Device for documenting a construction site

Abstract

The present invention relates to a device for documenting a construction site with at least one crane, with a sensor system for detecting construction site information which has at least one imaging sensor unit mounted on the crane for detecting images of the construction site, a crane state determination device for determining crane states, and an electronic computing unit for processing the detected construction site images and the determined crane states, the computing unit having a tuple device for determining context-sensitive tuples from the detected construction site images and the determined crane states.

Description

[0001] Device for documenting a construction site

[0002] The present invention relates to a device for documenting a construction site with at least one crane, with a sensor system for capturing construction site information, which has at least one imaging sensor unit attached to the crane for capturing images of the construction site, a crane state determination device for determining crane states, and an electronic computing unit for processing the captured construction site images and the determined crane states.

[0003] The construction processes taking place on construction sites are diverse and complex and usually characterized by the fact that many manufacturing and logistics processes run in parallel and take place in a very limited space. Obtaining an overview of the entire construction process is often very difficult, as the people responsible for documenting and recording the actual status can usually only observe individual processes to a limited extent and locally. Holistic and continuous documentation of the construction processes taking place on a construction site, as well as recording the actual status of the site for control purposes, is generally hardly possible. To date, attempts have been made to manually document the construction site processes, usually on a daily basis, in a construction diary, in order to at least have a rough overview and to be able to refer back for control tasks.Photo apps for mobile devices are sometimes used to compile daily events. These allow individual images of the construction site to be captured, annotated, and saved in a project context. However, the maintenance effort required to update such photo apps is considerable. The results often remain fragmented, resulting in unnecessary additional work or duplicate tasks for multiple construction site participants.

[0004] Based on this, the present invention is based on the object of creating an improved device for documenting construction sites that avoids the disadvantages of the prior art and advantageously develops the latter. In particular, the aim is to enable the most comprehensive recording of construction site processes and situations possible in a simple manner and to make this available to various construction site participants in a coordinated manner.

[0005] According to the invention, the stated object is achieved by a device according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.

[0006] It is therefore proposed to utilize the exposed location of a crane on the construction site and the views of the site available from the crane to enable a holistic assessment of the construction site situation. The actual situation is ensured by the diverse information that can be provided by at least one imaging sensor unit and the crane's status data.

[0007] According to the invention, the construction site images captured by the at least one imaging sensor unit mounted on the crane and the determined crane status data are processed by a tuple device into context-sensitive tuples and provided to other data processing devices via at least one interface of the computing unit. Said tuple device is designed to consolidate the image data provided by the imaging sensor unit and the crane status data provided by the crane status determination device continuously or cyclically, or triggered by a trigger, and to provide them as context-sensitive tuples for further use.Such context-sensitive tuples form an ordered collection of values ​​in the form of data records in which the construction site images provided or streamed by the imaging sensor unit and the cyclically provided or continuously streamed crane status data are linked to each other and stored in a list that can preferably no longer be changed subsequently.

[0008] The aforementioned crane status data can advantageously be provided as telemetry data from the crane control system, since the electronic crane control system knows at least some of the relevant crane status data. Modern cranes typically have a comprehensive sensor system with various sensors that detect various crane statuses and provide them to the electronic crane control system. Via a telemetry data module, the aforementioned crane status determination device can query all telemetry data or a relevant section of the telemetry data from the crane control system and / or receive telemetry data provided by the crane control system and filter out relevant crane status data or determine it from the transmitted telemetry data in order to determine the crane statuses of interest for the tuple formation.

[0009] If the telemetry data from the crane control system is incomplete or if the crane control system does not have a suitable interface for transmitting the telemetry data, the crane states of interest can also be recorded using sensors. A mixed acquisition of the crane states of interest is also possible, i.e. some of the crane states can be determined from the telemetry data received from the crane control system, and the remaining missing part of the crane states of interest can be recorded using sensors using crane state sensors. Various parameters characterizing the crane state can be recorded or determined as crane states. Position and / or alignment data of one or more crane elements can be particularly helpful in order to be able to context-sensitively classify the construction site images recorded by the imaging sensor unit.to be able to easily determine in which areas of the construction site the crane was working and the corresponding construction site images were provided by the imaging sensors.

