SAP accumulation body spraying fireproof packaging system with built-in horizontal component and implementation method of SAP accumulation body spraying fireproof packaging system

Abstract

The invention discloses an SAP accumulation body spraying fireproof packaging system with a built-in horizontal component and an implementation method of the SAP accumulation body spraying fireproof packaging system. The system comprises a distributed intelligent fireproof unit, a closed supercharged fluid distribution network and a water absorption fixing and sealing unit. Unit cooperation is achieved through a wireless Mesh network, a large-spraying-amount, small-spraying-amount and asymmetric compensation three-stage spraying mode is intelligently triggered according to the temperature / strain gradient, thermal buckling deformation is accurately restrained, and full-coverage and self-adaptive dynamic fireproof protection is provided for a horizontal component.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fire prevention of large-span space structures, and particularly relates to a SAP accumulation body spray fireproof packaging system with built-in horizontal components and an implementation method thereof. BACKGROUND

[0002] Large-span space structures are a manifestation of infrastructure construction level, and have been rapidly developed and widely applied in recent years, and are commonly used in large public buildings such as stadiums, railway stations, and airport terminals.

[0003] In the large-span space structure system, the latticed shell structure is widely used due to its light weight, large span, and flexible modeling. The latticed shell of such a structure is mainly built with light steel and aluminum alloy, each of which has its own characteristics: Light steel structure: It has the advantages of high strength, good toughness, and high degree of industrialization, and is the traditional mainstream material of large-span space structures.

[0004] Aluminum alloy structure: Compared with steel, aluminum alloy has the outstanding advantages of light weight, corrosion resistance, easy processing and shaping, and beauty, and is increasingly applied in large-span buildings. The aluminum alloy latticed shell usually adopts a plate-type node single-layer latticed shell system, and its design process is similar to that of ordinary steel latticed shell, and can adopt various flexible construction methods such as high-altitude bulk loading, hoisting, and sliding.

[0005] Whether it is a light steel or an aluminum alloy latticed shell structure, it is a key load-bearing component in large-span space buildings, and its safety directly determines the stability of the overall structure under extreme conditions. Although light steel and aluminum alloy have their own advantages as structural materials, they both have a common fatal weakness - poor fire resistance. Fire poses a serious threat to these two materials, mainly in the following aspects: Light steel structure: Although steel does not burn, it has a large thermal conductivity, and its strength will decrease sharply under high temperature in a fire. Generally, the yield strength of ordinary structural steel will decrease to about 60% of that at room temperature at 550℃, resulting in a significant decrease in structural bearing capacity and eventually causing overall collapse.

[0006] Aluminum alloy structure: Aluminum alloy not only has a low melting point (about 660℃), but also has a thermal conductivity about 3 times that of steel, which makes the aluminum alloy structure heat up faster in a fire and more likely to lose its load-bearing capacity. Studies have shown that the strength loss of aluminum alloy material at high temperatures above 300℃ can be more than 50%, and it deforms severely after being heated.

[0007] Large-span space buildings usually have the characteristics of high space and good air circulation, and the fire development is obviously different from that of general buildings. The fire temperature rising process of such space is different from that of small room fire, and the flame and high temperature smoke are more likely to accumulate under the ceiling and spread rapidly, forming overall heat radiation to the roof net shell structure and accelerating the failure of the structure. In the face of the serious threat of fire to light steel and aluminum alloy net shell structure, it has become an important and urgent task to carry out targeted fire prevention research.

[0008] The existing technical bottleneck mainly embodies in the following aspects: Firstly, although the existing fireproof measures for steel structure and aluminum alloy (such as coating, cladding, etc.) have been widely used in conventional components, their technical characteristics are difficult to meet the stringent requirements of modern large space structure net shell, the main problem is: 1. Durability and maintenance dilemma: the fireproof coating layer sprayed on site is easy to age and peel off, and its durability is difficult to guarantee in the complex nodes of net shell and high-altitude environment, and the maintenance cost is high.

[0009] 2. Space and shape restrictions: using concrete cladding or fireproof board wrapping will significantly increase the cross section of the net shell, occupy the effective building space, and completely change the mechanical shape and architectural aesthetic expression of the net shell.

[0010] 3. Insufficient flexibility and adaptability: the existing methods are mostly "passive wrapping", which is difficult to flexibly adapt to the different shapes and sizes of large space structure net shell under the premise of ensuring fireproof efficiency, and the installation convenience is poor.

[0011] The defects of the existing fireproof measures are shown in the following table: Fire protection measures Defects Sprayed fire protection material - Low coating strength, easy to damage by collision.- Relatively poor durability (e.g. weather resistance), need to maintain.- Suitable for concealed or low aesthetic requirements. Cladding fire protection board - For non-standard or complex shape components, the processing and installation are more complex.- Occupies a certain building space. Concrete / sand mortar cladding - Large self-weight, significantly increases the load of the structure.- Wet operation, long construction period, poor environment.- The largest increase in cross-sectional size. Secondly, the existing SAP fireproofing technology cannot meet the special protection needs of large-span horizontal components. SAP (super absorbent polymer) material can form a fireproof system with evaporation heat absorption potential after combining with water due to its excellent water absorption and water retention performance. At present, this technical idea has been explored in vertical components such as cold-formed steel wall and box frame, and the general implementation method is to statically fill SAP accumulation body in the cavity of the component. However, when the above idea is directly applied to horizontal components (such as net rack, truss, beam, etc.) in large-span space structures, more complex and unique problems will be encountered due to the structural characteristics and stress state of the components: the material distribution and coverage under gravity is more serious: the inner cavity bottom surface of the horizontal component is a natural settlement plane. Under the long-term action of gravity, the SAP accumulation body is more likely to form a hardened accumulation layer on the bottom surface, while the key fire-affected areas such as the top and sides of the component form a permanent protection blind area. This uneven distribution of "thin on top and thick on bottom" makes the top steel or aluminum structure of the horizontal component overheat and fail quickly due to the lack of effective cooling, which is much more harmful than the possible local weakness at the top of vertical components. The long-term maintenance and precise supply of water in large-span structures are challenging: the length of large-span horizontal components often reaches dozens of meters, and the cavity is not completely closed, so the internal water will evaporate along the length of the component. For a one-time static filling scheme, water loss will cause irreversible degradation of fireproofing performance. More importantly, the existing technology cannot achieve sensing and on-demand water supply for different areas inside the long-distance component, resulting in unreliable protection performance in space and time. The existing static scheme cannot respond to the thermodynamic behavior of the horizontal component: due to the uneven heating of the upper and lower surfaces, the horizontal component will produce significant thermal warping effect (i.e. the component arches upward). The existing static SAP scheme is completely powerless. It cannot balance the cross-section temperature difference through dynamic cooling distribution, nor can it actively suppress the harmful deformation caused by it through directional hydraulic intervention, which threatens the stability of the structure in a fire.

[0012] Therefore, the existing SAP fireproofing idea cannot establish a stable and full-coverage fireproof system in the horizontal component due to uneven gravity distribution and water supply failure. On the other hand, its static and indiscriminate working mode is seriously out of touch with the dynamic and non-uniform thermodynamic response of large-span horizontal components in a real fire. The current technology cannot provide a reliable fireproofing solution for horizontal load-bearing components that are crucial to the overall safety of large-span space structures.

[0013] In view of the above problems, it is urgent to propose a new fireproofing structure for the horizontal components of large-span space structures that is full-coverage, high-durability, does not change the appearance of the structure, and is sustainable. SUMMARY

[0014] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a SAP accumulation body spray fireproof packaging system with built-in horizontal components and an implementation method thereof, which realizes unit cooperation through a wireless Mesh network, intelligently triggers large, small and asymmetric compensation three-stage spraying modes according to temperature / strain gradient, accurately suppresses thermal warping deformation, and provides full coverage and adaptive dynamic fireproof protection for the horizontal components.

[0015] The present application solves the technical problems by adopting the technical solutions of: A SAP accumulation body spray fireproof packaging system with built-in horizontal components, comprising: a pressurized fluid distribution network, a water-absorbing solid sealing unit, and a plurality of intelligent fireproof units distributed in key parts of the horizontal components; each intelligent fireproof unit is integrated with a local processor, a temperature sensor array, a strain sensor array and an independently controlled spraying module; the pressurized fluid distribution network is connected to each spraying module and integrated in the internal cavity of the horizontal component; the water-absorbing solid sealing unit is fixed on the inner wall of the horizontal component and used for carrying and sealing superabsorbent resin particles; each local processor is interconnected through a wireless Mesh network and constructs a cooperative control mechanism; the system is configured to execute a hierarchical spraying control strategy, including: when the temperature monitored by any temperature sensor array is greater than a first temperature threshold, a large-volume spraying mode is started; 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 a strain gradient threshold, a small-volume spraying 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 spraying mode is started.

