Distribution box protection method for building construction site

Abstract

The invention provides a power distribution box protection method for a building construction site, and belongs to the technical field of power distribution boxes for construction, and the method comprises the following steps: S1, collecting and recording multi-dimensional environmental parameters of a construction area, evaluating a risk index, and planning a mounting point of a power distribution box; s2, according to the risk index obtained in the S1, selecting and executing an adaptive scheme from historical items; s3, arranging a protective shed integrated with a sensor and a fire extinguishing mechanism outside the distribution box mounting point at the distribution box mounting point; s4, then, a distribution box is installed in the installed protection part through a three-point leveling method, a gap between a box body and the ground is filled with elastic sealant, a first buffering and sealing layer is formed, and a cable passing hole is processed through a layered plugging method from inside to outside; and S5, a double-track inspection mechanism is used for inspection, a protection strategy is adjusted according to an inspection result and external data input, and the problems that a targeted protection scheme is lacked before installation, and a protection structure cannot be inspected and reinforced in time are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of electrical distribution boxes for construction, and more specifically, relates to a method for protecting electrical distribution boxes used on construction sites. Background Technology

[0002] On construction sites, the safety of electrical distribution boxes is crucial. Current technologies for protecting distribution boxes are typically simple and passive, with common practices including erecting makeshift rain shelters and setting up warning signs. These methods fail to conduct risk assessments based on specific environmental parameters before installation and develop tailored protection plans. The uniformity of these measures results in limited effectiveness, leading to a lack of timely inspection and reinforcement of the protective structure after high-risk periods or before severe weather, posing safety hazards. Therefore, a method for protecting electrical distribution boxes on construction sites that can be adjusted according to environmental parameters and weather conditions is needed. Summary of the Invention

[0003] This invention provides a method for protecting electrical distribution boxes at construction sites, which solves the problem of lacking targeted protection plans before installation, resulting in the inability to inspect and reinforce the protective structure in a timely manner after high-risk periods or before severe weather.

[0004] In view of the above problems, the technical solution proposed by the present invention is as follows:

[0005] This invention provides a method for protecting electrical distribution boxes at construction sites, comprising the following steps:

[0006] S1. Before installing the distribution box and its protective shed, collect and record multi-dimensional environmental parameters of the construction area, assess the risk index, and plan the installation points of the distribution box.

[0007] S2, based on the risk index obtained from S1, selects and executes an adaptation plan from historical projects;

[0008] S3, a protective canopy integrating sensors and fire extinguishing mechanisms is installed outside the distribution box at the planned installation point;

[0009] S4. Subsequently, inside the installed protective shed, the distribution box was installed using the three-point leveling method. After leveling, elastic sealant was immediately filled into the gap between the box and the ground to form the first buffer and sealing layer. The cable passage hole was treated using the layered sealing method from the inside out to complete the final installation and fixing of the distribution box inside the protective shed.

[0010] S5 establishes a dual-track inspection mechanism based on construction progress to conduct inspections, and dynamically adjusts protection strategies based on inspection results and external data input.

[0011] As a preferred technical solution of the present invention, the multi-dimensional environmental parameters in step S1 include: the terrain elevation of the installation point and drainage conditions;

[0012] The main types of operations and their risk levels within a 50-meter radius;

[0013] And to obtain historical meteorological data for the region.

[0014] As a preferred technical solution of the present invention, the risk index in step S1 is generated by the on-site safety officer matching the current environmental parameters with historical project files and directly referencing the verified project data in the historical scenario as the current risk index. The risk index includes at least waterproof rating, impact resistance rating, and fire resistance rating.

[0015] As a preferred embodiment of the present invention, the protective shed in step S3 includes a main frame, a top plate installed on the top of the main frame, a bottom frame installed at the bottom of the main frame, and a fire extinguishing mechanism and a sensor installed on the top plate. The main frame is assembled from several steel pipes, and its shape is adapted to the shape of the distribution box, while maintaining a gap for air circulation between them. L-shaped support rods are bolted between the steel pipes of the main frame, and the support rods are connected to each other by short steel pipe bolts. The bottom frame is composed of several steel pipes bolted together in a grid pattern, and the bottom frame is bolted to the ground.

[0016] As a preferred embodiment of the present invention, an extension baffle is provided on all four sides of the top plate. The extension baffle is connected to the top plate by a movable hinge. At least two movable hinges are provided between one extension baffle and the top plate. Long bolts / screws are provided between the movable hinges on the same side. The cross-section of the extension baffle is a "triangular" design.