[0010] In order to determine the position and / or orientation of one or more crane elements, the aforementioned telemetry data module can filter out and / or process position- and / or orientation-relevant telemetry data for position and / or orientation determination and / or query it from the crane control system. For example, the electronic crane control system typically knows the lowering depth of the load hook and / or the position of the trolley on the boom and / or the slewing gear position and thus the alignment of the boom around the upright slewing gear axis, so that the electronic crane control system can provide the aforementioned information as telemetry data, which can be used by the telemetry module to determine the crane states, for example, the load hook position and / or the boom alignment.

[0011] Alternatively or additionally, to determine the position and / or orientation of one or more crane elements, the aforementioned crane sensor system can comprise one or more position and / or orientation sensors, which can be attached to one or more crane elements. In particular, the crane sensor system can comprise one or more location and / or position sensors, for example in the form of a GPS module, on one or more crane elements such as a tower, a boom, a counter-jib, a trolley, or a load hook, in order to be able to record the position of the respective crane element in absolute coordinates.

[0012] Alternatively or additionally, the crane sensor system can also include inertial and / or position sensors for detecting, for example, a load hook position. Such position and / or inertial sensors can be located, for example, on a trolley or a hoist rope discharge point, or on the load hook itself, or on several of the aforementioned crane elements. For example, an IMU can be used on the load hook to detect or determine the load hook position using sensors.

[0013] In a further development of the invention, however, other crane states can also be detected by sensors beyond the aforementioned position and / or alignment data. For example, one or more of the following sensors can be provided or attached to the crane in order to detect, for example, weather or climate and / or crane environment data: a temperature sensor, a humidity sensor, a rain or moisture sensor, a salinity sensor and / or a UV light dosimeter. Alternatively or additionally, an environmental sensor system can also be provided on the crane for detecting objects in the vicinity of the crane, wherein such an environmental or ambient sensor system can comprise, for example, a light detection module, in particular a laser scanning module. For example, a lidar module can be provided for detecting environmental objects in the crane's vicinity or on the construction site using laser light.

[0014] Alternatively or additionally, the environmental sensor system can also include a radar module for detecting environmental objects using radar waves.

[0015] The said imaging sensor unit may comprise one or more cameras and / or one or more other imaging, in particular pixel-based, sensors, wherein, for example, a line camera and / or a matrix camera and / or a CCD sensor and / or a CMOS sensor may be provided.

[0016] One or more imaging sensor units can be mounted on the boom of the crane and / or on the tower of the crane and / or on another structural component of the crane, preferably in an upper half of the overall height of the crane.

[0017] To enable a meaningful data link between the image data from the at least one imaging sensor unit and the crane status data from the crane status determination device, the device can further comprise a timer that provides the associated time data for the respectively acquired image data of the construction site and the respectively determined crane status data. For example, said timer can comprise a real-time clock, the time data of which is linked to said image data of the construction site and the crane status data, for example, stored in a linked manner, and / or used by the tuple device to chronologically form the context-sensitive tuples from the image data of the construction site and the crane status data.

[0018] The said timer can also be used to initiate the consolidation of the image data and the crane status data at predetermined time intervals or in certain cycles, in particular to cyclically initiate the tuple formation and / or provision.

[0019] The timer can be part of the computing unit or can be provided externally and connected to it.

[0020] The said computing unit can advantageously be provided with a plurality of interfaces in order to be able to receive in parallel at least the image data of the at least one imaging sensor and the telemetry and / or sensor data for the crane states to be determined and to provide the determined context-sensitive tuples to other devices.

[0021] In particular, the computing unit can comprise at least one image data interface, at least one crane status interface and at least one tuple interface, wherein, if necessary, several access interfaces can also be provided for access by several users simultaneously.

[0022] Advantageously, the computing unit comprises interfaces of various types to enable the connection of various sensor units and / or various end devices and / or various additional modules. For example, interface software can be provided, which can be used to connect end-user devices such as tablets or smartphones, on which special system applications can be installed to further process or evaluate the provided tuple data or, conversely, to enter specific construction process data. This allows construction site personnel such as a crane operator or ground personnel to communicate with the device and enter the required inputs.

[0023] Advantageously, one or more programmable interfaces can be provided in order to enable device- and / or user-specific configuration.

[0024] In a further development of the invention, dedicated interfaces can be provided for different devices and / or units to be connected, which the respective device or unit does not have to share with other devices or construction sites. The respective interface can be available at full performance exclusively to the module connected to it.

