1659 results about "Construction worker" patented technology

An intelligent design method for a support scheme of a rock burst section in a TBM tunnel, relating to the field of tunnel engineering. The intelligent design method for the support scheme of the rock burst section in the TBM tunnel comprises: determining a surrounding rock class on the basis of TBM mainframe operation data, surrounding rock feedback evaluation, and a tunnel engineering geological survey report, and using a rock burst intensity assessment method to predict a rock burst grade; and on the basis of the surrounding rock class and the rock burst grade, using a computer deep learning technology to determine an initial surrounding rock support method. The method effectively avoids the impact of subjective factors, actively utilizes TBM mainframe operation data and surrounding rock feedback evaluation, utilizes big data processing and an artificial intelligence technology to propose an intelligently designed support scheme for a rock burst section in a TBM tunnel, and can provide an efficient support scheme for field construction workers for a rock burst section in a tunnel.

The invention discloses a construction site unsafe behavior detection method and system based on image recognition, and relates to the technical field of intelligent visual safety monitoring, and the method comprises the steps: collecting a construction image containing a constructor, carrying out the rectangular frame labeling of unsafe behaviors in the construction image, and generating a structured labeling data set; inputting the structured annotation data set into a YOLOv5 target detection model, performing training through Mosaic data enhancement and an adaptive anchor box generation algorithm, and outputting the trained YOLOv5 target detection model; based on the trained YOLOv5 target detection model, performing 128-dimensional feature vector extraction and track association matching on a detected target through a DeepSORT multi-target tracking algorithm, and outputting a track data table; and the recognition stability and behavior analysis depth of the system in a complex environment are enhanced, so that automation and intelligentization of safety management of a construction site are effectively supported.

The embodiment of the invention provides a lightweight target detection method and system based on improved YOLOv8, and the method comprises the steps: collecting a normal data set of construction personnel operation, constructing an interference data set based on the normal data set, marking and classifying the data set, and dividing the data set into a training set, a verification set and a test set; the method comprises the following steps: establishing an SVM-YOLO lightweight target detection model, and designing a network architecture of the SVM-YOLO; using a training set to set training parameters, using an Inner-MPDIOU loss function to train the constructed target detection model, and evaluating a target detection result through an evaluation index; and testing the effect of the trained target detection model by using the test set. The small target detection precision can be improved.

The invention discloses a pumped storage power station safety construction monitoring method based on image recognition, and relates to the technical field of pumped storage power station safety construction monitoring, and the method comprises the steps: carrying out the intelligent monitoring of a construction site through a high-definition camera, an unmanned plane, and a multispectral imaging device, and optimizing the target capturing capability through an environment adaptive adjustment strategy. And in combination with a deep learning and behavior analysis model, identifying construction personnel, equipment and environment states, detecting behaviors such as no safety helmet wearing, illegal retention, equipment abnormity and the like, and performing real-time tracking and updating. Based on a risk level calculation model, a multi-level alarm mechanism is constructed, acousto-optic early warning, remote alarm and task scheduling are triggered, and construction safety is optimized in combination with cloud collaborative management. And self-supervised learning and cross-scene transfer learning are adopted, so that the recognition precision and the system adaptability in a complex environment are improved. According to the method, better effects are achieved in the aspects of real-time performance and accuracy.

The invention discloses a digital twinning-based high-altitude falling risk state assessment technology for building workers and a mapping method and system. The method comprises the following steps: extracting aqueduct building engineering site space element information and personnel positions by an IFC model, and respectively inputting the information and the positions into an indoor navigation model and a three-dimensional digital model; historical risk data of an aqueduct construction engineering site are collected to analyze a risk assessment index and a preset risk threshold value; constructing a digital twinborn model according to the risk assessment index, the risk threshold value, the indoor navigation model and the three-dimensional digital model; real-time construction site environment data, worker behavior data and equipment state data are collected to update and simulate the digital twin model in real time; evaluating the risk range of the high-altitude falling risk by combining the updated and simulated results with a risk evaluation algorithm; and performing mapping association on the digital twinborn model through the construction site environment data, the worker behavior data and the risk range, performing visual interface presentation on the mapping association part, and designing a risk early warning trigger threshold.

