A flight of locks was considered but discarded, mainly because of the lack of a suitable site and the loss of water that would have resulted from using them. The visitor centre incorporates the new lift control centre.
Attempts to repair the grooves with copper made matters worse as it reacted electrolytically with the acidic canal water and hastened corrosion of the surrounding iron.
In addition to the new foundations and superstructure, the wet dock at river level was also converted into a dry dock and the aqueduct between the lift and the canal was strengthened.
At that time the Anderton Basin consisted of a cut on the north bank of the Weaver surrounding a small central island. As Saner had promised, the lift was only closed 54808 anderton ch 1 three periods during these two years, for a total of 49 days.
They asked their Chief Engineer Colonel J. Completion of the River Weaver Navigation in provided a navigable route for transporting salt from Winsford, through Northwich, to Frodshamwhere the Weaver joins the River Mersey.
As the weight of the caissons and counterweights would now be borne by the lift superstructure instead of by the rams. The Anderton Boat Lift was formally opened to traffic on 26 July Modern Anderton Boat Lift visitor centre and exhibition building.
Although this solution involved many more moving parts than the hydraulic system these would be above ground and accessible thus making maintenance easier and cheaper and have a longer working life. He may have been inspired by inspecting a hydraulic ship lift and graving dock at the Royal Victoria Dock in London, designed by experienced hydraulic engineer Edwin Clark.
Canal boat entering the River Weaver from the base of the boat lift. The gland of one cylinder where the piston travelled through the cylinder wall was temporarily repaired in and replaced inand the gland of the other cylinder was replaced in Conversion was carried out between and However, maintenance was simpler than before the conversion because the mechanism of the electrical lift was above ground.
Over the next few years maintenance and repairs took place with increasing frequency, requiring complete closure of the lift for several weeks or a period of reduced and slower operation with a single caisson.
This was important because it minimised disruption to traffic and the loss of revenue during conversion. Economic background[ edit ] Aerial view of Anderton Boat Lift and basin on the north bank of the River Weaver Salt has been extracted from rock salt beds underneath the Cheshire Plain since Roman times.
Maintenance was also less expensive because the caissons were now designed to be run independently, allowing most maintenance to be carried out while one caisson remained operational and thus avoiding the need to close the lift entirely.
The superstructure was strengthened and put on stronger foundations. By the end of the 17th century a major salt mining industry had developed around the Cheshire "salt towns" of NorthwichMiddlewichNantwich and Winsford.
Saner promised to achieve the conversion with only three short periods of closure to traffic. Above ground the superstructure consisted of seven hollow cast iron columns which provided guide rails for the caissons and supported an upper working platform, walkways and access staircase.
Saner proposed electric motors and a system of counterweights and overhead pulleys that would allow the caissons to operate independently of each other. If necessary, the steam engine and accumulator could operate either hydraulic ram independently to raise the caissons, although in this mode it took about 30 minutes to raise a caisson, as opposed to three minutes in normal operation.
He settled on a design involving a pair of water-filled caissons that would counterbalance one another and require relatively little power to lift boats up and down. Leader Williams realised that if he used water-filled hydraulic rams to support the caissons their weight would be borne by the rams and their cylinders, buried underground and a much lighter superstructure could be used.
The new superstructure was built around the original lift frame in order to avoid the need to dismantle the original lift, which would have taken it out of service for a long period. The use of canal water as a working fluid in the hydraulic system and the immersion of the pistons in the wet dock at river level led to corrosion and "grooving" of the pistons.
At river level the caissons sat in a water-filled sandstone lined chamber. To make adjustments at the start and end of a lift either cylinder could be operated independently, powered by an accumulator or pressure vessel at the top of the lift structure, which was kept primed by a 10 horsepower 7.
The electric motor had to overcome friction between the pulleys and their bearings. During and the hydraulic rams of the original lift, which had been left in place in a shaft beneath the dry dock, were removed to salvage the iron. During these tests the second cylinder failed too. Note that caissons can be operated independently.
The main cause for concern was corrosion of the pistons. Work started before the end of and took 30 months. The opening of the Trent and Mersey Canal in provided a second route close to the Weaver Navigation for part of its length, but extended further south to the coal mining and pottery industries around Stoke-on-Trent.
The converted lift was formally opened on 29 July although one caisson had been carrying traffic on electrical power since May while the second caisson was converted. As a result the boat lift was closed for six months while sections of both cylinders were replaced and the connecting pipework, which was thought to have contributed to their failure, was redesigned.
Induring repainting, extensive corrosion was found in the superstructure and it was declared structurally unsound and closed.Feb 10, · PEST MODEL AND PORTER'S FIVE FORCES RESEARCH FOR THE STREAMING DIGITAL CONTENT INDUSTRY - Technology bibliographies - in.
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