EP0758427B1 - Profilierter zaunpfahl aus polymermaterial - Google Patents

Profilierter zaunpfahl aus polymermaterial Download PDF

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Publication number
EP0758427B1
EP0758427B1 EP95917247A EP95917247A EP0758427B1 EP 0758427 B1 EP0758427 B1 EP 0758427B1 EP 95917247 A EP95917247 A EP 95917247A EP 95917247 A EP95917247 A EP 95917247A EP 0758427 B1 EP0758427 B1 EP 0758427B1
Authority
EP
European Patent Office
Prior art keywords
wires
post
reinforcement
polymer material
fence post
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP95917247A
Other languages
English (en)
French (fr)
Other versions
EP0758427A1 (de
Inventor
Marnix Allegaert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Publication of EP0758427A1 publication Critical patent/EP0758427A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/02—Wire fencing, e.g. made of wire mesh
    • E04H17/06—Parts for wire fences

Definitions

  • the invention relates to a profiled fence post, made of polymer material, reinforced with a number of continuous steel reinforcement wires running in the longitudinal direction from one end to the other, which have a diameter ranging between 1.5 and 5 mm and which are embedded in adherent relationship in said polymer material.
  • Such posts are implanted in the ground, and when a transverse force is exerted on the post, specifically the location where the post emerges from the ground is subject to a large bending moment.
  • the posts are usually tubular, or, in general: profiled. This means that the surface area of the useful cross-section (cross-section of the material) is maximally 30% of the surface area of the smallest possible circumscribed convex figure, as is the case with most tubular shapes, L-profiles, T-profiles and I-profiles, oriented in accordance with the anticipated direction of the transverse forces.
  • a convex figure must have an equivalent diameter - i.e.
  • the diameter of the circle having the same surface area -ranging between 2 and 25 cm, and usually between 3 and 12 cm.
  • tubular fence posts are already known, for example, from Dutch patent application no. 8600065.
  • the post is reinforced with a number of continuous steel reinforcement wires running in the longitudinal direction from one end to the other, these wires having a diameter of around 3 mm and may be embedded in adherent relationship in said polymer material.
  • the invention will be used for posts in which the reinforcement wires have a thickness ranging between 1.5 and 5 mm, and preferably between 2 and 4 mm.
  • the polymer material for such a post will in general be a hard PVC or a copolymer of PVC with another monomer, such as vinyl acetate, or a polypropylene or HD-polyethylene.
  • Such tubes are produced by means of an extrusion process in which the reinforcement wires are fed in the direction of the extrusion towards the entrance of the extrusion machine.
  • the reinforcement wires due to chemical and/or mechanical adhesion, the reinforcement wires of themselves already adhere firmly enough to the polymer material, and/or the wires exhibit sufficient surface irregularities or roughness for the adhesion, then, upon being fed into the extrusion machine, the wires do not need to be coated with a special adhesive layer, a so-called "primer".
  • a primer a well-known manufacturing technique for plasticized wires.
  • said reinforcement wires have an oil-hardened and tempered martensitic structure and an elastic limit of at least 1200 N/mm 2
  • the idea underlying the invention relates to the fact that, up till now, efforts to improve the bending strength have always focused on making the reinforcement wires adhere better in the polymer material, so that these wires would be better able to take over the tensile forces from the polymer material. But herein the fact was overlooked, that, when bending such a post, the conventional force distribution pattern does not apply, in which over the cross-section of the post there would only be a tensile zone, a pressure zone and a neutral line between the two. Upon bending indeed, the polymer material between the wires is subject to great shearing stresses in the longitudinal direction.
  • these posts can be bent surprisingly far without leaving a permanent crease. They can in fact be bent far beyond the elastic limit of the relatively soft polymer material, so that the latter indeed shows a plastic deformation. But at this point, the reinforcement wires have not yet reached their elastic limit: neither in flexure, nor, for the wires that are located far from the conventional neutral line, in tension or pressure.
  • the post is released, all the wires seek to recover both their original straightness and their original length. And thanks to their great stiffness, combined with the good adhesion, they will draw the polymer material along in this movement and hence deform it in the opposite sense back into the original straight condition of the wires and post.
  • each element in addition to having a normal resistance to tension or pressure, would also be able to offer a large resistance against bending in the expected direction.
