極東興和 List of Products and Services

The "Rehabilitation Capsule Method" is a repair method that can fundamentally suppress salt damage and neutralization. By pressurizing and injecting lithium nitrite, which is a permeable diffusion type, around the rebar in concrete, it is possible to regenerate the passive film on the rebar and fundamentally suppress further rebar corrosion. It is also effective for structures that cannot tolerate re-deterioration due to inherent salt or airborne salt. 【Features】 ■ Can reliably supply lithium nitrite to the rebar position in a short period ■ The effect of regenerating the passive film is immediately exhibited, allowing for the suppression of further rebar corrosion ■ The required amount of lithium nitrite can be quantitatively determined according to the amount of chloride ions *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods

The "ELSS Joint" is a completely new floor slab jointing method that solves the challenges of loop joints without compromising safety, durability, drivability, or cost-effectiveness, by joining with only softer filling materials than the concrete of the floor slab itself. By utilizing the unique structural characteristics of the floor slab, which is continuously supported in the direction of vehicle travel by steel girders and earthquake-resistant wall parapets, this method features the incorporation of low-stiffness filling joints at intervals along the direction of vehicle travel, transforming the floor slab structure into an anisotropic slab with differing stiffness in the direction of vehicle travel and width. **Features** - Joins using only filling materials that are softer than the concrete of the floor slab itself. - Solves the challenges of loop joints without compromising safety, durability, drivability, or cost-effectiveness. - Transforms the floor slab structure into an anisotropic slab with differing stiffness in the direction of vehicle travel and width. - Reduces the bending moment in the direction of vehicle travel, which has lower stiffness. - Significantly simplifies the joint structure. *For more details, please refer to the PDF materials or feel free to contact us.*

• Special Construction Method

The "K-PREX Method" is a technology that introduces prestress into existing structures by expanding the diameter of drilled holes within the existing concrete and using fixed PC steel materials. This method aims to reinforce the interior of existing structures or integrate new and old components. By introducing prestress at the joint surfaces, water tightness is significantly improved. Since it can also be applied to existing structures, it allows for economical reinforcement of components in soil and underwater. Additionally, it can reduce the number of chemical anchors required. 【Features】 ■ Expanding the diameter of drilled holes within existing concrete ■ Introducing prestress using fixed PC steel materials ■ Reinforcing the interior of existing structures or integrating new and old components ■ Significantly improving water tightness by introducing it at joint surfaces ■ Reducing the number of chemical anchors required *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods
• Concrete construction

By pressurizing and injecting lithium nitrite into the entire concrete member, it is possible to non-expand the alkali-silica gel, which is the cause of ASR, fundamentally suppressing further deterioration. This method is also effective for structures that cannot tolerate re-deterioration due to moisture supply. 【Construction Procedure】 1. Seal the surface of the member with polymer cement mortar. 2. Drill holes of φ20mm at intervals of 750mm in the concrete structure. 3. Inject lithium nitrite into the entire member using a pressurization device (injection duration: approximately 20 to 30 days). 4. Fill all injection holes with non-shrink grout material. *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods
• Ground foundation construction method

The cantilever construction method involves extending without any supporting scaffolding from the ground, generally balancing from the bridge piers to the left and right, using a moving work vehicle or a movable erection girder. It sequentially extends towards the center of the span while casting concrete in blocks of appropriate length. 【Features】 ○ It enables the construction of long-span PC bridges, and since its technical introduction to our country in 1958, there have been numerous construction achievements, extending the length of the long spans. ● For other functions and details, please download the catalog.

• Foundation construction

This is a construction method where PC girders that have been transported are lifted and installed using a self-propelled crane truck positioned at the back of the bridge abutment or under the girder at the installation site. 【Features】 ○ The types of cranes used have a lifting capacity in the range of 1,964,900 kN, and hydraulic truck cranes, mechanical truck cranes, and crawler cranes are selected according to their respective conditions. ○ The installation methods include single lifting installation using one crane and simultaneous lifting installation using two cranes. ○ It is a labor-saving method characterized by its fast installation speed. ● For other functions and details, please download the catalog.

• Foundation construction
• Crane and others

The "alkali-silica reaction" that deteriorates concrete structures, which were said to be maintenance-free, and even reduces their strength. Initially, it was believed that the damage was limited to surface cracking of the concrete, but recent investigations have pointed out the possibility of internal concrete deterioration and rebar fracture, making the issue more serious. 【Features】 ○ By pressurizing and injecting an ASR suppressor primarily composed of lithium nitrite, it effectively penetrates and diffuses through the fine cracks in the internal concrete of the structure, reducing future expansion of the internal concrete and suppressing further deterioration due to ASR. ● For other functions and details, please download the catalog.

• Reinforcement and repair materials
• Renovation and repair methods

This is a pile foundation method developed to respond to harsh construction environments, such as under bridge girders or in close proximity to existing structures, as a seismic reinforcement method for existing foundations. By using small construction machinery and small-diameter steel pipes, it enables construction in confined spaces while minimizing the impact on the surrounding area. 【Features】 ○ The optimal micro-pile method can be selected according to the installation conditions, load conditions, construction conditions, and ground conditions of the structure. ○ By incorporating drilling techniques and pressurized grouting techniques used in ground anchor methods into micro-pile technology, and additionally using steel pipes along with deformed reinforcing bars as reinforcement materials, it forms piles with high strength and high load-bearing capacity. ● For other functions and details, please download the catalog.

• Renovation and repair methods
• Ground foundation construction method