ITEM 516 EXPANSION AND CONTRACTION JOINTS JOINT SEALERS AND BEARING
DEVICES
516.01
Description
516.02
Fabrication
516.03 Coating
516.04
Materials
516.05
Expansion and Contraction Joints
516.06 Joint
Sealers
516.07 Bearing
Devices
516.08 Method
of Measurement
516.09 Basis of
Payment
516.01 Description. This work consists of
fabricating, assembling, constructing, coating, and installing expansion and contraction
joints, vertical extension of structural expansion joints, joint sealers, or
bearing devices of the type and size specified.
516.02 Fabrication. Fabricate metal joint
armor and metal bearings according to Items 513. Select
a fabricator that is at least pre-qualified at level SF. The Department
will base final acceptance of fabricated members on the Engineer’s approval
that the fabricated items that can be successfully incorporated into the
structures. Submit mill test reports for structural steel, steel
castings, bronze, and sheet lead certified according to 501.06.
516.03 Coating. Coat exposed steel bearings
according to Items 513 and 514 that
are to be attached to structural steel. Galvanize bearings according to 711.02 that are to be attached to concrete
beams.
Coat metal parts
of expansion joints with metalized 100 percent zinc wire. Prepare the
surface to be coated and apply coating as required by The Society of Protective
Coatings SSPC-CS-23.00(1).
Apply coating to a minimum thickness of 6 mils.
Repair metalized
coatings damaged during fabrication by removal of the damaged coating and
reapplication as specified above. Repair metalized or galvanized coatings
damaged during shipping, construction, or field welding according to 711.02.
516.04 Materials. Furnish materials conforming to:
Structural
steel.............................................................. 513
Bearing bolts and anchor
rods................................. 711.10
Painting.........................................................................
514
Joint sealer, hot
applied............................................ 705.04
Preformed elastomeric
compression stager.............. 705.11
Neoprene
Sheeting................................................... 705.13
Steel
castings........................................................... 711.07
Sheet
copper............................................................ 711.15
Bronze...........................................
711.16, 711.17,
711.18
Sheet
lead................................................................. 711.19
Preformed bearing
pads........................................... 711.21
Elastomeric
bearings................................................ 711.23
Preformed
fillers...................................................... 705.03
Swedged anchor bolts or bars*................................
711.10
*
Fabricated by deforming a minimum of 20 percent of the embedded bolt surface
with deformations whose radial dimensions are 15 to 20 percent of the bar
diameter.
516.05 Expansion and Contraction Joints. Ensure
that expansion joints are completely open for the dimension specified for their
full length. Remove stones, forms, or other materials that interfere with
expansion.
Finish the
surface adjacent to preformed expansion joints to a smooth, uniform
surface. Use methods that do not interfere with the free compression of
the joint material to anchor the expansion joint materials. The joint
material shall neatly fill the space, and have a uniform thickness for the full
extent of the joint.
For
Integral and Semi-Integral Abutment Expansion Joint Seals, install a 3
foot wide neoprene sheet for waterproofing of the backside of the joint between
the integral backwall and the bridge seat at
locations shown in the plans. Secure the neoprene sheeting to the concrete with
1 1/4 inch by #10 gage (length × shank diameter) galvanized button head spikes
through a 1 inch outside diameter, #10 gage galvanized washer. Maximum fastener
spacing is 9 inches. Use of other similar galvanized devices, which will not
damage either the neoprene or the concrete, will be subject to the approval of
the Engineer.
Center
the neoprene strips on all joints. For horizontal joints, secure the horizontal
neoprene strip by using a single line of fasteners, starting at approximately 6
inches from the top of the neoprene strip. For the vertical joints secure the
vertical neoprene strip by using a single vertical line of fasteners, starting
at approximately 6 inches from the vertical edge of the neoprene strip nearest
to the centerline of roadway.
For
vertical joints, install two additional fasteners at 6 inches, center to
center, across the top of the neoprene strip on the same side of the vertical
joint as the single vertical row of fasteners is located. The vertical neoprene
strips shall completely overlap the horizontal strips. Lap lengths of the
horizontal strips that are not vulcanized or adhesive bonded, shall be at least
1 foot in length, or 6 inches in length if the lap is vulcanized or adhesive
bonded. No laps are acceptable in vertically installed neoprene strips. The
neoprene sheeting shall be 3/32 inch thick general purpose, heavy-duty neoprene
sheet with nylon fabric reinforcement.
516.06 Joint Sealers. Before applying joint
sealer to the surface, clean the concrete of foreign matter, curing compounds,
oil, grease, dirt, free water, and laitance and clean steel by sand blasting.
Apply
joint sealer with a minimum depth of 1 inch (25 mm) at its thinnest
section. Fill joints to within 1/4 inch (6 mm) of the roadway surface.
Separate
joint sealer from contact with asphalt concrete using a barrier of foil or
other material that is impervious to the joint sealer.
As
required to prevent bonding of the joint sealer with a joint surface, place a
suitable bond breaker barrier before applying the joint sealer.
