List of Road, bridge and tunnel materials products
- classification：Road, bridge and tunnel materials
406～450 item / All 3134 items
Easily connect pipes with different outer diameters! A fitting suitable for emergency repairs of buried pipes.
- others
Variable invert pouring is possible! Ideal for locations such as national roads where a 500 mm apron width is required! Includes construction examples.
- Gutters and U-shaped gutters
Suitable for places where the outer line interferes with the apron, such as central medians! Compatible with drainage pavement! Includes construction examples.
- Gutters and U-shaped gutters
The standard size accommodates from 300×400 to 300×1500! Compatible with T-25 cross sections! Includes construction examples.
- Gutters and U-shaped gutters
Excellent sound insulation and durability. Easy maintenance after installation, effective for cost reduction! Includes case studies.
- Gutters and U-shaped gutters
Registered product of the Ministry of Land, Infrastructure, Transport and Tourism's "NETIS" / Ibaraki New Technology Information System "IT'S"! Includes construction examples.
- Gutters and U-shaped gutters
A lineup of cross-sectional products, including underground types and grating drainage types! With construction examples included.
- Gutters and U-shaped gutters
Lightweight, easy to install, and economical! Water channel flume compatible with cross-sections from 250 to 600! Includes installation examples.
- Gutters and U-shaped gutters
It has a scouring effect, making it difficult for sediment to accumulate! Variable invert pouring is possible! Includes construction examples.
- Gutters and U-shaped gutters
We offer various products such as pedestrian and vehicle boundary blocks that can be used for deep groove circular side ditches! With construction examples included.
- Gutters and U-shaped gutters
The standard sizes range from 300×400 to 300×1500! Resistant to sediment accumulation! Includes construction examples.
- Gutters and U-shaped gutters
The standard sizes range widely from 300×400 to 300×1500! The bottom surface of the water channel is circular, providing a flushing effect! Includes construction examples.
- Gutters and U-shaped gutters
Dirt and sand are difficult to accumulate! The grating can be removed, making cleaning easy! Includes construction examples.
- Gutters and U-shaped gutters
A slim product with a grating-type drainage channel! The circular bottom of the waterway provides a flushing effect! Includes construction examples.
- Gutters and U-shaped gutters
Top lifter compatible! The price is less than half that of our own grating products! Adopted for design at Sendai Freight Terminal Station! Available for delivery to other prefectures!
- Gutters and U-shaped gutters
【Safety Assurance】Outstanding visibility with a sign height of 1,100mm, one of the largest in the industry! Can also be used as a substitute for arrow boards and traffic cones.
- Road signs and road accessories
We offer various types of plastic extrusions. Please consult us for mold production, prototyping, and mass production. We also accept orders for our products.
- Tunnel Materials
2025 Good Design Award" winner! Mitsuba Drain has also been selected as "My Chosen Item.
The announcement of the 2025 Good Design Award (organized by the Japan Design Promotion Association) was made on October 15, 2025. This time, Nihon Doren Co., Ltd. received two Good Design Awards. Additionally, the focused drainage pipe "Mitsuba Doren" was selected for the special selection "My Chosen Item" by the Good Design Award judging committee. It has been highly evaluated as an excellent design that merges traditional wisdom with modern technology.
We respond to our customers' needs with skilled techniques such as plastic bending, adhesive processing, and welding.
- Tunnel Materials
2025 Good Design Award" winner! Mitsuba Drain has also been selected as "My Chosen Item.
The announcement of the 2025 Good Design Award (organized by the Japan Design Promotion Association) was made on October 15, 2025. This time, Nihon Doren Co., Ltd. received two Good Design Awards. Additionally, the focused drainage pipe "Mitsuba Doren" was selected for the special selection "My Chosen Item" by the Good Design Award judging committee. It has been highly evaluated as an excellent design that merges traditional wisdom with modern technology.
Can accommodate various terrains and structures! Leak-proof gutters made of non-combustible materials.
