Lifting device

Abstract

To provide a lifting device capable of accurately comprehending abnormalities based on the operating state of the lifting device and advantageous for stable and efficient operation of the lifting device.SOLUTION: A lifting device 14 includes an operating state detection unit 28 for detecting its operating state. A central control unit 32 is configured to cause an output device to output the detected operating state, determine whether the operating state of the lifting device 14 is normal or abnormal based on the detected operating state and predetermined judgment conditions, and when the operating state of the lifting device 14 is determined as abnormal, notify an alert. By the alarm, the occurrence of an abnormality in the operating state of the lifting device 14 can be comprehended. Since the operating state can be accurately recognized based on the operation state output from the output device, the lifting device 14 can be swiftly restored to normal operation by investigating the cause of the abnormality and adjusting and repairing the lifting device 14.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a lifting device used for construction work, repair work, demolition work, etc. of building structures. 【Background Art】 【0002】 In work such as construction, repair, and demolition of building structures, it is necessary to install a scaffold so as to surround the building structure, carry out work using the scaffold, and then disassemble and remove the scaffold, which is costly and prolongs the construction period. Therefore, it has been proposed to use a lifting device instead of a scaffold. That is, the lifting device includes a plurality of guide rods arranged at intervals along the outer periphery of the building structure and extending in the vertical direction, lifting jacks provided on each of the guide rods and capable of lifting and lowering along each guide rod by the telescopic operation of a hydraulic cylinder, and a lifting platform supported by each lifting jack and disposed opposite to the peripheral surface of the building structure. The lifting platform is lifted and lowered by controlling the supply and discharge of hydraulic oil to the hydraulic cylinder of each lifting jack (see Patent Document 1). The lifting platform is a place where workers board and perform work on the building structure, and is also a place for loading equipment, materials, etc. used for work. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 03-144068 【Patent Document 2】 Japanese Patent Application Laid-Open No. 07-268814 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 When operating the lifting device, the operators and those actually riding on the platform will monitor the device's operation. If any abnormality is detected, the operation of the lifting device will be temporarily stopped, and repairs or adjustments will be made to the device. Therefore, there are concerns that differences in the experience of the workers may lead to delays in recognizing abnormalities in the operation of the lifting device, or that abnormalities may be overlooked, resulting in the lifting device malfunctioning. There is room for improvement in ensuring the stable and efficient operation of the lifting device. The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a lifting device that can accurately grasp abnormalities based on the operating state of the lifting device and is advantageous for stable and efficient operation of the lifting device. [Means for solving the problem] 【0005】 To achieve the above-mentioned objectives, one embodiment of the present invention provides a lifting device comprising: a plurality of guide rods arranged at intervals along the outer circumference of a building structure and extending vertically; a lifting jack provided on each of the guide rods and capable of moving up and down along each of the guide rods by a hydraulic cylinder; a lifting platform supported by each of the lifting jacks and positioned opposite to the circumferential surface of the building structure; a hydraulic control unit provided on each of the lifting jacks for controlling the supply and discharge of hydraulic fluid to the hydraulic cylinder; and a central control unit for controlling each of the hydraulic control units, wherein the lifting device has an operating state detection unit for detecting the operating state of the lifting device, and the central control unit is characterized by comprising: an operating state output unit for outputting the detected operating state to an output device; an operating state determination unit for determining whether the operating state of the lifting device is normal or abnormal based on the detected operating state and predetermined determination conditions; and an alarm notification unit for notifying an alarm when the operating state determination unit determines that the operating state of the lifting device is abnormal. Furthermore, in one embodiment of the present invention, the operating state detection unit is characterized in that it includes a load detection unit provided for each guide rod, which detects the load applied to the guide rod as the operating state. Furthermore, in one embodiment of the present invention, the operating state detection unit is characterized by comprising an oil temperature detection unit that detects the oil temperature of the hydraulic fluid as the operating state. Furthermore, in one embodiment of the present invention, the operating state detection unit is characterized by comprising a hydraulic pressure detection unit that detects the hydraulic pressure of the hydraulic fluid as the operating state. Furthermore, in one embodiment of the present invention, the operating state detection unit includes a temperature detection unit that detects the ambient temperature around the lifting jack as the operating state, and the operating state determination unit is characterized in that it sets the determination conditions more strictly as the ambient temperature rises. Furthermore, in one embodiment of the present invention, the operating state detection unit is characterized by comprising a vibration detection unit that detects vibrations generated from the lifting jack as the operating state. Furthermore, in one embodiment of the present invention, the operating state detection unit is characterized by comprising a noise detection unit that detects noise generated from the lifting jack as the operating state. Furthermore, one embodiment of the present invention is characterized in that the central control unit includes a database unit that records the operating state and whether or not the alarm has been sounded in chronological order as operating state history information. Furthermore, in one embodiment of the present invention, the central control unit is characterized by comprising a determination condition modification unit that receives the content of the modification of the determination condition and modifies the determination condition. [Effects of the Invention] 【0006】 According to one embodiment of the present invention, an operating state detection unit is provided to detect the operating state of the lifting device, the detected operating state is output to an output device, and it is determined whether the operating state of the lifting device is normal or abnormal based on the detected operating state and