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Wildlife crossing major roads are always at risk of being killed. The A422 brick arch bridge over the Farthinghoe stream in South Northampton was in need of urgent repair and strengthening to accommodate fire engine & traffic loading up to 40 tonnes.
Following discussions with the EA, a requirement to provide both a structural solution and to accommodate safe movement of mammals including otters through any new structure was required.
The bridge was constructed of a skew brick arch section, which had previously been repaired, but this was now failing, along with signs of radial cracking occurring. The bridge had been extended in 1971 with a corrugated steel arch which was also now showing signs of corrosion. The structure is shallow, 15m long with a flat invert and straight walls, which arches across to a height of 1816mm with a span of 3000mm.
Due to operational restraints on this structure, a bespoke prefabricated GRP segmental liner was chosen as the most cost effective, nondisruptive solution with a 100 year design life. Working with our partners Channeline International (manufacturer of the GRP units) a profile with a 48mm thick liner incorporating a 500mm mammal ledge/shelf was designed and accepted by all parties involved.
These units normal take 8 weeks to be manufactured and shipped by sea to the UK once the dimensions and profile of the units have been verified. However, because of local pressures from the residents and local Authority, it was decided to air freight the units from Dubai to the UK hence reduction the delivery time by 50%.
Following digging out of the riverbed and installing a new gravel bed, our installation team successfully installed and grouted the GRP units, all within a 2 week period.
Another very successfully completed job undertaken to structurally repair a bridge and help to look after our wildlife friends.

Culvert renovation by CIPP Lining on the Isle of Skye

A client had a problem with some severely corroded 900mm diameter ARMCO culverts vulnerable to possible collapse, on the A87 into Isle of Skye. Road closure would have caused major disruption to both the local community and tourism on the island., We designed and installed a fully structural 14mm thick liner in 2 days with only a single lane closure required.

With a cure rate of appropriate 1m/minute possible the work was completed successfully to the satisfaction of the client and with no disruption to the residents – another happy client.

We installed a world record 30mm thick GRP UV cured in place liner in twin 900mm x 1400mm culverts. The original brick structure was failing with radial cracking and missing bricks and with very high replacement cost/severe disruption that would have been caused by the traditional replacement option, a trenchless solution was proposed by ourselves and accepted by the client.

Designed by iLine to provide a fully structural standalone liner to carry loads in accordance with BS EN-1991-2.2003 Eurocode 1-Traffic loads on bridges CIPP in this case 195KN/m2. Work was carried out in one week and at only 20% of the traditional replacement costs with no road closure necessary resulting in no disruption or environmental impact by our work.

iLine Technologies recently completed a single 1900 x 2100mm culvert project (GRP Lining) in the United Utilities region. The client specifically required a box-type GRP liner, including all the design & feasibility. Having all the relevant technical expertise, iLine were in a very strong position to deliver a suitable solution, that met all the needs of the end user, within the tight programme that was vital to minimize the environmental disruption that was being caused by the failing brick culvert.

Following the rigorous design process, to ensure that the culvert could withstand the eccentric & unpredictable loadings from the surrounding ground, iLine opted for a traditional, thick-section GRP segmental liner, manufactured by our partner in the Middle-East; manufacture & shipping time was reduced to 4 weeks, enabling a fast-turnaround scheme, and prompt completion.

The GRP sections were delivered to site in Lancashire during the latter end of August 2015, and installed using traditional hand methods, which provided a flexible & speedy process. The site team consisted of 5 men, very experienced in all things trenchless, but specialising in GRP. The prefabricated units, each 2.4m long were installed & jointed within a 4 day period. Following joint checking, the segments were grouted into position, using a standard, low-strength cementitious grout, and the culvert tested, commissioned & re-introduced to service.

Trenchless technology comes in many shapes & forms, some new, some old, but none more traditional & effective than GRP segmental lining. The technique has been around for many years, but is only facilitated by the few specialist companies that have the right operational staff, experience & know-how to deliver the right results. Another successful project from the team at iLine!

For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

Another GRP Lining Success for iLine in the East Midlands

Frequently, our clients contact us with a specific culvert problems that they may have, and these problems can often seem insurmountable. Such was the case when iLine were approached by the Rail Operator with a problematic & failing open-ended brick arch culvert in the East Midlands region. As the culvert in question was a critical structure, carrying high flows and providing structural stability to the rails, a solution needed to be found that could provide long-term stability to the supporting ground, whilst meeting all environmental and safety KPI’s, but remaining within the cost-framework. The actual location of the culvert was within an SSSI (site of special scientific interest), heading out under the railway, with the end-access point located in a private land area.