Remove
joint sealer that did not bond to the joint face as intended within 24 hours
after placing. Clean the joint by sandblasting and reseal the joint.
Mix
and place joint sealer according to the manufacturer’s instructions.
Provide the Engineer with a copy of the manufacturer’s instructions.
Protect joint
sealer with an impervious masking tape during the application of concrete
protective coatings containing mineral spirits.
516.07 Bearing Devices. For sliding plates,
lubricate the sliding surfaces with flake graphite, and superimpose plates on
each other with their edges flush.
Accurately set
the level and alignment of elastomeric bearings, bearing plates, and
bolsters. Set bearing plates and bolsters on 1/8-inch (3 mm) thick sheet
lead, conforming to 711.19, or on 1/8-inch (3 mm) thick preformed bearing pads,
conforming to 711.21.
Set bearing
plates or bolsters on bridge seat areas that are flat and smoothly
finished. If the bridge seat area is high or uneven, use a bushhammer or grinder followed by thin film of portland cement mortar or paste to
fill the pitted surface to bring the seat area to the proper elevation and
provide a level, even surface. If the bridge seat area is low, use steel
plate shims of the same bearing area as the bearing plates and bolsters to
bring the seat area to the proper elevation.
Set
elastomeric bearing pads directly on the concrete surface. If the beams seats
are sealed with an epoxy or non-epoxy sealer prior to setting the bearings, do
not apply sealer to the concrete surfaces under the proposed bearing locations.
If these locations are sealed, remove the sealer to the satisfaction of the
Engineer before setting the bearings. Perform this removal at no expense to the
Department.
Position
rockers, elastomeric bearings, and rollers so that, when the completed bridge
is at 60 °F (16 °C), the rockers and elastomeric bearings are vertical and
the rollers are centered on the base. If the steel is erected at an ambient
temperature higher than 80 °F or lower than 40 ºF and the bearing shear
deflection exceeds 1/6 of the bearing height at 60 ºF ± 10 ºF, raise the beams
or girders to allow the elastomeric bearings to return to their undeformed shape at 60 ºF ± 10 ºF.
Set
anchor bolts for bearing devices that are clear of the beam or girder flanges,
in the concrete after erecting the main structural steel, except as specified
below for bearing devices at abutments. Place reinforcing steel in the
bridge seat to not interfere with the drilling of anchor holes.
Accurately set anchor bolts in the holes and embed the anchor bolts in cement
mortar. Until the anchors’ are installed, prevent water from entering and
or freezing in the anchor bolt holes.
If
structural steel interferes with the setting of the anchor bolts, set the
anchor bolts before erecting the steel. The Contractor may determine the
location of the bolts by using a template and form holes or embed the bolts
when placing concrete or, drilling holes in the hardened concrete.
Install
anchor bolts to project at least 1/4 inch (6mm) beyond the nut when tightened.
Damage or burr the threads on the projecting end of the bolt after the nut is
tightened. The bolt threads shall not extend to the planes of the contact
surfaces between the connected parts. Include the length of two
additional threads to the specified thread length of the bolt to allow for
thread runout. Washers no thicker than 1/4 inch
(6mm) are permitted under the nut.
Permanently
fasten bearing devices to the abutments, steel beams, or girders after
backfilling the abutments to within 2 feet (0.6 m) of the top of the bridge
seat.
Where the load plate of an elastomeric
bearing is to be connected to the structure by welding, control the welding so
that the plate temperature at the elastomer bonded surface does not exceed 300
°F as determined by use of pyrometric sticks or other
temperature monitoring devices.
516.08 Method of Measurement. The
Department will measure the specified items by the number of each, square feet
(square meters), pounds (kilograms), or feet (meters) horizontally along the joint
centerline and between the outer limits of the fabricated joint.
For
deck resurfacing, the Department will measure Structural Steel Expansion Joints
extending vertically by the actual horizontal length of joint.
516.09 Basis of Payment. The Department
will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
516
Foot or
Pound
Structural Steel Expansion Joints
(Meter or Kilogram)
516
Foot
(Meter)
Structural Expansion Joints Including Elastomeric ___ Seals
516
Foot
(Meter)
Elastomeric Compression Seals for Structural Steel Joints, ___ Width
516
Foot
(Meter)
Folder Copper Strip ___
516
Foot
(Meter)
Vertical Extension of Structural Expansion Joints
516
Square
Foot
___ Preformed Expansion Joint Filler
(Square
Meter)
516
Foot
(Meter)
Joint Sealer
516
Each,
Foot,
Bearing Devices
Square Foot, Pound
(Meter, Square Meter,
Kilogram)
516
Each, Square Foot
___ inch (___ mm) Elastomeric Bearing Pad
(Square
Meter)
516
Each
Elastomeric Bearing with Internal Laminates Only
516
Each
___ ´ ___ ´ ___ Elastomeric Bearing with Internal Laminates
and Load Plate ___ ´ ___ ´ ___
516
Square
Foot
1/8-inch (3 mm) Preformed Bearing Pads
(Square
Meter)