Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Airport; Human Factors
I was the First Officer on this trip and for this leg.  After engine start I called for taxi.  We were pushed back to exit from taxiway S5.  Ground instructed us to 'Taxi via S5; J4; S6; J3.'  I mentioned that we weren't given any hold short instructions; but that I would clarify where ground wanted us to hold on J3 after we started taxiing.  The Captain started to taxi and verified that we were exiting at S5; I concurred as did both [First Officers].  The Captain said we would wait to configure until we were on J3 since there were three 90 degree turns in rapid succession.  As we started to complete the turn onto S5 I began scanning to the right to ensure that J4 had no traffic on it that would be a conflict.  The Captain said; 'What's that?' and I turned my attention to 12 o'clock and saw lighted cones that were on J4 and aligned with the centerline of S5.  The Captain stopped the aircraft.  We stopped well clear of the cones; however; we couldn't turn left or right without the danger of ingesting cones into an engine.  At the Captain's direction I contacted ground and described the situation.  After a ten minute delay ground had us contact maintenance.  Maintenance asked us to start the APU and shut down both engines so they could come out and tow us onto the taxiway.  After another 30 minutes an airport vehicle showed up and with the help of our maintenance; moved the cones to the far edge of the taxiway.  After that we started our engines; completed all checklists and departed RJBB without further incident.There were numerous taxiway closures that were active by NOTAM at the time of our departure.  We were aware of these closures and the Captain specifically briefed their existence.  I believe that the cones were placed in error.  The way they were placed made S5 unusable.  S4 was not available to us as it would join J4 in a section of the taxiway that was closed due to maintenance.Proper placement of the cones.  Also; we could possibly have seen the cones slightly earlier; however; we would have been in the same predicament since their placement rendered S5 unusable to join J4.  Either way; we couldn't have departed our ramp without the danger of FOD.
Air carrier First Officer reported cones were positioned too close to Taxiway S5 at RJBB airport which rendered it unusable. Once they were cleared the flight continued to taxi normally.