丸栄コンクリート工業 List of Products and Services

Our box culverts are widely used in public works such as urban drainage systems, agricultural drainage ditches, underground pedestrian passages, and road crossing culverts, as well as in large-scale residential developments and factory site construction. 【Features】 ○ The box culverts include Type III, national box culvert association standard types (RC, PC), DCJ box culverts, two-part types, long-span culverts, and free-angle types. ● For other functions and details, please contact us.

The roadside ditches are installed along urban and rural roads, transforming them into wide roads that can accommodate vehicle traffic. There are two types of culverts, a two-part type consisting of a main body and a slab, with load capacities of 137 kN and 196 kN. 【Features】 ○ Being a two-part type allows for flexible configuration of open and closed channels. ○ Maintenance and management within the waterway are easy. ○ It is also possible to change an open channel to a closed channel later on. ● For other functions and details, please contact us.

The DCJ box culvert can achieve high seismic and water-tight performance simply by inserting the "inlet" equipped with a two-layer structure special rubber ring into the "outlet." Additionally, it excels in workability as the internal joint work can be omitted. The special rubber ring features a two-layer structure, with a soft rubber base covered by hard rubber on the outside, which provides excellent followability, compression recovery, and abrasion resistance, maintaining high water-tight performance (0.06MPa) even during extraction due to seismic motion or after bending. For more details, please contact us or refer to the catalog.

There are III type, national box culvert association standard type (RC, PC), DCJ box culverts, two-part type, long-span culverts, and free-angle type box culverts.

The "DCJ Box Culvert" is a box culvert that ensures high seismic and watertight performance simply by inserting the inlet with a special rubber ring featuring a two-layer structure into the outlet. It allows for the omission of internal joints, resulting in excellent workability. Additionally, by absorbing ground displacement at each joint of the product, it reduces the stress generated in the structure and minimizes the amount of pull-out and bending angles at each joint. 【Features】 - Available in two types: K-type and T-type, allowing for differentiation based on application. - The special rubber ring excels in followability, compression recovery, and wear resistance, maintaining high watertight performance (0.06 MPa) even during pull-out due to seismic motion or after bending. - Certified product by the Japan Precast Concrete Products Technology Association. *For more details, please download the PDF or feel free to contact us.

In this catalog, we introduce various products handled by our company. In 1925, Tanahashi Shoten was established in Hashima City, Gifu Prefecture, as a manufacturer and contractor of cement tiles. For nearly a century since our founding, we have been pioneering new fields, primarily focusing on "U-shaped prefabricated waterways" through the creation of various products. Without forgetting our origins, we will continue to take new strides toward the next stage. 【Contents (partial)】 ■ Box culverts / Large box culverts ■ Retaining walls ■ Storage ■ Waterways ■ Ditches *For more details, please refer to the PDF document or feel free to contact us.

This catalog introduces "Box Culverts and Large Box Culverts." It features various products, including the "MC Hole," a manhole used for the maintenance and management of box culverts buried underground, and the "Arch Culvert," which ensures high watertightness by using rubber rings at the joints. Please make use of this for selecting products. [Featured Products (Partial)] ■ RPCA - National Box Culvert Association Type ■ MC Hole ■ RPCA-DCJ Box Culvert ■ Arch Culvert ■ C.C. BOX Joint Utility Trench *For more details, please refer to the PDF document or feel free to contact us.

Maruei Concrete Industry handles the "RPCA-Box Culvert." It is a product that meets the standards set by the Japan Precast Concrete Products Association and is our original standard product. We offer a variety of sizes in our lineup. Please feel free to contact us when you need assistance. 【Design Conditions】 ■ Live Load: T-245 ■ Unit Weight of Soil: W = 18 kN/m3 ■ Soil Pressure Coefficient: K = 0.5 ■ Standard Soil Cover: 0.2 to 3.0 m *For more details, please refer to the PDF document or feel free to contact us.

We handle the "RPCA - National Box Culvert Association Type." It complies with the Road Earthwork Culvert Construction Guidelines of the Japan Road Association and is certified as Class I materials by the Japan Sewage Works Association. The "RC type" is available as a Class I certified product under JIS A 5372, while the "PC type" is available as a Class I certified product under JIS A 5373. 【Features】 ■ Standard products of the National Box Culvert Association ■ Class I certified materials by the Japan Sewage Works Association ■ Compliant with the Road Earthwork Culvert Construction Guidelines of the Japan Road Association ■ Products that meet the evaluation standards of the Japan Precast Concrete Products Technology Association *For more details, please refer to the PDF document or feel free to contact us.

The "MC Hole" is a modular rectangular manhole used for the maintenance and management of box culverts buried underground. The opening size of the installation pipe block can be adjusted to match the size of the installation pipe. The internal dimensions are standardized in ten sizes ranging from 1200×1200 to 3500×1500. Since it is made of precast products, it can shorten construction time compared to on-site casting, and it can also withstand seismic motions at seismic design level 2. 【Features】 ■ Manhole used for the maintenance and management of box culverts buried underground ■ Shortens construction time compared to on-site casting due to the use of stacked precast products ■ Internal dimensions standardized in ten sizes from 1200×1200 to 3500×1500 ■ Opening size of the installation pipe block can be adjusted to match the size of the installation pipe ■ Seismic joints are possible at the joints ■ Can withstand seismic motions at seismic design level 2 *For more details, please refer to the PDF document or feel free to contact us.

