Chugai Doro Co., Ltd. List of Products and Services

The "Double Finger Super Joint DF Type" is an expansion device for bridges and elevated roads featuring a horizontal (both sides) tooth structure. It has passed a fatigue test of 2 million cycles at a design load of PS200kN, equivalent to a design service life of over 40 years, demonstrating high safety and durability. With its well-established horizontal (both sides) tooth structure that ensures comfortable driving with low noise and low vibration, as well as the adoption of a secondary waterproofing structure, it contributes to the longevity of bridges through excellent overall balance. 【Features】 ■ Horizontal (both sides) tooth structure, load-supporting type, non-drainage structure ■ Durability and reliability due to the both sides tooth structure ■ Provides smooth and excellent drivability ■ Standard equipped with secondary waterproofing material "Double Waterproof Unit" ■ Reduction of noise and vibration generation due to the both sides tooth structure *For more details, please download the PDF or feel free to contact us.

The "Metal Garge Joint NLd-FLN Type" is a vertical (one-sided) expansion device for bridges and elevated roads that complies with NEXCO specifications, featuring a tooth-shaped structure. It comes in eight types of expansion ranges, starting from "NLd-20FLN" with an allowable expansion of 20 (±10) mm to "NLd-70FLN" with 70 (±35) mm, as well as "NLd-90FLN" with 90 (±45) mm and "NLd-110FLN" with 110 (±55) mm. It meets the required performance standards, including structural safety, usability, and durability. 【Features】 ■ Structural safety performance... Load-bearing verification, deformation followability, seismic resistance ■ Usability performance... Driveability, waterproofing ■ Durability performance... Resistance to repeated vehicle traffic, durability against degradation due to usage environment ■ Social and environmental compatibility performance... Noise, vibration ■ Construction performance... Workability, quality ■ Maintenance management performance... Inspectability, repairability *For more details, please download the PDF or feel free to contact us.

Our company has investigated the current state of damage to expansion joints in snowy and cold regions, focusing on the causes of damage and their characteristics, and has developed cold-region-compatible expansion joints. We have established a dust-proof layer in the device's gap section to prevent clogging by soil and debris, and installed internal steel plates beneath the dust-proof layer to resist the compressive forces of packed snow, thereby protecting the waterproof layer. In addition to the built-in temporary waterproofing material, we have standardly equipped the device with secondary waterproofing material aimed at long-term waterproofing, ensuring a structure that does not cause water leakage. 【Features】 ■ Anti-corrosion treatment... To prevent corrosion of steel materials due to freezing agents and rainwater, a high corrosion-resistant treatment of "aluminum-magnesium alloy thermal spraying" has been applied to the entire surface of the steel. ■ Protection of waterproofing material... A dust-proof layer has been established in the gap section of the expansion joint to prevent clogging by soil and debris, and internal steel plates have been installed beneath the dust-proof layer to resist the compressive forces of packed snow, thereby protecting the waterproof layer. Additionally, in conjunction with the built-in primary waterproofing material, we have standardly equipped the device with secondary waterproofing material aimed at long-term waterproofing, ensuring a structure that does not cause water leakage. ■ Snow removal measures... A snow plow guide plate compliant with the specifications of the Hokkaido Development Bureau has been installed. *For more details, please download the PDF or feel free to contact us.

The "Metal Garge Joint NLt-FLSRFD Type" is a joint designed to withstand a compressive force of 10 kN in areas with heavy snowfall. The main components are shaped steel and stud welding, based on the long-standing proven performance of the NL-FL type, which is also rated for a compressive force of 10 kN. Additionally, it allows for easy concrete pouring and ensures tight compaction, enabling a strong integration between the joint body and the floor slab. 【Features】 ■ Structural Characteristics... Vertical (one-sided) double-sided tooth structure, load-supporting type, non-drainage structure / reverse L-shaped integral structure of the supporting beam ■ Durability... The main components are shaped steel and stud welding, based on the long-standing proven performance of the NL-FL type, rated for a compressive force of 10 kN ■ Mobility... The joint tooth gap is small, ensuring good mobility ■ Water Resistance... The water stop section is filled with high-quality, highly waterproof elastic sealing material (passed water stop performance tests as per NEXCO test method 438) ■ Noise Reduction... The tooth structure reduces tire impact, and the use of soundproofing fillers effectively reduces noise *For more details, please download the PDF or feel free to contact us.