Floor Traffic Light System for Detecting Ground Subsidence

Abstract

The present invention relates to a floor signal light system for detecting ground subsidence, and more specifically, to a floor signal light comprising a protective case, an outer casing, an inner casing, a cover, and a seesaw lever part, and a floor signal light system for detecting ground subsidence that measures the pressure exerted by the ground on the protective case from three pressure sensors installed on the floor signal light, determines that ground subsidence has occurred when the pressure decreases, and notifies the manager thereof.

Description

Technology Field

[0001] The present invention relates to a floor signal light system for detecting ground subsidence, and more specifically, to a floor signal light comprising a protective case, an outer casing, an inner casing, a cover, and a seesaw lever part, and a floor signal light system for detecting ground subsidence that measures the pressure exerted by the ground on the protective case from three pressure sensors installed on the floor signal light, determines that ground subsidence has occurred when the pressure decreases, and notifies the manager thereof. Background Technology

[0003] As urbanization and the complexity of traffic environments increase in modern society, various technologies are being developed to ensure pedestrian safety. One such technology is the ground traffic light, a safety facility embedded in the ground at crosswalk waiting lines that illuminates in synchronization with pedestrian traffic lights to help waiting pedestrians clearly perceive the signal visually. In particular, as the risk of traffic accidents involving so-called "smombies"—people walking while looking at their smartphones—has emerged as a social issue, ground traffic lights are garnering attention as an effective means to prevent signal violations and accidents caused by inattention to the road ahead.

[0004] These conventional ground traffic light technologies have primarily evolved in the direction of improving the accuracy of signal synchronization, ensuring the visibility of the light source, and enhancing durability and waterproofing performance. For example, as disclosed in Korean Registered Patent No. 10-2330579 (Patent Document 0001) “Ground traffic light controlled in conjunction with a pedestrian crossing traffic light and a method of constructing the same,” conventional ground traffic lights place technical emphasis on control technology that accurately turns on and off in accordance with the signal of a pedestrian traffic light, and on methods of implementing a robust structure that prevents damage from vehicle loads or external impacts and efficiently constructing the lights.

[0005] However, conventional technology views ground traffic lights merely as passive structures fixed by simply 'burying' them in the ground, and thus has an inherent limitation in that it cannot actively respond to changes in the ground environment where the facilities are installed. Although invisible, the ground in urban areas continuously changes due to various factors such as fluctuations in groundwater levels, leaks from aging water and sewage pipes, vibrations caused by large-scale construction in adjacent areas, and subway operations; these factors can lead to unexpected ground subsidence or the occurrence of sinkholes.

[0006] Conventional ground traffic lights expose the following problems when such ground subsidence occurs. First, they cannot detect warning signs of safety accidents. Even if the ground begins to subtly subside, ground traffic lights cannot detect any abnormal signs or provide warnings, leaving the risk of a major sinkhole accident unaddressed. Second, the inherent functionality of the facility deteriorates. If the ground subsides unevenly, the structure of the ground traffic light itself tilts or twists. In this case, the direction of the LED light beam shifts, failing to deliver accurate signals to pedestrians, and load concentration on specific areas can lead to cracks or damage. Third, maintenance costs are excessive. Repairing tilted or damaged ground traffic lights requires a complex and costly process involving crushing surrounding asphalt or paving blocks, lifting the entire structure, and re-burying it.

[0007] Therefore, there is a strong need to develop a new intelligent ground traffic light system that can faithfully perform the traffic signal guidance role, which is the inherent function of existing ground traffic lights, while also precisely monitoring the ground conditions at the installation location in real time to detect signs of ground subsidence early, immediately notifying the manager of subsidence to prevent major safety accidents, and easily correcting the tilt of the structure on-site to maximize maintenance convenience. Prior art literature

[0009] Korean Registered Patent KR 10-2330579 (December 1, 2021) The problem to be solved

[0010] The present invention aims to provide a floor signal light system that detects ground subsidence, comprising a floor signal light composed of a protective case, an outer casing, an inner casing, a cover, and a seesaw lever part, and measures the pressure exerted by the ground on the protective case from three pressure sensors installed on the floor signal light, determines that ground subsidence has occurred when the pressure decreases, and notifies the manager thereof. means of solving the problem

[0012] In order to solve the above problems, one embodiment of the present invention provides a floor signal light system for detecting ground subsidence, comprising: a protective case in the form of a container with an open top and an internal receiving space; an outer casing disposed inside the protective case, with an open top and an internal receiving space; an inner casing disposed inside the outer casing and including an LED module that emits light according to an external signal; a cover part including a cover disposed on the upper side of the inner casing; a plurality of seesaw lever parts disposed on the lower side of the outer casing to raise the outer casing in a biased manner; a sensor part including a tilt sensor disposed inside the inner casing and a plurality of pressure sensors disposed on the outer bottom surface of the protective case; a plurality of floor signal lights; and a control part capable of communicating with the sensor part and the LED module via wired or wireless communication. The control part receives tilt information and a plurality of pressure information transmitted from the sensor part and detects subsidence of the ground in which the protective case is buried based on the received tilt information and a plurality of pressure information.

[0013] In some embodiments of the present invention, the control unit receives the tilt information and the plurality of pressure information from the sensor unit according to a preset time interval for each of the plurality of floor signal lights, calculates pressure difference information which is the difference between the preset initial pressure information and the plurality of pressure information according to each of the plurality of pressure sensors, determines whether each of the pressure difference information exceeds a preset normal pressure range, and if the number of pressure information exceeding the normal pressure range among the plurality of pressure information is greater than or equal to a preset threshold number, checks the tilt information at that point in time, and if the tilt information is different from the preset initial tilt information, determines that subsidence has occurred in the ground where the floor signal light to which the plurality of pressure information was transmitted is buried.

[0014] In some embodiments of the present invention, the sensor unit comprises: a tilt sensor disposed inside the inner casing and measuring tilt information, which is the degree to which the bottom surface of the inner casing is tilted with respect to the direction of gravity; a first pressure sensor disposed on the outer bottom surface of the protective case; a second pressure sensor disposed on the outer bottom surface of the protective case at a position different from the first pressure sensor; and a third pressure sensor disposed on the outer bottom surface of the protective case at a position different from the first pressure sensor and the second pressure sensor; wherein the first pressure sensor, the second pressure sensor, and the third pressure sensor can measure the pressure applied by the ground in which the protective case is buried to the bottom surface of the protective case.

[0015] In some embodiments of the present invention, the floor signal light system, wherein the control unit compares the tilt information received from the tilt sensor with preset initial tilt information to determine whether the difference value is within a preset normal tilt range, and if the difference value exceeds the preset normal tilt range, transmits a signal to an external server.

[0016] In some embodiments of the present invention, the seesaw lever portion comprises: a straight seesaw rod disposed in the longitudinal direction of the floor signal light in the protective case; an adjustment bolt, one end of which is connected to one end of the seesaw rod and the other end of which extends to the lower side of the cover; and a lifting rod, one end of which is connected to the other end of the seesaw rod and the other end of which is disposed on the lower side of the outer casing; wherein the seesaw rod is rotatably coupled to a part of the protective case, and the adjustment bolt rises or falls according to the direction of rotation, and when the adjustment bolt falls and applies force to one end of the seesaw rod, the seesaw rod rotates and the other end of the seesaw rod raises the lifting rod, thereby causing the lifting rod to raise the outer casing in a biased manner and adjusting the angle of the outer casing, thereby enabling the response to twisting of the floor signal light caused by ground subsidence.

