Services
- Concrete repairs
- Retrofit design
- Structural Strengthening, Upgrades & Seismic Retrofits
- Post-Tensioning system
- Corrosion Control
- Moisture control & Waterproofing
- Masonry structure retrofit
- Building Facade & Envelopes Repair and restoration
- Bearing, Structural Joint Maintenance
- Structural Steel Fabrication
- Selective Demolition
- Pre and Post repair NDT Tests
Structural Strengthening, Upgrades & Seismic Retrofits
GPR Scanning
GPR Scanning
For some of the old infrastructure around us many a times as build drawings are not available, on some sites actual steel provided details needs to be cross verified for missing reinforcement if any or at times exact locations of rebars in concrete are specifically required to implement repair systems recommended. For this sanrachana maintains and provides Ground Penetrating Radar – GPR scanner services and Ferro scan system equipment’s. They easily scan the RCC element from over the surface and determines location and sizes of rebars to a depth of up to 300 mm; moreover the output of those is readily available on site after scans in top view, section view or 3-D form for analysis; thereby providing for vital design inputs and to decide on further course of action for strengthening and retrofitting system. This helps during structural modification also to decide exact location for core and cuts required to be taken in the structure for any service requirements.
Epoxy injection
Epoxy injection
Cracks are traced and opened in v groove manner, cleaned and sealed with epoxy putty and grouting nozzles non return type are fixed at specified intervals which later are injected with epoxy grout under pressure till rejection.
FRP Composite System – PT and Non-PT
FRP Composite System – PT and Non-PT
FRP Composites
FRP Systems are used to enhances structural capacity of members in shear, flexure, compression, to aid in blast mitigation, upgrades for seismic loads and to controls propagation of existing cracks.
Application of FRP Systems is mainly
- Fiber wrapping
- Near surface Reinforcement
- Pultruded FRP plate bonding
- Specially designed sections
Sanrachana designs retrofit systems and provides application solutions with Glass, Glass Aramid composite and High strength carbon fabric systems woven in uni direction, bi direction and diagonal pattern with density ranging up to 1200 GSM with wet layup system.
FRP Laminate Systems (PT and Non PT)
CFRP high strength composite Laminates are applied in grooves or on surface of RCC elements with structural grade epoxy adhesive system.
These laminates can be applied in two forms either with prestressing or non prestressed normal application.
Sanrachana has effectively installed pultruded laminate systems with thicknesses of up to 4.2 mm. We also install high strength CFRP/ GFRP rod systems of diameter up to 12 mm which are either fixed in drill holes or in grooves filled with epoxy adhesives.
FRCM
FRCM
Fiber-mesh Reinforced cementitious mortar (FRCM) system involves a specially treated fiber mesh sandwiched in between a special grade high strength inorganic repair mortar.
Sanrachana has trained applicators to apply FRCM layups in layers of about 6 to 8 mm thickness each over damaged structural elements. The High strength, light weight and non corrosive FRCM system results in long lasting repairs. This is a durable alternative to the GI mesh based guniting system which used to degrade easily due to corrosion.
Sectional enlargement & overlays with RCC
Sectional enlargement & overlays with RCC
Sectional Enlargement : RCC Jacketing of Columns
Sanrachana also works with conventional way of increasing the structural capacity by increasing the effective cross sectional area of RCC members. New additional reinforcement is provided along with shear connectors at specific intervals and a RCC jacket is casted around existing member with shuttering as usual. At times concrete is pumped or poured through cores cut in slab; same process as for columns albeit with different RCC detailing applied for each beams, slabs, column capitals, over lays, etc as per deficiency and design. It is important to prepare surface profile depending of overlay thickness; we use special profiles to ensure the same.
Sectional Enlargement : RCC Jacketing of Columns capital
Above column capital casting shows holes drilled for additional rebar anchoring; these are carefully made in slab without damaging existing rebars and tendons; existing steel is mapped with Ground penetrating radar based scanners before core cutting and drilling; rebar anchoring done with epoxy injection grouts and high strength micro concrete mix with 8 mm down aggregates is poured in shutter through core cuts made in slab.
Sectional Enlargement : Epoxy chemical anchor and overlay for RCC Slab
Epoxy based chemical anchoring system are effective solution for transfer of stresses and load; sanrachana designs and implements these services by using products of leading manufacturers with inhouse equipment’s required drilling and coring with dust suction attachments, electronic dispensers, GPR scanners, etc for speedy and effective implementation of jacketing systems.
External Post- tensioning
External Post- tensioning
External Post tensioning Systems installed on RCC Girders and Slabs. PT can be done with both FRP and Convensional system
Micro reinforced Jacketing
Micro reinforced Jacketing
Sections enlargement or reinstatement involving thickness ranging from 40 to 100 mm thick ness is generally done with high strength self levelling and compacting micro concrete mixes. Reinforcement is provided in form of regular rebar cage, hard wire stainless steel mesh or metallic fibres dispersed in microconcrete mix. Shear keys are provided as usual for effective transfer of load.
Special metal alloy strengthening
Special metal alloy strengthening
Sanrachana designs and installs Special high strength metal alloy near surface reinforcements
Plates of strength of up to 600 Mpa and in lengths of up to 12 mtr and varying widths are installed as per site requirements. Enough stocks are maintained all round the year to cater for client’s immediate requirements
Seismic Retrofits
Seismic Retrofits
Sanrachana designs and implements seismic retrofit solutions for structures using various retrofit systems either individually or in combination with each other. These involves FRP systems, Structural steel, conventional jacketing, FRCM, etc. The above image shows column beam junction retrofitted for seismic load using FRP composites.
Seismic retrofitting of Masonry Buildings
The image shows here are of a masonry hospital building being applied with FRP Bands for seismic retrofitting.