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
  • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
  • E01F15/02—Continuous barriers extending along roads or between traffic lanes
  • E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
  • E01F15/0476—Foundations
• • 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
  • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
  • E01F15/02—Continuous barriers extending along roads or between traffic lanes
  • E01F15/08—Continuous barriers extending along roads or between traffic lanes essentially made of walls or wall-like elements ; Cable-linked blocks
  • E01F15/081—Continuous barriers extending along roads or between traffic lanes essentially made of walls or wall-like elements ; Cable-linked blocks characterised by the use of a specific material
  • E01F15/083—Continuous barriers extending along roads or between traffic lanes essentially made of walls or wall-like elements ; Cable-linked blocks characterised by the use of a specific material using concrete
• • 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
  • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
  • E01F15/02—Continuous barriers extending along roads or between traffic lanes
  • E01F15/08—Continuous barriers extending along roads or between traffic lanes essentially made of walls or wall-like elements ; Cable-linked blocks
  • E01F15/088—Details of element connection

Definitions

• the present invention relates to a New Jersey barrier forming a traffic divider made of concrete, and more particularly it relates to such a barrier having improved safety properties compared to barriers used nowadays .
• This class corresponds to a more restrictive regulation as compared to the prerequisites satisfied by barriers used before and belonging to the same category.
• Another object of the present invention is to improve the connection between the various concrete modules which form the barrier, so as to increase the absorbed collision energy (homologat ion in the class B3 ) and reduce at the same time the lateral displacements.
• Fig.l is a cross secional view of the barrier along the line A-A of Fig.2, according to a first embodiment of the invention
• Fig.2 is a longitudinal cross sectional view, along line B-B of Fig.l;
• Fig.3 is a cross sectional view of the barrier corresponding to Fig.l, wherein the cross section is taken however at the center of the module;
• Fig.4 is a plan view of a first type of steel plate forming part of the connection device, for the junction heads between two adjacent barriers;
• Fig.5 is a view of the plate of Fig.4 in the direction of the arrow C;
• Fig.6 is a cross sectional view along line D-D of Fig.4;
• Fig.7 is a plan view of a second type of steel plate to be mounted on the center of the module or in another position on the latter;
• Fig.8 is a side view along the arrow E of Fig.7;
• Fig.9 is a sectional view along the line F-F of Fig.7;
• Fig.10 is a side view of a second embodiment of the barrier
• Fig.11 is a plan view of Fig.10;
• Figs. 12a-12d are sectional views respectively taken along the lines G-G, H-H, and L-L of Fig. 10;
• Fig.13 shows the horizontal section of the junction between two concrete modules, taken along the foot (toe) of the barrier;
• Fig.14 is a plan view of the junction between two modules ;
• Fig.15 is a perspective view of a detail of the anchor system for connecting the barrier to the ground, pavement or curb;
• Fig.16 is a cross sectional view of a barrier corresponding to a third possible embodiment, taken at a point distant from the upright of the handrail and from the anchor means, which are also part of the invention;
• Fig.17 is a cross section similar to Fig.16, taken along the upright of the handrail;
• Fig.18 is a cross section similar to Fig.17, before assembling of the handrail;
• Figs. 19, 20 are views analogous to Figs. 16, 17, however with a different assembling system for the handrai 1 ;
• Fig. 21 is a view along line N-N of Fig. 21.
• number 1 denotes a concrete New Jersey barrier.
• the barrier 1 is a traffic divider, that is it is interposed between two parallel carriageways.
• the barrier 1 is supported by the curb 2 or directly by the pavement .
• a plate of the first kind 3 is arranged below the barrier 1, in a recess provided according to the invention, on the lower surface of the modules 1', 1", in such a way that the lower surface of the plate 3 is flush (at the same level) with the remaining lower surface of the modules 1', 1", not covered by the plate 3.
• the recess will be oversized compared to the plate 3, allowing an easy assembling of the plate of the first kind 3.
• the lateral walls 4,4' of the plate 3 are received into the opposite lateral cavities or recesses 5, 5' provided on the modules 1', 1" of the barrier 1 at the junction 6.
• the lateral vertical walls 4,4' of the plate 3 of the first kind have two holes 7a, 7b, wherein the two opposite holes 7a are used to insert a cross bolt 8a, whereas the two opposite holes 7b of the plate 3, are used to insert a second cross bolt 8b.
• the bolt 8a passes through the end of the module 1", whereas the other bolt 8b passes through the other module 1'.
• the bolts 8a, 8b are introduced into through holes which already exist in the conventional barriers, but in the latter barriers the connection is effected by means of two separate lateral plates, whose role is now played, according to the present invention, by the lateral walls 4,4' integral with the bottom 9 of the plate of the first kind 3. In this way the connection is more rigid and the play between the parts is reduced.
• the plate 3 has two lateral extensions 10,10' which in this embodiment are rectangular and which are provided with slots 11, 11'.
• a washer 13 is put on the plate 3, on the slots 11, 11', and a nut 14 is screwed at the upper end of each vertical rod 12.
