Supply Chain - Asset Maintenance & Rehabilitation
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Case Studies
(top left) Construction of tertiary treatment system December 2022, (top right) construction of tertiary treatment system May 2023, (bottom left) Construction of tertiary treatment system July 2023, and (bottom right) Construction of tertiary treatment system November 2023 - Courtesy of Morgan Sindall Infrastructure[/caption]
Construction of tertiary treatment system February 2024 - Courtesy of Morgan Sindall Infrastructure[/caption]
Fully constructed tertiary treatment system integrated into existing treatment works - Courtesy of Morgan Sindall Infrastructure[/caption]
Example of a Cubis Systems modular chamber and (inset) chamber being assembled at Leominster- Courtesy of Cubis Systems & Morgan Sindall[/caption]
For the smaller alkalinity MCC kiosk (not DfMA), it was decided that the kiosk would sit at ground level but as it still required access under the panel for installation, a below ground trench was required. To make the construction process more efficient, the trench comprised of innovative and sustainable HDPE recycled plastic modular units from Cubis Systems, that were put together on site and built around with minimal concrete surround and base slab and backfill to support the kiosk. As well as the material of the modular solution being more sustainable, it also led to a reduced carbon footprint in delivery due to it being very light weight. This also made it a safer and quicker installation as the manual handling involved was minimal.
Installation of DfMA low voltage distribution board MCC kiosk - Courtesy of Morgan Sindall Infrastructure[/caption]
New Fineguard inlet screens from SPIRAC Ltd with improved safe access for operators – Courtesy of Morgan Sindall Infrastructure[/caption]
(top left) Federated 3D model capture of sampling kiosk with tertiary filters - Courtesy of Arcadis, (bottom left) as built sampling kiosk with tertiary filters - Courtesy of Morgan Sindall Infrastructure, (top right) Federated 3D model capture of lift pumping station with tertiary filters - Courtesy of Arcadis, and (bottom right) As built tertiary filter lift pumping station pipework with duplex filter and tertiary filters - Courtesy of Morgan Sindall Infrastructure[/caption]
Lift pumping station - Courtesy of Morgan Sindall Infrastructure[/caption]
Installation of tertiary sand filters adjacent to railway line under agreed BAPA procedures - Courtesy of Morgan Sindall Infrastructure[/caption]
Leominster WwTW: Tertiary sand filters - Courtesy of Morgan Sindall Infrastructure[/caption]
Fully constructed tertiary treatment system integrated into existing treatment works - Courtesy of Morgan Sindall Infrastructure[/caption]
Google Maps - Location of King George V Reservoir[/caption]
Google Maps - location of site compound and works area[/caption]
Finished temporary road before track matting - Courtesy of MWH Treatment[/caption]
Finished installation of the track matting - Courtesy of MWH Treatment[/caption]
Reaction stand setup excavation - Courtesy of MWH Treatment[/caption]
Train moving a pile to the clamp crane - Courtesy of MWH Treatment[/caption]
(left) Aerial view of the project and (right) rising main failure - Courtesy of Caledonia Water Alliance[/caption]
Pipe delivery - Courtesy of Caledonia Water Alliance[/caption]
Assembly of overhead pipe bridge - Courtesy of Caledonia Water Alliance[/caption]
Bypass pit showing pipework cut out and a new ‘T’ piece and valve arrangement - Courtesy of Caledonia Water Alliance[/caption]
Liner installation - Courtesy of Caledonia Water Alliance[/caption]
Drone image showing the scaffold tower and the liner installation operation underway - Courtesy of Paul Milligan, Caledonia Water Alliance[/caption]
CCTV output pre and post lining - Courtesy of Caledonia Water Alliance[/caption]
(left) Condition of the spillway blocks prior to the works and (right) new concrete slab with stainless steel protection to the joint - Courtesy of Esh-Stantec[/caption]
Tunstall Reservoir dam - Courtesy of Esh-Stantec[/caption]
Tunstall Reservoir spillway - Courtesy of Esh-Stantec[/caption]
(left) View in the unlined section of the tunnel (notice the beams across the soffit) and (right) view of pipe inlet and partial headwall (notice standing water on the invert) - Courtesy of Esh-Stantec and CC Informatics[/caption]
Various options were considered during the Concept stage. The option of not filling the tunnel was disregarded as it would not eliminate the potential risk to the integrity of the dam embankment and spillway channel. Filling the entire extent of the tunnel was considered, however it was not preferred due to the significant constraints associated with it. These constraints include the difficult access and requirement to work in a confined space, potential land ownership issues, the presence of a SSSI immediately to the east of the abutment, and the increasing depth to the tunnel as it continues beyond the spillway. For all of these reasons, it was agreed with that filling the extent of tunnel beneath the dam and spillway would be sufficient as that would eliminate the risk to these structures.
