5. TRANSPORT DRAWINGS
TNDOT will require some configuration of a “ Dual Lane Transporter” to cross the bridges on HWY 12. The exact configuration will not be known until TNDOT Bridge engineers evaluate each structure. Use of a Dual Lane Transporter is not a guarantee of a permit approval. Some bridges just do not have the capacity to hold these types of MEGA-LOADS. In some cases, bridge shoring must be installed, on shorter spans jumper ramps may be an option, in some cases using a suspension beam transporter and using various crab steer techniques are required to gain approvals. TNDOT usually does their own bridge analysis, however on some past projects TNDOT has allowed Barnhart to bring in 3 rd party bridge engineers specializing in Bridge analysis to prepare evaluations for TNDOT Bridge engineers review and approvals. Barnhart cannot emphasize enough that bridges can be very problematic and finding solutions to these problems can take months working with Bridge engineers. The solutions can be very expensive to overcome. We highly recommend investing the resources to identify and resolve these issues far ahead of the project to mitigate cost escalations at time of execution.
The following are examples of Dual Lane Transporters used on past projects to get these MEGA-LOAS across bridges.
Example #1- 18-line axle THP with Dolly Wing Extensions
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