predetermined determination conditions, and an alarm is sounded if it is determined that the operating state of the lifting device is abnormal. Therefore, the alarm accurately recognizes when an abnormality occurs in the operation of the lifting device, and the operation status can be accurately grasped based on the operation status output from the output device. As a result, the cause of the abnormality can be investigated and the lifting device can be adjusted or repaired to quickly restore it to a normal operating state. Therefore, the operation of the lifting device can be carried out stably and efficiently without being affected by differences in the experience of workers, as in the past. This is advantageous in rationalizing work on building structures using lifting devices and reducing costs. Furthermore, if the system is equipped with a load detection unit provided for each guide rod, which detects the load applied to the guide rod as the operating state, it is advantageous for accurately understanding the operating state of the lifting device based on the load on the guide rods. Furthermore, if the operating state detection unit includes an oil temperature detection unit that detects the oil temperature of the hydraulic fluid as the operating state, it is advantageous for accurately understanding the operating state of the lifting device based on the oil temperature of the hydraulic fluid. Furthermore, if the system is equipped with a hydraulic pressure detection unit that detects the hydraulic pressure of the hydraulic fluid as the operating state, it is advantageous for accurately understanding the operating state of the lifting device based on the hydraulic pressure of the hydraulic fluid. Furthermore, by providing a temperature detection unit as the operating state detection unit, which detects the ambient temperature around the lifting jack as the operating state, and by setting stricter judgment conditions as the temperature rises using the operating state determination unit, it becomes possible to determine abnormalities in the operating state early based on operating states that are susceptible to temperature, which is advantageous in accurately understanding the operating state of the lifting device. Furthermore, if the system is equipped with a vibration detection unit that detects vibrations generated from the lifting jacks as the operating state, it will be advantageous in accurately understanding the operating state of the lifting device based on the vibrations of the lifting jacks. Furthermore, if the system is equipped with a noise detection unit that detects noise generated from the lifting jacks as an operating state, it will be advantageous in accurately understanding the operating state of the lifting device based on the noise from the lifting jacks. Furthermore, if the system is equipped with a database unit that records the operating status and whether or not an alarm was sounded in chronological order as operating status history information, it is advantageous to analyze the relationship between the operating status and whether or not an alarm was sounded in past elevators based on the operating status history information read from the database unit, and to repeatedly modify the judgment conditions based on the analysis results, thereby making the judgment conditions more appropriate over time and ensuring that alarms are sounded appropriately. In addition, if a determination condition modification unit that receives the content of the modification of the determination condition and modifies the determination condition is provided, it is advantageous for easily modifying the determination condition and for appropriately performing the warning notification. 【Brief Description of the Drawings】 【0007】 [Figure 1] It is a block diagram showing the configuration of the control system of the lifting device according to the embodiment. [Figure 2] It is a block diagram showing the hardware configuration of the central control unit. [Figure 3] It is a flowchart showing the operation of the lifting device according to the embodiment. [Figure 4] It is a plan view showing the state where the lifting device according to the embodiment is installed on the outer periphery of a building structure. [Figure 5] It is a view taken along the line A-A of FIG. 4, showing the state where the lifting platform is in a low position. [Figure 6] It is a view taken along the line B-B of FIG. 4, showing the state where the lifting platform is in a low position. [Figure 7] It is a view taken along the line A-A of FIG. 4, showing the state where the lifting platform has risen. [Figure 8] It is a view taken along the line B-B of FIG. 4, showing the state where the lifting platform has risen. [Figure 9] It is a front view showing the configuration of the anti-sway part. 【Embodiments for Carrying Out the Invention】 【0008】 Hereinafter, the lifting device according to the embodiment of the present invention will be described with reference to the drawings. In this embodiment, the case where the lifting device is used for the renovation work of an existing building structure will be described. Note that the lifting device of the present invention is not limited to the renovation work of building structures, and it can of course also be applied to the construction work and demolition work of building structures. 【0009】 First, the building structure 10 to which the lifting device is applied will be described. As shown in FIGS. 4 to 6, in this embodiment, a case where the building structure 10 is a high-rise building with a rectangular cross-section will be described. Note that the cross-sectional shape of the building structure 10 is not limited, and the lifting device of the present invention is applicable to building structures 10 with various conventionally known cross-sectional shapes. The building structure 10 has a peripheral surface. In this embodiment, the peripheral surface includes a pair of long-side side surfaces 1002 corresponding to the pair of long sides of the rectangle, and a pair of short-side side surfaces 1004 corresponding to the pair of short sides of the rectangle. Each side surface 1002, 1004 is composed of a flat surface having a vertical height and a width orthogonal to the height, and glass windows (not shown) are provided on each side surface 1002, 1004. In the figure, the symbol G indicates the ground. 【0010】 As shown in FIGS. 4 to 6, the lifting device 14 includes a lifting platform 16, a lifting part 18, a swing prevention part 20 (FIG. 9), and as shown in FIG. 1, each operation state detection part 28 described later, a central control part 32, and a hydraulic control part 30. The lifting platform 16 is a place where workers board to perform renovation work on the building structure 10, and is also a place to load equipment and materials used for the renovation work. Note that the renovation work includes conventionally known work such as repair of damaged parts of the outer wall of the building structure 10 and painting of the outer wall. The lifting platform 16 is arranged to face the peripheral surface of the building structure 10. In this embodiment, the lifting platform 16 has a rectangular frame shape in plan view surrounding the entire periphery of the peripheral surface of the building structure 10. In this embodiment, the lifting platform 16 includes a rectangular frame-shaped bottom wall 1602 and side walls 1604 standing from the outer edge of the bottom wall 1602. As shown in FIG. 4, an opening 1606 that is slightly larger than the cross-sectional shape of the building structure 10 is formed by the inner edge of the bottom wall 1602, and a gap S with a predetermined dimension is secured between the inner edge of the bottom wall 1602 and the outer periphery of the building structure 10. 