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By
Sourav Dutta
Manager-Civil
We generally designate stirrups by its external dimensions. For example, a 250mm x 300mm stirrup has the 250mm and 300mm dimensions in perpendicular directions as shown in Fig 1.
Now a stirrup has 2 bends, types of which are shown in Fig 1 and Fig 4. Guideline of minimum bend length is as per Cl.3.8 of BIS2502 (shown in Fig 3).
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By
Sourav Dutta
Manager-Civil
Brand embossing
On rebar pieces, different items are encrypted in the following manner:
Here, X = Dia of rebar in mm, eg, 20
ABCD = Brand of rebar, eg, TATA TISCON / SAIL / JSPL etc
Y = Yield stress of rebar, eg, 500 indicates Fe500 with yield stress=500 Mpa
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By
Sourav Dutta
Manager-Civil
Design and construction:
The design and construction of formwork should take account of safety and of the surface finish required. The formwork should be sufficiently rigid and tight to prevent loss of grout or mortar from the fresh concrete, during its placing and construction.
Formwork and its supports should maintain their correct position and be to correct shape and profile so that the final concrete structure is within the limits of the dimensional tolerances specified. They should be designed to withstand the worst combination of self-weight, reinforcement weight, wet concrete weight, concrete pressure, and construction and wind loads, together with all incidental dynamic effects caused by placing, vibrating and compacting the concrete.
By
Sourav Dutta
Manager-Civil
Common Hazards/issues normally countered at all construction sites:
Human error in rebar fabrication (manual).
Fig 1 : Incorrect bend
Compromise with safety and quality.
Fig 2 : Safety and Quality issues upon using rebar cutter
Procurement schedule delays affecting site progress, and thereby delaying project completion.
Inventory management. Capital locked in inventory.
Fig 3 : Lack of space at site affects storage/procurement
Rebar pilferage.
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By
Sourav Dutta
Manager-Civil
The first version of BIS 1786 came out in 1985 when in Cl.5.1, the code suggested the nominal sizes as shown below:
Fig 1 (s) : BIS1786-1985 and the relevant clause
The next version of the code BIS 1786 was introduced in 2008, where nominal sizes were rationalized and nominal sizes 7 mm, 18 mm, 22 mm, 45 mm and 50 mm had been removed. In Cl. 6.1, the code had suggested the nominal sizes as shown below:
