WO2008028463A1

WO2008028463A1 - Lowerable roadway demarcation

Info

Publication number: WO2008028463A1
Application number: PCT/DE2007/001554
Authority: WO
Inventors: Jürgen KERN
Original assignee: Maha Maschinenbau Haldenwang Gmbh & Co. Kg
Priority date: 2006-09-05
Filing date: 2007-08-30
Publication date: 2008-03-13
Also published as: DE102006041608A1; EP2126221A1

Abstract

The invention relates to a lowerable roadway demarcation comprising a guardrail (1) that extends in the longitudinal direction of the roadway, a channel-type pit (10) embodied within the roadway, and a supporting and lifting system (2) that moves the guardrail (1) between a driving-over position in which the guardrail (1) is lowered into the pit (10), to the level of the roadway, and a raised demarcation position. According to the invention, the guardrail (1) is fastened to a dimensionally stable longitudinal beam (4) which rests upon pivotable braces (24). Said braces (24) are pivotally mounted within lower footstep bearings (51) at the bottom of the pit (10). The lifting system (2) is provided with a driving element (40, 41) that acts in a substantially horizontal direction and is mechanically coupled to the braces (24) in order to raise and lower the longitudinal beam (4).

Description

Retractable roadway boundary

The invention relates to a retractable roadway boundary with a longitudinally extending in the roadway guardrail, formed in the roadway channel-like pit for receiving the guardrail and with a support and lifting system, which lowered the guardrail between a lowered in the pit in the driving level driving position and a raised Limit position moves.

CH-A-2346/01 discloses a lane boundary for multi-lane carriageways designed for installation in two-lane tunnels with the purpose of reducing the risk of serious traffic accidents as well as the causes of extreme fires in road tunnels. This known roadway boundary has a substantially horizontal profiled carrier extending continuously in the roadway longitudinal direction, which is mounted on dimensionally stable posts provided at predetermined intervals. With the help of these posts, the so-called guardrail-forming profile carrier can be moved from an upper traffic-moderately limiting normal position to a lower in-roadway over-travel position. In this lower override position, the entire multi-lane width of the road is available, eg for heavy-duty transports. The lifting system used in this known roadway limitation each contains a hydraulic lifting cylinder for each post, so that these posts are hydraulically raised and lowered together with the profile carrier. The cylinder housings of the lifting posts are inserted in counterbores of a continuous slot trench. To operate the hydraulic lifting cylinder arranged in a slot trench motor pump is used. A disadvantage of this known roadway limitation is the considerable technical effort, which is caused inter alia by the hydraulic units. Furthermore, the extended side members and the lifting system are sensitive to lateral shock loads, since the side rails forming the guard rails are supported only on the posts and connected to the piston of the hydraulic cylinder.

From CH-A-660 896 a roadway boundary is known having a two-part boundary beam supported by pivotal support posts. The support posts are hingedly connected at their upper ends to the barrier rail forming a guardrail and supported at their lower ends in a channel formed in the ground. As a lifting member are hydraulic cylinders which are articulated to the pivotable support post and pivot these posts for lifting the guardrail from an approximately horizontal position to a vertical position. Due to the articulation of the upper ends of the posts on the boundary bar or guardrail this is moved from its lowered position in a raised limit position. However, this lifting movement is superimposed on an undesired horizontal movement of the crash barriers. The object of the invention is to provide a retractable roadway boundary for multi-lane roads, which allows for technically little effort, even after long periods of reliable operation of the support and lifting system for raising and lowering the guardrail.

This object is achieved in that the guardrail is mounted on a dimensionally stable longitudinal member, the Längsträ- ger rests on pivotal struts, which are mounted in support bearings on the pit floor, and the lifting system has a substantially horizontally acting drive element, which for raising and lowering of the longitudinal member is mechanically coupled to the pivotable struts.

The roadway boundary according to the invention consists of a plurality of individual segments of respectively suitable length dimensions. The channel-like pit for receiving the support and lifting system has stable side walls and a bottom of pressure-resistant material, e.g. Concrete, up. At the upper corner regions of the side walls supporting elements are fixed, on which the dimensionally stable longitudinal member is firmly supported in its raised position in the roadway position.