【0011】 As shown in Figures 4 to 6, the lifting section 18 raises and lowers the lifting platform 16 along the building structure 10. The lifting section 18 is composed of a plurality of guide rods 22 and a plurality of lifting jacks 24. The guide rods 22 are installed at intervals along the outer perimeter of the building structure 10 on the ground G (or on the foundation of the building structure 10) using a rod base (not shown) as a base, and each guide rod 22 extends vertically through a through hole 1608 (see Figures 5 and 6) provided in the bottom wall 1602 of the lifting platform 16. In this embodiment, as shown in Figure 4, four guide rods 22 are provided at equal intervals along each of the pair of long side surfaces 1002 of the building structure 10. Each guide rod 22 has a male threaded end and a female threaded end, and is designed so that guide rods 22 can be added in the axial direction by fastening the female threaded end of one guide rod 22 to the male threaded end of another guide rod 22. Each guide rod 22 has a male threaded end and a female threaded end, and is designed so that guide rods 22 can be added in the axial direction by fastening the female threaded end of one guide rod 22 to the male threaded end of another guide rod 22. Alternatively, both ends of each guide rod 22 can be made into male threaded portions, and the male threaded portions can be fastened together via a connecting jig with a female thread, allowing the guide rods 22 to be extended axially. Therefore, the overall length of the multiple guide rods 22, which are joined together in units of guide rod 22, can be increased, and the overall length of the multiple guide rods 22 can be shortened by removing the guide rods 22 that have been joined together. The extension and removal of the guide rod 22 is performed by a worker standing on the lifting platform 16. By increasing or decreasing the length of the guide rod 22 in this way, the range of movement in the height direction of the lifting platform 16, which is raised and lowered by the lifting jack 24, can be changed. Furthermore, as shown in Figure 6, each guide rod 22 is detachably attached to the outer circumference of the building structure 10 via stays 26 provided at equal intervals in the axial direction of the guide rod 22 in order to prevent buckling. 【0012】 The lifting jacks 24 are provided on the underside of the bottom wall 1602 of the lifting platform 16, one for each through hole 1608, and are connected to each guide rod 22. The lifting jack 24 includes a holding means (not shown) that holds the vertical position of the guide rods 22 which are spaced apart vertically, and a hydraulic cylinder 2402 (see Figure 1). The hydraulic cylinder 2402 extends and retracts as hydraulic fluid is supplied and discharged by a hydraulic control unit 30, which will be described later and is provided for each lifting jack 24. This allows the upper and lower holding means to grip and release the guide rod 22, and to change the vertical distance between the upper and lower holding means. Through the extension and retraction of the hydraulic cylinder 2402, the lifting platform 16 is raised and lowered along each guide rod 22 while being supported by each lifting jack 24. The amount the lifting platform 16 rises with one extension of the lifting jack 24, and the amount the lifting platform 16 falls with one contraction of the lifting jack 24, is, for example, 10 cm. By repeating this extension and retraction of the lifting jack 24, the lifting platform 16 rises or falls like an inchworm. The operation of each lifting jack 24 is controlled by a central control unit (computer) 32, which will be described later, located at a location away from the lifting unit 18, for example, on the ground or in the building structure 10. 【0013】 As shown in Figure 9, the anti-sway section 20 prevents the lifting platform 16 from swaying laterally due to strong winds, earthquakes, etc. Note that the anti-sway section 20 is not shown in Figures 4-8. Multiple bracing sections 20 are provided at intervals along the opening 1606. In this embodiment, three bracing sections 20 are provided for each of the pair of long side surfaces 1002 of the building structure 10, and two bracing sections are provided for each of the pair of short side surfaces 1004. The anti-vibration section 20 comprises an arm 2002 and a roller 2004 provided at the tip of the arm 2002. The arm 2002 is made of, for example, a structural steel and is attached to the lower surface of the bottom wall 1602 by fastening members such as bolts, with its longitudinal direction oriented perpendicular to the long side surface 1002 or the short side surface 1004. The roller 2004 is rotatably supported at the tip of the arm 2002 via a bracket 2006, with its axis of rotation oriented horizontally, and the circumferential surface of the roller 2004 is capable of contacting the long side surface 1002 or the short side surface 1004. Therefore, when the lifting platform 16 is raised or lowered by the lifting jack 24, the rollers 2004 of each anti-sway part 20 roll while in contact with the long side surface 1002 or the short side surface 1004 of the building structure 10, thereby restricting the lateral sway of the lifting platform 16 and ensuring that the lifting and lowering of the lifting platform 16 is performed stably. Alternatively, the arm portion of the arm 2002 that supports the bracket 2006 may be provided so as to be able to extend and retract relative to the rest of the arm 2002, and the arm portion may be biased by a coil spring to constantly extend in a direction, so that the roller 2004 follows the irregularities of the circumferential surface (long side surface 1002 or short side surface 1004) of the building structure 10. In this case, it is advantageous to ensure that the lateral sway of the lifting platform 16 is reliably controlled by the sway-preventing portion 20. Furthermore, the anti-sway section 20 only needs to be able to restrict the lateral sway of the lifting platform 14, and various conventionally known configurations can be adopted. For example, a sway-preventing rail extending vertically along the circumferential surface of the building structure 10 may be provided, and the sway-preventing section 20 may be provided with multiple rollers that engage with the rail and roll. In this case, if a sway-preventing rail for a glass window cleaning gondola that moves up and down along the circumferential surface of the building structure 10 is already provided, this rail can be used. 【0014】 Next, the configuration of the control system for the lifting device 14 will be described. As shown in Figure 1, the lifting device 14 is composed of an operating state detection unit 28, a hydraulic control unit 30, a central control unit 32, a speaker 34, and a display unit 36. 