In conjunction with the Network Rail framework contract arrangements, iLine Technologies developed a GRP solution feasibility, and produced the design & construction works to meet all of the targets set by the client. After mobilisation, and following the intense cleaning process, several major structural defects were identified within the superstructure, and the design was subsequently adjusted to suit the new parameters.

iLine pre-rehab Culvert


As the culvert was an 1800mm x 2000mm section (which is a size that is not available in the UK), the GRP units were manufactured in the middle-east (using a bespoke one-off mould), and shipped to England within the specified 3 week lead-in period. As the culvert required multiple flow diversions, the overpumping system that was installed by iLine was more complicated and involved than that of a standard culvert, but with the assistance of our specialist supply chain, an effective solution was devised that coped with all the flows, thus alleviating the risk of the embankment being scrubbed away.

The iLine specialist operatives then installed the GRP segmental units over a 3 day period, completing the jointing, alignment and final checks prior to the commencement of the grouting process, which involved the use of a special PFA enhanced grout, installed by traditional methods. On completion of the grouting process, the culvert was given a final clean-through, with the final CCTV & walk-through inspection taking place prior to final testing, commissioning and handover.

iLine post-rehab Culvert


For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact Nick Sheehan or John Beech at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

Historically, guided augerbore has been an extremely popular technique with the rail authorities & contractors, as it can install underground pipes, with virtually no ground displacement, and thus it vastly reduces the risk of ground heave or settlement, thus minimising track movement risks, which could create safety issues.

One of the key trenchless services provided by the management team at iGroup is guided augerboring (also known as ‘thrust boring’). This technique has played a vital role in the development of trenchless technologies, and over the years, many underground pipes have been installed using this tried & trusted methodology.

iDrill Augerboring


Network Rail approached iDrill Technologies to develop a solution for an ‘under track crossing” (UTX) in Northumberland, to install a new steel culvert drainage pipe of 600mm nominal diameter, under a set of high speed railway lines. iDrill were successful in the tendered feasibility process, and commenced with the in-house design works during June 2015.

As always with UTX crossings (as with any type of tunnelling), ground information holds the key to success, and thus specialist geotechnical consultants were engaged to prepare the heave & settlement calculations that underpinned the Network Rail Construction Forms. The maximum ground movement was forecast to be less than 5mm, which is well within the strict guidelines offered by the end-user.

All works were to be installed during formal possession periods, which were planned several weeks before the construction phase; iDrill, with the help of it’s strategic partners, piloted, augered and installed the pipe well within the available programme window, and well within the ground movement tolerances available.

iDrill Augerboring


Following completion of the installation of the steel sleeve, iLine Technologies attended site (not under possession) to line the steel sleeve with a 4.2mm thick UV-CIPP liner, prior to final handover of the pipe to the end-user. Another successful project by the iGroup family, delivered on time and within budget.

For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact John Beech or Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

iLine’s Large Diameter CIPP lining process heads to the North East

When a blue chip client gives a call to ask if you can help them with a series of emergency rehabilitation schemes, we are definitely the company that likes to say yes! One of the schemes was a large diameter culvert, carrying a water-course under a pair of high-speed rail tracks, that was severely degraded, and was in need of urgent repair to avoid a total collapse.

The 900mm diameter pipeline ran from a standard 1800mm manhole to a collapsed downstream headwall. The main issue with the repair was that the tracks could not be closed, and could only be accessed under a very limited rail possession of Saturday night (20:00 – 06:00). This restriction in the programme caused a real limitation on the techniques that could be employed to repair the pipeline. Fortunately, the UV process pioneered by iLine Technologies delivered the optimum solution, whilst complying with all programme restraints.

iLine CIPP LFC


Prior to the possession period, the collapsed headwall was dug out using a vacuum excavator, to assist with speed, efficiency and programme. This process was immediately followed by the pre-CCTV & cleaning process, after which the UV lining equipment was mobilised. The 25-metre long liner was winched into place using iLine’s specially designed 4 tonne hydraulic winch, and then inflated using our proprietary blower unit. Following the secondary (check) CCTV, the UV robot was inserted into the pipe, and the liner was cured at a speed of 08m/min. Following completion of the lining process, the pipe was re-CCTV’d as a final check, then the annulus was grouted prior to the possession handover back to the rail operator. Another success from the UK’s #1 team at iLine Technologies!

iLine CIPP LFC


For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact John Beech or Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

iLine’s UV Technology heads to the West Country

It’s always nice to tackle a series of unusual or difficult sites, which is exactly what iLine were faced with, when they were asked to use their flagship UV-CIPP process to rehabilitate 3 large diameter (i.e. over 1m) culverts in the West Country.

