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New Technology Daiken Ceiling grid Construction Method for Buildings and Stores

Utilizing the know-how of installation method of ceiling system,DAIKEN has achieved both earthquake resistance and workability improvement.

After the Great East Japan Earthquake, the Japanese Building Standard Law was revised to require higher seismic performance for ceilings. However, there was a concern that fulfilling the demand with the conventional construction method would result in an increase in the construction workload.

To address this issue, DAIKEN adopted a unique new ceiling construction method that can improve the seismic performance of ceilings in a short construction period with less workload.

This solution uses a ceiling underlayment material that combines the benefits of conventional ceilings with those of system ceilings.

Earthquake resistance and workability improvement with comfortable indoor environment maintained

Simplified Construction with Improved Safety

Improving Seismic Performance with Conventional Ceiling Method

• Joists need to be bound to joist retainers using clips and reinforcing metal fittings.
• High-rigidity diagonal bracing corresponding to the unit weight of the ceiling needs to be installed.

3 to 4 times the conventional construction workload is needed.

New Ceiling Construction Method

*Not applicable to some specific ceilings such as curved ceilings

• Dedicated T-bars have tenon joints, so need not be fixed using screws.

Construction workload is reduced by approx.
20 to 30%, compared to when using conventional ceiling method to improve the seismic performance.

High Seismic Performance to Withstand a Horizontal Load Equivalent to 2.2G.

Our new method showed a high seismic performance of 4,000 N with respect to the allowable ceiling proof stress in the "unit test" (static pressurization test) designated by the Ministry of Construction (the current Ministry of Land, Infrastructure, Transport and Tourism. (*In-house test result)

*Construction is performed in accordance with "Practical Guide on the Technical Standards concerning Measures to Prevent the Fall of Ceilings in Buildings" based on Notification No.771 of the Ministry of Land, Infrastructure, Transport and Tourism.

Improved Safety with Light-weight Rock Wool Decorative Acoustic Boards

It is proved in our laboratory test that our rock wool decorative acoustic boards have a low risk to human life in the event of falls.

Reference: Dummy Head Test
The impact force was measured by allowing each material to fall from the specified height.
It is considered that there is a low risk to human life if the impact force is 2,000 N or less.

One-push Underlayment Installation Combined with Excellent Workability to Realize a Short Construction Period

The new method contributes to the reduction of construction workload because the number of seismic braces is reduced.