ケイコン List of Products and Services

We handle box culverts and KC box culverts that are certified materials by the National Box Culvert Association, the Japan Sewage Works Association Class I, and products certified by JIS standards. These comply with the "Guidelines for Road Earthwork Culverts" by the Japan Road Association. We also offer KC types that conform to the above standards. Please feel free to contact us if you have any requests. *For more details, please download the PDF or contact us.

• Sewerage facilities

The SP Green III type allows for a reduction in construction time through the use of heavy machinery for the installation of large concrete products, as indicated by the speed soil retention prefabricated method. 【Features】 ○ The shape of the SP Green III type consists of a single retaining wall structure, providing significant stability, and when assembled, it becomes a robust structure as a retaining wall. ○ There is no particular need for watering management. ○ The planting space is large, allowing for a wide range of vegetation from low shrubs to medium-sized trees to thrive. Therefore, the landscape can be restored to a state close to its natural condition after construction. ● For other functions and details, please contact us.

• Retaining wall

It is now easy to plant using pot seedlings or seed-filled vegetation bags on steep slopes (1:0.5) that were traditionally considered difficult for masonry retaining walls. 【Features】 ○ Cost By providing a Coco-A-Mat (planting base) on the back of the block front wall, soil replacement work is eliminated, making it economical. ○ Planting Base Coco-A-Mat (planting base) is typically made from discarded coconut fiber scraps and coconut shells, and it has a mechanism to enhance water retention (with water-retaining materials). ○ Maintenance The shape of Coco-A-Green is designed to direct rainwater from the block surface to the planting base, allowing for reduced maintenance. ○ Suitable Plants Please refer to the Coco-A-Green planting manual. ○ Greening Coco-A-Green can be configured with various planting variations according to the surrounding environment. *For more details, please inquire.

• Retaining wall

The shape of the pot and the leaf area of the trees allow us to determine the number of dry days (the number of days that can withstand drying out), enabling us to select the appropriate trees for planting. 【Features】 ○ The shape of the block has a complete pot shape inside, so there is no concern about the inner filling soil flowing out. ○ By pouring concrete on both sides of the reinforced concrete block in both vertical and horizontal directions, continuity is achieved, ensuring strength (shear resistance) equal to or greater than that of stacked blocks across the entire cross-section. ○ Construction involves stacking the products one layer at a time, pouring backfill (reinforced) concrete, and then repeatedly adding backfill (inner filling) soil until the specified height is reached. *For more details, please inquire.

• Retaining wall

Unlike other greening blocks, this product does not use backfill crushed stone, which significantly improves workability. At the same time, it prevents the hollowing phenomenon where compost soil and sediment within the block flow out into the backfill crushed stone, as well as the stunted growth and death of trees caused by their roots being obstructed by the backfill crushed stone. 【Features】 - By pouring core concrete, it becomes a masonry retaining wall that can be used up to a standard height of approximately H=5.0m. - By incorporating rebar within the core concrete, it forms a reinforced concrete retaining wall structure with a completely integrated and robust beam, allowing it to be used as a high retaining wall over 5m, capable of withstanding soil pressure, uneven settlement, and earthquakes. ● For other functions and details, please contact us.

• Retaining wall

The KBW method is a new concept for large block retaining walls that consists of a base slab, front wall, and counter wall, with large blocks (2.0 m²) stacked vertically. 【Features】 - The blocks can be combined with base slabs of varying lengths. - Stability is ensured as the base slabs of the blocks lock the backfill soil securely at every 1-meter height. - Constructability allows for simple repetitive tasks of block installation and backfilling with on-site generated soil, enabling more than 40 m² of construction per day. - Economic efficiency is achieved by using on-site generated soil as backfill material, significantly shortening construction time and providing a rational and economical retaining wall construction without waste. - Aesthetic appeal is enhanced by surface finishing with decorative formwork, giving a beautiful appearance as a factory product that improves the landscape of the installation site. *For more details, please inquire.*

• Retaining wall
• Earthworks
• Pile and foundation work

Due to the vertical embankment, the land area required is minimized, allowing for effective land use. 【Features】 ○ Because it uses standardized prefabricated construction methods, skilled labor or special techniques are not required, enabling a reduction in construction time. ○ Compared to conventional retaining walls, it offers a lower cost and allows for high vertical embankments. ○ All materials used are standardized products manufactured under strict quality control at factories certified by the Japan Tail Arm Association, ensuring safety on site. ○ The flexible structure distributes the load evenly onto the foundation ground, making it adaptable to a wider range of ground conditions. ○ The construction is mostly quiet, primarily consisting of combinations of standardized products, and generally does not require piling, resulting in minimal noise and vibration. ● For other functions and details, please contact us.