[0017] In a preferred embodiment of the present invention, both the sensor and the fire extinguishing mechanism are bolted to the inner side of the top plate, located above the distribution box. The sensor includes a temperature sensor and a smoke sensor. The fire extinguishing mechanism includes a feed pipe connected to the fire extinguishing agent storage tank, a fire extinguishing agent nozzle, a release pipe located between the fire extinguishing agent nozzle and the feed pipe, and a solenoid valve disposed between the fire extinguishing agent nozzle and the release pipe. The feed pipe passes through the top of the main frame and is threaded into the main frame. The fire extinguishing agent nozzle and the solenoid valve are bolted to the top plate via a mounting bracket.

[0018] As a preferred embodiment of the present invention, the signal lines of the temperature sensor and the smoke sensor are directly led to a dedicated linkage control box. The linkage control box is installed on one side of the solenoid valve, and the output end of the linkage control box is directly connected to the shunt trip coil of the main circuit breaker in the distribution box and the solenoid valve. The linkage control box includes a multi-channel relay or multiple independent relays and auxiliary components.

[0019] As a preferred embodiment of the present invention, the operation process of sealing the cable passage hole in step S4 is as follows:

[0020] S41, first apply long-lasting waterproof adhesive evenly to the inner wall of the wire hole;

[0021] S42, then select the matching rubber sheath or threaded sealing connector according to the cable diameter for installation;

[0022] S43. Finally, insulating putty is used to wrap and shape the outside of the interface to prevent rainwater from flowing back along the cable.

[0023] As a preferred embodiment of the present invention, the dual-track inspection mechanism in step S5 specifically includes:

[0024] Routine inspections are conducted every 7 days, with a comprehensive check focusing on whether the sealant has aged and cracked, whether the protective canopy structure is stable, and whether the sensors are functioning properly.

[0025] Event-driven inspections require a special inspection to be conducted within 24 hours of the completion of pre-set high-risk operations (such as foundation pit excavation, concrete pouring, steel structure hoisting, and large-scale demolition) to focus on assessing whether the enclosure has structural deformation or sealing damage.

[0026] As a preferred technical solution of the present invention, the external data input in step S5 is achieved by setting up a physical weather warning terminal in the safety duty room at the construction site. The terminal is directly connected to the data interface of the local meteorological bureau through a wired network to receive and display the weather forecast and disaster warning for the next 1-6 hours in real time. According to the warning level displayed by the terminal, the safety officer manually initiates a temporary reinforcement inspection command and notifies relevant personnel to tighten the protective shed.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) By establishing a historical protection archive and matching environmental parameters, this invention achieves precise deployment of protection schemes, reduces risks from the source, and uses a linkage control box to enable sensor signals to directly drive the shunt trip unit and solenoid valve. The entire response process is faster and is not affected by complex network signals on the construction site. It has extremely high reliability and effectively avoids the spread of fire and secondary accidents.

[0029] (2) This invention uses a dual-track system of routine inspection and event-driven inspection, combined with external data input from physical meteorological early warning terminals, to make inspection work no longer a rigid task, but an intelligent activity that can keep up with construction dynamics and changes in the natural environment, which greatly improves the timeliness and effectiveness of safety management.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating a method for protecting electrical distribution boxes at construction sites, as disclosed in this invention.

[0032] Figure 2 This is a schematic diagram of the overall structure of the protective shed for a method of protecting electrical distribution boxes at construction sites, as disclosed in this invention.

[0033] Figure 3 This is a schematic diagram of the overhead structure of a protective shed for a method of protecting electrical distribution boxes at construction sites, as disclosed in this invention.

[0034] Figure 4 This is a cross-sectional structural schematic diagram of the protective shed for a method of protecting electrical distribution boxes at construction sites disclosed in this invention;

[0035] Figure 5 This is an enlarged view of part A of the cross-sectional structural diagram of the protective shed for a method of protecting electrical distribution boxes at construction sites disclosed in this invention.

[0036] Figure 6 This is a block diagram of the sensor and fire extinguishing mechanism linkage in a method for protecting electrical distribution boxes at construction sites disclosed in this invention.

