644results about How to "Avoid safety hazards" patented technology

The invention discloses a high voltage grounding tool for power maintenance, which comprises a grounding wire chuck and an operating rod, wherein the wire chuck comprises a C-shaped hanging frame, a wire clamp moving plate and a lifting rod; a connector connected with the C-shaped hanging frame is arranged at the top of the operating rod; the upper end of the lifting rod is connected with the wire clamp moving plate; a driving mechanism connected with the lifting rod is arranged in the operating rod; the operating rod is arranged in a multi-section insertion manner; locking rings are arranged among sections of the operating rod; reducer pipes are arranged among sections of a movable casing pipe; elastic pins or key structures matched with the movable casing pipe are arranged on the reducer pipes. According to the invention, the high voltage grounding tool is hung on a wire by utilizing the C-shaped hanging frame; the wire is clamped by adopting the lifting rod; the wire-off accident is prevented; the low-position safe operation is realized; the potential safety hazard caused by the climbing operation is avoided; the working difficulty is reduced; the working efficiency is improved; the sectional design concept is adopted; the flexible variation of the length of the operating rod is ensured; in the transmission link, the interchangeable connection can be carried out; the effects are obvious.

The invention relates to a serum-free fibroblast cell culture medium and a preparation method thereof, wherein the base culture medium is a DMEM culture medium or a mixture of the DMEM culture medium and a F12 culture medium, and the exogenous additives comprise hormones, a metal transporter, glutamine, a lipid concentration agent, an antioxidant, purine, saccharide and a cell growth factor. Compared with the culture medium in the prior art, the serum-free fibroblast cell culture medium of the present invention has the following advantages that: animal origin or recombinant albumin is not added so as to avoid the possibly-carried safe hidden danger and reduce the culture medium cost; the culture medium is suitable for primary culture and subculture of fibroblast cells, the good cell morphology is maintained, and the status and the function of the cultured cells are similar to the status and the function of the serum group cells; adherence factor coating is not required, the primary 24 h adherence rate is more than 60%, the passage 24 h adherence rate is more than 80%, no difference exists between the cells cultured with the culture medium of the present invention and the serum group cells; requirements of multiple passages can met, and the growth conditions of the cells after 15 passages are similar to the growth conditions of the serum group cells; and after the fibroblast cells are directly transferred into the culture of the present invention from the serum-containing culture, the cells can successfully adhere and extend without the gradual adaptation process.

The invention relates to the technical field of alarm systems, in particular to a gas alarm system with a wireless communication function. The gas alarm system comprises a gas alarm composed of an alarm outer shell, wherein the alarm outer shell is provided with an alarm control module, an alarm module and a gas sensor, and the alarm module and the gas sensor are respectively connected with the alarm control module. The gas alarm system is characterized by further comprising an alarm end wireless communication module. By means of the technical scheme, a gas supply can be cut off in time under the circumstances that fire or similar dangerous situations occur, risks of deterioration of the situations or explosions are lightened, and safety is high. Meanwhile, processes of meter reading are simplified, cost of related devices is lowered, automatic and timing meter reading is realized, manual cost is lowered, at the same time, meter reading data are more persuasive, and conflicts between users and a gas supplier are reduced.

The invention discloses a safety authentication method and a safety authentication system for a wireless network. The system comprises a signal fingerprint monitoring and processing module and a wireless network access authentication module at an access point. The method comprises the following steps that: at a network access point, the signal fingerprint monitoring and processing module performsdown-conversion and digitized sampling on a detected steady-state communication signal and extracts the conventional signal characteristic and the spurious signal characteristic of the steady-state signal by a communication signal processing method; after a higher-dimension spurious signal characteristic is reduced and optimized, the conventional signal characteristic and the spurious characteristic are fused into a steady-state signal fingerprint; and a signal fingerprint matching and safety authentication module matches the monitored steady-state fingerprint of unknown communication equipment and provides a corresponding safety strategy service according to a recognition result by a network authentication protocol. The method and the system are used for performing safety authentication on wireless communication equipment and enhancing the safety of a wireless communication network in combination with a software authentication system and have the characteristics of high concealment, high stability and safe management.