  • each individual reinforcement element even when it is advantageous for each individual reinforcement element to consist of one single stiff wire, this still does not mean that the entire reinforcement for the entire useful cross-section of the post must be concentrated in one single very thick reinforcement element, or in a very small number of such elements.
  • a certain even distribution of the reinforcement steel is necessary, i.e. over different elements spread over the cross-section.
  • each element develops its own pressure and tensile zone (including a neutral line) around itself in the polymer material. And the lesser the number of elements over which this reinforcement steel is distributed, the further these zones will extend. Upon bending, then, the parts that lie too far from such a neutral line can start to flow too soon and exhibit an excessive and irreversible plastic deformation.
  • the distribution to be utilized will depend on the geometry. Thus, it will be aimed at achieving a greater density in the parts of the cross-section of the material which are located further from the conventional neutral line than those parts in the center. These parts lying further out will participate to a greater extent in the development of the bending strength due to the fact that their tensile or pressure resistance is better utilized.
  • a tubular form in which the reinforcement wires are uniformly distributed over the perimeter of the tube wall is a preferred embodiment of the invention.
  • reinforcement percentage means: the percentage of steel surface area compared to the total surface area of the transected material in the cross-section of the post.
  • the reinforcement wires can be improved, in accordance with the invention, by ensuring that the elastic limit of the steel is at least 1200 N/mm 2 , and preferably more than 1400 N/mm 2 .
  • the so-called “0.2 limit” is meant. Since the "beginning" of the flowing is difficult to observe, in most standard tests this beginning is defined as the situation in which an elongation of 0.2% is reached. In order to obtain such a high elastic limit, it is necessary to harden the wire.
  • wire with the final diameter is continuously led through a continuous furnace where it is heated to austenitization temperature, and then upon exit from the continuous furnace it runs through an oil bath where it is quenched and thus obtains a hard martensitic structure, and thereupon is fed through a heating element where said structure is softened to a certain extent because the pure quenched structure is too brittle.
  • a good straight wire is thus obtained for use in the extrusion of the post.
  • Figure 1 shows a post in the shape of a round tube 1 with an even wall thickness.
  • 3 is a reinforcement wire.
  • the broken line 2 represents a fence wire mesh which is attached to the post.
  • the shape of the tube may however only be essentially round, which means that at certain locations, it deviates from the round shape, as for example the locations 4 where a fence wire mesh will be attached with a snap connection ( Figure 2).
  • the wall thickness does not necessarily need to be the same everywhere. Thus it can vary, and the wall can display local thickenings for the purpose of providing space for the reinforcement wires when they are relatively thick in relation to the average wall thickness (Figure 3).
  • the tube can also be square or rectangular.
  • the average wall thickness over the circumference will generally lie in the range between 3 and 15% of the diameter or equivalent diameter of the post, and preferably between 5 and 10%.
  • the selected number of wires will preferably be distributed as uniformly as possible around the circumference of the tube wall.
  • the strictly uniform distribution Figure 2, the reinforcement wires 5 and 6
  • the distribution is only substantially uniform.
  • the wires shall however not be distributed over too small a number of reinforcement wires, for reasons which have already been presented above, nor over too large a number of reinforcement wires, because then the wires will be thinner and less stiff. A distribution over a minimum of 4 and a maximum of 30 wires is therefore most suitable.
  • Deviations from a strictly uniform distribution are also possible when one wants the post to offer more resistance against transverse forces in the plane perpendicular to the fence. it is then taken into account that part of the force distribution pattern is still the standard pattern over the entire cross-section, with a pressure zone, a tensile zone and a neutral line running parallel with the fence. A distribution is therefore used which involves a greater concentration of wires far from the neutral line.
  • Figure 4 in which the broken line 6 represents the neutral line and the broken line 2 once again represents a fence mesh.
  • a different post profile can also be chosen, for example an I-profile, with the reinforcement wires more concentrated far from the neutral line ( Figure 5).