[0025] In particular, the at least one imaging sensor unit can be connected to the computing unit via a dedicated interface. In the case of multiple imaging sensor units, each sensor unit can also be connected via a dedicated interface. This allows the computing unit to receive high-volume or data-rich video streams without experiencing performance degradation or delays due to potential bottlenecks in data transmission in network components such as switches.

[0026] Other sensors for determining crane status data can also be connected to the computing unit via a dedicated interface.

[0027] Alternatively or additionally, a dedicated interface can also be provided for providing the telemetry data to the computing unit.

[0028] End-user devices that can be connected to the computing unit, such as smartphones or tablets, can advantageously be connected via standard interfaces and / or communicate with each other using standardized transmission technology. A data network, for example an Ethernet data network, particularly in the form of an IEEE 802.3 network, can advantageously be provided to enable communication between end-user devices and / or system modules.

[0029] Advantageously, the power supply to one or more sensor units can be provided via the data network, for example using PoE or PoE+, i.e. Power over Ethernet.

[0030] The invention is explained in more detail below using a preferred embodiment and the accompanying drawings. In the drawings:

[0031] Fig. 1: a schematic representation of the components of a device for documenting a construction site according to an advantageous embodiment of the invention, wherein on the one hand the components of the device provided on a crane and on the other hand the components communicating with it of a construction site control system that can be connected via the Internet are shown, and

[0032] Fig. 2: an activity and data flow diagram illustrating the activity of the various components of the device of Fig. 1 and the data flow between said components.

[0033] As Figure 1 shows, the documentation device 2 can be provided on or connected to a crane 1, which can be designed as a tower crane, although other crane types such as a telescopic boom crane with a luffing boom can also be provided if necessary. A crane 1 with sufficient height to provide an overview of the construction site is advantageously used. As Figure 1 shows, such a crane 1 can comprise a boom 4, from which a load hook 6 runs via a hoist rope 5, wherein the hoist rope 5 can run, for example, from a trolley 7 that can be moved along the boom 4. The said boom 4 can be seated on a tower 8 and can be pivoted about an upright axis relative to or with the tower 8.

[0034] The documentation device 2 comprises an electronic computing unit 9, which comprises one or more processors, for example in the form of microprocessors, and one or more program memories for storing program modules that can control the at least one processor and / or be processed by the processor and / or influence data processing carried out by the processor.

[0035] Advantageously, the computing unit 9 is designed to be modularly configurable in order to be able to connect or import various hardware components and / or software modules, for example in the form of apps, in order to be able to adapt the function and mode of operation of the computing unit 9 to the respective documentation task and / or the respective existing recording devices.

[0036] In particular, various software modules can be installed on the aforementioned computing unit 9 in order to be able to use the documentation device 2 in various configurations for a partially or fully automated detection of objects on the construction site surrounding the crane 1 and / or detection of the construction processes taking place there.

[0037] Said computing unit 9 advantageously has various interfaces in order to be able to receive and process data streams from various sensor units and data streams from the electronic crane control system 10. Said crane control system 10 can be a control unit known per se for monitoring and controlling the crane operation and / or crane components, wherein the crane control system 10 can, for example, control crane drives such as a slewing gear drive, a trolley drive, a hoist drive, for example in dependence on control commands entered by a crane operator at the control station via corresponding input means. Alternatively or additionally, the crane control system 10 can also monitor various crane functions, for example, carry out load monitoring and for this purpose receive data from crane sensors such as a hoist load sensor system and a

[0038] Take projection sensors into account.

[0039] Advantageously, the computing unit 9 can each have a dedicated telemetry data interface 11 for receiving telemetry data from the crane control 10 and / or a dedicated sensor interface 12 for receiving sensor data from one or more sensor units.

[0040] As Figure 2 illustrates, a separate dedicated interface can also be provided for different sensors to avoid bottlenecks when importing the potentially extensive sensor data streams. In particular, such a dedicated sensor interface 12 can be provided for at least each imaging sensor unit 13 that transmits an image data stream to the computing unit 9.

[0041] One or more imaging sensors 13, which may each comprise a camera and / or a pixel matrix-like sensor module, for example, are mounted on the crane 1, wherein an imaging sensor unit 13 may preferably be attached to the boom 4 and / or to the trolley 7 and / or to the load hook 6 and / or to the tower 8, wherein the imaging sensor unit may preferably be directed towards the crane environment or the construction site on which the crane 1 is erected in order to observe the construction site and provide a video stream of the construction site.