[0017] In some embodiments of the present invention, the seesaw lever portion further comprises: a partition wall positioned vertically to the ground inside the protective case and having a plurality of through holes; an axle bracket fixed to the lower surface of the partition wall; and a hinge shaft positioned horizontally to the partition wall by penetrating a part of the axle bracket; wherein the hinge shaft penetrates the axle bracket and the seesaw rod simultaneously so that the seesaw rod can rotate about the hinge shaft, the adjusting bolt penetrates the first through hole of the partition wall and is connected to one side of the seesaw rod, and the lifting rod penetrates the second through hole of the partition wall and is connected to the other side of the seesaw rod.

[0018] In some embodiments of the present invention, the seesaw rod further comprises a lowering stopper formed to protrude in the opposite direction of the lifting rod; and the lowering stopper can prevent the lifting rod from descending beyond a preset distance when lowered by the adjustment bolt.

[0019] In some embodiments of the present invention, the cover comprises a plurality of adjustment holes, which are through holes formed at positions corresponding to the adjustment bolt; and the cover portion further comprises a plurality of adjustment doors that open and close the plurality of adjustment holes, so that when adjusting the adjustment bolt, the adjustment bolt can be adjusted by opening only the adjustment doors without removing the cover. Effects of the invention

[0021] According to one embodiment of the present invention, the condition of the ground is monitored in real time through a plurality of pressure sensors and tilt sensors equipped in a ground signal light, and the collected information is comprehensively analyzed to detect the occurrence of ground subsidence at an early stage, thereby achieving the effect of preventing safety accidents.

[0022] According to one embodiment of the present invention, ground subsidence is determined by considering both changes in ground pressure and changes in the inclination of the ground signal light, thereby preventing malfunctions caused by temporary pressure changes such as vehicle traffic or the weight of pedestrians, and enabling the detection of ground abnormalities more accurately and reliably.

[0023] According to one embodiment of the present invention, an error direction vector is calculated based on the error values ​​of pressure information measured by a plurality of pressure sensors, and vector information calculated from a plurality of ground signal lights is combined to achieve the effect of estimating the exact location and scale of ground subsidence.

[0024] According to one embodiment of the present invention, even if the ground signal light tilts due to ground subsidence, the angle of the enclosure can be easily adjusted using a seesaw lever, thereby correcting the twisting and maintaining normal function without the hassle of reinstalling the entire ground signal light.

[0025] According to one embodiment of the present invention, an adjustment door for adjusting the adjustment bolt is separately provided in the cover portion, so that when adjusting the angle, only the relevant part can be opened without the need to detach the entire upper cover, thereby enabling quick and convenient maintenance work.

[0026] According to one embodiment of the present invention, by integrating a ground safety monitoring function into the original function of a ground signal light, which is pedestrian signal guidance, it is possible to efficiently enhance urban safety infrastructure without the additional costs and spatial constraints required to build a separate ground detection system.

[0027] According to one embodiment of the present invention, by transmitting an external notification when a server detects ground subsidence or an abnormal tilt, it is possible to enable rapid recognition of dangerous situations and initial response measures, thereby effectively preventing potential major accidents. Brief explanation of the drawing

[0029] FIG. 1 schematically illustrates an exploded view of a floor signal light according to one embodiment of the present invention. FIG. 2 schematically illustrates a cross-sectional view of a floor signal light according to one embodiment of the present invention. FIG. 3 schematically illustrates a cross-sectional view of a seesaw lever portion according to one embodiment of the present invention. FIG. 4 schematically illustrates a bottom perspective view of a seesaw lever portion according to one embodiment of the present invention. FIG. 5 schematically illustrates a plan view and a cross-sectional view of a cover portion according to an embodiment of the present invention. FIG. 6 schematically illustrates a ground signal light in a normal state without ground subsidence according to one embodiment of the present invention. FIG. 7 schematically illustrates a floor signal light in which ground subsidence has occurred according to one embodiment of the present invention. FIG. 8 schematically illustrates a floor signal light adjusted in response to ground subsidence through a seesaw lever part after ground subsidence according to one embodiment of the present invention. FIG. 9 schematically illustrates a block diagram of a floor signal light system according to one embodiment of the present invention. FIG. 10 schematically illustrates a block diagram of a floor signal light system according to another embodiment of the present invention. FIG. 11 schematically illustrates the pressure over time of a pressure sensor and the slope over time of a slope sensor according to one embodiment of the present invention. FIG. 12 schematically illustrates the error direction vector according to the pressure of a plurality of pressure sensors according to one embodiment of the present invention. FIG. 13 schematically illustrates a ground subsidence area estimated through a plurality of error direction vectors calculated from a plurality of ground signal lights according to one embodiment of the present invention. FIG. 14 schematically illustrates the interlocking of a floor traffic light system and a CCTV according to one embodiment of the present invention. Specific details for implementing the invention

[0030] Hereinafter, various embodiments and / or aspects are disclosed with reference to the drawings. For illustrative purposes, numerous specific details are disclosed in the following description to aid in a general understanding of one or more aspects. However, it will also be recognized by those skilled in the art that these aspects may be practiced without such specific details. The following description and the accompanying drawings describe specific exemplary aspects of one or more aspects in detail. However, these aspects are exemplary, and some of the various methods in the principles of the various aspects may be used, and the description is intended to include all such aspects and their equivalents.

[0032] In addition, various aspects and features will be presented by a system that may include multiple devices, components and / or modules, etc. It should also be understood and recognized that various systems may include additional devices, components and / or modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in relation to the drawings.

[0033] Terms such as “embodiment,” “example,” “aspect,” “example,” etc. as used herein may not be interpreted as implying that any aspect or design described is superior or more advantageous than other aspects or designs. Terms used below, such as “part,” “component,” “module,” “system,” “interface,” etc., generally refer to computer-related entities and may, for example, refer to hardware, a combination of hardware and software, or software.

[0034] Additionally, the terms “comprising” and / or “comprising” should be understood to mean that the relevant feature and / or component is present, but not to exclude the presence or addition of one or more other features, components and / or groups thereof.

[0035] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0036] Furthermore, in the embodiments of the present invention, all terms used herein, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0038] FIG. 1 schematically illustrates an exploded view of a floor signal light (1000) according to one embodiment of the present invention.

[0039] FIG. 2 schematically illustrates a cross-sectional view of a floor signal light (1000) according to one embodiment of the present invention.

[0041] A floor signal light system (1) for detecting ground subsidence according to one embodiment of the present invention comprises: a protective case (1100) in the form of a container with an open top and an internal receiving space formed therein; an outer casing (1200) disposed inside the protective case (1100) with an open top and an internal receiving space formed therein; an inner casing (1300) disposed inside the outer casing (1200) and including an LED module (1310) that emits light according to an external signal; a cover part (1400) including a cover (1410) disposed on the upper side of the inner casing (1300); and a plurality of seesaw lever parts (1500) disposed on the lower side of the outer casing (1200) to raise the outer casing (1200) in a biased manner. A plurality of floor signal lights (1000) comprising a sensor unit (1600) including a tilt sensor (1610) disposed inside the inner casing (1300) and a plurality of pressure sensors (1620) disposed on the outer bottom surface of the protective case (1100); and a control unit (2000) installed outside the floor signal lights (1000) and capable of communicating with the sensor unit (1600) and the LED module (1310) via wired or wireless communication, wherein the control unit (2000) receives tilt information and a plurality of pressure information transmitted from the sensor unit (1600), and can detect subsidence of the ground in which the protective case (1100) is buried based on the received tilt information and a plurality of pressure information.

[0043] Referring to FIGS. 1 and 2, a floor signal light system (1) for detecting ground subsidence according to one embodiment of the present invention comprises a plurality of floor signal lights (1000) installed embedded in the ground, a control unit (2000) communicating with the floor signal lights (1000) via wired or wireless communication, and an external server (2) that receives data from the control unit (2000) and sends an alarm to an administrator terminal. At this time, the server (2) may not be included in the system itself and may use a separate external server.