[0037] Figure 7 This is a schematic diagram of the plan structure of a protective shed for a method of protecting electrical distribution boxes at construction sites, as disclosed in this invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Protective canopy; 11. Main frame; 12. Top plate; 13. Bottom frame; 14. Support rod; 15. Extension baffle; 2. Fire extinguishing mechanism; 21. Feed pipe; 22. Release pipe; 23. Extinguishing agent nozzle; 24. Solenoid valve; 25. Linkage control box; 26. Mounting bracket; 3. Sensor; 4. Distribution box; 5. Ground at the installation location. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Example 1

[0045] See attached document Figure 1-7 As shown, the present invention provides a technical solution: a method for protecting electrical distribution boxes at construction sites, comprising the following steps:

[0046] S1. Before installing the distribution box 4 and the protective shed 1, use appropriate equipment to collect and record multi-dimensional environmental parameters of the construction area, including the terrain elevation and drainage conditions of the installation point; the main types of operations and their risk levels within a 50-meter radius (e.g., divided into high-altitude operation areas, material handling channels, concrete pumping points, and welding operation areas); and obtain historical meteorological data of the area (e.g., average annual precipitation and number of extreme wind days). Assess the risk index. The risk index is generated by the on-site safety officer matching the current environmental parameters (e.g., the edge of the foundation pit, adjacent welding area, rainy season) with historical project files (e.g., the 2019 foundation pit distribution box 4 protection plan of XX project), directly referencing the verified project data in this historical scenario as the risk index for this installation point. The core principle of this process is to learn from past successful experiences.

[0047] The specific steps for determining the risk index are as follows:

[0048] S11. Establish a historical protection archive. Before the project starts, collect and organize the protection schemes of the distribution box 4 of the past completed projects as an archive. Each record should include at least: project name, construction stage, detailed environmental parameters of the distribution box 4 installation point (such as terrain, surrounding work type), specific basic protection scheme adopted (such as cushion material and thickness, base type), and the final evaluation of the protection effect of the scheme throughout the entire construction period (such as "excellent", "good", "potential hazards").

[0049] The historical protection archive is divided into electronic and paper versions. The electronic database archive requires a simple program to be run on a computer or handheld device. By entering keywords on the computer or handheld device, the electronic archive can be built using the simple free archive tool. The software automatically lists historical cases from high to low relevance. You can click to view them. The system automatically backs up the data every day by default.

[0050] The paper archive organizes historical project cases into tables or documents, indexed by keywords such as terrain, work type, and season (rules: the paper archive cabinet has 3 layers of labels: first layer for terrain (low-lying / flat / sloping); second layer for work at heights / hoisting / welding / pumping; third layer for season (rainy / dry / winter)). The safety officer retrieves the corresponding folder based on the label combination. If a folder contains ≥2 cases, the higher rating (waterproof, fireproof, etc.) is used; if a folder is empty, the folder with the worst environment (label = low-lying + hoisting + rainy season) is used as a reference). The safety officer then selects the appropriate folder based on the (terrain, work type, season) for the new installation site. Keywords: Locate all historical case records containing the same or similar keywords in the filing cabinet, and read through each selected case record one by one. If a case with a highly similar environmental description and excellent effect evaluation is found, the risk index and protection plan of that case are directly adopted. If multiple similar cases are found, but the effects are different, the principle of choosing the higher one is adopted. For example, if one case uses medium waterproofing and the other uses high waterproofing and the effect is excellent, then the new site should choose high waterproofing. If no similar cases can be found, the safety officer sets the risk index for the new site based on their own experience and with reference to successful solutions in the worst environments in the archive.

[0051] S12, On-site Assessment and Parameter Quantification: At the planned installation point of the distribution box 4 in the new project, the safety officer will use a standardized assessment form to conduct an on-site inspection and record the findings. This form will convert multi-dimensional environmental parameters into comparable ratings; for example:

[0052] Topographical parameters: Low-lying areas prone to water accumulation = 3 points, flat areas = 2 points, sloping areas prone to drainage = 1 point;

[0053] Surrounding operation parameters: High-frequency vibration zone (such as pump truck operation point) = 3 points, general operation zone = 2 points, quiet zone = 1 point;

[0054] Meteorological risk parameters: Based on the season in which the construction plan takes place and referring to historical meteorological data, construction during the rainy season = 3 points, and construction during the dry season = 1 point;

[0055] S13, File Matching and Risk Index Determination: After summarizing the scores of various parameters at the current installation point, the safety officer compares them with cases in the historical protection file database to find historical cases with the most similar environmental characteristics (i.e., the closest combination of scores of various parameters). The officer then comprehensively analyzes the protection schemes adopted in these similar cases that have been verified as effective to directly determine the risk index of the new installation point.

[0056] For example: if most similar cases have adopted high waterproofing solutions and achieved good results in low-lying, water-prone, and rainy season environments, then the waterproofing level of the new installation point is determined to be high. Similarly, the impact resistance level and fire resistance level are determined.

[0057] The risk index should include at least waterproof rating, impact resistance rating, and fire resistance rating, and the installation point of distribution box 4 should be planned.

