コクカコーポレーション List of Products and Services

"Kokuka-style sports carving" is a type of curb for athletic fields that can be selected according to your needs from two types: straight and curved, and five specifications: fixed, detachable, retractable, inverted, and sliding. We offer a wide range of products, including those made of SUS304, which are top-class in precision and durability, as well as those with an aluminum body and SUS304 legs. 【Lineup】 ■ Sports Carving S-I Type (Detachable) ■ Sports Carving S-I Type (Fixed) ■ Sports Carving S-I Type (Retractable) ■ Sports Carving S-I Type (Inverted) ■ Sports Carving S-I Type (Sliding) *For more details, please download the PDF or feel free to contact us.

• Sports related facilities
• stone

The "barrier-free permeable circular drainage ditch" is a drainage ditch with a 2% slope designed for barrier-free accessibility. Due to its one-piece molding, it achieves excellent workability. Additionally, the circular shape of the drainage creates a spiral flow of water, which helps suppress sediment accumulation and demonstrates high drainage capacity. 【Features】 ■ (Slit type) Provides sound insulation effect ■ Compatible with permeable pavement *For more details, please download the PDF or feel free to contact us.

• Gutters and U-shaped gutters
• Rainwater infiltration facilities

The "New Pola Hall PROTECT Method" is a liquefaction countermeasure technique that protects sewage and stormwater manholes with permeable manholes and backfills them with crushed stone. Our permeable concrete has a permeability coefficient of K=1.0 cm/sec or higher, allowing for the instantaneous collection of pore water pressure caused by liquefaction through the permeable manholes and its dispersion through crushed stone. 【Features】 ■ Effective for "rainwater infiltration" and "pressure infiltration" ■ Maintains permeability and breathability ■ Can be utilized as existing drainage ditches ■ Prevents uplift without damaging the manholes *For more details, please download the PDF or feel free to contact us.

• Special Construction Method
• Ground foundation construction method
• Rainwater infiltration facilities

The "Sports Bench SB-I/II Type" is a concrete product for sports facilities that can reuse existing facilities, offering high convenience, excellent constructability, and cost-effectiveness. It is not only suitable for various sports facilities but also convenient for use in parks, schools, and multi-purpose facilities. 【Features】 ■ Can be installed in outdoor sports areas, allowing for comfortable viewing ■ Uniform finish due to mold production ■ Sufficient strength maintained ■ Excellent aesthetic appeal *For more details, please download the PDF or feel free to contact us.

• Tables and benches (chairs)
• Sports related facilities
• Outdoor stairs

The "Sports U-shaped Drainage Channel Elevation (for Artificial Turf)" is a drainage solution designed for artificial turf that addresses various issues such as functionality, construction, and cost-effectiveness, allowing for safe usage. It can be adapted to various sizes, whether for soccer fields, tennis courts, or baseball fields. It can be elevated and reused without renovating existing drainage channels. 【Features】 ■ Reuse of existing drainage channels ■ Zero leftover soil, environmentally friendly ■ Elevation material is simply placed and installed ■ Using the elevation (infiltration type) allows for surface drainage collection *For more details, please download the PDF or feel free to contact us.

• Drainage and ventilation equipment
• Gutters and U-shaped gutters
• Rainwater infiltration facilities

The "L-shaped permeable two-chamber drainage basin" is a rainwater basin equipped with permeation functionality. It temporarily holds rainwater on one side and processes the excess rainwater in a different direction, adopting a storage method to prevent actual rainwater damage. It addresses various issues such as increased rainwater runoff into the sewer system, flooding damage caused by frequent heavy rain (guerrilla rain), and significant flooding in underground shopping areas and subways. 【Features】 ■ Twice the storage capacity ■ Easy installation ■ Enhanced functionality *For more details, please download the PDF or feel free to contact us.