[0044] According to one embodiment of the present invention, the ground signal light (1000) can function as an intelligent sensor node that detects and analyzes the ground conditions of the installed location in real time, going beyond a simple signal display device.

[0045] The mechanical structure of the above-described ground signal light (1000) is clearly divided into a static structure fixed to the ground and a dynamic structure capable of angle adjustment within it. The static structure, the protective case (1100), is in the form of a container with an open top and is buried in the ground to serve as a solid foundation frame for the entire system. The dynamic structure is composed of a combination of an outer casing (1200) placed inside the protective case (1100), an inner casing (1300) housed inside the outer casing (1200) and containing a light-emitting element such as an LED module (1310), and a cover part (1400) covering the top of the inner casing (1300). This dynamic structure is not directly fixed to the protective case (1100) but is supported only by a plurality of seesaw lever parts (1500) placed at the bottom, allowing it to rise, fall, and tilt independently of the protective case (1100).

[0046] A sensor unit (1600) according to one embodiment of the present invention includes two types of sensors to detect abnormal signs of the ground from various angles. First, a plurality of pressure sensors (1611, 1612, 1613) are spaced apart from each other on the outer bottom surface of a protective case (1100), which is a static structure.

[0047] This positioning is intended to allow the sensor to measure the vertical support pressure applied directly from the ground to the protective case (1100). Since this support pressure decreases when the ground weakens or a void occurs, this allows for the detection of the primary sign, or 'cause,' of ground subsidence. Second, the tilt sensor (1610) is placed inside the inner casing (1300), which is a dynamic structure. This sensor precisely measures the tilting of the floor signal light (1000) structure itself resulting from ground subsidence, that is, the secondary sign, or 'result.'

[0048] This structure is designed to measure changes in absolute pressure of the ground by placing a pressure sensor (1620) in a protective case (1100) fixed to the ground, and to measure whether twisting has occurred at the angle at the time of initial installation by measuring the change in inclination.

[0049] The physical location of each sensor is directly related to its functional purpose, and this dual sensor arrangement enables a single system to effectively solve two distinct tasks: cause analysis (pressure) and result correction (slope).

[0050] Consequently, the structure of the present invention has the effect of implementing a complete safety management system capable of early detection of ground subsidence and immediate physical response to detected abnormalities.

[0051] Meanwhile, the above ground subsidence may include a 'sinkhole'.

[0053] FIG. 3 schematically illustrates a cross-sectional view of a seesaw lever part (1500) according to one embodiment of the present invention.

[0054] FIG. 4 schematically illustrates a bottom perspective view of a seesaw lever part (1500) according to one embodiment of the present invention.

[0056] According to one embodiment of the present invention, the seesaw lever part (1500) comprises: a straight seesaw rod (1510) arranged in the longitudinal direction of the floor signal light (1000) on the protective case (1100); and an adjustment bolt (1520) having one end connected to one end of the seesaw rod (1510) and the other end extending to the lower side of the cover (1410). and a lifting rod (1530) having one end connected to the other end of the seesaw rod (1510) and the other end positioned on the lower side of the outer casing (1200); wherein the seesaw rod (1510) is rotatably coupled to a part of the protective case (1100), and the adjustment bolt (1520) rises or falls according to the direction of rotation, and when the adjustment bolt (1520) falls and force is applied to one end of the seesaw rod (1510), the seesaw rod (1510) rotates and the other end of the seesaw rod (1510) raises the lifting rod (1530), thereby causing the lifting rod (1530) to raise the outer casing (1200) in a biased manner and adjust the angle of the outer casing (1200), thereby enabling it to respond to the twisting of the floor signal light (1000) caused by ground subsidence.

[0057] According to one embodiment of the present invention, the seesaw rod (1510) further includes a lowering stopper (1540) formed to protrude in the opposite direction of the lifting rod (1530); and the lowering stopper (1540) can prevent the lifting rod (1530) from descending beyond a preset distance when the lifting rod is lowered by the adjustment bolt (1520).

[0059] Referring to FIGS. 3 and 4, the seesaw lever section (1500) is a key mechanical device for correcting the tilt of the floor signal light (1000) caused by ground subsidence. It is designed to apply the classical lever principle so that a worker can precisely adjust the height of a heavy dynamic structure (outer casing (1200), inner casing (1300), cover section (1400)) with a small amount of force. Multiple seesaw lever sections (1500) are installed along the length direction of the floor signal light (1000) on the bottom surface of the protective case (1100), allowing the height of each point to be controlled independently.

[0060] The key components of the seesaw lever section (1500) are a straight seesaw rod (1510), an adjustment bolt (1520) that applies vertical force by being rotated by an operator, and a lifting rod (1530) that converts the rotational force of the seesaw rod (1510) into a vertical upward force to push up the outer casing (1200). When the operator rotates the adjustment bolt (1520), the bolt descends along the threads and presses against one end of the seesaw rod (1510). This rotates the seesaw rod (1510) around the hinge axis (1561) and raises the lifting rod (1530) connected to the opposite end to adjust the height of the outer casing (1200) at the corresponding point.

[0061] In particular, the seesaw lever portion (1500) of the present invention has a stable support structure including a partition wall (1550) and an axle bracket (1560). The partition wall (1550) is fixed vertically inside the protective case (1100) and acts as an alignment jig that guides the adjustment bolt (1520) and the lifting rod (1530) to move only vertically without shaking. This is because the adjustment bolt (1520) and the lifting rod (1530) are aligned while passing through the first through hole (1551) and the second through hole (1552) of the partition wall (1550), respectively.

[0062] Meanwhile, the shaft bracket (1560) is firmly fixed to this bulkhead (1550) and stably supports the hinge axis (1561), which is the center of rotation of the seesaw rod (1510). This structure is an essential prerequisite for enabling precise mechanical correction corresponding to quantitative tilt data (e.g., '2.5 degrees tilted') received from the server (2). If the rotation axis of the lever is unstable or the parts are shaking, precise angle adjustment is impossible and the value of the detection system is halved.

[0063] Additionally, the seesaw rod (1510) is equipped with a lowering stopper (1540) protruding from the opposite side of the lifting rod (1530), which acts as a safety device to prevent the lifting rod (1530) from descending below a set limit by excessively loosening the adjustment bolt (1520). This prevents damage to the system caused by operator error, thereby increasing the safety of on-site operations.

[0064] Consequently, the seesaw lever section (1500), which includes a precision support structure centered on the bulkhead (1550) and a safety device called a lowering stopper (1540), provides high reliability that can perform physical correction quickly and accurately in response to a warning from the intelligent detection system, and this can have an important effect in ensuring the effectiveness of the entire system.

[0066] FIG. 5 schematically illustrates a plan view and a cross-sectional view of a cover portion (1400) according to one embodiment of the present invention.

[0068] According to one embodiment of the present invention, the cover (1410) includes a plurality of adjustment holes (1411) which are through holes formed at positions corresponding to the adjustment bolt (1520); and the cover portion (1400) further includes a plurality of adjustment doors (1420) that open and close the plurality of adjustment holes (1411); and when adjusting the adjustment bolt (1520), the adjustment bolt (1520) can be adjusted by opening only the adjustment doors (1420) without removing the cover (1410).

[0069] According to one embodiment of the present invention, the cover (1410) includes a plurality of adjustment holes (1411) which are through holes formed at positions corresponding to the adjustment bolt (1520); and the cover portion (1400) further includes a plurality of adjustment doors (1420) that open and close the plurality of adjustment holes (1411); and when adjusting the adjustment bolt (1520), the adjustment bolt (1520) can be adjusted by opening only the adjustment doors (1420) without removing the cover (1410).

