refurbishment in the field of: hydraulic steel structure, ...

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Refurbishment of a hook type gate at Lavamünd Power Plant

General: Year of construction 1943
Riveted construction
Width 24 m
Height (of damming) 11 m
Weight of Upper Gate: appr. 80 mtons
Weight of Lower Gate: appr. 140 mtons
Design: Designed (as usual up to the middle of the 20th century) as riveted body.
Welding was used for seal welds only. The repair-concept had to consider these facts.
Damage: The gate was heavily damaged by a defect of the drive system: the upper gate was lifted unbalanced to an inclination of appr. 2,5 m. The gate has got jammed in the guides, for removal of the gate some components as drive chains, chain-columns and overflow guide plates had to be cut off.
 
Repair: The destroyed riveted parts were replaced by new designed welded parts. The welded parts were connected to the riveted gate by close-tolerance bolts. Undamaged parts were reused whenever possible.
 
Order: Redesign and dimensioning of new welded parts..
 
total view upstream Upper Gate: total view from upstream.
On top right: the cut-off part of the chain column
Upper Gate: total view from downstream.
Visible the warped wheel cases.

total view downstream
 
Repair of Upper gate:
  • replacement of frame runner wheel cases
  • replacement of dead end frame, end frame and overflow guide plates
  • replacement of chain columns 
  • replacement of the skinpate (partly) and various small components

Frame runner wheel cases from downstream. The wheel cases were heavily warped and replaced by welded components, fitted by close-tolerance bolts to the structure.

The left chain column was cut-off during removal of the gate. Both chain columns were replaced by new columns in welded design.

upper gate

Dead end frame and end frame were also damaged and had to be replaced. The new welded design was fitted in site and bolted to the existing structure.

Clipping from an original drawing.

 
Repair of Lower gate:
  • repair of the roller rails for the runner wheels
lower gate Lower gate: total view from downstream.
 
Reconstruction of seal system:
  • design of a complete new seal-system; all seals bolted to the lower gate.

 

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Last update 27/04/03