(left) View of the geopolymer in the tunnel, and (right) view of the pea gravel stop end - Courtesy of Esh-Stantec and CC Informatics[/caption]
Overview of the siphon diversion route in preparation for the works - Courtesy of Esh-Stantec[/caption]
(left) Flood inundation modelling and (right) site location plan - Courtesy of Arup[/caption]
Western Breakwater Point Cloud model - Courtesy of Arup[/caption]
Settlers of Porthcawl - Courtesy of BlueCube Marine[/caption]
Western Breakwater construction works - Courtesy of Knights Brown[/caption]
Western Breakwater during Storm Diana - Courtesy of Keith Jones[/caption]
Overpumping pipework - Courtesy of @one Alliance[/caption]
Vanderkamp UK’s temporary overpuming pipework while OnSite Cental undertake the CIPP lining works - Courtesy of @one Alliance[/caption]
OnSite Central’s CIPP lining operation - Courtesy of @one Alliance[/caption]
Traffic management during the works - Courtesy of @one Alliance[/caption]
Customer information boards - Courtesy of @one Alliance[/caption]
omplex overpumping arrangement - Courtesy of Anglian Water’s @one Alliance[/caption]
Complex overpumping arrangement - Courtesy of Anglian Water’s @one Alliance[/caption]
The installation of the temporary pipework was a significant undertaking, and one that required close collaboration with Vanderkamp UK. Working together, the @one Alliance/Vanderkamp UK team considered sustainable solutions to mitigate flows and ensure the continued integrity of Anglian Water’s infrastructure.
Pipework and valve arrangement within the valve chamber – Courtesy of MMB[/caption]
The tunnel cross-section is a 2.4m diameter horseshoe shape. Access to the upstream end of the dry side of the tunnel is necessary to operate, inspect and maintain the new pipework and valve arrangement. The pipework arrangement and diameter needed to consider the ability to remove sections of pipework if required at a later date.
A long list of options were developed, however the chosen solution was to replace the twin 18-inch pipework with a single larger diameter pipe, offset to one side of the tunnel. This option maximised the outflow from the reservoir and maximised space for access, inspection and maintenance. To merge the two 18-inch pipe sections from the tunnel plug, an asymmetric manifold was designed to combine the flow, with guard and duty valves upstream of this. Enhanced releases are provided by two flow control valves installed offline to the new drawdown pipework, that could be remotely operated using a telemetry system located in a new control kiosk.
Other options considered during the optioneering included:
(left) Gate valve transportation and (right) bulkhead valves with concrete encapsulation - Courtesy of MMB[/caption]
Following the feasibility stage, the pipework system was further optimised to improve hydraulic efficiency whilst maintaining velocities to a suitable level. The manifold was optimised to achieve balanced flows between both legs, to prevent significantly higher velocities within a single leg. The results of the optimisations enabled the diameter of the larger pipework to be reduced from the initial proposal at the feasibility stage, leading to a reduction in material costs and embodied carbon by approximate 10%.
The diameter of the larger pipework was 800mm, and the flow rate measured in the commissioning phase was approximately 5m3/s.
Siphon and over pumping intakes - Courtesy of MMB[/caption]
Valve chamber and tailbay - Courtesy of MMB[/caption]
The historic valve house was demolished and replaced with a new buried valve chamber, and the tailbay was relined with a new reinforced concrete structure. This was due to the visual condition of the historic structures, to create a larger area for the new valve and access arrangements, and to facilitate the installation of the new pipework and valves.
