SAP stacked mass spray fireproofing encapsulation system with built-in horizontal components and its implementation method

Abstract

This invention discloses an SAP (Super Plumbing Agent) stack spray fireproofing and sealing system with built-in horizontal components and its implementation method. The system includes distributed intelligent fireproofing units, a closed-loop pressurized fluid distribution network, and a water-absorbing and sealing unit. Unit collaboration is achieved through a wireless mesh network, intelligently triggering three-level spray modes—high spray volume, low spray volume, and asymmetric compensation—based on temperature / strain gradients to precisely suppress thermal warping deformation and provide full-coverage, adaptive dynamic fireproof protection for the horizontal components.

Description

Technical Field

[0001] This invention relates to the field of fire protection for large-span spatial structures, specifically to an SAP stacked body spray fireproofing encapsulation system with built-in horizontal components and its implementation method. Background Technology

[0002] Large-span spatial structures are a reflection of the level of infrastructure construction. They have been developed and widely used in recent years and are commonly found in large public buildings such as stadiums, railway stations, and airport terminals.

[0003] In large-span spatial structural systems, grid shell structures are widely used due to their advantages such as light weight, large span, and flexible design. These grid shell structures are mainly constructed using two materials: lightweight steel and aluminum alloy, each with its own characteristics.

[0004] Light steel structure: It has the advantages of high strength, good toughness and high degree of industrialization, and is the traditional mainstream material for large-span spatial structures.

[0005] Aluminum alloy structures: Compared to steel, aluminum alloys have outstanding advantages such as light weight, corrosion resistance, ease of processing and forming, and aesthetic appeal, and are increasingly used in large-span buildings. Aluminum alloy grid shells typically adopt a single-layer grid shell system with plate nodes. Their design process is similar to that of ordinary steel grid shells, and they can be constructed using various flexible methods such as high-altitude assembly, hoisting, and sliding.

[0006] Both light steel and aluminum alloy grid shell structures are critical load-bearing components in large-span spatial buildings, and their safety directly determines the stability of the overall structure under extreme conditions. Although light steel and aluminum alloy each have their advantages as structural materials, they share a common fatal weakness—poor fire resistance. Fire poses a serious threat to both materials, mainly in the following aspects:

[0007] Light steel structure: Although steel is non-combustible, it has a high thermal conductivity, and its strength drops sharply under the high temperatures of a fire. Typically, the yield strength of ordinary structural steel at 550℃ will drop to about 60% of that at room temperature, leading to a significant decrease in the structural load-bearing capacity and ultimately causing overall collapse.

[0008] Aluminum alloy structures: Aluminum alloys not only have a low melting point (approximately 660℃), but their thermal conductivity is also about three times that of steel. This makes aluminum alloy structures heat up faster in a fire and more prone to losing their load-bearing capacity. Studies have shown that aluminum alloy materials can lose more than 50% of their strength at temperatures above 300℃, and they also deform severely after being heated.

[0009] Large-span buildings typically feature high ceilings and good air circulation, making their fire development significantly different from that of typical buildings. The temperature rise process in these spaces differs from that of small-room fires; flames and high-temperature smoke are more likely to accumulate and spread rapidly beneath the ceiling, causing widespread heat radiation to the roof grid structure and accelerating structural failure. Given the serious threat posed by fire to lightweight steel and aluminum alloy grid structures, conducting targeted fire prevention research has become a crucial and urgent task.

[0010] The main technological bottlenecks are as follows:

[0011] Firstly, although existing fireproofing measures for steel structures and aluminum alloys (such as coatings and cladding) are widely used in conventional components, their technical characteristics are insufficient to meet the stringent requirements of modern large-scale spatial structure shells. The main problem is:

[0012] 1. Durability and maintenance challenges: Fire-retardant coatings applied on-site are prone to aging and peeling, and their durability is difficult to guarantee in the complex nodes of the mesh shell and the high-altitude environment, resulting in high maintenance costs in the later stages.

