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Tuesday 22 January 2013

MAIN CIVIL WORK OF THERMAL POWER PLANT.

E. Switch yard with associated civil foundations.

It has been observed that beside civil and structural work of main plant package there are number of packages (small) in BOPs. Earlier time the equipment supplied by the company ,usually did the civil work associated with it. As a result number of small civil vendors were present at site. These creates number of problems during interface with other package. However now a days big companies or consortium are coming up to resolve the issue. There  may be one company which is handling the project as EPC or some company may supply two or three system. These BOP vendors were mobilised at a later date and found not up to the mark regarding civil work. Generally civil scope is very less for individual package  therefore it does  not attract bigger companies to quote. It is a source of delay for the project. To overcome the difficulties all the civil vendors of BOP should be under the fold of one umbrella . This will help us to reduce the time, cost and can maintain quality. This can only achieve by the insistence of owner to all the bidders quoting for BOPs. Our motto will be to bring competent vendor for the civil work . This will have added advantage also during execution . If there delivery delay in one package in terms of material , drawing and other resources then manpower can be diverte ed to do the job of other package. This will reduce the idle labour problem also to individual equipment supplier. But this type of proposal yet to come in force in our construction field as on date.

It was told earlier that owner will float the civil package tender with all boundary conditions the bidder will carry out all detailed drawing indicating all necessary input and submit to owner/consultant for review and acceptance.

The bidders need to perform following jobs under their scope of work.
"
The work to be performed under this specification consists of design,engineering and providing all labour, materials, consumables, equipment, temporary works, temporary storage sheds, temporary colony for labour and staff, temporary site offices, constructional plants, fuel supply, transportation and all incidental items not shown or specified but reasonably implied or necessary for the completion and proper functioning of the plant, all in strict accordance with the specifications including revisions and amendments thereto as may be required during the execution of work. "

Design Criteria : The design criteria given here will be applicable to all civil and structural work of the plant.

Dead Load : All structural load complete as per IS -875 ( Part- I)


Imposed Load : Imposed loads of different area include live loads , erection ,operation and maintenance loads . Equipment loads which are coming on the floor is not considered. For calculation of Imposed equipment loads are to be added. For reference and Guidance pl. refer IS 875 ( Part -2) Some of the imposed load in critical areas are mentioned below to be considered for design.

SERIAL NO.                                       LOCATION                                       IMPOSED LOAD T/m2

A.                                                   TURBINE BUILDING.:-
                                                       1. Ground Floor  (general)                         2.50
                                                       2. Ground Floor ( unloading )                    5.00
                                                       3. Operating & equipment lay down          3.50
                                                       4. Intermediate floor and other areas         1.50
                                                       5. Grating , roof ,stair ,chequered pl          0.50


Turbine Deck casting inside the Powerhouse area

(to be continued)

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