bolt
box girder
bridge
building
concrete
construction
crane
development
erection
estate
fasten
fastening
girder
industrial
industry
instrument
iron
machinery
metalwork
metric
nut
overturning
pitch
plant
post tension
power
round
scaffolding
screw
segmental
steel
structure
stud
stud bolts
technology
tension
thread
threadform
tighten
viaduct