****THIS IS A
NEW APPENDIX. – PLEASE READ CAREFULLY.****
MODULAR EXPANSION JOINT ASSEMBLY
The requirements for the Modular Expansion
Joint Assembly (MEJA) shall consist of furnishing materials and incidentals
necessary to design, fabricate, test, certify, and install the modular
expansion joint assembly as specified in the Contract documents. Additionally,
this work will consist of the design, detailing, and submittal of calculations
and shop drawings for the design of reinforcing steel required in the modular
joint blockout in bridge abutment backwalls and bridge slab. The design and
detail of the reinforcing steel shall meet or exceed the minimum requirement provided
in the design plans. The fabrication and installation of the galvanized barrier
rail cover plates shall also be included herein.
Contractor shall submit details of the
barrier rail conduit expansion fitting in conjunction with the modular joint
barrier rail cover plate details for review and acceptance. Fabrication of the
MEJA and all miscellaneous components shall be fabricated by plants and shops that
are approved prior to the letting.
All products of steel, iron, and coating
employed in the fabrication of the MEJA shall be from domestic origin, melted,
processed, and manufactured in the USA.
Approved fabricating shops are listed in this
Materials for the MEJA shall comply with the
- Blockout concrete shall be in accordance
with project plans and specifications.
- Reinforcing steel shall be epoxy coated,
meeting the requirements of Article 4151 of the Standard Specifications
and shall be from approved sources (refer to IM 451 Appendix D) and
approved suppliers (refer to IM 451 Appendix B) and approved coaters
(refer to IM 451.03B Appendix A).
- Pre-formed elastomeric joint seal and
lubricant adhesive meeting the requirements of
Article 4136 of the
Standard Specifications and AASHTO M 220.
- Structural steel meeting the
requirements of Article 4152 of the Standard Specifications.
- Galvanizing shall meet the requirements
of ASTM A 123 or AASHTO M 111.
- Stainless Steel shall meet the
requirements of ASTM A 240 / A 240 M, Type 304 with Class 2 B-Finish.
- Stainless steel mating surfaces shall
meet the requirements of ASTM 240 / A 240 M, Type 304, minimum No. 8
mirror finish for mating surface. Minimum 16 gauge thickness for
stainless steel plate.
- Poly-tetra-fluor-ethylene (PTFE) shall
be 100% virgin Teflon, woven PTFE fabric or dimpled PTFE and shall meet
the requirements of AASHTO, Section 18.8, Division II.
- Bolts, nuts, and washers and any other
hardware shall meet the requirements of ASTM A 325, A 563 DH and F 436 and
shall be galvanized to the requirements of ASTM B 695, class 55, Type 1.
- Urethane Foam shall meet the
requirements of ASTM D 3574.
- Springs, bearings, and equidistant
devices shall have the same material composition and formulation,
manufacturers, fabrication procedure, and configuration as those used in
the pre-qualification tests.
- Fabrication of the MEJA shall be
performed in an approved facility owned and operated by the manufacturer
that is responsible for the design of the joint assembly. The facility
shall be AISC Certified for category “Simple Steel Bridge Structures” or
AISC Certified for category “Major Steel Bridge”. Approved fabricator in
both bridge categories shall have a quality control management system and
experience utilizing fabrication practices in compliance with the contract
requirements for the fabrication of MEJA. A written documentation of the
fabricator’s experience shall be provided for review and approval.
- Welding shall conform to the
requirements of ANSI / AASHTO / AWS Bridge Welding Code D 1.5-2008 welding
shall be performed by a certified welder and weld procedure specification
(WPS) shall be submitted for approval.
- Fabricator shall thoroughly clean and
remove excess galvanizing material from interior portions of steel
extrusions prior to installing elastomeric seals.
- Damage to the joint system during
shipping , handling, or installation shall be cause for rejection of the
- Repair damage to the corrosion
protection system in accordance with the IM requirements and to the
satisfaction of the Engineer.
- Design the MEJA, fabricate and deliver
to the job site as a continuous unit. Field welding of the MEJA is not
- Single piece seals shall be provided.
Seals shall be shop installed, except when indicated otherwise. No
splices are permitted.
- Edge beams and center beams shall be machined
or extruded to form the required profile. Multiple pieces welded to form
the profile or bent / crimped to form the required profile are not
- Furnish a joint such that the bearings
and slide assemblies are removable and replaceable.
- Provide uniform gaps for all joint
seals. The allowable difference in gaps at either end of a joint seal is
1/2 inch maximum
- To reduce corrosion potential,
electrically isolate the MEJA by not connecting the bridge deck
reinforcement to the MEJA
The Modular Expansion Joint Assembly (MEJA)
that is either a single support bar system with sliding yokes or a welded
multiple support bar system can be furnished by one of the following approved
The D.S. Brown
PO Box 158
300 E. Cherry Street
North Baltimore, OH
Watson Bowman Acme
95 Pineview Drive
Amherst, NY 14228
D.S. Techstar Inc.
1219 W. Main Cross
Findlay, OH 45840