[0013] 2. Space and shape limitations: Using concrete cladding or fireproof board wrapping will significantly increase the cross-section of the grid shell, encroach on the effective building space, and completely change the mechanical shape and architectural aesthetic expression of the grid shell.

[0014] 3. Insufficient flexibility and adaptability: Existing methods are mostly "passive wrapping", which makes it difficult to flexibly adapt to the different shapes and sizes of large spatial structure shells while ensuring fire resistance performance, resulting in poor installation convenience.

[0015] The deficiencies of existing fire prevention measures are shown in the table below:

[0016] Fire prevention measures defect Fire-retardant spraying material - The coating has low strength and is easily damaged by impacts. - Its durability (such as weather resistance) is relatively poor, requiring maintenance. - It is suitable for concealed areas or areas where aesthetics are not a primary concern. Fireproof board - For non-standard or complex-shaped components, processing and installation are more complicated. - It will occupy a certain amount of building space. Outer concrete / mortar - Heavy weight significantly increases structural load. - Wet construction methods result in long construction periods and harsh environments. - The largest increase in cross-sectional dimensions.

[0017] Secondly, existing SAP fireproofing technology is insufficient to meet the special protection requirements of large-span horizontal structural members. SAP (superabsorbent polymer) materials, due to their excellent water absorption and retention properties, can form a fireproof system with evaporative heat absorption potential when combined with water. Currently, this technical approach has been explored in vertical structural members such as cold-formed steel walls and box-type frames, with the common implementation method being the static filling of the member's cavity with SAP deposits. However, directly applying this approach to horizontal structural members (such as space frames, trusses, and beams) in large-span spatial structures presents more complex and unique problems determined by their own structural characteristics and stress states: the material distribution and coverage under gravity is more challenging; the bottom surface of the inner cavity of horizontal structural members is a natural settlement plane. Under long-term gravity, SAP deposits are more likely to form a hardened accumulation layer on the bottom surface, while critical fire-affected areas such as the top and sides of the structural members become permanent protection blind spots. This uneven distribution of thickness at the bottom and thinner top means that when horizontal components are exposed to fire, the top steel or aluminum structure may overheat and fail rapidly due to lack of effective cooling, posing a far greater risk than potential localized weaknesses at the top of vertical components. Maintaining and precisely replenishing moisture in long-span structures faces challenges: long-span horizontal components are often tens of meters long, and their cavities are not completely sealed, allowing internal moisture to evaporate in a gradient along the length of the component. For a one-time static filling solution, moisture loss will lead to irreversible degradation of fire resistance. More importantly, current technology cannot sense the moisture content of different areas within such long components and replenish water as needed, resulting in unreliable protective performance both spatially and temporally. Existing static solutions cannot respond to the thermodynamic behavior of horizontal components: during a fire, horizontal components experience significant thermal warping (i.e., the component arches upwards) due to uneven heating of the upper and lower surfaces. Existing static SAP solutions are completely ineffective in addressing this. It cannot balance the cross-sectional temperature difference by dynamically adjusting the cooling distribution, nor can it actively suppress the resulting harmful deformation through directional hydraulic intervention, which seriously threatens the stability of the structure in a fire.

[0018] Therefore, existing SAP fire protection approaches, on the one hand, cannot establish a stable, fully covered fire protection system within horizontal components due to uneven gravity distribution and ineffective moisture replenishment; on the other hand, their static, indiscriminate operation mode is severely out of sync with the dynamic and non-uniform thermodynamic response of large-span horizontal components under real fire conditions. Current technology cannot provide reliable fire protection solutions for horizontal load-bearing components that are crucial to the overall safety of large-span spatial structures.