• Retaining wall

In response to the amendment of the Land Development and Urban Planning Act (2006), it is designed to withstand major earthquakes (horizontal seismic intensity kh = 0.25). 【Features】 ○ This is a product certified by the Minister of Land, Infrastructure, Transport and Tourism based on Article 14 of the Enforcement Order of the Land Development and Urban Planning Act. It can be used within regulated areas for land development work. ○ The height of the retaining wall is standardized in 100mm increments from 1.0m to 3.0m, and corner products (90°, 135°) are also available. ○ The surface of the retaining wall can be finished. The designed surface enhances the quality of the residence. ● For other functions and details, please contact us.

• Retaining wall

This is an L-shaped retaining wall that reflects the results of seismic experiments and analyses conducted at the Ministry of Construction's Building Research Institute (at that time). 【Features】 ○ The required ground bearing capacity for the foundation has been established. ○ By providing a cover of 4 cm for the rebar, it has a durability of 100 years. ○ It is a uniform product with thorough quality control due to factory production. ○ Mechanized construction allows for shortened construction periods and labor savings. ○ The front wall is nearly vertical, enabling effective use of land. ○ It is possible to design the front wall, allowing for choices of "individuality" and "harmony." (Optional) ○ A fence can be integrated and constructed at the top of the front wall. *Please contact us for more details.

• Retaining wall
• Earthworks
• Pile and foundation work

The rear wall is integrated, so there is no need for assembly and disassembly of the backing formwork. Additionally, it is a large block retaining wall that allows for efficient pouring of concrete and placement of backfill materials. 【Features】 ○ The use of joint pins for connecting the blocks ensures precise installation and prevents shifting. ○ In standard straight sections, installation of 30m² per day is possible. *Please contact us for more details.

• Retaining wall
• Earthworks
• Pile and foundation work

New Steep Slope Stabilization Method The PAN (Panel And Nail) Wall method is based on the theory of the cut slope reinforcement method, which is one of the steep slope stabilization methods. Features: 1. The basic construction method involves reverse wrapping, finishing the structure from top to bottom, which eliminates unnecessary excavation and backfilling work, thereby reducing the amount of earthwork. 2. The excavation cross-section is minimized, which reduces the impact on the surrounding environment such as forests and green spaces. 3. The precasting of surface protection works allows for shortened construction periods and labor savings. 4. Concrete panels are produced in factories, ensuring high quality and a variety of surface designs. 5. There is minimal occurrence of high-altitude work, making this method extremely safe. *For more details, please contact us.

• Retaining wall
• Earthworks
• Pile and foundation work

By combining them in a grid pattern, the entire retaining wall becomes a structure with drainage capability, allowing for the rapid drainage of spring water. 【Features】 ○ The flexible nature of the joints allows for adaptability to ground deformation. ○ Manufactured in a factory with strict quality control, resulting in components with high dimensional accuracy. ○ After assembling the components, backfilling work can be carried out immediately. ● For other functions and details, please contact us.

• Retaining wall
• Earthworks
• Pile and foundation work

The tetra frame can be applied as a vegetation construction by using infill within the frame as turf work, and it can also be used as a surface protection work by employing infill with crushed stones, cast-in-place concrete, or inner covers. 【Features】 ○ Compared to the conventional method of assembling rod-shaped blocks, the labor of assembling each piece on-site is reduced, shortening the construction period to about one-fourth, and enabling labor-saving and mechanization through machine construction. ○ Since the grid is already formed from the beginning, there is no distortion in the rectangular shape, and the strength is also increased. Additionally, there is no risk of movement or deformation, and the assembled blocks function as a single unit, allowing for the easy creation of robust and durable slopes. ○ The stacking limit is approximately 10 layers for the 15 cm thickness type (slope length 10.15 m) and about 15 layers for the 20 cm thickness type (slope length 15.15 m). *For more details, please contact us.

