List of Civil Engineering Materials products

We provide asphalt mixtures manufactured at our own plant along with reliable technology.

• Inspection hatches, manhole covers, and ditch covers
• Manhole body

Please leave the design and manufacturing of short tubes and loose short tubes to us.

• Water Treatment
• Water and sewerage pipe fittings
• Other measuring instruments

A rainwater storage structure that achieves high intensity and lightweight! The actual void ratio after assembly is over 95%. It is active in public facilities, commercial facilities, welfare faciliti...

• Rainwater tank

From retaining walls to blocks. Leave the manufacturing of precast concrete to us.

• Concrete Retaining Wall
• Various blocks

This is material for a "rice paddy dam." By attaching it to the drainage box in the field, it helps to prevent rainwater from flowing out of the field during heavy rainfall.

• Agricultural civil engineering works
• Disaster prevention supplies
• Flood prevention facilities, fire tanks, and flood control ponds

For troublesome weeds! A granular type of herbicide that is easy to use even in places without water sources, such as parking lots and vacant lots.

• Soil improvement material

Just sprinkle the granules on the soil! Introducing a herbicide that suppresses weed growth for a long time.

• Soil improvement material

A rockfall protection fence that can be easily installed on the top of existing structures! No reinforcement or elevation of the structure is necessary during installation! For rockfall measures, use ...

• Protective fence

Riverbank protection works that consider the natural environment, the human body, and fish species! Construction efficiency will improve.

• Baskets and futon baskets

High-strength, rigid net-type sheet! Easy to transport and lay down manually.

• Civil Engineering Sheet

Lift snow and sheets together for easy removal! Registered with NETIS Plus.

• Civil Engineering Sheet

All-weather cold mix asphalt that can be used for pavement defects even in low temperatures.

• Reinforcement and repair materials
• Paving Materials

High durability and high strength! Effective for areas where pavement repairs are conducted in a short cycle.

• Paving Materials
• Secondary paving products

Can you quickly and safely ascend and descend the stairs in the event of a power outage or in darkness to evacuate?

• Other park materials

"Zero cases of brightness degradation" JIS Z 9097, 9098 Class II, and 9096 fully compliant products regarding disaster type evacuation guidance signs.

• Bridge Materials

Three products: YF-GVA-110, YF-GVB-110, and YF-GVC-110 are now available!

• Protective fence

Three products in the lineup: YF-GSA-080/110, YF-GSB-080/110, YF-GSC-080/110!

• Protective fence

By simply mixing alkaline ion water with cutting fluid, you can improve processing efficiency, prevent the spoilage of cutting fluid, and simultaneously achieve increased productivity, cost reduction,...

• others
• Building Cleaning Equipment
• Soil improvement material

A water quality purification system that reduces and removes blue-green algae and unpleasant odors. I highly recommend this for those involved in water environment in municipalities and construction c...

• Soil improvement material

We offer a lineup of recycled wood grating that utilizes the natural texture of materials and rubber field covers.

• Grating

It functions diversely according to its use and purpose.

• Grating

This is a steel grating that can be selected according to the place of use and purpose.

• Drainage and ventilation equipment
• Inspection hatches, manhole covers, and ditch covers
• Grating

Maintains road safety with excellent durability.

• Inspection hatches, manhole covers, and ditch covers
• Grating

Enhance the image of the entrance, which is the face of the building.

• Shopping district, entrance area, eaves
• Exterior and paving materials <General>
• Grating

This is a reliable manhole cover essential for road maintenance.

• Inspection hatches, manhole covers, and ditch covers
• Manhole body
• Sewerage facilities

You can easily and freely cut the paving material.

• Other park materials
• Exterior and paving materials <General>
• Gardening supplies

It is a resin grating that is gentle on bare skin.

• Grating

We will ensure smooth rainwater drainage.

• Waterproof tape, adhesive, drain, protective panel
• Drainage material

Guidance for the walking direction of visually impaired individuals.

• Paving Materials
• Safety devices for the visually impaired

It is a manhole cover for stop valves, sprinklers, and water meters.

• Manhole body

Support for zero accidents! Improvements through safety and security measures support, as well as labor-saving and energy-saving measures.

• Piping materials (copper pipes, cast iron pipes)

Increase microorganisms for fluffy soil. Promote the growth of roots and stems with abundant nitrogen.

• Fertilizers and Pesticides

This is an acrylic sheet made using a transparent casting method that emphasizes workability. It has excellent thickness precision and, due to its high molecular weight, exhibits minimal warping and e...

• Piping materials (concrete pipes)

This is the comprehensive catalog of Rontai Co., Ltd.! It includes not only our own products such as vegetation sheets, mats, and sandbags, but also information on the necessity of slope greening.

• Slope protection material

Two functions on one land! Free design is possible according to the layout shape.

• Flood prevention facilities, fire tanks, and flood control ponds

It can withstand falling rocks with kinetic energy below 6.2 kJ! Excellent cost-effectiveness.

• Protective fence

It enables installation in areas where safety was given up due to the inability to build protective fences until now!

• Protective fence

Shallow soil coverage allows for the installation of short and safe protective fences! Achieving a shortened construction period.

• Protective fence

Achieve smooth vehicle operation without gradient changes! Numerous combinations of main unit and base available.

• Gutters and U-shaped gutters

The outer diameter R can accommodate down to a minimum of 10R! Due to its bolt connection structure, materials like concrete are not required.

• Protective fence

Here is the list of products made using natural resource "Wara"! ◎

• Civil Engineering Sheet