The first task within the tunnel was to remove the three existing pipes. During the feasibility surveys it was found that the existing pipework and fittings contained asbestos, MMB commissioned a specialist asbestos contractor to remove the pipework adopting a pipe wrapping containment and use of a wire saw cutting technique. Once the pipework was removed all existing concrete pipe supports were also removed and the existing tunnel invert made good. Once all of the existing pipework had been removed up to the existing guard valves (at the tunnel bulk head), works to remove the existing duty valves and replace with new continued under client Gold Command control due to the single isolation nature of the works.
The works then progressed onto installing the new twin 450mm to 800mm diameter carbon steel pipework in tandem with installing a new level concrete tunnel floor. Due to the limited space within the tunnel and lack of lifting facility MMB used a small pick and carry crane which was able to transport the new pipework into the tunnel for installation. The tunnel was 180m in length with two 45° bends, this presented some construction challenges due to the limited flexibility in the flanged system.
The new valve house arrangement was then installed and incorporated the compensation, enhanced releases, and scour valves complete with extension spindle and pedestal arrangements for operation via electrical actuation on the new raised flooring arrangement.
[caption id="" align="alignnone" width="1200"]
(left) Scour pipework arrangement at the bulkhead and (right) scour pipework & thrust block - Courtesy of MMB[/caption]
Innovations
Bio Block - Courtesy of Cobra Hydro UK[/caption]
Examples of the results after Bio Block dosing – Courtesy of Cobra Hydro UK[/caption]
Mini CS & Company News
- Kent Reservoir - South East Water
Kent Reservoir - South East WaterThe challenge
The reservoir had an estimated 180 meters of cracks that needed repair, as well as the main element of the concrete that required coating to waterproof and add durability to the concrete structure. The reservoir was taken out of commission but it needed to be returned to service as soon as possible. To do this, we looked at the order of the processes to ensure the tight time frames could be met.The Xypex Solution
In accordance with the Reg. 31 IFU (Instructions For Use) all cracks were broken out to a minimum depth of 37mm and a width of 25mm. The walls were prepared by removing the laitance and the whole area was saturated. To stem the ingress of water, every crack that showed moisture was sealed with Xypex Patch’n Plug which sets in seconds stemming the flow. To meet the required time frame, the Xypex Concentrate coating work was then undertaken to allow it to air cure for the specified time. Once applied, the crystalline technology takes time to migrate deep into the concrete and become fixed within the concrete matrix as a permanent solution. When the curing is complete the coating could be removed if required, in this instance it remained. During the curing process of the coating, the crack repairs were then filled using Xypex Concentrate as a Dry Pack and then finally topped off with a thin layer of Xypex Patch’n Plug to enable the fast return to service. [caption id="" align="alignnone" width="1200"]
The Xypex solution; Concentrate and Patch'n Plug - Courtesy of SMR Projects Ltd - Xypex UK Distributors[/caption]
The results
The allowed time frame meant undertaking the processes out of the normal sequence, but this allowed the repairs to be to be delivered on time. The coating was undertaken to increase the durability but also to pick up any minor unidentified cracks. The larger cracks were repaired and sealed using the standard Xypex repair methodology, however ultimately over 300 metres of crack repairs were completed.
For more information: SMR Projects Ltd - XYPEX UK Distributors: +44 (0)1295 279747 | www.smrxypex.co.uk
- Phoenix Debris Mapping Tool
Phoenix Debris Mapping TooliNPIPE PRODUCTS™ Phoenix Debris Mapping Tool uses the latest hi-tech sensors to produce a highly accurate and detailed snapshot of a pipeline’s internal condition in real time.
Unlike competing systems that often take weeks to deliver post-pigging results, the Phoenix Debris Mapping Tool generates comprehensive reports within minutes from the data collected and accuracy down to 0.1mm. The award-winning company believes this revolutionary technology has the potential to save clients hundreds of thousands of pounds. Barry Ritchie, General Manager of iNPIPE PRODUCTS™ Aberdeen Service Centre said:"The Phoenix Debris Mapping Tool is a groundbreaking advancement, utilising the most advanced sensors in the industry. It captures up to 144,000 data points every second where required, delivering an unparalleled volume and precision of data across a pipeline network. This tool provides pipeline operators with a full 360-degree internal assessment, identifying everything from debris and damage to temperature fluctuations and internal joint measurements.
