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Utility tunnel is the construction of urban underground used to accommodate two types of urban engineering pipeline and ancillary facilities.
The minimum allowable depth of cover is the largest of:
For roads H=B/8+0.2(m) H=B/6(m) and not less than 0.6（m）
For railways H=B/4 and not less than 0.6(m)
There is a possibility to reduce depth of cover provided that suitable checking calculations will be made.
|Flexible structure||Plate thickness||Kinds of standard corrosion protection||Required average min value(um）|
|plates||≧6mm||Hot zinc galvanizing||85|
|≧3mm do < 6mm||Hot zinc galvanizing||70|
|≧1.5mm do < 3mm||Hot zinc galvanizing||55|
|Bolts and nuts||-||Hot zinc galvanizing||45|
Water: water supply, rainwater, sewage, reclaimed water
Gas: gas, heating
Electricity: strong, weak electricity
Facilities: fire, power supply, lighting, monitoring, Ventilation, drainage, marking
Ports: entrances, exits, hoisting, Air inlet, air outlet, branch
In developed countries, the utility tunnel has existed for more than a century.
As early as 1833, Paris, Britain, London, Hamburg, Germany and other European cities have built underground utility tunnel. In 1933, the former Soviet union built underground utility tunnel in Moscow, Leningrad, Kiev, Lenin. 1953 in Madrid, the construction of the underground utility tunnel.
Others such as Barcelona, Stockholm, New York, Toronto, Montreal, Lyon, Oslo and other cities, have built a more complete underground utility tunnel system.
At present, only Beijing, Shanghai, Shenzhen, Shijiazhuang,, Rizhao, Suzhou, Shenyang and other cities have built a utility tunnel, according to incomplete statistics, the national construction mileage of about 800 km Utility tunnel has been upgraded to the national strategy, the future development of the speed will be greatly accelerated Steel utility tunnel as a new structure, with its unique characteristics, in the construction of the utility tunnel, will also play an important role.
A the thin steel plate after cold bending forming, as the main force structure, in underground cities for laying electric power, telecommunications, radio and television, water supply, drainage, heating, gas concentration of municipal pipelines of public space structure.
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