Construction machine, such as a crane, having an Anti-collision device, and method for operating a plurality of such construction machines

Abstract

The present invention relates to a method for operating a plurality of construction machines such as cranes (1, 2), the movements of which are monitored by anti-collision devices (17, 18), wherein collision zones in the working regions (11, 12) of the construction machines (1, 2) are stored in the anti-collision devices (17, 18) and construction machine movements are monitored for approaching and / or reaching the stored collision zones (17, 18), wherein a temporary priority zone (20) in the working region (11) of a construction machine (1) is transmitted via a communication device (19) to at least one other construction machine (2) and is stored by the aforementioned other construction machine (2) as a temporary collision zone (22) in the anti-collision device (18) of the aforementioned other construction machine when there is an overlap with its working region (12).

Description

[0001] 2260-25 T / sw / she

[0002] Liebherr-Werk Biberach GmbH

[0003] Construction machinery such as a crane with an anti-collision device, as well as methods for operating several such construction machines

[0004] The present invention relates to a method for operating several construction machines, such as cranes, whose movements are monitored for impending collisions by anti-collision devices, wherein collision zones in the working areas of the construction machines are stored in the anti-collision devices, and construction machine movements are monitored for approaching and / or reaching the stored collision zones. The invention further relates to such construction machines themselves, comprising at least one motion device for moving a construction machine element, such as a load hook, a control unit for controlling the motion device, and an anti-collision device for monitoring the machine movements of the construction machine element for possible collisions with another construction machine, as well as to groups of construction machines comprising several construction machines.

[0005] On construction sites, several cranes and other construction machines, such as cable excavators or bulldozers, are regularly used simultaneously. Their typically circular working areas, or in the case of cranes and cable excavators, can partially overlap. This can be due to the spatial conditions of the construction site, but is also necessary to achieve the most complete possible coverage of the site area despite the circular working areas. To prevent collisions between the construction machines or cranes, especially their booms, in the area of ​​partial overlap, cranes and other construction machines are usually equipped with anti-collision devices. These devices monitor crane or machine movements and intervene in the crane or machine's movement within the collision-prone working area, i.e., in the aforementioned overlap area.Machine control intervenes to slow down or stop movements if a collision is imminent.

[0006] The aforementioned anti-collision systems can use suitable sensors to determine the position and movement of the crane or construction machine itself. For example, a rotary encoder on the slewing mechanism can detect the boom's orientation around its vertical axis of rotation, a rocker sensor can detect the boom's rocking position, or a trolley sensor can detect the trolley's position on the boom and thus the reach of the hoist cable. Based on predefined collision zones, the anti-collision system uses the sensor-detected crane position to know when the crane is moving within the aforementioned overlap zone, which poses a risk of collision with another crane.

[0007] To prevent collisions in the overlapping work areas, it would be quite simple to completely block off the overlapping area for at least one construction machine, or to block off one half for one machine and the other half for the other, so that at least one machine could still work in the overlapping area at any given time. However, this would obstruct the other machine's work area too much and prevent the efficient completion of its respective lifting or machine tasks.

[0008] Traditionally, crane operators have coordinated directly with each other, either visually or verbally, or through superiors or, for example, the site foreman. However, such coordination among crane operators is naturally subject to human error and misunderstandings, which can lead to machine collisions.

[0009] On the other hand, it has also been suggested to use a higher-level, additional anti-collision system, or to allow the cranes' anti-collision systems to communicate with each other, so that each system knows whether the other crane is also moving within or approaching the overlap area. To this end, the anti-collision systems transmit the position and / or status data of "their" crane, determined by sensors or other means, to the anti-collision systems of the other cranes. This allows each crane's anti-collision system to consider the position and / or status data of the other cranes when deciding whether to intervene in the crane's control system and influence, or in particular, stop, its movement.

[0010] However, such a higher-level or additional anti-collision system, which includes the anti-collision devices of the individual cranes connected via a network, is complex and expensive and can, in certain situations, impose restrictions that undesirably hinder construction site operations.

[0011] The present invention therefore aims to provide an improved method and an improved construction machine of the type mentioned above, avoiding the disadvantages of the prior art and admirably developing the latter further. In particular, it aims to create an improved use and design of the anti-collision device that reliably prevents machine collisions while simultaneously avoiding undesirable disruptions to work tasks, without requiring complex crane control retrofits.

[0012] According to the invention, the aforementioned problem is solved by a method according to claim 1, a construction machine according to claim 10, and a group of construction machines according to claim 14. Preferred embodiments of the invention are the subject of the dependent claims.

[0013] It is therefore proposed that the anti-collision systems of multiple construction machines communicate with each other in order to dynamically modify collision zones in one or more systems or to adapt them variably to the required working clearance of the other machines. To avoid the need for a higher-level, additional anti-collision system, which might nevertheless be implemented, a construction machine can reserve certain sections or work areas within the overlap of all accessible work areas for a specific period of time. The other machine, or rather its anti-collision system, can then dynamically adjust its collision zones or establish a collision zone that takes the reserved work area into account in response to such a reservation request.

[0014] According to the invention, a temporary priority zone within the working area of ​​a construction machine is transmitted via a communication device to at least one other construction machine. When the transmitted temporary priority zone overlaps with the working area of ​​the other construction machine, a temporary collision zone, which takes the transmitted temporary priority zone into account, is stored in the anti-collision device of the other construction machine. If the transmitted temporary priority zone overlaps with the working area of ​​the other construction machine, its working area is further restricted. The anti-collision device can establish and store a temporary collision zone that can correspond at least to the overlapping portion of the temporary priority zone.

[0015] Through the communicative networking of the anti-collision devices and their training, which allows certain work areas to be reserved as priority zones and a corresponding collision zone to be stored in the other anti-collision device that receives this reservation request, there is no need for a complex, real-time transmission of the actual crane movements to the other anti-collision device or a higher-level additional anti-collision device. Instead, for a limited period during which a construction machine needs the reserved priority zone for a work lift or other task, the work area of ​​the other, potentially colliding construction machine can be restricted accordingly to prevent collisions.

[0016] By limiting and / or allowing changes to priority zones and the corresponding stored or considered collision zones over time, collisions are reliably prevented, while simultaneously enabling the construction machine allocated the priority zone to operate efficiently. At the same time, the working area of ​​the other construction machine is not permanently restricted and can therefore still be used efficiently. The integration of the priority zone for one construction machine with the collision zone of the other, and their dynamic variability over time, combines high collision safety with the efficient use of both or all construction machines, without requiring complex, additional anti-collision systems.

[0017] To facilitate the simple implementation of such a reservation request from one construction machine into a collision zone of another, an advantageous embodiment of the invention allows the temporary priority zone to be defined in global coordinates or construction site coordinates, which apply equally to all construction machines on a construction site, and transmitted to the other construction machine. This enables the other construction machine to immediately "understand" which work area is to be reserved or defined as a collision zone. In particular, the anti-collision device of the other construction machine receiving the reservation request can compare the priority zone transmitted in construction site or global coordinates with the work area of ​​"its" construction machine for overlap, and any potential conflicts can be resolved by the anti-collision device.Overlapping area in which the transmitted temporary priority zone overlaps with the work area, can be stored as a temporary collision zone in the anti-collision device of the aforementioned other construction machine.

[0018] Defining or transmitting the priority zone in construction site or global coordinates can be done directly by the anti-collision device of the construction machine requesting the priority zone and / or transmitted directly to the other construction machine, if the aforementioned anti-collision devices are designed to operate in global or construction site coordinates.

[0019] Alternatively, the determination of the priority zone and its transmission in global or site coordinates can also be accomplished by a central site computer. This computer knows the local, machine-internal coordinates of the various construction machines and their relationship to global coordinates or to each other, and can perform the corresponding conversion. To ensure that the central site computer knows the machine-internal coordinates of each construction machine, these coordinates, such as the orientation of the zero axis for measuring the rotation angle relative to the north-south direction, along with the machine's setup point during assembly or setup on the construction site, can be transmitted to the central site computer in global coordinates and stored there.

