Framework for the provision of a Tunnelling, Drilling & Shaft Works for Build Only and Design & Build

The Lots ending "B" require the contractor to deliver the works as Principal Contractor only. Interested parties will have the opportunity to select the specific Lots they want to undertake when invited to tender following expression of interest in this opportunity. TUNNELLING & DRILLING WORKS Lot 1B - PIPE RAMMING Pipe ramming is a trenchless method for horizontally installing steel pipes or casings under obstacles like roads, railways, and rivers by using a pneumatic hammer to drive an open-ended pipe into the ground, displacing soil outwards. This technique is typically used to cross under embankments, road, rail and river links. Lot 2B - THRUST BORING Thrust boring is a trenchless method for installing pipes and conduits (like for utilities) underground without open digging, using a rotating auger inside a steel casing to excavate soil while hydraulic jacks push the casing forward, ideal for going under roads, railways, or buildings. It's a cost-effective, dependable technique for short to medium distances, creating a bore for the final pipe or cable installation, and minimizing surface disruption. Pipe Diameter mm (host pipe internal diameter) = 25 -1000 Lot 3B - HORIZONTAL DIRECTIONAL DRILLING (25-630) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 25-630 Lot 4B - HORIZONTAL DIRECTIONAL DRILLING (630-1200) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 630-1200 Lot 5B - HORIZONTAL DIRECTIONAL DRILLING ROCK DRILLING (50-500) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 50-500 Lot 6B - TIMBER HEADING A timber heading is a traditional, hand-dug tunnelling method using timber supports (sets, headboards, sideboards) to create a safe, short tunnel for installing pipes or cables, especially under busy roads or structures, avoiding major disruption by building around existing underground services. Headings are generally temporary structures where it is not required or economic to provide a more substantial structure. Pipe Diameter mm (host pipe internal diameter) = 1000-1500 Lot 7B - MICRO TUNNELLING Micro Tunnelling is a trenchless construction method for installing non man-entry size pipelines that uses a remotely operated, small-diameter tunnel boring machine (MTBM) to excavate underground while simultaneously jacking pipes into place, allowing for precise installation of utility tunnels (like sewers, cables, and conduits) without disturbing the surface above. It's ideal for crossings under railways, roads, and rivers, as it minimizes disruption. Pipe Diameter mm (host pipe internal diameter) = 250-1200 Lot 8B - AUGER BORING Auger Boring is a trenchless construction method that installs pipes or conduits underground by using a rotating helical screw (auger) inside a steel casing to excavate soil, pushing the casing forward and pulling spoil back to a launch pit. It's used to create stable, horizontal tunnels under obstacles like roads, railways, or rivers, minimizing surface disruption and traffic interruption, often called "dry boring" because it doesn't use liquid slurry. Pipe Diameter mm (host pipe internal diameter) = 50-1500 Lot 9B - DIRECT PIPE Direct Pipe is a trenchless technology that combines micro tunnelling and horizontal directional drilling (HDD) to install pipelines in a single step. It allows for the direct installation of pre-fabricated pipelines without the need for separate pilot hole drilling or pipe stringing, as is common in HDD. Pipe Diameter mm (host pipe internal diameter) = 90-710 Lot 10B - PIPE JACKING Pipe Jacking is a technique for installing man-entry size pipelines using a steerable tunnelling shield (similar to micro tunnelling, which is for non man-entry sized pipes). Typically the pipes are jacked from a drive shaft or pit behind a suitable shield. The pipes are installed using hydraulically powered rams which push off a jacking wall constructed within the drive shaft. Pipe Diameter mm (host pipe internal diameter) = 1200-3000 Lot 11B - SEGMENTAL TUNNELLING Segmental Tunnelling is the technique of forming an underground excavation using individual segments or rings by hand or mechanical means and providing a suitable supporting structure such that the excavation forms a permanent, stable and secure opening for the tunnel. Pipe Diameter mm (host pipe internal diameter) = 1500-14000 SHAFT WORKS For Lots 12B to 17B Interested parties are to note Bidders cannot bid for a Shaft Lot in isolation, Bidders must have capability to undertake associated tunnelling and or drilling works. See Tunnelling & Drilling Lots 1B to 11B. - All Shafts are concrete - Shaft Diameter Range (nominal internal diameter ms) = 2.44 to 25. - Shaft Depth Range (ms) = 5 to 25. Lot 12B - UNDER PINNING (FREE AIR) Lot 13B - UNDER PINNING COMPRESSED AIR) Lot 14B - OPEN CAISSON WET Lot 15B - OPEN CAISSON DRY Lot 16B - SHEET PILED PITS Lot 17B - TIMBER SHAFTS

