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WO1995017553A1 - Procede de renforcement de revetements de chaussee presentant les proprietes de matieres plastiques et treillis de renforcement utilise avec celui-ci - Google Patents

Procede de renforcement de revetements de chaussee presentant les proprietes de matieres plastiques et treillis de renforcement utilise avec celui-ci Download PDF

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Publication number
WO1995017553A1
WO1995017553A1 PCT/SE1994/001243 SE9401243W WO9517553A1 WO 1995017553 A1 WO1995017553 A1 WO 1995017553A1 SE 9401243 W SE9401243 W SE 9401243W WO 9517553 A1 WO9517553 A1 WO 9517553A1
Authority
WO
WIPO (PCT)
Prior art keywords
net
nets
reinforcement
edge
rods
Prior art date
Application number
PCT/SE1994/001243
Other languages
English (en)
Inventor
Kenneth Elofsson
Lars Erik Nilsson
Original Assignee
Fundia Bygg Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fundia Bygg Ab filed Critical Fundia Bygg Ab
Publication of WO1995017553A1 publication Critical patent/WO1995017553A1/fr

Links

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
    • E01C11/00—Details of pavings
    • E01C11/16—Reinforcements
    • E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings

Definitions

  • the present invention relates to a method of reinforcing coatings of a material having plastic deformation properties, such as asphalt coatings, in which a reinforcement net comprised of mutually joined rods or like elements made of steel, plastic or some other rigid material, are laid side- by-side, with or without overlapping parts, and embedded in the coating material.
  • the invention also relates to a reinforcement net for use when reinforcing such coatings.
  • the word coating is used both alone and in compounds for the coating including possible underlying base course of a material having plastic properties
  • asphalt is used both alone and in compounds for the mixture of bitumen and ballast or aggregate material, such as stone aggregates, normally used in the building of roads, airports, parking areas, stock yards and like structures.
  • Coatings of this kind are subjected to dynamic and/or static loads and may also be subjected to deformations, among other things as a result of becoming frozen, ground subsidence, movements that occur in constructions in contact with the coating, and movements due to temperature variations.
  • An asphalt reinforcement does not function in the same way as a concrete reinforcement.
  • steel nets and other rigid net reinforcements cannot be spliced or joined together in the same way as concrete reinforcement steels.
  • the functional difference between reinforced concrete and reinforced asphalt is that concrete is not plastic whereas asphalt is plastic, even at low temperatures.
  • tensile forces are primarily taken up by those reinforcement rods in a net reinforcement which extend perpendicularly to the direction of the tensile load and are transmitted from these rods through the welds in the net to those rods that extend in the direction of the tensile force.
  • the main object of the present invention is to provide a technique which will completely eliminate or greatly reduce the tendency of crack formation at net edges in a reinforced asphalt coating or a coating or surfacing of some other plastic material, when the structure is subjected to internal or external forces.
  • This also includes crack formation in net splices, which in this context are to be considered as two juxtaposed, contiguous or coincidental net-edge cracks.
  • a thus positioned net-edge net will prevent effectively or greatly reduce crack formations in the net edges and along splicing zones between juxtaposed nets.
  • reinforcement net is used to identify the main reinforcement in a coating structure
  • net-edge net is merely intended to identify those reinforcing nets that are placed above or beneath the edges of nets and the splicing zones in the main reinforcement.
  • the net splices may be open or have the form of overlapping parts.
  • net intersection as used in this document is meant an area in which more than two nets are mutually juxtaposed or overlap one another.
