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Technology Technology Top Civil Engineering Technology 3D Gallery Technological Research Institute Works Works Top Bridges Precast Concrete Architecture About Us About Us Top Corporate Information Top Corporate Information Greeting Our Principles Officers Corporate Outline Business Introduction Network History Affiliated Companies Investor Relations Top Investor Relations Balance sheet And Statement Investor Relations 日本語 Inquiry TOP Technology Civil Engineering Technology Maintenance Technology Maintenance Technology Electric Protection with Linear Anodes (PI-Slit Protection Method) Re-injecting of Lithium-Nitrite-Containing Solution and Grout (Re-Passive) Method Technical Documents Regarding to Maintenance Deck slab replacement (JAPANESE)[PDF:923KB] It is a construction method which replaces the concrete deck slab of a steel bridge which suffers degradation and lacks load bearing ability with precast concrete deck slab. MuSSL Method[PDF:1.12MB] MuSSL method is a joint construction method, which can be applied in chin-shaped precast slab with constructability and durability regardless of its thickness. Half-section Slab Replacement Method (JAPANESE)[PDF:1.05MB] The half-section slab replacement method is a construction method enable to replace slab with enforcing only one lane regulation. As a result, social loss caused by traffic congestion can be minimized. Full-Cast Concrete Barrier (JAPANESE)[PDF:1.56MB] Full-cast concrete barrier are constructed in advance of the precast prestressed concrete slab and erected, thus reducing the need for concrete barrier construction at the site to an absolute minimum. CFCC Concrete Railing (Precast Concrete Bridge Railing) (JAPANESE)[PDF:1.82MB] CFCC concrete railing is a railing structure in which carbon fibre cable (CFCC) bears the bending moment generated by the design load; concrete sectional keys in horizontal and vertical concrete bear the shear force. By using non-corrosive CFCC at joints between the railing and the wheel guard, and construction completion only by filling mortar after assembling, both high durability and labour saving can be achieved. Prestressed Concrete Confined Jacketing -Underwater Construction Method[PDF:815KB] It is a seismic retrofit method of bridge piers which applies PC confined method to a underwater RC bridge pier.Temporary cofferdam or temporary pier by placing steel sheet pile is unnecessary and divers perform all underwater works. Interruption to a ship route becomes limited and it can also realize a large cost cut. Prestressed Concrete Confined Jacketing -Underwater Construction Method[PDF:305KB] PI-Slit method is a cathodic protection method which improves the anode installation method of the titanium grid protection method, and realizes labor saving and cost reduction.The line anode of one or more sheets is installed in a about 5 mm wide slot cut on the concrete surface, and cement mortar with high consistency is filled up by a pouring system or a injecting system. Cathodic Protection (Titanium Grid Protection Method) (JAPANESE)[PDF:309KB] A titanium grid protection method is a cathodic protection which uses a line anode system and external power supply equipment.The titanium grid anode is arranged in a transverse direction to the slot cut on the concrete surface. Corrosion of steel materials is controlled by applying very small electric current to steel materials. Zn Cartridge Method Inside-Insert Type (JAPANESE)[PDF:319KB] Zn cartridge method protects the steel reinforcement inside the concrete from salt damage corrosion by using anticorrosive Zinc as a sacrificial anode material. Depending on installation method of sacrificial anode material, the method divides into two types including inside-insert type and surface-installation type. Zn Cartridge Method Surface-installation Type (JAPANESE)[PDF:307KB] Zn cartridge method protect the steel reinforcement inside the concrete from salt damage corrosion by using anticorrosive Zinc as a sacrificial anode material. Depending on installation method of sacrificial anode material, the method divides into two types including inside-insert type and surface-installation type. Easy M Monitor (JAPANESE)[PDF:504KB] Easy M monitor is a mobile-typed integrated monitoring system enable to confirm the after-used activity of PI-Slit method, titanium grid method, and Zn cartridge method and evaluate corrosion of steel by self-potential method. By using this system, necessary data can be check easily at any time. Titanium Wire Sensor (JAPANESE)[PDF:336KB] Titanium wire sensor is a type of monitoring sensor used to measure the self-potential of the steel material. The economy and constructability of this sensor is excellent compared with the conventional reference electrode. By using the Easy M monitor on the structure installed with this sensor, the occurrence of steel corrosion can be checked easily. Re-injecting of Lithium-Nitrite-Containing Solution and Grout (Re-passive) Method (JAPANESE)[PDF:367KB] It repairs insufficiently filled PC grout part by pouring-in lithium-nitrite-containing solution.Because lithium-nitrite-containing solution permeates in rust and renders chloride ion harmless, corroded prestressing steel is re-passivated and corrosion is controlled. Re-injecting of Lithium-Nitrite-Containing Solution and Grout (Re-passive) Method - Passive Guard (JAPANESE)[PDF:198KB] It repairs insufficiently filled PC grout part by pouring-in lithium-nitrite-containing solution.Because lithium-nitrite-containing solution permeates in rust and renders chloride ion harmless, corroded prestressing steel is re-passivated and corrosion is controlled. Re-injecting of Lithium-Nitrite-Containing Solution and Grout (Re-passive) Method - Gap Guard (JAPANESE)[PDF:247KB] It repairs insufficiently filled PC grout part by pouring-in lithium-nitrite-containing solution.Because lithium-nitrite-containing solution permeates in rust and renders chloride ion harmless, corroded prestressing steel is re-passivated and corrosion is controlled. Investigation and Repair Method for narrow parts at Girder Ends (NSRV Method)[PDF:1.14MB] NSRV method is used to conduct investigation and repair for narrow parts (joint parts) between girders of concrete bridges, which has not repaired because of the difficulty in investigation. Bearing replacement (JAPANESE)[PDF:288KB] This is a construction method which replaces severely degraded or damaged bridge bearings with new bearings for the purpose of the functional recovery of bearings. External Tendon method (JAPANESE)[PDF:402KB] This is a construction method which uses external tendons for a member which is deficient of load bearing ability. It introduces additional prestressing force to a member and improves load bearing ability. Carbon Fibre Sheet and Plate Bonding Method (JAPANESE)[PDF:298KB] This method increases the load bearing capacity of concrete members by applying carbon fibre sheet or carbon fibre plate on the concrete surface. Sectional Repair Method (JAPANESE)[PDF:547KB] Damaged parts of concrete is removed, then removed parts are restored with cross-sectional repair material. Surface Coating Method (JAPANESE)[PDF:264KB] Prevent and suppress of concrete peeling and invasion of deterioration factors by coating concrete surface with organic coating material or non-organic coating material. Lift Up Method (JAPANESE)[PDF:512KB] It is a repair method of concrete pavement which sufferes differential settlement by raising concrete pavement by a hydraulic jack and pouring grout into a gap underneath the pavement without replacing pavement or overlaying. The work can be performed in a limited window time in the night, being able to attain laborsaving of work and efficiency by computer control, and securing high construction accuracy. 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