activity

architecture

background

build

building

clamp

close

connector

construction

engineering

equipment

finishing

frame

framework

green

height

high

industrial

industry

iron

job

men

metal

occupation

people

pipe

platform

project

protection

risk

safety

scaffold

scaffolding

site

stack

staging

steel

strength

strong

structural

structure

support

temporary

tool

tower

tube

used

work

worker

workers

workplace

works