WO2007053040A1 - Breakaway base for road columns - Google Patents

Breakaway base for road columns Download PDF

Info

Publication number
WO2007053040A1
WO2007053040A1 PCT/NO2006/000399 NO2006000399W WO2007053040A1 WO 2007053040 A1 WO2007053040 A1 WO 2007053040A1 NO 2006000399 W NO2006000399 W NO 2006000399W WO 2007053040 A1 WO2007053040 A1 WO 2007053040A1
Authority
WO
WIPO (PCT)
Prior art keywords
base according
bolts
breakaway base
breakaway
rollers
Prior art date
Application number
PCT/NO2006/000399
Other languages
French (fr)
Inventor
Oddbjörn NES
Original Assignee
Örsta-Gruppen As
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 Örsta-Gruppen As filed Critical Örsta-Gruppen As
Priority to EP06812815.6A priority Critical patent/EP1948869B1/en
Priority to DK06812815.6T priority patent/DK1948869T3/en
Publication of WO2007053040A1 publication Critical patent/WO2007053040A1/en

Links

Classifications

    • 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
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
    • E01F9/631—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact
    • E01F9/635—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact by shearing or tearing, e.g. having weakened zones

Definitions

  • the invention relates to a breakaway base according to the introductory part of claim 1 , for road columns, particularly road columns for roads with high velocity and heavy traffic.
  • the main object of the invention is to ensure that the breakaway base releases even when a car impacts it at some distance from the base.
  • a further object is to provide a breakaway base which is not liable to siezing and decreasing breakaway function due to long service and weathering.
  • rollers particularly of metal can advantageously be used as friction reducing elements.
  • Multiple rollers are arranged between the dishes to reduce the friction, and the dishes having the friction reducing elements may be circular to arrange the rolls optimally along the edge, and make the dishes more resistant to bending of the edges.
  • the novel breakaway base has a short straight edge parallel to the road/direction of traffic, so rollers are perpendicular to the road and enhance the effect at a collision. Tests have also been conducted with rollers arranged parallel to the road, also giving reduced friction compared to prior art breakaway bases.
  • Figure 1 shows an exploded perspective view of an embodiment of the invention
  • Figure 2 show a cross sectione elevation view with an axial section of the socket with the breakaway base of Figure 1 ,
  • Figure 3 show a plan view of a sheet sheet according to the invention
  • Figure 4 shows an alternative spacer sheet with roller holders.
  • the main elements of Figure 1 are a road column 11 , a socket 12 provided for mounting on a fundament (not shown).
  • the road column 11 is manufactured of a conical or stepwise tapered steel tube 13 with a foot flange 14 welded on the lower end of the steel tube 13 with three supporting webs 15. For short road columns for low loads, the webs is may be omitted.
  • the flange 14 has a straight part 16 intended, in use, to be parallel to the road edge, and three notches 17 spaced 120° around the circumference. The notches 17 are intended to accomodate bolts 18 to be described in the following.
  • the flange 14 can also be a closed dish.
  • the socket 12 has a base dish 19, in the illustrated embodiment quadratic, with a bore hole 20 at each corner for fastening to a fundament not shown, e.g. of concrete, with imbedded bolts.
  • the base dish 19 carries a carrier plate 21 on a tubular collar 22, said parts being joined by welding.
  • the carrier plate 21 of this embodiment has a mating design of notches 23 as the foot flange and a corresponding flange design. This implies having a straight edge 24.
  • the nuts for fastening the bolts 18 are designated 25, while the nuts for fastening the base dish 19 have reference numeral 31.
  • rollers 26 Intermediate the foot flange 14 and the carrier plate 21 are embedded series of rollers 26 of steel or similar pressure resistant material.
  • the rollers 26 are arranged in openings 28 in an intermediate or spacer sheet 27 shown in Figure 3.
  • the rollers may have a diameter of 6 mm.
  • the intermediate sheet 27 is relatively thin, e.g. 0,7 mm, and is provided with holes 29 for the bolts 18.
  • the purpose of the intermediate sheet 27 is twofold,: 1) to keep the position of the bolts until the sideward load on the breakaway base exceeds a certain level, tearing off the intermediate sheet, and additionally 2) to keep the rollers 26 in place.
  • the rollers 26 can be replaced by balls of a hard material.
  • the design of the openings 28 and thus of the arrangement of the rollers 26, is shown in Figure 3.
  • the rollers 26 are arranged with the axis perpendicularly to the straight edge 30, which, when the intermediate sheet 27 is mounted, will be parallel to the road edge.
  • the friction reducing elements preferably are arranged in multiple groups, e.g. three groups, distributed over the face of contact.
  • FIG. 2 shows how the rollers 26 are clamped between the foot flange 14 and the carrier plate 21.
  • This embodiment has an annular socket 19 with a bevelled inner edge 32 joining a central collar 33.
  • the number of rollers is determined by the maximum bending torque, to avoid pressing of the rollers into the dishes or the rollers being deformed.
  • the rollers are fixed by wax or a glue sheet. This will make the mounting easier.
  • Road columns with breakaway base according to the invention are normally delivered factory mounted, to ensure proper mounting and right make up torque of the bolts.
  • Figure 4 shows an embodiment of an intermediate sheet 34 with rectangular openings 35 in a corresponding symmetrical arrangement as in Figure 3, for rollers 36. In this case groups of four rollers 36 are inserted in cassette frames or roller holders 37 arranged in the openings 35. This makes the transport of the rollers and the mounting of the rollers in the breakaway base easier and less demanding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Connection Of Plates (AREA)

