Construction technology for fire-fighting automatic alarm system

Abstract

The invention belongs to the technical field of fire-fighting alarm system construction, and discloses a construction technology for a fire-fighting automatic alarm system, and the technology comprises the following steps: S1, cable laying and protection; s2, accurately positioning and installing the detector; s3, system grounding and electromagnetic protection; s4, dynamic parameter adjustment and linkage test; and S5, performing three-dimensional shape scanning and compensation correction. A stable charge release path is formed through an independent grounding system and a multi-level shielding technology, external electromagnetic interference is effectively isolated, and real-time performance and accuracy of fire alarm signal transmission are guaranteed. The spatial layout optimization of the detector is combined with a laser calibration mechanism, the influence of structural shielding and airflow disturbance on sensitivity is broken through, and millisecond-level capture and positioning of fire characteristic signals are realized. A dynamic parameter closed-loop control and multi-system linkage verification technology ensures the cooperative response efficiency of emergency equipment under extreme working conditions, and constructs a whole-process security closed loop from early warning to disposal.

Description

Technical Field

[0001] The invention belongs to the technical field of fire alarm system construction, and in particular relates to a construction process for an automatic fire alarm system. Background Art

[0002] The automatic fire alarm system is an intelligent device that provides early warning and emergency response to fires through intelligent sensing and coordinated control. It consists of smoke detectors, temperature sensors, flame detectors, sound and light alarms, a control host, and linkage modules. The system monitors smoke concentration, temperature changes, and flame signals in the environment in real time. When the detection value exceeds the preset threshold, it immediately triggers the sound and light alarm and accurately locates the fire source. It also activates the sprinkler system, smoke exhaust fans, emergency lighting, and other equipment, automatically shutting off non-fire power sources, and forming a multi-level prevention and control system. Its core advantage lies in its ability to improve false alarm rate control through multi-sensor fusion technology, combined with the Internet of Things platform to achieve remote monitoring and data analysis. It is widely used in commercial buildings, industrial plants, and public places, significantly improving fire response speed and minimizing casualties and property losses.

[0003] However, the traditional automatic fire alarm system still has shortcomings during the construction process. For example, the cable laying is not standardized, the fire-resistant and flame-retardant cable standards are not strictly implemented during construction, the cable spacing is insufficient or the cable crosses the high-voltage lines without metal shielding tubes, resulting in electromagnetic interference and false alarms; the fireproof sealing of the cable trough is not strict, which is easy to fail in the event of a fire; the detector installation positioning is inaccurate, the smoke / temperature detector does not avoid the air-conditioning outlet and the beam obstruction area, or the installation height exceeds the specification, resulting in delayed signal capture in the early stage of the fire; the flame detector's field of view is blocked by columns and equipment, and its sensitivity decreases by more than 40%; the system grounding and shielding are missing, the control host grounding resistance is greater than 4Ω, and there is no independent lightning protection grounding electrode, which makes the circuit board vulnerable to lightning strikes; the signal line shielding layer is single-ended grounded or not grounded, introducing interference sources such as frequency conversion equipment and motors, resulting in a bus communication packet loss rate of more than 5%. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction process for an automatic fire alarm system to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a construction process for an automatic fire alarm system, comprising the following steps:

[0006] S1: Cable laying and protection;

[0007] S2: Precise positioning and installation of detectors;

[0008] S3: System grounding and electromagnetic protection;

[0009] S4: Dynamic parameter adjustment and linkage testing;

[0010] S5: 3D shape scanning and compensation correction;

[0011] The cable laying and protection include standardized installation of cable troughs, cable shielding and anti-interference treatment, fireproof sealing and margin reservation; the precise positioning and installation of detectors include installation of smoke / temperature detectors and calibration of the field of view of flame detectors; the system grounding and electromagnetic protection include construction of an independent grounding system and signal line shielding layer treatment; the dynamic parameter adjustment and linkage test include closed-loop control of the molten pool temperature and verification of the system linkage function; the three-dimensional morphology scanning and compensation correction include pre-compensation for secondary deformation and enhanced acceptance of non-destructive testing.

[0012] As a further technical solution of the present invention, the standardized installation of the trunking includes using 304 stainless steel trunking with a wall thickness of ≥1.5mm, the trunking is divided into independent channels for strong and weak electricity, the spacing between the strong power line (AC 220V) and the weak current signal line (DC 24V) is ≥50mm, galvanized angle steel brackets (L50×50×5mm) are set every 1.2m in the trunking, fireproof sealant (temperature resistance ≥1000℃) is applied to the joints of the trunking, and NH-RVS 2×1.5mm is laid in the trunking. 2 Twisted-pair fire-resistant and flame-retardant cable, with ceramic fiber fire-resistant casing wrapped on the outside (temperature resistance ≥1200℃).