[0070] According to one embodiment of the present invention, the cover portion (1400) further comprises an elastic sealing member (1430) made of an elastic material connecting the end of the cover (1410) and the open upper end of the protective case (1100); and the outer casing (1200) is positioned so that a portion of its upper part is exposed to the outside of the protective case (1100) when it is placed inside the protective case (1100), so that the outer casing (1200) can be raised, lowered, and tilted inside the protective case (1100) while the cover portion (1400) is coupled to the upper side of the outer casing (1200); and when the outer casing (1200) is raised, lowered, and tilted inside the protective case (1100) by the adjustment of the seesaw lever portion (1500), the elastic sealing member (1430), which is made of an elastic material, seals the space between the cover portion (1400) and the protective case (1100) to prevent rainwater It is possible to prevent external moisture from penetrating into the protective case (1100).

[0072] The cover portion (1400) of the present invention is located at the top of the ground signal light (1000) and serves to protect internal components and withstand the load of pedestrians. It consists of a cover frame (1412) made of a high-strength material and a transparent window (1413) made of a reinforced material that transmits LED light.

[0073] According to another embodiment of the present invention, the cover frame (1412) and the transparent window (1413) may be made of the same material.

[0074] The cover portion (1400) of the present invention is characterized by being designed to maximize the convenience and efficiency of maintenance work. A plurality of adjustment holes (1411) are formed through the upper surface of the cover (1410) at a position that precisely aligns vertically with the adjustment bolt (1520) of each seesaw lever portion (1500) located at the bottom. Normally, these adjustment holes (1411) are sealed by an adjustment door (1420) equipped with waterproof and dustproof functions.

[0075] If tilt correction is required due to ground subsidence, the maintenance worker does not need to remove the entire cover (1410), which is difficult to handle. Instead, only the adjustment door (1420) at the point requiring correction can be opened with a simple tool, and the adjustment bolt (1520) can be rotated directly by inserting an adjustment tool, such as a T-wrench, through the exposed adjustment hole (1411). Once the work is completed, the adjustment door (1420) can be closed again to seal it, thereby quickly finishing the work.

[0076] The above adjustment door (1420) method allows a single worker to complete the work within minutes using only basic tools. This means that when a system manager receives a real-time warning from the server (2), they can respond immediately and at low cost, making it possible to practically implement the concept of preventive maintenance of the system. Consequently, the design of the cover part (1400) including the adjustment hole (1411) and the adjustment door (1420) makes the angle correction of the floor signal light (1000) non-invasive and rapid, thereby significantly improving the efficiency and economy of maintenance.

[0077] Meanwhile, the elastic sealing member (1430) according to one embodiment of the present invention is made of an elastic material such as EPDM rubber, which has excellent weather resistance and durability. This connects the gap between the lower edge of the cover (1410) and the upper edge of the protective case (1100), thereby fundamentally blocking external contaminants such as rainwater, dust, and de-icing calcium chloride from penetrating into the protective case (1100) even while the outer casing (1200) is raised, lowered, and tilted.

[0078] The above elastic sealing member (1430) is composed of a first coupling lip (1431) that is fitted into a first coupling groove (1414) formed in the lower part of the cover (1410), a second coupling lip (1432) that is fitted into a second coupling groove (1110) formed in the upper part of the protective case (1100), and an elastic membrane (1433) that connects the first coupling lip and the second coupling lip and provides elasticity. Unlike fixing methods using adhesive or bolts, this uses a mechanical snap-fit ​​method, making assembly and replacement easy.

[0080] FIG. 6 schematically illustrates a floor signal light (1000) in a normal state without ground subsidence according to one embodiment of the present invention.

[0081] FIG. 7 schematically illustrates a ground signal light (1000) in which ground subsidence has occurred according to one embodiment of the present invention.

[0082] FIG. 8 schematically illustrates a floor signal light (1000) adjusted in response to ground subsidence through a seesaw lever part (1500) after ground subsidence according to one embodiment of the present invention.

[0083] FIGS. 6 to 8 visually illustrate the process from the occurrence of ground subsidence to the mechanical response, and clearly explain the necessity and operating principle of the intelligent sensing system of the present invention.

[0085] FIG. 6 illustrates a stable normal state of the ground (a). The top surface of the cover portion (1400) of the ground signal light (1000) is level with the surrounding pavement surface without any step difference. In this state, both the pressure sensor (1620) and the tilt sensor (1610) output values ​​within the normal range.

[0086] FIG. 7 illustrates a problem situation in which a portion (b) of the ground has subsided. As the protective case (1100) fixed to the ground tilts along with the subsided ground, the entire internal dynamic structure tilts together. This causes a dangerous step difference between the cover portion (1400) and the paved sidewalk surface, and the direction of LED light illumination is distorted. At this point, the control unit (2000) of the present invention detects a change in tilt exceeding a threshold value from the tilt information received from the tilt sensor (1610), detects a pressure drop due to loss of support capacity from the pressure sensor (1620), and transmits a warning alarm to the server (2). A more detailed explanation regarding this will be provided later.

[0087] FIG. 8 illustrates the state in which maintenance personnel dispatched after receiving a warning alarm from the control unit (2000) or server (2) have completed mechanical correction. With the tilted protective case (1100) left as is, the adjustment bolt (1520) of the seesaw lever unit (1500) was operated to correct only the angle of the dynamic structure (outer casing (1200), inner casing (1300), cover unit (1400)). As a result, the cover unit (1400) was again level with the surrounding pavement surface, restoring pedestrian safety and normal signal functions.

[0088] In this way, the floor signal light (1000) according to one embodiment of the present invention allows the floor signal light (1000) to be maintained in a stable embedded state by simply adjusting it to the changed ground environment without exposing and reconstructing the floor signal light (1000) when soil shifting or ground subsidence occurs due to excessive rain, etc., by operating the seesaw lever part (1500).

[0089] However, if the ground subsidence (b), which is the root cause, continues to progress, it may eventually exceed the adjustment range of the seesaw lever part (1500) or lead to a larger collapse. Therefore, it is essential to continuously track the progress of the ground subsidence through the pressure sensor (1620) and determine when fundamental civil engineering work is required.

[0090] Consequently, the present invention provides the effect of ensuring short-term safety by immediately correcting the twisting of the structure caused by ground subsidence through the seesaw lever part (1500), while simultaneously providing comprehensive safety management capabilities that support the establishment of long-term safety measures by continuously monitoring the root cause through the sensor system.

[0092] FIG. 9 schematically illustrates a block diagram of a floor signal light system (1) according to one embodiment of the present invention.

[0093] According to one embodiment of the present invention, the control unit (2000) receives the tilt information and the plurality of pressure information from the sensor unit (1600) according to a preset time interval for each of the plurality of floor signal lights (1000), calculates pressure difference information which is the difference between the preset initial pressure information and the plurality of pressure information according to each of the plurality of pressure sensors (1620), determines whether each of the pressure difference information exceeds a preset normal pressure range, and if the number of pressure information exceeding the normal pressure range among the plurality of pressure information is greater than or equal to a preset threshold number, checks the tilt information at that time, and if the tilt information is different from the preset initial tilt information, determines that subsidence has occurred in the ground where the floor signal light (1000) to which the plurality of pressure information was transmitted is buried.

[0095] Referring to FIG. 9, a floor signal light system (1) according to one embodiment of the present invention may have a distributed control structure including a plurality of floor signal lights (1000) and a control unit (2000) that controls them.

[0096] In this structure, the control unit (2000) performs primary data processing and risk assessment at the site to improve the responsiveness and reliability of the system. The data processing flow is as follows.

[0097] First, the sensor unit (1600) of each floor signal light (1000) measures inclination information and pressure information and transmits them to the control unit (2000). The information recording unit (2310) belonging to the risk judgment unit (2300) within the control unit (2000) continuously records and stores the received pressure information over time. The error judgment unit (2320) monitors this recorded pressure data in real time and determines whether each pressure value deviates from a preset normal pressure range.