[0058] For example, for installation points with high waterproof ratings, a sand and gravel moisture-proof pad with a thickness of not less than 150mm is pre-laid at the bottom of the box, and a drainage slope of not less than 3% is constructed to guide surface water away from the box foundation.

[0059] For installation points with high impact resistance (such as those near tower cranes or transport channels), an elastic base with built-in rubber shock-absorbing pads is pre-embedded at the installation point to absorb and mitigate any subsequent mechanical impacts.

[0060] The historical protection archive update mechanism involves generating a complete "Summary Report on the Protection Effect of Distribution Boxes" for each distribution box after the completion of each project. The report includes: the initial risk index, all protective measures adopted, inspection records throughout the construction period, and the final effect evaluation. Cases with an effect evaluation of "excellent" or "good" are added to the historical protection archive as successful cases. For cases where problems occurred during protection, the causes must be analyzed and improvement measures recorded as important references.

[0061] S2, based on the risk index obtained from S1, select and execute the appropriate solution from historical projects. Based on the waterproof rating, impact resistance rating, and fire resistance rating given in S1, retrieve the corresponding basic protection solution data from the historical protection archive and execute at least one of the following measures recorded in the basic protection solution data, such as laying a moisture-proof mat layer of a specific thickness, pre-embedding an elastic base with built-in shock-absorbing pads, or adjusting the reinforcement parameters of the protective shed.

[0062] S3, Install a protective canopy 1 outside the distribution box 4 that integrates sensor 3 and fire extinguishing mechanism 2 at the planned installation point. The distribution box 4 is protected by the linkage between sensor 3 and fire extinguishing mechanism 2.

[0063] The linkage process includes: when any sensor 3 detects an abnormality (sudden temperature rise or smoke concentration exceeding the standard, such as temperature >70℃ or smoke concentration >5%obs / m), it triggers a relay to generate a switch signal. The switch signal directly initiates two actions: cutting off the air switch of the main power supply of the distribution box 4 (achieved by connecting a shunt trip unit); and connecting the circuit of the solenoid valve 24 of the fire extinguishing mechanism 2 to release the fire extinguishing agent through the release pipe 22. At the same time, the circuit of the external alarm horn is also connected synchronously to issue an audible and visual alarm. This hard-wired connection method has a fast response speed, high reliability, and is not affected by network signals. All hard-wired connections use copper core PVC insulated flexible wire.

[0064] S4. Subsequently, inside the installed protective shed 1, the distribution box 4 is installed using the three-point leveling method. A level is used for calibration to ensure that the vertical deviation of the box is ≤1°. After leveling, elastic sealant is immediately filled into all the gaps between the box and the ground or the bottom frame 13 to form the first buffer and sealing layer. The cable passage hole is treated using the layered sealing method from the inside to the outside to complete the final installation and fixation of the distribution box 4 inside the protective shed 1.

[0065] The specific operation of the three-point leveling method is as follows: The foundation of the distribution box usually has three adjustable support points. Place the level on the top plane of the box, first adjust the first support point so that the bubble of the level is roughly centered, then adjust the second support point at the diagonal position, finely adjust the level in this direction, and finally adjust the third support point so that the box body meets the requirement of vertical deviation ≤1° in all directions. This method is efficient and easy for on-site workers to master.

[0066] The adjustable support points can be implemented using the following physical structures:

[0067] Option A (Adjustable Bolt Type): Three sections of coarse threaded steel with adjusting nuts are embedded in the pre-embedded concrete base. The height of the distribution box bracket can be precisely adjusted by turning the nuts.

[0068] Option B (Precast Block and Shim Type): Using common precast concrete blocks (such as sand-lime bricks with the same grade) or steel shims of different thicknesses as adjustment media, first roughly position the box body, and gradually adjust the verticality deviation of the box body to ≤1° by wedging in or replacing precast blocks / shims of different thicknesses at different support points, combined with level measurement.

[0069] The procedure for sealing cable passage holes is as follows:

[0070] S41, first apply long-lasting waterproof adhesive evenly to the inner wall of the wire hole;

[0071] S42, then select the matching rubber sheath or threaded sealing connector according to the cable diameter for installation;

[0072] S43. Finally, insulating putty is used to wrap and shape the outside of the interface to prevent rainwater from flowing back along the cable.

[0073] S5, establish a dual-track inspection mechanism based on construction progress for inspection, including:

[0074] Routine inspections are conducted every 7 days, with a comprehensive check focusing on whether the sealant has aged and cracked, whether the structure of protective canopy 1 is stable, and whether sensor 3 is functioning properly.