  • the crown of the road is planed down and the net-edge nets are then placed on the resultant flat surface.
  • the road surface can be flattened out with the aid of a milling machine or in conjunction with laying the surfacing material.
  • the reinforcement nets are suitably placed so that their edges will overlap, such that outwardly projecting rods of one net will extend between the rods of an adjacent net, so as to obtain a so-called finger joint between the nets.
  • Fig. 1 illustrates schematically the occurrence of a net splice crack in connection with a conventional asphalt coating reinforcement.
  • Fig. 2 illustrates the occurrence of net-edge cracks in connection with conventional asphalt coating reinforcement.
  • Fig. 3 illustrates how a net splice crack shown in Fig. 1 can be stopped by means of a net-edge net in accordance with the invention.
  • Fig. 4 shows how net-edge cracks shown in Fig. 2 can be stopped with the aid of two net-edge nets in accordance with the invention.
  • Figs. 5 and 6 illustrate two embodiments of a road surface reinforced in accordance with the invention.
  • Fig. 7 illustrates the point of intersection of four overlap ⁇ ping reinforcement nets.
  • Fig. 8 illustrates a modified reinforcement net.
  • Fig. 9 illustrates the intersection of four overlapping reinforcement nets of the kind shown in Fig. 8.
  • Fig. 10 illustrates an intersection point between reinforce ⁇ ment nets that are mutually " displaced relative to one another.
  • Fig. 11 illustrates positioning of a plurality of reinforce ⁇ ment nets with the intention of effectively preventing the occurrence of an elongated crack.
  • Fig. 1 illustrates an asphalt road surface 1 in which there is embedded reinforcement nets 2 which each consist in steel reinforcing rods which are welded together to form a net having generally rectangular meshes.
  • the road surface 1 is subjected to a vertical force generated by the wheel 3 of an automotive vehicle. As shown in the Figure, this force has resulted in the formation of a net splice crack 4 in the asphalt coating 1 between the two reinforcement nets 2.
  • the nets are shown spaced apart, although a corre- sponding crack would also be liable to occur in the case of overlapping nets, because the nets are able to move in the plastic asphalt material 1 in the direction of the tensile force.
  • Fig. 2 illustrates an asphalt road surface or coating 1 in which a conventional reinforcement net 5 is embedded.
  • the crack 6 caused by the wheel 3 is taken up effec ⁇ tively by the reinforcement net.
  • the load gives rise to net-edge cracks 7 along the edges of the reinforcement net, these cracks propagating up to the road surface.
  • Fig. 3 illustrates how the crack 4 shown in Fig. 1 can be arrested and prevented from reaching the road surface 1. This is achieved by placing a net-edge net 8 along the splicing zone between the two reinforcement nets 2, in accordance with the present invention.
  • the net-edge net 8 extends slightly in on the two reinforcement nets 2 and can be placed beneath these nets, as shown and preferred, or on top of the nets.
  • the net-edge net therewith stops the crack 4 from spreading. Any edge cracks 9 that form along the edges of the net-edge net 8 are, in turn, stopped by the main reinforcement nets 2.
  • Fig. 4 illustrates the use of a large main reinforcement net 5 for preventing the further development of a crack 6 that forms beneath the net, as shown in Fig. 2.
  • net- edge cracks 12 form along the edges of the net 5.
  • a net-edge net 10 is placed along both edges of the main net 5 with a certain overlap. These net-edge nets 10 therewith effectively arrest propagation of the edge cracks 12.
  • Figs. 5 and 6 illustrate how the technique shown in Fig. 3 can be used to reinforce the surface of crowned roads or the like.
  • the old asphalt coating 11 is milled down to obtain a flat surface which extends along the crown or the surface crown.
  • the nets 2 placed in the two halves or lanes of the road surface are arranged to meet above the flat surface on which a net-edge net 8 is placed.
  • the nets 2 and 8 are then embedded in a fresh asphalt coating 13. The nets are not lashed together in this embodiment.