[0013] As a further technical solution of the present invention, the cable shielding and anti-interference treatment includes the signal line adopting STP-3×1.0mm 2 Shielded twisted pair, shield layer single end grounded to a dedicated copper bus (cross-sectional area ≥ 25mm 2 ), grounding resistance ≤ 2Ω, aluminum-magnesium alloy shielding tubes (wall thickness ≥ 2mm) are installed at the intersection of high-voltage lines and low-voltage lines, and both ends extend to cover 300mm outside the intersection area.

[0014] As a further technical solution of the present invention, the fireproof sealing and margin reservation include using expanding fireproof mud (expansion coefficient ≥ 5 times) to seal the cable when it passes through the wall, reserving a maintenance margin ≥ 500mm at both ends of the cable, and a bending radius ≥ 8 times the cable diameter.

[0015] As a further technical solution of the present invention, the installation of the smoke / temperature detector includes selecting a photoelectric smoke detector (sensitivity 0.05dB / m), which is installed at a distance of ≤30cm from the ceiling and ≥1.5m from the air-conditioning outlet, with a horizontal spacing of ≤7.5m and a vertical spacing of ≤15m. The detector base is made of ABS flame-retardant material and is fixed with M6 stainless steel expansion bolts. The base wire has a reserved margin of ≥150mm and is connected with crimped terminals. The field of view angle calibration of the flame detector includes installing an infrared flame detector (wavelength 4.35μm±0.1μm), with a field of view of 120°, avoiding obstructions from columns and equipment, an installation height of 3.5m from the ground, an inclination angle of ≤5°, and a laser locator is used to calibrate the horizontal deviation to ≤2mm.

[0016] As a further technical solution of the present invention, the independent grounding system is constructed by setting an independent grounding electrode (galvanized angle steel L50×50×5mm, length 2.5m, buried depth ≥0.8m), the grounding grid adopts 40×4mm galvanized flat steel, the grid spacing is ≤5m, the grounding resistance is ≤1Ω, and the control host grounding wire adopts BVR-25mm 2 The copper core wire is isolated from the high-voltage grounding system. The signal line shielding layer processing includes single-point grounding of the signal line shielding layer at the control host end. The grounding terminal adopts a gold-plated copper crimping terminal (contact resistance ≤ 0.1Ω), and an insulating heat shrink tube (voltage resistance ≥ 3kV) is installed between the shielding layer and the cable sheath.

[0017] As a further technical solution of the present invention, the closed-loop control of the molten pool temperature includes an integrated K-type thermocouple (temperature measurement range 0-1300°C) to monitor the welding area temperature in real time, and adjusts the laser power (4kW±5%) through a PID controller (accuracy ±1°C). The pulse frequency is dynamically adjusted in the range of 80-150Hz, and the argon flow is closed-loop controlled (12L / min±0.5L). The system linkage function verification includes using a multi-channel signal generator to simulate a fire alarm signal, testing the linkage logic of the alarm controller (response time ≤2s) and the sprinkler system and smoke exhaust fan (start-up delay ≤3s), the sound pressure level of the sound and light alarm is ≥90dB (1m distance), and the light intensity is ≥100cd.

[0018] As a further technical solution of the present invention, the secondary deformation pre-compensation includes using a GOM ATOS Q12M three-dimensional scanner (resolution 0.02mm) to obtain the deformation data of the pipe beam after electrophoresis baking, and generating a compensation surface model through Zeiss CALYPSO software. The reverse pre-deformation accuracy is ±0.1mm, and the compensation area covers 50mm on both sides of the weld. The non-destructive testing and enhanced acceptance include using a Yxlon FF35 CT device (resolution 3μm) to perform three-dimensional reconstruction of the pores inside the weld. The pore diameter is ≤0.2mm and is qualified. The elbow overlap area is scanned in a sector shape using a 64-element phased array probe (frequency 5MHz), and the crack detection threshold is ≥0.3mm.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention completely solves the problems of high false alarm rate and signal distortion caused by strong and weak electrical interference in traditional processes by constructing a global standardized cable protection system and electromagnetic compatibility network. The independent grounding system and multi-level shielding technology form a stable charge release path, effectively isolating external electromagnetic interference and ensuring the real-time and accuracy of fire alarm signal transmission. The optimization of the detector's spatial layout combined with the laser calibration mechanism breaks through the influence of structural obstruction and airflow disturbance on sensitivity, and realizes millisecond-level capture and positioning of fire characteristic signals. Dynamic parameter closed-loop control and multi-system linkage verification technology ensure the coordinated response efficiency of emergency equipment under extreme working conditions, and build a full-process security closed loop from early warning to disposal.