[0019] To address the aforementioned issues, there is an urgent need to develop a novel fire-resistant structure for the horizontal components of large-span spatial structures that combines full coverage, high durability, no alteration to the structural appearance, and sustainable fire protection. Summary of the Invention

[0020] To overcome the above-mentioned shortcomings of the prior art, the present invention provides an SAP stacked body spray fireproof encapsulation system with built-in horizontal components and its implementation method. The present invention achieves unit collaboration through a wireless mesh network, and intelligently triggers three-level spray modes of large spray volume, small spray volume and asymmetric compensation according to temperature / strain gradient, accurately suppressing thermal warping deformation, and providing full-coverage, adaptive dynamic fireproof protection for the horizontal components.

[0021] The technical solution adopted by this invention to solve its technical problem is:

[0022] A SAP (Super Absorbent Polymer) stack spray fireproofing encapsulation system with an integrated horizontal component includes: a pressurized fluid distribution network, a water-absorbing and sealing unit, and multiple intelligent fireproofing units distributed at key locations on the horizontal component; each intelligent fireproofing unit integrates a local processor, a temperature sensor array, a strain sensor array, and an independently controlled spray module; the pressurized fluid distribution network connects each spray module and is integrated into the internal cavity of the horizontal component; the water-absorbing and sealing unit is fully fixed to the inner wall of the horizontal component to support and seal highly absorbent resin particles; each local processor is interconnected via a wireless mesh network and establishes a collaborative control mechanism; the system is configured to execute a graded spray control strategy, including:

[0023] When the temperature monitored by any temperature sensor array is greater than the first temperature threshold, the high-volume injection mode is activated.

[0024] When the temperature monitored by the temperature sensor array is less than or equal to the first temperature threshold and the strain gradient monitored by the strain sensor array is less than or equal to the strain gradient threshold, the small injection volume mode is activated.

[0025] When the temperature gradient monitored by the temperature sensor array is greater than the second temperature threshold and less than or equal to the first temperature threshold, or when the strain gradient monitored by the strain sensor array is greater than the strain gradient threshold, the asymmetric compensation injection mode is activated.

[0026] Preferably, in the high-volume spray mode, the nozzle water pressure of the spray module is 2.5-3.0 MPa, the cross-sectional spray coverage angle is 130°-140°, and the duration is 25-30 seconds; in the low-volume spray mode, the nozzle water pressure of the spray module is 0.2-0.3 MPa, the cross-sectional spray coverage angle is 90°-100°, and it operates in a periodic pulse mode.

[0027] Preferably, the asymmetric compensation spray mode forms a lateral pressure difference of 0.3-0.6 MPa by independently adjusting the operating parameters of the spray modules facing the high-temperature side and the low-temperature side of the component, so as to suppress thermally induced flexural deformation.

[0028] Preferably, the pressurized fluid distribution network is a closed-loop pressurization design, with its network terminals sealed by pipe plugs and an automatic exhaust valve installed at the highest point of the network. The pressurized fluid distribution network is composed of multiple network units connected by a central hydraulic flow control connector; the central hydraulic flow control connector has a spherical cavity inside, the volume of which is configured to be 15%-20% of the total flow of a single network unit to form a hydraulic buffer zone.

[0029] Preferably, the water-absorbing and sealing unit includes a layered honeycomb structure and highly absorbent resin particles filled in its honeycomb cavities; the filling volume of the highly absorbent resin particles accounts for 1 / 4 to 1 / 2 of the volume of a single honeycomb cavity, and a dense cured layer is formed on the cavity surface by water absorption and gelation.

[0030] Preferably, the strain sensor array uses high-temperature resistant fiber optic strain sensors, which are deployed at the critical control sections of the component.

[0031] Preferably, the first temperature threshold is 140℃~160℃, the second temperature threshold is 100℃ / m, and the strain gradient threshold is 50με / mm.

[0032] The present invention also provides a method for implementing the above system, comprising the following steps:

[0033] The temperature and strain fields of horizontal components are monitored in real time through distributed intelligent fire protection units.

[0034] Based on monitoring data, determine whether the component is in a state of uniform thermal expansion or non-uniform thermal flexural deformation.

