Milling device for road shoulders

Abstract

Milling device (20) with laterally discharging conveying device for milling a shoulder area (16) adjoining laterally a road body (10), characterized in that the milling device (20) can be attached as an attachment device to an existing carrier device (22).

Description

[0001] The present invention relates to a milling device for road shoulders.

[0002] According to current procedures for the upkeep, care and maintenance of paved roads and paths, not only the road surfaces themselves must be taken into account, but the lateral edges formed by the road shoulders must also be included in the care and maintenance measures.

[0003] These road shoulders are an unpaved part of the road, usually covered with turf, which is directly connected to the carriageway, verge or side paths on both sides and which serves to absorb the lateral pressure when driving on the road, to support the paved parts of the road and to drain the surface water.

[0004] When maintaining road surfaces by milling and removing worn surface material, the road shoulders are inevitably partially reworked, which means that the shoulder surfaces are partially removed. Depending on local or regional legal regulations, the resulting volumes of milled material may not be indiscriminately mixed with the milled material from the actual roadway. For example, legal requirements stipulate that some shoulder material generated during the construction and rehabilitation of state and federal roads and highways must be treated as hazardous waste due to excessive pollution. This hazardous waste must then be disposed of separately and / or landfilled, which usually involves considerable expense.

[0005] In March 2010, a General Circular on Road Construction No. 04 / 2010 of Department 10.1, concerning road maintenance services, of the German Federal Ministry of Transport, Building and Urban Development, referred to a guideline on the handling of verge peelings (reference number: StB 16 / 7243.7 / 10-10-10 / 1171543), which stipulates the same.

[0006] When a new asphalt surface is laid and the worn-out old surface is removed with an asphalt milling machine, it often happens that the milling machine gets into the organic shoulder material and mixes this material, at least to some extent, with the asphalt millings. When this happens, the mixed volume of milled-off material can no longer be recycled and thus subjected to sensible and, above all, resource-efficient reuse.

[0007] According to the current state of the art, this material is excavated with an excavator, transported by truck to a mobile facility, processed there, and transported back to be reused as base material for the newly constructed road shoulders and installed there. However, this process inevitably involves high energy consumption and thus leads to undesirable CO2 emissions.

[0008] In view of the known state of the art, a primary object of the invention can be seen in providing a remedy for this unfavorable situation in order to reduce unnecessary energy consumption and undesirable CO2 emissions.

[0009] The above object is achieved by the subject matter of the independent claim. Further advantageous embodiments are described in the subclaims.

[0010] The present invention proposes leaving the existing material on the construction site so that it can subsequently be reused to construct the shoulder, which is part of the lateral structure of the roadway. Existing legal regulations stipulate that this milled material, which includes both milled road and shoulder material, may only be stored at a maximum distance of five meters from the existing roadway.

[0011] Thus, it can be considered a central element of the present invention to provide a device as an attachment, which device can be attached to any practicing road construction company, in particular to existing wheel loaders or similar self-propelled work machines, which can advantageously be done via a quick-change device in order to enable rapid attachment and removal.

[0012] The device according to the invention can, for example, be mounted on a laterally movable frame so that the carrier device travels on the existing road and the milling machine operates only in the shoulder area. A rotating milling wheel equipped with suitable milling tools can preferably be arranged in the housing of the device. The milling tools can, in particular, be formed by hard metal chisels arranged circumferentially on the milling wheel. The milling shaft on which the milling wheel is mounted is driven, for example, by a hydraulic motor, which can advantageously be controlled and supplied with drive energy via the existing auxiliary hydraulics of the carrier device.

[0013] The rapid rotation of the milling shaft and the milling wheel mounted on it, with its circumferentially arranged milling tools, simultaneously crushes the removed material and conveys it into a housing via the milling motor. A hydraulically driven screw conveyor rotates within this housing, conveying the material outward at a right angle to the milling shaft and depositing it there. The feed rate can be adjusted via an electrically controlled directional valve. This allows for continuous control of the material flow.

[0014] The following explanations summarize some aspects of the invention, which has already been explained in various embodiments, and specify some aspects. However, they should not be viewed as contradicting the explanations already made, but rather as a summary, and in case of doubt, as more specific embodiments and / or modifications. Thus, the milling device according to the invention can, in particular, be equipped with a laterally discharging conveyor device for milling a lateral road surface. The milling device can preferably be mounted as an attachment to an existing carrier device.

[0015] In addition, a hydraulically driven shaft with a milling wheel mounted on it can rotate in the milling device, preferably within a housing, which crushes the material and throws it horizontally over the shaft in the opposite direction of travel.

[0016] This hydraulically driven rotating shaft can carry a milling wheel, which can preferably be equipped on the outside with milling tools, in particular those made of hard metal.

[0017] Furthermore, the milling device according to the invention can be characterized in that the milled material is conveyed into an open housing and deposited laterally via a discharge auger which is hydraulically driven at a right angle to the milling shaft.

[0018] The hydraulic motors of the milling device according to the invention can in particular be adjusted proportionally in terms of speed.