“The Phoenix Debris Mapping Tool truly gives both small and large, commercial pipes the ultimate MOT, ensuring you have the perfect pipeline picture that will provide businesses with peace-of-mind in knowing that money won’t be wasted during in-line pipeline inspections.”
Founded 40 years ago, iNPIPE PRODUCTS™ has established itself as a pioneering leader in pipeline pigging, maintenance, isolation, and testing products worldwide. The North Yorkshire-based company, with a service centre footprint based in Aberdeen has developed a comprehensive suite of solutions for industries dependent on pipeline networks, from energy and petrochemicals to food and water. The Phoenix Debris Mapping Tool is expected to be particularly beneficial in sectors like water, where aging infrastructure presents unique challenges. Simon Bell, Managing Director of iNPIPE PRODUCTS™, said:"The water industry has faced well-documented issues with leaks due to aging pipes made of materials like carbon steel, cast iron and even clay. Our technology enables us to map entire pipelines, providing vital data that can help locate and address problems before they become costly failures”.
As iNPIPE PRODUCTS™ continues to innovate, it remains dedicated to expanding its portfolio of cutting-edge solutions, ensuring clients benefit from a one-stop solution that enhances the performance and reliability of their pipeline assets.Benefits of PHOENIX Debris Mapping Tool
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- Debris location & pipeline route plotting
- Debris thickness measurement & visual inspection
- Internal joint measurement & visual inspection
- Damage/dent location, measurement & visual inspection
- Total volume debris calculation
- Temperature measurement
- Pre-commissioning visual & internal diameter datum study
- Pipeline cleaning regime validation & predictive calculation
- Scalable design accommodates 12” to 120” internal diameters
- Flow validation
- Immediate report availability
For more information on the Phoenix Debris Mapping Tool, visit https://www.inpipeproducts.com/
iNPIPE PRODUCTS™, Gatherley Road, Brompton on Swale, North Yorkshire, DL10 7JH | Tel: +44 (0)1748 813270
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- 42" Water Pipeline Cleaning
42" Water Pipeline CleaningiNPIPE PRODUCTS™ was commissioned to provide comprehensive pipeline pigging/cleaning services to a prominent civil construction firm, acting on behalf of a major client within the UK utility sector. Following a detailed review of project specifications and extensive consultation with the client, iNPIPE PRODUCTS™ executed a turnkey air pigging solution encompassing:
- Project management and engineering oversight.
- Development of pigging procedures and risk assessments.
- Provision of temporary launchers and receivers to facilitate seamless equipment.
- Manufacturing of bespoke pipeline cleaning pigs equipped with advanced tracking and internal camera recording capabilities.
- Supply of cutting-edge air pigging equipment.
42" pigs during pipeline cleaning operations[/caption]
To verify the cleanliness of the pipeline in real-time, a sophisticated camera pig equipped with video recording capabilities was deployed, providing the client with unequivocal confirmation of the pipeline's condition post cleaning.
In addition to manufacturing bespoke cleaning equipment, iNPIPE PRODUCTS™ provided a comprehensive air pigging equipment spread, including air compressors, manifolds, and silencers. Launcher and receiver pods were particularly designed and fabricated to seamlessly integrate with the cleaning process.
To ensure thorough pipeline cleaning, a series of specialised cleaning pigs were employed in succession, forming a pig train. The cleaning process began with a brush foam pig, accompanied by a 10m3 water slug, followed by a criss-cross foam pig propelled with air. Subsequently, a camera pig was utilized to meticulously verify the pipeline's cleanliness. Each pig was equipped with a transmitter for efficient pig tracking.
Operational execution was carefully managed, with a dedicated onsite operations team, including the project manager, site supervisors, and pigging operators, overseeing every aspect of the operation.
Mobilisation of personnel and equipment was executed promptly as per schedule, with meticulous coordination between our team, the client, and the asset owner.
The project concluded successfully, surpassing expectations by completing ahead of schedule and budget, iNPIPE PRODUCTS™ commitment to excellence and expertise in pipeline cleaning delivered a pristine pipeline network, exceeding client expectations, and promoting environmental conservation and sustainability.