[0016] Preferably, in the large-volume spraying mode, the nozzle water pressure of the spraying module is 2.5-3.0 MPa, the cross-sectional spraying coverage angle is 130°-140°, and the duration is 25-30 seconds; in the small-volume spraying mode, the nozzle water pressure of the spraying module is 0.2-0.3 MPa, the cross-sectional spraying coverage angle is 90°-100°, and it operates in a periodic pulse mode.

[0017] Preferably, in the asymmetric compensation spraying mode, the working parameters of the spraying modules facing the high-temperature side and the low-temperature side of the component are independently adjusted to form a lateral pressure difference of 0.3-0.6 MPa to suppress thermal deflection deformation.

[0018] Preferably, the pressurized fluid distribution network is a closed pressurized design, with network terminals closed by pipe plugs and provided with automatic exhaust valves at the highest points 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.

[0019] Preferably, the water-absorbing solid sealing unit comprises a sheet layer honeycomb structure and the superabsorbent resin particles filled in the honeycomb cavities thereof; 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 water absorption to form a dense solidified layer on the surface of the cavity.

[0020] Preferably, the strain sensor array adopts high-temperature-resistant optical fiber strain sensors and is arranged on the key control section of the member.

[0021] Preferably, the first temperature threshold is 140℃-160℃, the second temperature threshold is 100℃ / m, and the strain gradient threshold is 50με / mm.

[0022] The application also provides an implementation method of the above-mentioned system, comprising the following steps: The temperature field and the strain field of the horizontal member are monitored in real time by the distributed intelligent fireproofing unit; Based on the monitoring data, it is judged whether the member is in uniform thermal expansion or in non-uniform thermal deflection state; According to the judgment result, the corresponding hierarchical injection control strategy is intelligently selected and triggered through the cooperative control mechanism; The triggered injection strategy is executed by the wireless Mesh network. Advantages

[0023] Compared with the prior art, the application has the following advantages: 1. The SAP particles are accurately sealed in the full-paved fixed sheet layer honeycomb structure with a filling amount of 1 / 4 to 1 / 2, which eliminates the flowability and gravity settlement risk of the SAP, and ensures the all-around protection of all inner wall surfaces (including the key top surface and side surface) of the horizontal member without weak points and high stability.

[0024] 2. The application realizes the directional and on-demand moisture supply for a tens-of-meters-span member through the distributed intelligent fireproofing unit, which senses the water content state (indirectly reflected by the temperature field and the SAP heat absorption efficiency) of different areas in real time and executes the "small injection amount maintenance" and "large injection amount compensation" strategies by the built-in spraying unit, thereby forming a dynamic and sustainable fireproofing cycle of "moisture fixation-evaporation heat absorption-intelligent supply-re-fixation", and ensuring the long-term reliability and effectiveness of the system.

[0025] 3. The invention introduces an asymmetric compensation spray mode based on a double-threshold judgment (temperature gradient and strain gradient). The system can actively identify the structural deflection trend caused by uneven heating, and by differentially adjusting the spray pressure, it can introduce a reverse thermal stress inside the member to actively suppress the thermal deflection deformation. This completely changes the traditional static mode of fire prevention, providing unprecedented structural safety for horizontal members.

[0026] 4. The invention realizes precise allocation of fire prevention cooling resources through a three-level strategy of "large spray volume", "small spray volume", and "compensation spray". It not only ensures rapid response capability in the early stage of fire, but also significantly reduces water resource and energy consumption through a low-power maintenance mode. This intelligent resource management strategy makes the system particularly suitable for large engineering projects with water resource shortages or sensitive to operating costs, demonstrating excellent engineering application value. BRIEF DESCRIPTION OF DRAWINGS

[0027] The invention will be further described below in conjunction with the drawings and examples.

[0028] Fig. 1 The overall structure of the horizontal member of the large-span space structure is provided for the embodiment of the invention.

[0029] Fig. 2 The network unit structure of the horizontal member of the large-span space structure is provided for the embodiment of the invention.

[0030] Fig. 3 The network unit structure of the fluid distribution network is provided for the embodiment of the invention.

[0031] Fig. 4 The structure of the omnidirectional atomization spray unit is provided for the embodiment of the invention.

[0032] Fig. 5 The structure of the network unit central hydraulic flow control joint is provided for the embodiment of the invention.

[0033] Fig. 6 The structure of the network unit central hydraulic flow control joint is provided for the embodiment of the invention. Fig. 5 The cross-sectional view of the network unit central hydraulic flow control joint is provided for the embodiment of the invention.