【0015】 The operating state detection unit 28 detects the operating state of the lifting device 14. In this embodiment, the operating state detection unit 28 includes a load detection unit 28A, an air temperature detection unit 28B, an oil temperature detection unit 28C, an oil pressure detection unit 28D, a vibration detection unit 28E, and a noise detection unit 28F. A load detection unit 28A is provided for each guide rod 22 and detects the load applied to the guide rod 22 as the operating state. For example, a sensor such as a load cell can be used as the load detection unit 28A. The temperature detection unit 28B detects the ambient temperature around the lifting jack 24 as its operating state, and a conventionally known temperature sensor can be used as the temperature detection unit 28B. In this embodiment, we will describe a case where a single temperature detection unit 28B is provided on the ground around the building structure 10, assuming that the temperature variation near each lifting jack 24 is not very large. Furthermore, the temperature detection unit 28B may be provided near each lifting jack 24, in which case it is advantageous for precisely detecting the temperature near each lifting jack 24. The oil temperature detection unit 28C is provided for each lifting jack 24 and detects the oil temperature of the hydraulic fluid supplied to and discharged from the hydraulic cylinder 2402 of the lifting jack 24 as the operating state. Conventional known temperature sensors can be used as the oil temperature detection unit 28C. The hydraulic pressure detection unit 28D is provided for each lifting jack 24 and detects the hydraulic pressure of the hydraulic fluid supplied to and discharged from the hydraulic cylinder 2402 of the lifting jack 24 as the operating state. Conventional known liquid pressure sensors can be used as the hydraulic pressure detection unit 28D. The vibration detection unit 28E is provided for each lifting jack 24 and detects vibrations generated from the lifting jack 24 as an operating state; conventionally known vibration sensors can be used. The noise detection unit 28F is provided for each lifting jack 24 and detects the noise generated from the lifting jack 24 as an operating state; conventionally known noise sensors can be used. In Figure 1, the dashed lines indicate the operation detection unit groups, each consisting of an oil temperature detection unit 28C, a hydraulic pressure detection unit 28D, a vibration detection unit 28E, and a noise detection unit 28F, which are provided for each lifting jack 24. Furthermore, in this embodiment, we will describe a case where the operating state detection unit 28 includes a load detection unit 28A, an air temperature detection unit 28B, an oil temperature detection unit 28C, an oil pressure detection unit 28D, a vibration detection unit 28E, and a noise detection unit 28F, but some of these may be omitted. Furthermore, a separate operating state detection unit may be provided; in short, the operating state detection unit only needs to be capable of detecting the operating state of the lifting device 14 as some kind of physical quantity. 【0016】 The hydraulic control unit 30 is provided for each lifting jack 24 and controls the supply and discharge of hydraulic fluid to the hydraulic cylinder 2402 based on control instructions given by the central control unit 32, which will be described later. 【0017】 As shown in Figure 2, the central control unit 32 is configured, for example, by a personal computer (information processing device). The central control unit 32 consists of a CPU 38 and a ROM (Read Only Memory) 40, RAM (Random Access Memory) 42, HDD (Hard Disk Drive) 44, mouse (input device) 46, keyboard (input device) 48, display (output device) 50, printer (output device) 52, external storage device 54, communication unit 56, interface 58, etc., all connected via a bus line. 【0018】 ROM40 stores and stores various types of data. RAM42 provides the working area for CPU38. HDD44 stores control programs and various data executed by CPU38. The mouse 46 and keyboard 48 constitute an input device that accepts input operations. The input device may also consist of a touch panel provided on the display surface of the display device 46, and various conventionally known input devices can be used as input devices. The display 50 constitutes an output device that displays characters and images, and is composed of a flat panel display 50 such as a liquid crystal display device. The printer 52 is an output device that prints text and images onto a printing medium. The external storage device 54 is an external storage device such as a memory card or USB memory stick. The communications unit 56 communicates with terminal devices not shown in the diagram via the internet or a dedicated communication line. Interface 58 provides interfaces with each of the state detection units described above, as well as peripheral devices such as the speaker 34 and display unit 36 ​​shown in Figure 1. Furthermore, the CPU 38, by executing the above control program, realizes the lifting control unit 59, operation status output unit 60, operation status determination unit 62, alarm notification unit 64, database unit 66, and determination condition modification unit 68 shown in Figure 1. 【0019】 The lifting control unit 59 provides each hydraulic control unit 30 with control information for the supply and discharge of hydraulic fluid to the hydraulic cylinder 2402. For example, in response to a single operation input made by a mouse 46 or keyboard 48, control information for supplying and discharging hydraulic fluid necessary to extend or retract each lifting jack 24 by one cycle is generated and provided to each hydraulic control unit 30. Alternatively, instead of the mouse 46 and keyboard 48, an upward operation switch, which is operated to extend the lifting jack 24 by one cycle, and a downward operation switch, which is operated to retract the lifting jack 24 by one cycle, may be provided, and the lifting control unit 59 may generate the above-mentioned control information in response to the operation of these switches. Although not shown in the diagram, the lifting platform 16 is equipped with a tilt detection unit that detects the tilt of the lifting platform 16. The lifting control unit 59 generates the above-mentioned control information based on the detection result detected by the tilt detection unit, so that the lifting platform 16 moves up and down while maintaining a horizontal position, and provides this information to each hydraulic control unit 30. Since this type of control is the same as that of conventional lifting devices, a detailed explanation will be omitted. Furthermore, as with conventional methods, various commercially available tilt sensors that are known to be used may be used as the tilt detection unit, or a system may be used in which a water pipe connected to a water tank is extended along the bottom wall 1602 of the lifting platform 16, and multiple level gauges are installed along the water pipe, and the tilt of the lifting platform 16 is detected based on the height of the liquid level detected by each of these level gauges. 【0020】 The operation status output unit 60 outputs and displays the operation status detected by the operation detection unit on the display 50, which is an output device. Alternatively, the operation status output unit 60 may print the operation status to the printer 52, which is an output device. The detected operating status may be displayed in a table format, correlating the above-mentioned values ​​for temperature, oil temperature, oil pressure, vibration, and noise with the time at which those values ​​were detected. Alternatively, it may be displayed in a graph format with time on the horizontal axis and the values ​​on the vertical axis. The method of displaying the operating status is arbitrary. 