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Formwork for jobs a standard system cannot do. The Allwell deep foundation lines a shaft 6 to 11 m across with bolted steel liner plates, so a foundation can be dug safely beside a live railway. We also make moulds for seismic stoppers, fixed and movable.
Liner plates are roll-formed, punched and curved to the diameter you need, from 6 to 11 m. Rings are added as the shaft goes down. The model shows an 8 m shaft, 6 rings deep, cut away on one side.
Scroll: the camera moves to each part in turn and ends on the exploded view. Drag to turn it round yourself.
01 / 08
The ground is dug a ring at a time. Each ring of steel liner plates is bolted under the last, and grout is pumped behind it. The shaft wall is never left unsupported.
Scroll to see how it is built · drag to turn it round
02 / 08
Sheet from coil is roll-formed into a corrugated section, punched, curved to the shaft diameter and cut to length. The corrugation gives a thin plate the stiffness to hold back the ground.
Used here for: Corrugated liner plates
Used here for: Corrugated liner plates
03 / 08
An end plate is welded by robot to each side of a liner plate, and a curved beam runs top and bottom. Every plate then bolts to its neighbours and to the rings above and below.
Used here for: End plates, curved beams and bolts
04 / 08
A ring beam on outriggers sits at ground level. It sets the shaft true before the first ring goes in, and it carries the ladder, the roof and the jig.
Used here for: Top guide frame
Heavy profiles that need precise holes, where plasma cannot do the job: the lower structure and panel borders of a ground flare, and every bolted PEB and multi-storey frame.
05 / 08
Grout between the liner and the ground fills every gap and locks the liner to the soil. This is what protects a railway foundation next to the shaft from movement and vibration.
06 / 08
A caged ladder takes workers down the liner. A roof over the shaft keeps rain out and folds back when a load has to be lifted in.
07 / 08
A jig on the guide frame holds the reinforcement cage central while it is lowered into the shaft.
08 / 08
Liner plates, end plates, curved beams, guide frame, ladder, roof and jig.
We fabricate to your drawings and prove the fit in our own bay before anything ships. Open any line for the detail.
Talk to an engineer
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We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.