ERECTION OF TURBINE GENERATOR PKG PART-III, CHECKING OF TG FDNS PRE AND POST CASTING - ABC OF THERMAL POWER PLANT.

PART_III

Supervision during casting under progress for TG foundation

Check that there is  no disturbance to the insert etc. during pouring of concrete while vibrators are used.

About 15-20 mm extra concrete may be left on top on all the pedestals and LP base plate area for chipping/cleaning purpose at a later date. Surface of the concrete needs to be blue matched with the surface plate therefore chipping of top layer of concrete is to be removed.

Close all the pipe sleeve from top to avoid entry of concrete inside. Alternately the pipe sleeve should be filled with sand.

CHECKING OF FOUNDATION AFTER CASTING

Clean complete foundation and remove all shuttering etc.

Ensure there is no loose concrete layer in the region where the pedestal and base plates are to be laid. No repair should be done in this region without consulting the turbine erection engineer.

Cover all the opening before checking any dimensional measurement to avoid any accident.

Establish a suitable longitudinal axis considering the fixed point of the LP rear pedestal and various pipe sleeves / inserts.

Establish a transverse axis as 90 degree with the help of Total station.

Measure pitching/elevation of all the inserts and fixed points.

Measure elevation of all foundation on different pedestal and LP base plate area.

Check level of LP rear pedestal fixed points and if required correction may be carried out.

PREPARATION OF FOUNDATION FOR PLACEMENT OF PEDESTALS AND BASE PLATES.

Foundations are to be cleaned and loose concrete are to be chipped off.

Maintain elevation of foundation to ensure correct thickness of non-shrink grout.

A reference point for elevation in respect of machine centre line (equivalent to LP rear pedestal) is

to be maintained at a proper place. This point is to be preserved with proper protection. For making

reference point a one side ground plate of about 200 x300 x20 mm may be used. This may be

welded on a I-beam near Generator.

The cover all the opening before checking any dimensional measurement to avoid any accident.

Establish a suitable longitudinal axis considering the fixed point of the LP rear pedestal and various pipe sleeves / inserts.

Establish a transverse axis as 90 degree with the help of Total station.

Measure pitching/elevation of all the inserts and fixed points.

Measure elevation of all foundation on different pedestal and LP base plate area.

Check level of LP rear pedestal fixed points and if required correction may be carried out.

PREPARATION OF FOUNDATION FOR PLACEMENT OF PEDESTALS AND BASE PLATES.

Foundations are to be cleaned and loose concrete are to be chipped off.

Maintain elevation of foundation to ensure correct thickness of non-shrink grout.

A reference point for elevation in respect of machine centre line (equivalent to LP rear pedestal) is

to be maintained at a proper place. This point is to be preserved with proper protection. For making

reference point a one side ground plate of about 200 x300 x20 mm may be used. This may be

welded on a I-beam near Generator.

A typical TG Deck casting under progress. Shuttering ,supports , concrete pumps pipes are visisble

in the picture.

Pipe sleeves are positioned amongst the reinforcement rod for TG deck foundation. Checking

of verticality , position become problem due to approach.



Anchor bolts and anchor boxes are placed in a position for 660MW super critical TG deck

foundation.

Checking of anchor boxes positioning are being checked by engineer himself.


Continued to part-iv

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