Marine Structure

Overview

Transmission Tower in Marine Environment, Mumbai

Problem: 

  • RCC foundation of transmission tower line was on Mumbai coastline
  • Alternate drying and wetting of RCC, creating splash zone leading to severe corrosion of steel
  • General repair methods failed due to aggressive condition
  • Required repeated repairs
  • Difficult site to approach – no approach road, electricity & potable water

Solution:

  • Surface preparation by removing all loose materials and coating on RCC surface
  • Steel Treatment: Migratory corrosion inhibitor and protective steel coating
  • Concrete impregnation was carried out by pressure grouting to ensure sealing of all cracks
  • Section reconstruction by polymer modified mortar and micro concrete
  • Fiber wrapping on repaired surface and coating for UV protection.
  • 25 nos. of towers were completed in 15 months and being monitored for last 5 years

Overview

Restoring Infra Of The Nation

Problem:

  • 25-year-old transmission tower has its RCC foundations subjected to alternate wetting and drying in marine waters.
  • Two towers collapsed as corrosion damaged foundation failed, leaving a quarter of Mumbai population without electricity.

Solution:

  • RCC repairs were performed with micro-concrete
  • Cathodic protection with sacrificial anodes and galvanized plates to resist corrosion electrochemically.
  • Carbon fiber wrapping for confinement and integrity of RCC
  • A total of 30 towers were restored on sea and land, and have been performing well for the past 10 years.

Overview

Silchar Medical College Hospital (SMCH)

Problem:

  • The structure was visibly distressed due to ageing
  • Corrosion damage such as spalling and cracking was visible in columns, beams and slabs
  • Rooms in the top floor had leakage and dampness in ceiling, creating threat to sterile environment

Solution:

  • After removal of loose concrete, MCI was applied to protect internal steel.
  • Rust removal and anticorrosion treatment was performed
  • Additional steel was added wherever required
  • Lost sectional area was made up by jacketing in columns and beams
  • Fiber wrapping with SRM G Wrap was done on columns, beams and slabs
  • Terrace level waterproofing coat and screed concrete was applied after removing previous layer and screed
  • External plastering was conducted after touchups and repairs
  • Weather resisting anti-carbonating acrylic based UP protector coat was applied and completed

Overview

STRENGTHENING CANCER THERAPY CENTRE

Problem:

In this prestigious new facility, new storeys were to be built for increasing the capacity.

Diagnosis:

All structural members were found to be in good condition. As per analysis, only columns need to be strengthened. Phase 1 columns could be jacketed whereas Phase 2 columns could not increase in size.

Solution:

  • In phase 1, free-flow micro-concrete jacketing was done after anchoring shear keys and main bars.
  • In phase 2, grooves were made on column, high strength steel plates were anchored on them.
  • Later, surface was levelled with grinding and putty.
  • Carbon fiber wrapping for confinement and strength.

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