【0021】 The operating state determination unit 62 determines whether the operating state of the lifting device 14 is normal or abnormal based on the detected operating state and predetermined determination conditions. The following provides a detailed explanation. The determination conditions for the load (operating state) detected by the load detection unit 28A are, for example, whether or not the load applied to each guide rod 22 is within the allowable load range defined by the lower limit and upper limit. Such allowable load ranges are set, for example, taking into consideration the strength and durability of the guide rod 22. Furthermore, as a condition for determining the load, the difference between the minimum and maximum load values ​​of each guide rod 22 detected by each load detection unit 28A may be calculated as the load difference, and a condition may be added to determine whether or not this load difference is within the allowable load difference range defined by the lower and upper limits. Such a permissible load difference range is set, for example, by considering how much variation in the load applied to the multiple guide rods 22 is acceptable. 【0022】 The determination conditions for the hydraulic pressure (operating state) of the hydraulic fluid detected by the hydraulic pressure detection unit 28D are, for example, whether or not the hydraulic pressure of the hydraulic fluid supplied to the hydraulic cylinder 2402 of each lifting jack 24 is within the allowable hydraulic pressure range defined by a lower limit and an upper limit. Such permissible hydraulic pressure ranges are set, for example, taking into consideration the specifications, performance, and durability of the hydraulic cylinder 2402. Furthermore, as a determination criterion for hydraulic pressure, the difference between the minimum and maximum hydraulic pressure of each guide rod 22 detected by each hydraulic pressure detection unit 28D may be calculated as the hydraulic pressure difference, and a determination criterion may be added to determine whether or not this hydraulic pressure difference is within the allowable hydraulic pressure difference range defined by the lower limit and upper limit. Such an allowable hydraulic pressure difference range is set, for example, by considering the extent to which hydraulic pressure variation in the hydraulic cylinders 2402 of multiple lifting jacks 24 is acceptable. 【0023】 The determination conditions for the hydraulic fluid temperature (operating state) detected by the oil temperature detection unit 28C are, for example, whether or not the hydraulic fluid temperature supplied to the oil temperature cylinder of each lifting jack 24 is within the allowable oil temperature range defined by a lower limit and an upper limit. Such permissible oil temperature ranges are set, for example, taking into consideration the specifications, performance, and durability of the hydraulic cylinder 2402. Furthermore, as a determination criterion for oil temperature, the difference between the minimum and maximum oil temperatures of each guide rod 22 detected by each oil temperature detection unit 28C may be calculated as the oil temperature difference, and a determination criterion may be added to determine whether or not this oil temperature difference is within the allowable oil temperature difference range defined by the lower limit and upper limit. Such an allowable oil temperature difference range is set, for example, by considering the extent to which variations in oil temperature in the hydraulic cylinders 2402 of multiple lifting jacks 24 are acceptable. 【0024】 Furthermore, the determination conditions for the temperature (operating state) detected by the temperature detection unit 28B are, for example, whether or not the temperature is within the permissible temperature range defined by the lower limit and upper limit. For example, if the temperature of the air surrounding the building structure 10 becomes extremely low or extremely high due to severe weather conditions, the hydraulic pressure and oil temperature of the hydraulic fluid may fall outside the range that guarantees the normal operation of the hydraulic cylinder 2402, or the hydraulic pressure and oil temperature of the hydraulic fluid may fall outside the range that ensures the durability of the hydraulic cylinder 2402. Therefore, the criterion of whether or not the temperature is within the permissible temperature range is considered effective in safely and efficiently operating the lifting device 14. Furthermore, since the aforementioned oil pressure and oil temperature are affected by ambient temperature, the criteria for determining oil pressure (allowable oil pressure range) and oil temperature (allowable oil temperature range) may be changed according to the ambient temperature. Specifically, the operating state determination unit 62 sets stricter conditions for determining hydraulic pressure (allowable hydraulic pressure range) and oil temperature (allowable oil temperature range) as the ambient temperature rises. For example, the operating state determination unit 62 is set so that the upper limit of the allowable hydraulic pressure range decreases as the ambient temperature rises, or so that the upper limit of the allowable oil temperature range decreases as the ambient temperature rises. This approach is advantageous in detecting an abnormality in the lifting device 14 at an earlier stage, especially when rising ambient temperatures tend to increase the hydraulic pressure and oil temperature of the hydraulic fluid. 【0025】 The determination criteria for the vibration (operating state) of the lifting jacks 24 detected by the vibration detection unit 28E are, for example, whether or not the vibration of each lifting jack 24 is within the permissible vibration range defined by the lower limit and upper limit. Such permissible vibration ranges are set, for example, taking into consideration the specifications, performance, and durability of the lifting jack 24, including the hydraulic cylinder 2402. 【0026】 The determination criteria for the noise (operating state) of the lifting jacks 24 detected by the noise detection unit 28F are, for example, whether or not the noise of each lifting jack 24 is within the permissible noise range defined by a lower limit and an upper limit. Such permissible noise ranges are set, for example, taking into consideration the specifications, performance, and durability of the lifting jack 24, including the hydraulic cylinder 2402. 【0027】 Furthermore, if the vibrations and noises described above are expected to change due to the influence of temperature, the operating state determination unit 62 may be set so that the upper limits of the permissible vibration range and permissible noise range decrease as the temperature rises, or so that the upper limits of the permissible vibration range and permissible noise range decrease as the temperature rises. 