Page Top

Kajima's Advanced Structural Control and Base Isolation Technologies

Base Isolation System

Base Isolation Technology Significantly Increases Safety
against Earthquakes

The amplitude of seismic vibrations is reduced to one-half to one-fifth.

The whole building is isolated from the ground, so all the floors from the first to the top have the same superior level of safety and a good living environment. With earthquakes exerting tensile forces on buildings, buildings that have many stories or irregular shapes may not be suitable for base isolation.

However, the “Winker Method®” developed by Kajima is applicable to these types of buildings.

The “Winker Method®” not only improves reliability and safety, but increase the flexibility of building planning.

image:Conceptual diagram of base isolation

Conceptual diagram of base isolation


Our base isolation technology protects important assets by
preventing furniture and equipment in a building from falling down.

An earthquake causes damages not only to the building structure, but also to its contents, such as furnishings, appliances, utilities, and furnitures. The damage is estimated from an index called Probably Maximum Loss (PML). PML is based on a predefined earthquake in the applicable building code that occurs once every 50 years with a probability of 10 percent being exceeded. Base isolation technology can effectively reduce the shaking of a building, thus lowering the PML most significantly.

image:Normal building

Normal building

image:Base-Isolated building

Base-Isolated building


Kajima’s base isolation technology menus

Imparts base isolation to high-rise
and super high-rise buildings.

Isolates the whole area with buildings and houses.

image:Winker Method®

image:Artificial Base Isolation Ground

Cost is lower than that of the conventional
base isolation method.

Reduces minor shaking and cuts traffic vibrations.

Smart Isolation Foundation Method®

image:Earthquake Protection and Vibration Isolation.

Retrofit technology that is suitable to an existing building.

A building can be renovated using base isolation technologies while under normal occupancy.
This reduces the costs and inconvenience to the owner and building occupants.

  • The building can be occupied during retrofitting construction.
  • The existing building maintains its seismic resistance and safety as well as its functions.
  • It is possible to implement base isolation control with almost no access to the interior of the building.