The invention discloses a hospital basement ventilation lighting lamp and an energy-saving management and control system.The hospital basement ventilation lighting lamp comprises a lighting unit, a ventilation unit and an energy supply unit, the lighting unit comprises a light-transmitting plate and an LED lamp set, the ventilation unit comprises a motor and a fan, and the energy supply unit comprises a storage battery pack and a standby power supply. The ventilation lighting lamp and energy-saving management and control system for the hospital basement comprises a lighting module, a grouping module, a sensor module and a control module, the grouping module divides the basement into a plurality of control areas, the sensor module comprises an infrared temperature sensor, and the control module comprises a controller and an actuator. The problems that when constructors conduct construction, light of the whole construction area is turned on, but single-time construction only aims at a small area, so that energy waste of an unconstructed area is caused, meanwhile, the health of the constructors is easily affected due to the fact that the quality of air in a basement is low, and heating is easily caused due to the fact that illumination time is too long are solved.

The automatic tiling device for building construction comprises a base plate and a feeding device arranged at the top of a first bottom plate, and a paving device is arranged at the top of a second bottom plate; according to the brick tiling device, horizontally-placed bricks are rotated by a certain angle through the rotating mechanism to be in a vertical state and attached to the wall face, so that existing suction cup tiling is replaced, the bricks of various materials and sizes can be firmly adsorbed, the bricks are not prone to falling off in the conveying process, and the brick tiling device is convenient to use and high in practicability. According to the automatic tiling device, the tiling efficiency is improved, the surfaces of the attached bricks are intermittently beaten in a reciprocating mode to a certain degree through the vibration mechanism, then the surfaces of the attached bricks are evenly vibrated, the beating strength and position of each time can be guaranteed, and the tiling efficiency is improved. The tightness of full contact between the bricks and the concrete and the smoothness of attachment between the bricks are improved.

The invention provides a building engineering data information intelligent management platform which comprises an intelligent sensing module, an edge calculation module, a data management module, an AI decision module, a business application module and a safety standard module. Through the intelligent sensing module, the edge calculation module, the data management module, the AI decision module, the service application module and the safety standard module, the position of a constructor and the equipment state can be tracked in real time, personnel are prevented from entering a dangerous area by mistake and the mechanical overload risk is prevented, operation safety is guaranteed, AI quality inspection and fault diagnosis are locally processed, cloud dependence is reduced, and the working efficiency is improved. According to the method, the system and the device, real-time early warning of potential safety hazards can still be ensured when the network is interrupted, BIM, IoT and service data can be integrated in a standardized manner, information islands are eliminated, and cross-stage quality tracing and responsibility definition are realized.

The invention discloses a constructor vital sign monitoring bracelet and a monitoring method thereof, and particularly relates to the technical field of health monitoring, the constructor vital sign monitoring bracelet comprises a vital sign sensing module, an environment monitoring module, a local data processing module, a cloud analysis module, a local early warning module and a cloud early warning module; the vital sign sensing module monitors vital sign data in real time, and the environment monitoring module monitors environment information; the local data processing module performs preliminary health analysis and determines data uploading or early warning according to a result; the cloud analysis module carries out health risk assessment through a decision tree algorithm in combination with environmental factors, and the cloud early warning module determines whether to carry out positioning early warning or not according to an analysis result; the local early warning module executes a corresponding early warning strategy; according to the method, a consideration mechanism of environmental factors is introduced, and the environmental data and the vital sign data are combined, so that the health risk of the construction personnel can be evaluated more comprehensively, the risk evaluation model is dynamically adjusted, and the accuracy of health risk early warning is improved.

The invention relates to the technical field of pile foundation construction, and particularly discloses a pile foundation drilling steel casing mounting device which comprises a base and a position adjusting mechanism, the position adjusting mechanism comprises a coaxial correction assembly, a mounting hole is formed in the base, and the coaxial correction assembly comprises two clamping pieces which are symmetrically arranged up and down; the clamping piece comprises a clamping arm, a first retaining elastic piece, a rotating shaft, a first gear, a clamping plate and a second retaining elastic piece; when the first retaining elastic piece is in a natural state, the clamping arm is kept at the initial position, a clamping face used for clamping the peripheral face of the steel casing is arranged on the inner side of the clamping plate, and when the second retaining elastic piece is in a natural state, the clamping plate is located at the initial position. When the steel casing installation device for pile foundation drilling is used, the position of a steel casing can be automatically adjusted, the steel casing to be in butt joint and an embedded steel casing are coaxial, constructors do not need to continuously observe the position of the steel casing and conduct manual adjustment, and therefore the construction efficiency is improved.

