Based on the design, manufacturing, and building technologies we acquired through our experience in building ships, bridges, water gates, and ocean structures, since 1955 we have recorded building more than 200 steel stacks in Japan and overseas and contributed to creating social infrastructure. In addition to new installations of ultra-tall stacks reaching around 200 meters and stacks incorporating an earthquake-proof system, we can respond to customers requirements with our total engineering capabilities from design to onsite construction including repairs, reinforcing works, and diagnosis of earthquake-proof performance of existing facilities that are growing in number these days.
The typical design of an ultra-tall stack is a pylon-supported stack in which the steel stack body is supported by a pylon. The pylons also serve as scaffolding for maintenance purposes, thus reducing ongoing operating costs. In the building method, which we developed before other companies, we use the jack-up method, which enables the welding of stack bodies on the ground.
Recently when stacks are to be installed in the suburb of a town, it is indispensable to build a stack that fits in with the surrounding scenery. We propose, in addition to conventional stacks, a new stack design that has both economical efficiency and esthetic features such as our super-membrane stacks.
Inspection / diagnosis / repair
Hitachi Zosen inspects and diagnoses existing steel chimneys based on our high technological capability and abundant experience that have enabled us to provide integrated support for design, manufacturing, and construction. We also propose repair methods according to the deterioration situation, provide repair work, and respond with total engineering from design to on-site construction. In addition to inspecting and repairing the inside of chimneys during suspended operation, Hitachi Zosen also considers reinforcement for chimneys during operation.
Seismic diagnosis / seismic retrofitting
Chimneys over 6 meters in height are subject to the Building Standards Act. Chimneys that were built a long time ago may not meet current standards due to legislative changes. Hitachi Zosen performs seismic diagnosis*1 for aged chimneys, and proposes and implements seismic retrofitting as necessary. We also have a track record of receiving commendations for our seismic retrofitting work.*2
- *1Hitachi Zosen is not a Designated Performance Evaluation Organization. Therefore, we do not carry out performance evaluation work.
- *2Kenchiku Bosai Foundation; 2018 Seismic Retrofit Excellent Building Award
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