An essential aspect of the invention is that the lifting system is arranged entirely within the pit and the dimensionally stable longitudinal member is part of a support structure which is received in the lowered position in the pit or rests on the base and in the raised position with sufficiently high strength supported by supporting elements so that the passing loads can be recorded. The side member, together with the guardrail mounted on the top, carries out purely vertical movements so that optimum space utilization is ensured.

According to a further aspect of the invention, the lifting system for raising and lowering of the longitudinal member includes a substantially horizontally acting drive element which is directly connected to a plurality of successively spaced with spacers struts or via intermediate links.

As a driving element, a Druckmittelzy cylinder with a sufficiently long stroke, a screw spindle operation, flexible tension cords or other suitable aggregates can be used, which also after long inactive periods, e.g. several months or years, can be reliably operated by simple measures. A particularly cost-effective and reliable way to raise and lower the side members is the use of flexible tension cords, which are connected at one end to a drive unit and possibly attack via deflecting rollers on the pivotable struts. The drive energy for the pivoting movements can provide a mobile or built in the pit winch.

The use of mobile winches, which are installed, for example, on road construction vehicles, is suitable for those applications in which the road boundary according to the invention is normally located in a raised limiting position with its crash barriers and only in rare special cases. len is moved to the lowered override position. This applies, for example, for those applications on motorways, in which the median strip of the highway is bounded by a guardrail. In such systems, the crash barriers are usually permanently installed. In order to enable a lane change over the median strip in special cases, gaps are provided between longer permanently installed guardrail sections, the od by simple locks, such as chains, gratings. The like. Be bridged. If, for example, in construction sites or in other operational situations from the one lane on the median stripe away on the other lane has to be changed, these simple locking elements are removed manually, but this is regularly associated with a considerable labor and personnel costs.

The road boundary according to the invention is particularly suitable for such applications in which the vehicles must be led from one lane to another lane.

According to an expedient embodiment of the invention, the continuous pit, in which the lifting system is accommodated, is bounded by two lateral concrete walls and a concrete base provided with seepage openings. The base may consist of more or less wide crossbars, which merge into the two side walls at the end. Advantageously, a pit element of up to 40 m in length, consisting of the two side walls and the base, manufactured as precast concrete and transported to the site. So that a high strength of the overall system against lateral impact loads is achieved in the raised boundary position, the supporting elements attached to the upper corner regions of the concrete side walls of the pit are expediently designed as profile rails. In the raised limiting state of the limiting system according to the invention, these profile rails form fixed abutments for the longitudinal member of the superstructure, which is permanently pressed against the stationary profiled rails. Suitably, each rail consists of an upper corner region of the concrete sidewall overlapping angle rail and a detachably attached to this first angle rail second angle rail. As a result, the second angle rail, which protrudes with its horizontal leg into the free space of the pit, be removed by loosening the respective connecting elements to remove the entire lifting system or its parts from the pit.

According to one essential aspect of the present invention, the longitudinal member is supported on a plurality of spaced with respective interspacing one behind the other in the pit arranged pivotable struts, which may be formed, for example, a frame-shaped. The lower ends of the frame-shaped struts can be connected to one another via a transverse spar rotatably mounted on the pit base. Instead of the transverse spar and a plurality of transverse pins may be provided which are rotatably mounted in stationary - upwardly open - support bearings. In the upright position, the struts are expedient slightly tilted over to prevent an arbitrary unwanted swinging back. Further expedient refinements of the invention are characterized by the provision of movable cover strips, which cover lateral gap spaces between the guard rail and the pit walls when the guard rail is lowered. Conveniently, these cover strips can be actuated by swivel bracket, weights or other suitable mechanisms, namely automatically with the lowering of a component of the lifting system.

