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
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
  • E01C19/43—Machines or arrangements for roughening or patterning freshly-laid paving courses, e.g. indenting rollers
• • 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
  • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
  • E01C23/02—Devices for making, treating or filling grooves or like channels in not-yet-hardened paving, e.g. for joints or markings; Removable forms therefor; Devices for introducing inserts or removable insert-supports in not-yet-hardened paving
  • E01C23/028—Positioning or producing markings, e.g. by forcing marking materials into the surface, by scoring
• • 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
  • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
  • E01C23/14—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces for heating or drying foundation, paving, or materials thereon, e.g. paint
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
  • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
  • E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
  • E01F9/506—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users characterised by the road surface marking material, e.g. comprising additives for improving friction or reflectivity; Methods of forming, installing or applying markings in, on or to road surfaces
  • E01F9/512—Preformed road surface markings, e.g. of sheet material; Methods of applying preformed markings

Definitions

• the first pattern may be formed in the thermoplastic sheet and the substrate simultaneously.
• the pre-formed thermally settable sheet is placed on an unpatterned substrate.
• the sheet in then gradually heated in situ to a temperature sufficient for the first surface of the sheet to adhere to the substrate.
• the sheet and the substrate are then imprinted to form the first pattern, such as by compressing a template placed on the second, exposed surface of the sheet.
• the second surface Prior to placing the template on the sheet second surface, the second surface may be treated with a bond reduction agent or coolant to minimize adherence between the template and the hot thermoplastic material of the pre-formed sheet.
• Figure 3 is a perspective view of an apparatus comprising reciprocating infrared heaters for gradually heating a work site.
• Figure 7 is a cross-sectional view showing the coating conforming to the contour of the patterned asphalt surface.
• Figure 8 is a an exploded, perspective view of a pair of pre-formed thermoplastic sheets being placed in alignment on a patterned asphalt surface.
• Figure 15 is a perspective view showing a further template for stamping the thermoplastic of Figures 13 and 14 after it has partially cooled to produce a more precisely defined thermoplastic coating.
• a pattern may be formed in asphalt surface 12, for example, according to the method of the Applicant described in United States Letters Patent No. 5,215,402 which is hereby incorporated by reference. More particularly, a template 20 is placed on asphalt surface 12 ( Figures 1 and 2) while it is in a pliable state (i.e. after being freshly rolled with hot asphalt or after surface re-heating). Template 20 is then compressed into asphalt surface 12 with a drum roller 24 or some other compaction apparatus to form pattern 22 therein.
• pattern 22 may be an impression simulating the appearance of bricks and mortar or some other decorative appearance. Template 20 is then removed from surface 12 to expose pattern 22 ( Figure 1). In alternative embodiments, pattern 22 could consist of protrusions rather than impressions formed in surface 12, or some other surface texturing. Other similar means for forming pattern 22 in asphalt surface 12 may be envisaged.
• thermoplastic sheet 14 As shown in Figures 4 and 5, after pre-formed thermoplastic sheet 14 is placed on asphalt surface 12 overlying pattern 22, infrared heaters 30 are reciprocated over sheet 14 to gradually melt the thermoplastic material (in Figure 5, only the portion of apparatus 26 comprising heaters 30 is illustrated to aid in clarity).
• An important advantage of the heating method of Figure 1 is that a relatively large sheet 14, or group of sheets 14, and underlying asphalt surface 12 can be heated gradually and evenly. This approach avoids the disadvantages of hand-held torch heaters which cannot easily be used to evenly heat large areas and have a tendency to scorch the thermoplastic material and/or the underlying substrate. For example, depending upon their composition, some thermoplastic sheets 14 and/or asphalt surfaces 12 can scorch when subj ected to sustained temperatures above approximately 325°F.
• asphalt surface 12 and thermoplastic sheet 14 are allowed to partially cool after each heating cycle.
• the temperature of surface 12 (and sheet 14 applied thereto) increases gradually with successive heating cycles until the desired temperature suitable for thermoplastic/asphalt adhesion is achieved.
• the asphalt surface 12 is thereby subjected to a relatively slow heat soak to permit heat to gradually penetrate through and around sheet 14 below the uppermost surface layer of the asphalt.
• surface 12 and sheet 14 are gradually heated to a temperature within the range of 150 - 45O 0 F and most preferably within the range of of approximately 150 - 45O 0 F.
• Figures 13 - 16 illustrate a further embodiment of the invention.
• a pattern 22 is formed in asphalt surface 12 using a template 20 and sheet(s) 14 are then placed on the imprinted surface and heated in situ as described above. This causes sheet(s) 14 to melt and conform to pattern 22, forming a coating 10 on asphalt surface 12 ( Figures 13 and 14).
• the thermoplastic coating 10 is then allowed to partially cool and is subjected to a post- heating stamping step.
• coating 10 may be allowed to cool to a temperature of 140° F, although the temperature may vary depending on the type of thermoplastic and ambient conditions.
• the post-heating stamping step may comprise placing a further template 50 on the partially cooled coating 10 while the thermoplastic is still pliable (Figure 15).
• template 50 has a pattern matching the pattern of template 20 but has wire elements having a slightly smaller diameter to avoid displacing thermoplastic from the simulated grout line or other pattern during the stamping step.
• template 20 may have wire elements approximately 3/8 inches in diameter and template 50 may have wire elements approximately 1/4 inches in diameter.
• template 50 When template 50 is compressed in coating 10, it causes the thermoplastic to more precisely conform to the underlying pattern 22, resulting in a sharper and more well-defined visual appearance. This is evident by comparing the simulated grout line of Figure 14, before the stamping step, with the simulated grout line of Figure 16, after the stamping step.
• the grout line of Figure 14 has a shallow, rounded profile whereas the grout line of Figure 16 has a deeper, better defined rounded profile which more closely matches the contour and depth of pattern 22 formed in asphalt surface 12.
• the grout line of Figure 16 therefore better simulates the desired visual effect.
• thermoplastic sheets 14 may be somewhat larger in thickness than in other embodiments of the invention. As indicated above, sheets 14 are typically in the range of 30 - 150 mil in thickness, or more particularly 50 - 125 mil, or 90 - 120 mil in thickness. In this embodiment of the invention sheets 14 may be in the range of 150 - 250 mil in thickness, although sheets 14 of a lesser thickness may also be used. In particular embodiments of the invention sheets having a thickness in the range of 175 - 225 mil may be used.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Road Repair (AREA)
• Road Paving Structures (AREA)
• Laminated Bodies (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

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Citations (4)

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• 2007
  • 2007-10-25 US US11/924,421 patent/US8133540B2/en active Active
  • 2007-10-26 CA CA2608668A patent/CA2608668C/en active Active
• 2008
  • 2008-10-24 DK DK08841909.8T patent/DK2219866T3/da active
  • 2008-10-24 AU AU2008316278A patent/AU2008316278B2/en not_active Ceased
  • 2008-10-24 EP EP08841909.8A patent/EP2219866B1/en active Active
  • 2008-10-24 PT PT88419098T patent/PT2219866E/pt unknown
  • 2008-10-24 WO PCT/CA2008/001867 patent/WO2009052619A1/en not_active Ceased
  • 2008-10-24 JP JP2010530231A patent/JP5400052B2/ja not_active Expired - Fee Related
  • 2008-10-24 ES ES08841909.8T patent/ES2469667T3/es active Active

Patent Citations (5)

Non-Patent Citations (1)

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