[0075] Event-driven inspections require a special inspection to be conducted within 24 hours of the completion of pre-set high-risk operations (such as foundation pit excavation, concrete pouring, steel structure hoisting, and large-scale demolition), with a focus on assessing whether the enclosure has structural deformation or sealing damage.

[0076] Based on the inspection results and external data input, the external data input is achieved by setting up a physical meteorological early warning terminal in the safety duty room at the construction site. This terminal is directly connected to the data interface of the local meteorological bureau via a wired network, receiving and displaying real-time weather forecasts and disaster warnings (such as rainstorms and strong winds) for the next 1-6 hours. According to the warning level displayed on the terminal, the safety officer manually initiates temporary reinforcement inspection instructions (manual initiation has a very short human response time, but by solidifying the early warning response measures into standard operating procedures, the safety officer does not need to make decisions, but only needs to follow the process, which greatly shortens the judgment time. Moreover, the meteorological early warning provides warning information for the next 1-6 hours, leaving sufficient preparation window for human response. Its core value lies in early warning and prevention, rather than requiring a second-level response). The relevant personnel are notified to tighten the protective shed 1. This method avoids the complexity of the virtual cloud platform and is more in line with the actual construction site management. The protection strategy is dynamically adjusted, including seasonal response. Before the rainy season, the inspection cycle is shortened to once every 3 days based on historical data, and the drainage slope and all sealing points are checked in detail.

[0077] Among them, the physical weather warning terminal is an industrial-grade display device used to display key information, and its core physical structure includes:

[0078] An industrial-grade LED display or touch screen installed in the construction site safety duty room can stably display text and graphic information for a long time.

[0079] The physical weather warning terminal has a dedicated 4G / 5G IoT communication module or a standard wired network interface, which is used only to automatically receive warning information from weather data service providers.

[0080] An embedded microprocessor is responsible for driving the screen and the communicator. Its functions are fixed and do not involve complex software algorithms. It is also equipped with a standard power adapter.

[0081] And the casing that integrates communication modules, network interfaces and processors;

[0082] This terminal transforms the virtual meteorological data stream into a tangible, easily understandable physical display, enabling safety officers to make decisions based on clear information.

[0083] The weather warning response system connects to the local meteorological bureau's real-time API via a data interface. When it receives a warning for heavy rainfall, thunderstorms, or strong winds within the next hour, it issues a temporary reinforcement inspection instruction and reminds safety personnel to tighten the tying devices of the protective canopy 1.

[0084] Specifically, when the physical weather warning terminal receives the heavy rainfall warning information issued by the meteorological bureau, it will display it prominently in the center of the screen. After seeing the warning information, the safety officer will, according to the heavy rainfall response inspection procedure, including notifying the relevant area safety officers through broadcast or walkie-talkie, immediately set up the tie structure (steel wire rope tie) of the protective canopy 1 for fastening.

[0085] The entire process does not rely on electronic sensors or algorithmic decisions, but rather on systems and management processes to achieve rapid response.

[0086] The embodiments of the present invention are also implemented through the following technical solutions.

[0087] In an embodiment of the present invention, the protective shed 1 in step S3 includes a main frame 11, a top plate 12 installed on the top of the main frame 11, a bottom frame 13 installed at the bottom of the main frame 11, and a fire extinguishing mechanism 2 and a sensor 3 installed on the top plate 12. The main frame 11 is composed of several steel pipes spliced ​​together, and the steel pipes are connected by bolts. Its shape is adapted to the shape of the distribution box 4, and a gap for air circulation is maintained between it and the distribution box 4. The gap is usually 0.3-0.7m. L-shaped support rods 14 are bolted between the steel pipes of the main frame 11, and several supports are provided between adjacent steel pipes. The support rod 14 is a horizontal L-shaped support rod. Adjacent support rods 14 are connected by short steel pipe bolts to support the suspended support rods 14 and stabilize the structure of the main frame 11. The bottom frame 13 is composed of several steel pipe bolts connected in a grid pattern to facilitate ventilation at the bottom of the distribution box 4. The distribution box 4 can be placed directly on the bottom frame 13 or a precast concrete block can be set to connect to the bottom frame 13. The three-point leveling method is used again for secondary leveling. The bottom frame 13 is installed on the ground by bolts. The entire structure is connected by bolts for easy turnover and dismantling. Angle irons are set at the corners for reinforcement.