• Retaining wall
• Pile and foundation work
• Concrete Machinery

The combination of grid points is in a "swastika" shape, so there is no risk of deformation during movement. The iron wire protruding from the block body connects the blocks to each other, allowing for easy and safe construction. 【Features】 ○ The infill within the frame can be constructed using methods suitable for the site, such as turf, gravel, intermediate blocks, and concrete cover. ○ If there is spring water, drainage can be improved using intermediate porous concrete blocks. * Please note that some regions may not carry this product, so please contact your local sales office. ○ It can also be used as a fire prevention measure for the base of the wall. * There is also a sister product, the fireproof cover block "E.C Block." ● For other functions and details, please contact us.

• Slope protection material
• Earthworks
• Pile and foundation work

By completing the embankment filling method in a single process, secondary processes such as concrete filling, gravel filling, and rock filling, which are traditionally required in embankment methods, can be omitted. The use of simple heavy machinery ensures good workability and is, of course, a labor-saving method that also helps prevent slope fires. 【Features】 - The elimination of filling means that natural resources such as gravel for filling are no longer needed, making it a resource-saving method. - By allowing groundwater and rainwater to flow through the drainage channels at each joint surface, it can prevent discoloration of the slope surface. *For more details, please inquire.

• Retaining wall
• Earthworks
• Pile and foundation work

The manufacturing of box culverts is conducted in accordance with the factory certification system of the Japan Sewage Works Association, and is subject to regular rigorous quality control checks under the association's inspection system. The certification system of the Japan Sewage Works Association covers all general matters related to box culverts, including product quality, manufacturing facilities, and quality management systems, and only factories that pass the inspection are certified. Our company has received this factory certification, and the box culverts produced there bear the certification mark of the association. For other functions and details, please contact us.

• Dam construction
• Water Supply Facilities
• Sewerage facilities

The upper part is arch-shaped and the lower part is box-shaped, allowing the load on the upper part to be transmitted as axial compressive force. This significantly reduces the bending moment occurring in the upper part and side walls of the member compared to a box shape, enabling it to have high strength. 【Features】 ○ The arch culvert ensures high watertightness by using rubber rings at the joints. ○ There is no concern about leakage due to the use of rubber rings. ○ The use of rubber rings simplifies construction and enhances economic efficiency by shortening the construction period. *For more details, please contact us.

• Water Supply Facilities
• Sewerage facilities

In addition to the beauty of the arch curve, the use of the tail arm method for the portal walls and wing walls also enhances the aesthetic appeal. 【Features】 ○ Designed with a three-hinge structure, allowing for a maximum member thickness of 40 cm. ○ Capable of erecting approximately 10 meters of arch members per day, which shortens the construction period. ○ The materials used are manufactured under strict quality control, ensuring safe use. ○ Immediately after the erection of the arch members, the interior side of the Texpan can be made available, minimizing traffic disruption. ○ The erection process is simple due to the repetition of the same work. *For more details, please contact us.

• Foundation construction

1. Excellent Economic Efficiency The arch and side walls are integrated structures, and the thickness of the materials is thin and economical. They also excel in durability and reliability, contributing to the reduction of maintenance costs during the service period. 2. Efficient Construction Construction involves the repeated assembly of precast components (such as wing walls and head walls) using cranes. 3. Thorough Quality Control All components are factory-produced, ensuring meticulous quality control. 4. Outstanding Architectural Beauty Not only is the arch shape beautiful, but the use of aesthetically pleasing surface decoration materials on the head wall is also possible, and this architectural beauty is widely recognized. 5. Shortened Construction Period Installation can be completed in a short time, and backfilling work can begin as soon as the installation is finished, minimizing road closures and detours. *For more details, please inquire.*

• Foundation construction
• Dam construction
• Crane and others

Each component is joined using various joining methods, and by using flexible joints at the pipe openings, excellent water-tightness can be achieved. 【Features】 ○ Cost-effectiveness and shortened construction period Compared to conventional on-site casting, the excavation width is smaller, and since it is prefabricated, rapid construction is possible. ○ Resolution of skilled labor shortages The construction is simple, alleviating the shortage of skilled workers. ○ Flexible joints with excellent water-tightness We offer flexible joints with outstanding water-tightness. *For more details, please contact us.

• Manhole body
• Water Supply Facilities
• Sewerage facilities

This is a fish passage constructed in a spiral shape by stacking blocks that divide the circumference to match the drop height of dams and weirs. This method is implemented with permission from Obayashi Corporation and Obayashi Road Corporation. 【Features】 ○ The ice harbor type and full overflow type can accommodate a wide range of fish species. ○ The circular and spiral shape minimizes the occupied area, allowing for the installation of fish passages up to approximately 10 meters in height. ○ The assembly type using common blocks offers excellent workability. ○ The higher the installation height, the lower the cost per height compared to site-cast stair-type fish passages. *Please contact us for more details.