[0021] 2. The present invention relies on high-precision three-dimensional reconstruction and intelligent algorithms to achieve the prediction and reverse correction of material deformation, significantly improving the assembly accuracy and structural stability of complex components. The integrated application of microfocus tomography and phased array ultrasonic technology breaks through the bottleneck of traditional flaw detection methods in identifying hidden defects and ensures non-destructive acceptance of key load-bearing parts. In-depth correlation analysis of process parameters and quality data drives the dynamic optimization of welding heat input and shielding gas flow, forming a self-iterative intelligent manufacturing closed loop. The full life cycle quality traceability system provides data support for the long-term and reliable operation of the fire protection system, promotes the upgrading of building security facilities towards intelligence and zero defects, and comprehensively improves the safety protection capabilities of personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0023] Figure 2 A schematic diagram of the process for precise positioning and installation of the detector of the present invention;

[0024] Figure 3 A schematic diagram of the process for precise positioning and installation of the detector of the present invention;

[0025] Figure 4 Schematic diagram of the process of grounding and electromagnetic protection of the system of the present invention;

[0026] Figure 5 Schematic diagram of the process of dynamic parameter adjustment and linkage testing of the present invention;

[0027] Figure 6 Schematic diagram of the pipeline for three-dimensional shape scanning and compensation correction of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figures 1 to 6 As shown, in an embodiment of the present invention, a construction process for an automatic fire alarm system includes the following steps:

[0030] S1: Cable laying and protection;

[0031] S2: Precise positioning and installation of detectors;

[0032] S3: System grounding and electromagnetic protection;

[0033] S4: Dynamic parameter adjustment and linkage testing;

[0034] S5: 3D shape scanning and compensation correction;

[0035] Cable laying and protection include standardized installation of cable troughs, cable shielding and anti-interference treatment, fireproof sealing and margin reservation; precise positioning and installation of detectors include installation of smoke / temperature detectors and calibration of flame detector field of view; system grounding and electromagnetic protection include independent grounding system construction and signal line shielding layer treatment; dynamic parameter adjustment and linkage testing include closed-loop control of molten pool temperature and verification of system linkage function; three-dimensional morphology scanning and compensation correction include pre-compensation of secondary deformation and enhanced acceptance of non-destructive testing.

[0036] Through a standardized cable protection system and electromagnetic compatibility design, signal transmission stability is significantly improved, effectively suppressing the risk of false alarms caused by external interference. Detector spatial positioning and field-of-view calibration technology enhance the ability to capture early-stage fire characteristics, ensuring multi-dimensional fire identification accuracy. An independent grounding architecture and multi-layer shielding form a full-area electromagnetic protection network, ensuring the operational reliability of the equipment in complex industrial environments. A real-time dynamic control mechanism achieves millisecond-level accuracy in multi-system coordinated response, establishing a closed-loop control system for fire warning and emergency linkage. The deep integration of three-dimensional morphology reconstruction and non-destructive testing technology establishes a full-life cycle quality traceability system, providing data support for hidden defect repair and system iterative optimization, and comprehensively enhancing the safety redundancy and intelligent operation and maintenance level of the building fire protection system.

[0037] like Figure 2 As shown, the standardized installation of the trunking includes the use of 304 stainless steel trunking with a wall thickness of ≥1.5mm. The trunking is divided into independent channels for strong and weak electricity. The distance between the strong power line (AC 220V) and the weak current signal line (DC 24V) is ≥50mm. Galvanized angle steel brackets (L50×50×5mm) are set every 1.2m in the trunking. Fireproof sealant (temperature resistance ≥1000℃) is applied to the joints of the trunking. NH-RVS2×1.5mm is laid in the trunking. 2 Twisted-pair fire-resistant flame-retardant cable, with ceramic fiber fire-resistant casing (temperature resistance ≥ 1200°C) wrapped on the outside. Cable shielding and anti-interference treatment, including signal line using STP-3×1.0mm 2 Shielded twisted pair, shield layer single end grounded to a dedicated copper bus (cross-sectional area ≥ 25mm 2 ), grounding resistance ≤ 2Ω, aluminum-magnesium alloy shielding tubes (wall thickness ≥ 2mm) installed at the intersection of high-voltage and low-voltage lines, with both ends extending 300mm beyond the intersection area. Fireproof sealing and margin reservation include using expansive fireproof mortar (expansion coefficient ≥ 5 times) to seal cables passing through walls, leaving a maintenance margin of ≥ 500mm at both ends of the cables, and a bend radius ≥ 8 times the cable diameter.