[0088] In an embodiment of the present invention, an extended baffle 15 is provided on each of the four sides of the top plate 12 for guiding rainwater outward. The extended baffle 15 is connected to the top plate 12 by a movable hinge. At least two movable hinges are provided between one extended baffle 15 and the top plate 12. The extended baffle 15 can be adjusted in terms of its opening angle on the four sides of the top plate 12 by the movable hinges to provide rain or sun protection at different angles. Long bolts / screws are provided between the movable hinges on the same side to limit the opening and closing angle of the movable hinges. The extended baffle 15 is designed with a "triangular" cross section. The sloping extended baffle 15 can better provide rain protection.

[0089] In an embodiment of the invention, both the sensor 3 and the fire extinguishing mechanism 2 are bolted to the inner side of the top plate 12, located above the distribution box 4. At least four sensors are installed, distributed at the four corners of the top plate 12, increasing the monitoring and fire extinguishing range. The sensor 3 includes a temperature sensor 3 and a smoke sensor 3, used to monitor the temperature and smoke conditions inside the protective shed 1. The fire extinguishing mechanism 2 includes a feed pipe 21 connected to a fire extinguishing agent storage tank. The fire extinguishing agent storage tank stores dry powder fire extinguishing agent, and the distance between the fire extinguishing agent storage tank and the feed pipe 21 is minimized to reduce the delivery time of the dry powder fire extinguishing agent and reduce fire extinguishing delays. The fire extinguishing agent nozzle 23 sprays dry powder fire extinguishing agent into the distribution box 4. A release pipe 22 is located between the fire extinguishing agent nozzle 23 and the feed pipe 21, allowing... The feed pipe 21 is connected to the extinguishing agent nozzle 23 via the release pipe 22 to deliver dry powder extinguishing agent, and a solenoid valve 24 is installed between the extinguishing agent nozzle 23 and the release pipe 22. The solenoid valve 24 controls the activation of the dry powder extinguishing agent. The feed pipe 21 passes through the top of the main frame 11 and is threaded into the main frame 11. The extinguishing agent nozzle 23 and the solenoid valve 24 are bolted to the top plate 12 via the mounting bracket 26. The mounting bracket 26 stabilizes the position of the extinguishing agent nozzle 23 and the solenoid valve 24. The spray angle of the extinguishing agent nozzle 23 can be adjusted by changing the mounting bracket 26 of different lengths and shapes, so that the extinguishing agent nozzle 23 can be adaptively adjusted according to the height and size of the distribution box 4 to ensure effective fire extinguishing.

[0090] Specifically, the solenoid valve 24 and extinguishing agent nozzle 23 of the fire extinguishing mechanism 2 are selected or designed based on the physical characteristics of dry powder media (such as flowability and particle size). Dry powder extinguishing agents are not easily corroded by valves and pipes, and their delivery has relatively low requirements for pipe pressure resistance. This is highly compatible with the simple and reliable pipe release structure adopted in this solution. If water-based extinguishing agents are used, corrosion-resistant and highly sealing valves and high-pressure resistant pipes are required, and drainage and antifreeze issues need to be considered, which will significantly increase the complexity and cost of the system.

[0091] Furthermore, fires in electrical distribution boxes are usually electrical fires in their early stages. Dry powder extinguishing agents can not only extinguish the flames, but their powder coating on electrical components can also provide good insulation, effectively preventing secondary short circuits or electric shock risks caused by conductive media. This is a safety advantage that water-based extinguishing agents cannot match.

[0092] Therefore, dry powder extinguishing agent is a specific and necessary technical choice made by the hardware system (solenoid valve, nozzle, release pipe) of this solution to achieve rapid, safe and effective fire extinguishing, together forming an optimized electrical fire suppression solution.

[0093] In an embodiment of the present invention, the signal lines of the temperature sensor 3 and the smoke sensor 3 are directly led to a dedicated linkage control box 25. The linkage control box 25 is installed on one side of the solenoid valve 24. The output terminal of the linkage control box 25 is directly connected to the shunt trip coil of the main circuit breaker of the distribution box 4 and the solenoid valve 24. The linkage control box 25 includes a multi-channel relay or multiple independent relays (when the sensor 3 is triggered, the provided signal current flows through the coil of the relay, generating a magnetic field that attracts the internal mechanical switch contacts. The closing or opening of this contact directly controls the power circuit of the fire extinguishing mechanism 2 and the alarm) and auxiliary components, including terminals for neatly and reliably connecting all external wires from the sensor 3, power supply, solenoid valve 24, alarm horn, etc., fuses for providing overcurrent protection to ensure system safety, power modules (providing the required low-voltage DC power to the relay coil and sensor 3; this power supply can be set independently or obtained from the distribution box 4 after transformation), and other basic electrical components.