Design & Build - Tunnelling, Drilling & Shaft Works The Lots ending "DB" require the contractor to deliver the works as Principal Designer and Principal Contractor. Interested parties will have the opportunity to select the specific Lots they want to undertake when invited to tender following expression of interest in this opportunity. TUNNELLING & DRILLING WORKS Lot 1DB - PIPE RAMMING Pipe ramming is a trenchless method for horizontally installing steel pipes or casings under obstacles like roads, railways, and rivers by using a pneumatic hammer to drive an open-ended pipe into the ground, displacing soil outwards. This technique is typically used to cross under embankments, road, rail and river links. Lot 2DB - THRUST BORING Thrust boring is a trenchless method for installing pipes and conduits (like for utilities) underground without open digging, using a rotating auger inside a steel casing to excavate soil while hydraulic jacks push the casing forward, ideal for going under roads, railways, or buildings. It's a cost-effective, dependable technique for short to medium distances, creating a bore for the final pipe or cable installation, and minimizing surface disruption. Pipe Diameter mm (host pipe internal diameter) = 25 -1000 Lot 3DB - HORIZONTAL DIRECTIONAL DRILLING (25-630) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 25-630 Lot 4DB - HORIZONTAL DIRECTIONAL DRILLING (630-1200) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 630-1200 Lot 5DB - HORIZONTAL DIRECTIONAL DRILLING ROCK DRILLING (50-500) Horizontal Directional Drilling (HDD) is a trenchless method for installing underground pipelines, cables, or conduits by drilling a precise, curved path from a surface rig, avoiding open trenches to minimize disruption to roads, rivers, and sensitive environments. The process involves drilling a small pilot hole, enlarging it with a reamer, and then pulling the product pipe or cable through the enlarged bore. Pipe Diameter mm (host pipe internal diameter) = 50-500 Lot 6DB - TIMBER HEADING A timber heading is a traditional, hand-dug tunnelling method using timber supports (sets, headboards, sideboards) to create a safe, short tunnel for installing pipes or cables, especially under busy roads or structures, avoiding major disruption by building around existing underground services. Headings are generally temporary structures where it is not required or economic to provide a more substantial structure. Pipe Diameter mm (host pipe internal diameter) = 1000-1500 Lot 7DB - MICRO TUNNELLING Micro Tunnelling is a trenchless construction method for installing non man-entry size pipelines that uses a remotely operated, small-diameter tunnel boring machine (MTBM) to excavate underground while simultaneously jacking pipes into place, allowing for precise installation of utility tunnels (like sewers, cables, and conduits) without disturbing the surface above. It's ideal for crossings under railways, roads, and rivers, as it minimizes disruption. Pipe Diameter mm (host pipe internal diameter) = 250-1200 Lot 8DB - AUGER BORING Auger Boring is a trenchless construction method that installs pipes or conduits underground by using a rotating helical screw (auger) inside a steel casing to excavate soil, pushing the casing forward and pulling spoil back to a launch pit. It's used to create stable, horizontal tunnels under obstacles like roads, railways, or rivers, minimizing surface disruption and traffic interruption, often called "dry boring" because it doesn't use liquid slurry. Pipe Diameter mm (host pipe internal diameter) = 50-1500 Lot 9DB - DIRECT PIPE Direct Pipe is a trenchless technology that combines micro tunnelling and horizontal directional drilling (HDD) to install pipelines in a single step. It allows for the direct installation of pre-fabricated pipelines without the need for separate pilot hole drilling or pipe stringing, as is common in HDD. Pipe Diameter mm (host pipe internal diameter) = 90-710 Lot 10DB - PIPE JACKING Pipe Jacking is a technique for installing man-entry size pipelines using a steerable tunnelling shield (similar to micro tunnelling, which is for non man-entry sized pipes). Typically the pipes are jacked from a drive shaft or pit behind a suitable shield. The pipes are installed using hydraulically powered rams which push off a jacking wall constructed within the drive shaft. Pipe Diameter mm (host pipe internal diameter) = 1200-3000 Lot 11DB - SEGMENTAL TUNNELLING Segmental Tunnelling is the technique of forming an underground excavation using individual segments or rings by hand or mechanical means and providing a suitable supporting structure such that the excavation forms a permanent, stable and secure opening for the tunnel. Pipe Diameter mm (host pipe internal diameter) = 1500-14000 SHAFT WORKS For Lots 12DB to 17DB Interested parties are to note Bidders cannot bid for a Shaft Lot in isolation, Bidders must have capability to undertake associated tunnelling and or drilling works. See Tunnelling & Drilling Lots 1DB to 11DB. - All Shafts are concrete - Shaft Diameter Range (nominal internal diameter ms) = 2.44 to 25. - Shaft Depth Range (ms) = 5 to 25. Lot 12DB - UNDER PINNING (FREE AIR) Lot 13DB - UNDER PINNING COMPRESSED AIR) Lot 14DB - OPEN CAISSON WET Lot 15DB - OPEN CAISSON DRY Lot 16DB - SHEET PILED PITS Lot 17DB - TIMBER SHAFTS