[0098] More specifically, this is a method of calculating pressure difference information, which is the difference between initial pressure information and current pressure information that is preset by a control unit (2000) or an administrator, and determining whether the pressure difference information deviates from a preset normal pressure range.

[0099] As a specific example, when the floor traffic light (1000) is properly installed, the pressure is 10 kg / m 2 If it was, this is set as the initial pressure information. After time passes, the received pressure information is 9.7 kg / m 2 In this case, the pressure difference information becomes 0.3. For example, the normal pressure range is 0 to 0.5 kg / m² 2 In this case, it is judged to be within the normal range.

[0100] After some time, the received pressure information is 9.0 kg / m 2 In this case, the pressure difference information becomes 1.0. For example, the normal pressure range is 0 to 0.5 kg / m² 2 In this case, it may be determined that an abnormality has occurred.

[0101] Meanwhile, in the case where the pressure increases, the pressure difference information becomes negative (-) and deviates from the normal pressure range; however, since it is natural for actions such as a pedestrian stepping on the floor traffic light (1000) to increase the pressure due to the characteristics of the floor traffic light (1000), the case where the pressure difference information is negative can be determined as normal. Alternatively, the normal pressure range itself is '0.5 kg / m 2 It can be set to a range that includes negative numbers, such as 'less than'.

[0102] That is, the control unit (2000) according to one embodiment of the present invention can determine that it is normal when the value of the pressure sensor (1620) increases. This reduces the computational resources of the control unit (2000), thereby enabling more efficient control.

[0104] If a significant pressure drop outside the normal range is detected by one or more pressure sensors (1620), this acts as a primary trigger signal for the possibility of ground abnormality. When this trigger signal occurs, the subsidence judgment unit (2330) is activated.

[0105] The above subsidence judgment unit (2330) immediately retrieves the slope information at the corresponding point in time from the slope judgment unit (2200) and performs a second verification.

[0106] At this time, the slope determination unit (2200) stores the initial slope information measured when the ground traffic light (1000) is installed in an internal memory. This is because the crosswalk or sidewalk block where the ground traffic light (1000) is installed may have a specific slope rather than a perfectly horizontal surface for drainage purposes. The slope determination unit (2200) compares the currently measured slope information with the stored initial slope information to calculate the difference value, that is, the actual change in slope.

[0107] For example, if a crosswalk is installed on a slope of 1.5 degrees for drainage, the 1.5 degrees measured at the time of installation is stored as 'initial slope information'. Subsequently, when the sensor measures 2.5 degrees, the slope determination unit (2200) calculates a change amount of 1.0 degrees, rather than an absolute value of 2.5 degrees, and determines whether this change amount exceeds a preset normal slope range (e.g., -0.5 to +0.5 degrees).

[0108] That is, a control unit (2000) according to one embodiment of the present invention can store initial tilt information measured from a tilt sensor (1610) when the floor signal light (1000) is first installed, and perform an initialization process of setting this value to 0 degrees (zero point) which is the reference of the system.

[0109] Subsequently, the tilt judgment unit (2200) determines that a significant tilt has occurred only when the tilt information received in real time deviates from the preset error range from the set zero point. This enables the detection of accurate relative tilt changes even when perfect horizontal installation is difficult depending on the installation environment, thereby increasing the precision and reliability of the system.

[0110] According to another embodiment of the present invention, initial tilt information can be manually entered by an administrator.

[0112] The above subsidence judgment unit (2330) finally determines that 'ground subsidence has occurred' and transmits a warning signal to an external server (2) only when both the pressure drop (first condition) and the significant change in slope (second condition) are satisfied.

[0113] This distributed control structure and two-stage verification logic effectively filter out unnecessary alarms caused by temporary pressure changes, such as when a pedestrian steps on it or a vehicle passes by. This minimizes system malfunctions and maximizes the efficiency and reliability of the entire system by transmitting only verified risk information to the upper system.

[0114] Meanwhile, the slope judgment unit (2200) can send an alarm about an abnormal slope to the outside when the change in slope exceeds the normal slope range, in a state where there is no change in pressure, or regardless of the change in pressure.

[0116] An LED module (1310) according to one embodiment of the present invention can be turned on / off, color controlled, and brightness controlled by a signal control unit (2100) of a control unit (2000). The signal control unit (2100) can receive a necessary traffic control signal by communicating with an external traffic signal controller via wired or wireless means, and can control the LED module (1310) by transmitting a signal corresponding to the LED module (1310) based thereon.

[0118] Meanwhile, the present invention includes an intelligent monitoring system that remotely diagnoses and manages the condition in addition to a mechanical angle adjustment function.

[0119] According to another embodiment of the present invention, the entire floor signal light system (1) may further include a floor signal light (1000) installed at the site, a control unit (2000), a CCTV (3) placed nearby, and a server (2) of a remote control center.

[0120] When the tilt judgment unit (2200) of the above control unit (2000) determines that an abnormality has occurred in the tilt, this information (including tilt information and identification information of the floor signal light where the tilt abnormality occurred) is transmitted to the server (2) through the alarm unit (2400).

[0121] At this time, the server (2) receives CCTV footage of the area where the floor signal light is located from the video receiving unit (2.1).

[0122] A server (2) according to one embodiment of the present invention transmits an image received from a video receiving unit (2.1) to a video judgment unit (2.2), and the video judgment unit (2.2) analyzes the judgment result calculated by the inclination judgment unit (2200) and the CCTV image received from the video receiving unit (2.1) to determine whether a problem has actually occurred in the floor traffic light, and if a problem has actually occurred, it can perform an abnormality notification by transmitting the details to an administrator through a notification transmission unit (2.3).

[0123] Through this, the manager who receives the notification can cross-verify the sensor value and the actual captured video without visiting the site, immediately identify which location the floor signal light (1000) has a problem with, and quickly dispatch maintenance personnel to take action.

[0124] Furthermore, the system (1) of the present invention can detect the ‘reverse light’ state of the floor signal light (1000) through the CCTV (3).

[0125] To this end, the signal control unit (2100) of the control unit (2000) simultaneously transmits a 'control signal' (intended signal information) to the LED module (1310) of the floor signal light (1000) based on a signal received from an external traffic signal controller to the server (2).

[0126] The server (2) periodically receives a video of the current light-emitting state of the floor traffic light (1000) captured from the CCTV (3) through the video receiving unit (2.1). The video judgment unit (2.2) analyzes the received video information to determine the 'actual light-emitting state' of the floor traffic light (1000).

[0127] Subsequently, the image judgment unit (2.2) compares the 'control signal' (e.g., 'green light') received from the signal control unit (2100) with the 'actual light-emitting state' (e.g., 'red light' or 'off') confirmed through image analysis. If the two signals are inconsistent, it determines this as a 'reverse light' state and immediately sends a reverse light occurrence warning notification to the administrator via the notification transmission unit (2.3).

[0129] FIG. 10 schematically illustrates a block diagram of a floor signal light system (1) according to another embodiment of the present invention.

[0131] FIG. 10 illustrates a centralized control structure in which the subject of data analysis and risk determination is located on an external server (2) as another embodiment of the present invention.

[0132] In this embodiment, the control unit (2000) installed at the site focuses on the role of the information output unit, and its function is simplified.

[0133] That is, the control unit (2000) functions as a data collection and transmission device that transmits raw tilt information and pressure information received from the sensor unit (1600) to an external server (2) in real time via a communication network after minimal processing. According to another embodiment of the present invention, all core analysis logic is implemented in the external server (2). The server (2) collects and manages a vast amount of sensor data from a number of floor traffic light systems (1) installed throughout the city. The risk judgment unit (2300) within the server (2) includes and expands all functions that were performed by the control unit (2000) of FIG. 9.