The invention discloses an extension platform component of a lift, which comprises a lifting platform and an extension platform; slide rails are arranged on both sides of the extension platform, and guide grooves cooperating with the slide rails are arranged on both sides of the lift platform, and guide grooves are arranged in the guide grooves. There are load-bearing rollers matched with the slide rail, the slide rail is provided with a rack structure, the side of the lifting platform is provided with a deceleration motor, and the deceleration motor is provided with a gear matching the rack structure; the lifting platform is provided with an outer guardrail , the extension platform is provided with an inner guardrail, and the lifting platform is also provided with a counterweight assembly; the extension platform assembly of the elevator of the present invention can be used on a lifting mechanism such as a multi-mast or a hydraulic yoke, and the extension platform can be extended during operation. , to increase the scope of work, avoiding the potential safety hazards caused by moving the elevator during operation; when the extension platform is extended, the counterweight components act in reverse to ensure the overall balance and avoid the instability of the elevator due to the shift of the center of gravity.

The invention discloses and relates to a vehicle speed limiting method and device. The vehicle speed limiting method includes the steps that whether the current driving road condition includes preset speed limiting identification or not is judged; the speed limiting value of a vehicle is calculated when the current driving road condition includes the preset speed limiting identification; and the speed-limited driving mode is started, and the driving speed of the vehicle is controlled according to the speed limiting value of the vehicle. Therefore, the driving speed of the vehicle can be automatically controlled according to the road condition information; and particularly when the current driving road condition information includes the preset speed limiting identification, the driving speed of the automobile can be limited, potential safety hazards caused when the road condition is not good are avoided as much as possible, and the driving safety of a user is better protected.

The invention discloses a dry burning prevention controlling method for a cooker. The method comprises the following steps that: a temperature sensing device in the cooker senses the temperature of the cooker, and transmits temperature signals to a controller in the cooker, and the controller judges whether the cooker is in a dry burning state according to the temperature rise difference in unit time and sends signals indicating that whether dry burning exists. According to the dry burning prevention controlling method and the corresponding cooker, the controller judges the value of temperature change in the unit time according to the temperature of the cooker sensed by the temperature sensing device; and if the temperature sharply rises in the unit time, the cooker is in the dry burning state, then the controller sends the dry burning signals to prompt a user of carrying out proper operation through voice or sends the signals to a heat source, and a controller of the heat source controls the heat source to stop working, so that potential safety hazards are avoided.

Disclosed is an intercommunication control method for heterogeneous intelligent appliances based on the identify service of Internet of Things. The method comprises: 1) an intelligent appliance product registering with an appliance controller, and the appliance controller acquiring an identifier of the intelligent appliance product; 2) when controlling the registered intelligent appliance product, the appliance controller initiating an identifier parsing request to the Internet of things identifier public service platform, and acquiring address information about an information server corresponding to the identifier; 3) the appliance controller sending a query request to the information server, so as to acquire a function menu and a control protocol type of the intelligent appliance product; and 4) according to the control protocol type, the appliance controller selecting a matched control protocol from the appliance controller, then reading the function menu by means of the control protocol, and sending a control message to the appliance product. The method supports the intercommunication control between a heterogeneous appliance controller and an appliance, so that the appliance controller of any manufacturer can control appliance products of different manufacturers.

The invention provides a method and a device for diagnosing a binding fault of a relay. The method is characterized by being applied to a high-voltage loop, wherein a power battery, a main positive relay, a high-voltage load and a main negative relay are sequentially connected in series in the high-voltage loop, and a pre-charging relay and the main positive relay are connected in parallel. The method comprises the following steps: acquiring an upper high-voltage electric signal; outputting control signals to control a first relay to be actuated and control a second relay to be disconnected, wherein the main positive relay is disconnected; acquiring voltage values of two ends of the high-voltage load in the high-voltage loop; and when the voltage values of two ends of the high-voltage load meet a fault condition, determining the binding fault of the second relay, wherein the first relay is the pre-charging relay, the second relay is the main negative relay, or the first relay is the main negative relay, and the second relay is the pre-charging relay. According to the method, the diagnosis on the binding fault of the pre-charging relay or the main negative relay is realized, and safety loopholes are avoided.