[0020] For example, one construction machine can transmit a temporary priority zone in its own machine coordinates to the central site computer. From there, the temporary collision zone can be converted into global coordinates and / or site coordinates, and / or into the machine coordinates of another construction machine, and then transmitted to the other construction machine in these machine coordinates. This approach can be advantageous for integrating construction machines with older anti-collision systems that cannot operate in global coordinates or do not have a global coordinate system. The site computer can store information about the relationship between a construction machine's local machine coordinate system and the global site coordinate system, enabling the site control computer to perform the conversion as described.The central construction site computer can transmit the requested priority zone in global coordinates or construction site coordinates to the other construction machine if its anti-collision device can work with global coordinates.

[0021] If the other construction machine also has an anti-collision device that can only operate in local, own machine coordinates, the construction site computer can perform the conversion to its local machine coordinates, provided the latter are linked to the global construction site coordinates and stored in the construction site computer, and then transmit the requested priority zone in the local coordinates of the other construction machine to it.

[0022] Due to the temporary limitation of the priority zone, it would be possible, in principle, to reserve the entire overlap zone, in which the maximum working areas of the two or more construction machines overlap, completely for one construction machine when such a temporary priority zone is requested, and to store the entire overlap area as a temporary collision zone in the anti-collision device of the other construction machine, so that the anti-collision device completely prevents the construction machines from entering the aforementioned overlap area.

[0023] To minimize disruption to the operation of the other construction machine, an alternative embodiment of the invention provides that only the portion of the total overlap area or the working area of ​​the other construction machine that actually overlaps with the priority zone transmitted by the first-mentioned construction machine is defined as a collision zone and stored in the anti-collision device of the other construction machine. In particular, a portion of the total overlap area of ​​the working areas of the two or more construction machines that lies outside the temporary collision zone can be released by the anti-collision device of the other construction machine as a temporary working area, or remain unoccupied as a working area.

[0024] To ensure maximum safety, the anti-collision system of the construction machine that requested or transmitted the temporary priority zone can only release this temporary priority zone as a work area once feedback is transmitted and received from the other construction machine or from all construction machines. This feedback confirms that either there is no overlap with the work area of ​​the other construction machine, or that a temporary collision zone has been or will be stored in the anti-collision system of the other construction machine, which takes the transmitted priority zone into account. Such feedback, confirming that there is no overlap or that a corresponding collision zone has been established, can be transmitted directly from one construction machine to another. Alternatively, transmission can also occur via the aforementioned central site computer.

[0025] The temporary priority zone is advantageously transmitted in conjunction with an expiry date or time, whereby the corresponding temporary collision zone stored in the anti-collision system of the other construction machine can be automatically or semi-automatically deleted depending on the transmitted expiry date or time. When the expiry date or time is reached, the anti-collision system of the other construction machine can delete the dynamically configured collision zone, so that the corresponding part of the work area is once again available to the other construction machine and can be accessed, thus achieving a minimal temporary disruption to work processes.

[0026] The deletion of the temporary collision zone, depending on the transmitted expiration date or time, can be fully automatic. Alternatively, a semi-automatic deletion process can be implemented, requiring confirmation from the machine operator or, if necessary, from the central site computer. The latter can, for example, provide a corresponding signal that allows the anti-collision system of the other construction machine to delete the temporarily established collision zone.

[0027] Alternatively or additionally to communication regarding a temporary priority zone, construction machines can also communicate with each other, either directly or via the site computer, to transmit a restricted or collision zone set up or stored in the anti-collision system of one machine to the other machine(s). The receiving machine, or its anti-collision system, can then check whether the communicated collision zone also affects and thus overlaps the working area of ​​"its" machine, and if so, saves a corresponding collision zone. Such a collision zone could, for example, be a fixed restricted zone due to an obstacle such as a tree. This eliminates or simplifies the need for duplicate or multiple setups.