[0134] That is, the information recording unit (2310) stores time-series data of each floor signal light (1000) in a database, and the error judgment unit (2320) monitors whether there is an abnormality in the stored pressure data. If a pressure abnormality is detected, the subsidence judgment unit (2330) analyzes the inclination data of the corresponding floor signal light (1000) together to make a final determination of whether ground subsidence has occurred.

[0135] In particular, in this structure according to another embodiment of the present invention, the slope judgment unit (2200), which was a separate module in FIG. 9, is integrated into the risk judgment unit (2300).

[0136] This is because the central server (2) performs a much more complex and high-dimensional analysis, such as comprehensively analyzing the correlation between pressure and slope data of several adjacent floor traffic lights (1000), as well as the simple slope change of individual floor traffic lights (1000).

[0137] Therefore, from the perspective of the server (2), the slope judgment is treated as part of the overall risk assessment model rather than an independent function, so it is expressed in an integrated form.

[0138] This centralized structure has the effect of maximizing the scalability and intelligence of the entire system. When introducing a new analysis algorithm or a machine learning-based prediction model to the server (2), only the server (2) software needs to be upgraded without the need to individually update numerous control units (2000) at the site. In addition, it provides a foundation for performing more sophisticated predictions by integrating external data such as rainfall and nearby construction information.

[0139] That is, according to another embodiment of the present invention, the server (2) can perform the role that the control unit (2000) performs in one embodiment.

[0140] According to one embodiment of the present invention, the server (2) can communicate with a plurality of control units (2000) via wired or wireless means.

[0141] Meanwhile, although the CCTV (3) is not shown in FIG. 10, this is because the configuration in which the server (2) links with the CCTV (3) to send CCTV images to the outside is the same in both the embodiment of FIG. 9 and the other embodiment of FIG. 10, and the server (2) does not not link with the CCTV (3) in the other embodiment of FIG. 10.

[0143] FIG. 11 schematically illustrates the pressure over time of a pressure sensor (1620) and the slope over time of a slope sensor (1610) according to one embodiment of the present invention.

[0144] FIG. 11 shows the core logic of the ground subsidence judgment unit (2330) in determining ground subsidence through a time-series data graph. This graph simultaneously shows changes in pressure and slope over time, explaining how the system distinguishes between temporary noise and actual abnormal signals.

[0145] The top of the graph shows the pressure change measured by the three pressure sensors (1621, 1622, 1623), and the bottom shows the angle change measured by the tilt sensor (1610). In section 'a', a rapid 'increase' in pressure is observed. This corresponds to a normal external load, such as a pedestrian stepping over the floor traffic light (1000), and the system determines this as a normal situation and ignores it because the pressure did not 'decrease' and there was no change in tilt.

[0146] The point at which ground subsidence actually begins is T0. From this point, the measured values ​​of pressure sensors (1620) P2 and P3 begin to gradually decrease, which is a clear warning sign that the ground bearing capacity beneath the sensors is weakening. The critical point at which the system issues a warning is T1. At this point, the value of pressure sensor (1620) P3 falls below a preset risk threshold (P3'). The error judgment unit (2320) detects this event and sends a signal to the subsidence judgment unit (2330). The subsidence judgment unit (2330) immediately checks the slope data at the corresponding point in time (T1) and confirms that the slope value has changed to a significant value other than zero.

[0147] When both conditions of "continuous pressure drop" and "simultaneous occurrence of tilt" are met, the system confirms this as an actual ground subsidence situation and sends a warning to the manager. If only pressure sensors were used, unnecessary warnings could be triggered by temporary sensor errors or minor ground compaction phenomena. Conversely, if only tilt sensors were used, detection would only be possible after significant subsidence has already occurred, diminishing the significance of early warning. By combining a "leading indicator"—pressure drop—with a "confirming indicator"—the occurrence of tilt—this invention ensures both the speed of early warning and the reliability of the final judgment. Consequently, through an algorithm that analyzes the time-series correlation of pressure and tilt data, this system precisely distinguishes between routine external environmental changes and actual ground hazards, providing managers with highly reliable warnings and demonstrating an excellent effect in preventing the waste of maintenance resources.

[0149] FIG. 12 schematically illustrates the error direction vector according to the pressure of a plurality of pressure sensors (1620) according to one embodiment of the present invention.

[0151] According to one embodiment of the present invention, the sensor unit (1600) comprises: a tilt sensor (1610) disposed inside the inner box (1300) for measuring tilt information, which is the degree to which the bottom surface of the inner box (1300) is tilted with respect to the direction of gravity; a first pressure sensor (1621) disposed on the outer bottom surface of the protective case (1100); and a second pressure sensor (1622) disposed on the outer bottom surface of the protective case (1100) at a position different from that of the first pressure sensor (1621). and a third pressure sensor (1623) positioned at a different location from the first pressure sensor (1621) and the second pressure sensor (1622) on the outer bottom surface of the protective case (1100); wherein the first pressure sensor (1621), the second pressure sensor (1622), and the third pressure sensor (1623) can measure the pressure applied to the bottom surface of the protective case (1100) by the ground in which the protective case (1100) is buried.

[0152] According to one embodiment of the present invention, the server (2) can calculate a plurality of error information in which each of the plurality of pressure information exceeds a normal pressure range, calculate an error direction vector in which the error information is small and the error information is large based on the plurality of error information, and calculate the point where ground subsidence occurred and the scale of ground subsidence based on the plurality of error direction vectors calculated from each of the plurality of ground signal lights (1000).

[0154] FIG. 12 illustrates the theoretical principle of how the present invention converts simple pressure measurements into vector information indicating the direction of ground subsidence.

[0155] At least three pressure sensors (1620) (first pressure sensor (1621), second pressure sensor (1622), and third pressure sensor (1623)) are arranged in a triangular shape on the outer bottom surface of the protective case (1100). These sensors each measure the pressure exerted by the ground supporting the protective case (1100).

[0156] In another embodiment of the present invention, three pressure sensors (1620) may be arranged in a straight line.

[0157] 1, 3, and 5 shown in FIG. 12 according to one embodiment of the present invention represent the relative strengths of the first pressure sensor (1621) pressure P1, the second pressure sensor (1622) pressure P2, and the third pressure sensor (1623) pressure P3, respectively.

[0158] Under normal conditions, the pressure values ​​of the three sensors remain at similar levels; however, if localized ground subsidence, such as a sinkhole or ground cavity, occurs nearby, the sensor closer to the subsidence point experiences a greater pressure drop. For example, if ground subsidence (A) in the drawing occurs closest to the third pressure sensor (1623), the value of P3 becomes significantly lower than the values ​​of P1 or P2. (Here, Pn is the pressure value of the nth pressure sensor.) This is because the closer the ground subsidence is, the more the soil constituting the ground moves toward the side where the ground subsidence occurred, and the lower the density becomes.

[0159] This spatial imbalance of pressure forms a pressure gradient. The system of the present invention calculates an 'error direction vector' using this pressure gradient. Mathematically, this vector represents the direction from the point of highest pressure to the point of lowest pressure. In other words, a pressure distribution plane is virtually generated using the position coordinates of each sensor and the measured pressure values, and the error direction vector is obtained by projecting the steepest downward direction of that plane onto the surface.

[0160] Since the pressure drop at P3 is the greatest compared to P1 and P2, the calculated error direction vector points from the region where P1 and P2 are located toward the region where P3 is located. The direction of this vector indicates the estimated direction of ground subsidence, while the magnitude of the vector indicates the severity of the pressure deviation.

[0161] This feature achieves a dramatic improvement in the qualitative value of information, rather than merely a quantitative increase in data, by combining multiple scalar values ​​(pressure from each sensor) to generate a single meaningful vector value (direction of danger). While a "danger" warning merely informs the manager that "something is wrong," information such as "danger, bearing capacity weakening in the northeast direction" indicates "where to investigate first," thereby maximizing the efficiency of follow-up actions (e.g., Ground Penetrating Radar (GPR) surveys).

