Plant, equipment and documentation (03 46041 – 03 46073)

dam shield

diaphragm across the rear of a tunnel shield (03 46032) or one of its compartments used in conjunction with a front shield diaphragm (03 46040) to control ingress of unstable ground (01)

cylindrical rear portion of a tunnel shield (03 46032) or tunnel boring machine (03 46029) in which the tunnel segments (03 42011) are erected

steel plate (01) that protrudes from the external surface of a tunnel shield (03 46032) and is used to correct or prevent shield roll (03 44004)

one of a group of hydraulic cylinders mounted within a tunnel shield (03 46032) supporting the tunnel face (03 42019)

tunnel boring machine (03 46029) with peripheral drive motors and no centre spindle

equipment on the ground (01) surface for removing solids from a slurry (01)

equipment for treating and eliminating sand (BS EN 12670) from a slurry (01)

grout (01) mixer that uses compressed air (BS EN 12110) to drive a paddle and pump the mixture through a pipe (01)

tunnel boring machine (03 46029) without a tunnel shield (03 46032) for support

tunnel shield (03 46032) that supports the tunnel face (03 42019) while advancing

shield machine (BS EN 12336) in which the forward part, including the cutter head (03 46070), is separated from the rear by a bulkhead and air pressure is applied to this part in order to support the tunnel face (03 42019)

tunnel boring machine (03 46029) that enlarges a pilot tunnel (03 41002) in one or more steps

fitting on the end of a hydraulic cylinder on a tunnel shield (03 46032) to spread the load (01) from one structural member (01) on the tunnel ring (03 42014) or similar support against which the hydraulic cylinders are pushed to advance the tunnel shield (03 46032)

self propelled machine that cuts coal (BS 3323) or soft materials by means of a transversely rotating drum

swing arm on a boring machine or tunnel shield (03 46032) for picking up supports and setting them down in position

tunnel shield (03 46032) of circular or D shape, whose outer skin is formed of a series of blades that are advanced by rams while the ground (01) is excavated by cutter boom (12 26039)

tunnel shield (03 46032) modified for use in subaqueous tunnels (01) in which access to the tunnel face (03 42019) is limited to a number of openings that can be closed to prevent inrushes of mud or water

shield machine (BS EN 12336) in which only part of the tunnel face (03 42019) is mechanically excavated at a time and the cutter head (03 46070) moves across the tunnel face (03 42019)

flexible device fitted to the tail skin (03 46042) of a tunnel shield (03 46032), forming a seal between it and the assembled tunnel (01) preventing material from the tunnel face (03 42019) outside the tunnel shield (03 46032) or behind the tunnel lining (03 42005) entering the tunnel (01)

device for removing water from a compressed air (BS EN 12110) tunnel (01) by means of a pipe (01) to free air and a valve (01) controlled input; water is driven out by differential air pressure

device for securing the position of a tunnel boring machine (03 46029) in soft ground (01) using hydraulic cylinders to exert pressure on to the walls of the tunnel (01)

horizontal longitudinal strut (01) mounted within a tunnel shield (03 46032) and restrained so as to provide support to face boards (03 46008) whilst the tunnel shield (03 46032) is being moved forward

one of a set of hydraulic jacks (12 56028) installed in a jacking shield (03 46036), controlling the direction of the tunnel (01) drive

strong, steel ring bearing against the end of a tunnel lining (03 42005) through which the force (01) from hydraulic jacks (12 56028) is transmitted in microtunnelling (01), or in advancing a tunneling machine or tunnel shield (03 46032)

length of pipe (01) modified to facilitate first length of pipe (01) in pipe jacking (01) that has been modified to facilitate connection to the tail of a jacking shield (03 46036)

mobile staging (01) for rock drills (12 26040) in tunnel (01) excavation (01)

heavy percussive rock drill (12 26040) for mounting on a screw or chain feed with reversible rotation and air or water flushing

powered front-loading self-propelled shovel that discharges overhead to its rear

pneumatically powered rotary percussive rock drill (12 26040) axially mounted on a pneumatic cylinder for excavation (01) of stopes (03 41008)

front end of an excavator (12 26006) with a cutter for rock (03 23027) or soft ground (01)

device rolled across the face of rock (03 23027) with the concentration of pressure or stress (01) spalling (01) the rock (03 23027)

rock cutter (03 46071) in the form of a truncated cone that rotates around its axis; the side, reinforced by tungsten carbide bits (12 16006), bears against the face of the rock (03 23027)

rock cutter (03 46071) in the form of a disc whose tapered periphery bears upon the face of rock (03 23027) and that rotates about a central axis