[0028] The invention is explained in more detail below with reference to a preferred embodiment and the accompanying drawings. The drawings show:

[0029] Fig. 1: A top view of two construction machines in the form of cranes, which have partially overlapping working areas and are each equipped with anti-collision devices that can communicate with each other, wherein, from the perspective of a first of the two cranes, two priority zones are defined in its working area, and

[0030] Fig. 2: a top view of the two cranes from Fig. 1, illustrating their overlapping working areas from the perspective of the second crane, whereby the defined priority zones of the first crane are checked by the anti-collision device of the second crane for overlap with its working area and the actually overlapping areas are stored as temporary collision zones.

[0031] As the figures show, the construction machines can each be designed in the form of cranes 1 and 2, for example, as tower cranes, whose boom 3 is mounted on a tower 4 and can be rotated about a vertical axis by means of a slewing mechanism 5. The cranes can be designed as top-slewing or bottom-slewing cranes. A trolley 6 can be moved along the aforementioned boom 3 by means of a trolley drive 7 in order to change the reach of the hoist cable 8 running from the trolley 6 and the load hook 9 attached to it. The aforementioned hoist cable 8 can be taken in or lowered by a hoist 10 to raise or lower the load hook 9.

[0032] As the figures show, cranes 1 and 2 can have essentially circular working areas 11 and 12, respectively, which partially overlap, with the overlap of working areas 11 and 12 being indicated by the reference symbol ÜB. These working areas 11 and 12 result from the rotatability of the booms 3 and the mobility of the trolley 6.

[0033] The booms 3 of cranes 1 and 2 can be arranged at different heights, allowing them to move over or under each other. However, depending on the position of the trolley 6, collisions with the unwinding hoist rope 8 may still occur. It is understood, however, that cranes 1 and 2 with their booms 3 can also be arranged at the same height, in which case the booms 3 themselves could collide with each other.

[0034] Each of the cranes 1 and 2 has a crane control system with an electronic control unit 13, which may, for example, include a microprocessor to execute control programs stored in memory. Furthermore, each crane includes sensors 14 to determine the movements and / or the position of the movable crane elements, in particular the rotational position of the boom 3, the position of the trolley 6 on the respective boom 3, and the height of the load hook 9. This can be determined, for example, by sensors assigned to the slewing mechanism 5, the trolley 7, and the hoist 10. Alternatively or additionally, GPS sensors can be used to determine the positions of the crane elements in a global positioning system. Other determination methods, such as radar sensors, can also be provided. Alternatively or additionally, the position can also be determined via geolocation using the mobile network.

[0035] The aforementioned control unit 13 can be connected to input devices 15 for entering control commands that control the crane movements. These input devices 15 can, for example, be located in a crane operator's cabin.

[0036] Furthermore, each of the cranes 1 and 2 includes an anti-collision device 17 and 18, which monitors the crane movements of the respective crane, i.e., "its" own crane, for example by evaluating the signals from the aforementioned sensor system 14. As the figures illustrate, the anti-collision devices 17 and 18 of cranes 1 and 2 can communicate directly with each other and / or with a central control unit, such as a central construction site computer 24, to which the anti-collision devices 17 and 18 are connected, via a communication network 19, and / or communicate with each other via this central control unit 24.

[0037] In particular, the cranes 1, 2 can communicate with each other via the communication device 19 in order to dynamically change and / or adapt to each other the collision zones 22, 23 stored in the respective anti-collision device 17, 18.

[0038] For example, if crane 1 requires a section within its working area 11 to perform a task, a temporary priority zone 20 can be defined in the anti-collision device 17 of crane 1, see Figure 1. This priority zone 20 lies entirely within the working area 11 of crane 1, but only partially within the working area 12 of crane 2, see Figure 2.

