accident
city
concrete
conduit
construction
construction site
corrosion
dilapidation
drain
drainage
duct
emergency
energy
engineering
equipment
excavation
grunge
heating pipes
heavy
industry
leak
metal
municipal
network
new
old
pipeline
pipelines
pipes
pits
plumbing
reconstruction
repair
repairing
replacement
round
rust
safety
sand
sewage
sewerage
steel
supply
system
technology
trench
urban infrastructure
utilities
worn
定額
Replacement of heating pipes and modernization of the heating system in city. Construction works on large iron pipes at a depth of excavated trenchの素材 [FY310176896087]
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