[0042] As Figure 1 shows, the sensor system 14 of the documentation device 2 can have additional sensor units 15 for detecting further crane status and / or crane environment parameters, for example in the form of a weather sensor and / or temperature sensor and / or an environmental sensor, for example in the form of a lidar sensor. Other sensor units such as radar detection devices for detecting objects in the crane environment or on the construction site can also be provided. Other sensor units such as transponders or RFID readers can also be provided in order to be able to detect data from objects on the construction site. The aforementioned sensor units 13, 15 of the sensor system 14 can communicate with the respective sensor interface 12 via a cable or wirelessly. The same applies to the telemetry data transmission, which can take place wirelessly or via a cable from the crane control system 10 to the computing unit 9.

[0043] Wireless data transmission can be carried out, for example, in WiFi format, LTE format, or 5G format.

[0044] As Figure 1 further shows, due to the modular design, additional end-user devices that users can use on the construction site 1 can be connected to the central processing unit 9 of the documentation device 2. For example, an end-user device 16 of a crane operator and / or an end-user device 17 of a ground crew member can be connected to the processing unit 9 via a respective interface in order to communicate with it. Smartphones or tablets, for example, can be used as end-user devices 16, 17, onto which a software module can be installed that can be adapted to the processing unit 3 and its functions and / or can share certain functions with the processing unit 3 and / or can query certain function and information packages from the processing unit 3 and / or transmit them to the processing unit 3.

[0045] The mentioned end-user devices 16, 17 can each be connected via an end-user interface 18 of the computing unit 9.

[0046] As Figure 1 further shows, the computing unit 9 can also comprise a network interface 19 in order to be able to be connected to a construction site server and / or a BIM server 20, in which a construction site information model can be kept in the form of a database, and / or to a network of a building contractor.

[0047] However, the documentation device 2 can also communicate with other system participants away from the construction site by remote data transmission, in particular via the Internet, and for this purpose can have a communication device 21 which can, for example, have a mobile radio reception device or a landline connection for data transmission via mobile radio or landline.

[0048] For example, a crane manufacturer can communicate with the computing unit 9 of the documentation device 2 via the aforementioned communication device 21. Alternatively or additionally, an information server available on the Internet can be connected. Alternatively or additionally, a construction project-specific server, for example in the form of a BIM server, can also communicate with the computing unit 9 via the Internet or the communication device 21, providing design data for the construction project.

[0049] As Figure 2 shows, the computing unit 9 can also be modularly expanded or reconfigured within the aforementioned communication interfaces 11, 12, 18, 19 by installing special software modules on the computing unit 9. This can, in particular, include a data analysis module 22 for analyzing the telemetry data input by the crane control system 10 and / or the sensor data provided by the sensor system 14. Such a data analysis module 22 can, for example, include a software app that can be installed on the computing unit 9.

[0050] Alternatively or in addition to such a data analysis module 22, an object identification module 23, for example in the form of a software app, can also be installed on the computing unit 9 in order to identify objects detected by the imaging sensor unit 13 and / or another sensor unit 15 in the vicinity of the crane 1 or on the construction site. Such an object identification module 23 can, for example, comprise an image evaluation device to identify an object based on specific contours in the construction site images, possibly with the aid of additional data that can be provided from the BIM server 20. Alternatively or additionally, depending on the design of the sensor, another type of object identification can also take place, for example using read transponder data.Alternatively or additionally, a process identification module 24, for example in the form of a software module, can be installed on the computing unit 9 to automatically identify certain construction site processes, such as excavation work, which can be identified based on recorded machine activities such as dredging work or by means of an image analysis module. The process identification module 24 can also access data from the BIM server in addition to the sensor data from the sensor system 14.

[0051] As Figure 2 illustrates, the computing unit 9 is further supplied with time data from a timer 25, for example in the form of a real-time clock, with the aid of which the computing unit 9 can temporally assign the supplied image data streams and sensor data streams and / or telemetry data streams to one another and classify them chronologically.

[0052] The time data of the timer 25 can also be fed to a cycle trigger 26 in order to trigger or accomplish the tuple formation cyclically or possibly continuously and to form and provide the context-sensitive tuples mentioned above from the supplied data streams and any sensor and / or telemetry data derived therefrom.

