The structures toolkit defines four maintenance strategies (ie planned preventative, planned to do minimum etc). Each maintenance strategy outlines maintenance action and trigger conditions for each material type (and exposure). Please refer to Section 6a and Section 6b of the Structures Asset Management Planning Toolkit, Part C: Supporting Information for further details.
London Strategies
LoBEG and TFL have further refined the above "National" strategies by adding minimum threshold conditions for the intervention triggers based on element importance levels. These revised strategies are called "London Strategies" (London planned preventative, etc) and are available on BridgeStation.
The below table defines intervention triggers and rules based on element importance for each London strategy.
| London - Planned Do-Min | London - Planned Targeted | London - Planned Preventative |
| Element Importance | Intervention Triggers | Comments | Intervention Triggers | Comments | Intervention Triggers | Comments |
| Very High | 4D |
| 4B |
| 3C | Exposure is set to protected post maintenance where applicable |
| High | 4D |
| 4B |
| 3C | Exposure is set to protected where applicable |
| Medium | 5B | Intervene only in combination with Very High or High importance elements | 4B |
| 3C |
|
| Low | 5B | Intervene only in combination with Very High or High importance elements | 5B | Intervene only in combination with Very High or High importance elements | 4B |
|
Article ID: 319, Created: 11/1/2022 at 10:08 AM, Modified: 3/24/2025 at 2:32 PM