MandR at PCIA. Repairs to Filter Bed No 12 along with allied repairing works at filter house WTP Rawet

1) Removing the existing filter media sand & supporting gravel from the filter bed i.e. any lead & lifts i.e. screening the gravel with appropriate mesh sieve & stacking the media & travel as directed by the Engineer in charge.

2) Dismantling the R.C.C. Work 1:2:4 and sorting out the materials such as steel etc. as directed and stacking them within the specified lead as directed etc. complete.

3) Cleaning & washing of existing v-wire Laterals by using specialized acidic and alkaline chemicals to remove Scale, Sludge and other sedimental particles  from lateral surface.  including all material chemicals, labour etc.

4) Providing V-wire under drain system with V-wire screen made of SS 304 fitted on UPVC base pipe 3.5" dia, V wire screen having screen slot of 350 microns having 16% open area base pipe of laterals 3" dia UPVC SCH40. Tee for main manifold with air distribution is made of UPVC fittings, Air clamp with main header is of UPVC saddle with SS 304 nuts & bolts.

5) Providing and casting in situ C.C. of trap /   granite/   quartzite   /   gneiss   metal   of approved  quality  for  RCC  works  as  per detailed   drawings   and   designs   or   as directed           by      Engineer-in-charge including   normal   dewatering,   centering, form   work,   compaction,   finishing   the formed surfaces with C.M. 1:3 of sufficient minimum  thickness  to give  a smooth  and even   surface   wherever   necessary   or roughening   if   special   finish   is   to   be provided  and  curing,  etc.  complete.  (By weigh batching and mix design for M-250 and  M-300   only.  Use   of   L&T,   A.C.C., Ambuja, Birla Gold, Manikgad, Rajashree, etc. cement is permitted.) (Excluding M.S. or Tor reinforcement)  5.1) Slabs / Landings / Vertical Walls / Waist Slabs / Steps for Staircase 5.1.1) In RCC M-200

6) Drilling holes in existing concrete structure for reinforcement anchoring with the help of HILTY - 500 chemical including locating existing reinforcement with the help of device PS-35 including all labour material machinery transportation charges excluding cost of reinforcement. For 12 mm dia

7) Providing  and  fixing  in  position  steel  bar reinforcement  of  various  diameters  for RCC  piles,  caps,  footings,  foundations, slabs,     beams,     columns,     canopies, staircases, newels, chajjas, lintels, pardies, copings,  fins,  arches, etc.  as per  detailed designs,     drawings     and     schedules; including   cutting,   bending,   hooking   the bars,  binding  with  wires  or  tack  welding and supporting as required, etc. complete (including  cost  of  binding  wire).  (Bd-F- 17/306) 7.1) Corrosion Resistant Steel (Fe 500)

8) Laying of V - wire under drain system including laying & fixing the laterals in position as shown in the drawing. Fixing end cap to one end & 'T' to the other end of the lateral. Fixing separate air header with coupler over the 'T' of the lateral connecting air nipple between 'T' of the lateral and air header with coupler whole assembly arranged as per drawing over the manifold.

9) Supply of Filter media fine quality sand from any source having effective size 0.45 to 0.70 and uniformity coefficient within the limit of 1.3 to 1.7 within premises as per IS:8419 Part-I of 1977 including transpotation, loading, unloading, stacking and for all leads.