When the Contractor performs
survey work, the Engineer shall verify the Contractor’s accuracy by observation
of the work and review of notes. A state
survey crew should be available to check any part where this accuracy is not
obtained. The Contractor’s surveyor
should cooperate with the Engineer and provide the notes on critical work, such
as bridge seat elevations, profiles of beams or girders, and grade for
finishing the deck for review and concurrence.
Information that indicates the elevation of bridge seats and deck grades
have been properly set and must be recorded in the project file.
Relations between the
Engineer and surveyor should be in the spirit of cooperation toward achieving
the common goal of bridges constructed of specified quality, in plan location,
and on proper grade that will benefit both the state and the Contractor.
When railroad involvement is
required, as specified in 501.05.A,
it is the Contractor’s responsibility to submit working drawings to the
involved railroads for acceptance at least 50 days before construction
begins. The Contractor shall supply the
Engineer with documentation proving railroad acceptance. Department acceptance is not required. The
following working drawings should be submitted to the Engineer at least 7 days
before construction begins. These
working drawings shall be prepared by an Ohio Registered Professional
Engineer (PE) and checked by a second PE.
No Department acceptance is required. Lack of departmental acceptance
does not supersede the Engineer’s authority per C&MS 105.04.
1. Sheeting and excavation bracing which impacts active
traffic or with an exposed height over 8 feet or when required by contract,
except when a complete design is shown in the plans.
2. Demolition of structures over or adjacent to active
traffic.
3. Falsework for cast-in-place concrete slab bridges.
4. Erection of steel or precast concrete structural
members.
5. Jacking and support of existing structures.
6. Construction loads applied to a structure during
construction in excess of 75 percent of legal load.
7. Structures for maintaining traffic.
Although no Department
acceptance is required, these working drawings should be utilized in the field
as the standard to judge whether the Contractor is performing the work
correctly.
Stop all operations that do
not follow the prepared working drawings. The Contractor must submit to the
Engineer any revised working drawings, which are prepared by an Ohio Registered Professional
Engineer, 24 hours before construction on the deviated work begins.
If the Contractor requests to
weld to a main structural member that is not shown on the Contract drawings, he
must submit a plan to the Office
of Structural Engineering for acceptance at least 20 days before
construction begins.
If a Contractor has to
perform corrective work on structures items, the Contractor must submit three
copies of a corrective work plan (CWP) to the
Engineer, including supporting calculations prepared by an Ohio Registered Professional
Engineer. The Engineer will submit the CWP to the
Office
of Structural Engineering for review and acceptance prior to performing
corrective work.
When traffic is maintained
while an overhead structure is being removed, platforms, nets, or other devices
must be provided to safeguard the traveling public from falling objects that
might fall directly onto the roadway below, be deflected toward the traffic, or
bounce into traveled lanes. Removal of
superstructure concrete and structural steel shall, in no case, take place
directly over traffic due to the possibility of large pieces falling through
the protective devices.
This section outlines the
Contractor’s requirements for fabrication, shop drawings, material
certification, and erection procedures.
Use Erection Checklist Form CA-S-20