[0034] In the drawings: 1. Horizontal member; 2. Water absorption and sealing unit; 3. Built-in spray unit; 11. Bottom surface of horizontal member; 21. Honeycomb structure; 22. Superabsorbent resin particles; 31. Fluid distribution network; 32. Omnidirectional atomization spray unit; 33. Network unit central hydraulic flow control joint; 311. Fluid distribution network unit; 312. Pipe plug; 321. Single spray seat; 322. Atomization spray head; 323. Fan-shaped nozzle. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] Embodiment 1: In this embodiment, a specific implementation of a SAP accumulation body spray fireproof packaging system with built-in horizontal members is provided for a 45-meter-span net rack structure of a certain sports venue.

[0037] The high water-absorbent resin in this embodiment is referred to as SAP.

[0038] As shown in Fig. 1-Fig. 6 , this embodiment provides a SAP accumulation body spray fireproof packaging system with built-in horizontal members, a pressurized fluid distribution network, a water-absorbent and solid sealing unit 2, and a plurality of intelligent fireproof units distributed in key positions of the horizontal members 1. 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 is connected to each spray module and integrated in the internal cavity of the horizontal members 1. The water-absorbent and solid sealing unit 2 is fixed to the inner wall of the horizontal members 1 and used to carry and seal the high water-absorbent resin. Each local processor is interconnected through a wireless Mesh network, constructs a cooperative control mechanism, and communicates with a remote control platform. The system is configured to execute a hierarchical spray control strategy.

[0039] The key positions include but are not limited to the mid-span area, support area, and main compression members of the structure, which are crucial to the overall stability.

[0040] In this embodiment, for the 45-meter-span net rack structure of the sports venue, a finite element analysis software is used to establish a calculation model. By simulating the stress state of the structure under standard load conditions and conducting thermal-mechanical coupling analysis combined with the ISO-834 standard fire temperature curve, the cross sections of the members with the maximum internal force (axial force, bending moment) or the lowest stability coefficient in the fire environment are identified. In this embodiment, the key positions refer to the mid-span lower chord, the web members near the supports, and part of the upper chord determined by the above analysis. The intelligent fireproof units of the system are preferentially installed in these key positions.

[0041] The spray module and the pressurized fluid distribution network in this embodiment jointly constitute a built-in spray unit 3.

[0042] The water absorption solid sealing unit 2 comprises a sheet layer honeycomb structure 21 and high water absorption resin particles 22 filled in the honeycomb cavity; the honeycomb structure 21 adopts a sheet layer structure made of aramid paper honeycomb, the honeycomb aperture is 20 mm, the wall thickness is 0.2 mm, and the layer thickness is 10 mm. The material can still maintain stable physical and chemical properties at 220°C. The high water absorption resin particles 22 are heat-resistant polyacrylic acid sodium-based SAP, the particle size is controlled between 80-120 meshes, and the filling volume in the honeycomb cavity accounts for 1 / 3 of the volume of a single honeycomb cavity; the water absorption solid sealing unit 2 is fixed on the inner wall of the horizontal member 1 at a spacing of 200 mm by means of a large head screw.

[0043] The built-in spraying unit 3 comprises a fluid distribution network 31, i.e. a pressurized fluid distribution network, and a full-range atomizing spraying unit 32, i.e. a spraying module, installed on the fluid distribution network 31.

[0044] The fluid distribution network 31 is arranged along the center line of the bottom surface 11 of the horizontal member.

[0045] The fluid distribution network 31 is connected by a plurality of fluid distribution network units 311 through network unit center hydraulic flow control joints 33, and the terminal is closed by a pipe plug 312. The spherical cavity volume in the network unit center hydraulic flow control joint 33 is designed according to 18% of the total flow of a single network unit, forming an effective hydraulic buffer zone.

[0046] The full-range atomizing spraying unit 32 adopts a single spraying seat 321 to install an atomizing nozzle 322, and the atomizing nozzle 322 adopts a fan-shaped nozzle 323 with a 90° upward angle relative to the bottom surface.

[0047] The temperature sensor array is arranged at the key section of the member, including the bottom surface, side surface and top surface measuring points; the strain sensor array adopts a high-temperature resistant fiber optic strain sensor, specifically an FBG fiber grating sensor, which is arranged at the key control section of the member and used for real-time monitoring of the strain gradient distribution of the member section. The local processor is configured to execute a local control strategy, and a cooperative control mechanism coordinates the decisions of multiple intelligent fireproof units through a wireless Mesh network.