The invention provides an electric power engineering full-period safety supervision method, and relates to the technical field of electric power engineering safety monitoring, and the method comprises the steps: collecting the electromagnetic field intensity and environment humidity data of a hot-line work region, obtaining three-dimensional space coordinates in real time through combining with a positioning tag on a safety helmet of a constructor, and dynamically calculating the three-dimensional boundary of a dangerous region; a comprehensive proximity index is constructed by analyzing the spatial relationship and the moving trend of the constructors and the dangerous boundary, the trend of the constructors approaching the dangerous area is judged in real time, and early warning is given out through the dynamically adjusted vibration frequency. In this way, the problems that in the prior art, dangerous area division is not accurate, monitoring of the movement trend of constructors is insufficient, and early warning response is single can be solved, and the safety monitoring capacity of the hot-line work environment is greatly improved.

The invention relates to the technical field of safety management and control, in particular to a multi-source data fusion water conservancy project construction safety analysis system and method.The method comprises the steps that firstly, whether work starting can be conducted or not is judged according to an overall construction environment index, and construction progress data of the day are obtained and processed in the work starting state; the safety monitoring item vector and the safety monitoring equipment vector of the day are obtained, the safety monitoring equipment vector of the day comprises equipment keys and equipment values, the equipment keys represent equipment numbers, and the equipment values represent equipment safety values; then, a constructor positioning data set is obtained and processed, a constructor track point distribution map is obtained, clustering analysis is carried out, and a constructor gathering center is obtained; and obtaining and processing a safety monitoring item vector of the day, a constructor fatigue value and a water conservancy project monitoring value of the constructor gathering center to obtain an accumulated safety value in the region, and if the accumulated safety value is smaller than a preset safety threshold, sending out a safety early warning. Through the method provided by the invention, the monitoring efficiency of the construction safety of the water conservancy project is improved.

The invention provides a construction site personnel risk identification method and system based on image processing, and relates to the technical field of risk identification, and the method comprises the steps: collecting the real-time, working condition and personnel image data of a construction site, dividing a region into a plurality of risk regions, and working condition data such as site materials, equipment operation and fire-fighting supplies are combined to calculate a risk assessment value according to a preset proportion, and a risk assessment area is determined through scoring. The personnel image data are preprocessed to obtain personnel behavior data, behavior prediction probability data are obtained through a behavior prediction model, a danger judgment value is calculated according to the behavior prediction probability data and a risk assessment area, early warning is triggered if the danger judgment value exceeds a threshold value, and an optimization feedback mechanism is further arranged to record an early warning event to optimize an early warning mechanism. According to the method, the risk judgment values of the behavior risk data and the behavior probability data in the plurality of risk assessment areas are calculated, and early warning is performed according to the risk judgment values, so that the timeliness and accuracy of risk early warning are enhanced, and the safety of building workers can be further guaranteed.

The invention discloses a supervision and management method for construction operation and a pre-class education supervision system, and relates to the technical field of data processing. Firstly, learning videos corresponding to all construction workers in the supervision and management system are obtained through matching, and then progress data in learning hosts of all the construction workers are analyzed, so that the safety awareness of the construction workers can be evaluated; and then the safety data of each construction work subordinate sub-region and the behavior characteristic data of each construction worker are analyzed, so that the pre-class education learning effect of the construction worker in the actual work process can be analyzed, potential safety hazards can be identified, the working strategy can be adjusted in time, the accident risk is reduced, and the working efficiency is improved. And finally, comprehensively analyzing to obtain a learning effect evaluation value of the supervision and management method for the construction operation, and further adjusting the supervision and management method, so that the management process can be continuously optimized, and the safety awareness of construction personnel is further improved.

The invention discloses a multifunctional water retaining device for water conservancy construction, and relates to the technical field of water conservancy projects, the multifunctional water retaining device comprises a base and a first water retaining plate fixed at the top end of the base, a plurality of ground nails are arranged at the bottom end of the base, a self-adjusting assembly and a buffering assembly are arranged in the first water retaining plate, and the buffering assembly is located below the self-adjusting assembly; the self-adjusting assembly comprises an open groove formed in the first water baffle, and a second water baffle is installed in the open groove in a sliding mode. The situation that the height of a traditional water baffle is fixed and cannot be automatically adjusted according to the change of the water level, so that when the water level is higher than the water baffle, the water overflows from the top of the water baffle, and equipment and materials are damaged can be avoided, meanwhile, manual intervention can be reduced, the psychological pressure of constructors can be relieved, the working intensity is reduced, and in an emergency, the construction efficiency is improved. And workers can timely evacuate or take corresponding protection measures, so that the safety can be effectively improved.