The invention provides a resource acquisition method and apparatus, a resource distribution method and apparatus, a resource downloading method and apparatus, a device, and a storage medium, and belongs to the technical field of networks. According to the method and apparatus provided by the invention, an authentication mechanism is imported for a P2P network, when different peer nodes perform communication, the peer nodes use key pairs for encryption, the resources are transmitted in the form of ciphertext in the P2P network, thus avoiding the potential safety hazard if the resources are stolen when being transmitted in the P2P network and greatly improving the security of the P2P network. Moreover, each resource can have a corresponding key pair, the resources of different users can be encrypted by using different key pairs, thereby ensuring that any user uses his own key, cannot decrypt the resources of other users, and cannot access the resources of other users as a result, so thatthe mutual isolation of the resources of different users is achieved. If the method and apparatus are applied to mirror image distribution service in public cloud, a secure mirror image distributionscheme based on the P2P network can be provided, and the isolation of tenements of the public cloud can be ensured.

The invention discloses a firmware upgrading method and device. The method comprises the following steps of obtaining a target firmware file used for upgrading a firmware; determining first summary information according to summary data recorded in the target firmware file; extracting a summary of a manufacturer firmware content recorded in the target firmware file to obtain second summary information according to a preset digest algorithm; comparing the first summary information and the second summary information; and if the first summary information is consistent to the second summary information, utilizing the target firmware file to upgrade the corresponding firmware of a hardware device according to hardware device identification information recorded in the target firmware file. Through application of the technical scheme provided by the embodiments of the invention, the potential safety hazard brought to a kernel due to firmware upgrading through the unreliable firmware file can be avoided, and the security of a computer system is improved.

The invention discloses a railway tunnel detection car, which solves the problems of potential safety hazard existence, low efficiency and great data error of the existing mode for detecting the tunnel defects and the concrete strength. The railway tunnel detection car comprises a track car body, a PC (Personnel Computer) and a geological radar host, wherein the track car body is provided with a cab and an underpan; the PC and the geological radar host are arranged in the cab; a tunnel defect detection mechanism, a tunnel concrete detection auxiliary mechanism, a tunnel inner contour illumination system, a crack detection system and a thermogram drawing system are respectively arranged in the track car body; a GPS (Global Positioning System) connected with the PC is arranged in the cab; and the tunnel defect detection mechanism, the crack detection system and the thermogram drawing system are connected with the PC. The railway tunnel detection car has the advantages that the design is reasonable; the operation is convenient; the one-step automatic detection of defects such as tunnel secondary lining concrete cracks, water seepage and empty spaces is realized; the potential safety hazards due to manual detection by workers is avoided; the detection stability, the detection efficiency and the detection precision are greatly improved; and the detection speed is greatly accelerated.

The invention relates to the field of electric detonator assembling, in particular to an assembling automatic production line for an electric detonator. The assembling automatic production line is characterized in that electric firing elements to be assembled are loaded in a first mechanical hand in groups and sent to a primary assembling station, chemical column pipes to be assembled are sent to the primary assembling station through a discharging station, a feeding station and a material taking station so as to be assembled with the electric firing elements to be assembled and sent to a detection station; a detection contact positioned on the upper portion of the detection station performs connection detection under the effect of a first cylinder and enters a marking station if connection is achieved and enters the discharging station if marking is achieved; discharging is performed directly if disconnection occurs, a second cylinder positioned on the discharging station pushes an upper press rod positioned at the upper end of the first mechanical hand to move downwards, the upper press rod drives a first hanging column positioned at the upper end of a discharging column through the discharging column to move downwards to the middle of a push plate, and the first hanging column pushes the push plate to rotate to finish discharging. Electric detonator assembling automation is achieved through the assembling automatic production line, potential safety hazard is overcome, and working efficiency is improved simultaneously.

The embodiment of the invention provides a safety authentication method of a sensor, comprising the following steps: acquiring authentication information from an on-line equipment management center, wherein the authentication information comprises a timestamp and a random number; acquiring a device identification of the sensor; sending the authentication information to the sensor so as to ask fora signature; acquiring an authentication information digitally signed by the sensor; uploading an authentication request to the on-line equipment management center, wherein the authentication requestcomprises the device identification, the authentication information and the authentication information digitally signed by the sensor; and acquiring an authentication result of the on-line equipment management center. The embodiment of the invention is correspondingly provided with a sensor and an authentication system thereof. By implementing the invention, the safety management of the sensor equipment is realized and the potential safety hazard brought by utilizing illegal sensor equipment is avoided.