[0038] By constructing a multi-layered protection system using high-specification stainless steel cable trunking and specialized fireproof materials, physical isolation and electromagnetic compatibility of strong and weak current lines are achieved, effectively avoiding the risk of signal interference. Standardized bracket layout and rigid structural design ensure the long-term stability of the cable trunking. Combined with fire-resistant cables and expansion sealing technology, the integrity and insulation performance of the cables under extreme high temperatures are greatly improved. Directional grounding of the shielding layer and coverage with alloy protective pipes form a full-area anti-interference network, ensuring accurate and reliable transmission of weak current signals. Reasonable bending allowances are reserved and the wall-penetrating sealing process is standardized, taking into account both installation convenience and subsequent maintenance needs, avoiding cable aging caused by stress concentration. The overall solution is progressive from material selection, space planning to dynamic protection, significantly improving the environmental adaptability and emergency response reliability of the fire alarm system.

[0039] like Figure 3As shown, the installation of smoke / temperature detectors includes the use of photoelectric smoke detectors (sensitivity 0.05dB / m), which are installed at a distance of ≤30cm from the ceiling and ≥1.5m from the air-conditioning outlet, with a horizontal spacing of ≤7.5m and a vertical spacing of ≤15m. The detector base is made of ABS flame-retardant material and fixed with M6 stainless steel expansion bolts. The base wire has a reserved margin of ≥150mm and is connected with crimped terminals. The flame detector field of view angle calibration includes the installation of an infrared flame detector (wavelength 4.35μm±0.1μm) with a field of view of 120°, avoiding obstructions from columns and equipment, an installation height of 3.5m from the ground, an inclination angle of ≤5°, and a laser locator is used to calibrate the horizontal deviation to ≤2mm.

[0040] By optimizing detector selection and spatial layout, the ability to capture characteristic signals in the early stages of a fire is enhanced, ensuring highly sensitive identification of smoke and temperature anomalies. Standardized installation height and spacing design avoids airflow disturbances and structural obstruction interference, and combined with flame-retardant base and crimp terminal connection technology, the long-term stability of the equipment in high-temperature environments is improved. The flame detector's field of view angle precision calibration technology breaks through the limitations of traditional blind spots, achieving zero-dead-angle coverage through laser positioning, and refined control of tilt angles and horizontal deviations significantly improves fire source location accuracy. Standardized wire margin reservation and seismic-resistant fixing technology take into account both installation efficiency and ease of subsequent maintenance, providing dual guarantees for fire warning response speed and system reliability in complex building scenarios.

[0041] like Figure 4 As shown, the independent grounding system construction includes setting up independent grounding electrodes (galvanized angle steel L50×50×5mm, length 2.5m, buried depth ≥0.8m), grounding grid using 40×4mm galvanized flat steel, grid spacing ≤5m, grounding resistance ≤1Ω, and control host grounding wire using BVR-25mm 2 The copper core wire is isolated from the high-voltage grounding system. The signal line shielding layer processing includes single-point grounding of the signal line shielding layer at the control host end. The grounding terminal adopts a gold-plated copper crimping terminal (contact resistance ≤ 0.1Ω), and an insulating heat shrink tube (voltage resistance ≥ 3kV) is installed between the shielding layer and the cable sheath.

[0042] Through an independent grounding system and directional treatment of the shielding layer, a full-area electromagnetic protection system is constructed to effectively isolate strong electrical interference and eliminate potential difference hazards, thereby ensuring the transmission stability of weak current signals. The grid grounding structure composed of galvanized angle steel and flat steel greatly improves the lightning protection capability. Combined with the copper core wire isolation design, it prevents stray current from corroding the control host. The single-point grounding of the shielding layer and the gold-plated terminal process realize a precise charge release path, and the insulation protection treatment completely blocks the risk of leakage, forming multiple protections from macro grounding to micro contacts. The overall solution breaks through the interference bottleneck of the traditional common grounding system, significantly improves the anti-interference and operational reliability of fire alarm equipment in complex electromagnetic environments, and provides underlying security for the millisecond-level response of fire warning signals.