In a further embodiment of the invention, the drive element for United pivot the frame-shaped struts at least one approximately horizontally in the pit longitudinally aligned Druckmittelzy- be linder whose stroke corresponds approximately to the pivot radius of the frame-shaped struts. The piston rod of this pressure medium cylinder is articulated with its free end to the nearest frame-shaped strut. Several pivotal struts are coupled together by push and pull rods for synchronous pivoting movements. The struts have expediently on their upper end sliding blocks or rollers as support elements for the longitudinal member.

In the following, embodiments of the invention will be described in detail with reference to the drawing. Show it:

1 shows a first embodiment of the roadway boundary according to the invention with raised guardrail in a schematic cross section.

FIG. 2 schematically shows the road boundary according to FIG. 1 with the guardrail lowered; FIG. Fig. 3, 4, the road boundary of Figure 1, 2 in partial longitudinal section with raised and lowered guardrail.

5 shows a further embodiment of the roadway boundary according to the invention in schematic cross section;

6, 6a show a further exemplary embodiment of the road boundary according to the invention with retracted guard rail in a schematic longitudinal section and in a schematic perspective view;

Fig. 7, 7a, the embodiment of Figure 6 with extended guardrail.

8 shows a detail of the embodiment according to FIGS. 6, 7 in a schematic perspective illustration;

9 shows an embodiment of the roadway boundary according to the invention in schematic cross section;

Fig. IO is a frame-like pivotable strut in a schematic perspective view;

Fig. 11 shows a further embodiment of the invention in a schematic cross section with raised and lowered guardrail.

In the embodiment of the mobile limiting system according to the invention shown in FIGS. 1 to 4, a guardrail 1 is mounted on a supporting structure. The guardrail 1 has vertical posts 3, which are fixed at predetermined longitudinal intervals on a dimensionally stable continuous side member 4 of a lifting system 2. In the illustrated embodiment, the longitudinal member 4 is a dimensionally stable optionally slightly profiled elongated steel plate. In this embodiment, the guard rail 1 mounted on both sides of the vertical post or support struts 3 lower and upper Hohlprofϊle 5, 6. In each case, two lower hollow profiles 5 are mounted vertically above one another on each side of the posts 3 by means of lever-shaped holders 7. These lower hollow profiles 5 have an approximately bow-shaped open on one side cross-section and a predetermined deformation behavior to absorb impact energy of a car can. The arranged on both sides at the upper end of the vertical support struts 3 upper hollow sections 6 have a rectangular profile and should according to their altitude collision loads collected by trucks.

The support structure and the lifting system 2 are located in a pit 10, which is formed by trough-shaped precast concrete segments 11. The longitudinal and transverse dimensions of these precast concrete segments 11 are chosen so that these segments can possibly be transported together with the pre-installed further system parts on normal sized commercial vehicles. Preferred lengths of the segments 11 are about 15 to 18 m, with two or more segments 11 can be installed one behind the other. As can be seen from FIGS. 3, 4, 11 seepage openings 16 are provided in the base 14 of the segments.

At the upper inner edges of the side walls 12, 13 of each segment 11 are brackets 17, 18 secured by screws or other elements that can extend throughout the entire length of the respective segment 11. With each of these angle rails 17, 18 each have a second angle rail 19, 20 fixedly connected to their respective vertical leg whose horizontal leg protrudes into the free space of the pit 10. The second win- Kelschienen 19, 20 are detachably connected to the outer angle rails 17, 18, for example by screws and can be disassembled by loosening the screw connections. The angle rail pairs 17, 19 and 18, 20 form dimensionally stable support elements for the longitudinal carrier located in its upper position 4. By a permanent pressure system in its two edge regions of the longitudinal member 4 is held tip over, even if high lateral impact loads, eg by abutting a vehicle , occur.

As can be seen in particular from FIGS. 1 and 3, in this exemplary embodiment the longitudinal member 4 is supported in the raised operating state on pivotable tipped-over struts, which each have two parallel support rods 24. The lower ends of these two support rods are attached to a cross member 25 which is rotatably supported in bearings 26 of the base 14. The upper ends of the two support rods 24 are connected by a transverse bar 27 with a round profile, which rolls on a pivoting movement of the struts on the underside of the dimensionally stable longitudinal member 4.

