#Bar bending schedule sample code#
The shape code 20(As per British code) or 3A (IS: 2502-1963) means that it is a straight bar. For example shape code 20 and shape code 37 (As per British code) or as per the equivalent IS code respectively is shown below. This bar mark is the identifier for the bar in the BBS. Every bar is also marked with a number called ‘bar mark’ (Exambles-1, 2, 8 etc). As more details are put in the drawing it is ideal to show top and bottom bar separately in the drawings. BAR BENDING AND SCHEDULING (BBS) Part drawing of slab bottom reinforcement details is shown below. Let us go through the different aspects of the preparation of BBS. As the steel can be cut and can be brought to the site in a ready made form, Author would like to call it ready mix steel as like our favorite ready mix concrete.
This schedule can be used to cut and bend the bars to the required shape in a cut and bend factory and also in a site. This is called bar bending schedule system (BBS). So details of every bar can be seen in the schedule. A schedule is prepared with all types of bars counted and sorted. Every bar is marked with different number, at the same time providing the same number for the same type of bars. This accuracy gives us, what you see is what you get format (WYS WYG), or in other words photolike drawings of the reinforcement layout. It is sad to know that every builder is loosing this amount in most of his projects. Thus 1 lakh square feet structure shop drawing preparation can save you about Rs 80 lakh. The cost of a rebar shop drawing productionĬan be in the range of Rs 3.5 to Rs 5 per square feet considering the quality standards maintained, whereas the advantages can be Rs 80- Rs 100/- as shown below. Here rebars are drawn to 5mm accuracy as per the detailing rules in IS or British codes. Let us focus on the detailed drawing to be done for reinforcement detailing (rebar) in reinforced cement concrete construction. Proper scheduling, & bending with a mechanized system ensures this required quality level. Also there are rebending considerations to be followed. Fe 500 bars cannot be bend acutely as we bend the Fe 415 bars. In order to prepare the bar bending schedule, the design office can have the information from site about the stock lists for bar diameters and their lengths available at the site. In the use of high grade concrete and steel, quality plays a major role. So these schedules are to be prepared by the engineers in the design office only. The fact is that the site engineers or the supervisors are not fully aware of all the design considerations that was made for the project, regarding the anchoring, curtailment and lapping of reinforcement bars and their positions, particularly in respect of ductile detailing for earthquake-resistant structures. Also proper cutting of bars is not done which results in cutting wastage. Due to lack of quality supervisors and unskilled labours in the site, our quality control in bar bending and laying is not up to the standard.
In the present construction industry, the preparation of the bar bending schedule for the reinforcement work is by site engineers or the supervisors which is being done in India is becoming a bad practice. Unlike the practice of doing reinforcement cutting and bending in a separate workshop, as in UK and USA, based on the bar bending schedule prepared by engineers in the design office, the practice in India has been doing reinforcement cutting and bending at the site only which is based on the bar bending schedule prepared at site by site engineers or supervisors. Reinforcement detail drawing & Preparation of bar bending schedule - Necessity for every builder Reji Zachariah., B.Tech, M.B.A., M.S Chief Executive S&R Consultants, Kochi, Kerala, India, (Mobile 0091 98460 26162, Email: ) INTRODUCTION Preparation of highly detailed reinforcement drawing and bar bending schedule is an essential requirement in the construction field, all over the world except in India!! With this we can achieve a high level of quality control at site and will be advantageous in various aspects of construction.
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