PIP/Specific Operations/TBT-PIP-010

Under-Road Pipe Crossings

Pipelines & Pipework › Specific Operations › Under-Road Pipe Crossings

Presenter		Project
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Under-road pipe crossings install pipes beneath carriageways using open-cut trenching or trenchless methods.
Open-cut crossings require full road closure or lane restrictions with Chapter 8 traffic management.
Trenchless methods include auger boring, thrust boring, pipe jacking, and horizontal directional drilling.
Existing buried services are concentrated beneath road surfaces, increasing the risk of service strikes.
Traffic loading on backfilled trenches can cause settlement and road surface failure if compaction is poor.
The New Roads and Street Works Act 1991 requires a permit and notification before breaking the road surface.
Reinstatement must comply with the Specification for Reinstatement of Openings in Highways (SROH).
Working in live carriageways exposes operatives to vehicle strike risk throughout the crossing installation.
Night working may be required on busy roads to minimise traffic disruption during the crossing.
CDM 2015, NRSWA, and the Safety at Street Works Code of Practice all apply to pipe crossing works.

Vehicle strike	Workers in live carriageways installing pipe crossings are struck by vehicles, causing fatal injuries.
Service strikes	Roads contain concentrated buried services. Excavating without detection causes gas leaks and electrocutions.
Road failure	Poorly compacted reinstatement collapses under traffic, creating dangerous road surface defects and legal liability.

Don't

Obtain a NRSWA permit and notify the highway authority before starting.
Install Chapter 8 traffic management before any carriageway work begins.
Locate all buried services using plans and CAT scanning before excavation.
Compact reinstatement layers to SROH specification to prevent road settlement.
Consider trenchless methods to reduce traffic disruption and open trench risks.
Brief the team on the traffic management plan and escape routes daily.
Use night working on busy roads to minimise public traffic exposure.
Hold valid NRSWA competency cards for all operatives working in the highway.
Protect exposed pipe ends and open trenches with barriers and lighting overnight.
Record reinstatement layer depths and compaction test results for the permit close.

DON'T break the road surface without a NRSWA permit and service detection.
DON'T work in live carriageways without Chapter 8 traffic management in place.
DON'T excavate within the service exclusion zone without hand digging procedures.
DON'T backfill with materials that do not meet the SROH reinstatement specification.
DON'T leave open trenches in the carriageway overnight without barriers and lighting.
DON'T compact reinstatement without testing to confirm the required density is achieved.
DON'T allow workers in the carriageway without NRSWA competency cards.
DON'T ignore traffic management failures; stop work until protection is restored.
DON'T assume trenchless methods eliminate all risk; surface works still require controls.
DON'T close the permit without confirming reinstatement meets the required standard.

See also: Pipeline Safety Awareness | Chapter 8 Signing and Guarding

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