The present invention relates to underground water taking and collecting method, and is new engineering structure for taking percolation water. The present invention features that the collecting well is embedded into base rock stratum for at least 5 m, controlled directional percolation holes are drilled into grit stratum under the base rock stratum around the well, and filters are set in the hole parts corresponding to the water bearing stratums. The said engineering structure makes the taken underground water need no further processing in the water producing system, and has the merits of both radiation well and natural filtering bed percolation well, including simple engineering structure, being safe and reliable, no damage to ecological environment, etc.

The invention discloses an image rendering apparatus and a method based on an RGB camera and an iris camera. The apparatus comprises a RGB camera, an iris camera, an image matching module and a display. The RGB camera is used for capturing the RGB image of a person to be identified. The iris camera is used for capturing a monochromatic image of the person to be identified. The image matching module is used for adjusting the size and the position of the RGB image according to the size and the position of the monochromatic image to generate a preview image. The display is used for displaying the preview image thereon. The invention replaces a monochromatic preview image for prompting a user to adjust the photographing position in the prior art with an RGB preview image. This, on one hand, prevents the security risks caused by the exposure of a monochromatic image with iris characteristic data to a display interface, and on the other hand, brings the user better use experience.

The invention provides an automatic out-ejecting type socket, and relates to the socket capable of automatically ejecting out a plug. The invention provides the automatic out-ejecting type socket which is simple in structure, convenient to use and capable of automatically ejecting out the plug. The automatic out-ejecting type socket comprises a circuit, a panel, a side shell and an automatic out-ejecting device. The automatic out-ejecting device is arranged inside the socket and comprises an automatic de-locking device, a pressure spring, a push plate, a position-limiting rod, two guide grooves and multiple push rods. The guide grooves are arranged on the side shell and vertical to the panel. The push plate presents to be a symmetrical quadrangle and is parallel with the panel. Two sides above the push plate are respectively provided with strip-shaped side protrusions which are arranged in the guide grooves and adaptive to the guide grooves. The automatic de-locking device is arranged below the push plate. An objective of automatically ejecting out the plug is realized.

The invention discloses a data verification method, a verification device and a mobile terminal. The data verification method comprises the steps that a receiver receives data and executes the following verification process of obtaining an ID of receiving data and looking for a data structure corresponding to the ID of the receiving data from a stored data structure; after the corresponding data structure is found, the receiving data type is obtained and compared with a stored legal data type, and the legality of the receiving data type is judged; when the receiving data type is legal, a valve of the receiving data with a limited value domain is obtained according to the data type and compared with a legal value of the stored data belonging to the type, and the legality of the value of the receiving data is judged; if the found corresponding data structure, the receiving data type and the value are legal, the receiving data is confirmed as legal data; if the found corresponding data structure, the receiving data type and the value are illegal, the receiving data is illegal data. By applying the data verification method, the verification device and the mobile terminal, the problem that verification on the legality of the receiving data cannot be performed in the prior art can be solved.

The invention discloses a multi-angle adjusting frame for a millimeter wave radar, and the adjustment frame comprises a bottom plate, an installation plate, angle adjusting mechanisms and a rotating mechanism, wherein a front end of the bottom plate is hinged to a front end of the installation plate through a hinge. The left and right sides of the bottom plate and the installation plate are symmetrically provided with the angle adjusting mechanisms, and each angle adjusting mechanism comprises an arc-shaped plate which is fixed on the bottom plate and extends upwards, and a scale which is fixed on the installation plate and extends downwards, wherein each arc-shaped plate is provided with a first arc-shaped hole, and each scale is fixedly provided with a bolt passing through the corresponding first arc-shaped hole and the bolt is provided with a locking nut. The installation plate is provided with a disc which can rotate freely, and the disc is provided with a radar body. The installation plate at one side of the disc is provided with the rotating mechanism for controlling the rotating of the disc. The adjusting frame can achieve the multi-angle adjustment of the radar body throughthe setting of the angle adjusting mechanisms and the rotating mechanism, facilitates the adjustment according to the actual use conditions, and avoids the potential safety hazards.

The invention provides a method for evaluating driving simulation safety. The method includes the steps that by forming a virtual road scene, driving operation data and corresponding scene information during multiple driving simulations in the virtual road scene are obtained; abnormal driving behaviors and corresponding road sections in the virtual road scene are determined according to the driving operation data and corresponding scene information; and the frequency of the abnormal driving behaviors occur in the each road section is counted, the road section when the frequency of the abnormal driving behavior is higher than a preset threshold value is taken as a safety hidden danger road section. In the virtual road scene, the safety hidden danger road section can be determined by simulating driving, thus the problem of the safety hidden danger in the road construction process is solved.

