Monday, September 26, 2022

Movements At Allen Watson

The Allen Watson Limited (AWL) website has been reconstructed giving information for trenchless pipe installation techniques

The Allen Watson Limited (AWL) website has been reconstructed giving information for trenchless pipe installation techniques. At the new site visitors can read case studies of projects and see animations of trenchless pipe installation techniques, career information and request for a quotation.

Further to this it was also recently announced that at the Annual UKSTT AGM held at Camden House, Kenilworth, UK, AWL’s project manager Simon Marsh was elected on to the UKSTT Council. His 30-year experience will be of assistance to an organisation which has been at the forefront of the UK Trenchless Industry.

AWL also continues to invest in new equipment, with the purchase of wash-over augers and ancillary equipment. This investment will allow a guided auger bore without the need for a reception shaft including an existing in-service manhole.

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The GAB (Guided Auger Boring) machine will pilot from the drive shaft to a point at the line and level required, then the wash-over augers and cutting head which are inside a sacrificial steel sleeve, as the augers rotate will slide along the pilot rods maintain the required line and level. When the drill is complete the augers and pilot rods are retracted back in to the drive shaft.

Advantages of this technique include:

  • No reception shaft required
  • Reduction in the mechanical connections between each stage of the GAB
  • Removes an installation process thus reducing programme time

On a recent project for Flood Alleviation In Battersea, London, UK AWL carried out a Guided Auger Boring Project. Titled Grayshott Road Flooding Main Works Battersea the project was supporting Cappagh Contractors Construction (London) Limited which was carrying
out the civils package which included the shaft sinking, manhole construction, pumping station and rising main installation.

The project was a flood alleviation scheme to reduce the risk of flooding to properties located in the Grayshott and Ashbury Roads areas. A design was produced which would provide relief sewers to intercept the property connections of the affected properties to a new pumping station which was to be constructed in the carriageway in Ashbury Road near the junction with Grayshott Road.

In total the scope of works for the project required Cappagh Contractors Construction (London) Limited and Allen Watson to construct:

  • Construct a new pumping station of 2.5 m internal diameter at a depth of 4.5 m to sump level, complete with two wet well submersible pumps
  • Construct four manholes at depths between 2.3 m to 3.5 m
  • Install 107 m of DN225 Vitreous Clayware surface water sewer and a 7 m DN225 Vitreous Clayware sewer

Due to the sensitivity of the scheme, close collaboration between Thames Water and Cappagh/AWL with the residents was required to ensure a high-quality level of communications to the progress of the construction.

The works took place within a residential parking zone so all site transport had to be agreed with the London Borough of Wandsworth including the suspension of residents parking bays. Also, the construction works affected access to private property occupied by residents so a safe system of works was required.

https://allenwatson.com or to see the video of the Battersea site works: https://bit.ly/3ozkm4w

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