Steve Vick News
Steve Vick tackle a major Grout Project04 Jan 2010
The Steve Vick International Contracting department was recently called in to fill the annulus around a newly inserted gas main that had been diverted away from a redundant gas yard in Peckham, where a new recycling centre is set to be built.
Grouting Project
The old 48” cast iron inlet main ran through the middle of the gas yard, connecting to the holder station. However, before anything could be built on the redundant land the gas supply needed to be diverted towards the outskirts of the gas yard, avoiding the vicinity where the new recycling centre would be built. On behalf of Morrison Utility, Forefont Utilities and Ward Construction carried out the work.
A new 630mm PE pipe was laid in a corner of the gas yard avoiding the area which will be built on. The 630mm pipe was then connected into the existing network by inserting the PE into the old 48” main leading to a residential street.
Where the 630mm pipe had been inserted into the 48” main, a 25metre section required the annulus to be filled with 6 tonnes of grout to prevent the possibility of landfill sinking below ground level if the cast iron were to break. It is believed that this particular section is set to be the main entrance to the recycling centre making it critical for the pipe to uphold heavy, continuous loads.
Steve Vick International Special Contracting Technique
An ENDSEALTM was fitted at either end of the 25 metre section to create a dam for the cementious, fast curing grout to be injected.
This system is a low cost solution when faced with the need to seal off large diameter inserted or abandoned gas mains. The technique is based upon the well proven expanding foam technology which has been used in the UK gas industry for over 20 years.
Once the ENDSEALSTM were fitted either side of the 25 metre section of main, an injection tube and venting point were installed ready for the grout to be pumped.
At this stage the Steve Vick International Special Contracting team were able to start preparing the grout using a specialised mixing rig. The dedicated machine mixed the grout with water and pumped the liquefied grout through the injection point.
It took a total of four hours to pump six tonnes of grout, which filled the entire annulus between the two ENDSEALSTM. Once the grout was seen to settle in the two points of entry; injection and venting tubes, it confirmed that the annulus was filled and the job was complete.
Martin Ward of Ward Construction commented on the job “Steve Vick carried out this operation effectively and quickly. The team were professional at all times and I would not hesitate to call Steve Vick again in the future”
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