[0162] Consequently, the function of arranging multiple pressure sensors (1620) and analyzing the difference in their measurements to calculate an error direction vector elevates the system from a simple alarm device to a precision diagnostic tool, which enables rapid and goal-oriented field investigation and has the effect of greatly improving the efficiency of accident prevention and recovery operations.

[0164] FIG. 13 schematically illustrates a ground subsidence area estimated through a plurality of error direction vectors calculated from a plurality of floor signal lights (1000) according to one embodiment of the present invention.

[0165] FIG. 13 shows an area (A) where an actual sinkhole has occurred and a number of ground signal lights (1000) distributed around it. Groups (B) of ground signal lights (1000) adjacent to the sinkhole each detect ground weakening and generate their own error direction vectors (arrows). These vectors all tend to point toward the center area (A) of the sinkhole. Additionally, the closer the ground signal light (1000) is to the sinkhole, the greater the pressure drop it experiences, so the magnitude of the calculated error direction vector (length of the arrow) appears longer. On the other hand, groups (C) of ground signal lights (1000) outside the influence zone of the sinkhole do not generate error direction vectors or generate only vectors of very small magnitude because the ground is stable.

[0166] According to one embodiment of the present invention, the control unit (2000) can synthesize the error direction vector of the ground signal light (1000) connected to the control unit (2000) and estimate the approximate size and location of the ground subsidence area (A) through calculations such as machine learning and algorithms.

[0167] According to one embodiment of the present invention, the server (2) can collect and synthesize all error direction vectors from the control unit (2000) of the floor signal light system (1) installed throughout a certain area, that is, from a plurality of control units (2000), and roughly calculate the ground subsidence area throughout the area.

[0168] This network-based approach connects individual sensor nodes (floor signal lights (1000)) to form one large 'underground condition detection network'.

[0169] This provides the ability to identify and visualize invisible underground risks from a macroscopic perspective, based on the same principle as a seismometer network identifying the epicenter and magnitude of an earthquake. The server (2) can overlay this data onto a GIS (Geographic Information System) map to provide the manager with very specific and actionable information, such as "a suspected ground weakening zone with a radius of 5 meters has occurred below the X intersection and near water pipe line D."

[0170] Consequently, the method of comprehensively analyzing error direction vectors calculated from multiple ground traffic lights (1000) enables the accurate location and scale of invisible ground subsidence to be estimated with high reliability, thereby producing an innovative effect that enables data-based proactive and scientific urban safety management.

[0171] Meanwhile, according to one embodiment of the present invention, the control unit (2000) is preferably placed inside a control panel (not shown) placed outside the floor signal light (1000), and the control panel may be a control panel in which a traffic signal controller used in a traffic signal system is installed.

[0173] FIG. 14 schematically illustrates the interlocking of a floor traffic light system and a CCTV according to one embodiment of the present invention.

[0175] According to one embodiment of the present invention, the control unit (2000) transmits ground subsidence occurrence information to the server (2) when it determines that ground subsidence has occurred. When the server (2) receives the ground subsidence occurrence information, it receives a video of the ground subsidence occurrence floor signal light (1000) through a CCTV (3) that photographs the location where the ground subsidence occurrence floor signal light (1000) is located, transmits a notification that ground subsidence has occurred to the administrator's administrator terminal, and transmits the video of the ground subsidence occurrence floor signal light (1000) along with the notification.

[0176] According to one embodiment of the present invention, the control unit (2000) further includes a signal control unit (2100) that receives a traffic signal from an external traffic signal controller, transmits a control signal calculated based on the traffic signal to an LED module (1310) of the floor signal light (1000), and transmits the control signal to the server (2); the server (2) further includes an image judgment unit (2.2) that analyzes image information received from a CCTV linked to the floor signal light system to determine the actual light emission state of the floor signal light (1000); and when a discrepancy occurs when comparing the control signal and the actual light emission state, the floor signal light (1000) is determined to be in a reverse state where it cannot display the correct signal, and transmits a reverse state notification to the administrator terminal of the administrator.

[0178] A number of ground traffic lights (1000) are installed in the crosswalk area, and are connected to a control unit (2000) inside a traffic signal control box to light up according to the signal. In addition, a CCTV (3) is installed at a location capable of capturing the crosswalk and the ground traffic lights (1000) and communicates with a server (2).

[0179] The system of the present invention can detect and verify various abnormal states through the image judgment unit (2.2). For example, 'G' indicates a state where it is normally lit up in 'green' in accordance with the pedestrian signal.

[0180] On the other hand, 'R' in FIG. 14 signifies a 'reverse light' state where the 'red' signal is incorrectly turned on even though the 'green' signal should be lit. Also, A signifies a 'off' state where the light does not turn on at all due to a light source failure or the like, even though a signal has been applied.

[0181] According to one embodiment of the present invention, the server (2) receives a ‘control signal’ of ‘green light’ from the signal control unit (2100) of the control unit (2000), receives video of an external CCTV through the video receiving unit (2.1), checks the ‘actual light-emitting state’ such as ‘R’ or ‘A’ of the CCTV video in the video judgment unit (2.2), and by comparing this with the control signal, can immediately detect such reverse light and fault conditions and notify the manager.

[0182] Meanwhile, according to one embodiment of the present invention, B of FIG. 14 indicates a state in which a step difference occurs between the ground signal light (1000) and the surrounding ground surface due to ground subsidence. This physical displacement is primarily detected by a tilt sensor (1600) inside the ground signal light.

[0183] The above server (2) receives an abnormal signal from the tilt sensor (1600) and simultaneously captures the site situation as shown in 'B' through the image receiving unit (2.1), and transmits it to the manager along with the tilt information, thereby enabling the manager to visually verify immediately whether it is a sensor error or actual ground subsidence and to respond accordingly.

[0185] According to one embodiment of the present invention, the condition of the ground is monitored in real time through a plurality of pressure sensors and tilt sensors equipped in a ground signal light, and the collected information is comprehensively analyzed on a server to detect the occurrence of ground subsidence at an early stage, thereby achieving the effect of preventing safety accidents.

[0186] According to one embodiment of the present invention, ground subsidence is determined by considering both changes in ground pressure and changes in the inclination of the ground signal light, thereby preventing malfunctions caused by temporary pressure changes such as vehicle traffic or the weight of pedestrians, and enabling the detection of ground abnormalities more accurately and reliably.

[0187] According to one embodiment of the present invention, an error direction vector is calculated based on the error values ​​of pressure information measured by a plurality of pressure sensors, and vector information calculated from a plurality of ground signal lights is combined to achieve the effect of estimating the exact location and scale of ground subsidence.

[0188] According to one embodiment of the present invention, even if the ground signal light tilts due to ground subsidence, the angle of the enclosure can be easily adjusted using a seesaw lever, thereby correcting the twist and maintaining normal function without the hassle of reinstalling the entire ground signal light.

[0189] According to one embodiment of the present invention, an adjustment door for adjusting the adjustment bolt is separately provided in the cover portion, so that when adjusting the angle, only the relevant part can be opened without the need to detach the entire upper cover, thereby enabling quick and convenient maintenance work.

[0190] According to one embodiment of the present invention, by integrating a ground safety monitoring function into the original function of a ground signal light, which is pedestrian signal guidance, it is possible to efficiently enhance urban safety infrastructure without the additional costs and spatial constraints required to build a separate ground detection system.

[0191] According to one embodiment of the present invention, when a server detects ground subsidence or an abnormal tilt, it immediately transmits a notification to an administrator's terminal, thereby enabling rapid recognition of dangerous situations and initial response measures, which can effectively prevent potential major accidents.

[0192] According to one embodiment of the present invention, by deflecting and raising the angle of the enclosure through a seesaw lever part composed of a seesaw rod, an adjustment bolt, and a lifting rod, and actively responding to the angle twisting of the floor signal light, it is possible to achieve an effect that contributes to maintaining the LED radiation direction and ensuring visibility.