• Spiral staircase
• Tunnel construction
• Airport facilities

This is a revetment block designed for multi-natural construction methods, featuring three functions: greening, fish nests, and fireflies. It has a moderately stable weight suitable for revetment blocks, allowing for the construction of revetments equivalent to those made with stacked blocks. 【Features】 - The interlocking of the upper and lower uneven surfaces creates a robust structure against movements in all directions. - The blocks are larger, making installation easy and economical. - By combining greening blocks and fish nest blocks, it creates a beautiful revetment that is friendly to all aspects of nature, including greenery, water, and living organisms. *For more details, please inquire.

• Airport facilities
• River construction

Compared to equivalent products made of steel wire (such as cage mats), it is easier to work with and allows for economical construction within a short construction period. 【Features】 ○ It is porous and has excellent permeability, making it suitable for the formation of ecotones. It can accommodate everything from fish nests to greening using crushed stone and sandbags. ○ It is a concrete product with high durability, which will not be destroyed by aging changes such as corrosion or wear. ○ Most of the filling work can be done with heavy machinery. Additionally, due to its flexible connections, it can accommodate curved construction and deformations such as subsidence. *Please contact us for more details.

• Aggregates and crushed stone
• Airport facilities
• River construction

We have developed a large precast open channel that can flexibly accommodate variable gradients and stepped channels. 【Features】 ○ Variable Gradient Channel We have devised a way to ensure appropriate channel gradients even in flat areas, such as reclaimed land and places with minimal road gradients. ○ Stepped Channel For channels that require water control in steeply developed residential areas or on steep slopes, we can provide a stepped construction solution. ○ Shortened Construction Period and Cost Efficiency Compared to on-site construction, we have made it possible to shorten the construction period and reduce costs. ○ We also offer a type that prevents floating (with weep holes), so please consult with our sales representatives. *For more details, please contact us.

• Dam construction
• Other civil engineering works

This is a large open channel compliant with the "NEXCO Standard Design for Drainage Structures," available in three types: for crowd loads (S0), for T-14 (S1), and for T-20 (S2). 【Features】 ○ It is listed as U Water-2, 3, 4 in the Concrete Secondary Products Market Product Catalog "Supervised by the Kinki Regional Development Bureau, April 2000," making it suitable for use as a road drainage channel. ○ Depending on the lateral load, you can choose the most economical type from the three options. Note: The lateral load considers the earth pressure up to the top of the channel. If earth pressure exceeding design conditions occurs due to slopes, separate calculations are required. ○ As a factory-produced product with thorough quality control, it offers excellent durability and consistent quality. *For more details, please contact us.

• Dam construction
• Other civil engineering works

The "Kukei waterway" is over 30% lower in height compared to circular waterways and covered open waterways (according to our company standards), allowing for a shallower bottom slab surface when used in side ditches of open-cut tunnels, resulting in significant cost savings. 【Features】 ○ Lineup The "Kukei waterway" is available in three types: basic type, type with legs, and wall-mounted type. ○ Drainage The drainage openings are provided at regular intervals, preventing the drop of large debris and improving the efficiency of cleaning operations with high-pressure washing vehicles. ○ Maintenance Independent drainage openings with sufficient drainage capacity are provided at regular intervals, preventing the drop of large debris and improving the efficiency of cleaning operations with high-pressure washing vehicles. ○ Water resistance Packing material is used in the joint areas. *For more details, please contact us.

• Bridge Construction
• Dam construction
• Other civil engineering works

This structure complies with the concrete secondary products market product catalog and is designed to withstand a total vehicle weight of 25 tons and a rear axle load of 100 kN (10 tf). 【Features】 ○ The unit weight of the soil when calculating earth pressure is set at 20 kN/m3 (2.0 tf/m3) since it is compacted subgrade material. ○ There are three types available: a no-cover type (PU1), a cover type (PU4・2), and a no-overload type (PU5). ○ It can also be used in areas where no load is applied. ○ Long U and apron can be used in combination. ○ We also offer apron types compatible with drainage pavement, so please consult with our sales representative. ○ A type with bolt-fixed grating for crossing (T-25) can also be manufactured. *For more details, please inquire.

