accident
age
city
concrete
conduit
construction
corrosion
dilapidation
drain
drainage
duct
emergency
energy
engineering
equipment
excavation
grunge
heavy
industry
land
leak
metal
municipal
network
new
old
pipeline
pipes
pits
plumbing
reconstruction
repair
repairing
replacement
round
rust
safety
sand
sewage
sewerage
steel
supply
system
technology
trench
worn
定額
Replacement of heating pipes and modernization of the heating system. Construction works on large iron pipes at a depth of excavated trenchの素材 [FY310175817147]
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