As shown in Figures 1 and 2, 11 two cover strips 29, 30 are arranged on the upper side of the side walls 12, 13 of the precast concrete segments, which can be moved transversely from the position shown in Fig. 1 in the covering position of FIG to cover clearances between the guardrail rails 6 and the side walls 12, 13 of the concrete segments when the superstructure 1 has been moved to the lowered position shown in FIG. For the transverse displacements of the two plate-shaped cover strips 29, 30 a special mechanism is provided here, which is actuated by the lowering movement of the lifting system 2 and a ne automatic transverse displacement of the two cover plates 29, 30 causes. For this purpose, in the illustrated embodiment swivel bracket 31, 32 are mounted in holders 33, 34 on the two side walls 12, 13 of the pit 10 pivotally. These swivel bars 31, 32 have a lower slightly bent portion 35, 36 and engage with their upper ends in drivers 37, 38, which are secured to the underside of the cover plates 29, 30. By a lowering movement of the longitudinal member 4 reach its side edges with the lower portions 35, 36 of the swivel bracket into engagement, causing a pivoting movement of these brackets 31, 32 from the position of FIG. 1 in the position of FIG. 2, in which the upper straight Sections of the two brackets have moved the cover strips 29, 30 in their covering position in each case inside.

The lifting system 2 of the illustrated embodiments contains as the actual lifting member at least one corrosion-resistant flexible tensile strand 40, which is shown here as a rope and on a arranged at the front end of the pit 10 drum 41 up and can be unwound. This tension cord 40 runs over a deflection roller 42 mounted in the end wall 15 to a further deflection roller 43 mounted on the dimensionally stable profile support 4 and from this to a further deflection pulley (not shown) at the rear end of the profile support 4 and to a fixed stop located at ground level. By winding the cable 40 on the drum 41 of the profile carrier 4 is raised from the lowered position shown in Fig. 4 in the upper position of FIG. The lowering of the profile carrier 4 is carried out by its own weight, 41 corresponding braking forces are applied to the winding drum to a to ensure slow uniform lowering of the overall construction.

Since in a variety of practical applications, the road boundary according to the invention is permanently in the raised limit position and only in the presence of special situations, such as a lane change after an accident, moved into the lowered over-travel position, the winding drum 41 can be coupled to the winch of a road vehicle. In this way, the provision of a separate drive unit for the winding drum 41 can be omitted, which has an advantageous effect on the investment costs and also on the maintenance.

The embodiment shown in Fig. 5 corresponds in its structural design to the embodiment of FIGS. 1 to 4, so that the same components are provided with the same reference numerals. Different is only the other type of guardrail, which is formed in the embodiment of FIG. 5 as a concrete forming rail 45 having a widened surfaces bounded by curved surfaces 46 and an upper rounded end portion 47.

Instead of the two longitudinal members shown, differently shaped guard rail elements can also be used on the lifting system designed according to the invention.

In the embodiment shown in Fig. 6 to 9 are identical to the embodiment of FIGS. 1 to 4 parts provided with the same reference numerals. Referring to Figures 6, 7, on the floor 14 of the concrete segment 11 there are a plurality of transverse relatively shallow sleepers 50 having front and rear slanted surfaces and a flat central surface. On these thresholds support bearings 51 are fixed, which consist of pairs of mutually associated bearing blocks 52. As can be seen from Fig. 8 each bearing block has an upwardly a V-shaped cutout 53, which merges into a lower semicircular part. In each case a bearing block pair 51 forms a pivotable support bearing for a stable cylindrical transverse pin 54, which is at the lower end of a support strut of a frame-shaped strut 55, for example by welding, attached. The frame-shaped strut 55 has two parallel profile struts 56, which are connected to one another in the lower region by a transverse iron 57. According to Fig. 8, the upper parts of the two support struts 56 are interconnected by a hinge rod 58 on which two pairs of push and pull rods 59, 60 are mounted. By a longitudinal movement of these push and pull rods 59, 60, the frame-shaped strut 55 is pivoted in its lower support bearing 51. At the upper ends of the two profile struts 56 sliding or rolling elements are arranged, on which the longitudinal member 4 rests.