- Tunnel Materials
2025 Good Design Award" winner! Mitsuba Drain has also been selected as "My Chosen Item.
The announcement of the 2025 Good Design Award (organized by the Japan Design Promotion Association) was made on October 15, 2025. This time, Nihon Doren Co., Ltd. received two Good Design Awards. Additionally, the focused drainage pipe "Mitsuba Doren" was selected for the special selection "My Chosen Item" by the Good Design Award judging committee. It has been highly evaluated as an excellent design that merges traditional wisdom with modern technology.
Improving the durability and workability of leak-proof gutters! Soft P.V.C. gutters made from flexible materials.
- Tunnel Materials
2025 Good Design Award" winner! Mitsuba Drain has also been selected as "My Chosen Item.
The announcement of the 2025 Good Design Award (organized by the Japan Design Promotion Association) was made on October 15, 2025. This time, Nihon Doren Co., Ltd. received two Good Design Awards. Additionally, the focused drainage pipe "Mitsuba Doren" was selected for the special selection "My Chosen Item" by the Good Design Award judging committee. It has been highly evaluated as an excellent design that merges traditional wisdom with modern technology.
The most weather-resistant reinforced glass curved mirror, with a mirror surface that has high affinity with water, allowing rainwater to wash away dirt, keeping it clean for a long time and making ma...
- Road signs and road accessories
Finish the concrete surface in an optimal condition! Angle adjustment of the float pan is possible!
- Paving Materials
A concrete finisher that is easy to handle, achieving reduced construction time and improved construction quality!
- Paving Materials
We are taking a step towards a circular society by protecting the limited resources of the Earth!
- Various blocks
- Paving Materials
For general drainage ditches such as on-site casting. Additionally, for drop-in type grates, drainage covers, and drainage covers with special dimensions.
- Grating
The new "2024-2025 Comprehensive Catalog" has been released! New grating products included!
The new "2024-2025 Comprehensive Catalog" from Okagreat Co., Ltd. has been released! It features many original products and grating, including "Safety Walker" and "OG Lock U"! New types of grating such as "Safety Walker," "OG Lock U," "Premium Expand," and "Neo Slit" OG Super High Tensile High Strength Stainless Steel Grating "Fine Grate" are included. Many original products and gratings are featured! If you're looking for something a bit different from conventional grating, something you've never seen before, or grating that better matches the landscape, you might find it in this catalog. High heels and canes won't get stuck. Trash and small stones won't clog. Slip-resistant effects are expected. Theft prevention. Prevents wobbling, and tires from road bikes or sports-type bicycles won't fit, nor will the wheels of carts, carry cases, or hand trucks, and so on. This catalog addresses your grating concerns. If you would like a copy of the new "2024-2025 Comprehensive Catalog," please feel free to contact us.
Laser processing and hot-dip galvanizing finish for striped steel plates! For tunnel inspection road installation work, please let us know your requests for "products like this."
- Road facilities
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High Ten Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
A solid feeling at your feet. The evolving shape of the grating, "Safety Walker."
- Grating
The new "2024-2025 Comprehensive Catalog" has been released! New grating products included!
The new "2024-2025 Comprehensive Catalog" from Okagreat Co., Ltd. has been released! It features many original products and grating, including "Safety Walker" and "OG Lock U"! New types of grating such as "Safety Walker," "OG Lock U," "Premium Expand," and "Neo Slit" OG Super High Tensile High Strength Stainless Steel Grating "Fine Grate" are included. Many original products and gratings are featured! If you're looking for something a bit different from conventional grating, something you've never seen before, or grating that better matches the landscape, you might find it in this catalog. High heels and canes won't get stuck. Trash and small stones won't clog. Slip-resistant effects are expected. Theft prevention. Prevents wobbling, and tires from road bikes or sports-type bicycles won't fit, nor will the wheels of carts, carry cases, or hand trucks, and so on. This catalog addresses your grating concerns. If you would like a copy of the new "2024-2025 Comprehensive Catalog," please feel free to contact us.
Essential item as a cover for concrete secondary products "U-shaped gutters." We have a proven track record of numerous deliveries for public and private construction projects. A standard product for ...
- Gutters and U-shaped gutters
The theft prevention for U-shaped drainage grates is also effective in preventing rattling noise. It does not require the installation of fasteners for concrete secondary products and is a tightly fix...