Air Pigging Project Benefits
- Air pigging is a safe, efficient and environmentally friendly method to clean water pipelines offering significant benefits compared to traditional methods.
- Considerable reduction in carbon emissions, costs, time, environmental impact, fuel, traffic congestion and noise as well as supporting road safety.
- The system significantly reduces water consumption from traditional water jetting together with a comparable reduction in the amount of contaminated water needed to be disposed of.
- Sustainably cleaning method of pipelines with air rather than water, minimal water wastage and minimum disruption to the environment.
- Camera-Integrated Pig provides visual cleaning result verification in real time PRODUCTS iNPIPE™.
- Savings:
- 1,104 tanker journeys.
- 15 million litres of water.
- 118.2 tonnes of CO2 across the whole project.
For more information on the iNPIPE PRODUCTS™ air pigging technology, visit https://www.inpipeproducts.com/
iNPIPE PRODUCTS™, Gatherley Road, Brompton on Swale, North Yorkshire, DL10 7JH | Tel: +44 (0)1748 813270
- East Budleigh Culvert Re-lining
East Budleigh Culvert Re-liningEast Budleigh is a small village in East Devon, UK located about 2 miles (3.2km) north of Budleigh Salterton. The village features a bypass culvert, constructed in the 1970s. The culvert is approximately 280 metres in length, of Armco construction, oval shaped and constructed from corrugated metal sheeting (with a concrete floor laid over it during the last 10 years). The existing culvert was in a poor condition, with joints failing and large voids appearing in the material outside the culvert structure. These failures led to a small localised collapse in the road above during flooding in 2012 and there were concerns that in the future that a larger collapse could occur, causing a failure in the highway surface. It was decided that this culvert required structural strengthening due to minimal cover to the busy road above, and to maintain flows through the culvert in storm conditions. [caption id="" align="alignnone" width="1200"]
(left) Host pipe inspection and (right) site preparation - Courtesy of MDA Ltd[/caption]
Project scope
The Environment Agency employed Atkins to design the culvert rehabilitation, with Kier appointed as main contractor who in turn appointed specialist contractor Matt Durbin Associates to consult on rehabilitation options and carry out the work. Given that the location was a highly trafficked residential area with minimum cover to the road, it was decided that lining with a structural GRP segment lining system offered the best solution and Amiblu‘s NC Line, non-circular GRP Structural Relining system was selected for the project. In total some 300 metres of Amiblu NC Line Arch Shape liner, 2360mm wide x 1350mm high was manufactured to the required WRC Type II standard and ISO 16611. Amiblu’s application engineers worked in partnership with Matt Durbin Associates to understand specific performance criteria required in order to create the optimal shaped pipe to fit the needs of the project and production started in January 2022 at Amiblu’s Gdansk factory in readiness to commence February deliveries. The culvert meandered with the local water course, and on inspection for the design of the linings was found to include long radius bends which were designed for pre-manufacture so that they would install without issue on site. Despite the apparent loss of cross-section in the culvert the design and smooth internal finish of the linings ensured that the flow capacity requirements for the culvert would be met. Given the small village size and the traffic management requirements for the installation works, coordination with local residents and parish councils regarding the large deliveries to site was essential and worked extremely well. [caption id="" align="alignnone" width="1200"]
Amiblu NC Line 2360 x1350mm ready for installation[/caption]
Work commenced on site on 14 February with site preparation works. Installation into the culvert commenced in March. In total, all installation and annulus grouting operations were completed in just 8 weeks.
Amiblu’s NC Line provides structural rehabilitation to existing non- circular culverts and host pipes that have reached a point in their service life where the asset owner must decide to renovate or replace.
GRP pipe systems made by Amiblu maintain excellent long-term stiffness, corrosion and abrasion resistance and are engineered for 150 years‘ service life.
