architecture intercity motorway nakhon ratchasima bangpa in to korat motorway in thailand during construction

architecture bangpa beams blue box bridge build building concrete connect construction engineering equipment gantry girder high industrial infrastructure intercity korat launcher launching motorway nakhon overhead pillar posttension project public ratchasima road section segment sequence site sky skybridge span station steel street stressing structure system tall technique technology tendon thailand tower track traffic transport transportation truss