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Steel Structures

We can provide high-tensile strength steel welding technology that we gained by manufacturing of the Honshu-Shikoku Bridge.

Large-scale canning and welding products fabricated by world-class facilities


  1. 1. Marine transportation of large-scale canning products is available.
  2. 2. Handling Capacity of the Jib crane is 320 tons or less.
  3. 3. Manufacturing of extra thickness steel structures based on pressure vessels is available.
  4. 4. OEM supply of construction machines (crawler crane and mining machine)


Steel structures for harbor facilities

Manufacturing of hybrid caissons, jackets, pontoons, dock gates, dock doorstops, discharge pipes, and river gates.

Hybrid caisson for Yokosuka port

Jacket for break water for Yuge port

Pontoon for Mishima-Kawanoe port

Submerged tunnel for Naha port

Steel frame for nuclear power plant

Large-scale steel structures

Manufacturing of GC girders, JC portals, piers, converters and large pots for molten steel.

Construction machines

Manufacturing of crawler cranes and mining machines.



Mobile crane

Oil field shovel

Swing frame

Side frame


Max. hanging capability: 320t/2 devices

Max. plate thickness: 400 mm

Max. plate thickness: 100 mm

Max. processing table diameter: 13 m

Annealing furnace

12 m (W) x 12 m (H) x 25 m (L)


Are you experiencing problems? Our steel structures can help you resolve these problems.

Can you weld special materials?
For special materials in large-scale steel structures, please contact us.

We handle all welding operations using qualified personnel who are JIS- and ASME-certified.

Is the maritime transportation of a large-scale structures possible?
Yes, because such structures are manufactured in a dry dock and quay utilizing the bearing power of soil.

Bearing power of soil: Supports 45t per square meter in a dry dock and 25 to 45t per square meter at a quay.

Are processes such as cutting, manufacturing, nondestructive inspection, and coating possible at the Saijo plant?
Yes, the Saijo plant provides NC cutting, linac, and coating-factory facilities.

This plant also has other facilities, so conveyance between facilities is performed using hand trucks and tower cranes.

Steel Structures consultation

Telephone/Fax Inquiries

Tel: +81-898-64-6958

Fax: +81-898-64-6973

Web Inquiries

Inquiry Form