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Universal Threader

Sheet Pile Threaders

Dawson Universal Sheet Pile Threader
Sheet pile threaders ("spunssamlere") are designed for safe and rapid sheet pile interlocking when sheet piles are being pitched in panels. They replaces the "Top man" or "Pile Monkey" who normally carries out the interlocking by hand. It greatly reduces the risk by interlocking piles in severe weather conditions. It saves time, money and lives.

Contrary to the Standard Sheet Pile Threader - please refer to the separate web page - the Universal Sheet Pile Threader can be used for most sheet piles without any special roller sets.

Sheet piles may vary in several ways. The interlocks of Z-piles are usually different at each end. The leading can also be left or right hand. Besides, the sheet piles are not always as expected. They may be outside of manufacturing tolerance.

The Universal Sheet Pile Threader can accomodate these variations with the single adjustment of roller positions. This can be accommplished on site by offering the Sheet Pile Threader up to a pile and adjusting the rollers to the correct positions. They are now set for a left or right hand threading.

Safe working method. The sheet pile threader eliminates the dangerous, manual operation performed by a Top Man climbing or being hoisted up to the top of the piles and interlocking the piles.
Fast. Interlocking piles with the pile threader is faster than any other safe method of working.
Pitching under severe weather conditions. The sheet pile threader makes it possible to make piling work under severe weather conditions as interlocking can take place even under high wind pressure on the sheet piles.

Main Parts
The Universal Sheet Pile Threader consists of two parts:

  • the lower section and
  • the upper section.

The lower section have a fixed arm with rollers and a swing arm, likewise with rollers. When placed around the last pile in the panel (the part of the wall already installed) the section can be clamped around the pile by tightening a swing arm clamp bolt. The lower section contains a socket in which a spigot in the upper section fits.
The upper section contains a sliding and spring loaded vice block for mounting the pile to be interlocked with the last pile in the panel. The vice block can be cocked into a loaded position. The upper section contain a spigot that fits into the socket in the lower part.

Lower section of threader.

After the Sheet Pile Threader has been offered up to a sheet pile and the roller positions adjusted to suit, the threading operation can begin.

  • The lower section of the threader is taken to the last pile in the panel (the pile already istalled).
  • The arms of the lower section are put into position and locked via the swing arm clamp bolt.
  • The spigot of the upper section is then lowered into the socket of the lower section.
  • The vice block of the upper section is cocked (loaded).
  • The sheet pile to be installed is clamped into the vice block.
  • The crane lifts the pile to be threaded until its bottom edge is just above the previous pile in the panel. The spring pressure on the vice block forces the pile across to its engagement position. As the pile is lowered, it interlocks.
  • The threader is released at top frame level ready for next pile.

Note: When threading single piles, the next pile will be an opposite hand. To accomodate this, the lower section can be rotated through 180 degrees on the previous threaded pile and the upper section attached as usual.

The Universal Sheet Pile Threader is delivered in a practical aluminium box.

See how it functions:

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