Terms and rules for bar bending schedule – Estimation of steel in building construction

Civil engineeringBar bending schedule is a detailed record of listing of support types as well as dimensions, its quantities, form codes, measurements and also marked bar mark numbers with reference to a detailed architectural illustration. The prep work of the BBS is known as organizing. A bar bending routine is normally prepared by a Quantity Surveyor as well as verified by an architectural designer. Bar is a steel product of any type of cross-section or size adapting advised country style code. For British standards BS 4449:2005 or BS 6744 will apply. Nominal size or diameter is the reliable cross-sectional area size of a circle, d of the bar. Typically dimension of bench.

Bar Mark is the determining mark against each one-of-a-kind bar enters a drawing which describes individual entrances on the bar bending schedule. The same number is pointed out in the distribution label. A new number should be utilized if when the cross-section or shape or the length of bend is different. Forming code is a two-digit code which refers to the reinforcement flexing shape. BS666 specifies different shape and also corresponding shape codes. Pitch/Spacing is the centre-to-centre range between 2 nearby bars put in a pattern having same bar mark. Stock lengths are those sizes in which the manufacturer supplies bench. Usually it is readily available in limited variety of sizes of 6 m and 12 m.

Things to be kept in mind while Preparing Bar Bending Schedule

The total length of any bar or textile listed in the routine ought to remain in multiples of 25mm and also the size of individual bends must remain in multiples of 5mm. Depending on the diameter of bar, the code advises a minimal distance of bending. This value for minimum radius r has to be maintained while scheduling. For all shape conference at an angle besides right angle, the dimensions are to be defined by co-ordinates as program in the figure and not in levels of arc/radians. When bars are cranked, example as in two-way piece supports, the general offset measurement, dimension 1 shown in the figure, shall be not less than two times the bar dia. The tilted length, measurement 2 in the number, shall be not less than 10 x d for bars not going beyond 16 mm dia; and 13 x d for bars higher than 16 mm dia. When bars flexes with a shape with two or more bends in the same or opposite directions in very same or various airplane, a minimum straight of 4 x d will be consisted of in BBS in between bent section, as revealed.