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wire Processing (AREA)
  • Fencing (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Piles And Underground Anchors (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Ropes Or Cables (AREA)

Claims (4)

  1. Profilierter Zaunpfahl (1) aus Polymermaterial, das durch eine Anzahl kontinuierlicher Stahlverstärkungsdrähte (3) verstärkt ist, die in der Längsrichtung von einem Ende zum anderen verlaufen, welche einen Durchmesser im Bereich zwischen 1,5 und 5 mm haben und welche in Haftbeziehung in das Polymermaterial eingebettet sind, dadurch gekennzeichnet, dass die Verstärkungsdrähte (3) eine ölgehärtete und getemperte Martensitstruktur und eine Elastizitätsgrenze von wenigstens 1200 N/mm2 haben.
  2. Zaunpfahl (1) gemäß Anspruch 1, dadurch gekennzeichnet, dass die Verstärkungsdrähte (3) eine Elastizitätsgrenze von mehr als 1400 N/mm2 haben.
  3. Zaunpfahl (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Pfahl einen Verstärkungsprozentsatz im Bereich zwischen 4 und 20 % hat.
  4. Zaunpfahl (1) gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Pfahl (1) rohrförmig ist, wobei eine begrenzte Zahl von Verstärkungsdrähten (3), zwischen 4 und 30 und mit einem Durchmesser im Bereich zwischen 2 und 4 mm, im Wesentlichen gleichförmig über die Rohrwand verteilt sind.
EP95917247A 1994-05-04 1995-05-03 Profilierter zaunpfahl aus polymermaterial Expired - Lifetime EP0758427B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9400465 1994-05-04
BE9400465A BE1008449A3 (nl) 1994-05-04 1994-05-04 Geprofileerde afsluitingspaal uit kunststof.
PCT/BE1995/000044 WO1995030815A1 (en) 1994-05-04 1995-05-03 Profiled fence post made of polymer material

Publications (2)

Publication Number Publication Date
EP0758427A1 EP0758427A1 (de) 1997-02-19
EP0758427B1 true EP0758427B1 (de) 2001-07-11

Family

ID=3888142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95917247A Expired - Lifetime EP0758427B1 (de) 1994-05-04 1995-05-03 Profilierter zaunpfahl aus polymermaterial

Country Status (9)

Country Link
EP (1) EP0758427B1 (de)
AT (1) ATE203084T1 (de)
BE (1) BE1008449A3 (de)
CA (1) CA2189228A1 (de)
DE (1) DE69521695T2 (de)
ES (1) ES2161287T3 (de)
MX (1) MX9605310A (de)
PT (1) PT758427E (de)
WO (1) WO1995030815A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9328208B2 (en) 2010-05-18 2016-05-03 Nv Bekaert Sa PVC reinforced composites

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2273143A1 (en) * 1974-05-31 1975-12-26 Thevenin Jean Marie Extruded plastic cruciform section fence post - with reinforcement in each arm and adjustable fixing of wire
NL8600065A (nl) * 1986-01-14 1987-08-03 Bekaert Sa Nv Kunststofpaal en bevestigingsklem voor het vastzetten van afsluitingsmateriaal tegen deze paal.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9328208B2 (en) 2010-05-18 2016-05-03 Nv Bekaert Sa PVC reinforced composites

Also Published As

Publication number Publication date
MX9605310A (es) 1997-12-31
DE69521695D1 (de) 2001-08-16
WO1995030815A1 (en) 1995-11-16
EP0758427A1 (de) 1997-02-19
BE1008449A3 (nl) 1996-05-07
CA2189228A1 (en) 1995-11-16
PT758427E (pt) 2002-01-30
ATE203084T1 (de) 2001-07-15
DE69521695T2 (de) 2001-10-25
ES2161287T3 (es) 2001-12-01

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