Sector 12A structural drawing updated to Revision 4
The March 2140 engineering drawing records the arrangement of road, freight and communications infrastructure in Sector 12A. Technical correspondence should identify both the document number and revision.
ITA Engineering has issued Revision 4 of structural drawing TAB-SC-12A-1, dated March 2140. The plate presents a sectional view of Sector 12A, showing the relationship between the road deck, freight railway and communications infrastructure within the bridge structure.
The upper deck contains eight road lanes beneath an enclosed framework. Below it, the reinforced freight deck accommodates four heavy tracks. The drawing shows these transport levels separately, allowing references to road and rail infrastructure to be distinguished within the same structural section.
Communications conduits occupy the lower portion of the assembly. The S4 fibre conduits, subsea fibre-optic cables and core data networks are identified individually. Correspondence concerning these systems should retain the designation shown on the drawing; the general description “below the railway” is insufficient to identify a component.
A separate detail illustrates the articulated hydraulic mass dampers within the seismic dampening assembly. This detail accompanies the main section and should be read with its document reference intact.
Personnel citing the plate in inspection notes, maintenance requests or technical correspondence should record TAB-SC-12A-1 and Revision 4. Where a discrepancy is reported, the affected deck, track, conduit or assembly should also be identified. Cropped reproductions should retain enough of the drawing to establish which component is being discussed.
The plate records the arrangement of infrastructure. Work instructions, movement schedules and access conditions remain separate operational records.
Issued by ITA Engineering