Hitachi Construction Machinery Co., Ltd.

Nippo Sangyo Co., Ltd.

Green Arm Co., Ltd.

Atsushi Kasahara

Kojiro Ogata

Toshio Sawa

Atsuki Gomi

Hiroshi Inamitsu

Hironari Abe

Kazuo Onoda

Masaki Tsunabuchi

Eisuke Nagai

Hideo Ikeda

Isami Fujii

Hiroaki Irie

Tomoyuki Abe

Fumio Goto

Shunsuke Ushio

A method for recycling in place an asphalt mixture layer of a paved road continuously, while moving a self-propelled vehicle system, which comprises a step of heating and softening the asphalt mixture layer, a step of scraping and breaking said hot and softened asphalt mixture layer and keeping the softened mixture at a temperature sufficient not to form an aggregate, to prepare an asphalt mixture having a single-grained structure, a sieving step of classifying said asphalt mixture having a single-grained structure into a plurality of grain size groups, a step of designing mix proportions for converting said asphalt mixture to a recycled asphalt mixture by the use of said plurality of grain size groups classified, a step of mixing uniformly said recycled asphalt mixtures having designed mix proportions, and a step of spreading and compacting said recycled asphalt mixtures having been mixed uniformly, to thereby form a recycled asphalt mixtures layer.

Method for continuous on-site recycling of an asphalt mixture layer of a pavement and a motor-driven vehicle system therefor

The object of the present invention is to provide a road surface roughness measuring apparatus for measuring the coefficient of dynamic friction and the roughness of the road surface in each direction at a same section where the coefficient of dynamic friction is measured, said apparatus divides the measuring circle on the road surface into a plurality of sections, on which measuring circle the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction. The road surface roughness measuring apparatus has: a frame ( ) having a plurality of legs ( ) used for placing the apparatus on a road surface (G); a rotary shaft ( ) mounted on the frame ( ) and extending vertically; a rotary encoder ( ) mounted on the top end of the rotary shaft ( ); a rotation plate ( ) mounted on the bottom end of the rotary shaft ( ); a motor ( ) provided with a speed reducing gear and for driving the rotary shaft via gears ( ); and a laser displacement gauge ( ) mounted on the rotation plate ( ). The laser displacement gauge ( ) is disposed in such a way as to measure a road surface roughness along a measuring circle (P) on which the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction by the rotation of the rotation plate. The measuring circle (P) is divided into a plurality of sections and the road surface roughness for each section (a to h) is calculated based on the signals of the laser displacement gauge ( ) and the rotary encoder ( ).

Road surface roughness measuring device

Growing community of inventors

Sapporo, Japan

Atsushi Kasahara