(A) Pro­hib­it­ed Attach­ment Practices.

  1. 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:

  1. 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.
  2. Sup­ports and/or hang­ers shall be designed to clamp or bolt to steel struc­tur­al elements.
  3. Sup­ports and/or hang­ers shall be designed to clamp or bolt to pre-stressed or post-ten­­sioned con­crete struc­tur­al elements.
  4. 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.
  5. 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.
  6. 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.
  7. 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.