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Maintenance Technology

Maintenance Technology

a) Bridge maintenance

MethodsOutlineLeaflet
Cathodic protection(titanium grid protection method)
Cathodic protection
(titanium grid protection method)
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.
PDF

(JAPANESE)

Cathodic protection(PI-Slit protection method)
Cathodic protection
(PI-Slit protection method)
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.
PDF
External Tendon method
External Tendon method
It 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. PDF

(JAPANESE)

PC Confined Jacketing
PC Confined Jacketing
PC Confined Jacketing is one of seismic retrofit methods of bridge piers using high-strength post-tensioning strands as hoop reinforcement. Post-tensioning provides piers with active confinement. It improves load capacity, ductility and energy absorption. PDF

(JAPANESE)

PC Confined Jacketing –Underwater
PC Confined Jacketing –Underwater
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.
PDF
Deck slab replacement
Deck slab replacement
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. PDF

(JAPANESE)

Bearing replacement
Bearing replacement
It is a construction method which replaces severely degraded or damaged bridge bearings with new bearings for the purpose of the functional recovery of bearings. PDF

(JAPANESE)

NSRV method
NSRV method
NSRV method is a vertical girder-end repair method at narrow space.
Investigation and repair in the vertical plane of the girder end of a concrete bridge is generally difficult. NSRV method makes it possible to perform investigation and repair in the vertical plane of the girder end rapidly in a limited window time.
PDF

(JAPANESE)

Re-injecting of lithium-nitrite-containing solution and grout (Re-passive) construction method
Re-injecting of lithium-nitrite-containing solution and grout (Re-passive) construction method
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.
PDF

(JAPANESE)

b) Others

MethodsOutlineLeaflet
Lift up method
Lift up method
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. PDF

(JAPANESE)

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