  • the crown has been milled away to form a box-like cavity.
  • This technique can also be applied when reinforcing flat surfaces, with the intention of reducing the amount of fresh asphalt required.
  • Conventional flat milling has been applied in the Figure 6 embodiment.
  • the configuration illustrated in Fig. 6 can be achieved readily when planing out freshly-laid asphalt.
  • the invention can thus be applied when laying new asphalt and when re-asphalting an old surface.
  • the reinforcements illustrated in Figs. 5 and 6 function to eliminate or to greatly reduce the tendency for cracks to form along the centre line of the road surface.
  • net-edge nets are also used conveniently along the transverse splices between mutually adjacent reinforcement nets 2 and along the other longitudinal edges of the nets 2.
  • the main reinforcement nets 2 are placed so as to overlap one another at the splices or joins.
  • the reinforcing rods of each reinforce- ment net 2 will preferably project freely over a relatively long . distance, e.g. through a distance corresponding to the extension of two to five meshes in the net, along two net edges, preferably two mutually adjacent edges.
  • the rods may project out through a short distance along the remaining two edges of the net or may terminate at the point at which they are connected to the outer transverse rod.
  • Fig. 7 illustrates the overlapping of four nets constructed in this way, having rod sections 15 which project outwardly from two edges over a relatively long distance, and rod sections 16 which project from the remaining two edges over a relatively short distance.
  • the outwardly projecting rod sections 15 extend in between those rods of a respective adjacent reinforcement net that extend parallel with said rod sections, so as to obtain an effective, overlapping splice, a so-called finger splice, between adjacent nets.
  • Such an overlap splice which does not increase the thickness of the net structure, will further reduce the tendencies towards crack formation in the asphalt coating.
  • the reinforcing rods located in the circle 17 illustrating the common intersection point of the four nets are so densely packed that 1) there is a risk that asphalt will be unable to penetrate between the rod interstices and effectively embed all rods; 2) it is not possible to obtain effective adhesion between new asphalt and underlying old asphalt; and 3) that the surface cannot be compacted effec ⁇ tively.
  • Fig. 8 illustrates a solution to this problem, wherein those rod sections which project relatively far out along one side of the net are shortened at one corner of the net, as illustrated at 18. The point at which the four nets intersect will not then contain more reinforcement rods than the remainder of the overlapping parts. This is illustrated in Fig. 9, which corresponds to Fig. 7 in other respects.
  • Fig. 10 illustrates another method of avoiding too many reinforcing rods at an intersection point.
  • the nets have been displaced so that at most three nets will meet at each intersection point, wherewith the number of rods in the intersection points will be the same as the number of rods in the remaining overlap regions, see the area within the circle 17.
  • the invention has been described above mainly with reference to asphalt road surfaces. However, as also mentioned in the introduction, the invention can also be applied to other surfaces that are coated with asphalt or some other plastic material.
  • the invention can also be applied to prevent cracks and joints in a concrete coating from penetrating up through a layer of asphalt laid thereon. In addition to preventing crack formations, the invention also contributes towards improving the bearing strength of the reinforced coating. It will be understood ' that modifications can be made within the scope of the following Claims. For instance, a net-edge net can be placed on both the underside and the upper side of a splice between adjacent reinforcement nets in the main reinforcement if this is found desirable in any demanding application.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Road Paving Structures (AREA)