[0053] As Figure 2 illustrates, the data processing and tuple formation can also be triggered by a trigger device 27, which can provide a trigger signal, for example, depending on certain events and / or a manual actuation.

[0054] As is clear from the above description, the documentation device 2 can solve or at least mitigate the problems of conventional systems outlined above by utilizing the exposed location of tower cranes and the possible views of the construction site from cranes 1 to enable a holistic recording of the construction site situation. The actual situation is ensured by the diverse information that can be provided by at least one imaging sensor unit 13 and the crane's status data, in particular telemetry data from the electronic crane control system. Missing crane status data can be acquired or provided via additional physical sensors 15, which can be integrated into the system via a standard network interface.

[0055] Via the processing unit 9, the recorded information can be transmitted to processing systems both on the internet and on the intranets of the crane manufacturer or participating construction companies. If the crane 1 does not have a suitable communication unit, such as Wi-Fi, LTE, or 5G, the processing unit 9 can be expanded with appropriate communication modules.

[0056] In addition, the computing unit 9 has interface software. This software allows end-user devices 16, 17, such as tablets or smartphones, on which a special system application or user app is installed, to be integrated into the system.

[0057] This makes it possible for construction participants, such as crane operators or ground personnel (foremen, riggers, etc.), to communicate with the system and enter the necessary inputs. Furthermore, it is possible to display the system status and the current recorded status of the construction site on terminals 16 and 17.

[0058] The documentation facility 2 includes various specific aspects.

[0059] In particular, the systems concept plays a key role. This enables holistic and continuous construction site documentation through a modular and flexible structure that can be adapted to the specific construction site situation. With appropriate software modules that can be installed on the aforementioned computing unit 9, the system can also be used for the (semi-)automated detection of objects and processes. The smallest version of the system can consist, in particular, of the computing unit 9, a sensor unit with an optical sensor 13, and an interface for telemetry data. Possible extensions include additional sensor units 15 and data transmission to remote networks and to mobile devices 16, 17 on the construction site via radio (e.g., Wi-Fi, LTE, 5G) or wired.At least one data transmission extension may be recommended to retrieve the collected information about the construction site. For receiving data streams from the sensor unit(s) 13, 14, 15 (such as video streams), dedicated network interfaces 11, 12 are preferably available on the computing unit 9 to avoid potential bottlenecks during data transmission in network components such as a switch.

[0060] If the crane 1 in use does not have a suitable or usable interface for transmitting telemetry data, this data can also be acquired by a corresponding sensor unit 14, 15, e.g., using positioning technologies such as GPS or inertial and position sensors for determining the hook position. Further applications for additional sensor units 15 can include the recording of environmental conditions, such as weather data.

[0061] Another aspect is the consistent use of standardized interfaces and transmission technologies. The individual system modules are preferably connected to each other via an Ethernet data network such as IEEE 802.3. Power for the sensor units 13, 15 can be supplied via "Power over Ethernet" (P0E / P0E+ and future standards such as IEEE 802.3). Any standardized data / video streams, such as RTSP or GigE Vision, can be processed in the processing unit 9.

[0062] For data transmission, if the crane 1 does not already have a corresponding modem unit, the processing unit 9 can be expanded with the required transmission module 21. Radio standards such as Wi-Fi (IEEE 802.11), LoRa, LTE, 5G, and future standards can be used for this purpose. Construction site documentation can be carried out, in particular, by consolidating the available information from the sensor units 13, 15 and telemetry data continuously or at predefined intervals or by triggering them and making them available as context-sensitive tuples for further use (see Fig. 2).