[0094] When using a multi-channel relay, select a monostable relay with a coil voltage that matches the sensor and power supply, and at least two sets of normally open contacts. The contact capacity must be able to drive the shunt trip unit and the solenoid valve. Connect the alarm output signal lines (both passive normally open contact signals) of the temperature sensor and the smoke sensor in parallel to the coil control terminal of the relay. This parallel logic means that if any sensor alarms, it will supply power to the relay coil, causing it to operate. The first set of normally open contacts is used to control the shunt trip unit of the main circuit breaker in the distribution box, and the second set of normally open contacts is used to control the solenoid valve of the fire extinguishing mechanism. Optionally, a third set of normally open contacts can be used to connect the audible and visual alarm to realize the alarm function.

[0095] When using multiple independent relays, such as two independent relays, the coils of the two relays can be connected to their respective sensors, and their normally open contacts can be connected in parallel to control the subsequent circuits. In this way, when any relay is activated, its closed contacts can connect the circuits of the shunt trip unit and the solenoid valve. Under normal conditions (no alarm), the temperature / smoke sensor is in monitoring mode, its alarm output contact (normally open) is open, the relay coil is not energized, all normally open contacts are in the open state, and the circuits of the shunt trip unit, solenoid valve, and alarm are all open, so the system does not operate. When an alarm is triggered, if the temperature sensor detects that the temperature exceeds a preset threshold (e.g., 70℃) or the smoke sensor detects that the smoke concentration exceeds a preset threshold (e.g., 5% obs / m³), the internal relay of the corresponding sensor will activate, and its normally open alarm contact will close. Since the sensor signal lines are connected in parallel, this closing signal immediately powers the relay coil. The relay coil is energized, generates a magnetic field, and attracts all its internal normally open contacts, making them close. After the fire is dealt with, a manual reset is required. First, troubleshoot the problem, then de-energize and re-energize the sensor and relay to restore them to normal operation. The shunt trip unit also needs to be manually closed.

[0096] Specifically, the core component of the linkage control box 25 is a relay. The normally open signal output lines of the temperature sensor 3 and the smoke sensor 3 are connected in parallel and then connected to the control coil port of the relay. When either sensor 3 detects an abnormality (such as a sudden rise in temperature or excessive smoke concentration), its output signal will trigger the relay coil to be energized, causing its normally open contacts to close. This closing action will directly complete the connection of the two circuits.

[0097] A circuit is connected, which controls the shunt trip unit of the main power circuit breaker in the distribution box 4 to quickly cut off the main power supply.

[0098] At the same time, another circuit is connected, which powers the solenoid valve 24 and the audible and visual alarm of the fire extinguishing mechanism 2, driving them to start immediately, release the extinguishing agent and sound an alarm;

[0099] At the same time, another circuit is connected, which is the delivery pump at the fire extinguishing agent storage tank. It drives the pump to deliver the dry powder fire extinguishing agent to the feed pipe 21, and through the release pipe 22 and the solenoid valve 24, it is sprayed from the fire extinguishing agent nozzle 23 to the distribution box 4.

[0100] The entire linkage process is based on hard-wired electrical connections, eliminating the need for data transfer and processing, resulting in rapid response and high reliability.

[0101] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0102] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to a specific order or hierarchy.

[0103] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0104] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

[0105] The steps of the methods or algorithms described in conjunction with the embodiments herein can be directly embodied in hardware, software modules executed by a processor, or a combination thereof. The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user terminal. Alternatively, the processor and storage medium can exist as discrete components in the user terminal.

[0106] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. This software code can be stored in memory units and executed by a processor. The memory units can be implemented within the processor or outside the processor; in the latter case, they are communicatively coupled to the processor via various means, as is well known in the art.

[0107] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A method for protecting electrical distribution boxes at construction sites, characterized in that, Includes the following steps: S1. Before installing the distribution box (4) and the distribution box protective shed (1), collect and record the multi-dimensional environmental parameters of the construction area, assess the risk index, and plan the installation point of the distribution box (4). S2, based on the risk index obtained from S1, selects and executes an adaptation plan from historical projects; S3, a protective canopy (1) with integrated sensors (3) and fire extinguishing mechanism (2) is set outside the distribution box (4) installation point. S4. Subsequently, the distribution box (4) was installed inside the installed protective shed (1) using the three-point leveling method. After leveling, elastic sealant was immediately filled into the gap between the box and the ground to form the first buffer and sealing layer. The cable passage hole was treated by the layered sealing method from the inside to the outside. S5 uses a dual-track inspection mechanism to conduct inspections and adjusts protection strategies based on inspection results and external data input.