The invention relates to a consensus algorithm applied to an alliance chain, which can effectively solve the problems of energy waste and low transaction throughput of a blockchain system, and adoptsthe technical scheme that after a transaction occurs on a blockchain, transaction information is broadcasted to all blocking nodes; after the blocking node generates a new block, the current block isdesignated as a pre-submission state, and block information is immediately broadcasted to other blocking nodes; the other blocking nodes verify the received block information; after more than 2/3 of the blocking nodes are confirmed, the block is verified for the first time; when more than 2/3 of the producer signs the block in the first verification state successfully, the blocking chain node links the block chain to the main chain, and completing the consensus algorithm. A large number of computing power operation is avoided, a large number of resources are saved, the consensus process is high in speed, short in time and higher in efficiency, the block confirmation speed is greatly increased, and huge social and economic benefits are achieved.

The invention discloses a data communication method based on head-up display equipment in vehicular environment. The method includes the following steps that the head-up display equipment sends a reading request through a wireless communication signal; according to the sent reading request, reading information sent back by the wireless communication signal is received; the reading information is displayed on the head-up display equipment. According to the data communication method based on the head-up display equipment, the head-up display equipment sends communication requests to other equipment and receives displayed information data through wireless communication signals, the range of equipment capable of used is widened, and therefore more comprehensive information is provided for drivers and safety hidden risks during running of vehicles are eliminated.

The invention provides a speed limiting method for an intelligent automobile, wherein driving record information is stored in a Cloud server; each driver who intends to drive the intelligent automobile can obtain the driving record information stored in the cloud server through fingerprint inputting information through fingerprint inputting; as long as the vehicle-mounted system for the intelligent automobile judges the driver as a standard driver according to the driving record information, the driver can start the intelligent automobile; and the driving speed is intelligently limited according to a highest speed in the driving record information so as to avoid potential safety hazard caused by overspeed driving.

The invention provides an air supply and refrigerating system of a refrigerator. The air supply and refrigerating system comprises a top liner plate, a rear liner plate, an evaporator and a fan. The evaporator is fixedly arranged on the top liner plate, a rear air duct is arranged on the rear liner plate, a water disposal pan is arranged on the lower portion of the evaporator, the two sides of the water disposal pan wrap the evaporator and are connected with the top liner plate, a fan support is arranged on the front side of the water disposal pan, the rear side of the water disposal pan is communicated with the rear air duct, the fan is arranged on the fan support, the water disposal pan and the fan support are mutually independent parts or are respectively provided with independent space, the water disposal pan and the fan support are in mutual lap joint, and the water disposal pan, the fan support and the rear air duct form a sealed ventilation duct. The invention further provides a refrigerator with the air supply and refrigerating system. Stable airflow can be collected in the ventilation duct in the air supply and refrigerating system, heat exchange efficiency is greatly improved, the water disposal pan and the fan support are provided with independent space, condensing water is isolated from an electrical part on the fan side, water and electricity are separated, potential safety hazards are avoided, and the air supply and refrigerating system is easy to install.

The invention provides a safety control method and device for fatigue driving. The method includes the steps of monitoring the state of a driver, obtaining the current position of a vehicle driven bythe driver when it is monitored that the state of the driver is the fatigue driving state, determining target position information corresponding to the current position information, sending vehicle control prompting information to the driver and receiving an instruction of the driver, and controlling the vehicle driven by the driver according to the instruction and the target position information.By means of the method, the vehicle can be driven to a target location and then stopped when the driver is in the fatigue driving state, the driver can have a rest or replaced by another driver to drive the vehicle instead of being reminded in an acoustic-optic mode. Obviously, the potential safety hazards caused by the continuous driving of the driver in the fatigue driving state can be reducedor avoided.