Abstract

Breakaway base for road columns (11) , wherein a carrier plate (21) is mounted on a carrier (19) being anchored in the ground. The plate (21) is carrier for a foot flange (14) at the lower end of the column (11). The carrier plate (21) and the foot flange (14) being connected with at least two axially arranged fastening bolts (18) secured with nuts. At least one of the foot flange (14) and the carrier plate (21) has notches (17, 23) for the bolts (18) allowing the release of bolts at sideward impact. An element, particularly an intermediate sheet (27) with holes (29) for the fastening bolts, is arranged to keep the bolts (18) in place under normal use. Multiple friction reducing elements (26) are arranged to reduced the friction at sideward slip between said two parts.

Description

Breakaway base for road columns
The invention relates to a breakaway base according to the introductory part of claim 1 , for road columns, particularly road columns for roads with high velocity and heavy traffic.
Background
Road columns with a breakaway base (slip base) have been known for years. The brochure "Avskjasringsledd" published by Orsta Stalindustri January 1997, describes a breakway base with two triangular dishes bolted together. The breakaway base is clamped together with three bolts, one at each corner. The dishes have open slots instead of bores. This lets the upper dish and the column slide out of the bolts upon an impact, hence the term "slip base" Between the dishes is inserted a thin (0,7 mm) galvanized intermediate sheet or dish with a hole in each corner for the bolts. This is to avoid the bolts "working" out of the slots due to vibration if the bolts are not tightened. The bolts are easily broken out of the intermediate dish due to its thinness.
Columns with such a breakaway base have functioned well, but in some cases, the columns have not been released. Due to this, the authorities in some countries have turned negative to this prior art design. The reason for not releasing may have been due to a car impacting the road column at some height above th'e base, e.g. at an opening, when the road column is arranged on a downward slope. The friction of the breakaway base is relatively high, thus when a car impacts at some distance from the base, the bending moment increases at the base thereby increasing the friction. The tube of the road column lacks the strength to transfer the load necessary to release the breakaway base and the road column will break at the point of impact. There is also a risk that the breakaway base will sieze due to corrosion between the dishes.
Objects
The main object of the invention is to ensure that the breakaway base releases even when a car impacts it at some distance from the base. A further object is to provide a breakaway base which is not liable to siezing and decreasing breakaway function due to long service and weathering.
The Invention
The invention is stated in claim 1. Further features of the invention are stated in claims 2 - 8. With this breakaway base, the release of the breakaway base is ensured at an impact, also when the impact is at some distance from the base, when the base is located on a downward slope.
As stated in claim 2, rollers particularly of metal can advantageously be used as friction reducing elements. Multiple rollers are arranged between the dishes to reduce the friction, and the dishes having the friction reducing elements may be circular to arrange the rolls optimally along the edge, and make the dishes more resistant to bending of the edges.
The novel breakaway base has a short straight edge parallel to the road/direction of traffic, so rollers are perpendicular to the road and enhance the effect at a collision. Tests have also been conducted with rollers arranged parallel to the road, also giving reduced friction compared to prior art breakaway bases.
Further details of the invention will appear from the examples.
Examples
