PUMP HOUSE ,AHP ,ASH DYKE SALIENT POINTS ON CIVIL WORK

Fuel oil pump house , pipe trestles etc major portion of the work is structural . The same will be discussed when we will discuss structural portion.

-600mm wide walkway is required along the trestles.

- RCC dyke wall of 1.2m clear height above finished ground level shall be constructed around LDO tank enclosing a minimum area of 17M x 17M.

-Overhead conveyor Gallery  of CHP ( Coal handling Plant) will have maximum span of 25 M.

- Double stream Gallery Should have one central and two side walkways having width of 1100 mm  and  800 mm respectively. For single stream Gallery two walkways having 1100 mm and 800 mm width   should be provided. Gallery should have anti skid chequered plate .

- Sliding PTFE bearing supports shall be provided at one end of the gallery for relieving forces due to temperature variation.

-Transfer Tower /Maintenance Building roof and subsequent floor will be RCC on structure.

-Ash handling plant /system ( for both wet and dry) shall comprises of  bottom ash and fly ash system.

 It also comprises Ash Slurry Pump House , Ash Water Pump House , Ash water Pipe line support to Ash dyke , Ash water re -circulation system  and Ash Dyke. All the civil jobs and structural jobs are

similar to other packages in execution however salient features are given below.

- Top line of Pipeline pedestal shall be 300 mm of FGL.

-The Capacity of the ash dyke shall be suitable for 25yrs of usage.

-Comprehensive seepage analysis to be done. Ash dyke to be deigned taking IS 7894 in to consideration.

- The ash storage area is divided into two storage lagoon and overflow lagoon.

- The water from storage lagoon goes to overflow storage area  through RCC well type structure.

- Embankment - the top width of embankment is to be 6 M and will have 3.75 M width WBM road.

- Free board will be minimum 1.5 M.

- Slide slope shall be minimum 2.5(H) to 1 (V). 3 M wide berms to be provided for all slopes at 6 M

   height interval.  

- 600 mm clay blanket is to be provided at the bottom of all the three lagoons.

- Internal drainage arrangement shall be given .

- Sand chimney of minimum 0.5 M thickness, upto 1.5 M below dyke top.

-Sand blanket of minimum 0.5 M depth

-Height of rock toe should be minimum 1.0 M

-The exit gradient shall not exceed about 0.14.

- When the annual rainfall is more than 200 cm, downstream slopes shall be protected by minimum 30cm thick stone pitching.

-On the upstream slope, stone pitching 30 cm thick shall be provided for the top portion.

  CW PIPES LAYING ERECTION INCLUDING ENCASING UNDER PROGRESS.

LAY OUT PLAN IS VISIBT LE. CHP GALLERY FROM DIFFERENT TRANSFER POINT IS ALSO VISIBLE.

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