CASE STUDIES

Ystrad Mynach Sewer Cleaning

Due to flooding of nearby playing fields, Drainforce were tasked to establish siltation levels within 425m of large diameter bifurcation sewer upstream of a CSO.

Pre CCTV quickly verified that the sewer was drastically under capacity due to silt levels up to 75%. With the location of the sewer being through dense woodland, what would have been a routine job quickly escalated into a more complex operation. 

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DWR CYMRU WELSH WATER WITHYBUSH

Drainforce stop major pollution and disruption under a river, with a damaged sewer which was thought to be un-lineable.

Drainforce were tasked to complete structural liners on a pollution risk site of 174m of 225mm pipe, running close to and under a river.

The pipe in question had grade 5 structural defects running the entire length of the pipe.

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Drainforce complete the longest UV Liner in the UK, at Foss Las Race Course Llanelli, curing 300m of 225mm pipe in one single length!

Drainforce were tasked to resolve infiltration gushing into the sewer system at Foss Las Race Course, Llanelli. The pipe in question was a 225mm clay pipe, approximately 570m long.

Through pre-site investigations and meetings, we highlighted all the manholes which had infiltration.

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During cyclic desilting, Drainforce’s warthog jet had become buried outside of a 225mm pipe 2.5m deep, on a foul sewer outside a busy commercial and pedestrian area.

Drainforce used its robotic cutter to cut the jet hose free from the warthog.

Due to the depth of the pipe, Drainforce were tasked with installing patch repairs on the defective area.

During quality checks on site and on completion of a post survey, it was identified that the whole pipe (75m) was severely defective with continuous grade 5 defects along its full length.

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Drainforce were tasked with slip lining a 550mm box culvert 8m deep under a Network Rail Railway Track.

The Culvert in question is 21m long had a full collapse at 17m.

Due to the collapse, it was not possible to get bursting Rods through the sewer and drilling was not an option.

Drainforce provide a solution with use of its Robotic Cutters feeding through a wire rope to allow SDR17 450mm pipe to be winched into position using a 10t winch.

Large invert slabs had fallen from the invert which would of wedged the pipe and stopped the pipe being winched into position.

Our Robot was used to drill into the slabs cutting them into smaller sections to allow our 32t recycler to jet out the debris so there was a clear and clean run to winch the pipe over.

The SDR pipe was fusion welded with a slip trench to feed the pipe into the culvert.

A 10t winch was positioned on the down stream section with Rollers drilled into position to allow the pipe to be pulled through.

Health & Safety

Drainforce had Zero incidents during the project.

Staff Competence
All of Drainforce Staff comply Network Rail standards and RISQS.

Quality Assurance
Drainforce are ISO 9001 and 14001 certified. We continuously monitor and improve our quality of services to this contract through the following points

Collaborative Working
Drainforce worked with the client successfully and the local community.

Plant and Equipment
Drainforce made use of it’s high powered recyclers that enabled suction from a far distance and their specialist raft system to CCTV the culvert.

All Equipment was less than 80dbs complying with Council noise regulations.

Drainforce were tasked to clean over 2000 gullies and manholes on a full lane closure over 7m long between JN38 and JN42 of the M4. The road closure included all slip roads and all lanes.

Drainforce deployed 4 trucks to complete the works ranging from our bespoke 18t high volume Jetvacs with increased suction (1500cfm) to our state of the art recyclers. All work was completed on our bespoke mapping software with real-time updates.

Drainforce were asked to complete a CCTV survey of a 450mm trunk sewer to identify any defects and possible root ingress downstream from a combined storm overflow.

The sewer lays beneath a high-speed road and is running at constantly 80% flow. To allow progression of the survey, complex traffic management measures were needed, and the flows needed to be stopped and over pumped.

Our innovative approach meant that the survey was completed quicker than expected with the desired result for our client.

DRAINAGE ASSET MANAGEMENT OF WELSH TRUNK ROADS

The Welsh Government engaged with Drainforce Ltd to work with them to develop a system to collect and manage their drainage assets across their strategic road network.

Managing asset inventories, collecting asset conditions and have a centralised platform which has given them the ability to increase their understanding of assets to offer a better service to the public.

GULLY MAPPING

Syphon Removal with Robotic Cutting

Problem:

Removal of 100mm in-line Syphon and repair Syphon void.

Solution:

Drainforce have successfully completed their third trial of removing syphons with the use of robotic cutters. The process involves the use of robotic cutting techniques and patch repair technology. The concept was first trialled above ground in a mock situation whereas a 225mm syphon was cut and patch line repaired. 

