Convergence bolts and equipment

In tunnels, prisms for monitoring deformations are assembled predominantly on convergence adapters. They can either be directly mounted to the reinforcement of the tunnel lining or even fitted subsequently by drilling and gluing.

Alternatively you have the choice between the standard version 5KB with 3/8 inch male thread or the model 5KBW with fixed 12mm LEICA-adapter.

We recommend the use of bolt 5KB including connection adapter 46-VA made of plastic, which has an integrated predetermined breaking point (sacrificial join).

This combination is particularly reliable because even strong mechanical forces are unable to damage the convergence adapter, which is embedded in concrete. If heavy equipment touches the holder or a blasting backfires, the connection adapter would normally break but the bolt and the holder would remain intact.  

On construction sites with blasting activities both bolt types could be mounted with protection rings made of steel. In combination with the optionally supplied blind plug, the bolts can be additionally protected against shotcrete!
 
Convergence-bolt with 12 mm Leica-adapter

Convergence-bolt with 12 mm Leica-adapter

Made of galvanized steel with solid concrete angedrehtem 12 mm LEICA plug.

Convergence-bolt with 3/8"-male thread

Convergence-bolt with 3/8"-male thread

The standard bolt galvanized rebar. Our prisms can basically fix only with a connection adapter 46-VA with breaking point on this pin.

Accesoires for Convergence bolt with 3/8" male thread

Accesoires for Convergence bolt with 3/8" male thread

Accesoires for Convergence bolt with 3/8" male thread

Protection ring against damage to convergence-bolt

Protection ring against damage to convergence-bolt

On construction sites with blasting, our convergence measurement pins are fitted with a protective ring of welded steel. The inclusion of the prism is then absorbed in the ring and is protected effectively from rocks.

Welding-/Magnet adapter with Leica-adapter

Welding-/Magnet adapter with Leica-adapter

With these adapters you can attach each prism with 12 mm LEICA jack on a steel structure.

Beam clamp with  M8-female thread

Beam clamp with M8-female thread

Made of galvanized steel, mouth width 0-23 mm. With this clip, you can attach your prisms on lattice towers, T-beams, sheet piles, etc

Wall bolt with M8-female thread

Wall bolt with M8-female thread

Our wall bolts from the 11R series offer a particularly economical way to install prisms in concrete, rocks or walls when used with the respective adapters.

Adapter M8-LEICA adapter for wall bolt

Adapter M8-LEICA adapter for wall bolt

The "direct" connection between our wall bolts 11R series and all the (tunnel)-prisms with LEICA recording.

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