[0048] The built-in spraying unit 3, spraying control module, single spraying seat 321, atomizing nozzle 322, fan-shaped nozzle 323, fluid distribution network unit 311, network unit center hydraulic flow control joint 33, pipe plug 312, local processor, temperature sensor array, strain sensor array and remote control platform of the embodiment all adopt existing products or structures known to those skilled in the art, and the connection or control mode between them also adopts the existing connection or control mode known to those skilled in the art.

[0049] A high-temperature-resistant electric pressure regulating valve known to those skilled in the art is arranged on the connecting pipe of each atomizing nozzle 322 of the embodiment; the selection of the high-temperature-resistant electric pressure regulating valve needs to meet the fire resistance performance requirement of continuous operation for not less than 60 minutes at an environmental temperature of 250℃. The temperature measurement range of the temperature sensor array should cover 0℃ to 600℃, and the measurement accuracy should be not less than ±2%.

[0050] The system of the embodiment is installed according to the above requirements, specifically including the following steps: S1, water absorption and solid sealing unit installation: The honeycomb structure 21 is cut and matched, the superabsorbent resin particles 22 are filled into 1 / 3 of the cavity volume, and after gelatinization treatment, it is fixed on the inner wall of the component; a handheld low-pressure sprayer known to those skilled in the art is used, deionized water is used as the medium, and uniform spraying is performed perpendicular 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 placed and solidified in an environment with a temperature of 20±5℃ and a humidity of 50%±10% for 15 minutes; at this time, a lightly crosslinked gel layer is formed on the surface of the superabsorbent resin particles 22, and adhesion is generated between them and the honeycomb wall, but the air permeability and water storage space of the honeycomb cavity are not completely blocked; only after this treatment, the unit can be installed and fixed.

[0051] S2, built-in spraying unit installation: The fluid distribution network 31 is arranged according to the design requirements, and it is ensured that all terminals are closed with pipe plugs 312; the atomizing nozzle 322 is installed and adjusted to an angle of 90°.

[0052] S3, intelligent fireproofing unit installation: The temperature sensor array and the strain sensor array are arranged and connected to the local processor to establish a wireless Mesh network.

[0053] S4, system integration and debugging: After all connections are completed, the system is debugged, and the pressurization effect of the pressurized fluid distribution network and the cooperative control logic are tested.

[0054] The system operation method of the embodiment, the specific control strategy includes: Data acquisition: temperature and strain data are collected at a frequency of 10 times / second; State judgment: When the temperature monitored by any temperature sensor array is greater than 150℃, the large spray amount injection mode is started; 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 spray amount injection mode is started; 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 spray mode is started.

[0055] Spray control: Large spray volume mode: water pressure 2.8 MPa, coverage angle 135°, lasting for 28 seconds; Small spray volume mode: water pressure 0.25 MPa, coverage angle 95°, running in periodic pulse mode with 5 seconds of spraying and 15 seconds of intermittent; Asymmetric compensation mode: the local processor calls the spatial distribution data of the temperature sensor array in the unit to calculate the average temperature of the four areas of the bottom, left side, right side and top of the cross section of the member; the area with the highest average temperature lasting for two sampling periods is determined as the main fire surface; according to the orientation of the main fire surface, the target pressure of the spray heads at different positions in the unit is set according to the pre-set pressure mapping relationship in the local processor; the pressure mapping relationship is established based on the principle of "strengthening the cooling of the fire surface and weakening the cooling of the backfire surface to balance the temperature difference in the cross section", and the specific table is shown as follows:

[0056] The pressure configuration aims to form a high-intensity water curtain on the fire surface while reducing the cooling intensity on the backfire surface, thereby reducing the temperature gradient in the cross section of the member and fundamentally inhibiting the thermal bending deformation caused by uneven heating.

[0057] The local processor sends control signals to the high-temperature-resistant electric pressure regulating valve corresponding to each spray head through the PID control algorithm, dynamically adjusts the opening degree of the valve, and the PID control takes the deviation between the measured value of the outlet pressure of the spray head and the target value as the input. The control target is to stabilize the pressure within ±5% of the target value within 2 seconds; thereby forming a strengthened directional cooling water curtain pointing to the fire surface, and achieving active compensation for uneven heating of the structure.

[0058] In this way, a strengthened directional cooling water curtain is formed inside the member, and the cooling intensity of the water curtain is asymmetrically directed to the fire surface, thereby actively resisting the thermal stress and deformation of the structure caused by uneven heating.

