Self-propelled operating apparatus for the regeneration pavement

• US 4,453,856 A
• Filed: 06/05/1981
• Issued: 06/12/1984
• Est. Priority Date: 06/05/1981
• Status: Expired due to Fees

• Current Assignee: Autostrade-Concession Ecostruzioni Autostrade SPA
• Original Assignee: Autostrade-Concession Ecostruzioni Autostrade SPA
• Inventors: Ceseri, Pierluigi, Chiostri, Mario
• Primary Examiner(s): Byers, Jr., Nile C.
• Application Number:
  US06/271,018
• Time in Patent Office: 1,103 Days
• Field of Search: 464/91, 464/90, 464/77, 464/79, 464/75, 464/95
• US Class Current: 404/91
• CPC Class Codes: E01C 23/065 Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving in situ mixing of hydraulic cement concrete E01C19/025; apparatus for in-plant recycling E01C19/1004, E01C19/1036

Abstract

A self-propelled pavement lane apparatus comprising a radial-frequency microwave generator extending across one lane of the roadway having an antenna with a slotted waveguide directed toward the roadway for heating a lane-wide stretch of the roadway. A ripping device is provided behind the microwave generator to rip up pavement which was heated by the microwave generator. A screw conveyor conveys the heated and ripped pavement inwardly toward a central axis of the apparatus where it is fed by a chute to a mixing chamber containing counter-rotating mixing blades. Fresh bituminous binder and/or filler may be added to the mixing chamber to be mixed with the ripped pavement which is then discharged from the mixing chamber by a second screw conveyor, to be distributed across the lane. Following the second screw conveyor is a finished plate for initially compacting the refinished surface. The apparatus includes a tank for containing hydraulic fluid for operating a generating unit to power the microwave generator as well as tanks for the filler and binder.

Claims

1. A self-propelled operating apparatus for resurfacing roadway pavement, one lane at a time, which pavement is made of a bituminous mix, comprising:

a single frame;

drive means mounted on said frame for propelling said frame on a lane of a roadway to be resurfaced in an operating direction;

steering means connected to said frame and said drive means for steering said frame as it is propelled on a roadway in said operating direction;

an electric generating unit mounted on said frame;

wave-guide antenna means connected to said frame at a forward end thereof extending transversely to said operating direction and of a length to extend substantially across the lane of roadway to be resurfaced, said wave-guide antenna means comprising at least one wave-guide having an open space and a slotted bottom surface adapted to face the roadway with a plurality of slots extending in said operating direction and spaced on said wave-guide transversely to said operating direction, said wave-guide having a short circuit plug plate closing one end thereof and an opposite end;

the radial-frequency generator mounted on said wave-guide adjacent said opposite end thereof and connected to said electric generating unit for generating microwaves;

a tri-gate power circulator mounted on said wave-guide adjacent said opposite end thereof and connected to said radial-frequency generator and said wave-guide at said opposite end thereof for distributing microwave energy to the interior of said wave-guide;

a resistive load mounted on said wave-guide adjacent said opposite end thereof and connected to said tri-gate power circulator for absorbing at least some micro-wave energy reflected inside said wave-guide back to said circulator;

a coolant storage tank mounted on said frame connected to said radial-frequency generator for supplying coolant thereto and cooling said radial-frequency generator;

ripping means connected to said frame and extending downwardly for engaging a roadway to be resurfaced, said ripping means positioned behind said wave-guide antenna means in said operating direction and sufficiently close to said wave-guide antenna means for ripping up roadway to be resurfaced while the roadway to be resurfaced is still hot after having been heated by micro-wave energy leaving said wave-guide antenna means;

first conveyor means connected to said frame and extending downwardly thereof toward a roadway surface and behind said ripping means in said operating direction for collecting roadway surface ripped by said ripping means and moving it toward a central axis of said frame in said operating direction;

movable shaving blade and chute means movably mounted to said frame and extending below said frame behind said first conveyor means in said operating direction for directing material conveyed by said first conveyor means away from a roadway from which the material came, said shaving blade and chute means being movable away from a roadway to permit material conveyed by said first conveyor means to remain on the roadway;

mixing means mounted to said frame adjacent the central axis thereof including a mixing chamber having a forwardly facing inlet in said operating direction positioned behind said shaving blade and chute means in said operating direction, and a rearwardly facing outlet behind said inlet in said operating direction, said chamber having a closed bottom between said inlet and outlet, said mixing means including a pair of counter-rotating blade mixers for mixing material supplied into said inlet from said shaving blade and chute means;

a bituminous binder tank mounted on said frame;

tubing connected between said tank and the top of said mixing chamber having a plurality of injection nozzles for directing bituminous binder into said chamber;

a filler tank mounted on said frame having a peforated bottom portion positioned over a forward portion of said mixing chamber in said operating direction;

dosing means movably mounted to said frame in said filler tank for dosing filler material to said mixing chamber;

second conveyor means mounted to said frame and positioned behind said mixing chamber outlet in said operating direction for distributing material from said mixing chamber outwardly from said central axis across a lane of a roadway to be resurfaced; and

finishing plate means mounted to said frame and extending below said frame behind said second conveyor means in said operating direction for compacting material onto a roadway to be surfaced, which material is provided from one of said mixing chamber outlet and an area of roadway to be surfaced below said mixing chamber.

2. An apparatus according to claim 1, wherein said radial-frequency generator comprises a magnetron forming a microwave radio-frequency oscillator for generating wave power in the millimeter wave length.

3. An apparatus according to claim 1, including a shielding cap made of modular copper elements positioned over and covering tops and sides of said wave guide antenna means, a downwardly extending flexible member connected to a lower forward and rear periphery of said cap in said operating direction.

4. An apparatus according to claim 2, wherein said mixing chamber is mounted on said frame so that a bottom thereof is positioned at a small distance fron the roadway to be resurfaced when said apparatus is used to resurface the roadway, said shaving blade and chute means comprising a shaving blade positioned between said first conveyor means and said mixing chamber inlet and a chute extending from said mixing blade up toward said mixing chamber inlet.

5. An apparatus according to claim 1, including lifting means connected between said wave guide antenna means and said frame for changing a height of said wave guide with respect to a roadway surface.