Tunnel Construction

 

AIR provides the following codes for tunnel construction:

  200-series construction class codes are not applicable for coverage C.

Construction Code

Category

Description

213

Alluvium Tunnels

Tunnels that were drilled through unconsolidated sedimentary deposits and then typically lined with concrete

 

For exposures in South America, use 2131.

214

Rock Tunnels

Rock tunnels are lined or unlined tunnels that were drilled through rock.

 

For exposures in South America, use 2141.

215

Cut and Cover Tunnels

Tunnels that were constructed by cutting a trench, installing a liner, and then covering the liner with earth

2131

Alluvium Tunnels

Lined or unlined alluvium tunnels with unknown method of construction

 

Valid for South America only.

2132

Alluvial Bored Tunnels

Lined or unlined tunnels constructed through alluvium soil using a boring machine

 

Valid for South America only.

2141

Rock Tunnels

Lined or unlined rock tunnels with unknown method of construction

 

Valid for South America only.

2142

Rock Bored Tunnels

Lined or unlined tunnels drilled through rock using a boring machine

 

Valid for South America only.

2150

Unknown Tunnel

Lined or unlined tunnels with unknown material and unknown method of construction, or other tunnels that cannot be mapped to any of the other tunnel construction class codes

 

Valid for South America only.

2151

Rock Cut and Cover Tunnels

Lined or unlined rock tunnels constructed after excavating a trench and roofing over with an overhead support system

 

Valid for South America only.

2152

Alluvial Cut and Cover Tunnels

Lined or unlined alluvium tunnels constructed after excavating a trench and roofing over with an overhead support system

 

Valid for South America only.

 

 

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Touchstone 3.0 Updated December 02, 2016