[0039] In order to reserve this sub-area for the aforementioned lifting task, crane 1 or its anti-collision device 17 can define the sub-area in global coordinates or construction site coordinates as a temporary priority zone 20 and transmit it to the other crane 2 via the communication device 19, whereby the transmission of the temporary priority zone 20 can be sent directly to the anti-collision device 18 of the other crane 2 or alternatively to the central construction site computer 24 and from there to the anti-collision device 18 of the other crane 2.

[0040] The anti-collision device 18 of the second crane 2 can check the transmitted temporary priority zones 20 for overlap with the working area 12 of the second crane 2, whereby, as Figure 2 shows, it can be determined, for example, that the temporary priority zones 20 partially overlap with the working area 12 of the second crane 2.

[0041] The parts of the temporary priority zone 20 that actually overlap with the working area 12 of the second crane 2 can then be stored by the anti-collision device 18 of the second crane 2 as a temporary collision zone 22, see Figure 2.

[0042] When transmitting the temporary priority zone 20, it is advantageous to also transmit expiry dates or times or validity periods, so that the anti-collision device 18 of the other crane 2 knows during which period or for how long the temporary collision zone 22 must be observed. Depending on the transmitted expiry date or time, the anti-collision device 18 can also delete the temporarily stored collision zone again, so as not to restrict the operating radius of crane 2 unnecessarily for a long time. As long as the collision zone 22 is stored, the anti-collision device 18 can restrict crane movements of the second crane 2 if an approach to or movement into the respective collision zone is imminent.

[0043] For example, when approaching a collision zone 21, the respective crane movement can be slowed down and then stopped upon actually reaching the collision zone, so that the crane 2 can only perform movements that do not lead further into the collision zone or lead away from it. In particular, the rotation angle of the crane boom 3 about the vertical axis and the travel path of the trolley 6 along the boom 3 can be mutually coordinated and limited so that the load hook 9 of the crane 2 cannot enter the aforementioned collision zone 22. More generally, the rotation of the boom 3 can also be limited independently of the trolley position to prevent the boom 3 from pivoting into or over the respective collision zone 22.

[0044] The anti-collision devices 17 and 18 can each evaluate the aforementioned data and, for example, execute a collision detection program that can be stored in memory and executed by a microprocessor of the electronic anti-collision device. If a collision is imminent, the respective anti-collision device 17 or 18 can intervene in the control of its own crane and, for example, display a warning signal to the crane operator and / or stop the crane's movement.

[0045] The temporary collision or priority zone 22 can be stored, for example, with or only upon the consent of the affected construction machine or crane 2, or its operator. Other construction machines, such as concrete pumps, mobile cranes, and the like, can also be taken into account. Furthermore, obstacles in the air, such as drones, can be considered when determining the temporary collision or priority zones 22, or even a permanent collision or exclusion zone 21. If necessary, data can also be exchanged with such auxiliary machines, such as drones, to transfer the collision, priority, or exclusion zones from the drone or auxiliary machine to the construction machine 1, 2 and / or vice versa, and to store them accordingly in the anti-collision device 17, 18 at the communication destination.

[0046] Advantageously, communication between the construction machines can be carried out securely, so that the registration and blocking of a temporary collision zone 22 can be recorded with a performance level.

[0047] As explained at the beginning, the temporary priority zone 20, insofar as it lies within the overlap area ÜB, can only be released for the first crane 1 if confirmation has been sent from the second crane 2 that a corresponding collision zone has been set up.

[0048] To avoid unnecessarily restricting the working area 12 of the second crane 2, an advantageous embodiment of the invention provides that the second crane 2, or its anti-collision device 18, can, if necessary, transmit a request to the first crane 1 as to whether the temporary priority zone 20 is still required by the first crane 1. If the first crane 1 transmits a response indicating that the zone is no longer needed, the anti-collision device 18 of the second construction machine 2 can delete the corresponding collision zone 22. The stored collision zone 22 can also be deleted if no response is received from the first crane 1 to the aforementioned request, and in particular, if no response is received indicating that the priority zone is still required.