【0028】 The alarm notification unit 64 issues an alarm when the operating state determination unit 62 determines that the operating state of the lifting device 14 is abnormal. In this embodiment, the alarm notification unit 64 generates an alarm sound and an announcement indicating an alarm from the speaker 34, and the alarm notification unit 64 also displays an alarm indication comment from the display unit 36. 【0029】 Here, the speaker 34 can be, for example, placed in the same location as the central control unit 32 and capable of generating sound for the operator of the lifting device 14. Furthermore, the display unit 36 ​​only needs to be located where the central control unit 32 is installed and capable of providing a display output that can be seen by the operator of the lifting device 14, and can be made up of a commercially available display 50 or the like. Furthermore, the display unit 36 ​​may also be one that uses a patrol light (registered trademark) or a warning light to signal an alarm, and the configuration of the display unit 36 ​​is not limited. Furthermore, the announcements emitted from the speaker 34 and the comments displayed from the display unit 36 ​​may include content indicating which of the detected operating states does not meet the judgment criteria. This allows the worker who recognizes the alarm to immediately understand what operational condition was judged to be abnormal, which is advantageous for quickly carrying out recovery work such as stopping the lifting device 14 and adjusting the lifting device 14 so that its operational condition meets the judgment conditions. 【0030】 The database unit 66 records the operating status and whether or not an alarm was sounded in chronological order as operating status history information, and the operating status history information is associated with the year, month, and day and time. The operating status history information is recorded in a storage device such as a hard disk drive 44 or an external storage device 54. This operation of recording operational status history information to the database unit 66 is performed regularly (at regular intervals) while the lifting device 14 is in operation. Therefore, based on the operating status history information read from the database unit 66, it is possible to analyze the relationship between the past operating status of the lifting device 14 and whether or not an alarm was sounded. 【0031】 The determination condition modification unit 68 receives the modification details of the determination conditions from the operation state determination unit 62 and modifies the determination conditions. For example, based on the operating state history information read from the database unit 66, the relationship between the past operating state of the lifting device 14 and whether or not an alarm was sounded is analyzed. If it is determined that the judgment conditions are too strict and alarms are being sounded unnecessarily even though the abnormality in the operating state is minor, the judgment conditions are modified to loosen them. The modified conditions are then provided to the judgment condition modification unit 68, for example, from an input device such as a keyboard 48 or mouse 46, thereby modifying the judgment conditions of the operating state judgment unit 62. Conversely, if the judgment criteria are too lenient and it is believed that an alarm has not been issued despite a severe abnormality in the operating state, the judgment criteria of the operating state judgment unit 62 are modified by correcting the judgment criteria to make them stricter and providing the modified information to the judgment condition correction unit 68 from the input device. A minor malfunction indicates a low need for adjustment or repair of the lifting device 14, while a severe malfunction indicates a high need for adjustment or repair of the lifting device 14. 【0032】 Next, we will explain how to use the lifting device 14. As shown in Figures 4, 5, and 6, the lifting platform 16 is assembled on the ground G surrounding the outer perimeter of the building structure 10. Next, using heavy machinery such as a crane (not shown), the lifting platform 16 is lifted and positioned parallel to the horizontal plane at a predetermined distance above the ground G, while multiple guide rods 22 are installed on the ground G and each guide rod 22 is connected to the lifting jack 24. At this time, the installed guide rod 22 is inserted from the lifting jack 24 through the through hole 1608 in the bottom wall 1602 of the lifting platform 16, so that the roller 2004 of the sway-preventing section 20 can come into contact with the circumferential surface of the building structure 10. Then, multiple points on each guide rod 22, spaced equally in the axial direction, are detachably attached to the outer circumference of the building structure 10 via stays 26. As a result, the lifting platform 16 comes into contact with the building structure 10 via multiple anti-sway parts 20, making it impossible for it to move horizontally, thus suppressing lateral sway caused by strong winds or earthquakes. 【0033】 Once the lifting jacks 24 are connected to the guide rods 22, and the lifting platform 16 is supported on the ground G via each lifting jack 24 and each guide rod 22, the heavy machinery is detached from the lifting platform 16, and the lifting platform 16 is made capable of moving up and down by the operation of the lifting jacks 24. Then, through the operation of an input device by a worker (mouse 46, keyboard 48, or dedicated lifting operation button), control information is provided from the lifting control unit 59 to each hydraulic control unit 30, causing each hydraulic control unit 30 to operate in such a way that each lifting jack 24 raises the lifting platform 16. This allows the lifting platform 16 to be raised to the height required for the work, and then the lifting jack 24 is stopped to determine the height position of the lifting platform 16. In this process, as the lifting platform 16 rises or falls, the rollers 200430 of the anti-sway section 20 roll on the surface of the building structure 10, allowing the lifting platform 16 to rise smoothly. Once the height of the lifting platform 16 has been determined, the worker who boards the lifting platform 16 performs the renovation work over a certain range in the vertical direction of the building structure 10 that can be worked on from the height of the lifting platform 16. 【0034】 Once the workers have completed work on a certain area of ​​the building structure 10, the lifting platform 16 is raised by the extension of the lifting jack 24 so that work on the next area can be performed. After determining the height of the lifting platform 16, the workers carry out the renovation work. 【0035】 Furthermore, if it is necessary to extend the guide rods 22 to raise the lifting platform 16 further, additional guide rods 22 are attached to each guide rod 22 as shown in Figures 7 and 8, and the extended guide rods 22 are detachably attached to the outer circumference of the building structure 10 via stays 26. 【0036】 By repeatedly raising the lifting platform 16 and adding extensions to the guide rods 22, the lifting platform 16 is raised from the lower part of the building structure 10 towards the upper part, while the renovation work on the building structure 10 is carried out. 