scope:

This Standard applies to Deep Tube Tunnel assets owned by, or being constructed for, LU.

This Standard defines the requirements for Deep Tube Tunnel assets through the following lifecycle stages:

a) Inception and design;

b) Construction, installation, testing and commissioning;

c) Inspection;

d) Analytical assessment;

e) Condition assessment and certification;

f) Maintenance;

g) Strengthening and Renewal; and

h) Decommissioning.

Purpose

The purpose of this Standard is to define the whole life cycle requirements for Deep Tube Tunnel and Shaft assets. These assets are collectively defined as "Deep Tube Tunnels" in the Deep Tube Tunnels Foundation Document which is contained in LU Standard S1042 (Asset Condition Reporting).

Tunnel Portal structures shall be designed as Earth Retaining Structures in accordance with LU Standard S1051 (Civil Engineering - Bridge Structures)

In defining requirements specifically applicable to Deep Tube Tunnel assets, this Standard complements LU Standard S1050 (Civil Engineering - Common Requirements) that defines mandatory requirements generally applicable to all Civil Engineering assets including the Deep Tube Tunnel assets.

A supporting Manual of Good Practice G-055 gives guidance and explanation on Deep Tube Tunnel assets.