Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
  • E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing

Definitions

• the present invention relates to a method for carrying out road maintenance works on road surfaces covered by a 5. bitumenous top layer and to means for carrying out the method.
• the invention is concerned with the other class of paving methods wherein a liquid asphalt binder and an aggregate, preferably a crushed stone material, are applied in separate layers to the roadway and then the aggregate is compacted into the binder.
• a method falling into the latter class is known as a single pass surface treatment or surface dressing, which may be applied to any prepared surface and is frequently applied to existing bituminous paving in order to provide a new and smooth surface and to make the old paving waterproof and
• This method usually entails the steps of sweeping the old base in order to remove dirt and other foreign matter and then applying a coat of a liquid asphalt binder to the base, covering the coat of asphalt binder with a layer or course of crushed stone material, rolling the
• the binder should be applied -in ⁇ - ⁇ -r--
• Vv ' IPO « such a thin layer that the stone layer gets bound, but is maintained disintegrated on its top side.
• the binder should be applied in a thicker layer for binding the cover layer in a safe manner, with-
• road portions i.e. the normal wheel track portions thereo and the less loaded portions therebetween, and as well known the results is generally dissatisfying in that loose stone material appears on the said less loaded portions wh le the heavy loaded track portions are liable to get black,
• the invention is based on the idea that it is in fact possible to detect the load distribution caused by the traffic over the width of the road. This can be done photoelectrically or otherwise.
• the load distribution can be done photoelectrically or otherwise.
• the binder may be applied to the road surface by means of a moving cross boom pro ⁇ vided with a.plurality of binder outlet nozzles of indi ⁇ vidually adjustable capacity, whereby the binder is appli ⁇ cable simultaneously all over the width of the road or a
• the said load detection may be carried out by a direct regist ⁇ ration of the load distribution as sensed by guage means mounted for selective load registration across the respo e r c ro n e gu ge me .
• guage means When the guage means are kept operative during a repre ⁇ sentative interval of time and the measuring results are caused to be memorized, according to any suitable princip- 5. les, it is possible to thereafter read out the relevant data pertaining to maximum and/or avarage load on the single ' portions of the width of the road at the particular place, and when a measuring place is chosen which is representa ⁇ tive of a considerable length of the road, the binder can
• the measuring equipment which belongs to the present invention, may be so adjusted that the data read-out is usable in a direct manner for the differentiated setting of the capaci-
• the mea ⁇ suring system is so adapted that it provides for registra ⁇ tion solely of traffic above a predetermined minimum weight.
• the mea ⁇ suring system is so adapted that it provides for registra ⁇ tion solely of traffic above a predetermined minimum weight.
• the invention comprises the possibility of car ⁇ rying out a real rigidity measurement by pointwise check ⁇ ing the intrusion effect, in depth and time, of a loaded test member into the road surface, and from this test obtain ⁇ ing a readable result which is usable as a parameter for the
• Fig. 1 is a top view showing a preferred embodiment o a traffic load measuring device accroding to the invention.
• Fig. 2 is a side view of the device of Fig. 1.
• maintenance programme for a certain road surface to be reno vated by a so-called surface dressing operation it has been found very important to know precisely the actual traffic load picture of- the roadway in question.
• a measuring band structure as shown in Figs. 1 and
• the band structure shown comprises a rubber mount ⁇ ing base.plate portion 2 provided with a plurality of mutu ⁇ ally spaced contact members 6 adapted to be activated by
• the whole measuring band structure is held in correct position across the road surface or preferably only across
• registering means being able to store the traffic load picture of the road being measured by the activation of the contact members 6 during the measuring period of time.
• 35- to the improved method of the invention is the strength con ⁇ dition of the existing road and for measuring the same may be used a device which comprises a stand having three sup ⁇ porting legs, which are rested directly on the road surface to be measured while a measuring leg is provided with a steel ball adapted to intrude into the road surface in ⁇ fluenced by a load body which may be supported solely upon the steel ball.
• steel ball will be indicative of the strength of the sur ⁇ face, and the device comprises a measuring equipment for - regisering this intrusion- epth in respect of the period of time of the strength test.
• the hardness was determined in a number of points
• the amount of aggregate that can be retained on the 10. road surface was determined experimentally in a simple dress- ing with the given amount of aggregate. By doing so it is possible to calculate the average void volume in the aggre gate layer.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Repair (AREA)
• Road Paving Structures (AREA)
• Road Signs Or Road Markings (AREA)
• Length Measuring Devices With Unspecified Measuring Means (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10502786

Family Applications (1)

Country Status (14)

Families Citing this family (1)

Citations (4)

• 1980
  • 1980-01-22 GB GB8106415A patent/GB2066880B/en not_active Expired
  • 1980-01-22 JP JP50034980A patent/JPS55501151A/ja active Pending
  • 1980-01-22 WO PCT/SE1980/000020 patent/WO1980001578A1/en active Application Filing
  • 1980-01-22 CH CH725980A patent/CH647026A5/de not_active IP Right Cessation
  • 1980-01-22 AT AT0906480A patent/AT376466B/de not_active IP Right Cessation
  • 1980-01-22 NL NL8020020A patent/NL8020020A/nl active Search and Examination
  • 1980-01-22 DE DE803030678A patent/DE3030678A1/de not_active Ceased
  • 1980-01-24 NZ NZ192712A patent/NZ192712A/xx unknown
  • 1980-01-24 AU AU54907/80A patent/AU527820B2/en not_active Ceased
  • 1980-01-29 CA CA000344576A patent/CA1138243A/en not_active Expired
  • 1980-09-26 NO NO802856A patent/NO151628C/no unknown
  • 1980-09-29 DK DK410980A patent/DK410980A/da not_active Application Discontinuation
• 1981
  • 1981-02-12 SE SE8100969A patent/SE418879B/sv not_active Application Discontinuation
  • 1981-02-27 SU SU813252575A patent/SU1118293A3/ru active

Patent Citations (4)

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