Working with key clients we then progressed onto a live site and successfully removed a 150mm syphon and replaced with a 1m long patch repair. The third trial took place on the 24th of August where we were asked to remove an inline 100mm syphon at a depth of 2m beneath the boundary wall. The syphon was cut out and patch repaired in just six hours. 

Barkingside design & clean

Problem:

Defective pipe UTX drain and headwall that was becoming unstable along a LUL banking. The pipe in question was a Surface Water Pipe 900mm x 25m.

Solution:

We cleaned the culvert with recyclers which have a high volume of water ideal for removing large volumes of silt from the culverts and set up over-pumping and delivered the 5t liner to site though specialised track cranes.

CALDICOT MANHOLE COATING

Problem:

We were engaged for this project based on relevant experience in flow-management and access maintenance.

Solution:

Drainforce completed complex overpumping enabling works to allow the flows to be managed and to facilitate the manhole coating sealing and lining of 71m of 375mm combined sewer.

Problem:

Sewer blockage and impaired access.

Solution:

UV lining, pre-start checks and CCTV surveying identified a defect that required excavation. The location of the defect was repaired by the installation of a new manhole, which also benefited the project providing access into the culvert to complete the UV lining installation.

BLUESTONE UV LINING

Problem:

Drainforce were engaged to resolve a problem with the foul system for the Bluestone Resort, West Wales. The system was overloading and therefore, non-compliant.

Solution:

Our approach was to reduce the system infiltration through a mix of UV Lining and MH Sealing; using lining though MHs where infiltration was gushing and to divert connections to other manholes.

This meant we could line though specific manholes with a high level of infiltration ensuring they were fully sealed, and resolving the issue.

URGENT PUBLIC SEWER REPAIR, PONTYPRIDD

Problem:

Drainforce were engaged to investigate and develop a non-dig repair solution on an historical problematic sewer on sump in a combined sewer. 

Solution:

An initial spot repair was completed where the sewer had collapsed, the excavation was adjacent to two high pressure water mains and a high-pressure gas main, and the main valleys feed for HV electricity and Fibre optic line.

A plan of multiple overpumping of the sewer was set up, initially CCTV identified that 6 felt patches were put in place by another supplier were defective. We removed the defective patches by robotic cutting.

EASTERN VALLEY TRUNK SEWER FLOOD

Problem:

A 700mm diameter trunk sewer was found to be discharging and causing serious flooding to a local business yard and premises.

Solution:

First step was to deploy our 32t Dirty Water Recycler to attempt the jetting and removal of any obstructions. There was an obstruction that we were unable to move, so a visual inspection was required.

Due to the huge flows present within the sewer, CCTV was not possible without over pumping. This was achieved with the use of two large diesel pumps and over 250m of delivery pipe.To remove the roots and the debris we utilised our robotic cutting rig to cut away the roots and debris thus allowing us to jet out the wheel and clear the blockage.

NEWPORT FLOODING

Problem:

Drainforce were commissioned by Newport Council to investigate and rehabilitate a section of Gravity Surface water drainage runs at Pencarn Way, Newport. The area had a historical issue with ponding water and flooding. We completed pre CCTV investigations identifying roots and debris in the sewer and obstructions in the lateral drains from the gully’s running into the carrier pipe which was the main issue of the flooding in the area.

Solution:

We used high-volume jet-vacs to clean the area, then used robotic cutting to clear roots and obstructions. Excavation was required to expose the pipe due a defect, then we were able to re-line the pipe.

Vale of Glamorgan Council 

Problem:

Drainforce Ltd have just successfully completed a major UV lining rehabilitation project on a major Surface Water Culvert in Barry. (1250mm) The culvert was initially blocked causing flooding issues and had a sewer running through the crown, causing several structural issues. The line was also 30% full of concrete.

Solution:

Drainforce deployed their Recyclers, Robotic Cutters and UV lining Rig to rehabilitate the Culvert following an agreed design.

Colwinston UV Lining and Shingle Blowing

GLANNANT

GULLY MAPPING

Drainforce have selected this as its identical Highway Drainage works on a different theme.

Drainforce are successfully completing a 24/hr 7 day per week exclusive reactive maintenance Drainage contract for Neath and Port Talbot Council over the past year delivering cost savings and innovation and efficiencies safely on site. We have also recently been successful in securing the East Section with the help and aid of our new Vehicles and mapping systems.

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