- Secondary paving products
When you want to know, 'What types of vehicles can the grating's load capacity handle?' ... for your reference... the end.
- Grating
We have uploaded information regarding the load capacity of the grating and the types of vehicles that can traverse it. We hope you find it helpful.
We have uploaded information regarding the load capacity and types of vehicles that can use the "grating" handled by Okagreat Co., Ltd. This is for reference in case you want to know, "What types of vehicles are safe for the load capacity of the 'grating'?" 【Load Types】 T-25, Total Weight W=25 tons, Vehicle Examples: Trailers, etc., Rear Wheel Load per Wheel: 100 kN, Wheel Contact Area: 20cm×50cm T-20, Total Weight W=20 tons, Vehicle Examples: Large Trucks, Dump Trucks, etc., Rear Wheel Load per Wheel: 80 kN, Wheel Contact Area: 20cm×50cm T-14, Total Weight W=14 tons, Vehicle Examples: Large Buses, Medium Trucks, etc., Rear Wheel Load per Wheel: 56 kN, Wheel Contact Area: 20cm×50cm T-6, Total Weight W=6 tons, Vehicle Examples: Small Trucks, etc., Rear Wheel Load per Wheel: 24 kN, Wheel Contact Area: 20cm×24cm T-2, Total Weight W=2 tons, Vehicle Examples: Regular Passenger Cars, etc., Rear Wheel Load per Wheel: 8 kN, Wheel Contact Area: 20cm×16cm *For more details, please visit our website. You can view the introduction page or check the PDF materials and URL links.
"Curved mirrors" provide safety and security beyond the corner. At the bend, there is a "curved mirror." An essential item for traffic infrastructure. Towards a safer traffic environment.
- Road signs and road accessories
"Grating Theft Prevention Chain!" (Includes chain, anchor, and shackle) The standard for preventing grating theft! Protect grating with a chain!
- Grating
The slit cover is made of steel with a galvanized finish, and the receiving frame is also made of steel with a galvanized finish. For U150, U180, U240, U300.
- Gutters and U-shaped gutters
The slit cover is made of stainless steel SUS304, and the frame is made of SUS jointed steel with a galvanized finish. For U150, U180, U240, U300.
- Gutters and U-shaped gutters
The slit cover is made of stainless steel SUS304, and the receiving frame is also made of SUS. For U150, U180, U240, U300.
- Gutters and U-shaped gutters
OG Super High-Tensile High-Strength Stainless Steel Grating New Model! 'Fine Great'! Exhibits high durability performance even under loads in the 'twisting' direction!
- Gutters and U-shaped gutters
The grating is clogged with small stones and debris, making it look unappealing... But with the "Safety Walker," due to its design, it is less likely to get clogged, is durable, and lightweight.
- Grating
We have uploaded information regarding the load capacity of the grating and the types of vehicles that can traverse it. We hope you find it helpful.
We have uploaded information regarding the load capacity and types of vehicles that can use the "grating" handled by Okagreat Co., Ltd. This is for reference in case you want to know, "What types of vehicles are safe for the load capacity of the 'grating'?" 【Load Types】 T-25, Total Weight W=25 tons, Vehicle Examples: Trailers, etc., Rear Wheel Load per Wheel: 100 kN, Wheel Contact Area: 20cm×50cm T-20, Total Weight W=20 tons, Vehicle Examples: Large Trucks, Dump Trucks, etc., Rear Wheel Load per Wheel: 80 kN, Wheel Contact Area: 20cm×50cm T-14, Total Weight W=14 tons, Vehicle Examples: Large Buses, Medium Trucks, etc., Rear Wheel Load per Wheel: 56 kN, Wheel Contact Area: 20cm×50cm T-6, Total Weight W=6 tons, Vehicle Examples: Small Trucks, etc., Rear Wheel Load per Wheel: 24 kN, Wheel Contact Area: 20cm×24cm T-2, Total Weight W=2 tons, Vehicle Examples: Regular Passenger Cars, etc., Rear Wheel Load per Wheel: 8 kN, Wheel Contact Area: 20cm×16cm *For more details, please visit our website. You can view the introduction page or check the PDF materials and URL links.