The invention relates to the technical field of tunnel construction intelligent supervision, in particular to a tunnel construction intelligent supervision system and method based on an intelligent safety helmet. The sensing unit is used for collecting data of positions and working environments of constructors; the communication unit is used for transmitting the collected data through a wireless communication protocol; the edge calculation unit performs edge calculation on the data transmitted by the communication unit for real-time analysis, analyzes positioning information through a centroid method, and introduces personnel density and material stacking weight to optimize calculation of centroid coordinates, so as to reduce the influence of signal change in positioning information calculation, the edge calculation unit comprises a trajectory prediction module, a contour construction module and a collision early warning module. According to the design, positioning information is analyzed through a centroid method, the positions of constructors can be tracked, and each worker can be rapidly positioned especially in a complex and changeable tunnel environment.

The utility model relates to the technical field of hanging basket frames, and discloses a construction hanging basket frame which comprises a bottom plate, stand columns are fixedly installed at the four corners of the top of the bottom plate, a fixing rod is fixedly installed between every two adjacent stand columns, and a plurality of protective fences are fixedly installed between the fixing rods and the bottom plate at equal intervals. A hydraulic cylinder is arranged in the middle of the bottom plate, the output end of the hydraulic cylinder is fixedly connected with a supporting plate, the supporting plate is arranged among the multiple stand columns in a sliding mode, and the protective fence penetrates through the supporting plate. The mounting groove is formed in the bottom plate, the hydraulic cylinder and the supporting plate are arranged in a matched mode, the hydraulic cylinder can drive the supporting plate to move up and down by starting the hydraulic cylinder, the distance between the supporting plate and the fixing rod can be adjusted, and therefore the protection effect on constructors of different heights is improved; the influence on the construction operation of constructors is avoided, and the practicability of the device is improved.

The application relates to the technical field of wall body dismantling, and discloses a building wall body dismantling device capable of guaranteeing the completeness of old bricks, which comprises a surrounding wall and a bearing box, further comprises a dismantling unit arranged on the bearing box, the dismantling unit comprises a flattening component and a cutting component arranged in the bearing box; the flattening component comprises shafts arranged on the inner walls of the bearing box, deflection frames arranged on the shafts, and a plurality of connecting rods arranged on the inner walls of the deflection frames; through the dismantling unit, a construction worker can divide a wall body into a plurality of wall body units when dismantling the wall body, and slowly lays down the single wall body units one by one, and through the cutting unit, the wall body units after being laid down are cut in the horizontal direction, the wall body units are divided into strips one by one, and then the strip-shaped wall bodies are cut into single bricks, so that the safety during the dismantling of the wall body is effectively improved, the completeness of the bricks is guaranteed, the construction cost is reduced, and the utilization rate of resources is improved.

The utility model relates to a cast-in-situ bored pile construction operation platform. The cast-in-situ bored pile construction operation platform comprises a platform base and a turnover platform plate. Wherein the platform base comprises a platform top plate and a plurality of supporting legs, the supporting legs are fixedly arranged at the bottom of the platform top plate, and a center hole is formed in the middle of the platform top plate; the two overturning platform plates are hinged to the upper surface of the platform top plate, the two overturning platform plates are symmetrically arranged, and the two overturning platform plates are used for covering the upper portion of the center hole; and semi-circular grooves are correspondingly formed in the opposite sides of the two overturning platform plates correspondingly, and when the two overturning platform plates cover the center hole, the two semi-circular grooves are spliced to form a circular hole. According to the cast-in-situ bored pile construction operation platform, a working platform can be provided for constructors in the construction process, the safety of the constructors is ensured, inclination or displacement in the drilling or pouring process can be prevented, the drilling and pile forming quality is improved, and the construction efficiency is improved.