The three culverts in question were constructed from a variety of materials, and were in a various states of disrepair, nominally grades 3 and 4; additionally the locations of the three culverts were remote, thus requiring a more comprehensive planning process than your average urban pipeline.

iLine CIPP


As iLine were engaged to provide a full ‘BIM’ turnkey design & build process, a feasibility study was initially undertaken, to assess all factors of the scheme, and to complement the development of the Health & Safety file. As the design process was undertaken, and different site conditions depicted different loadings, it was felt that each of the culverts required a detailed study to ensure full compliance & longevity of design. As such, each of the culverts were individually assessed, which in turn delivered cutting edge designs for each site, whilst making considerable cost-savings for the client.

Very often, iLine are asked if there are any issues with culverts that aren’t circular in cross-section; to clarify this point, our UV process can reline culverts and pipelines of virtually any shape, whether round, oval, square, egg etc. Within the confines of this particular rehabilitation scheme, iLine installed 1*circular, 1*egg and 1*oval section, using liners that varied in thickness from 9mm to over 16mm.

iLine CIPP


For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact John Beech or Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

After a great end to 2014, iLine is quite literally going from strength to strength during Q1 & Q2 of 2015. At the end of AMP5, the wider water & sewerage sector is looking particularly buoyant, which is a breath of fresh air after the normal downturns that the whole industry experienced at the end of AMPS 3 and 4.

The CIPP lining sector has got off to a fantastic start, with a huge range of liners being installed, in diameters up to 1600mm, from John O’Groats to Lands End! Together with the addition of our recently secured framework contract with Welsh Water / Dwr Cymru, the outlook is looking particularly strong for the AMP6 5-year regulatory period. Our clients are constantly striving for a quality product, installed by a competent, no-fuss contractor, at competitive rates, and iLine tick all of their boxes, demonstrated by the ever-increasing amount of repeat business from our growing client base.

Our pre-fabricated GRP lining division is also on a rapid growth path; we have seen a 38% increase in the quantity of UK installations carried out by iLine over the last 12 months, and it is giving no signs of slowing; this is also bolstered by the advent of an increasing number of overseas collaborations – watch this space!

To support our current accreditations of Builders Profile, CHAS and Constructionline, iLine has also recently achieved a 100% clean-sweep in the RISQS audit to gain Linkup status, which will further strengthen our rail division, and provide that vital confidence and accountability to our blue-chip clients.

For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

iGroup – 2015

After a few manically busy weeks, it’s time to get back down to basics, so here’s a little flavour of what’s going on in the world of iGroup in Q1.

Despite the water industry concluding it’s 5-year ‘AMP5’ periodic review, work in this sector has been more buoyant than ever, which is ultimately a testament to the years of hard work that industry organisations such as the SBWWI and UKSTT and have put in, to get the water companies and Ofwat to respond to the many concerns that the industry has raised over a fluctuating periodical workload. Both end-users and main contractors alike have produced noticeably more opportunities than in the previous 2 AMP’s.

The CIPP lining sector has been particularly busy, with over 100 pipelines being rehabilitated by iLine during the period, many of which have been in the water sector, with a high proportion of larger diameter installs, from circular, square, arched and a whole host of other bizarre profiles! Whilst the UV methodology remains the strongest performer, iLine have also installed many ‘traditional’ hot-cured liners, thus consolidation our flexibility to consistently meet the needs of our customers. A special big shout-out & thanks goes to our key team-players Martin, Gareth, Alex, Stuart, Dai, Adrian and Andy, who have consistently gone the extra mile, and demonstrated an unconditional commitment to the business.

iLine CIPP – UV


Directional drilling has also got off to a great start, with a wide variety of underground pipelines being installed, many for the ever expanding renewable energy sector, where iDrill are able to deliver full turnkey services for the end user. The main focus in 2015 so far has been on the medium to large diameter sectors, with a strong emphasis on steel & polyethylene installations.

The appetite for thrust boring (aka guided auger boring) also remains strong, with 11 installs being carried out during the first quarter; this technology still remains a highly competitive mechanism for new pipeline installs, where line and level are of a critical nature.

The outlook for Q2 and the rest of 2015 remain very strong in all sectors across the group, with an ever increasing order book, planned investment in new plant & equipment, and a strong growth plan. Bring it on!

For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact Nick Sheehan at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.