Repair and Rehabilitation of Dumariaghat Bridge OLD over Gandak River on NH - 27 in the state of Bihar (2nd Call).

Survey and Investigation of the bridge as per IRC SP 40 such as carrying out distress mapping, NDT compraising of UPV test, Rebound hammer test, Half cell potential, carbonation test, Core test complete in all the spans

Replacement (removal) of damaged MS railings

Tubular Steel Railing on precast RCC Post, 1.2m high above GL : Providing, fencing,erecting 50mm dia Painted steel pipe railing in 3 rows on precast M20 grade RCC vertical post 1.8m high(1.2m above GL) with 3 holes 50mm dia for pipe, fixed 2m centre to centre, complete as per approved drawing

Removal of existing asphaltic wearing coat comprising of 50 mm thick asphaltic concrete laid over 12 mm thick mastic asphalt including disposal with all lifts and lead upto 1000 m.

Providing and applying tackcoat with bitumen emulsion using emulsion pressure distributor at the rate of 0.30kg per Sqm on the cement concrete deck/pavement - For Mastic and BC

Providing and laying 12 mm thick mastic asphalt wearing course on top of deckslab excluding prime coat with paving grade bitumen meeting the requirements given in Table 500-39, prepared by using mastic cooker and laid to required level and slope after cleaning the surface, including providing antiskid surface with bitumen precoated fine grained hard stone chipping of 9.5 mm nominal size at the rate of 0.005cum per 10 sqm and at an approximate spacing of 10 cm center to center in both directions, pressed into surface when the temperature of surfaces not less than 100 deg. C, protruding 1 mm to 4 mm over mastic surface, all complete as per clause 516. - Excluding Tack Coat

Providing and laying Bituminous concrete of 50mm avg thickness with Higher capacity batch type hot mix plant with Bitumen 5.4% of mix and filler, transporting to site, laying, compacting, finishing, etc., complete as per specification of MORT&H no. 507 - without Tack coat

Providing and laying of a strip seal expansion joint catering to maximum horizontal movement upto 70 mm, complete as per approved drawings and standard specifications to be installed by the manufacturer/supplier or their authorised representative ensuring compliance to the manufacturer's instructions for installation.

Replacement of expansion joints complete as per drawings - Old Removal & Concreting with M30 Grade

Providing and Applying CFRP laminate 100 mm wide and 5.0 mm thick with compatible structural adhesive including,Surface preparation, Grinding the concrete surface, cleaning it with wire brush removing oil etc. and applying compatible primer on prepared surface, Filling the holes and unevensurface with thixotropic putty, applying compatible structural adhesive, pasting the laminate on desired area by using tamping roller to avoid any air voids etc. complete.

Providing and laying CFRP Wrapping system with 230/600 carbon fiber with moduls of elasticity of 230 KN/mm2 GSM UD Carbon fibre sheet,comprising of fibre sheet and compatible epoxy saturant, by dry layup system including surface preparation: grinding, moulding concrete subtrate, cleaning it with wire brush removing oil, laitance if present,rounding sharp edges to min 25 mm radious etc. complete. profiling: Applying compatible primer on prepared subtrate, filling the holes and uneven surface with thixotropic putty etc. complete wrapping the fibre sheet to structural element at desired location using tamping roller to avoid any air voids etc. Repeat the same procedure for multiple layer with the interval of 8 hrs. Sand pasting applying secondcoat of saturant, rectify air voids if any paste the river sand on it to make surface rough to take any further finished ( Mode of measurement : application of fibre area not surface area, if applied in multiple layers each layer has treated seperately, laping of fibre also to be included seperately).

Providing and Applying NonPre-stress Anchor Plate 150 mm x 120 mm x10 mm thick for ends of CFRP LAMINATE at both end of strip laminate

Drilling & Fixing of Carbon Anchor using Epoxy 50mm X 55mm system and spreading the anchor fibres in star pattern including application of saturant etc. Complete.

Applying pre-packed cement based polymer mortar of strength 45 Mpa at 28 days for replacement of spalled concrete - Chipping removal of spalled concrete not included

Crack Stitching: Structural Strengthening with Carbodur Rod & Epoxy Adhesive -Supply and apply a pultruded CFRP Rod for structural strengthening of RCC by creating groove and filling and fixing with Sika CarboDur BC-10 having properties of E-modulus: 1.48x105 N/mm2; tensile strength >=2900 N/mm2. Product requirements: approved by Fib, technical report, bulletin 14; Glass Transition Temp > 100oC. Along with supply and apply a solvent-free, epoxy based, thixotropic, structural two part adhesive for fixing rod with Sikadur-30 LP (IN) having properties of Compressive Strength >90 N/mm2 (7 days) according to ASTM C579; Shear Strength >10 N/mm2 (7 days at 250C) according to FIP 5.15; Bond Strength >= 2.5 N/mm2 according to EN1542. Including Surface Preparation by creating groove of size 15mmx15mm cutting of concrete surface by electrically operated diamond cup wheel cutter and cleaning it properly as per direction and satisfaction of Engineer-in-charge. Epoxy and CFRP Rod shall be supplied by single manufacturer

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per technical Specifications including subsequent cutting/removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy

Sealing of cracks/porous concrete by injection process through nipples/Grouting complete as per Technical Specification. - Cement Grout

Preparing the cracks by making 20mm×20mm V-groove and filling it with epoxy mortar with flexural strength 20 Mpa in 7 days & Tensile strength 10 Mpa in 7 day as per technical specifications clause A-9.