[0193] According to one embodiment of the present invention, by mechanically stabilizing the rotation center of a seesaw rod through a rotational support structure composed of a bulkhead, an axle bracket, and a hinge shaft, the effect of improving precision and durability during repeated adjustments can be achieved.

[0194] According to one embodiment of the present invention, by providing a lowering stopper that limits excessive lowering of the lifting rod, it is possible to prevent excessive deformation and component damage during the adjustment process and extend the lifespan of the device.

[0195] According to one embodiment of the present invention, the angle can be quickly adjusted on-site by accessing the adjustment bolt through the adjustment hole and adjustment door of the cover without removing the cover, thereby reducing maintenance time and costs.

[0196] According to one embodiment of the present invention, the control unit transmits the calculated tilt information to a server, and when the server exceeds the normal tilt information range, it provides a notification to an administrator terminal, thereby enabling remote monitoring and rapid response to abnormal conditions.

[0198] Although the embodiments have been described above with reference to limited examples and drawings, those skilled in the art can make various modifications and variations from the description above. For example, suitable results may be achieved even if the described techniques are performed in a different order than described, and / or if the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents. Therefore, other implementations, other embodiments, and equivalents to the claims below are also within the scope of the claims. Explanation of the symbols

[0200] 1: Ground traffic light system 1000: Ground traffic light 1100: Protective case 1110: Second coupling groove 1200: Outer casing 1300: Inner casing 1310: LED module 1311: LED light emitter 1320: LED cover 1400: Cover part 1410: Cover 1411: Adjustment hole 1412: Cover frame 1413: Transparent window 1414: First coupling groove 1420: Adjustment door 1430: Elastic sealing member 1431: First connecting lip 1432: Second bonding lip 1433: Elastic membrane 1500: Seesaw lever section 1510: Seesaw rod 1520: Adjustment bolt 1530: Lifting rod 1531: Rubber damper 1540: Lowering stopper 1550: Bulkhead 1551: First penetration hole 1552: Second through hole 1560: Shaft bracket 1561: Hinge axis 1600: Sensor part 1610: Tilt sensor 160: Pressure sensor 1621: 1st pressure sensor 1622: 2nd pressure sensor 1623: Third pressure sensor 2000: Control unit 2100: Signal control unit 2200: Slope determination unit 2300: Risk Assessment Section 2310: Information Record Section 2320: Error Judgment Unit 2330: Subsidence Judgment Unit 2400: Alarm Section 2: Server 2.1: Image Receiving Unit 2.2: Image Judgment Unit 2.3: Alarm Transmitter

Claims

Claim 1 A floor signal light system for detecting ground subsidence, comprising: a protective case in the form of a container with an open top and an internal receiving space; an outer casing disposed inside the protective case, with an open top and an internal receiving space; an inner casing disposed inside the outer casing and including an LED module that emits light according to an external signal; a cover part including a cover disposed on the upper side of the inner casing; a plurality of seesaw lever parts disposed on the lower side of the outer casing to raise the outer casing in a biased manner; and a sensor part including a tilt sensor disposed inside the inner casing and a plurality of pressure sensors disposed on the outer bottom surface of the protective case; and a plurality of floor signal lights. and a control unit capable of communicating with the sensor unit and LED module via wired or wireless means; wherein the control unit receives tilt information and a plurality of pressure information transmitted from the sensor unit, and detects subsidence of the ground in which the protective case is buried based on the received tilt information and a plurality of pressure information, and the seesaw lever unit comprises a straight seesaw rod arranged in the longitudinal direction of the floor signal light in the protective case; and an adjustment bolt, one end of which is connected to one end of the seesaw rod and the other end of which extends to the lower side of the cover. A floor signal light system comprising: a lifting rod, wherein one end is connected to the other end of the seesaw rod and the other end is positioned on the lower side of the outer casing; wherein the seesaw rod is rotatably coupled to a part of the protective case, and the adjustment bolt rises or falls according to the direction of rotation, and when the adjustment bolt falls and force is applied to one end of the seesaw rod, the seesaw rod rotates and the other end of the seesaw rod raises the lifting rod, thereby causing the lifting rod to raise the outer casing in a biased manner and adjusting the angle of the outer casing, thereby responding to twisting of the floor signal light caused by ground subsidence. Claim 2 A floor signal light system according to claim 1, wherein the control unit receives the tilt information and the plurality of pressure information from the sensor unit according to a preset time interval for each of the plurality of floor signal lights, calculates pressure difference information which is the difference between the preset initial pressure information and the plurality of pressure information according to each of the plurality of pressure sensors, determines whether each of the pressure difference information exceeds a preset normal pressure range, and if the number of pressure information exceeding the normal pressure range among the plurality of pressure information is greater than or equal to a preset threshold number, checks the tilt information at that point in time, and if the tilt information is different from the preset initial tilt information, determines that subsidence has occurred in the ground where the floor signal light to which the plurality of pressure information was transmitted is buried. Claim 3 A floor signal light system according to claim 1, wherein the sensor unit comprises: a tilt sensor disposed inside the inner box and measuring tilt information, which is the degree to which the bottom surface of the inner box is tilted with respect to the direction of gravity; a first pressure sensor disposed on the outer bottom surface of the protective case; a second pressure sensor disposed on the outer bottom surface of the protective case at a position different from the first pressure sensor; and a third pressure sensor disposed on the outer bottom surface of the protective case at a position different from the first pressure sensor and the second pressure sensor; wherein the first pressure sensor, the second pressure sensor, and the third pressure sensor measure the pressure applied by the ground in which the protective case is buried to the bottom surface of the protective case. Claim 4 The floor traffic light system according to claim 1, wherein the control unit compares the tilt information received from the tilt sensor with preset initial tilt information to determine whether the difference value is within a preset normal tilt range, and if the difference value exceeds the preset normal tilt range, transmits a signal to an external server. Claim 5 delete Claim 6 A floor signal light system according to claim 1, wherein the seesaw lever portion further comprises: a bulkhead having a plurality of through holes and disposed vertically with respect to the ground inside the protective case; an axle bracket fixed to the lower surface of the bulkhead; and a hinge shaft disposed horizontally with respect to the bulkhead by penetrating a part of the axle bracket; wherein the hinge shaft penetrates the axle bracket and the seesaw rod simultaneously so that the seesaw rod can rotate about the hinge shaft as an axis, the adjusting bolt penetrates the first through hole of the bulkhead and is connected to one side of the seesaw rod, and the lifting rod penetrates the second through hole of the bulkhead and is connected to the other side of the seesaw rod. Claim 7 A floor signal light system according to claim 1, wherein the seesaw rod further comprises a lowering stopper formed by protruding in the opposite direction of the lifting rod, and the lowering stopper prevents the lifting rod from descending beyond a preset distance when the lifting rod is lowered by the adjustment bolt. Claim 8 A floor signal light system according to claim 1, wherein the cover comprises a plurality of adjustment holes, which are through holes formed at positions corresponding to the adjustment bolts; and the cover portion further comprises a plurality of adjustment doors that open and close the plurality of adjustment holes, and wherein, when adjusting the adjustment bolts, the adjustment bolts can be adjusted by opening only the adjustment doors without removing the cover. Claim 9 A floor traffic light system according to claim 2, wherein the control unit transmits ground subsidence occurrence information to a server when it determines that ground subsidence has occurred, and the server, upon receiving the ground subsidence occurrence information, receives a video of the ground traffic light where the ground subsidence occurred through a CCTV that photographs the location where the ground traffic light where the ground subsidence occurred is located, transmits an alert that ground subsidence has occurred to the administrator's administrator terminal, and transmits the video of the ground traffic light where the ground subsidence occurred together with the alert.

Images