[0035] Based on the judgment result, the corresponding graded injection control strategy is intelligently selected and triggered through the collaborative control mechanism.

[0036] The wireless mesh network coordinates the execution of the triggered spraying strategies by each intelligent fire protection unit. Beneficial effects

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. This invention eliminates the risks of SAP flowability and gravity settling by sealing SAP particles in a fully fixed layered honeycomb structure with a precise filling amount (1 / 4 to 1 / 2), ensuring that all inner wall surfaces of horizontal components (including the critical top and side surfaces) are free of weak points and provide high stability all-round protection.

[0039] 2. This invention uses distributed intelligent fire prevention units to sense the water content of different areas in real time (indirectly reflected by the temperature field and SAP heat absorption efficiency), and the built-in sprinkler unit executes the "small spray volume maintenance" and "large spray volume compensation" strategies to achieve directional and on-demand water replenishment for components spanning tens of meters, forming a dynamic and sustainable fire prevention cycle of "water fixation - evaporation heat absorption - intelligent replenishment - re-fixation", ensuring the long-term reliability and effectiveness of the system.

[0040] 3. This invention introduces an asymmetric compensation spraying mode based on dual threshold judgment (temperature gradient and strain gradient). The system can actively identify structural deflection trends caused by uneven heating and, through differential adjustment of spray pressure, introduce reverse thermal stress inside the component to actively suppress heat-induced deflection deformation. This completely changes the traditional static fire protection mode, providing unprecedented structural safety protection for horizontal components.

[0041] 4. This invention achieves precise allocation of fire-fighting and cooling resources through a three-tiered strategy of "high-volume spray," "low-volume spray," and "compensation spray." This ensures rapid response capabilities in the early stages of a fire while significantly reducing water and energy consumption through a low-power maintenance mode. This intelligent resource management strategy makes the system particularly suitable for large-scale engineering projects with scarce water resources or those sensitive to operating costs, demonstrating outstanding engineering application value. Attached Figure Description

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Figure 1 This is a schematic diagram of the overall structure of the horizontal component of the large-span spatial structure provided in an embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of the network unit structure of the horizontal component of the large-span spatial structure provided in an embodiment of the present invention.

[0045] Figure 3 This is a schematic diagram of the network unit structure of the fluid distribution network provided in an embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the structure of the omnidirectional atomizing spray unit provided in an embodiment of the present invention.

[0047] Figure 5 A schematic diagram of the structure of the central hydraulic flow control connector of the network unit provided in an embodiment of the present invention.

[0048] Figure 6 for Figure 5 Sectional view along line A.

[0049] In the picture:

[0050] 1. Horizontal component; 2. Water absorption and sealing unit; 3. Built-in spray unit; 11. Bottom surface of horizontal component; 21. Honeycomb structure; 22. Highly absorbent resin particles; 31. Fluid distribution network; 32. All-around atomizing spray unit; 33. Hydraulic flow control connector at the center of the network unit; 311. Fluid distribution network unit; 312. Pipe plug; 321. Single spray holder; 322. Atomizing nozzle; 323. Fan-shaped nozzle. Detailed Implementation

[0051] 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, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0052] Example 1: This example uses a 45-meter span grid structure of a sports stadium as the application object to provide a specific implementation method of an SAP stacked body spray fireproof sealing system with built-in horizontal components.

[0053] The superabsorbent polymer in this embodiment is referred to as SAP.

[0054] like Figures 1-6 As shown, this embodiment provides a SAP stack spray fireproofing encapsulation system with an integrated horizontal component, comprising a pressurized fluid distribution network, a water-absorbing sealing unit 2, and multiple intelligent fireproofing units distributed at key locations of the horizontal component 1. Each intelligent fireproofing unit integrates a local processor, a temperature sensor array, a strain sensor array, and an independently controlled spray module. The pressurized fluid distribution network connects each spray module and is integrated into the internal cavity of the horizontal component 1. The water-absorbing sealing unit 2 is fully fixed to the inner wall of the horizontal component 1 to support and seal the highly absorbent resin. Each local processor is interconnected via a wireless mesh network to establish a collaborative control mechanism and communicate with a remote control platform. The system is configured to execute a graded spray control strategy.

