Crossing of the M1 Freeway at Wyong, NSW
Original bore was designed to included a 750mm casing pipe to house a 450mm water main which would then require a borehole of approx. 950mm. This design had the pipeline above the rock shelve and within close proximatey to the road surface (2-3m) placing a high risk of Frac-out and or bore hole collapse during its construction.
After a detailed review of the project including geotechnical and existing services, Trenchless Advisors re-design the bore placing it approx. 8m below the surface of the road and within the sandstone ground conditions. As the bore was now within the rock, a casing was not required (after the confirmation of a settlement analysis) so the casing was eliminated requiring a smaller bore hole of approx. 550-600mm. A safe boring clearnace was placed around the existing petrol and gas pipelines as well as a suitable and achievable bend radius.
Service: Feasibility and concept design
Product: 1 × DN450 PE100 PN16 (SDR11)
Bore Length: 450m
Environmental Factors: Major multi lane road crossing and major gas pipeine crossing
Ground Conditions: Road surface, clays & sandstone.