2. The method for protecting a distribution box at a construction site according to claim 1, characterized in that, The multi-dimensional environmental parameters in step S1 include: the terrain elevation of the installation point and drainage conditions; The main types of operations and their risk levels within a 50-meter radius; And to obtain historical meteorological data for the region.

3. A method for protecting a distribution box at a construction site according to claim 2, characterized in that, The risk index in step S1 is generated by the on-site safety officer matching the current environmental parameters with historical project files and directly referencing the verified project data in the historical scenario as the current risk index. The risk index includes at least waterproof rating, impact resistance rating, and fire resistance rating.

4. A method for protecting a distribution box at a construction site according to claim 1, characterized in that, The protective shed (1) in step S3 includes a main frame (11), a top plate (12) installed on the top of the main frame (11), a bottom frame (13) installed at the bottom of the main frame (11), and a fire extinguishing mechanism (2) and a sensor (3) installed on the top plate (12). The main frame (11) is spliced ​​from several steel pipes. Its shape is adapted to the shape of the distribution box (4) and maintains a gap for air circulation between it and the distribution box (4). L-shaped support rods (14) are bolted between the steel pipes of the main frame (11). The support rods (14) are connected to each other by short steel pipe bolts. The bottom frame (13) is composed of several steel pipe bolts connected in a grid shape. The bottom frame (13) is installed on the ground by bolts.

5. A method for protecting a distribution box at a construction site according to claim 4, characterized in that, The top plate (12) is provided with an extension baffle (15) on all four sides. The extension baffle (15) is connected to the top plate (12) by a movable hinge. At least two movable hinges are provided between one extension baffle (15) and the top plate (12). Long bolts / screws are provided between the movable hinges on the same side. The cross section of the extension baffle (15) is a "triangular" design.

6. A method for protecting a distribution box at a construction site according to claim 5, characterized in that, The sensor (3) and the fire extinguishing mechanism (2) are both bolted to the inside of the top plate (12) and located above the power distribution box (4). The sensor (3) includes a temperature sensor (3) and a smoke sensor (3). The fire extinguishing mechanism (2) includes a feed pipe (21) connected to the fire extinguishing agent storage tank, a fire extinguishing agent nozzle (23), a release pipe (22) located between the fire extinguishing agent nozzle (23) and the feed pipe (21), and a solenoid valve (24) located between the fire extinguishing agent nozzle (23) and the release pipe (22). The feed pipe (21) passes through the top of the main frame (11) and is threaded to the main frame (11). The fire extinguishing agent nozzle (23) and the solenoid valve (24) are bolted to the top plate (12) through a mounting bracket (26).

7. A method for protecting a distribution box at a construction site according to claim 6, characterized in that, The signal lines of the temperature sensor (3) and the smoke sensor (3) are directly led to a dedicated linkage control box (25). The linkage control box (25) is installed on one side of the solenoid valve (24). The output end of the linkage control box (25) is directly connected to the shunt trip coil of the main circuit breaker of the distribution box (4) and the solenoid valve (24). The linkage control box (25) includes a multi-channel relay or multiple independent relays and auxiliary components.

8. A method for protecting a power distribution box at a construction site according to claim 1 or 4, characterized in that, The process of sealing the cable passage hole in step S4 is as follows: S41, first apply long-lasting waterproof adhesive evenly to the inner wall of the wire hole; S42, then select the matching rubber sheath or threaded sealing connector according to the cable diameter for installation; S43. Finally, insulating putty is used to wrap and shape the outside of the interface to prevent rainwater from flowing back along the cable.

9. A method for protecting a distribution box at a construction site according to claim 1, characterized in that, The dual-track inspection mechanism in step S5 specifically includes: Routine inspections are conducted every 7 days, with a focus on checking whether the sealant has aged and cracked, whether the protective canopy (1) is structurally stable, and whether the sensor (3) functions properly. Event-driven inspections require a special inspection to be conducted within 24 hours of the completion of pre-set high-risk operations (such as foundation pit excavation, concrete pouring, steel structure hoisting, and large-scale demolition) to focus on assessing whether the enclosure has structural deformation or sealing damage.

10. A method for protecting a power distribution box at a construction site according to claim 9, characterized in that, The external data input in step S5 is achieved by setting up a physical weather warning terminal in the safety duty room at the construction site. The terminal is directly connected to the data interface of the local meteorological bureau through a wired network to receive and display the weather forecast and disaster warning for the next 1-6 hours in real time. The safety officer manually initiates a temporary reinforcement inspection command based on the warning level displayed on the terminal and notifies relevant personnel to tighten the protective shed (1).

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