[0049] In a further development of the invention, the anti-collision devices 17, 18 can also be configured such that exclusion zones learned in the anti-collision device 17 of one machine, in particular a manually learned exclusion zone, are transferred to the anti-collision device 18 of the other crane 2, which can be done directly or via the central site computer 24. Such an exclusion zone in the working area 11 of the first crane 1 is marked with the number 21 in the figures.

[0050] The anti-collision device 18 of the other crane 2 can, analogously to the check of a temporary priority zone 20, verify whether the permanent exclusion zone 21 of the first crane 1 also affects the working area 12 of "its" second crane 2. If an overlap exists, a corresponding portion of the exclusion zone can then be defined and stored as a collision zone 23 for the second crane 2. The process for transmitting, verifying, and storing the temporary priority zone 20 and the resulting collision zone 21 can be analogous, allowing for reference to these processes. Only the transmission of an expiry date or time can be omitted.

Claims

2260-25 T / sw Liebherr-Werk Biberach GmbH Construction machinery such as a crane with an anti-collision device, as well as methods for operating several such construction machines Claims 1. Method for operating several construction machines such as cranes (1, 2), the movements of which are monitored by anti-collision devices (17, 18), wherein collision zones in the working areas (11, 12) of the construction machines (1, 2) are stored in the anti-collision devices (17, 18) and construction machine movements are monitored for approach to and / or reaching the stored collision zones, characterized in that a temporary priority zone (20) in the working area (11) of a construction machine (1) is transmitted via a communication device (19) to at least one other construction machine (2) and is stored by the said other construction machine (2) as a temporary collision zone (22) in the anti-collision device (18) of the said other construction machine when it overlaps with its working area (12).

2. Method according to the preceding claim, wherein the temporary priority zone (20) is defined in global coordinates or site coordinates that apply equally to all construction machines (1, 2) and is linked to the aforementioned other construction machine (2) is transmitted, and is compared by the anti-collision device (18) of the said other construction machine (2) with the working area (12) of the said other construction machine (2) for overlap, whereby any overlapping area in which the transmitted temporary priority zone (20) overlaps with the working area (12) is stored as a temporary collision zone (22) in the anti-collision device (18) of the said other construction machine (2).

3. Method according to claim 1, wherein said one construction machine (1) transmits the temporary priority zone (20) via the communication device (19) in its machine coordinates to a central construction site computer (24), from which the temporary collision zone (22) is converted into global coordinates and / or construction site coordinates and / or converted into machine coordinates of the other construction machine and is transmitted in these machine coordinates of the other construction machine (2) to said other construction machine (2).

4. Method according to one of the preceding claims, wherein a part of the total overlap area (OA) of the working areas (11, 12) of the two construction machines (1, 2), which lies outside the temporary collision zone (22), is released by the anti-collision device (18) of said other construction machine (2) as a temporary working area or remains free as a working area.

5. Method according to one of the preceding claims, wherein the temporary priority zone (20) for the construction machine (1) requesting this temporary priority zone (20) is only released as a working area by the anti-collision device (17) of said construction machine (1) when a confirmation has been transmitted by said other construction machine (2) via a communication device (19) that said temporary collision zone (22) has been saved or that there is no overlap between the temporary priority zone (20) and the working area (12) of said other construction machine (2).

6. Method according to one of the preceding claims, wherein the temporary priority zone (20) linked to an expiry date and / or an expiry time is transmitted from the said one construction machine (1) and the temporary collision zone (21) stored in the anti-collision device (18) of the said other construction machine (2) is automatically or semi-automatically deleted depending on the transmitted expiry date and / or the transmitted expiry time.

7. Method according to one of the preceding claims, wherein, upon receipt of the temporary priority zone (20) from the said other construction machine (2), the said temporary collision zone (22, 23) is only stored in the anti-collision device (18) when a confirmation signal has been entered at an input device of the said other construction machine (2).

8. Method according to the preamble of claim 1 or one of the preceding claims, wherein a collision zone (21) in the working area (11) of a construction machine (1), which has been stored in its anti-collision device (17), is transmitted via a communication device (19) to at least one other construction machine (2) and is also stored as a collision zone (23) by the said other construction machine (2) in the anti-collision device (18) of the said other construction machine when overlapping with its working area (12).