[0055] The key parts include, but are not limited to, the mid-span area, the support area, and the main compression members, which are crucial to the overall stability of the structure.

[0056] In this embodiment, a calculation model is established using finite element analysis software for the 45-meter span sports stadium space frame structure. By simulating the stress state of the structure under standard load conditions and combining it with the ISO-834 standard fire temperature rise curve for thermo-mechanical coupling analysis, the component sections with the maximum internal forces (axial force, bending moment) or the lowest stability coefficient under fire conditions are identified. In this embodiment, the key parts refer to the lower chord at mid-span, the web members near the supports, and some upper chords identified through the above analysis. The intelligent fire protection unit of this system is preferentially installed in these key parts.

[0057] In this embodiment, the spray module and the pressurized fluid distribution network together form the built-in spray unit 3.

[0058] The water-absorbing and sealing unit 2 includes a layered honeycomb structure 21 and highly absorbent resin particles 22 filled within its honeycomb cavities. The honeycomb structure 21 is a layered structure made of aramid paper honeycomb, with a honeycomb pore size of 20 mm, a wall thickness of 0.2 mm, and a layer thickness of 10 mm. This material maintains stable physicochemical properties even at 220°C. The highly absorbent resin particles 22 are heat-resistant sodium polyacrylate (SAP), with a particle size controlled between 80-120 mesh, and their filling volume within the honeycomb cavities accounts for 1 / 3 of the volume of a single honeycomb cavity. The water-absorbing and sealing unit 2 is fully fixed to the inner wall of the horizontal member 1 using large-headed screws at 200 mm intervals.

[0059] The built-in spray unit 3 includes a fluid distribution network 31, i.e., a pressurized fluid distribution network, and an omnidirectional atomizing spray unit 32, i.e., a spray module, installed on the fluid distribution network 31.

[0060] In this embodiment, the horizontal component has a box-shaped cross-section, so the fluid distribution network 31 is arranged along the center line of the bottom surface 11 of the horizontal component.

[0061] The fluid distribution network 31 is formed by connecting multiple fluid distribution network units 311 through a central hydraulic flow control connector 33. Its terminal is sealed with a pipe plug 312. The volume of the spherical cavity inside the central hydraulic flow control connector 33 is designed to be 18% of the total flow of a single network unit, forming an effective hydraulic buffer zone.

[0062] The omnidirectional atomizing spray unit 32 uses a single spray base 321 to install an atomizing nozzle 322. The atomizing nozzle 322 uses a fan-shaped nozzle 323, and the spray direction is at a 90° elevation angle relative to the bottom surface.

[0063] The temperature sensor array is arranged at key cross-sections of the component, including measuring points on the bottom, sides, and top. The strain sensor array employs high-temperature resistant fiber optic strain sensors, specifically FBG fiber grating sensors, deployed at key control sections of the component to monitor the strain gradient distribution of the component cross-section in real time. The local processor is configured to execute local control strategies, while the collaborative control mechanism coordinates the decisions of multiple intelligent fire protection units through a wireless mesh network.

[0064] The built-in spray unit 3, spray control module, single spray base 321, atomizing nozzle 322, fan-shaped nozzle 323, fluid distribution network unit 311, network unit central hydraulic flow control connector 33, pipe plug 312, local processor, temperature sensor array, strain sensor array, and remote control platform in this embodiment all adopt existing products or structures well known to those skilled in the art, and the connection or control methods between them also adopt existing connection or control methods well known to those skilled in the art.

[0065] Each atomizing nozzle 322 in this embodiment is equipped with a high-temperature resistant electric pressure regulating valve, which is well known to those skilled in the art. The selection of the high-temperature resistant electric pressure regulating valve must meet the fire resistance requirement of continuous operation at an ambient temperature of 250°C for no less than 60 minutes. The temperature measurement range of the temperature sensor array should cover 0°C to 600°C, and the measurement accuracy should be no less than ±2%.

