Chennai Metropolitan Water Supply And Sewerage Board Tender

300 mm dia

at 2.5m depth

at 3.0m depth

at 3.5m depth

Precast circular RCC maintainence holes using sulphate resistant cement by open excavation (From 2.00 m and upto 2.5 m average depth range)

Construction of Precast circular RCC maintainence holes using sulphate resistant cement with M30 design mix concrete including earthwork excavation as per SS20B including timbering and pumping charges(for 2.5m depth and above),Providing Plain Cement Concrete 1:1.5:3 using 20mm B.G. jelly for foundation,supplying and filling sand for bedding, Providing base units of 1m height(base slab and sidewall),riser unit (without corbel) of varying heights to suit the various depth requirements and roof slab including cost of steel reinforcement, cost of fabricating the steel mould using MS sheet and ISA anglesincluding material and labour cost, Providing CI steps,fixing FRC Maintainence hole frame and door,benching and channelling ,refilling with excavated earth and disposal of surplus earth, joining of precast units by grouting with CM1:1 and polyurethane based water proofing compound 1% (by weight of cement ) at shear key and protruded bars- grout holes locations,Cost of conveyance and erection charges of precast maintainence holes at the required position as directed by the engineer at site including testing the Maintainence hole with water for 48 hours to check water tightness and rectifying the defects if anyfor the following sizes and depths.

1.20 m dia at 2.5 m depth

Cast insitu circular RCC machinehole using sulphate resistant cement by sinking method/open excavation depending on site condition (From 3.00 m and above average depth range) machine hole 1.20 m dia

at 3.0 m depth

at 3.5 m depth

Providing Iron Barricading of size 2.50 m width and 1.75 m height using 40x40x4 mm angle for outer frame supports, 25 x 25 x 3 mm angle for inner frame supports and 20 gauge thickness MS sheet for name board (as per drawing) including cutting, welding, fabrication charges and one coat of primer and 2 coats of enamel paint of approved quality, writing "METRO WATER" & work detail/ caution sign, providing necessary interlocking arrangements with adjoining units, fixing danger flags, danger lights, reflectors, fixing stickers etc, including watching during night and placing the barricading units as directed at the sites.

Hire charges for diesel pumpset 3 Hp to 7.5 Hp with fuel and crew charges including transportstion for dewatering.

Cement concrete 1:3:6 using Crushed stone sand (Msand) and 40mm gauge hard broken stone jelly & SRC for plain cement concrete works including laying in layers of not more than 15cm thick including ramming curing, etc., complete

Supplying and filling with stone dust for bedding of DWC pipe Pipes including ramming consolidating etc., complete

Refilling with excavated soils (other than sand) complying with standard specifications for filling in foundations and basement

Disposal of surplus earth

Cutting Pipes

Cutting D.W.C rigid pipes and specials true to axis and finishing the ends complete.(Labour only))

Providing and fixing Dummy including removing after completion pipe laying work etc.

300mm dia

As built survey every sewage and water pipeline and other assetsmust be done using DGPS based RTK method by transferring the coordinates from the nearest static GCP of CMWSSB. The geo reference assets and utilities along with the attributes (as specified by the GIS Wing, CMWSSB)shall be converted into proper geo database (FGDB/PGDB) with the attributes. One set Hard and Soft copy of all the CMWSSB assets and utility has to be prepared category wise network wise in A0 print for verification in a print scale of 1:1000 in A0 plot, with standard legends in international and NUIS standards and should be legible and three sets of final hard copy in A0 print. a.For the undergrond/surface assets along the roads for the distance ranging from: (2KM) = 20000/-