9. Method according to the preceding claim, wherein the collision zone (21) of the construction machine (1) is defined in global coordinates or site coordinates that apply equally to all construction machines (1, 2) and transmitted to the other construction machine (2), and is compared by the anti-collision device (18) of the other construction machine (2) with the working area (12) of the other construction machine (2) for overlap, wherein any overlapping area in which the transmitted collision zone (21) overlaps with the working area (12) overlaps, is stored as a collision zone (22) in the anti-collision device (18) of the other construction machine (2).

10. Construction machine, in particular in the form of a crane (1), comprising at least one movement device for moving a construction machine element such as a load hook (9), a control unit (13) for controlling the movement device, and an anti-collision device (17) for monitoring the machine movement of said construction machine element for possible collisions with obstacles in a working area (11) of the construction machine (1), characterized in that the anti-collision device (17) comprises a priority zone module (25) for variably defining a temporary priority zone (20, 21) in the working area of ​​the construction machine (11) and a communication device (19) for transmitting the temporary priority zone (20, 21) in the working area (11) of the construction machine (1) to at least one other construction machine (2) and is configured to display the received temporary priority zone (20, 21) upon receipt of a temporary priority zone (20, 21) from the other construction machine (2). (20,21) to check for overlap with the working area (11) of the construction machine (1) and, in case of overlap, to automatically or semi-automatically save it as a temporary collision zone (22, 23) and to monitor construction machine movements for approach and / or reaching the saved temporary collision zone (20, 23).

11. Construction machine according to the preceding claim, wherein the anti-collision device (17) is configured to automatically or semi-automatically delete the temporary collision zone (22, 23) depending on an expiry date and / or expiry time received together with the temporary priority zone (20, 21).

12. Construction machine according to one of the two preceding claims, wherein the priority zone module (25) is configured to define the temporary priority zone (20, 21) in site and / or global coordinates.

13. Construction machine according to the preamble of claim 10 or one of claims 10 to 12, wherein the anti-collision device (17) is configured to a stored collision zone (21) located in the work area (11) it monitors is to be made available to the communication device (19) for the transmission of the stored collision zone (21) in the work area (11) of the construction machine (1) to at least one other construction machine (2), and is furthermore designed to check the received collision zone (20, 21) for overlap with the work area (11) of the construction machine (1) upon receipt of a collision zone (21) from the other construction machine (2) and, in case of overlap, to automatically or semi-automatically also store it as a collision zone (22, 23) and to monitor construction machine movements for approach and / or reaching the stored collision zone (20, 23).

14. Construction machinery group comprising a first construction machine (1) and a second construction machine (2), each having an anti-collision device (17, 18) for monitoring machine movements, wherein the anti-collision device (17) of the first construction machine (1) is configured to transmit a temporary priority zone (20, 21) to the second construction machine (2) via a communication device (19), and wherein the anti-collision device (18) of the second construction machine (2) is configured to check the received temporary priority zone (20, 21) of the first construction machine for overlap with the working area (12) of the second construction machine and, in case of overlap, to store it as a temporary collision zone (22, 23) and to monitor machine movements for approaching and / or reaching the stored temporary collision zone (22, 23).

15. Construction machinery group according to the preceding claim, wherein the temporary priority zone is transmitted by the anti-collision device (17) of the first construction machine (1) linked to an expiry date and / or an expiry time, and the anti-collision device (18) of the second construction machine The machine stores the temporary collision zone (22, 23) only for a limited time depending on the received expiry date and / or received expiry time.

16. Construction machinery group according to one of the two preceding claims, wherein at least one of the first and second construction machines (1 , 2) is designed as a crane, in particular a tower crane.

17. Construction machinery group according to one of claims 14 to 16, wherein each of the at least two construction machines (1 , 2) is designed according to one of claims 10 to 13.

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