Culvert Repair at Harwood Brook, Great Harwood - Manholes B2 to B3 relining. M165

Client
Environment Agency

Project
Existing culvert repair from manhole B2 to manhole B3 relining

Description

culvert works

Following CCTV and man entry surveys to assess the condition of the stone culvert it was noted that a section of the culvert upstream of B_MH2 was in a dilapidated state and required repair over a 63m length to bring it up to an acceptable standard.

The dilapidations consisted of many natural masonry soffit stones exhibiting mid point failure cracks and some being afforded support by badly corroded steel rail sections.

The existing culvert has an internal cross sectional size of 1000mm high x 900mm wide.

The water flow within the culvert ranges in depth from 50mm in dry weather up to 300mm during periods of high rainfall.

Access to the culvert is via B_MH2. This manhole is situated on the edge of a petrol station forecourt and directly adjacent to the access route to the drive through car wash. The manhole has an opening size of 600mm x 600mm and a depth of 14m from ground level to the base of the culvert.

Particulary Difficulties

  • Very small access opening - 600mm x 600mm
  • Very deep access manhole - 14m
  • Constant wet working - flows cannot be over pumped
  • Confined space working
  • Very small surface working area
  • Dense built environment above culvert route
  • Manual handling in a small space
  • Insecure existing structure
  • Commercial constraints - must be a cost effective solution
  • Coal tar ingress upstream of working area
  • Repair must be durable and provide long duration, maintenance free service
  • System must not substantially reduce the existing cross sectional area

Solution - use multi-sectional GRP linings with a grouted surround, which provides the following benefits:

  • Can be bespoke manufactured to suit the specific requirements
  • Individual pieces fit through the access hole
  • Lightweight
  • Very strong
  • Easily transported from the storage area to the small surface working compound
  • Easy to handle and erect within the culvert
  • Individual pieces can be passed upstream through completed liners
  • Durable
  • Chemically resistant
  • Very smooth
  • Cause very little reduction to the cross sectional area
  • Can be erected and grouted without over pumping.
  • Stops exfiltration and infiltration

Following all party approval of the proposal, the works on site commenced on the 14th November 2011 and were finished just before the Christmas Break.

Ground Conditions

Clay overlying weak sandstone

Study Project Date  
Culvert Replacement at Lund Terrace FAS, Ulverston UTX, Cumbria. M240 03/04/2017
Grounting of redundant Fuel Pipelines, Fradley Junction, Staffordshire. M223 05/12/2016
Timber Heading at Seaborne Library, Chester University. M230 15/11/2015
Culvert Replacement and Repair at Ferryhill. M228 07/09/2015
NGN Grouting of Vacant Sleeve Annuli. M223 09/03/2015
Culvert Refurbishment at Shaw Brook. M220 02/03/2015
Culvert Repair at Winnings, Newcastle upon Tyne. M211 16/06/2014
Culvert replacement at Ellergill Culvert UTX, Nethertown, Cumbria. M197 02/09/2013
Culvert Replacement at Willowburn, Alnwick. M195 01/07/2013
Culvert works at Jepsons Clough, Horwich, Bolton. M189 04/02/2013
Culvert Repairs at Millfield Lane, Walbottle, Newcastle upon Tyne. M186 02/07/2012
Culvert Replacement at Antley Syke, Accrington. M182 29/06/2012
Culvert Repair at Harwood Brook, Great Harwood - Manholes B2 to B3 relining. M165 30/11/2011
Culvert Refurbishment at HIRPS, Hockery Brook, Hindley. M171 01/04/2011
Culvert Repair at Harwood Brook Culvert Lining and retaining wall, Great Harwood. M165 31/01/2011
Culvert Repair at Riley Lane, Kirkburton, Huddersfield. M152 30/04/2010

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