ヤマヨ商事 List of Products and Services

The parabolic-shaped cut surface means that the weight of passing vehicles is distributed by the parabolic curve, demonstrating that it can reliably withstand large loads. The portable cutter and simplified equipment minimize the traffic regulation area, making daytime construction more feasible. For more details, please contact us or download the catalog.

• Manhole body
• Other civil engineering works
• Renovation and repair methods

For the installation work of manhole covers, we recommend the Parabola method using a parabolic cutter. The Parabola method is a new technique that cuts the asphalt surface into a circular spherical shape for the replacement and repair of manhole iron covers. It finishes the work neatly and accurately. The parabolic cross-section has excellent adhesion and there is no wobbling after construction.

• Manhole body
• Dam construction
• Water Supply Facilities

The guardrails manufactured by Nippon Steel & Sumitomo Metal Corporation are essential for discussing road safety in Japan. They have received high evaluations for both safety and durability.

• Protective fence
• Dam construction