Obayashi Technology Exhibitionin 17WCEE

Experimental
Technologies

Tri-Axial Shaking Table

Payload capacity 50 ton
Table dimensions 5m × 5m
Rated spec X-axis Y-axis Z-axis
Max. stroke(cm) ±60 ±30 ±20
Max. velocity(cm/s) 200 130 100
Max. acceleration(G) 3 2 2
Frequency range(Hz) DC 〜 50

The tri-axial shaking table boasts a large capacity payload, acceleration, velocity, stroke, and table dimension, enabling a wide range of vibration with high fidelity.
The table can simulate vibration equivalent to twice that of the 1995 Kobe Earthquake.
We use this to achieve advanced technical developments,
e.g., development of base isolation systems.

Developed Technology

Fail-Safe Ceiling

Our Fail-Safe Ceiling prevents the existing ceiling from falling during earthquake events.

Features
  • Higher safety with a flat bar and net catch
  • Inconspicuous but ensures safety
  • Can be used for curved ceilings
Video
A full-scale shaking test model

Large-Scale
Centrifugal Experiment

Platform radius 7.0 m
Maximum centrifugal
acceleration		 120 G
Maximum payload capacity 7000 kN・G
Area of loading platform 2.2 m×2.2 m
Maximum shaking
acceleration		 50 G
Maximum driving force of
shaker		 1200 kN

We can reproduce the behavior of the entire section of ground containing large structures or underground structures by applying centrifugal force to a scaled model of the ground.
This device makes it possible to evaluate the dynamic interaction between the ground and the structure during earthquakes, or to investigate dynamic phenomena such as liquefaction.

Developed Technology

Inclined-Braceless Excavation Support

With this system, bracing such as wailings, struts or tiebacks, is no longer required to retain the walls of an excavation.

Features
  • Construction period and cost are reduced
  • Improved workability of internal excavation and structure
  • Shoring can be eliminated
Video
A 50G load test model

Large Shaking Table

Dimensions 35m × 6.5m
Frequency range DC-20Hz
Loading capacity 50 ton
Maximum speed 24 cm/s

This shaking table allows us to reproduce and experiment with the dynamic behavior of the ground, for example liquefaction caused by earthquakes.
This enables us to more realistically verify the safety level of the earthquake-proofing of structures and piles.

Developed Technology

Deterrent Piles for Lateral Spreading

The deterrent piles reduce horizontal movement of liquified ground.

Features
  • Reduce damages due to liquefaction
  • Cost savings against liquefaction
Video
A shaking test model of Deterrent Piles

Bi-Axial Force
Testing Equipment

Vertical loading capacity ±8,000kN
Horizontal loading capacity ±2,500kN
Maximum size of specimen
Height 4.5m
Length 5m
Thickness 1m

Using this test equipment, we can perform an efficient bi-axial loading test that will give highly accurate results.
This equipment can apply vertical loads (actuator 1 and 2) and horizontal loads (actuator 3) efficiently and with high accuracy and efficiently.

Developed Technology

LRV Construction Method

Full precast reinforced concrete beams and columns make possible faster high-quality construction of high-rise buildings.

Features
  • Improves quality and workability
  • Construction period can be shortened significantly
  • Weight can be reduced
Video