Retrofitting, Rehabilitation and Crack Repair of Buildings in Kolkata

Many buildings, bridges and industrial structures are still in service long after their design life, or now carry loads they were never designed for. Demolishing and rebuilding them costs a great deal of money and stops their use for a long time. Retrofitting and rehabilitation restore a structure’s strength, and can even increase its capacity, at a fraction of that cost.

BS Projects & Engineers Pvt. Ltd. designs retrofitting and rehabilitation solutions based on test evidence and structural analysis, not guesswork. Since 2002 our focus has been the same: safety first, at the most economical cost.

Building owners, developers, architects and industries in Kolkata, Howrah and North and South 24 Parganas come to us for retrofitting of buildings and crack repair. We first find the cause through testing, then design the repair, from injection grouting of cracks and concrete jacketing to FRP wrapping and strengthening of steel structures.

WhatsApp us  |  Call +91 98304 83074  |  Request a Consultation

Our process: 1. Assess the structure → 2. Test with NDT → 3. Retrofit and rehabilitate

When a Structure Needs Retrofitting

• Strength found deficient in a structural health assessment
• Corroded reinforcement, spalling or cracked concrete
• Steel members with section loss or cracked welds
• Adding floors, heavy machinery, water tanks or rooftop towers
• Change of use of a building
• Damage from earthquake, fire, flood or impact
• Older buildings that need upgrading for current codes, including seismic safety

How We Work

1. Assessment – condition survey and non-destructive testing to measure the present condition.
2. Structural analysis – finding the deficit between present capacity and required capacity.
3. Retrofitting design – choosing the most suitable and economical method, with drawings and specifications.
4. Supervision – technical supervision during execution, if required.

Retrofitting and Repair Methods

Depending on the deficiency, we design solutions such as:

• Concrete jacketing of columns, beams and footings
• Steel jacketing and steel plate bonding
• Fibre reinforced polymer (FRP) wrapping for strength and confinement
• Micro-concrete and polymer-modified mortar repair of damaged concrete
• Injection grouting of cracks and voids
• Corrosion treatment of reinforcement before repair
• Additional members such as new columns, beams or bracing
• Strengthening of steel structures by adding sections, plates or bracing, and repair of welded connections
• Foundation strengthening where the soil or footing is inadequate, supported by our geotechnical investigation and ground improvement expertise

Structures We Work On

High-rise and residential buildings, factory sheds and steel structures, rooftop and ground-based towers, water tanks and reservoirs, sewage and effluent treatment plants, and bridges.

Why BS Projects & Engineers

• Working since 2002 in geotechnical and structural engineering
• Assessment, testing, design and retrofitting under one roof
• In-house soil laboratory
• Solutions focused on safety and economy

Frequently Asked Questions

Is retrofitting cheaper than rebuilding?
In most cases, yes. It also avoids the long period during which a rebuilt structure cannot be used. The assessment tells you which option is more economical for your structure.

Can an existing building take extra floors?
Sometimes. We first check the existing structure and foundation. If the capacity is short, we design the strengthening needed.

Do you test before designing the repair?
Yes. Every retrofitting design starts from a health assessment and NDT results.

How do you repair cracks in a building?
First we find out why the crack formed, through inspection and, where needed, NDT. Depending on the cause, cracks are repaired by injection grouting or with micro-concrete or polymer-modified mortar, and members with structural cracks may also need strengthening such as jacketing or FRP wrapping.

Which areas do you cover for retrofitting?
We are based in Kolkata and take up retrofitting and rehabilitation work in Kolkata, Howrah, North and South 24 Parganas and across West Bengal.

Request a Retrofitting Consultation

Call or WhatsApp +91 98304 83074, email hello@bspepl.com, or fill in our enquiry form.