The invention relates to the technical field of tunnel safety monitoring, in particular to an intelligent safety step monitoring method and system for tunnel construction safety control, and the system comprises a sensor arrangement module, a data collection and transmission module, a safety step intelligent analysis and early warning module and a dynamic control module. According to the tunnel safety-oriented safety step pitch monitoring method and system, various high-precision sensors are arranged at key positions of the tunnel, and advanced data transmission and intelligent analysis technologies are utilized, so that key information such as the safety step pitch and the stress state of surrounding rock can be accurately obtained in real time. Once the safety step is close to or beyond a reasonable range, the system immediately triggers multi-channel early warning, so that constructors can know potential dangers in the first time and take countermeasures in time, serious safety accidents such as tunnel collapse are effectively avoided, and the life safety of the constructors is greatly guaranteed.

The invention discloses a building safety education training system based on interactive experience, relates to the technical field of construction site safety education, and aims to solve the problems that traditional building worker safety education lacks pertinence and is difficult to meet specific safety requirements of various types of work, and the teaching mode is relatively single. The system comprises a database, a personalized learning recommendation module, an interactive learning module and a learning progress and achievement tracking module. The database is used for pre-storing safety knowledge of various construction work types; the personalized learning recommendation module is used for screening and recommending learning content suitable for the worker from a pre-stored database covering safety knowledge of various construction work types according to the work type information and learning history of the construction worker, and the learning content comprises a document and a video course. The method has the advantages that precise education content conforming to the work type and the knowledge level of each worker is provided for the worker, and the safety awareness and the skill level of the building worker are improved.

The invention provides a waterproof glass curtain wall structure of a building facade, which comprises a movable supporting assembly and a dynamic sealing system, and the movable supporting assembly is communicated with the dynamic sealing system. The movable supporting assembly is fixedly connected to the curtain wall unit, so that the curtain wall unit can slide in the indoor direction. The dynamic sealing system comprises a sealing assembly, and the sealing assembly maintains the sealing state between the adjacent curtain wall units through self deformation. The sealing assemblies are located on the peripheral wall face of the curtain wall unit and form a first sealing assembly and a second sealing assembly, and the deformation amount of the first sealing assembly is larger than that of the second sealing assembly. Therefore, by arranging the movable supporting assembly, the curtain wall unit is transferred into a room to be disassembled, by arranging the dynamic sealing system, impurities are effectively prevented from invading the curtain wall unit, and the structure of the curtain wall unit in the vertical direction is more stable. Constructors do not need to carry out high-altitude hanging operation for many times, and the construction safety is improved.

The invention discloses a construction site dispatching command center based on an AR (Augmented Reality) algorithm, and relates to the technical field of RFID (Radio Frequency Identification Device) and digital twinning, which comprises the following steps that: each constructor wears an RFID tag with a unique ID (Identity), collects and uploads related data in real time, filters invalid data and converts signal intensity into a physical distance; calculating the accurate position of each constructor, mapping the calculated position data of the constructors to the actual physical coordinates of the monitoring area through a digital twin technology, and displaying the actual physical coordinates on a digital twin large screen; and data is updated in real time, and a manager monitors the position of the manager in real time through a large screen and obtains abnormal information in time. According to the method disclosed by the invention, the real-time position information of the construction personnel is visually presented on the monitoring large screen by combining the digital twinborn technology, so that the monitoring visualization effect is enhanced, the limitation that the traditional video monitoring depends on manual visual observation is avoided, the supervision complexity is reduced, and the monitoring is more efficient and accurate.

The utility model discloses an assembly type vertical prefabricated part which comprises a part body, a transparent pipe which is communicated with a grouting cavity in the part body and used for monitoring grouting quality is embedded in the part body, and scale marks are arranged on the transparent pipe and exposed out of the surface of the part body. Visualization in the grouting process is achieved, the grouting quality of the connecting position of the vertical prefabricated parts is guaranteed, and the reliability and safety of an assembly type structure are improved; and meanwhile, construction workers can observe the grouting condition of the prefabricated part in time, grouting materials are saved, and economic benefits are improved.

The invention belongs to the technical field of building engineering, and relates to building structure reinforcing construction equipment and a construction method.The building structure reinforcing construction equipment comprises a supporting base, a lifting assembly is installed on the supporting base, a rotating assembly is slidably installed on the lifting assembly, an overturning assembly is fixedly installed on the rotating assembly, and a clamping assembly is movably installed at the end of the overturning assembly; the clamping assembly comprises a folding assembly and a plurality of self-tightening assemblies, the folding assembly and the end of the overturning assembly are movably installed, the multiple self-tightening assemblies are installed on the folding assembly and clamp the reinforcing steel plate, and air nail guns are installed at the two ends of the folding assembly. By integrating the functions of lifting, rotating, overturning, clamping and mounting and fixing, constructors can quickly adjust the position and angle of a reinforcing steel plate, so that the reinforcing steel plate is precisely attached to wall cracks, wall cracks of different heights and angles can be coped with, the construction flexibility and adaptability are improved, the safety risk in the construction process is effectively reduced, and the construction efficiency is improved. And the life safety of constructors is protected.