• Gutters and U-shaped gutters
• Secondary paving products

This is a circular drainage channel that demonstrates the drainage function of permeable pavement. 【Features】 ○ It has a design structure with optimal drainage function based on rainfall experiments. ○ It features an inlet structure that pursues the thinning of permeable pavement in the collection area of the circular drainage channel. ○ The design structure is based on the design load T-25 in accordance with the concrete product catalog "Kinki Regional Construction Bureau, April 2000 Edition." ○ The circular drainage channels are connected by bolts, creating a robust structure. ○ It is a designed structure that comes as a set with the circular drainage channel and a dedicated catch basin. *Please contact us for more details.

• Gutters and U-shaped gutters
• Secondary paving products

The W-type channel features a deep groove design that can accommodate depths not available in conventional products, and it adopts a two-part method that is relatively cost-effective and easy to install. 【Features】 - The upper product is rigidly connected by beams where both ends of the upper wall serve as side ditch covers, while the lower product has a base plate that creates a robust box structure by integrating the upper and lower parts. - The two-part method allows for covering depths not achievable with conventional products, and it also facilitates easy invert construction, resulting in overall cost reduction. For other functions and details, please contact us.

• Gutters and U-shaped gutters
• Dam construction

Since the construction period can be shortened, pollution caused by construction will be significantly reduced. (The construction period is about 1/4 of that of conventional methods, which minimizes the impact on the surrounding environment.) 【Features】 ○ Improved Safety The rib structure integrates the foundation and the floor slab, greatly enhancing safety. (Materials such as anchor bolts are no longer required.) ○ Protection of Flow Cross-Section Due to the cantilever support structure, it is possible to install sidewalks along rivers and waterways without damaging the flow cross-section. ○ Semi-Permanent Structure Manufactured under strict quality control, the RC concrete requires no maintenance after installation. *For more details, please contact us.

• Dam construction
• Airport facilities

This is a concrete rigid guardrail that complies with the "Installation Standards for Guardrails" set by the Japan Road Association (Public Corporation). 【Features】 ○ Because prestressing is applied - During a vehicle collision, the blocks undergo slight deformation in an arc shape, absorbing the impact and then returning to their original shape, functioning as an elastic concrete structure. ○ Because it is a product from a JIS-certified factory - The concrete is dense and has excellent water tightness and durability. ○ It can be installed in a short period and can be used immediately - The processes of transporting blocks, installation, block joint construction, and PC tensioning can be carried out simply and quickly. ○ It can be installed even in areas with a small curve radius - Such areas are prone to accidents, making a safe guardrail necessary. In our installation records, we have installed it in a high-speed road ramp section with a radius of 50 meters. ○ We are also skilled in short section installations ○ It can be easily laid even if there is a height difference between the upper and lower lanes - In curved sections of the road, there may be a height difference in the central divider between the upper and lower lanes. By using a single slope cross-section type, it is easy to accommodate the height difference. ○ There are structures that can be temporarily installed for traffic regulation and can be permanently installed in the future as well. *For more details, please contact us.

• Protective fence
• Dam construction

○Excellent Safety The lifting of the product is performed using lifting fixtures that have a permissible load capacity of about five times the product weight, allowing for extremely safe lifting operations. Additionally, impact tests considering collisions with soundproof panels have confirmed that the panels do not break and that the scattering of fragments is extremely minimal. *For more details, please contact us.*

• Dam construction

【Features】 ○ Smooth installation work can be carried out even in narrow construction yards. ○ The loading operation (crane work) and installation work (horizontal pulling work) can be separated, allowing for rapid construction. ○ The excavation width is smaller compared to conventional methods. ○ Once the cover plates are installed, work can be conducted underground, allowing traffic above to remain open. ○ There is no need for the crane to move during installation, allowing for placement at a single lowering location. ○ Ideal for construction in densely populated residential areas, under busy roads, and for crossings under bridges and railways. ○ Installation work is possible even in areas with overhead obstacles such as elevated bridges and power lines. ○ The friction between the box culvert and the foundation is low, reducing the vertical PC tension to below 50%. ○ Construction is possible with a longitudinal slope of up to 10%. *For more details, please inquire.

• Covering plate

It is a special construction method. 【Features】 ○ There are delivery records with various railway companies. ○ In some regions, it may not be available for handling. ● For other functions and details, please contact us.

• Road construction
• Railway Construction
• Special Construction Method