part-2 Turbine
Turbine foundation will be done by Main civil vendor.
In earlier days turbine foundation was casted as a single
unit. But now a days springs are introduced in between . Therefore bottom
portion of the turbine columns are casted then springs were installed after
that top portion of the foundation are being casted. In India most of the
spring are supplied by manufacturer called GERB. This technology introduced in
India since twenty to twenty five years. Feedbacks are not available how the
machine behaves in longer run.
The advantages of spring loaded foundation are given below.
1. The vibration to
the main column is isolated by the spring element resulting to small size base
mat which reduces the construction cost and time.
2. The
same column of TG deck may also be used to support surrounding floors at the
building, so that the total numbers of columns are reduced and the space to
accommodate more equipment is increased. This results in more rigidity of
building structure of surrounding floors and further in cost saving.
3. Excessive
settlement of column can easily be adjusted by inserting or removing shims in
spring units.
4. It
is possible to tune the foundation subsequently by replacing the spring
elements having different load capacity of the springs.
5.
Machine
will have more steadiness and stability in the event of earthquake compared to
normal foundations.
FOUNDATION CHECKING BEFORE CASTING
Get centre line and elevation point both side of the turbine
foundation and make arrangement for piano wire fixing.
Check positioning of all the inserts and fixed points with
respect to centre line in transverse and
longitudinal direction as per manufacturer drawings and civil drawings.
Discrepancy if any to be resolved before
casting. A typical inserts plate drawing was given on part-I of this blog.
Check elevation of all points.
Check verticality of all the pipe sleeves with the help of
plumb.
Ensure proper locking of all insert and fixed points before grouting.
Ensure levelling on the fixed points of LP girder and LP rear
pedestal.
Preserve machined surfaces of all the fixed points against
any damages due to handling.
Ensure proper flatness of the bottom seating plate of all the
inserts.
Ensure proper stiffeners in all the vertical and horizontal
embedment provided for various purposes like hangers and supports etc.
Ensure proper cleaning of the area before casting.
Remove all unwanted material.
All data to be noted in tabular form for future reference.
Checking should be carried out after completion of all reinforcement
fixing and completion of shuttering including supports of shuttering. It may
one or two embedded part approach will be not be easy. Take suitable decision
on the spot regarding checking. Transfer the reference point to adjacent column
for future reference.
continued to Part-iii
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