[0066] The system of this embodiment shall be installed in accordance with the above requirements, specifically including the following steps:

[0067] S1. Installation of the water absorption and sealing unit:

[0068] The honeycomb structure 21 is cut and matched, and superabsorbent resin particles 22 are filled into it to 1 / 3 of its cavity volume. After gelation treatment, it is fixed to the inner wall of the component. Using a handheld low-pressure sprayer well known to those skilled in the art, deionized water is used as the medium to spray evenly perpendicularly to the surface of the honeycomb structure 21. The spraying amount is controlled to increase the total weight of the superabsorbent resin particles 22 by 5%-8%. After spraying, it is left to stand and cure for 15 minutes in an environment with a temperature of 20±5℃ and a humidity of 50%±10%. At this time, a slightly cross-linked gel layer is formed on the surface of the superabsorbent resin particles 22, which has an adhesive force between itself and between itself and the honeycomb wall, but does not completely block the air permeability and water storage space of the honeycomb cavity. Only after this treatment can the unit be installed and fixed.

[0069] S2, Built-in sprinkler unit installation:

[0070] Arrange the fluid distribution network 31 according to the design requirements, ensuring that all terminals are sealed with pipe plugs 312; install atomizing nozzles 322 and adjust them to a 90° elevation angle.

[0071] S3, Intelligent Fire Protection Unit Installation:

[0072] Arrange temperature sensor arrays and strain sensor arrays, connect them to the local processor, and establish a wireless mesh network.

[0073] S4. System Integration and Debugging:

[0074] After completing all connections, system debugging was performed to test the pressurization effect and collaborative control logic of the pressurized fluid distribution network.

[0075] The system operation method and specific control strategies in this embodiment include:

[0076] Data acquisition: Temperature and strain data are acquired at a frequency of 10 times per second;

[0077] Status judgment:

[0078] When the temperature monitored by any temperature sensor array is greater than 150°C, the high-volume injection mode is activated.

[0079] When the temperature monitored by the temperature sensor array is less than or equal to 150℃ and the strain gradient monitored by the strain sensor array is less than or equal to 50με / mm, the small injection volume mode is activated.

[0080] When the temperature gradient monitored by the temperature sensor array is greater than 100℃ / m and less than or equal to 150℃, or the strain gradient monitored by the strain sensor array is greater than 50με / mm, the asymmetric compensation injection mode is activated.

[0081] Injection control:

[0082] High spray volume mode: water pressure 2.8MPa, coverage angle 135°, lasting 28 seconds;

[0083] Small spray mode: water pressure 0.25MPa, coverage angle 95°, operating in a periodic pulse mode with a spray time of 5 seconds and an interval of 15 seconds;

[0084] Asymmetric compensation mode: The spatial distribution data of the temperature sensor array within the unit is retrieved by the local processor to calculate the average temperature of four regions on the bottom, left, right, and top surfaces of the component cross-section. The region with the highest average temperature for two consecutive sampling cycles is identified as the main fire-receiving surface. Based on the orientation of the main fire-receiving surface, target pressures are set for nozzles at different locations within the unit according to a preset pressure mapping relationship in the local processor. The pressure mapping relationship is established based on the principle of "strengthening cooling of the fire-receiving surface and weakening cooling of the unfired surface to balance the cross-sectional temperature difference," as shown in the table below.

[0085]

[0086] This pressure configuration is designed to create a water curtain with high cooling intensity on the fire-exposed side, while reducing the cooling intensity on the unfired side, thereby reducing the temperature gradient within the component's cross-section and suppressing thermal bending deformation caused by uneven heating at its source.