The invention is described more in detail with reference to the drawings, wherein
Figure 1 shows an exploded perspective view of an embodiment of the invention, Figure 2 show a cross sectione elevation view with an axial section of the socket with the breakaway base of Figure 1 ,
Figure 3 show a plan view of a sheet sheet according to the invention, and Figure 4 shows an alternative spacer sheet with roller holders.
The main elements of Figure 1 are a road column 11 , a socket 12 provided for mounting on a fundament (not shown). The road column 11 is manufactured of a conical or stepwise tapered steel tube 13 with a foot flange 14 welded on the lower end of the steel tube 13 with three supporting webs 15. For short road columns for low loads, the webs is may be omitted. The flange 14 has a straight part 16 intended, in use, to be parallel to the road edge, and three notches 17 spaced 120° around the circumference. The notches 17 are intended to accomodate bolts 18 to be described in the following. The flange 14 can also be a closed dish.
The socket 12 has a base dish 19, in the illustrated embodiment quadratic, with a bore hole 20 at each corner for fastening to a fundament not shown, e.g. of concrete, with imbedded bolts. The base dish 19 carries a carrier plate 21 on a tubular collar 22, said parts being joined by welding. The carrier plate 21 of this embodiment has a mating design of notches 23 as the foot flange and a corresponding flange design. This implies having a straight edge 24. The nuts for fastening the bolts 18 are designated 25, while the nuts for fastening the base dish 19 have reference numeral 31.
Intermediate the foot flange 14 and the carrier plate 21 are embedded series of rollers 26 of steel or similar pressure resistant material. The rollers 26 are arranged in openings 28 in an intermediate or spacer sheet 27 shown in Figure 3. The rollers may have a diameter of 6 mm.
The design of the arrangement of the rollers 26 shown in Figure 3 is particularly advantageous, but other arrangements can also be used.
As an alternative to the openings 28, slots accommodating multiple rollers can be used. The intermediate sheet 27 is relatively thin, e.g. 0,7 mm, and is provided with holes 29 for the bolts 18. The purpose of the intermediate sheet 27 is twofold,: 1) to keep the position of the bolts until the sideward load on the breakaway base exceeds a certain level, tearing off the intermediate sheet, and additionally 2) to keep the rollers 26 in place. The rollers 26 can be replaced by balls of a hard material.
The design of the openings 28 and thus of the arrangement of the rollers 26, is shown in Figure 3. The rollers 26 are arranged with the axis perpendicularly to the straight edge 30, which, when the intermediate sheet 27 is mounted, will be parallel to the road edge. The friction reducing elements preferably are arranged in multiple groups, e.g. three groups, distributed over the face of contact.
Figure 2 shows how the rollers 26 are clamped between the foot flange 14 and the carrier plate 21. This embodiment has an annular socket 19 with a bevelled inner edge 32 joining a central collar 33.
The number of rollers is determined by the maximum bending torque, to avoid pressing of the rollers into the dishes or the rollers being deformed. In the intermediate sheet 27, with the openings for the rollers, the rollers are fixed by wax or a glue sheet. This will make the mounting easier. Road columns with breakaway base according to the invention are normally delivered factory mounted, to ensure proper mounting and right make up torque of the bolts. Figure 4 shows an embodiment of an intermediate sheet 34 with rectangular openings 35 in a corresponding symmetrical arrangement as in Figure 3, for rollers 36. In this case groups of four rollers 36 are inserted in cassette frames or roller holders 37 arranged in the openings 35. This makes the transport of the rollers and the mounting of the rollers in the breakaway base easier and less demanding.