The "RPCA-DCJ Box Culvert" is a product that ensures high seismic and water-tight performance simply by inserting the inlet into the outlet, equipped with a special rubber ring with a two-layer structure. There are two types, K-type and T-type, which can be used according to the application. The "K-type Flexible Joint Box Culvert" has flexibility in each product, ensuring sufficient water-tight performance, while the "T-type Seismic Joint Box Culvert" has seismic performance that can withstand level 2 earthquake motions. 【Features】 ■ The special rubber ring has a two-layer structure with a soft rubber base material covered by hard rubber on the outside. ■ High water-tight performance can be secured simply by inserting the inlet into the outlet. ■ Internal joint work can be omitted, providing excellent workability. ■ Certified product by the Japan Precast Concrete Products Technology Association. *For more details, please refer to the PDF document or feel free to contact us.

Our company handles the "Arch Culvert" for high embankments. By using rubber rings at the joints, high water-tightness can be ensured. It also demonstrates flexibility against slight uneven settlement of the ground, eliminating concerns about leakage. Additionally, since the upper part has an arch shape and the lower part has a box shape, the load on the upper part is transmitted as axial compressive force, reducing the bending moments that occur in the upper part and side walls of the members, resulting in high strength. 【Types by Shape】 ■ A Standard: Standard Arch Culvert ■ P Standard: Longitudinally Connected Arch Culvert ■ S Standard: Two-Part Arch Culvert *For more details, please refer to the PDF document or feel free to contact us.

The underground wiring plan, which secures a comfortable walking space and improves urban scenery, began with the "Phase 1 Underground Wiring Plan" using the cab system from fiscal year 1986. Then, starting in 1995, the "Phase 3 Underground Wiring Plan" transitioned from the cab system to the more compact and flexible structure known as 'C.C. BOX (joint utility trench).' Due to its significant role as a public facility, it reduces the burden on power and telecommunications operators and facilitates their entry into the joint utility trench. 【Features】 ■ Smaller and more flexible compared to the conventional cab system ■ The compact utility housing facility is embedded at a shallow depth from the surface, making construction easy ■ New cables can be added from the branching point without the need to excavate the road each time ■ Its significant role as a public facility reduces the burden on power and telecommunications operators, making entry into the joint utility trench easier *For more details, please refer to the PDF document or feel free to contact us.

We handle "two-part box culverts." The standard internal width is approximately 3.5 to 8.0 meters, and considering transportability and constructability, it is designed in a two-part shape, assembled using mortar-filled joints. Please feel free to contact us when you need assistance. 【Features】 ■ Two-part shape considering transportability and constructability ■ Assembled using mortar-filled joints ■ Standard internal width of approximately 3.5 to 8.0 meters *For more details, please refer to the PDF document or feel free to contact us.

We handle "4-part large box culverts." The components are connected using mortar-filled joints and are divided into four parts for transportability and constructability, making it a fully precast box culvert. Please feel free to contact us when you need assistance. 【Features】 ■ Fully precast and segmented ■ Four-part shape considered for transportability and constructability ■ Components connected using mortar-filled joints *For more details, please refer to the PDF materials or feel free to contact us.

Our company handles "Long Span Culverts." The construction is extremely simple; the top slab components are placed on the side wall components and connected by PC steel bars. By adopting cast-in-place for the bottom slab, it offers excellent cost-effectiveness. The structural form uses PRC, and it consists of a segmented box culvert made up of top slab components, side wall components, and cast-in-place bottom slab. 【Features】 ■ Uses PRC as the structural form ■ Segmented box culvert made up of top slab components, side wall components, and cast-in-place bottom slab ■ Extremely simple construction; top slab components are placed on side wall components and connected by PC steel bars ■ Excellent cost-effectiveness by adopting cast-in-place for the bottom slab *For more details, please refer to the PDF materials or feel free to contact us.

Our company handles "Free Angle Box Culverts." These are sloped box culverts that can be constructed to accommodate roads and waterways intersecting at various angles, allowing for shortened construction periods and improved cost-effectiveness. Compared to conventional methods, the product has no protrusions, resulting in a neat shape. Additionally, the waterway width can be manufactured from 4.0 to 8.0 meters. 【Features】 ■ Can be constructed to accommodate roads and waterways intersecting at various angles ■ Allows for shortened construction periods and improved cost-effectiveness ■ Can be manufactured at various angles to suit each construction site ■ Designed to eliminate exposed concrete sections at the site ■ Waterway width can be manufactured from 4.0 to 8.0 meters *For more details, please refer to the PDF document or feel free to contact us.

"Texpan" is a two-part precast arch culvert method developed in France. Due to its unique arch shape, it can accommodate a soil cover of 30 meters even with a thin member thickness of 40 cm. It enables large spans of 20 meters, thereby realizing various internal cross-sections. By alternately combining reinforced concrete arch members, it creates space, and by placing fill on top, it can serve as an alternative to culverts and bridges. 【Features】 ■ Two-part precast arch culvert method developed in France ■ Members are installed in pairs, requiring no special technology or skilled labor ■ The aesthetic beauty of the arch curve harmonizes with the surrounding environment ■ Its unique arch shape allows for a soil cover of 30 meters even with a thin member thickness of 40 cm ■ Enables large spans of 20 meters and realizes various internal cross-sections *For more details, please refer to the PDF document or feel free to contact us.