• Gutters and U-shaped gutters
• Rainwater infiltration facilities

This catalog features "permeable concrete products for roads" handled by Kokka Corporation, which mainly engages in the manufacturing and sales of permeable concrete products. It includes a wide range of products, such as the "Permeable Drain NKSU/NVS," which has a cover that can be installed for a drainage size of 300 using a cover size of 250, and the "Permeable Circular Drain (Urban Type)" with an average permeability coefficient of over 0.5 cm/sec for smooth drainage. [Featured Products] ■ Permeable Drain NKSU/NVS ■ Permeable Circular Drain ■ Barrier-Free Permeable Circular Drain Grating/Slit ■ Circular Drain ■ Rainwater Permeable Pit JKC Heavy-Duty Angle Pit, etc. *For more details, please download the PDF or feel free to contact us.

• Rainwater infiltration facilities
• Gutters and U-shaped gutters

This catalog features "comprehensive equipment permeable concrete products" handled by Kokka Corporation, which mainly engages in the manufacturing and sales of permeable concrete products. It includes products such as the "Permeable Corner Basin JKC (integrated with edge blocks)," which eliminates the need for cutting U-shaped gutters and allows for smooth installation, as well as the "Permeable Corner Basin KM (T-14 compatible product)," which can permeate rainwater from road surface drainage, ditches, and underground channels. 【Featured Products】 ■ Permeable Corner Basin JKC (integrated with edge blocks) ■ Permeable Corner Basin KM (T-14 compatible product) ■ Permeable Joint Corner Basin JKM (T-14 compatible product) ■ L-shaped Permeable Double Basin ■ Permeable Trench KT1-200/KT2-200, etc. *For more details, please download the PDF or feel free to contact us.

• Piping materials (concrete pipes)
• Rainwater infiltration facilities

This catalog features "circular drainage channels" handled by Kokka Corporation, which mainly engages in the manufacturing and sales of permeable concrete products. We offer a wide variety of products, including the "circular drainage channel floor type," which can be used in conjunction with accessories (angles) for interlocking, and the "circular drainage channel dual slope type," which is suitable for collecting water from both sides and is ideal for building exteriors and parking lots. [Featured Products] ■ Circular Drainage Channel Floor Type ■ Circular Drainage Channel Dual Slope Type ■ Circular Drainage Channel Mound Type ■ Circular Drainage Channel Cross Type *For more details, please download the PDF or feel free to contact us.

• Gutters and U-shaped gutters

This catalog introduces specialized concrete products for sports facilities handled by Kokka Corporation. It features a wide range of products, including the "Sports Circular Drain (SK Drain)" which allows for rapid rainwater management, the "Sports U-shaped Drain SU-I Type" which provides sufficient flow rate and volume, and the compact "New Sports U-shaped Drain NSU." [Contents (Excerpt)] ■ Overview ■ Sports Drain ■ Sports Circular Drain (SK Drain) ■ Sports U-shaped Drain ■ New Sports U-shaped Drain/NSU *For more details, please refer to the PDF document or feel free to contact us.

• Gutters and U-shaped gutters

We would like to introduce the "Rainwater Infiltration Basin" handled by Kokka Corporation. The area around the basin is backfilled with crushed stone, allowing the collected rainwater to infiltrate into the relatively shallow parts of the ground from its bottom and sides. We offer a wide range of products, including the "JKC," which prioritizes safety by reducing the size of the grating, the maintenance-friendly "KM," and the compact "TRX," which has an internal diameter of 400. 【Product Lineup (Excerpt)】 ■ Integrated Edge Block Type "JKC" ■ KM ■ PRX ■ Infiltration Heavy-Duty Angle Basin ■ Trex Basin "TRX" *For more details, please refer to the PDF document or feel free to contact us.