The invention provides a rotor-wing-type power transmission line patrol inspection walking mechanism capable of crossing obstacles. The walking mechanism comprises a bearing board used for bearing a patrol inspection device, at least two rotor wings used for crossing the obstacles are arranged on the bearing board, the bearing board is further provided with at least two walking devices capable of moving on a power transmission line in a reciprocating mode and a control device used for controlling motions of the rotor wings and the walking devices, a worker does not need to climb a tower when the walking mechanism is to be installed on the power transmission line, and the worker seldom needs to climb. The walking mechanism can effectively cross the obstacles including the tower and does not need to be aided manually in crossing the obstacles, the distance between the obstacles and the walking mechanism can be recognized accurately, and it is guaranteed that the walking mechanism can cross the obstacles accurately; safety hidden risks caused when the worker climbs to install the walking mechanism or aids the walking mechanism to cross the obstacles are effectively avoided.

The invention relates to a novel section cut-off machine. The novel section cut-off machine comprises a base, a work table, a crossbeam guide rail, and cutting blades, wherein a plurality of shaft sleeves are arranged on the periphery of the base, and a lifting hydraulic cylinder is arranged in the center of the base; the work table is arranged above the base, and the center of the bottom of the work table is connected with a hydraulic lifting rod of the lifting hydraulic cylinder; the crossbeam guide rail horizontally arranged is arranged above the work table, and two sliding blocks are in sliding connection to the crossbeam guide rail; adjusting hydraulic cylinders fixed on the crossbeam guide rail are arranged at the side ends of the sliding blocks, and the side ends of the sliding blocks are connected with the top ends of hydraulic telescopic rods of the adjusting hydraulic cylinders; supporting tables with L-shaped sections are fixedly connected to positions under the sliding blocks, and driving motors are mounted on the supporting tables; the cutting blades are arranged at the lower ends of the supporting tables, and are fixedly connected to transmission shafts; and transmission mechanisms are mounted between the transmission shafts of the cutting blades and rotating shafts of the driving motors. The novel section cut-off machine disclosed by the invention is simple in structure, and automatically controls and adjusts the cutting blades, so that the cutting working efficiency for the sections is improved.

The invention discloses a train auxiliary monitoring system for a rail transit signal system in a failure state. The train auxiliary monitoring system comprises a signal system vehicular device, a train position information connection unit, a train-ground wireless communication network system and a control center, the signal system vehicular device is connected with the train-ground wireless communication network system through the train position information connection unit, the train-ground wireless communication network system is connected with the control center, and train position information generated by the signal system vehicular device is transmitted to the control center, analyzed by a dispatching server of the control center and then distributed to terminals. The train auxiliary monitoring system can accurately and clearly reflect accurate positions of all current trains for train dispatching command staff when the signal system fails, and driving safety of the trains is ensured.

The invention relates to the field of network security technologies and provides a method and a system of identity authentication based on Bluetooth. The method comprises the following steps that: a feature code is embedded into authentication token equipment; binding information is obtained according to user information and the feature code in the authentication token equipment of a user and is recorded on the server side; user equipment obtains the feature code in the binding information through visiting the server side; the user equipment computes the feature code and carries out Bluetooth broadcast; and after the authentication token equipment opens a power supply, Bluetooth broadcast data are monitored, a Bluetooth link is established with the user equipment according to a result matched with verification of the feature code, so that the identity authentication is provided for the user equipment. According to the system and the method, the common safety hidden trouble of the existing Bluetooth equipment is avoided, credible identity authentication of each business system can be reinforced, authority and security of data of each business system are improved, the power consumption of the authentication token equipment is saved, and meanwhile, the using experience of the user is improved.

The invention relates to an expansion joint dust collecting device and a construction method thereof. The expansion joint dust collecting device comprises a bridge body, a bridge deck and an expansionjoint cover plate and is characterized in that a dust collecting box is arranged below the expansion joint cover plate, a dust receiving plate is arranged at the top of the dust collecting box, and tiny gravels, dust and other sundries fall downwardly through the gaps of the expansion joint cover plate onto the dust receiving plate and are guided into the dust collecting box through the dust receiving plate; when the dust quantity in the dust collecting box reaches a preset value, an alarm lamp flickers to give out an alarm to remind maintenance staff to clean the dust collecting box. The expansion joint dust collecting device has the advantages that by arranging the dust collecting box below the expansion joint cover plate, the fallen tiny gravels, dust and other sundries can be completely collected in the dust collecting box, atmospheric pollution is avoided, risks caused by the fact that the tiny gravels, dust and other sundries fall off the bridge deck, and bridge safety is increased.