Hat Ring Method for Suppressing Manhole Uplift during Earthquakes

Can be installed in both existing and new setups! A floating suppression method that does not affect the manhole during normal conditions.

The "Hattrling Method" is a technique that utilizes the weight of the blocks and the backfill soil on top of the blocks to suppress the uplift of manholes. This method can be applied not only to existing manholes in urban areas, which are significantly affected by uplift, but also to newly installed manholes. It does not create holes in the manhole or obstruct the internal cross-section, and it is designed to suppress uplift only when it is about to occur, so there is no constant load applied. 【Features】 ■ Can be installed on both existing and new manholes ■ Does not affect the manhole ■ No increase in inertial forces due to seismic motion ■ Easy installation and low cost ■ Obtained technical evaluation under the Japan Society of Civil Engineers' technical evaluation system *For more details, please refer to the PDF materials or feel free to contact us.

Manhole bodyEarthquake-resistant construction methodGround foundation construction method