[0059] The fluid distribution network 31 of the embodiment adopts a closed design, with a terminal closed and an automatic exhaust valve provided at the highest point, which automatically releases pressure when the pressure exceeds 4 MPa; the automatic exhaust valve of the embodiment adopts existing products or structures known to those skilled in the art, and the connection of the automatic exhaust valve with the fluid distribution network 31 also adopts existing connection modes known to those skilled in the art.

[0060] The wireless Mesh network adopts a star-mesh hybrid topology, and the network can be self-healed within 100 ms when any node fails, ensuring reliable transmission of control instructions.

[0061] Each intelligent fire protection unit always independently and concurrently executes the hierarchical spraying control strategy based on the data of the temperature sensor array and the strain sensor array of the unit.

[0062] The implementation of the cooperative control mechanism relies on the "neighbor relationship" established in the system initialization phase; the establishment process of the relationship is as follows: Neighbor discovery: after the system installation is completed and powered on, the wireless Mesh network automatically completes the physical connection. Subsequently, the local processor of each intelligent fire protection unit executes a network-wide neighbor discovery protocol once. The protocol requires each unit to broadcast a "hello" data packet containing its unique ID at a specific power, and listen to the "hello" packets from other units.

[0063] List construction: each local processor records other units that can stably receive its "hello" packet and successfully return an acknowledgement signal in its internal static neighbor list. This list is fixed after initialization and will not change unless the system topology structure is physically changed and reinitialized.

[0064] Neighbor definition: in the present 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 determinacy and predictability of the cooperative range.

[0065] The cooperative fire alarm response logic is as follows: When any intelligent fire protection unit (referred to as "alarm unit") determines that it meets the large fire mode trigger condition (i.e., the temperature monitored by any temperature sensor array is greater than 150°C), it immediately broadcasts a data frame containing the "fire alarm" level through the wireless Mesh network at the highest priority when entering the large spraying mode, and the frame contains its own unit ID.

[0066] All neighbor units around it that contain the alarm unit ID in their static neighbor list do not unconditionally enter the large fire mode after receiving the "fire alarm" broadcast, but start the following cooperative decision logic: The neighbor unit immediately checks its T_max, i.e., the maximum value of the readings of all temperature sensors of the intelligent fire protection unit on the monitored component section in the same sampling period.

[0067] If T_max ≥ 120°C: this indicates that the fire may have spread to this area, and the neighbor unit immediately enters the large spraying mode synchronously, forming a "regional defense" to surround and suppress the fire.

[0068] If self T_max < 120℃: This indicates that the unit is at the edge of fire or only affected by heat radiation. The unit then enters the "high alert" state. In this state, its local control strategy priority remains unchanged (still possible in small spray or asymmetric mode), but will increase the data sampling frequency to 20 times / second, and continuously monitor the network state, and be prepared for the fastest response to possible fire spread.

[0069] Other structures of the horizontal member 1 of the large-span space structure in the embodiment adopt the existing fireproof structure well known to those skilled in the art.

[0070] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification and equivalent change made on the basis of the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A SAP accumulation body sprinkling fireproof packaging system with built-in horizontal members, 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 to 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 spraying control strategy, comprising: when the temperature monitored by any temperature sensor array is greater than a first temperature threshold, a large-volume spraying mode is started; 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 a strain gradient threshold, a small-volume spraying 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 spraying mode is started.

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 spraying mode, the nozzle water pressure of the spray module is 2.5-3.0 MPa, the cross-sectional spraying coverage angle is 130°-140°, and the duration is 25-30 seconds; in the small-volume spraying mode, the nozzle water pressure of the spray module is 0.2-0.3 MPa, the cross-sectional spraying 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 spraying 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 pressurized fluid distribution network is a closed pressurization 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.

5. 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.

6. The SAP accumulation body spray fireproofing system with built-in horizontal members 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.

7. 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.

8. A method for implementing the SAP accumulation body spray fireproof packaging system with built-in horizontal components according to any one of claims 1-7, characterized in that, The system comprises the following steps: S1, real-time monitoring of the temperature field and strain field of the horizontal member through the distributed intelligent fireproof units; S2, judging whether the member is in uniform thermal expansion or non-uniform thermal deflection state based on the monitoring data; S3, intelligently selecting and triggering the corresponding hierarchical spraying control strategy through the cooperative control mechanism according to the judgment result. S4. Through the wireless Mesh network, the intelligent fire-preventing units are coordinated to execute the triggered spraying strategy.

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