家島建設 List of Products and Services

The "Yoshiyu" is a large grab dredger equipped with a 25m³ large grab bucket, an 8m³ hard soil grab bucket, and a 50T rock crushing weight, incorporating a GPS construction management system. It is equipped with three spuds for mooring, allowing for quick forward and backward movement of the hull through the ±15° tilt kick force of the stern spud. 【Features】 ■ Equipped with RTK-GPS (GS-10) BPS-20II ■ Operations in narrow waterways, shipping routes, and berths are conducted with spud mooring without anchoring, making it very safe for nearby navigating vessels and allowing for rapid evasive actions. ■ The spuds provide not only their own weight but also a downward force (0-100T), ensuring the hull remains stable and automatically follows changes in wave and tide levels. *For more details, please download the PDF or feel free to contact us.

• Work boats, research vessels, underwater work machines

The "Shinyo" is a rotary crane vessel equipped with advanced technology, serving as both a crane ship and a grab dredger (for rock crushing as well). This vessel is equipped with a 350t lifting capacity as a rotary crane ship, and for grab dredging, it has a large grab bucket of 25m³, a hard soil grab bucket of 8m³, and a 50t heavy weight for rock crushing, along with a GPS construction management system. As mooring equipment, it is equipped with three spuds, allowing for quick forward and backward movement of the hull through the 15° inclined kick force of the stern spud. 【Features】 ■ Equipped with RTK-GPS (GS-10) BPS-20II ■ Operations in narrow waterways, navigation routes, and anchorage areas are conducted with spud mooring without the need for anchoring, making it very safe for nearby vessels and allowing for quick evasive actions. ■ The spuds provide not only their own weight but also a downward force (0-100t), ensuring the hull remains stable and automatically follows changes in waves and tide levels. *For more details, please download the PDF or feel free to contact us.

• Work boats, research vessels, underwater work machines

The "HARIMANIAN Seiryu" is a hybrid grab dredger that employs a "double hybrid" system, which charges batteries with surplus power from the generator on the barge and stores regenerative power generated during the lowering of the crane's grab bucket. The crane on this vessel is equipped with advanced systems from FURUNO, a world-renowned brand in construction management systems. 【Features】 ■ W Hybrid System ■ Advanced Construction Management System ■ Thorough consideration for safety and work efficiency *For more details, please download the PDF or feel free to contact us.

• Work boats, research vessels, underwater work machines

The "Kōyō 12000" is a work barge for caisson production, boasting a manufacturing capacity of 12,000 tons. As one of the largest floating docks in the country, it achieves excellent watertightness and strength, demonstrating its capabilities particularly in the production of large caissons, which are in high demand, as well as in large-scale projects. Additionally, the pontoon deck is robust, with a thickness of 14mm and a pressure resistance of 18t/m², and advanced shipbuilding technology is utilized throughout the hull structure. 【Features】 - The required time for water intake and drainage is approximately 2.5 hours. - Thanks to computer-controlled ballast tank water intake, even massive caissons can be launched in an extremely short time. - Equipped with two jib cranes with a reach of 40m and a rated load of 6.0t on the upper deck's port side, allowing for efficient caisson production. - The depth of the upper deck is 28.3m, enabling high launching. - It can secure a maximum sinking draft (planned) of 26.8m, among other features. *For more details, please download the PDF or feel free to contact us.*

• Work boats, research vessels, underwater work machines

The "Hamanasu No. 3" is a work barge designed for caisson production, boasting a manufacturing capacity of 7,000 tons. As a floating dock, it is capable of producing small to medium-sized caissons as well as large caissons, with a very short time of just 2 hours required for both filling and draining during caisson launching. Additionally, a passageway is provided in the center of the hull, allowing access on both sides even during sinking. 【Features】 - The filling and draining during caisson launching can be operated fully automatically by a computer. - Two jib cranes are installed on one side as cargo handling machinery to enhance work efficiency. - The thickness of the pontoon deck steel plate is 14mm, providing a robust pressure resistance of 13t/m². - Internal telephones are installed in four key locations, including the control room, to simplify communication. - The height is set at 19.50m for high launching, with a maximum sinking draft of 18.00m. *For more details, please download the PDF or feel free to contact us.*

• Work boats, research vessels, underwater work machines

The "Tsukushi 7000" is a work barge for caisson production with a cargo capacity of 7,000 tons. It is equipped with advanced facilities and innovations throughout, allowing for the efficient and safe production of large caissons. Additionally, the inflow and outflow of water during caisson launching can be operated fully automatically by a computer. 【Features】 - The required time for inflow and outflow during caisson launching is set to 2.5 hours each, enabling quick launching. - Two jib cranes are installed on one side as loading and unloading machinery to improve work efficiency. - The thickness of the pontoon deck steel plate is 14mm, with a pressure resistance of 20t/m². - A passageway is provided in the central part of the hull, allowing access on both sides even during sinking. - The height is set at 25.00m for high launching, with a maximum sinking draft of 23.50m. *For more details, please download the PDF or feel free to contact us.

• Work boats, research vessels, underwater work machines

At Iejima Construction Co., Ltd., we handle various methods for ground improvement work. We possess technologies such as the "Static Compaction Pile (SDP) Method" aimed at liquefaction countermeasures and arc sliding countermeasures, as well as the "Sand Compaction Pile Method" and the "Sand Drain Method," which shortens drainage distance. For any inquiries regarding ground improvement work, please feel free to consult with us. *For more details, please download the PDF or feel free to contact us.

• Ground foundation construction method
• Ground improvement