Electrical panels, motor control centres, control panels, instruments,
conduits, cable tray hangers, minor field routed pipe hangers, tanks,
galleries, ladders stairs and other minor non vibratory equipment, structures
and piping mounted on concrete floors and walls may be fastened with the
concrete expansion anchors suitable for the Site's environmental conditions and
shall be designed, furnished and installed by the Contractor. The Contractor's
drawings shall clearly indicate all concrete expansion anchors used in his
work. Concrete expansion anchor not be permitted for any vibratory equipment.
QUALITY ASSURANCE /
QUALITY CONTROL (QA/QC)
Contractor shall fully comply with the Project Quality Assurance/Quality
Control Requirements. For submitting Quality Assurance/Quality Control
Procedures and Documentation the Provision of clause “Submittals” of this specifications shall
apply.
SUBMITTALS
After the
contract signed, the contractor shall furnish complete and comprehensive data
or specification regarding the material of his proposed anchor bolts for the
Owner’s approval.
Test data and reports of the quality control procedures and
documentation as specified below.
§
Non-destructive testing.
§
Packaging and shipping.
§
Test procedures.
DEFINITIONS
For all expansion anchors, the following terms, when used in
this specification or on the Contractor's design drawings, shall have the
following meanings:
SLEEVE TYPE EXPANSION ANCHOR
A split expansion shield and a threaded stud bolt with
cone expander.
WEDGE TYPE EXPANSION ANCHOR
A split expansion ring (or a separate expansion wedge pair) and a
threaded stud bolt with integral cone expander (or taper expander).
MATERIAL
TYPE AND FINISH OF MATERIALS
Concrete expansion anchors and accessories shall be made of carbon steel
with zinc plated finish conforming to U.S. Federal Specification QQ-Z-325C or
approved equal. Stainless steel may be used in place of this zinc coated carbon
steel.
STRENGTH OF MATERIALS
The material shall have a minimum yield strength of 4220 kg per sq. cm
for wedge type anchors, and 3515 kg per sq. cm for sleeve type anchors. The
material shall have a minimum tensile strength of 5270 kg per sq. cm for all
anchors.
CROSS SECTIONAL AREAS
The smallest cross sectional area of the stud bolt of
an expansion anchor shall not be less than the cross sectional area at the
thread rod.
SIZE LIMITS
The size
limits for expansion anchors shall be as follows: (All sizes of bolt for sleeve
and wedge type anchors shall be shown on The Contractor's drawings).
Sleeve Type: 6 mm through 15-mm diameters of stud bolts.
Wedge Type: 6 mm through 25-mm diameters of stud bolts.
INSTALLATION
GENERAL PROVISIONS
All concrete expansion anchors shall be installed in accordance with the
manufacturer's specifications and recommendations and the requirements of this
Specification. In case of conflict, the
requirements of this specification shall govern. The locations where expansion anchors will be
installed and the sizes of these anchors shall be as indicated on Contractor's
design drawings.
The
minimum effective embedded length, spacing and edge distance for expansion
anchors shall conform to the latest code and standard unless otherwise
indicated in indicated in the Bid Drawing. The minimum projection of the
threaded part of a bolt beyond the nut shall be 6 mm after anchor installation
is completed. The projection over 6 mm shall not be removed without the consent
of The Owner.
The Contractor shall determine the overall anchor
length and the hole depth required such that the specified minimum effective
embedded length and bolt projection can be obtained.
Holes for the anchors may be drilled through hardened
grout for finish concrete, but the effective embedded length shall be
determined from the surface of the rough concrete. Also, such holes may be
drilled through surface repaired concrete, but the effective embedded length,
anchor spacing and edge distance shall be determined in accordance with latest
code and standard. Holes shall not be drilled through grout or concrete that
has not completely hardened nor shall grout or concrete is placed around un-
tightened anchors.
Reuse of expansion anchors will not be permitted.
Welding on expansion
anchors will not be permitted.
For anchors installed in holes drilled through surface
repaired concrete, the dimension (L) given in above clause shall be increased
by a dimension x as shown in standard drawings.
Minimum effective embedded lengths, spacing and edge
distance indicated on the standard drawings sheets 1,2 and 3 shall be adjusted
as follows under certain conditions:
When two anchors of different diameters are installed
adjacent to each other, the dimension of minimum spacing ("S") shall
be the average of the two "S" dimensions for these diameters
respectively.
If dimensions of minimum edge distance (ED), minimum
edge distance to an embedded sleeve (ES) and the minimum spacing (S) cannot be
maintained between two anchor assemblies, the allowable erection tolerance
indicated on the standard drawings shall be used to resolve the problem. If the
problem involves anchors installed by two different contractors, their erection
tolerances shall be used, or the Owner shall be notified for a resolution.
Minimum distance from an anchor to an embedded steel
plate shall equal S.
Unless
otherwise indicated, no expansion anchor shall be installed at the following
locations:
The bottom of a concrete beam; and the top and sides
of the concrete beam, at each end within a clear distance equal to 1/4 clear
span of the beam.
The bottom of concrete slabs on metal deck, at the
ribs of the deck.
Masonry and hollow concrete block walls.