751.18 Concrete Multicell Box Girder Bridges
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Contents
751.18.1 Reinforcement
751.18.1.1 Single Column Design
Top Slab Modifications at Intermediate Bent:
The reinforcement shown below shall be used in place of the design slab steel.
(1) designed slab steel
![751.21 cont conc box girders section at int bent single column.gif](/files/2/2e/751.21_cont_conc_box_girders_section_at_int_bent_single_column.gif)
(SINGLE COLUMN)
751.18.1.2 Web Reinforcement
Top Slab Modifications at Intermediate Bent:
![751.21 cont conc box girders typical section thru web & slabs.gif](/files/b/b1/751.21_cont_conc_box_girders_typical_section_thru_web_%26_slabs.gif)
751.18.2 Miscellaneous Details
751.18.2.1 Access Doors
ACCESS DOORS (RECTANGLE)
![751.21 cont conc box girders rectangle access door plan.gif](/files/5/5d/751.21_cont_conc_box_girders_rectangle_access_door_plan.gif)
![751.21 cont conc box girders rectangle access door sec aa.gif](/files/7/77/751.21_cont_conc_box_girders_rectangle_access_door_sec_aa.gif)
WEIGHT 179#
ACCESS DOORS (OVAL)
![751.21 cont conc box girders oval access door plan.gif](/files/4/41/751.21_cont_conc_box_girders_oval_access_door_plan.gif)
![751.21 cont conc box girders oval access door sec aa.gif](/files/b/b9/751.21_cont_conc_box_girders_oval_access_door_sec_aa.gif)
![751.21 cont conc box girders oval access door details.gif](/files/c/cf/751.21_cont_conc_box_girders_oval_access_door_details.gif)
See Section 4A for painting or galvanizing note.
ACCESS DOORS LOCATION
![751.21 cont conc box girders access door location.gif](/files/d/d1/751.21_cont_conc_box_girders_access_door_location.gif)
- Generally, access doors shall be positioned on or near 1/4 point of span and centerline of roadway.
It is permissible to shift position of access doors when:
- Girder is located at centerline of bridge
- To prevent cutting additional slab bars
- To clear construction joints
- To maintain adequate vertical clearance
If possible, do not locate access doors over a roadway or berm.
![751.21 cont conc box girders access door reinforcement.gif](/files/6/66/751.21_cont_conc_box_girders_access_door_reinforcement.gif)
PLAN OF ACCESS DOOR SHOWING REINFORCEMENT |