Project parameters
- Country: UK
- City: East Budleigh
- Year: 2022
- Application: Culvert reline
- Installation: Trenchless
- Technology: Amiblu NC Line
- Total length of pipe: 300m
- Nominal Diameter DN (mm): 2360 x 1350mm
- Nominal Pressure PN (bar): PN1
- Nominal Stiffness SN (N/mm2): As per design criteria
Supply chain
- Client: Environment Agency
- Contractor: Matt Durbin Associates Ltd
- Consulting engineer: Atkins
- Structural GRP pipe liner: Amiblu
Completed installation - Courtesy of MDA Ltd[/caption]
What they said
Daniel Gay, Project Manager for the Environment Agency:“From a client perspective, the GRP liner solution has provided a cost and time-effective approach to prolonging the asset life. We were hopeful to avoid any requirement for open cut solutions to minimise the impact to the local community and meet delivery deadlines. We also needed to ensure that the flood risk standard of protection was not altered to upstream or downstream receptors. The structural GRP liner allowed for a bespoke unit to be installed which optimised the culvert capacity to retain the flow performance and extended the life. The outcome of improvements to the culvert have reduced flood risk to 27 residential properties, significantly reduced future maintenance costs and health and safety risks to the public.”
Adrian Parker, Senior Project Manager, Kier:“This project is a great example of how accelerated delivery can be achieved under the Environment Agency’s Collaborative Delivery Framework. From identification of the scheme for fast tracking in June 2021, the scheme was on the ground in February 22 and complete by June 22. MDA have done a great job and thanks also to Amiblu.”
For more information: Amiblu UK | +44 (0)7786 013574 | www.amiblu.com
- Eradicating Wastewater Pump Blockages
- Raigersfeld Culvert Re-lining
Raigersfeld Culvert Re-liningKent County Council‘s programme of planned highways maintenance works to be carried out during 2019 – 2021 included strengthening works to structures such as the Raigersfeld Culvert situated beneath the A20 Ashford Road, Maidstone, Kent. Following on from previous culvert rehabilitation works for Kent County Council, Steadline Ltd. were once again commissioned to make the required improvements to an existing historical brick and steel beamed culvert which was showing signs of deterioration resulting the restriction of flow capacity. With the same project team comprising Steadline Ltd., BdR (Civil & Structural Engineering) Ltd. and Amiblu, a bespoke, non-circular GRP liner was designed with specific challenges to overcome, including:- Steel cross sections to the soffit of the culvert
- Inconsistent shape
- Traffic loads
- Restricted access
- Environmental considerations
Existing Raigersfield culvert - Courtesy of Steadline Ltd[/caption]
The result, 16m x 1m length sections, 1244mm x 754mm Eliptical shaped NC Line with a 27mm wall weighing just 175kg per metre with a push fit bell & spigot socket, was designed to maintain the required cross section and flow capacity.
Steadline Ltd and BdR (Civil & Structural Engineering) Ltd worked in conjunction with Kent County Council, to ensure all works were carried out safely and efficiently whilst meeting the requirements set out by the client in respect of strength, durability and finished aesthetics.
Forward planning of this scheme was critical as the culvert runs beneath the main A20 which is a major arterial route through Maidstone and a road closure was never an option, so the team at Steadline worked closely with park rangers within Mote Park to secure the downstream access and with residents of a gated housing estate for the upstream access.
The stream was damned and over-pumped with precautions in place to ensure that no unwanted debris found its way into the natural water course. The 1m long NC Line sections were then craned onto the upstream landing area before being installed using a purpose built roller system to accommodate for the inconsistent internal condition of the existing culvert.
Once all 16m of NC Line had been installed, grouting was carried out in stages as per Amiblu’s recommendations and the headwalls were finished in keeping with the original culvert construction.
Amiblu relining pipes are particularly suitable for pipe and culvert rehabilitation, as they are light in weight, corrosion resistant, quality assured, easy to install and engineered to give 150 years’ service life, they are manufactured in a wide range of sizes in both circular and non-circular options and with varying strengths to cater for all locations and performance criteria.
[caption id="" align="alignnone" width="1200"]
NC Line example shape options[/caption]
Amiblu NC Line pipes are produced to ISO16611. The non-circular cross-sections are ideal for relining and strengthening aging sewer networks, culverts and channels. Non-circular pipes are also used for open trench applications where capacity is required, but allowable depth to invert is limited. They can be customised according to project requirements and easily be adapted to different types of shapes and geometries.