The invention discloses a building labor constructor access identification device, and relates to the technical field of identification devices, the building labor constructor access identification device comprises a bottom plate, the top of the bottom plate close to one side edge is provided with a blocking assembly used for preventing people from randomly accessing; according to the building labor service constructor access identification device, when a worker needs to enter a construction site on a building labor service construction site, firstly, the corresponding finger is inserted into the corresponding rubber sleeve, so that one end of the fingerprint surface of the finger is erected on the surface of the compression-resistant frame; the high-pressure water source is used for cleaning fingerprints, and then hot air is used for heating and air-drying the fingerprint surfaces of the fingerprints, so that the fingerprints can be scanned and identified through the optical fingerprint sensor, and normal reading of the fingerprints is effectively prevented from being influenced by dirt on the hands of building workers; the problem that in the prior art, most building labor service constructor access recognition devices do not have the fingerprint cleaning function, and fingerprint recording errors are likely to be caused is solved.

An optical fiber movable connector and an optical fiber connection and assembly method. The optical fiber movable connector is used for being assembled to an optical fiber to be connected, and comprises a tube pass-through connection unit, which comprises a pulling sheath (1), a ferrule assembly, a stopper (3) and a tail sleeve (4) which are coaxially arranged, said optical fiber being detachably connected to one end of the tail sleeve (4), the other end of the tail sleeve (4) being connected to the stopper (3), one end of the stopper (3) being sleeved on the ferrule assembly, and the other end of the stopper (3) being detachably connected to the pulling sheath (1); and a discrete part unit, which is used for being assembled to the tube pass-through connection unit, the discrete part unit comprising a dust cover (5), an SC outer shell (6) and an SC inner shell (7). The optical fiber movable connector is a cheaply pre-fabricated, small-sized and pullable tube pass-through assembly, which can significantly enhance the convenience for construction workers; after completion of tube passing-through, the optical fiber movable connector no matter being applied to on-site reservation or on-site assembly can make subsequent installation more convenient; and during processes of tube pass-through or wall pass-through for indoor access, the optical fiber movable connector makes optical fibers less likely to bend.

The utility model discloses a conveying skid calibration gauge, which comprises a main frame, a longitudinal beam positioning piece, a pin detection assembly and a hand lifting rod, and is characterized in that the main frame is provided with a first direction consistent with the longitudinal direction of a conveying skid and a second direction consistent with the transverse direction of the conveying skid; the longitudinal beam positioning pieces are oppositely arranged at the two ends of the bottom of the main frame with the first direction as the symmetry axis, the hand lifting rod is connected to the main frame and arranged in the second direction, and the pin detection assembly is connected to the main frame and comprises a V-shaped detection block. The calibration gauge for the conveying skid can be used for detection and calibration of the conveying skid, can be used for regular maintenance, detection and calibration in the operation process, and can reduce the number of construction workers, reduce the working intensity of detection and calibration adjustment, shorten the project implementation period and optimize the operation and maintenance time.

【Problem】An object of the present invention is to provide a marker holder that enables a construction worker during work to easily separate and combine a cap and a marker body, and that is less likely to damage the peripheral surface of the cap due to holding. 【Solution means】The marker holder of the present invention has openings formed at both ends, and penetrates the marker body while allowing at least a part of the base end side portion of the marker body to protrude from one end side opening and at least a part of the tip end portion of the marker body to protrude from the other end side opening, and supports the grip portion of the marker body in a posture along the axial direction. A first cylinder, fixed to the other end of the first cylinder, having a through hole in which the cap is disposed, the inner diameter of which is larger than the inner diameter of the first cylinder, so that a step surface that faces the other end side in the axial direction at the boundary with the first cylinder and interferes with the opening peripheral edge of the cap when viewed from the axial direction is formed. A second cylinder, and a lid fixed to the second cylinder and closing the other end side opening of the second cylinder. 【Selected drawing】Figure 5