[0019] Finally, the milling device can have a displacement device operated by a hydraulic cylinder so that it can be displaced laterally transversely to the roadway.

[0020] In the following, exemplary embodiments will explain the invention and its advantages in more detail with reference to the accompanying figures. The relative sizes of the individual elements in the figures do not always correspond to the actual sizes, as some shapes are simplified and others are enlarged relative to other elements for better illustration. Fig. 1 shows an example road structure with shoulders on both long sides of a road. Fig. 2 shows a schematic detailed view of an embodiment variant of a milling device according to the invention, which is attached to a carrier device by means of a quick-change device. Fig. 3 shows a schematic plan view of the milling device according to Fig. 2. Fig. 4 shows a schematic side view of the milling device according to Fig. 2 and pursuant to Fig. 3.

[0021] For identical or similarly functioning elements of the invention, the following description of the figures generally uses the same reference numerals. Furthermore, for the sake of clarity, in many cases only those reference numerals are used in the individual figures that are necessary for the description of the respective figure. The illustrated embodiments merely represent examples of how the milling device according to the invention can be designed and do not represent a final limitation. Furthermore, the features described below are not to be understood in close connection with other features of the respective embodiment, but can each be provided in a general context or used for this purpose.

[0022] The schematic representation of the Fig. Figure 1 shows a cross-section through a conventional paved road 10, viewed along a direction of travel and the longitudinal direction of the road 10. The road 10 normally has a common multi-layer structure with a durable asphalt surface 12 on top, which is also passable by heavy vehicles and simultaneously serves as the upper carriageway 14. The areas on both longitudinal sides of the carriageway 14, which are compacted but not provided with an asphalt surface 12, form the left- and right-hand shoulders 16, which no longer form the actual carriageway 14, but should in principle be passable.

[0023] The shoulders 16 can be used for diversionary traffic in emergencies, but can also be available for pedestrians. Therefore, the shoulders 16 should not be too soft to allow vehicles that have at least partially come onto the shoulder 16 to safely steer back. Often, the shoulders 16 are slightly inclined and, as they continue and increase their distance from the roadway, lead to sloping embankments, as exemplified by the Fig. 1. In the area of ​​the shoulders 16, guide posts 18 may also be anchored, which cannot be positioned on the roadway 14 and should have a certain small lateral distance from it.

[0024] When repairing an asphalt surface 12 of a road 10 that has been worn and / or damaged by years of vehicle traffic, the worn old asphalt surface 12 must first be milled off with an asphalt milling machine before a new asphalt layer can be applied and installed. During these milling operations, it is common for the milling machine to enter the organic shoulder material and mix this material, at least to a certain extent, with the asphalt millings removed from the asphalt surface 12.

[0025] However, road dirt, pollutants, and vegetation residues, etc., accumulate on and in the shoulders, which generally results in milled shoulder material being classified as hazardous waste and requiring landfilling. Use as a component for future road construction, such as a permeable gravel or granulate layer, is generally not an option due to the unclear contamination situation with pollutants, road dirt, tire wear, and the like.

[0026] If significant volumes of shoulder material are removed and mixed in during the milling of the asphalt surface, the resulting mixed volume of milled material can no longer be easily recycled and thus subjected to sensible and, above all, resource-efficient reuse. Current practice involves excavating this mixed material and reprocessing it before it can be used as the base material for the newly constructed road shoulders.

[0027] The schematic detailed representations of the Fig. 2 to 4 illustrate an exemplary mechanical design for eliminating the disadvantages that have existed so far in the repair and renewal of asphalt surfaces 12 in connection with the unavoidable simultaneous processing of edge strips in the area of ​​the road shoulder 16. Thus, the milling device according to the invention, which is described below with reference to Fig. 2 to 4, the potentially contaminated material that arises during the processing of the road shoulder 16 no longer has to be transported away for reprocessing and / or cleaning, but this material is left on the construction site in order to be able to subsequently reuse it for the construction of the shoulder 16, which is part of the lateral structure of the road body of the processed and / or renewed road 10.

[0028] The invention thus makes it possible to comply with existing legal regulations, which clearly specify the maximum possible distance between the removed material batches and the existing road surface of the road 10 being resurfaced and / or renewed. Specifically, the regulations stipulate that this milled material, which contains both milled road and shoulder material, may only be stored a maximum of five meters away from the existing road surface before it can be immediately reused for the reconstruction or renewal of the shoulders.

[0029] The Fig. The milling device 20 according to the invention, which can be seen in Figures 2 to 4, forms an attachment which can be attached by any practicing road construction company, in particular to suitable carrier devices 22, such as, for example, to an existing wheel loader or a similar self-propelled work machine, which can advantageously be done via a quick-change device 24 in order to enable rapid attachment to the carrier device 22 as well as rapid disassembly from the carrier device 22.

