Spring Package VT4660-B

The advantages of pre-compressed isolators are:

The springs are pre-compressed to a deflection that equals a certain percentage (normally 80%) of the mass of the final building. During construction the isolator will be “released” once the pre-compression load has been applied, it will thus onlydeflect when the final 20% of the load is applied.

• Isolators can also be installed after construction or replaced by the use of hydraulic jacks. To achieve this all isolators must be accessible.
• By the use of nested springs the isolators can be fine tuned to a specific stiffness.
• The springs are design to withstand blocking (complete coil contact) without exceeding stress limits and causing plastic deformation.
• To minimize the effect of coil resonance in the springs the contact surfaces in the steel box are covered with an elastomer layer.

Spring material: 51CrV4 manufactured according to DIN 2096.

Finishing: shot peening + black powder coating alternatively Delta Magni Seal

Welded steel structure: mild steel S355 painted with primer and top coat.
Workmanship and tolerances in accordance with ISO 2768-1 Class M.

Pre-Compressed Spring Boxes primarily used for vibration isolation:

• Heavy machine foundation
• Buildings