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per technical Specifications including subsequent cutting/removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy

Sealing of crack / porous concrete with Epoxy Grout by injection through nipples complete as per MORTH Specification clause 2803.

Scaffolding for Superstructure as per design approved by the Engineer (hanging platform / Scafflocks)

Supplying, fitting and placing HYSD bar reinforcement in super-structure complete as per drawing and technical specifications - bearing Pedestal

Supply and apply a ready to use non shrink, cementitious free flow micro- concrete with flexural strength 7.5 MPa in 28 days, Tensile strength 3.5 mpa in 28 days & compressive strength 60 mpa in 28 days. Product: with aggregate ratio as per manufacturer recomentaion. - Bearing Pedestal

Providing and applying 300 m DFT anticarbonation coating with 300 % elongation capacity 1.5 mpa pull off strength as per ASTM D 7234 & tensile strength of 1 mpa as per ASTM D 2370 of deck of whole bridge, work inculding cleaning of surface, it should be dry and free from contamination such as oil, grease loose partical etc, applying primer on dry surface. All primed substrates treated with two coated anticarbonation coating complete as per Technincal Specifications clause A-4

Carrying out bridge load test/rating of super structure as directed including all necessary materials, plant equipments, instruments, labour & arrangements for test as required as per IRC:SP:51 & IRC:SP:37. Spans shall be as directed by the Engineer

Lifting of single or Multiple girders for the purpose of removal / realignment, re-fixing of existing bearings / fixing of new bearings including all hire charges and running expenses, transportation charges of all plants, jacks, power pack machines and required equipments, required technicians, labour, etc.,

Supplying, fitting and fixing in position true to line and level POT-PTFE bearing consisting of a metal piston saupported by a disc or unreinforced elastomer confined within a metal cylinder, sealing rings, dust seals, PTFE surface sliding against stainless steel mating surface, complete assembly to be of cast steel /fabricated structural steel, metal and elastomer elements to be as per IRC:83 Part (i) & (ii) respectively and other parts conforming to BS:5400 section 9.1 & 9.2 and clause 2006 of Mort&h specification complete as per drawing and approved technical specificatons (350 MT considered - per bearing)

Supplying , fitting and fixing in position true to line and level elastomeric bearing conforming to IRC:83 (Part-II) section IX and clause 2005 of Mort&H specification complete including all accessories as per drawing and technical specifications (Abutment span)

Vibrating Wire Strain Sensors Strain sensors with Standard +/- 3000 µε, Resolution 1.0 µε, accuracy - ±0.5% F.S, active gauge length 153 mm, temperature range −20 °C to +200 °C, sampling rate 1 reading/minute, connected to wireless transmitter with in-built lithium-ion rechargeable batteries that works without replacement for a period of atleast 3 years and performs wireless data transmission to gateway.

Bearing Deflection Sensor Deflection sensors, with min stroke length 100 mm, powered by external node, with power rating- 0.5W, tolerance ±0.5%, Stopper strength - Approx. 90N (9kgf), connected to wireless transmitter with in-built lithium ion rechargable batteries that works without replacement for a period of atleast 3 years and performs wireless data transmission to gateway.

Pier Settlement Sensor 2 Dimensional (3D), Wireless miniature type electrolytic inclinometers with complimentary temperature recording and alert management system, installation type- self-adhesive, data transmission through - RF signals and charged using re-usable type lithium-ion batteries, with wireless transmission range of 1.0KM free space and battery life of more than 10 years, operating temperature range: -40 to +65°C

3D Accelerometers3 Dimensional accelerometers with 4µg resolution, Range ±2g, Automatic Sampling, 1024 samples per event, with complimentary temperature recording and alert management system, installation type- self-adhesive, or flange mounted, data transmission through - RF signals and charged using re-usable type lithium-ion batteries, with wireless transmission range of 1.0KM free space and battery life of more than 10 years, operating temperature range: -40 to +65°C

CablesRodent proof, three layer Robust and reliable Bus cables for power, data, and synchronization

Logging System Energy efficient, wireless, solar powered logger system with Wireless transmission to cloud through Wi-Fi or Cellular network with IP65 enclosure and above.

Temporary Platform Providing and erecting shock resisting platform and Scaffolding including all cross bracings to make it strong and sturdy for accessing location of sensor or appropriate installation of the BHMS

Installation and calibration of sensors at site.

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