• Drainage and ventilation equipment
• Fittings

"NFP" is a permeable pipe that is very easy to install using in-line joints. By attaching a steel filter to the pipe opening to prevent clogging, maintenance such as debris removal is possible. It is suitable for rainwater drainage treatment around buildings, parking lot exteriors, and for rainwater management in sports facilities such as grounds, parks, and schools. 【Features】 ■ Very easy to install with in-line joints ■ Exhibits two functions: permeation and water collection ■ Smooth permeation capability of 0.5 cm/sec or more ■ Safety considerations for uneven settlement during installation ■ Short pipe length makes it easy to handle *For more details, please refer to the PDF materials or feel free to contact us.

• others

The "F Series" is a permeable box that allows for both large storage capacity and infiltration simultaneously. By securing a greater amount of rainwater storage, safe rainwater drainage treatment in the soil has become possible. It is particularly effective in areas with high groundwater levels. Sizes available are 300, 500, 700, 1000, and 1500. 【Features】 ■ Simultaneous large storage capacity and infiltration ■ Ability to secure more rainwater storage ■ Safe rainwater drainage treatment in the soil ■ Particularly effective in areas with high groundwater levels ■ Sizes available: 300, 500, 700, 1000, and 1500 *For more details, please refer to the PDF document or feel free to contact us.

• others

The "permeable gutter" is a concrete gutter with permeable functionality. It uses permeable concrete made with a special formulation technique, allowing collected rainwater to permeate from the sides and bottom. We offer a wide range of products, including "NKSU," which fulfills permeation and storage functions, "NKU," which can also be used as a cross gutter, and "KSU," which can be used in conjunction with retention basins to reduce their size. 【Features】 ■ Made with permeable concrete using a special formulation technique ■ Collected rainwater permeates from the sides and bottom ■ A wide range of products available *For more details, please refer to the PDF document or feel free to contact us.

• Gutters and U-shaped gutters

The "Permeable Circular Drain" utilizes the technology of precasting circular drains and incorporates the function of permeability, leading to its development. It excels in aesthetic appeal and has been adopted by many government agencies, architectural firms, and surveying offices. We offer a wide range of products, including the urban-oriented circular drain "Floor Type," the "Mound Type" suitable for road drainage permeability, and the "Grating Type S-I" with a 2% slope that accommodates barrier-free design. 【Features】 - Utilizes the technology of precasting circular drains while adding the function of permeability. - Made with high-quality aggregates from the Kinugawa River. - Exhibits excellent permeability with an average permeability coefficient of over 0.5 cm/sec. - Capable of returning rainwater to underground soil, contributing to groundwater replenishment. - The structure complies with T-25 standards, making it suitable for use as a roadside drain. *For more details, please refer to the PDF document or feel free to contact us.

• Gutters and U-shaped gutters

The "D-product" does not require a single-sized crushed stone layer because the permeable concrete part functions as a permeable layer. In addition to permeability, it also has a water retention function due to the permeable concrete. Furthermore, by installing a steel filter to prevent clogging at the pipe opening, maintenance such as debris removal is possible. 【Features】 ■ No single-sized crushed stone layer is needed as the permeable concrete part functions as a permeable layer. ■ It allows rainwater to directly permeate into the soil, eliminating the need for a permeable sheet. ■ Easy to install and has a narrow excavation width, making it cost-effective. ■ In addition to permeability, it also has a water retention function due to the permeable concrete. ■ When combined with a permeable well, it enables safer drainage treatment. *For more details, please refer to the PDF document or feel free to contact us.

• Drainage material
• Drainage and ventilation equipment

The "New Pola Hall" is a monolithic assembly-type manhole manufactured by Kokka Corporation, a comprehensive manufacturer of secondary products made from permeable concrete. Since it is made of permeable concrete, it disperses the water pressure from liquefaction and allows pressure to permeate. Additionally, we offer a wide range of sizes from Φ900 to Φ1200, so please feel free to contact us if you have any requests. 【Features】 ■ Monolithic manhole for lightweight and easy installation ■ In-row type for slip prevention ■ Maintenance-friendly with safety steps for management ■ Aesthetically pleasing design ■ Reduced weight leads to lower construction costs *For more details, please download the PDF or contact us.

• Manhole body