Project parameters
- Country: UK
- City: Maidstone
- Year of construction: 2021
- Application: Storm sewer
- Installation: Trenchless
- Technology: Amiblu NC Line
- Total length of pipe: 16m
- Nominal diameter DN: 1244mm x 754mm
- Nominal pressure PN (bar): PN1
- NC Line shape: Elliptical (1m lengths)
Supply chain
- Client: Kent County Council
- Contractor: Steadline Ltd
- Engineer: BdR (Civil & Structural Engineering) Ltd
- NC Line relining pipe: Amiblu
(left & right) Finished Ragstone headwalls courtesy of Steadline Ltd and (middle) Amiblu NC Line Raigersfield design drawing - Courtesy of Amiblu[/caption]
What was said
Aaron Harber, Contracts Manager, Steadline Ltd.” All in all the scheme was very successful and certainly improved the flow of the stream/small river and with the new rag stone head walls looked very pleasing to the eye.”
For more information: Amiblu UK | +44 (0)7786 013574 | www.amiblu.com
- College Avenue Contact Tank
College Avenue Contact TankThe challenge
The South East Water contact tank has a constant output of 18.1 million litres per day, it contains water which is treated with Sodium Tripolyphosphate and sodium hypochlorite before entering the distribution network. The structure is of a ‘certain’ age and has a number of active leaks that have progressively worsened over time. As the tank is in constant use, it cannot be taken off-line and so a solution was required which could be undertaken against heavy flow of water with the tank still in use.The Xypex solution
Xypex not only likes water, but the repair method requires a wet environment therefore an active leaking tank is not a problem. The cracks were chased out in accordance with the DWI Reg. 31 approved Instructions for Use Document i.e. a minimum of 37mm depth and 25mm wide, following the line of the crack. Either side of the crack was cleaned and the laitance removed to expose the capillary and pore network. [caption id="" align="alignnone" width="1200"] The Xypex solution; Concentrate and Patch'n Plug - Courtesy of SMR Projects Ltd - Xypex UK Distributors[/caption]
A bleed pipe was installed and secured with Xypex Patch’n Plug at the lowest point of the crack where water flow was at its greatest. Then the base of the crack was plugged using Xypex Patch’n Plug to stop the flow of water. This was then left to see if there were any additional issues that manifested themselves over night. Once the flow was proven to have stopped, the repair was finished using Xypex Concentrate both as a dry pack and a slurry in line with the IFU and Xypex’s standard repair methodology.
The results
The Xypex methodology using Xypex Patch’n Plug stopped the flow of water instantly and allowed the repair to be undertaken. The crystalline chemistry within the Xypex Concentrate will migrate deep in to the concrete matrix around the repair, driving water out and increasing the life and durability of the tank in those areas. [caption id="" align="alignnone" width="1200"]
Courtesy of SMR Projects Ltd - Xypex UK Distributors[/caption]
As the original repairs were undertaken, additional pressure was transferred to other cracks that were visible, but not leaking, and these were all repaired using the same method.
In all, only 2 materials were used on site and no specialist methods were used. SMR Projects Ltd attended and were on hand for technical help throughout the installation.