[0030] The milling device 20 according to the invention can, for example, be attached to a frame 26 that can be displaced laterally in a horizontal direction transverse to a direction of travel 28 of the carrier device 22, such that the carrier device 22 can travel on the existing road 10, while the milling device 20 works exclusively in the shoulder area 16. The frame 26 can, for example, be designed in several parts such that a holding frame 30 is located on the quick-change device 24, which can establish a connection to an existing raisable and lowerable coupling device 32. Such a raisable and lowerable coupling device 32 is provided, for example, on the front and rear of all agricultural machines as a known three-point linkage, and is available there in a standardized design for coupling a variety of additional devices.

[0031] For example, cross beams 34 can be arranged on this holding frame 30, which enable the milling device 20 to be displaced and relocated horizontally so that it can be displaced transversely to the longitudinal axis (not shown here) of the carrier device 22, which in turn enables the milling device 20 to be positioned in the shoulder area 16 without the carrier device 22 having to be steered towards or away from the shoulder 16 in order to adopt the exact travel line required in each case.

[0032] Optionally, the milling device 20 can have a displacement device actuated by a hydraulic cylinder (not shown here), so that with its aid it can be displaced laterally transversely to the roadway, namely along the cross members 34 shown.

[0033] Within a housing 36 of the milling device 20, a rotating milling wheel 40 equipped with milling tools, in particular hard metal chisels 38, can preferably be arranged on the circumference, so that the milling wheel 40 is located on a horizontally positioned rotating shaft 42 oriented transversely to the direction of travel 28. This milling shaft 42, which carries the milling wheel 40, can advantageously be driven by a suitable hydraulic motor 44, which can advantageously be controlled and supplied with the required drive energy via the usually present on-board or auxiliary hydraulics of the carrier device 22.

[0034] Due to the rapid rotation of the milling shaft 42 with the milling wheel 40 located thereon, the removed material is removed from the banquet 16 (cf. Fig. 1) are simultaneously crushed and conveyed into the housing 36 via the cutting wheel 40. Since the cutting wheel 40 is arranged in accordance with the views of the Fig. 2 and Fig. 4 rotates in the clockwise direction, the removed material is transported over the cutting wheel 40 and further forward within the housing 36 in the opposite direction of travel 28.

[0035] The direction of travel 28 points from the views of the Fig. 2 to 4 from right to left.

[0036] In the housing 36, in addition to the rotating cutting wheel 40 with its circumferentially arranged hard metal chisels 38, there is also a conveyor screw 46, which is driven in particular by a hydromotor and acts as a discharge screw and in which the drive in the Fig. 2 to 4, a hydraulic motor 44 can also be seen. A rotational axis of the conveyor screw 46, which simultaneously represents its longitudinal center axis, is expediently arranged parallel to the milling shaft 42, ie, is arranged horizontally and transversely to the direction of travel 28.

[0037] The conveyor screw 46, which functions as a discharge screw, conveys the material removed by the rapidly rotating cutting wheel 40 and transported within the housing 36 to the conveyor screw 46 outward at a right angle to the cutting wheel 40, i.e., it conveys this material out of the housing 36 and deposits it on the ground. According to the invention, the deposition area is located in the area of ​​the shoulder 16.

[0038] Optionally, the hydraulic motors 44 can be controlled via suitable electrically controlled directional valves in such a way that not only the rotational speed of the milling wheel 40 but also the significantly lower rotational speed of the conveyor screw 46 can be regulated, effectively adjusting the conveying rate of milled material being removed and discharged. This allows the material flow to be continuously regulated. List of reference symbols 10 Road, paved road 12 Asphalt surface 14 Roadway 16 Banquet, street banquet 18 delineators 20 milling device 22 carrier device 24 Quick-change device 26 frames 28 Direction of travel 30 holding frames 32 Coupling device 34 cross members 36 housings 38 chisels, carbide chisels 40 milling wheel, rotating milling wheel 42 Shaft, milling shaft 44 Hydraulic motor 46 Conveyor screw, discharge screw

Claims

[1] Milling device (20) with a laterally discharging conveyor device for milling a verge area (16) adjoining the side of a road body (10), the characterized by is that the milling device (20) can be attached as an attachment to an existing carrier device (22). [2] Milling device (20) according to claim 1, characterized by that a hydraulically driven rotating cutting wheel (40) is located in a housing (36), which crushes the removed material and thereby throws it horizontally over the cutting wheel (40) against a direction of travel (28). [3] Milling device (20) according to claim 2, characterized by that the hydraulically driven rotating milling wheel (40) is equipped on the outside with milling tools (38), in particular with those made of hard metal. [4] Milling device (20) according to one of the preceding claims, characterized bythat the milled material is conveyed into an open housing (36) and deposited laterally via a hydraulically driven discharge auger (46) arranged therein at right angles to the milling wheel (40). [5] Milling device (20) according to one of the preceding claims, characterized by that the hydraulic motors (44) for driving the cutting wheel (40) and / or the discharge auger (46) are each proportionally adjustable in speed. [6] Milling device (20) according to one of the preceding claims, characterized in that it can be displaced laterally transversely to the roadway via a displacement device actuated by means of a hydraulic cylinder or the like.

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