TECHNICAL | BTS MEETING/NORTH BRISTOL RELIEF SEWER
B) Tender boreholes only 60
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Right, figure 9: Maxwell Model - Tender boreholes only
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One of the key temporary works undertaken on
the project was to support the existing Frome Valley Sewer, so that it could be undermined to create the new MH12 connection point and still remain live. This was achieved by using a bespoke solution consisting of flat slings, universal beams, and tie bars, as shown in the right-hand side picture in Figure 12. Once the chambers had been constructed the final connection into the existing sewer was made, this was then closely followed by placing the cover slabs to isolate the sewer. This sequence and method of construction minimised the risk as far as practicable of working in a confined space live sewer environment. Figure 12 below shows a series of the bespoke temporary works and lifting arrangements that were required for these two manholes.
MH10 and MH09 The two deep shafts on the project were constructed using traditional underpinning techniques to full depth. During the construction of MH09 shaft sinking was paused to install a portal frame that would later allow the recption of a 1.2m i.d. pipe jacking machine.
Shaft sinking was also paused in MH10 to complete a 116m-long 0.45m i.d. auger bore drive that would eventually connect to another section of the existing sewer network. Figure 13 shows the shafts during various stages of construction.
SOCIAL AND COMMUNITY ENGAGEMENT Throughout the project, the Murphy team developed and maintained strong, efficient, and collaborative relationships with the client, 3rd party stakeholders, supply chain and end users. It was anticipated early in the conception of this project that a key element for success was going to be community engagement so Murphy employed a dedicated stakeholder manager who helped the client to identify and manage key stakeholders, such as Ambition LW, The Lawrence Weston Community Farm, and various schools within the area. In recognition of the approach to community engagement, the project was awarded an Excellent Rating for the Considerate Constructors Scheme. The project also:
● Considered key sensitivities during the design of the project such as the use of electric plant where
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Right, figure 10: Maxwell Model -
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24 | November 2023
Elevation from SL (m)
Elevation from SL (m)
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