Abstract

L'invention concerne un procédé de renforcement de revêtements présentant les propriétés de déformation du plastique tels que les revêtements en bitume. Ledit procédé consiste à juxtaposer des treillis de renforcement (2) constitués de barres assemblées ou l'équivalent en acier, en plastique ou en tout autre matériau rigide, avec des parties chevauchantes ou non, et à les insérer dans le matériau de revêtement (1). Afin d'empêcher la formation de fissures sur un bord du treillis de renforcement (2), on place un treillis à bords nets (8) le long de ce dernier, soit au-dessus soit au-dessous de celui-ci, et on l'insère dans le matériau de revêtement avec le treillis de renforcement. L'invention porte également sur un treillis de renforcement utilisé avec ledit procédé.
PCT/SE1994/001243 1993-12-23 1994-12-22 Procede de renforcement de revetements de chaussee presentant les proprietes de matieres plastiques et treillis de renforcement utilise avec celui-ci WO1995017553A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9304279A SE9304279L (sv) 1993-12-23 1993-12-23 Sätt vid armering av beläggningar av plastiska massor samt armeringsnät för användning därvid
SE9304279-4 1993-12-23

Publications (1)

Publication Number Publication Date
WO1995017553A1 true WO1995017553A1 (fr) 1995-06-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/001243 WO1995017553A1 (fr) 1993-12-23 1994-12-22 Procede de renforcement de revetements de chaussee presentant les proprietes de matieres plastiques et treillis de renforcement utilise avec celui-ci

Country Status (2)

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SE (1) SE9304279L (fr)
WO (1) WO1995017553A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053143A1 (fr) * 1998-04-15 1999-10-21 6D Solutions Structure rigide de renforcement et de solidarisation verticale de structures de roulement comme autoroutes ou ponts presentant des joints ou fissures
WO2002046532A1 (fr) * 2000-12-05 2002-06-13 Josef Ermer Dispositif servant a constituer et a consolider des terrains, notamment des routes
DE10044554C1 (de) * 2000-09-06 2002-08-08 Wilhelm Kaemereit Haltekonstruktion für Fahrbahndecken
WO2002075052A1 (fr) * 2001-03-15 2002-09-26 Densit A/S Structure de revetement semi-flexible renforcee
US20130316118A1 (en) * 2012-05-24 2013-11-28 The University Of Kentucky Research Foundation Structural reinforcement, reinforced structural member and related method
WO2017005392A1 (fr) * 2015-07-08 2017-01-12 Nv Bekaert Sa Renforcement routier avec zones de chevauchement marquées

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969645C (de) * 1953-10-23 1958-06-26 Baustahlgewebe Gmbh Bewehrungsanordnung fuer flaechenartige Stahlbetonbauteile
DE1759133A1 (de) * 1968-04-03 1971-06-03 Fritz Siegmeier Strassenbelag
CH558459A (de) * 1971-05-26 1975-01-31 Baustahlgewebe Gmbh Aus mehreren bewehrungsmatten gebildete bewehrungsanordnung.
US5152633A (en) * 1988-11-07 1992-10-06 Netlon Limited Method of reinforcing a paved surface

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969645C (de) * 1953-10-23 1958-06-26 Baustahlgewebe Gmbh Bewehrungsanordnung fuer flaechenartige Stahlbetonbauteile
DE1759133A1 (de) * 1968-04-03 1971-06-03 Fritz Siegmeier Strassenbelag
CH558459A (de) * 1971-05-26 1975-01-31 Baustahlgewebe Gmbh Aus mehreren bewehrungsmatten gebildete bewehrungsanordnung.
US5152633A (en) * 1988-11-07 1992-10-06 Netlon Limited Method of reinforcing a paved surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SVENSK VAGTIDNING, No. 3, issued 1993, CH. KRYLANDER, "Att Bemastra Sprickor I Asfalt", pages 16-17. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053143A1 (fr) * 1998-04-15 1999-10-21 6D Solutions Structure rigide de renforcement et de solidarisation verticale de structures de roulement comme autoroutes ou ponts presentant des joints ou fissures
FR2777577A1 (fr) * 1998-04-15 1999-10-22 6D Solutions Structure rigide de renforcement et de solidarisation verticale de structures de roulement comme autoroutes ou ponts presentant des joints ou fissures
DE10044554C1 (de) * 2000-09-06 2002-08-08 Wilhelm Kaemereit Haltekonstruktion für Fahrbahndecken
WO2002046532A1 (fr) * 2000-12-05 2002-06-13 Josef Ermer Dispositif servant a constituer et a consolider des terrains, notamment des routes
WO2002075052A1 (fr) * 2001-03-15 2002-09-26 Densit A/S Structure de revetement semi-flexible renforcee
US20130316118A1 (en) * 2012-05-24 2013-11-28 The University Of Kentucky Research Foundation Structural reinforcement, reinforced structural member and related method
US10655328B2 (en) * 2012-05-24 2020-05-19 The University Of Kentucky Research Foundation Structural reinforcement, reinforced structural member and related method
WO2017005392A1 (fr) * 2015-07-08 2017-01-12 Nv Bekaert Sa Renforcement routier avec zones de chevauchement marquées

Also Published As

Publication number Publication date
SE9304279L (sv) 1995-06-24
SE9304279D0 (sv) 1993-12-23

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