【0037】 Eventually, the lifting platform 16 reaches a height corresponding to the top of the building structure 10. Once the renovation work at the highest point of the building structure 10 is completed, the worker operates an input device (mouse 46, keyboard 48, or a dedicated lowering button) to provide control information from the lifting control unit 59 to each hydraulic control unit 30. Each hydraulic control unit 30 then operates each lifting jack 24 to lower the lifting platform 16, while simultaneously removing the extended guide rods 22 one by one and retrieving them onto the lifting platform 16. Furthermore, the stays 26 that connected the guide rod 22 to be removed and the building structure 10 are removed one by one and collected on the lifting platform 16. In this manner, the lifting platform 16 is lowered while the guide rod 22 and stay 26 are retrieved. 【0038】 Once the lifting platform 16 has descended to its lowest position, for example, above ground level G, and all the guide rods 22 and stays 26 have been recovered, the guide rods 22 and stays 26 are carried out from the lifting platform 16, the lifting platform 16 is removed, and the renovation work is completed. In this embodiment, we have described the case in which renovation work on the building structure 10 is carried out while moving the lifting platform 16 upwards towards the building structure 10. However, when demolition work is carried out on the building structure 10, the lifting platform 16 should be raised to a height corresponding to the top of the building structure 10, and then lowered as the work progresses. 【0039】 Next, the operation of the control system of the lifting device 14 will be explained with reference to the flowchart in Figure 3. In the following explanation, the operator of the central control unit 32 will be referred to as a worker. While the lifting device 14 is in operation, the load detection unit 28A, air temperature detection unit 28B, oil temperature detection unit 28C, hydraulic pressure detection unit 28D, vibration detection unit 28E, and noise detection unit 28F each detect the operating state of the lifting device 14, including load, air temperature, oil temperature, hydraulic pressure, vibration, and noise (step S10). The central control unit 32 outputs each detected operating state to the display 50 (step S12: operating state output unit 60). Next, the central control unit 32 determines whether each detected operating state satisfies predetermined determination conditions (Step S14: Operating state determination unit 62). If step S14 is affirmative, return to step S10. If step S14 is negative, an alarm is sounded by the speaker 34 and the display unit 36 ​​(step S16: alarm notification unit 64). Next, upon recognizing the alarm, the worker instructs the central control unit 32 to stop the lifting operation of the lifting device 14, thereby stopping the lifting device 14 (step S18). Then, the worker checks the operating status displayed on the display 50, determines which of the detected operating statuses does not meet the judgment conditions, and adjusts the lifting device 14 (step S20). For example, if the load does not meet the criteria, check for any abnormalities in the guide rod 22 or tilting of the lifting platform 16, and then adjust or repair the guide rod 22. Furthermore, if the hydraulic pressure, oil temperature, vibration, and noise levels do not meet the criteria, check for malfunctions in the lifting jack 24 and tilting of the lifting platform 16, and then adjust or repair the lifting jack 24. Furthermore, if the announcements emitted from the speaker 34 and the comments displayed from the display unit 36 ​​contain content indicating which of the detected operating states does not meet the judgment conditions, the lifting device 14 may be adjusted based on the content of those announcements and comments. Then, once the adjustment of the lifting device 14 is complete, the worker operates the central control unit 32 to activate the lifting device 14 (step S22), thereby repeating the same control process from step S10. 【0040】 As described above, according to this embodiment, an operating state detection unit 28 is provided to detect the operating state of the lifting device 14, the central control unit 32 outputs the detected operating state to an output device, determines whether the operating state of the lifting device 14 is normal or abnormal based on the detected operating state and predetermined determination conditions, and issues an alarm if it is determined that the operating state of the lifting device 14 is abnormal. Therefore, the alarm allows for accurate recognition of any abnormality in the operation of the lifting device 14, and the operation status can be accurately grasped based on the operation status output from the output device. As a result, the cause of the abnormality can be investigated and the lifting device 14 can be adjusted or repaired to quickly restore it to a normal operating state. Therefore, the operation of the lifting device 14 can be carried out stably and efficiently without being affected by differences in the experience of workers, as in the past, which is advantageous in rationalizing work on building structures 10 using the lifting device 14 and reducing costs. 【0041】 Furthermore, in this embodiment, the operating state detection unit 28 is provided with a load detection unit 28A that is installed for each guide rod 22 and detects the load applied to the guide rod 22 as the operating state. This is advantageous for accurately understanding the operating state of the lifting device 14 based on the load on the guide rod 22. 【0042】 Furthermore, in this embodiment, the operating state detection unit 28 is equipped with an oil temperature detection unit 28C that detects the oil temperature of the hydraulic fluid as the operating state, which is advantageous for accurately understanding the operating state of the lifting device 14 based on the oil temperature of the hydraulic fluid. 【0043】 Furthermore, in this embodiment, the operating state detection unit 28 is equipped with a hydraulic pressure detection unit 28D that detects the hydraulic pressure of the hydraulic fluid as the operating state, which is advantageous for accurately understanding the operating state of the lifting device 14 based on the hydraulic pressure of the hydraulic fluid. 【0044】 Furthermore, in this embodiment, the operating state detection unit 28 is equipped with a temperature detection unit 28B that detects the ambient temperature around the lifting jack 24 as the operating state, and the operating state determination unit 62 sets stricter determination conditions as the temperature rises, so that abnormalities in the operating state can be determined early based on operating states that are susceptible to temperature, which is advantageous in accurately understanding the operating state of the lifting device 14. 【0045】 Furthermore, in this embodiment, the operating state detection unit 28 is equipped with a vibration detection unit 28E that detects vibrations generated from the lifting jack 24 as the operating state, which is advantageous for accurately understanding the operating state of the lifting device 14 based on the vibrations of the lifting jack 24. 【0046】 Furthermore, in this embodiment, the operating state detection unit 28 includes a noise detection unit 28F that detects noise generated from the lifting jack 24 as an operating state, which is advantageous for accurately understanding the operating state of the lifting device 14 based on the noise from the lifting jack 24. 