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Wallbridge Lower Lock Update No. 5

Wallbridge Lower Lock

Realignment works to the canal bed in compliance with Environment Agency requirements are now complete. Surfacing of the tow path, in stone, from Brewery Bridge to the position of the landing steps at the downstream end of the lock is 95% complete.

Buttresses hold up walls and work

Generally progress on the bypass has been as anticipated in the original programme. However, excavations have been somewhat slowed by the need to breach a number of large brick buttresses created by the 1780's bricklayers to support the lock walls.

No plans or drawings exist from those long ago days. This means that today’s engineers discover and dismantle each buttress anew as they progress with the excavations.

The original walls will be tied in to the new concrete structure. Floodlighting has been installed in order to maintain the hours.

Impressive structure

The lock by-wash and fish pass is an impressive 75 metres long concrete culvert. The walls forming that culvert are complete from the upstream inlet to the first resting pool. The term resting pool means exactly that. This is an area where migrating fish and eels will rest to gain strength to negotiate the Larinier Fish Pass referred to in update No. 4.

Non slip walk-way

The culvert will, in part, be covered by a Fibregrate grating to form a non-slip walkway beside the channel. (See first picture)

The remainder of the culvert is in the form of a concrete tunnel. Mike Gallagher ventured down inside the four foot high space to get photograph number two. The inlets can be seen to the top right of the picture.

Formwork installation

The third photo shows the continuing installation of formwork at the western end of the structure.

Click on the images to view larger versions

Click here to view Mike Gallagher's
Wallbridge Lower Lock Album

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