Friday, July 16, 2021

Steel Reinforcement- Standard Operating Procedures

REINFORCEMENT

Introduction:

This standard operating procedure enumerates the scope of Reinforcement Work to be executed in Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.

Responsibility:

The respective Tower-in-charge is responsible to execute the work as per work procedure.

Safety & protection:

Ensure the workers use safety appliances like safety belts at height, helmets, safety goggles, safety shoes etc.

Ensure the working area is kept clean for easy access and formwork materials are being stacked correctly.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 
Preparatory Works:

All reinforcement work shall be executed in conformity with the drawings supplied and instructions given by the Tower-in-charge and shall be generally be carried out in accordance with relevant Indian standard specifications (IS 2502).

While transporting, care will be taken for ensuring that the bars do not suffer any damage and are safely handled. HYSD bars will be properly stacked and identification and traceability should be properly ensured in the places of work and any further checks as desired could be ensured there. 

Do prepare bar bending schedule before cutting any bars.

Work Method: 

Bending & Cutting:

The Contractor shall be responsible for preparing, checking all bar bending schedules against the drawing and obtain approval from the Tower-in-charge before cutting and bending and prior to fixing of steel.

Neither the size nor the length of a bar shall be less than the size or length shown in the drawings

The dimension of bends shall be so given that a minimum amount of calculation is necessary for marking of bars. The dimensioning procedure shall be used as per drawings and in absence of dimension on drawings, IS: 2502 shall be referred for bending. Dimensions shown in the bar bending schedule shall be checked before cutting the bars.

Bending of bars shall be done in cold conditions only and no heating is permitted on bars. Load shall be applied gradually. Bar once bent shall not be reworked for modification without the approval of the Tower-in-charge.

Bars having cracks or splits on the bends shall be rejected.

After bending of bars, they shall be properly tagged according to drawing number and bar mark for easy identification.

Spacing, Fixing and Cleaning:
All reinforcement shall when fixed in position and at the time of concreting be clean and free from mud, oil, mortar droppings, loose rust, paint, oil, grease, or other deleterious matter. 
All reinforcement shall be placed and maintained in the positions shown on the drawings.

All cover blocks shall be either of PVC or of concrete or of cement mortar of the same strength as that of the surrounding concrete. Proper size of cover block shall be provided at the time of fixing of rebars.
18 swg wire shall be used as binding wire. All bars crossing one another shall be bound with this wire twisted tight to make the skeleton on network rigid.

The free ends of binding wire shall be bent back inwards

Laps in reinforcement shall be provided as indicated on the drawings. Laps shall be staggered as far as practicable for different bars and located at points along the span where neither shear nor bending moment is maximum and as directed by the Structural Consultant.

At one place do not lap more than 50 % of bars. 
As and when necessary welded laps shall be provided as specified by the Tower-in-charge, and shall be in accordance with IS code 2571 requirements.
Important Notes:

Ensure ring hooks are bent at 1350 after fixing of reinforcement in place.

After fixing reinforcement in place do not allow contractor for doing re-oiling on shutter.

Round cover blocks with hole inside should be fixed in rings at the time of reinforcement fixing.

Rebar chair should be fixed on bottom reinforcement of slab only by proper tying its leg with binding wire and do not allow to place rebar chair directly on shuttering.


Team 
CBEC India

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