Claims

Claims
1. Breakaway base for road columns (11), wherein a carrier plate (21) is mounted on a carrier (19) being anchored in the ground, as carrier for a flange (14) at the lower end of the column (11), the carrier plate (21) and the foot flange (14) being connected with at least two axially arranged fastening bolts (18) secured with nuts, wherein at least one of the foot flange (14) and the carrier plate (21) has notches (17, 23) for the bolts (18) allowing the release of bolts (18) upon a sideway impact, and wherein an element, particularly an intermediate sheet (27) with holes (29) for the fastening bolts, is arranged to keep the bolts (18) in place under normal use, characterized in that multiple friction reducing elements (26) are arranged to reduce the friction at sideway slip between the two parts.
2. Breakaway base according to claim 1 , characterized in that the friction reducing elements are rollers (26), particularly of metal.
3. Breakaway base according to claim 2, characterized in that the rollers (26) are arranged with their axis perpendicularly to an adjoining road edge.
4. Breakaway base according to any one of claims 1 to 3, characterized in that the intermediate sheet (27) has opening (28) for the friction reducing elements (26).
5. Breakaway base according to claim 2 or 3, characterized in that the foot flange (14) and the carrier plate (21) are at least generally circular.
6. Breakaway base according to claim 5, characterized in that at least one of said elements (14, 21) has a straight part (16, 24) for arrangement parallel to the road edge
7. Breakaway base according to any one of claims 1 to 6, characterized in that the friction reducing elements are arranged in multiple groups distributed on the contact surface.
8. Breakaway base according to claim 4, characterized in that the intermediate sheet (27) is provided to keep the friction reducing elements during mounting.
9. Breakaway base according to any one of the claims 1 to 8, characterized in that it comprises roller holders (37) holding groups of rollers together during mounting and use.
10. Breakaway base according to claim 9, characterized in that the roller holders (37) are of frame structure, preferably with four rollers (36) in each.
PCT/NO2006/000399 2005-11-07 2006-11-07 Breakaway base for road columns WO2007053040A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06812815.6A EP1948869B1 (en) 2005-11-07 2006-11-07 Breakaway base for road columns
DK06812815.6T DK1948869T3 (en) 2005-11-07 2006-11-07 Bridal Base for vejpæle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20055220A NO325205B1 (en) 2005-11-07 2005-11-07 Road mast intersection joint
NO20055220 2005-11-07

Publications (1)

Publication Number Publication Date
WO2007053040A1 true WO2007053040A1 (en) 2007-05-10

Family

ID=35432914

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2006/000399 WO2007053040A1 (en) 2005-11-07 2006-11-07 Breakaway base for road columns

Country Status (4)

Country Link
EP (1) EP1948869B1 (en)
DK (1) DK1948869T3 (en)
NO (1) NO325205B1 (en)
WO (1) WO2007053040A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400445A (en) * 2010-09-08 2012-04-04 韩国建设技术研究院 Sliding base structure provided with clamping device
GB2509776A (en) * 2013-01-15 2014-07-16 Ritherdon & Company Ltd Roadside cabinet assembly
GB2621152A (en) * 2022-08-03 2024-02-07 Francis & Lewis International Ltd Stub bypass apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO339575B1 (en) * 2015-06-08 2017-01-09 Ferrozink Trondheim As Assembly for adjustable mounting of post, beam or similar to foundation.
NO343828B1 (en) * 2016-06-14 2019-06-17 K Manger Konsulenttjenester As An adjustment device for a post foundation that shall be inserted into the ground, method for adjusting the position of a post connected to an adjustment device, and the use of said adjustment device.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926592A (en) * 1989-02-10 1990-05-22 Unistrut International Corp. Breakaway sign post coupling
US20020122693A1 (en) * 2000-12-29 2002-09-05 Northwest Pipe Company Breakaway post slipbase
US6540196B1 (en) * 2002-02-06 2003-04-01 Western Highway Products, Inc. Break away support structure coupling
US20030205006A1 (en) * 2002-05-01 2003-11-06 Conner Michael D. Breakaway post base

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926592A (en) * 1989-02-10 1990-05-22 Unistrut International Corp. Breakaway sign post coupling
US20020122693A1 (en) * 2000-12-29 2002-09-05 Northwest Pipe Company Breakaway post slipbase
US6540196B1 (en) * 2002-02-06 2003-04-01 Western Highway Products, Inc. Break away support structure coupling
US20030205006A1 (en) * 2002-05-01 2003-11-06 Conner Michael D. Breakaway post base

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1948869A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400445A (en) * 2010-09-08 2012-04-04 韩国建设技术研究院 Sliding base structure provided with clamping device
GB2509776A (en) * 2013-01-15 2014-07-16 Ritherdon & Company Ltd Roadside cabinet assembly
GB2509776B (en) * 2013-01-15 2020-07-08 Ritherdon & Company Ltd Passively safe roadside cabinet
GB2621152A (en) * 2022-08-03 2024-02-07 Francis & Lewis International Ltd Stub bypass apparatus

Also Published As

Publication number Publication date
NO325205B1 (en) 2008-02-25
EP1948869B1 (en) 2016-04-06
EP1948869A1 (en) 2008-07-30
EP1948869A4 (en) 2014-05-07
NO20055220D0 (en) 2005-11-07
DK1948869T3 (en) 2016-07-04

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