[0087] The local processor sends control signals to the high-temperature electric pressure regulating valves corresponding to each nozzle through a PID control algorithm, dynamically adjusting their opening. The PID control takes the deviation between the measured value of the nozzle outlet pressure and the target value as input, and its control objective is to stabilize the pressure within ±5% of the target value within 2 seconds; thereby forming an enhanced cooling water curtain pointing towards the fire-receiving surface, realizing active compensation for uneven heating of the structure.

[0088] In this way, a reinforced, directional cooling water curtain is formed inside the component. The cooling intensity of this water curtain is asymmetrically directed towards the fire-exposed surface, thereby actively counteracting the structural thermal stress and deformation caused by uneven heating.

[0089] The fluid distribution network 31 in this embodiment adopts a closed design, with the terminal closed and an automatic air release valve installed at the highest point. When the pressure exceeds 4MPa, it automatically releases pressure. The automatic air release valve in this embodiment adopts existing products or structures known to those skilled in the art, and its connection with the fluid distribution network 31 also adopts existing connection methods known to those skilled in the art.

[0090] The wireless mesh network adopts a star-mesh hybrid topology, and the network can self-heal within 100ms when any node fails, ensuring reliable transmission of control commands.

[0091] Each intelligent fire protection unit independently and in parallel executes the aforementioned graded spray control strategy based on data from its own temperature sensor array and strain sensor array.

[0092] The implementation of the cooperative control mechanism relies on the "neighbor relationship" established during the system initialization phase; the process for establishing this relationship is as follows:

[0093] Neighbor Discovery: After the system is installed and powered on, the wireless mesh network automatically establishes a physical connection. Subsequently, the local processor of each smart fire unit executes a network-wide neighbor discovery protocol. This protocol requires each unit to broadcast a "greeting" packet containing its own unique ID at a specific power level and listen for "greeting" packets from other units.

[0094] List Construction: Each local processor records other units that can reliably receive its "greeting" packet and successfully reply with an acknowledgment signal in its internal static neighbor list. This list is persisted after initialization and will not change unless the system topology undergoes a physical change and is reinitialized.

[0095] Neighbor definition: In this embodiment, the "neighbor unit" specifically refers to all other units recorded in the static neighbor list of any intelligent fire protection unit. This relationship ensures the determinism and predictability of the scope of cooperation.

[0096] The collaborative fire alarm response logic is as follows:

[0097] When any intelligent fire prevention unit (referred to as an "alarm unit") determines that it meets the conditions for triggering the high-fire mode (i.e., the temperature monitored by any temperature sensor array is greater than 150°C), it will immediately broadcast a data frame containing the "fire alarm" level at the highest priority through the wireless Mesh network while entering the high-volume spray mode. This frame contains its own unit ID.

[0098] Upon receiving this "fire alarm" broadcast, all neighboring units whose static neighbor list contains the alarm unit ID do not unconditionally enter fire mode simultaneously. Instead, they initiate the following collaborative decision-making logic:

[0099] The neighboring unit immediately checks its own T_max, which is the maximum value of all temperature sensor readings within the same sampling period on the cross-section of the component it is monitoring.

[0100] If its own T_max ≥ 120℃: This indicates that the fire may have spread to the area. The neighboring unit immediately enters the high-volume spray mode to form a "regional joint defense" to surround and suppress the fire.

[0101] If its own T_max < 120℃: This indicates that the unit is on the edge of a fire or is only affected by heat radiation. The unit then enters a "high alert" state. In this state, its local control strategy priority remains unchanged (it may still be in low spray volume or asymmetric mode), but the data sampling frequency will be increased to 20 times / second, and the network status will be continuously monitored to prepare for the fastest possible response to possible fire spread.