The appearance of the grating... It's clogged with small stones and debris. But with the "Safety Walker," due to its design, it's hard to get clogged, durable, and lightweight.
- Grating
The new "2024-2025 Comprehensive Catalog" has been released! New grating products are included!
The new "2024-2025 Comprehensive Catalog" from Okagreat Co., Ltd. has been released! It features many original products and grating, including "Safety Walker" and "OG Lock U"! New types of grating such as "Safety Walker," "OG Lock U," "Premium Expand," and "Neo Slit" OG Super High-Tensile High-Strength Stainless Steel Grating "Fine Grate" are included. Many original products and gratings are featured! If you're looking for something a bit different from conventional grating, something you've never seen before, or grating that better matches the landscape, you might find it in this catalog. High heels and canes won't get stuck. Trash and small stones won't clog. Slip-resistant effects are expected. Theft prevention. Wobble prevention, tires of road bikes and sports-type bicycles won't fit, and wheels of carts, carry cases, and hand trucks won't get stuck, among other issues. This catalog addresses your grating concerns. If you would like a copy of the new "2024-2025 Comprehensive Catalog," please feel free to contact us.
A safety walker installed at a famous ramen shop as a measure against large vehicle entrances and exits. It is structurally resistant to clogging, durable, and lightweight. The flatness feels great.
- Grating
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
Tunnel audit road installation work, etc., with laser processing and hot-dip galvanizing finish on corrugated steel plates! Please let us know your requests for "products like this."
- Tunnel Materials
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
The new model of OG Super High Tensile High Strength Stainless Steel Grating, "Fine Great"! It demonstrates high durability performance even under loads in the "twisting" direction!!
- Gutters and U-shaped gutters
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
"Safety Walker" installed at golf courses of companies listed on the Tokyo Stock Exchange Prime. It is designed to be resistant to clogging, durable, and lightweight. It has a good flat feel.
- Secondary paving products
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
OG Super High-Tensile High-Strength Stainless Steel Grating New Model! 'Fine Great'. Exhibits high durability performance even under loads in the 'twisting' direction!
- Grating
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
No need to attach fixtures to concrete secondary products. The grating for U-shaped gutters is securely fixed! Effective for theft prevention and reducing rattling noise. Easy to install.
- Grating
We have renewed our homepage. A variety of the latest grating products are now featured. (Okagrate Co., Ltd.)
We have renewed our homepage. A variety of the latest grating products are now featured. Awarded the Good Design Award, the new type of grating "Safety Walker" High-strength OG Super High-Tensile Grating made of stainless steel using a new manufacturing method "Fine Grate" Easy-to-fix grating for U-shaped ditches and striped steel plate covers "OG Lock Series" Barrier-free grating "Neo Slit" Pursuing slip resistance, safety, and design "Premium Expand" Wooden grating made from recycled thinning materials "Eco Wood Grating" Environmentally friendly grating using recycled plastic chips "Eco Pla Grating" And many more are featured.
Channel cover cap for sealing the handle hole of concrete channel covers! It caps the handle hole of concrete channel covers to prevent coins, keys, and other items from falling in!
- Secondary paving products
We have prepared various channel widths for U-shaped gutters: U120, U150, U180, U240, U300, U360, U400, U450, U500, U600.
- Grating
The new "2024-2025 Comprehensive Catalog" has been released! New grating products included!
The new "2024-2025 Comprehensive Catalog" from Okagreat Co., Ltd. has been released! It features many original products and grating, including "Safety Walker" and "OG Lock U"! New types of grating such as "Safety Walker," "OG Lock U," "Premium Expand," and "Neo Slit" OG Super High Tensile High Strength Stainless Steel Grating "Fine Grate" are included. Many original products and gratings are featured! If you're looking for something a bit different from conventional grating, something you've never seen before, or grating that better matches the landscape, you might find it in this catalog. High heels and canes won't get stuck. Trash and small stones won't clog. Slip-resistant effects are expected. Theft prevention. Prevents wobbling, and tires from road bikes or sports-type bicycles won't fit, nor will the wheels of carts, carry cases, or hand trucks, and so on. This catalog addresses your grating concerns. If you would like a copy of the new "2024-2025 Comprehensive Catalog," please feel free to contact us.