Claims

Claims: Device for documenting a construction site with at least one crane (1), with a sensor system (14) for capturing construction site information, comprising at least one imaging sensor unit (13) attached to the crane (1) for capturing images of the construction site, a crane state determination device (30) for determining crane states, and an electronic computing unit (9) for processing the captured construction site images and the determined crane states, characterized in that the computing unit (9) comprises a tuple device (31) for determining and providing context-sensitive tuples for construction site documentation from the captured construction site images and the determined crane states.Device according to the preceding claim, wherein the crane state determination device (30) comprises a telemetry data module (32) for querying and / or receiving telemetry data from an electronic crane control (10) and determining the crane states from the telemetry data transmitted by the crane control (10), and the tuple device (31). is configured to determine the context-sensitive tuples taking into account the telemetry data transmitted by the electronic crane control (10). Device according to one of the preceding claims, wherein the crane state determination device (30) comprises a crane sensor system (14) for sensorially detecting at least some of the crane states. Device according to the preceding claim, wherein the crane sensor system (14) comprises at least one position and / or orientation sensor unit (15) for determining the position and / or orientation of at least one crane element of the crane (1), and the tuple device (31) is configured to determine the context-sensitive tuples taking into account the position and / or orientation of the at least one crane element.Device according to the preceding claim, wherein said position and / or orientation sensor unit (15) has at least one position and / or orientation sensor on a boom (4) of the crane (1) and / or on the load hook (6) of the crane (1) and / or on a trolley for detecting the position and / or orientation of said boom (4) and / or trolley (7) and / or load hook (6), and the tuple device (31) is configured to determine the context-sensitive tuples taking into account the position and / or orientation of the boom (4) and / or trolley (7) and / or load hook (6). Device according to any of the preceding claims, wherein the computing unit (9) has separate telemetry and sensor interfaces for connecting the electronic crane control (10) of the crane (1) on the one hand and for connecting the at least one imaging sensor unit (13) and / or other sensor units (15) on the other.Device according to one of the preceding claims, wherein the computing unit (9) has at least one dedicated sensor interface (12) for the at least one imaging sensor unit (13). Device according to the preceding claim, wherein the computing unit (9) has at least one further dedicated sensor interface (12) for at least one further sensor unit (15) and at least one further dedicated telemetry interface (11) for connecting the crane control (10). Device according to any of the preceding claims, wherein the computing unit (9) has a modularly expandable design and is configured to share documentation-relevant functions for documenting the construction site with at least one expansion module, wherein said expansion module can optionally be installed either on a separate, mobile end-user device (16, 17) that can be connected to the computing unit (9) via an end-user interface (18), or on the computing unit (9) itself.Device according to the preceding claim, wherein the at least one expansion module comprises an object identification and / or a process identification module (23; 24) for identifying objects or processes on the construction site where the crane (1) is mounted, from the captured construction site images and the determined crane states. Device according to one of the two preceding claims, wherein the at least one expansion module comprises a data evaluation module (22) for evaluating the construction site images from the at least one imaging sensor unit (13) and for evaluating the crane states from the crane state determination device (30). Device according to one of the preceding claims, wherein the computing unit (9) comprises several end-user interfaces (18) for connecting several end-user devices (16, 17) that can be used on the construction site in parallel, wherein said end-user devices (16, 17) are preferably connected via Ethernet-enabled interfaces.Device according to one of the preceding claims, wherein the computing unit (9) comprises at least one network interface (19) for connecting a construction site server (20) which is provided at the construction site on which the crane (1) is mounted. Device according to any one of the preceding claims, wherein the computing unit (9) comprises interface software for integrating end-user devices (16, 17) of various types, on which an expansion module for using and / or influencing documentation-relevant functions for documenting the construction site is installed. Device according to any one of the preceding claims, wherein a communication device (21) connected to the computing unit (9) comprises remote data transmission and remote communication with at least one server installed away from the construction site. Device according to any one of the preceding claims, wherein at least one temperature sensor unit (15) and / or at least one weather sensor unit (15) is provided and the tuple device (31) is configured to form the context-specific tuples taking into account the temperature and / or weather data of the at least one temperature and / or weather sensor unit (15).Device according to one of the preceding claims, wherein at least one environmental sensing unit comprising a laser and / or radar sensor unit (15) for detecting objects in the vicinity of the crane (1) is mounted on the crane (1), and the tuple device (31) is configured to form the context-sensitive tuples taking into account the detected environmental data from said environmental sensor data. Device according to one of the preceding claims, wherein at least one timer (25), preferably comprising a real-time clock, is provided for providing time data, and wherein the tuple device (31) is configured to form the context-sensitive tuples in chronological order taking into account the time data. Device according to one of the preceding claims, wherein a power supply device for supplying power to the sensor units (13, 15) on the crane (1) is provided, which includes a network module, in particular an Ethernet module. for supplying power to the sensor units via a data network to which the sensor units are connected, and at least one sensor unit (13, 15) mounted on the crane is configured to be powered via a data network connection. Crane, in particular tower crane, with a device for documenting construction sites, configured according to one of the preceding claims.

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