As drive element serve in this embodiment in Fig. 6, 7 shown pressure cylinder or threaded spindle drives 63, the housing is hinged to a longitudinal member 4 bearing block 64 is hinged. The piston or spindle 65 of the drive element 63 articulates on the nearest brace 55. While in the embodiment of FIGS. 1 to 4, the gaps between the flat or longitudinal beams 4 and the channel walls 12, 13 of the segments 11 can be closed by transversely displaceable cover strips 29, 30 are in the embodiment of FIG. 11 instead of this Transversely slidable cover strips flaps 70 are used, which are connected via cables 71, each having a weight 72. In the extended state shown in Fig. I Ia, the flaps 70 are folded back and are automatically pivoted with the retraction of the guardrail 1 via the cables in the unfolded position shown in Fig. 11, in which they cover the gaps to the upper rail of the guardrail.

The invention is not limited to the illustrated embodiments. In particular, individual features shown in the various embodiments can also be used in other embodiments in a suitable combination.

Claims

claims

1. Retractable roadway boundary with

a guardrail (1) extending in the longitudinal direction of the roadway,

- A formed in the roadway channel-like pit (10) and

- A lifting and lifting system (2), which moves the guardrail (1) between a lowered in the pit (10) in the road level over-travel position and a raised limit position, characterized in that

- The guardrail (1) is mounted on a rigid support member (4), the longitudinal support rests on pivotal struts (24) which are mounted in support bearings (26, 50) on the pit bottom (14), and

- The support and lifting system (2) has a substantially horizontally acting drive element (41, 63) which is coupled for raising and lowering of the longitudinal member (4) with the struts (24, 55).

2. Lane boundary according to claim 1, characterized in that on the side walls (12, 13) of the pit (10) upper supporting elements (17-20) are fixed, on which the longitudinal beam is supported in its raised position in the roadway.

3. Lane boundary according to claim 1 or 2, characterized in that the drive element of the pivotable struts (24) comprises at least one flexible tension cord (40) which is connectable with one end to a winding drum (41).

4. roadway boundary according to claim 1 or 2, characterized in that at least one approximately horizontally in the pit (10) longitudinally aligned pressure medium cylinder or threaded gear (63).

5. Lane boundary according to one of the preceding claims, characterized in that a plurality of pivotable struts (55) by push and pull rods (59, 60) are coupled to each other for performing synchronous pivoting movements.

6. Lane boundary according to one of the preceding claims, characterized in that the pivotable struts (24, 55) are formed like a frame and at their upper ends sliding blocks or rollers (65) as support elements for the longitudinal member (4).

7. Fahrbahnbegrenzung according to claim 6, characterized in that the pivotable struts (55) have two parallel support rods (56) which are mounted in the stationary support bearing (51, 52) on the coarse bottom (14).

8. roadway boundary according to one of the preceding claims, characterized in that the pit (10) of two lateral concrete walls (12, 13) and a with seepage openings (16) provided concrete floor (14) is limited.

9. roadway boundary according to one of the preceding claims, characterized in that at the upper corner regions of the concrete side walls (12, 13) of the pit (10) fixed supporting elements (17-20) are Profϊlschienen.

10. Lane boundary according to claim 9, characterized in that each rail consists of an upper corner region of the concrete side wall (12, 13) overlapping angle rail (17, 18) and a releasably attached to this second angle rail (19, 20).

11. roadway boundary according to one of the preceding claims, characterized in that

Cover strips (29, 30, 70) are provided, the overlap with lowered guardrail (1) gap spaces to the pit walls (12, 13).

12. roadway boundary according to claim 11, characterized in that the cover strips (29, 30) are movable from their open position into the covering position by a mechanism (31, 32), this mechanism being actuatable by a lowering movement of the longitudinal member (4) of the lifting system.

13. roadway boundary according to claim 10 or 11, characterized in that the cover strips (29, 30) are transversely displaceable.

14. roadway boundary according to claim 10 or 11, characterized in that the cover strips (70) are designed as pivotable flaps on which weights (72) via pull cables (71) attack.