Through the cable to ensure that the sanity - Renaissance support highway bridge pavilion, a month viaduct ~
Pavilion viaduct (photo: kajima (strains))
The revival of the east Japan earthquake constantly promoting traffic infrastructure construction
In March 2011, the east Japan earthquake caused serious damage.Loss involving multiple directions, among them, railway and highway transportation network blocking, huge impact brought to the region.Again but, this makes people realize the highway, as an essential part of human aid and supplies in emergency transportation roads, and affected its connection to the importance of and inland areas.To have this, sumitomo electric industries as soon as possible after an earthquake automatic pilot program mission of revival northeast central lane phase mahfud island road "moon house viaduct" provides a PC steel products.
Salt and frost damage subject to achieve longevity
Month pavilion viaduct bridge is 462 m long, for the phase mahfud island on the largest PC highway Bridges.In charge of the construction management is kajima (strains) of morita YanShi.
"Required is one of the elements of longevity.Considering the regional salt injury and freezing injury risk is high, in order to reduce life cycle cost in the future, requires high durability.In addition to the quality of the concrete itself, high durability of PC steel products is essential"
Based on the demand, sumitomo electric industries in addition to ordinary anti-corrosion PC steel, also provides with double anti-corrosion PC of PE coated steel.For the fixed system, also provides epoxy powder coating can prevent the salt injury after products.
The monitoring of PC steel tension
In the construction, sumitomo electric is epoch-making technology were introduced.That is embedded in the fiber optic sensor PC steel fiber embedded stranded wire.By measuring the deformation produced by optical fiber, successfully mastered technology is difficult to grasp the past PC steel tension in the distribution of length.Because internal embedded in epoxy resin coating, construction without the risk of damage to fiber, long-term measurement can be performed.This product is made of kajima (strains), HIEN electrician (strain) and sumitomo electric these 3 companies to jointly develop products.Kajima (strains) had I straight tree is one of the members of the leadership development.
"Moon pavilion viaduct PC Bridges such as one of the requirements for construction and maintenance management, is the tension of PC steel products management.Therefore, we consider kajima (strains) to test the fiber tension long-term vision to achieve.To solve integration of optical fiber and PC steel, PC steel experts - sumitomo electric technical strength is indispensable"
PC steel and fiber optic construction site are faced with the problem of integration
In sumitomo electric one party is responsible for developing and sichuan, yaws.
"By developing the epoxy resin embedding optical fiber, achieve full integration of production technology, on the basis of maintaining PC steel high durability, also successfully added the function of the sensor of longevity.However, due to the cladding is very strong, will be connected to gauge the fiber from the PC steel work extremely hard.At first we used the human cutting way, spent a great deal of time, the influence on the progress of the construction"
And sichuan in the development of technology and others will be after the accumulation of knowledge gathered together.They to strip away the PC steel cladding layer, take out the tools and methods of the optical fiber discussed many times, finally greatly shorten the operation time.
"Based on the tension of fiber optic sensor management is the product of landmark.In the future, will focus on how to use monitoring data.I hope with sumitomo electric employees, from the overall perspective, to promote the deepening of maintenance and management technology."Once our ministry's (the above)
In addition, sumitomo DianGongSuo development of fixing the tension detection of magnetic tension sensor "SmART Cell ™" is also used in month pavilion in the viaduct.Is not only the development of PC steel and fixed system and supply and its surrounding systems products group of enrichment, also improve the reliability of the PC technology.
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