AU601027B2 - Pavement repair unit - Google Patents

Description

C)

SCOMMONWEALTH OF AUSTRALIA PATENTS ACT, 1952 VM COMPLETE SPECIFICATION FOR OFFICE USE Short Title: Int. Cl.

Application Number: a er.. U Lodged: Complete Specification Lodged Accepted: Lapsed: Published: Priority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Richard Andrew Howling Address of Applicant: 29 Horbury Street, SANS SOUCI N.S.W. 2219 Actual Inventor: Richard Andrew Howling Address for Service: ANDERSON-TAYLOR ASSOCIATES, Registered Patent and Trade Mark Attorneys of Carina Road Oyster Bay N.S.W. 2225 Complete Specification for the invention entitled: PAVEMENT REPAIR UNIT The following statement is a full description of this invention including the best method of performing it known to me:- -1i i _r This invention relates to apparatus for the repair of pavement and more particular-ly although not exclusively.the repair of bitumen road surfaces.

At present the usual practice for repairing minor defects in road surfaces is to simply shovel a hot bitumen mix into the crevice or pothole and then screed it flat with the surrounding surface. Alternatively in situations where a higher standard of repair is required the pothole may be excavated back to stable material, primed with a setting agent, filled with appropriate aggregate, again 'coated with a cold setting agent and finally compacted with a vibratory roller or the like. Such existing methods however are time consuming, labour intensive and moreover expose the workers to the extremes of weather and the danger of passing traffic.

It is therefore an object of this invention to ameliorate the aforementioned disadvantages and accordingly there is disclosed a vehicle for repairing a pavement defect such as a pothole, crack or the like comprising in operative combination an excavating means to clear said defect of debris, metering means for depositing measured amounts i of fill into said defect and'compaction means for subsequently levelling said fill to conform to the surrounding pavement, said excavating and compaction means being located on a slewing boom attached to the vehicle chassis and pivotable about a vertical axis at or adjacent the front of said chassis and said boom S,-2-

I

'I

I

I

'I

also including a mixing chamber for compounding said.

fill from separate supplies of aggrigate and emulsion.

Preferably said vehicle is self.-propelled and adapted to be operated on on conventional road surfaces by a single operator.I If I I I I I SI I 4~I I I I

III.

ft I I I ff1 If I S f S f SI S 1ff 55 I I 5115 f 55(1 SIll 4 1 II I 1115 S ~tI It IL I III I

A

-2a- One preferred embodiment of this invention will now be described with reference to the attached drawings in which: Figure 1 shows a schematic side view of a vehicle according to this invention, and Figure 2 shows a schematic plan view of the vehicle of figure i.

or Referring first to figure 1 the vehicle basically comprises o o a chassis i, enclosed operators cabin 2 and rubberized tyres 3. An extendible slewing boom 4 is attached pivotably in the horizontal 555544 plane to the front of the vehicle and mounts at the free end thereof a high pressure air nozzle for cleaning the defect prior to o 5 4m o repair, additional spray heads for applying a priming agent o 44 or tack coat and a high speed low amplitude vibratory screed 5. Stabaliser legs may also be provided under the front end of the chassis to steady the vehicla during the filling operation as described later. The rear of the chassis preferably carries a 1000 litre emulsion tank 6 and storage hoppers 7 for cold pre-mixed aggregate. A screw conveyor 8 is provided under the chassis to carry the aggregate from these hoppers 7 to a mixing chamber 9 at the discharge end of the boom 4. To power the aforementioned apparatus and supply pressure for the cleaning and spray nozzles a diesel powered compressor and hydraulic 'pumps 10 are also mounted on the vehicle.

-3- 18 In operation the vehicle would patrol roads or other paved surface 11. Upon encountering a defect such as a pothole or the like the operator extends and lowers the boom from it's raised position 11A so as to be over the area needing repair. A blast of high pressure air from the boom mounted cleaning nozzle is then used to dislodge and remove debris from the immediate area. Following this the vibratory screed is engaged which preferably automaticallv brings the compressor/hydraulic systems and their associated driven apparatus to the required operating range.

o a4 By manipulating the boom and built-in spray nozzles the o o 04 primer or tack coat is first applied followed by the cold a 0e a o aggregate (supplied by the screw conveyor) and liquid binder.

o aP These latter components are blended in the mixing chamber 9 and discharged o 4 down the vibratory screed. The screed subsequently operates to compact and level the deposited fill so that it conforms o the surrounding pavement surface.

As mentioned earlier the various mechanisms for preparing the defect and handling the fill are preferably hydraulically powered and controlled from the drivers cabin 2. The operator thus remains within the vehicle and completely protected from traffic and the extremes of weather.

It will thus be appreciated that this invention at least in the form of the embodiment disclosed provides a novel and unique apparatus for the repair of roads and other paved surfaces. Clearly howeverthe particular example described is only the currently preferred form of this invention and a wide variety of modifications may be made -4- Ui which would be apparent to a man skilled in the art. For example the shape and configuration of the vehicle, as well as the placement and design of the-storage hopper, mixing unit, compressor/ hydraulic pumps and boom may all be changed according to application. Also while the vehicle described is adapted for use with cold pre-mixed aggregate fillers the invention extends to any other type of material such as concrete etc. Indeed it is presently envisaged that the unit with suitable modifications could be adapted for use with hot bitumen mix by providing additional heating and blending chambers.

i r r t r tr r r :r ri t r r ?rr rt r Irr r rr r r r t r e f i 111-.

Claims (4)

1. 2. The vehicle as claimed in claim 1 wherein one or more storage hoppers for said aggregate are located at the rear of the vehicle and a screw conveyor extends under the chassis of the vehicle to carry said aggregate to said mixing chamber where it is mixed with said emulsion to form the fill.
2. 3. The vehicle as claimed in claim 1 or 2 wherein said compacti6n means comprises a vibratbrylscreed.
3. 4. The vehicle as claimed in any one of the preceding claims wherein the excavating, metering and compaction Idp d means are hydraulically and/or pneumatically operable from a cabin on said vehicle. vehicle as claimed in any one of the preceding claims wherein said boom is movable between a raised 1 inoperative position and a lowered operative position.
4. 6. The vehicle as claimed in any one of~lthe preceding claims wherein said excavating means comprises a high pressure air stream. 1 7. A vehicle for repairing a pavement defect, said vehicle being substantially as described herein with reference to the drawings. Dated this Z" day of Aldoelz 1990 Richard Andrew Howling By his Patent Attorney MICHAEL ANDERSON-TAYLOR N 7