| Structural
Bearings |
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| ASPECTS
RELATED TO BEARING PERFORMANCE & INSTALLATION
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Bearings
are to be installed with due care
to ensure their correct functioning
in accordance with the design of the
Structure. The factors to be considered
during the Installation of the Bearings
are :-
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| DESIGN
ASPECT :- |
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Bearings
shall be so located as to avoid
accumulation of dirt & debris
and also from rain water seepage
that may affect their performance.
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Provision
of Jacking Points shall be made
during the design / construction
of the Structure to facilitate
the Lifting of the Superstructure
in future for the Maintenance
or removal of the Bearings.
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The
Bearing manufacture shall be
consulted at an early stage
of the structure design for
tentative Bolt Locations so
that the hassles of Tandons
/ Prestressing Strainds fouling
with the Bearing Dowels shall
be avoided.
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| SUPPLY
ASPECT :- |
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Bearings
are to be supplied with suitable
Identification Plates &
proper marking on top of the
Bearing showing Type, Capacity
and Direction of the Bearing.
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Bearings
shall be Provided with Transport
Brackets firm in position, painted
with red Color for distinguished
appearance.
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Bearings shall be Packed in
Heavy Duty Polythene Sheets
and firmly clamped on the Wooden
crates for safe Transportation.
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| SITE
HANDLING ASPECT :- |
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Transport
Brackets are not to be relied
for the Lifting of the Bearings.
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Upon
receipt of the Bearings at Site,
the contractor shall have a
visual Examination of the bearings
to ensure that no damage of
Displacement of the bearings
is taken place during the Transportation.
Any rectification if required
shall be done strictly in the
presence of the Manufacturers
Representative.
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| INSTALLATION
ASPECT :- |
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Bearings shall be installed
truly horizontal with Top &
Bottom Components of the Bearings
perfectly parallel to each other.
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The
positioning of the Bolts &
Bowels for Both the Substructure
as well as the Superstructure
shall be made as per the Shop
Drawings.
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The
Dowels / Distribution Plates
shall be Properly grouted with
suitable grout material.
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In
case of Moving Bearings, particular
care shall be taken to ensure
the correct Orientation of the
Bearings.
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In
In-situ type of Construction
the Bearings shall be covered
from all sides to avoid the
ingress of cement slurry etc.
inside the bearing Components.
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In
case of Pre-cast Construction,
due care is to be taken while
launching the Girders on to
the Bearings. Girders shall
not be rested freely over the
Bearings without any Support.
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Transport
Brackets shall be removed at
an appropriate time after the
setting of the Superstructure
Concrete.
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Bearings
and its components shall be
checked for any dust, dirt or
Cement Slurry Deposit etc. and
the surrounding area shall be
cleaned thoroughly once the
Process of bearing Installation
is over.
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| ASPECTS
RELATED TO SERVICE LIFE AND MAINTAINANCE OF
THE STRUCTURAL BEARING :- |
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