLE EXERCISEEXAMPLE EXERCISE--BAR COUPLERBAR COUPLER

THANK YOUTHANK YOU