For more information: SMR Projects Ltd - XYPEX UK Distributors: +44 (0)1295 279747 | www.smrxypex.co.uk
- Gipsy Patch Lane (Bristol) Sewer Rehabilitation
Gipsy Patch Lane (Bristol) Sewer Reh...Gipsy Patch Lane, Bristol is a main road forming part of a new Cribbs Patchway Metrobus route in South Gloucestershire. As part of an asset assesment programme a few years ago, a CCTV survey showed many defects throughout the length of the surface water culvert at Gipsy Patch Lane. The defective sections ran under the busy carriageway so, as an interim maintenance measure the local authority excavated a section of the road and installed a concrete slab over the pipe to protect it from further deterioration or collapse. During heavy rainfall over the summer of 2020, the same pipe was found to have suffered structural defects and root ingress through open joints and connecting laterals resulting in localised blockages of up to 90%. A new man-entry survey showed the pipe beneath the concrete slab to be deformed. Major works were already under way in the area to replace a railway bridge on Gipsy Patch Lane, so South Gloucestershire Council took the opportunity to make improvements to the sewer in conjunction with the Network Rail works to minimise disruption, which was further aided by lighter traffic due to the regulations set in place for Covid-19 pandemic. Under the Council’s Climate Resilient Scheme, the task was to find and deliver a suitable solution before opening the road up to traffic and risking a pipe collapse; two options were considered; open-cut to replace the section of pipe or trenchless technology to reline the affected pipe with little disruption to the area. [caption id="" align="alignnone" width="1200"]
First post-Brexit delivery of Amiblu pipes (January 2021)[/caption]
Doug MacKay, Project manager, South Gloucestershire Council consulted with Julian Britton, Critical Sewers Manager, Wessex Water and Matt Durbin Associates; specialist confined space and GRP structural relining installer to determine the most efficient and economic technique. As with many suburban roads, Gipsy Patch Lane is laden with many services within the carriageway, so rehabiliatation of the existing pipeline through trenchless installation of 210m x DN800 structural GRP jacking pipe supplied by Amiblu was decided upon. As the contract was classed as emergency works, subject to time constraints and speed of execution the use of Amiblu’s GRP pipes meant that MDA were able to remove the need for costly over-pumping and install the pipes in live flows, whilst minimising their work area to a single lane closure for uninterupted access to local businesses.
During the installation of the initial contracted 210m, a further 70m section of the pipe downstream required attention, so MDA undertook the additional works saving additional costs and disruption at a later date.
Amiblu jacking pipes are often utilised in pipe rehabilitation projects such as this as they offer a high compressive strength and, compared with conventional materials, an improved hydraulic coefficient. The hydraulic analysis carried out for Gipsy Patch Lane showed no reduction in hydraulic performance and as the pipes are designed to offer a service life in excess of 150 years with minimal maintenance, the life expectancy of this asset is greatly improved.
[caption id="" align="alignnone" width="1200"]
(left) GRP pipe installation and (right) the completed relining - Courtesy of MDA Ltd[/caption]
Doug MacKay, Project Manager with South Gloucestershire Council, commented:
"For this project, the Council had concerns about the risk of potential pipe collapse under traffic loading. The fact that road was already under a full closure due to an adjacent project to replace an old railway bridge meant that timing was critical for this project. It was essential that the work had to be completed before the proposed re-opening of the carriageway. Additionally, there was a limit to the funds available through the Climate Resilience budget to complete the scheme. We worked very closely with MDA and our designers to review the site constraints, risks to programme delivery and budget constraints to determine the most appropriate remedial solution. I was grateful for the time, input and patience spent by MDA during this period to explain the construction process and provide answers to all our questions and concerns in advance of making the final decision on the preferred option.
Once the decision was made to proceed with the pipe-jacking option the process was relatively straight-forward and stress-free from the Council side of things. In the main this was down to the excellent communication, planning and execution of the works by MDA. Both projects were completed on-time, within budget and with minimal disruption to the public and businesses that rely on using Gipsy Patch Lane.”
[caption id="" align="alignnone" width="1200"]
Amiblu pipes require minimal site storage - Courtesy of MDA Ltd[/caption]
Project details
- Country / city: UK, Bristol
- Year of construction: 2021
- Installation time: 4 weeks
- Application: Sewer rehabilitation
- Installation: Trenchless technology
- Technology: Hobas
- Total length of pipe: 280m
- Nominal diameter DN (mm): DN800
- Nominal pressure PN (bar): PN1
- Nominal stiffness SN (N/mm²): 32,000
Supply chain
- Client: South Gloucester Council
- Contractor: Matt Durbin Associates Ltd
- Consulting engineer: South Gloucester Council
- Structural GRP jacking pipe: Amiblu
Amiblu Structural Relining Pipes
Amiblu pipes have a smooth, resin rich internal surface with high abrasion resistance which consistently prevents fouling and build up, leading to low maintenance costs and high flow rates even at low gradients. Both Jacking and relining pipes are supplied with in-line flush joints which prevent the intrusion of roots and further ensure the integrity of the asset. Available in diameters from DN300 to DN3600, in varying strengths and lengths. Amiblu’s systems are cost effect, durable alternatives to traditional pipe systems.
For more information: Amiblu UK | +44 (0)7786 013574 | www.amiblu.com
- Blairlinnans Water Main
