NAPP工法技術研究会 List of Products and Services

The "warm wheel for EPS" has a higher bonding strength (adhesion strength) compared to injection molding. The use of resin significantly reduces noise during operation and also contributes to weight reduction. EPS achieves high energy efficiency with a clean drive system powered by an electric motor and optimal, minimal power assistance through electronic control, compared to traditional hydraulic power steering systems. 【Features】 ■ Induction heating technology is applied in the bonding process ■ The use of resin significantly reduces noise during operation ■ Contributes to weight reduction ■ Higher bonding strength compared to injection molding *For more details, please refer to the PDF materials or feel free to contact us.

• Parts and Materials

The product is manufactured through high-frequency heat treatment, and its performance conforms to JIS G 3109 (PC steel bars) for round steel bars. It is used in many applications in the construction field, including prestressed concrete. Additionally, we offer "unbonded PC steel bars," which are coated with a special asphalt-based polymer to protect their outer surface. 【Features】 ■ Manufactured through high-frequency heat treatment ■ Performance conforms to JIS G 3109 (PC steel bars) for round steel bars ■ Used in many applications in the construction field ■ Can be processed into rolled threads without cutting the screw *For more details, please refer to the PDF document or feel free to contact us.

• Steel

"Al dente type rebar" is a steel material whose strength in the direction of the rebar cross-section is adjustable to any depth and length. It is easy to process, yet has a firm texture, high strength, and overcomes delayed fracture. It is characterized by continuous quenching and tempering through high-frequency induction heating, and the manufacturing capacity can accommodate units from kg to ton. [Features] - Significantly improved HE characteristics - Excellent workability - High strength, overcoming delayed fracture - Patent obtained *For more details, please refer to the PDF document or feel free to contact us.

• Steel

The "Captain Pile Method (CTP Method)" is a construction method that allows designers to adjust the connection state (fixity) between cast-in-place concrete piles and the foundation. Since the stress generated at the pile head during an earthquake is reduced, damage to the pile material can be minimized. The shear force from the superstructure during an earthquake is transmitted to the pile through a PC ring, and by placing tension anchoring bars, it can also accommodate the pulling force that occurs in the pile. 【Features】 ■ Improved seismic resistance ■ Rationalization of the foundation ■ Enhanced constructability and quality ■ Applicable to all building uses and structural types ■ Applicable pile types are cast-in-place concrete piles (pile diameter 800φ to 3000φ) *For more details, please refer to the PDF materials or feel free to contact us.

• Special Construction Method

"Nejibon" is a type of PC steel bar that has been subjected to high-frequency heat treatment, shaped into a screw-like profile along its entire length through hot rolling, and is specified as a deformed steel bar under JIS G 3109. Since the entire length has a screw shape, it can be cut to the required length on the construction site for use. We offer types B and C, allowing for economically advantageous design choices. Additionally, it has excellent adhesion strength with concrete. 【Features】 ■ Entire length has a screw shape ■ Can be cut to the required length on the construction site ■ Available in types B and C ■ Superior adhesion strength with concrete ■ Epoxy resin coating for this product is also available upon request *For more details, please refer to the PDF document or feel free to contact us.

• others

"ITW" is a high-quality spring steel wire that utilizes high-frequency induction heating technology. Due to rapid and short-time austenitization through high-frequency induction heating, fine crystal grains are obtained, and surface decarburization or oxidation of grain boundaries hardly occurs. Additionally, the synergistic effect of fine quenching structures and high-frequency short-time tempering allows for the simultaneous achievement of high strength and high toughness. [Features] - Minimal surface decarburization and oxidation of grain boundaries - Simultaneous attainment of high strength and high toughness - Adjustable to any desired strength according to customer requirements - Uniform strength is achieved throughout the entire length of the product - Variation in strength between product coils is kept to a very small level *For more details, please refer to the PDF document or feel free to contact us.

• others

"Urubon" is a fine diameter deformed PC steel bar that complies with JIS G 3137 (fine diameter deformed PC steel bars) Type D No. 1, featuring excellent mechanical properties and ease of use. Under appropriate working conditions, using a spot welding automatic assembly machine for rebar cage formation does not significantly reduce mechanical properties. Additionally, the surface of the steel bar is shaped with spiral grooves along its entire length, providing excellent adhesion to concrete. [Features] ■ Complies with JIS G 3137 (fine diameter deformed PC steel bars) Type D No. 1 ■ Coil material unwinds into a straight line, eliminating the need for straightening work ■ Very little relaxation, remaining stable even over long periods ■ Excellent adhesion to concrete ■ Uniform cross-sectional shape along the entire length, allowing for direct rolling screw processing *For more details, please refer to the PDF document or feel free to contact us.

• others

We would like to introduce "High-Frequency Hardening of Sintered Alloy Parts," which can accommodate a variety of product shapes. High-frequency hardening utilizes induction heating technology to heat only the necessary parts for hardening in a short time, allowing for the hardening process to be carried out. Compared to furnace heating treatment, it results in less deformation and almost no surface decarburization. High-frequency hardening greatly contributes to near-net-shape manufacturing. 【Features】 ■ Abundant technology, experience, and track record ■ Accommodates a variety of product shapes ■ Rapid response for mass production ■ Contributes to near-net-shape manufacturing ■ Flexible response from the prototype stage *For more details, please refer to the PDF materials or feel free to contact us.

• Other services and technologies

We would like to introduce our "high-frequency hardening of rotating wheels," which can accommodate everything from single orders to mass production. Due to the short-time partial heating treatment characteristic of the high-frequency hardening method, which utilizes self-heating, the amount of distortion is minimized compared to conventional furnace-heated products, allowing for a reduction in labor and costs in subsequent processes. Based on our extensive experience, we design coils to quickly create hardening patterns that meet your specific needs. 【Features】 ■ Heating patterns suited to product shapes ■ Cost reduction due to low distortion ■ Capable of handling everything from single orders to mass production ■ Reliable quality ■ Quality assurance through automatic distortion removal machines *For more details, please refer to the PDF document or feel free to contact us.

• Other services and technologies

Our company offers the PC method "NAPP method" using hollow PC steel bars. In construction sites, prestressing force can be introduced without using reaction abutments or large jacks. Therefore, installation in narrow spaces is also easy. Additionally, since the NAPP units are prestressed in a strictly controlled factory, tension management on site is unnecessary. 【Features】 ■ As it uses a pre-tensioning method, there is no need for sheath placement or grouting work. ■ There is no set loss, allowing for reliable introduction of prestressing force even into short concrete members. ■ The NAPP unit has a small anchorage section and a reduced notch size, making it easy to integrate with rebar and other elements. ■ The NAPP anchor method enables bonding with existing concrete and reduces the burden on existing structures. *For more details, please download the PDF or feel free to contact us.

• Special Construction Method
• Bridge Construction