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Volume 78, Issue 10
Displaying 1-8 of 8 articles from this issue
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[in Japanese]2005 Volume 78 Issue 10 Pages 369
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSDownload PDF (153K) -
Masanori HANSAKA2005 Volume 78 Issue 10 Pages 370-375
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSSteel railways bridges characteristically tend to generate high-level noise. Its reason is that not only high-level of structure-borne noise generated but also rolling noise is directly transmitted to trackside. Therefore, many efforts have been so far devoted to decrease the degree of vibration and noise of steel railway bridges. The countermeasures against noise generated adjacent to steel railways bridges are classified into the following five technologies: decrease of rolling noise, isolation of vibration, vibration damping, isolation of noise and noise absorption.
Many of them have adopted application of rubber materials for the purpose as intended. This paper describes the outline of these technologies to decrease the vibration and noise attributed to steel railway bridges.View full abstractDownload PDF (1234K) -
Toshikazu YOSHIZAWA2005 Volume 78 Issue 10 Pages 376-382
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSDestructive earthquakes may happen anytime anywhere at. Many lives and property were lost, and public traffic and life-lines suffered from damages in the past seismic events. Seismic isolation technology has gained popularity in the recent decade as one of the measures fo+r seismic protection of structures, and elastomeric isolators are the essential devices which construct seismic isolation systems. In this paper, principle of seismic isolation, actual records obtained in seismic-isolated structures, characteristics and requirements of isolators, basic issues of rubber materials and aging properties, and recent activity regarding development of ISO standards are introduced.View full abstractDownload PDF (1939K) -
Keiichi HASEGAWA2005 Volume 78 Issue 10 Pages 383-387
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSThe function of expansion joints for highway bridges is to pass loads and to provide safety to the traffic over the gap between the bridge girder and the abutment or between two bridge girders. The rubber expansion joints follow much more easily to the horizontal movement and the rotation than the steel expansion joints. But the rubber expansion joints have the inferior abrasion resistance to the steel expansion joints.
In this paper, the change of requirements under the circumstances around the expansion joints is mentioned and the newly developed rubber expansion joint is introduced.View full abstractDownload PDF (1057K) -
Teruhiko MARUYAMA, Kazuo SUGA2005 Volume 78 Issue 10 Pages 388-392
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSAsphalt rubber (AR) is a blend, which includes 5-23wt% of rubber component, of asphalt cement, reclaimed tire rubber, and certain additives.
In this study, the samples have been prepared by so-called “wet process”, which smoothly caused swelling and reaction of the rubber with hot asphalt cement.
AR provides high quality road condition such as thermal cracking and rutting free surface, high skid resistance, low road noise, and so on.
We have researched the factors which affect swelling and degradation of crumb rubber in the asphalt. Then, we can apply the result for the design of Japanese AR pavement, which is required premium grade quality.View full abstractDownload PDF (1088K) -
Masanori IGAKI2005 Volume 78 Issue 10 Pages 393-397
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSRubbers are widely used as housing materials because of their outstanding airtight properties, acoustic properties, water proofing properties and safety features. In the housing field, several demands have been made, for example earthquake resistance, high airtightness and barrier-free systems. Those demands are ever-increasing. On the other hand, there is a problem of indoor noise associated with high airtightness.
This report introduces housing rubber materials, focusing on those used as airtight materials, soundproof and vibration-proof materials.View full abstractDownload PDF (951K) -
Hitoshi AKIYAMA2005 Volume 78 Issue 10 Pages 398-402
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSThe inflatable dam has been used over forty years to control water. Recently the application of this rubber bag to the anti-disaster facility, especially flood control has been paid attention. Here, the applications of the inflatable dams are introduced, such as; flood control dam, expansion gate which is the rubber inflatable valve in the sewer pipe, anti- flood weir which is the small inflatable dam installed at the entrance of facility, the tidal barrier which is the inflatable dams against the flood by the high tide, and the inflatable water break which protects the port from the outside ocean waves. The basic function of these rubber bags is to stop the water or wave by its flexible nature regardless its size. The recent large disasters such as the Tsunami in Indian Ocean and the flood and the earthquake in Niigata inspired the possibility of the inflatable rubber bag as the effective facility.View full abstractDownload PDF (2380K) -
[in Japanese]2005 Volume 78 Issue 10 Pages 403
Published: 2005
Released on J-STAGE: May 19, 2008
JOURNAL FREE ACCESSDownload PDF (203K)
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