[0102] In this embodiment, the other structures of the horizontal component 1 of the large-span spatial structure adopt existing fireproof structures that are well known to those skilled in the art.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A built-in horizontal member SAP accumulation body spray fireproof packaging system applied to the field of fireproofing of large-span space structures, characterized in that, The system comprises: a pressurized fluid distribution network, a water-absorbing and sealing unit, and a plurality of intelligent fireproof units distributed at key positions of the horizontal member; each intelligent fireproof unit is integrated with a local processor, a temperature sensor array, a strain sensor array, and an independently controlled spray module; the pressurized fluid distribution network connects the spray modules and is integrated in the internal cavity of the horizontal member; the water-absorbing and sealing unit is fixed on the inner wall of the horizontal member to carry and seal superabsorbent resin particles; the local processors are interconnected through a wireless Mesh network and a cooperative control mechanism is constructed; the system is configured to execute a hierarchical spray control strategy, comprising: when the temperature monitored by any temperature sensor array is greater than a first temperature threshold, a large-volume spray mode is started; when the temperatures monitored by the temperature sensor arrays are all less than or equal to the first temperature threshold and the strain gradient monitored by the strain sensor array is less than or equal to a strain gradient threshold, a small-volume spray mode is started; when the temperature gradient monitored by the temperature sensor array is greater than a second temperature threshold and less than or equal to the first temperature threshold or the strain gradient monitored by the strain sensor array is greater than the strain gradient threshold, an asymmetric compensation spray mode is started; the pressurized fluid distribution network is a closed pressurized design, the network terminal is closed with a pipe plug, and an automatic exhaust valve is arranged at the highest point of the network; the pressurized fluid distribution network is connected by a plurality of network units through a central hydraulic flow control joint; the central hydraulic flow control joint is internally provided with a spherical cavity, the volume of which is configured to be 15%-20% of the total flow of a single network unit to form a hydraulic buffer zone.

2. The SAP accumulation body spray fireproof packaging system with built-in horizontal member according to claim 1, characterized in that, In the large-volume spray mode, the nozzle water pressure of the spray module is 2.5-3.0 MPa, the cross-sectional spray coverage angle is 130°-140°, and the duration is 25-30 seconds; in the small-volume spray mode, the nozzle water pressure of the spray module is 0.2-0.3 MPa, the cross-sectional spray coverage angle is 90°-100°, and the spray module operates in a periodic pulse mode.

3. The SAP accumulation body spray fireproof packaging system with built-in horizontal member according to claim 1, characterized in that, In the asymmetric compensation spray mode, the working parameters of the spray modules facing the high-temperature side and the low-temperature side of the member are independently adjusted to form a lateral pressure difference of 0.3-0.6 MPa to suppress thermal deflection deformation.

4. The SAP accumulation body spray fireproof packaging system with built-in horizontal member according to claim 1, characterized in that, The water-absorbing and sealing unit comprises a sheet-like honeycomb structure and the superabsorbent resin particles filled in the honeycomb cavities; the filling volume of the superabsorbent resin particles accounts for 1 / 4 to 1 / 2 of the volume of a single honeycomb cavity, and the superabsorbent resin particles are gelatinized by absorbing water to form a dense solidified layer on the surface of the cavity.

5. The SAP accumulation body spray fireproof packaging system with built-in horizontal member according to claim 1, characterized in that, The strain sensor array adopts high-temperature resistant optical fiber strain sensors and is arranged at the key control section of the member.

6. The SAP accumulation body spray fireproof packaging system with built-in horizontal member according to claim 1, characterized in that, The first temperature threshold is 140℃-160℃, the second temperature threshold is 100℃ / m, and the strain gradient threshold is 50με / mm.

7. A method for implementing the SAP accumulation body spray fireproof packaging system with built-in horizontal components according to any one of claims 1-6, characterized in that, The method comprises the following steps: real-time monitoring of the temperature field and the strain field of the horizontal member through the distributed intelligent fireproof units; judging whether the member is in uniform thermal expansion or non-uniform thermal deflection based on the monitoring data; intelligently selecting and triggering the corresponding hierarchical spray control strategy through the cooperative control mechanism according to the judgment result; Through the wireless Mesh network, the coordination of each intelligent fire prevention unit to execute the triggered spray strategy.

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