【0047】 Furthermore, in this embodiment, the central control unit 32 includes a database unit 66 that records the operating status and whether or not an alarm was sounded as operating status history information in chronological order. Therefore, based on the operating status history information read from the database unit 66, it is possible to analyze the relationship between the operating status of the elevator 14 in the past and whether or not an alarm was sounded. Therefore, by repeatedly modifying the judgment conditions based on the analysis results, the judgment conditions gradually become more appropriate, and alarms are notified more effectively, which is even more advantageous for efficiently operating the lifting device 14. 【0048】 Furthermore, in this embodiment, the central control unit 32 includes a determination condition modification unit 68 that receives the content of the determination condition modification and modifies the determination condition, which is advantageous in easily modifying the determination condition and in ensuring that alarms are properly notified. 【0049】 In this embodiment, the case in which renovation work on a building structure 10 is performed using the lifting device 14 has been described, but the lifting device 14 of the present invention can also be used to perform demolition work or construction work on a building structure 10. When demolishing the building structure 10, the lifting platform 16 is moved to the top of the building structure 10, and the demolition work is carried out by workers on the lifting platform 16 while the platform 16 is being lowered. Furthermore, when concrete is poured as part of the construction work for the building structure 10, the lifting platform 16 can be raised from the lowest part of the building structure 10, and concrete can be poured sequentially using the formwork installed on the lifting platform 16. Furthermore, the lifting device 14 can be used for various conventionally known applications that were previously carried out by constructing scaffolding, such as using the lifting device 14 to diagnose deterioration or damage to the building structure 10 prior to renovation work. 【0050】 Furthermore, in this embodiment, the case in which the guide rod 22 is erected from the ground G or foundation surrounding the building structure 10 has been described. However, in cases where the steel frame constituting the building structure 10 is constructed first, and then concrete is poured to construct the building structure 10, guide rods 22 may be suspended from rod suspension beams erected on the top of the pre-constructed steel frame around the building structure 10, and lifting jacks 24 may be provided on these suspended guide rods 22 so as to be able to move up and down. [Explanation of Symbols] 【0051】 10 Building structures 1002 Long side side (circumferential surface) 1004 Short side (circumferential surface) 14 Lifting device 16 Elevating platform 1602 Bottom wall 1604 Side wall 1606 Opening 1608 Through hole 18 Lifting section 20. Anti-vibration section 2002 Arm 2004 Laura 2006 bracket 22 Guide Rod 24 Lifting jacks 2402 Hydraulic Cylinder 26 Stay 28 Operating state detection unit 28A Load detection unit 28B Temperature detection unit 28C Oil temperature detection unit 28D Hydraulic detection unit 28E Vibration detection unit 28F Noise detection unit 30 Hydraulic control unit 32 Central Control Unit 34 speakers 36 Display section 38 CPU 40 ROM (Read Only Memory) 42 RAM (Random Access Memory) 44 HDD (Hard Disk Drive) 46. ​​Mouse (Input Device) 48 Keyboards (Input Devices) 50. Display (Output Device) 52 Printer (Output device) 54 External storage device 56 Communications Department 58 Interfaces 59 Lifting control unit 60 Operating status output section 62 Operating state determination unit 64 Warning and Notification Department 66 Database Department 68 Judgment condition correction section

Claims

[Claim 1] Multiple guide rods are arranged at intervals along the outer perimeter of the building structure, extending vertically, Each of the aforementioned guide rods is provided with a lifting jack that can be raised and lowered along each guide rod by a hydraulic cylinder, A lifting platform supported by each of the aforementioned lifting jacks and positioned opposite the circumferential surface of the building structure, Each of the aforementioned lifting jacks is provided with a hydraulic control unit that controls the supply and discharge of hydraulic fluid to the hydraulic cylinder, A central control unit that controls each of the aforementioned hydraulic control units, A lifting device comprising, The lifting device has an operating state detection unit that detects the operating state of the lifting device, The central control unit is An operating state output unit that outputs the detected operating state to an output device, An operating state determination unit that determines whether the operating state of the lifting device is normal or abnormal based on the detected operating state and predetermined determination conditions, The system includes an alarm notification unit that issues an alarm when the operating state determination unit determines that the operating state of the lifting device is abnormal, The operating state detection unit comprises at least one of an oil temperature detection unit that detects the oil temperature of the hydraulic fluid as the operating state, and an oil pressure detection unit that detects the oil pressure of the hydraulic fluid as the operating state. The system further includes a temperature detection unit for detecting the ambient temperature around the lifting jack, The operating state determination unit sets the determination conditions for the oil temperature or oil pressure more strictly as the ambient temperature rises. A lifting device characterized by the following features. [Claim 2] The aforementioned operating state detection unit includes a load detection unit provided for each guide rod, which detects the load applied to the guide rod as the operating state. The lifting device according to claim 1, characterized in that it is a lifting device. [Claim 3] The aforementioned operating state detection unit includes a vibration detection unit that detects vibrations generated from the lifting jack as the operating state. A lifting device according to claim 1 or 2, characterized in that it is a lifting device according to claim 1 or 2. [Claim 4] The aforementioned operating state detection unit includes a noise detection unit that detects noise generated from the lifting jack as the operating state. A lifting device according to any one of claims 1 to 3, characterized by the features described herein. [Claim 5] The central control unit is The system includes a database unit that records the aforementioned operating status and whether or not the alarm was sounded in chronological order as operating status history information. A lifting device according to any one of claims 1 to 4. [Claim 6] The central control unit is The system includes a determination condition modification unit that receives the content of the modification to the determination condition and modifies the determination condition. A lifting device according to any one of claims 1 to 5, characterized by the features described herein.

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