• these nuts 14 are left slack, that is they are not screwed tight against the washer 14 and the plate 3; this is done in order to ensure the correct operation of the barrier forming the traffic divider, as explained hereinafter.
• the barrier 1 moves backwards, until the vertical rod 12 abuts on the edge of the slot 11 or 11', that is the plate 3; at this moment, the vertical rod 12 breaks under the shearing stress, after having absorbed a certain amount of energy, and the barrier may move further backwards.
• the present invention therefore proposes to use a plate 3 which has several functions:
• the conventional concrete barrier has a central trapezoidal cavity 20 extending almost to the junction (see Fig. 2). This cavity 20 receives the nuts 14 of the vertical rods 12.
• the vertical rod 12 which may be longer in this case, must be inserted in a rigid device allowing however its impact failure under a shearing stress.
• FIGS 7, 8, 9 show a steel plate of the second kind 21.
• the steel plate of the second kind 21 has a central slot 22 on its bottom 23 and two lateral walls 24,24', each of them having a pair of holes 25a, 25b. It is also received in a recess on the lower surface of the barrier, as in the case of the plate of the first kind 3. The depth of the recess exceeds the thickness of the bottom 23.
• This plate 21 is preferably assembled at the middle of a module of the barrier 1 and is used as an additional anchor means of the barrier (Fig.3). Since concrete barriers 1 used nowadays as traffic dividers do not have any recesses 5,5' on the middle portion of a module, the length 1 of the plates of the
• a vertical anchor bar 40 is introduced into the central slot 22 of the plate of the second kind 21, and is embedded in the concrete of the curb 2.
• the nut 50 is screwed on the upper end of the vertical rod 40, but it is not screwed tight against the washer 51 which lays on the bottom 23 of the plate 21 of the second kind.
• the bar 40 has a predetermined resistance against breaking caused by impacts.
• two different plates of the second kind 21 may be mounted on the same module, each one at a distance of (6,20/3) metres from the corresponding junct ion.
• the barrier consists of different modules 1 ' ' ' , like the one shown in figs. 10 and 11, comprising a male head 60' and a female head 60.
• this barrier is not formed with an inner trapezoidal cavity, but it is solid (see Figs. 12a to 12d) and has a specific weight > 2,7 kg/dm(3). Moreover, its height is > 1 , and preferably it varies between 1 and 1,05 m.
• the increased weight of the barrier produces shorter lateral displacements during the collision, due to friction between the concrete and, for instance, the bituminous conglomerate.
• Fig. 12b which is a cross section along line H-H of Fig. 10
• recesses 62 at the foot (toe) of the barrier, which are alternately formed on one or the other side of the module 1 ' ' ' .
• an anchor system like the one shown in Fig.15, formed by a steel box-like element 63, comprising an upper plate portion 64 and a lower plate portion 65.
• the lines 66, 66 ' are the steel reinforcements of the concrete material forming the module 1''', at the recess region 62.
• Vertical rods with a helical end are introduced into the ground or in a previously realized bore obtained in the bituminous conglomerate of the support 2, in case the latter is made of a bituminous conglomerate.
• the helical end allows a stable connection to the ground or the bituminous mix, in general to the support 2; moreover, these vertical rods (not shown) are provided at their upper end with a nut which will be received in the box- like element 63, which is arranged in the recess 62.
• the nut will be located at the center of the box 63, and the barrier will be allowed to move almost freely (some centimetres) backwards, during the impact, before the nut abuts the walls of the box 63, thereby permitting energy absorption by the vertical rod (whose function is the same as that of the bars 12) and its subsequent possible breaking caused by the shearing stress.
• the way the vertical bar is anchored to the support 2 may be of any kind known to a skilled person. For instance, it is possible to employ a resin contained inside a cartridge, so that when the latter breaks the resin can harden; etc.
• Fig. 14 shows how the connection is performed using a screw coupling 74.
• bars 71 having a diameter of about 28 mm are employed, which is greater than that of conventional bars of this kind.
• a handrail fixed by means of montesi bars or the like 85 employs a handrail fixed by means of montesi bars or the like 85.
• the barrier has no central trapezoidal cavity, that is it is solid.
• the specific weight is > 2.7 kg/dm(3).
• the barrier height is in this case approximately equal to lm, and that of the handrail can be 35 cm, for example.
• the handrail 80 is provided for the purpose of preventing a vehicle with a center of gravity located at a height of 1,60 m, from "getting over" the barrier.
• Figs. 19-21 show an alternative way of fixing the handrai 1.
• a montesi bar is introduced in the hole 90 shown in Fig. 18.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
• Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
• Road Signs Or Road Markings (AREA)
• Road Paving Structures (AREA)
• Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11404502

Family Applications (1)

Country Status (6)

Cited By (20)

Citations (4)

• 1996
  • 1996-10-31 IT IT96RM000744 patent/IT1286368B1/it active IP Right Grant
• 1997
  • 1997-07-30 EP EP97935760A patent/EP0951605B1/de not_active Expired - Lifetime
  • 1997-07-30 DE DE69711701T patent/DE69711701T2/de not_active Expired - Lifetime
  • 1997-07-30 AU AU38636/97A patent/AU3863697A/en not_active Abandoned
  • 1997-07-30 ES ES97935760T patent/ES2175447T3/es not_active Expired - Lifetime
  • 1997-07-30 WO PCT/IT1997/000196 patent/WO1998019015A1/en active IP Right Grant

Patent Citations (4)

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