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ITU-T L.340/L.74 (04/2008)

Maintenance of cable tunnels

Concrete structures such as buildings, bridges, roads, dams and tunnels are deteriorating. Cable tunnels are also deteriorating. For example, cracks and water leakages occur and these phenomena degrade the safety and serviceability of a cable tunnel. If the deterioration is neglected, large-scale repair and reinforcement measures will probably be required, which will further increase the cost in the future. Therefore, it is highly recommended that periodic inspection and timely maintenance be performed.Safety plans related to the maintenance of cable tunnels are discussed briefly in ITU-T Recommendation L.11. A model of a safety plan in the operational phase is presented in Tables A.1 and A.2 of ITU-T Recommendation L.11, with an indication of possible preventive measures. These tables, however, do not describe defects that may occur frequently in reinforced concrete structures such as cable tunnels, and the inspection procedures for maintenance. Therefore, recommendations concerning the maintenance of cable tunnels are needed.

Citation:	https://handle.itu.int/11.1002/1000/9328
Series title:	L series: Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant L series: Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant L.300-L.399: Maintenance and operation L.330-L.349: Infrastructure maintenance
Approval date:	2008-04-06
Provisional name:	L.mct
Approval process:	AAP
Status:	Superseded
Observation:	Former ITU-T L.74 renumbered as ITU-T L.340 on 2016-02-15 without further modification and without being republished.
Maintenance responsibility:	ITU-T Study Group 15
Further details:	Patent statement(s) Development history [4 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
2	L.340 (06/2023)	In force	here	here	here
1	L.340/L.74 (04/2008)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
L Suppl. 4 (04/2016)	Guidelines for developing a sustainable e-waste management system	In force	here	here	here
L Suppl. 5 (12/2014)	Life-cycle management of ICT goods	In force	here	here	here
L Suppl. 20 (10/2015)	Green public ICT procurement	In force	here	here	here
L Suppl. 21 (04/2016)	Implementation guidance for small- and medium-sized enterprises on information and communication technology supply chain due diligence concerning conflict minerals	In force	here	here	here
L Suppl. 27 (10/2016)	Supplement on success stories on e-waste management	In force	here	here	here
L Suppl. 28 (10/2016)	Circular economy in information and communication technology; definition of approaches, concepts and metrics	In force	here	here	here
L Suppl. 32 (10/2016)	Supplement for eco-specifications and rating criteria for mobile phones eco-rating programmes	In force	here	here	here
L Suppl. 33 (10/2016)	Assessment of energy consumption of information and communication technology services	In force	here	here	here
L Suppl. 35 (06/2017)	Framework of disaster management for network resilience and recovery	In force	here	here	here
L Suppl. 41 (05/2021)	Requirements on energy efficiency measurement models and the role of artificial intelligence and big data	In force	here	here	here
L Suppl. 42 (05/2021)	Guidelines on the environmental efficiency of machine learning processes in supply chain management	In force	here	here	here
L Suppl. 43 (05/2021)	Smart energy saving of 5G base stations: Traffic forecasting and strategy optimization of 5G wireless network energy consumption based on artificial intelligence and other emerging technologies	In force	here	here	here
L Suppl. 44 (05/2021)	Guidelines on best practices and environment friendly policies for effective information and communication technology deployment methods	In force	here	here	here
L Suppl. 46 (12/2021)	Definitions and recent trends in circular cities	In force	here	here	here
L Suppl. 47 (07/2022)	Examples of resource saving within the information and communication technology sector	In force	here	here	here
L Suppl. 49 (07/2022)	Overview on adaptation to climate change for information and communication technology networks	In force	here	here	here
L Suppl. 52 (10/2022)	Computer processing, data management and energy perspective	In force	here	here	here
L Suppl. 53 (10/2022)	Guidelines on the implementation of environmental efficiency criteria for artificial intelligence and other emerging technologies	In force	here	here	here
L Suppl. 54 (10/2022)	Guidance for assessing the greenhouse gas emissions consequences of the financial effects generated by information and communication technology	In force	here	here	here
L Suppl. 55 (10/2022)	Environmental efficiency and impacts on United Nations Sustainable Development Goals of data centres and cloud computing	In force	here	here	here
L Suppl. 56 (10/2022)	Guidelines for connecting cities and communities with the Sustainable Development Goals	In force	here	here	here

Title	Approved on	Download
Guide on the use of ITU-T L-series Recommendations related to optical technologies for outside plant	2022	here
Guide on the use of ITU-T L-series Recommendations related to optical technologies for outside plant	2020	here
Partnering for solutions: ICTs in Smart Water Management	2014	here
Resilient pathways: the adaptation of the ICT sector to climate change	2014	here
Greening ICT Supply Chains – Survey on Conflict Minerals Due Diligence Initiatives	2012	here
Review of Mobile Handset Eco-Rating Schemes	2012	here
Boosting Energy Efficiency through Smart Grids	2012	here

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ITU-T Recommendations

ITU-T L.340/L.74 (04/2008)