[0043] like Figure 5 As shown in the figure, the closed-loop control of the molten pool temperature includes an integrated K-type thermocouple (temperature measurement range 0-1300℃) to monitor the temperature of the welding area in real time, and the laser power (4kW±5%) is adjusted by a PID controller (accuracy ±1℃). The pulse frequency is dynamically adjusted in the range of 80-150Hz, and the argon flow is closed-loop controlled (12L / min±0.5L). The system linkage function verification includes using a multi-channel signal generator to simulate a fire alarm signal, testing the linkage logic of the alarm controller (response time ≤2s) and the sprinkler system and smoke exhaust fan (start-up delay ≤3s), the sound pressure level of the sound and light alarm is ≥90dB (1m distance), and the light intensity is ≥100cd.

[0044] Through real-time temperature monitoring and dynamic parameter adjustment mechanisms, the welding heat input and shielding gas flow rate are precisely controlled to ensure the stability of the thermodynamic behavior of the molten pool and effectively suppress metallurgical defects such as pores and cracks. The intelligent closed-loop control system breaks through the limitations of traditional processes that rely on manual experience to adjust parameters, and improves the welding consistency of high-strength and lightweight materials. The linkage verification technology simulates real fire alarm scenarios, comprehensively tests the coordinated response efficiency of alarm triggering, equipment startup, and sound and light alarms, verifies the millisecond-level matching accuracy of logic control and actuators, and builds a full-process closed loop for fire emergency response. The dual technology integration not only ensures the structural strength and fatigue life of key components, but also enhances the reliability and safety redundancy of the fire protection system under extreme working conditions, providing core support for the intelligent upgrade of building fire protection facilities.

[0045] like Figure 6 As shown in the figure, secondary deformation pre-compensation includes using a GOM ATOS Q 12M 3D scanner (resolution 0.02mm) to obtain the deformation data of the pipe beam after electrophoresis baking, and generating a compensation surface model using Zeiss CALYPSO software. The reverse pre-deformation accuracy is ±0.1mm, and the compensation area covers a range of 50mm on both sides of the weld. The non-destructive testing and enhanced acceptance include using a Yxlon FF35 CT device (resolution 3μm) to perform 3D reconstruction of the pores inside the weld. The pore diameter is ≤0.2mm, and it is qualified. A 64-element phased array probe (frequency 5MHz) is used to perform sector scanning in the elbow overlap area, and the crack detection threshold is ≥0.3mm.

[0046] High-precision 3D scanning technology is used to intelligently predict the secondary deformation trend of materials, and the deformation amount is corrected in advance based on the reverse compensation mechanism to ensure the dimensional stability and assembly consistency of complex structural parts. Combining microfocus tomography and phased array ultrasonic technology, all-round three-dimensional detection of internal defects in welds is achieved, breaking through the bottleneck of traditional flaw detection methods in identifying hidden pores and microcracks. Dynamic compensation models are linked with non-destructive testing data for analysis to establish a closed loop for process parameter optimization, significantly improving the fatigue strength and energy absorption efficiency of lightweight components. The multi-dimensional quality verification system provides technical support for the zero-defect delivery of key load-bearing components, while establishing a digital process benchmark to promote the in-depth application of intelligent manufacturing in safety-sensitive areas.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A construction process for an automatic fire alarm system, characterized in that: The following steps are involved: S1: Cable laying and protection; S2: Precise positioning and installation of detectors; S3: System grounding and electromagnetic protection; S4: Dynamic parameter adjustment and linkage testing; S5: 3D shape scanning and compensation correction; The cable laying and protection include standardized installation of cable troughs, cable shielding and anti-interference treatment, fireproof sealing and margin reservation; the precise positioning and installation of detectors include installation of smoke / temperature detectors and calibration of the field of view of flame detectors; the system grounding and electromagnetic protection include construction of an independent grounding system and signal line shielding layer treatment; the dynamic parameter adjustment and linkage test include closed-loop control of the molten pool temperature and verification of the system linkage function; the three-dimensional morphology scanning and compensation correction include pre-compensation for secondary deformation and enhanced acceptance of non-destructive testing.

2. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The standardized installation of the cable trunking includes the use of 304 stainless steel cable trunking with a wall thickness of ≥1.5mm, the cable trunking is divided into independent channels for strong and weak electricity, the distance between the strong power line (AC 220V) and the weak current signal line (DC 24V) is ≥50mm, galvanized angle steel brackets (L50×50×5mm) are set every 1.2m in the cable trunking, fireproof sealant (temperature resistance ≥1000℃) is applied to the joints of the cable trunking, and NH-RVS2×1.5mm is laid in the cable trunking. 2 Twisted-pair fire-resistant and flame-retardant cable, with ceramic fiber fire-resistant casing wrapped on the outside (temperature resistance ≥1200℃).

3. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The cable shielding and anti-interference treatment include the signal line using STP-3×1.0mm 2 Shielded twisted pair, shield layer single end grounded to a dedicated copper bus (cross-sectional area ≥ 25mm 2 ), grounding resistance ≤ 2Ω, aluminum-magnesium alloy shielding tubes (wall thickness ≥ 2mm) are installed at the intersection of high-voltage lines and low-voltage lines, and both ends extend to cover 300mm outside the intersection area.

4. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The fireproof sealing and margin reservation include using expanding fireproof mud (expansion coefficient ≥ 5 times) to seal the cables when they pass through the wall, reserving a maintenance margin ≥ 500mm at both ends of the cables, and a bending radius ≥ 8 times the cable diameter.

5. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The installation of the smoke / temperature detector includes the use of a photoelectric smoke detector (sensitivity 0.05dB / m), which is installed at a distance of ≤30cm from the ceiling and ≥1.5m from the air-conditioning outlet, with a horizontal spacing of ≤7.5m and a vertical spacing of ≤15m. The detector base is made of ABS flame-retardant material and is fixed with M6 stainless steel expansion bolts. The base wire has a reserved margin of ≥150mm and is connected with crimped terminals. The field of view angle calibration of the flame detector includes the installation of an infrared flame detector (wavelength 4.35μm±0.1μm), with a field of view of 120°, avoiding obstructions from columns and equipment, an installation height of 3.5m from the ground, an inclination angle of ≤5°, and a laser locator is used to calibrate the horizontal deviation to ≤2mm.

6. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The independent grounding system construction includes setting up independent grounding electrodes (galvanized angle steel L50×50×5mm, length 2.5m, buried depth ≥0.8m), grounding grid using 40×4mm galvanized flat steel, grid spacing ≤5m, grounding resistance ≤1Ω, and control host grounding wire using BVR-25mm 2 The copper core wire is isolated from the high-voltage grounding system. The signal line shielding layer processing includes single-point grounding of the signal line shielding layer at the control host end. The grounding terminal adopts a gold-plated copper crimping terminal (contact resistance ≤ 0.1Ω), and an insulating heat shrink tube (voltage resistance ≥ 3kV) is installed between the shielding layer and the cable sheath.

7. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The closed-loop control of the molten pool temperature includes an integrated K-type thermocouple (temperature measurement range 0-1300°C) to monitor the welding area temperature in real time, and adjusts the laser power (4kW±5%) through a PID controller (accuracy ±1°C). The pulse frequency is dynamically adjusted in the range of 80-150Hz, and the argon flow is closed-loop controlled (12L / min±0.5L). The system linkage function verification includes using a multi-channel signal generator to simulate a fire alarm signal, testing the linkage logic of the alarm controller (response time ≤2s) and the sprinkler system and smoke exhaust fan (start-up delay ≤3s), the sound pressure level of the sound and light alarm is ≥90dB (1m distance), and the light intensity is ≥100cd.

8. The construction process for an automatic fire alarm system according to claim 1, characterized in that: The secondary deformation pre-compensation includes using a GOM ATOS Q 12M three-dimensional scanner (resolution 0.02mm) to obtain the deformation data of the pipe beam after electrophoresis baking, and generating a compensation surface model using Zeiss CALYPSO software. The reverse pre-deformation accuracy is ±0.1mm, and the compensation area covers a range of 50mm on both sides of the weld. The non-destructive testing and enhanced acceptance include using a Yxlon FF35 CT device (resolution 3μm) to perform three-dimensional reconstruction of the pores inside the weld. The pore diameter is ≤0.2mm and is considered qualified. A 64-element phased array probe (frequency 5MHz) is used to perform sector scanning in the elbow overlap area, and the crack detection threshold is ≥0.3mm.

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