Have your say! Send your exciting news to
info@draintraderltd.com
A full length view of one of the downpipes in need of repair.
scaffold that had been previously erected for other building works by the main contractor. For some of the liner installations, however, the work was undertaken from a scissor lift.
These unusual circumstances posed significant challenges for S&D but careful consideration of the situation led to the development of rather unusual but safe methods of working which was a paramount focus given that the lining team would be working at height.
The operation was also time-limited because it required a footpath closure to maintain safety for passers-by and further to this, access for the lining team to site was only available between 07.30 and 17.00 on lining days, a limit that had to be strictly adhered to because of client demands. Even given these restrictions, the use of the Brawoliner system with the fast cure Brawo 1 resin enabled the S&D team to install up to three liners a day.
To minimise the impact of the works on the functioning of the College, the work was undertaken in two parts. The first part comprising the bulk of the lining work was undertaken over the 2015 long summer holiday break. The remainder of the linings were completed during the half term break in October 2015.
Whilst individual liners presented different challenges due to the variation in sizes and shapes over their lengths the lining process was pretty much the same for each installation. Prior to the start of the works all the downpipes were surveyed and measured so that as each to be lined there was no need to take measurements on the day.
been highlighted in the survey. The selected resin also cures quickly when heat is applied with steam and/or hot water thereby minimising the timeframe for each lining operation.
The proposed lining technique was presented to Mark Norton, the main contractor and the client and approval was received to commence the works. Once this approval had been given, S&D Services ordered the materials from CJ Kelly and the delivery was on site within 24 hours. Steve Sampson commented: “As always when we find ourselves working with John and his team we received an excellent and speedy service and they are always available with back-up should we need it.”
LINING WORKS
The Marlborough College site had very limited access and this meant that everything that was required to complete the lining works had to be extremely portable. Most of the work was undertaken from a
To line each downpipe first a 90o bend was added to the bottom of the pipe. The bend was then blocked to prevent the liner from expanding outside of the confines of the pipe being lined. This allowed the resin impregnated liner that had been previously prepared to be inverted into the pipe with compressed air up to the stop in the bend. The liner was kept constantly under pressure with air and forced back to form, shape and, with the resin side out, to adhere to the contours of the downpipes. This was then heated with a small volume of very hot water which was sufficient to cure the material. The fast cure resin meant that each cure took no more than 2 hours. Once curing was completed the bend at the base of the down pipe was removed and the liner was cut back to fit flush with the downpipe end.
Whilst the curing process was being completed on one liner, the liner material for the next installation was being prepared and this was impregnated just ahead of its installation once the lining installation equipment had been moved from the last position.
Steve Sampson said of the project: “Mark Norton of Gray, Baynes & Shew, who ultimately acted as project manager for this scheme, was instrumental in making this task work by undertaking the preliminary enquiries with both John Kelly and ourselves and then liaising with Stepnell.”
Stephen Wadham, who ran the project for S&D Service on site, said: “The Stepnell team was easy to work with. Before starting work, we liaised closely with them to ensure that Stepnell’s exacting safety standards and site rules were complied with in every respect. By keeping our clients informed in advance of where we wanted to work and of any problems we were encountering they were able to arrange access and make preparations for us in advance ensuring there were no hold ups. This was crucial to enabling us to finish on time and in budget.”
John Kelly of CJ Kelly Associates said: “This was an excellent situation for our Brawoliner 3D system as it met all the demands of the site and provided a solution that saved time, money and the need to fully replace the rainwater drainage system at Marlborough College. This is precisely the sort of situation this liner was designed to meet. It was also a pleasure to work with a set of contracting teams that could work closely together so well to achieve the required solution.”
CCTV survey of one of the lined downpipes after the lining process showing the smooth finish despite the various irregularities in the original pipe work.
follow us on twitter @draintrader | February 2016 | drain TRADER 25
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80
