No utility attachment to a bridge or traffic structure will be considered that proposes any of the following practices.
Burying conduits or cables in bridge slabs or sidewalks.
Drilling holes outside the middle third of the web of load carrying steel structural elements.
Welding on structural steel elements of the structure.
Drilling into pre-stressed or post-tensioned, concrete supporting beams. Casting inserts into the bottom of pre-stressed concrete members.
Attaching in manner that will reduce critical clearances.
Attaching outside the fascia of the bridge or structure.
Gas pipelines over four (4) inches (102mm) in diameter or having internal pressure in excess of seventy-five (75) pound psig (520 kPa). More than one gas pipeline for each structure.
Pipelines carrying liquids or gases of an extraordinary hazardous nature shall not be attached to highway structures.
(B)Acceptable Attachment Practices. When and where the attachment of a utility to a highway bridge or structure is given favorable consideration, the following general practices shall be followed:
The attachment shall be located below the floor of the structure between beams or girders and above the lowest structural member on existing structures. Conduits may be designed into a new structure for approved attachments.
Supports and/or hangers shall be designed to clamp or bolt to steel structural elements.
Supports and/or hangers shall be designed to clamp or bolt to pre-stressed or post-tensioned concrete structural elements.
Utility facilities may be hung from inserts drilled on existing bridges or cast on new construction into non-critical concrete areas such as the floor slab. Inserts on new construction will be furnished and installed by the Department and show in detail on construction plans.
The petitioner shall submit plans and specifications showing the size, weight per foot, and proposed method of attachment of the utility elements and stating the type of commodity to be transmitted, the proposed pressure or voltage, and giving the proposed location of cutoffs adjacent to the structure.
A permit for bridge attachment shall provide conduit or pipe capacity for any anticipated expansion. In the interest of simplification, the assessment charge shall be calculated assuming that all conduits of the proposed system are filled.
All work of attachment and maintenance of the utility facilities shall be accomplished by the utility. In the case of a new bridge or traffic structure, the contract special provisions will require the County’s contractor to cooperate with the utility company with the understanding that the utility company will furnish and install the necessary conduits or pipes and appurtenances.
It shall be the general policy of the Department to grant for accommodation of utilities on bridges only when engineering and economic study substantiates that all other means of accommodating the utility are not practical. Other means shall include, but not be limited to, underground, under stream, independent poles, cable supports, tower supports, etc., all of which are completely separated from the bridge. The utility company shall include the supporting data, in their request, that indicates the impracticality of alternate routing.