Steel support construction method for monitoring and protecting a canopy

Abstract

The present application relates to the technical field of steel support construction, in particular to a kind of steel support construction method for arcade monitoring and protection, comprising the following steps: arcade steel support foundation construction, arcade steel plate installation under arcade beam, arcade steel support installation, arcade beam bottom sensor installation, intelligent alarm device installation and debugging, routine maintenance;The steel support construction method for arcade monitoring and protection can build a "real-time monitoring, physical support" dual security system, real-time early warning is realized through sensor, and emergency bearing capacity is provided by relying on steel support beam, solving the collapse safety hazard of traditional single monitoring technology in emergency response window period;Low-disturbance construction is adopted in the application, which is beneficial to minimize the damage to the original structure of arcade and historical features, suitable for the preservation and protection of cultural buildings, can realize the linkage control of monitoring and support at the same time, and takes into account the dual needs of historical building culture protection and block open operation, with practicality.

Description

Technical Field

[0001] This invention relates to the field of steel support construction technology, specifically to a method for constructing steel supports for monitoring and protecting arcade buildings. Background Technology

[0002] Historical arcade cultural blocks are important carriers of local cultural memory. However, these historical buildings generally suffer from problems such as being old, dilapidated, declining in function, and poor structural safety. Moreover, the property rights of most buildings are complicated, which poses a great challenge to the overall revitalization and transformation of the blocks.

[0003] In the process of revitalizing and utilizing historical arcade blocks, it is common to encounter situations where some arcade buildings cannot be systematically reinforced and renovated. These buildings are located inside open blocks, and if they are directly closed off, it will severely disrupt the overall appearance of the block and hinder its overall openness and revitalization. If they are left open for use, there is a great risk of collapse. Current technologies for dealing with such buildings are relatively simple: using single structural monitoring can only achieve data warnings and cannot provide physical support when the structure undergoes sudden deformation. Even after the warning, there is still a safety risk within the emergency response window. Traditional temporary steel supports often neglect the protection of the valuable elements of historical buildings, and during construction, they can easily cause irreversible damage to the distinctive components such as arcade brackets and moldings. Furthermore, they lack a linkage mechanism with the monitoring system and cannot achieve intelligent safety management.

[0004] Therefore, there is an urgent need to develop a construction method that can take into account both real-time monitoring and emergency protection; in view of this, we propose a steel support construction method for monitoring and protection of arcade buildings. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section and provide a construction method for steel supports for monitoring and protecting arcade buildings.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for constructing steel supports for monitoring and protecting arcade buildings, characterized by the following steps: Step 1: Construction of the steel support foundation for the arcade, pouring reinforced concrete foundation and pre-embedding steel structure embedded parts, ensuring that the embedded parts are centered, at the correct elevation and firmly welded to the steel cage; Step 2: Install steel plate under the arcade beam. Grind and clean the bottom of the old beam under the concrete arcade to the solid layer at the mid-span. Drill holes and embed 4 plain round steel bars with threads at the bottom. Install the steel plate and tighten the threads at the bottom with nuts to fix it. Level the steel plate. Fill the gap between the steel plate and the bottom of the beam with grout. Measure the levelness in real time during and after grouting to see if it meets the requirements. Step 3: Install the steel support for the arcade. After the foundation strength reaches the design requirements, install the upper steel support beam. Adjust the horizontal error of the steel support beam to ≤ ±0.5mm and keep the distance between it and the steel plate constant. Weld and fix the steel support beam and perform anti-corrosion and fireproofing treatment. Step 4: Install the sensor at the bottom of the arcade beam. Lay out the positioning guide fixing plate, sensor unit, and bottom support angle steel. Weld the positioning guide fixing plate and the guide plates located on both sides of the bottom support angle steel. Insert the sensor unit so that the upper end of the sensor unit abuts against the steel plate. Electrically connect the instrument to set the initial stress of the sensor unit to 0-0.1MPa, and then fix the bottom support angle steel to complete the limit installation. Step 5: Installation and debugging of the intelligent alarm device. Install the sensor alarm device on the steel support beam, connect it electrically to the sensor unit and the background control system, set the initial value and complete the alarm trigger debugging. During debugging, the bottom support angle steel can be raised to trigger the alarm, and the accuracy of its data and alarm broadcast can be checked. Debug it multiple times until it is correct. Step Six: Routine maintenance, regularly check the operating status of sensors and alarm devices, and promptly repair any faults.

[0007] Preferably, in step two, the leveling steel plate is set to have a horizontality error of ≤ ±0.5 mm.

[0008] Preferably, in step three, the steel support beam is welded using carbon dioxide gas shielded welding, and the welding process is set as follows: first spot welding for positioning, then full welding, with a weld height of not less than 8mm and a welding defect level of not less than Class II.

[0009] Preferably, in step four, the sensor unit adopts a rod-type fiber optic grating stress-strain integrated sensor with a rod diameter of φ22mm, and is set with a strain range of ±5000uε, a gauge length of 500mm, a maximum deformation of ±2.5mm, a stress of 0-10MPa, and an operating temperature range of -40℃ to 80℃.

[0010] Preferably, in step five, the alarm triggering debugging method adopts a graded simulation loading method, applying simulated stresses of 1MPa, 4MPa and 5MPa respectively, and setting the corresponding triggering green normal state, yellow alarm and red alarm, setting the data transmission delay to no more than 1s, the alarm sound pressure level to no less than 85dB, and the voice broadcast clarity to no less than 90%.

[0011] Preferably, in step six, routine maintenance includes zero-point calibration of the sensor unit, with a calibration error not exceeding ±0.05 MPa; It also includes detecting the thickness of the anti-corrosion layer and performing ultrasonic flaw detection on the steel support beam, with the anti-corrosion layer thickness set to be no less than 120μm.

[0012] Preferably, the sensing alarm device has a built-in data processing module that collects stress and strain data of the sensor unit in real time, which is used to monitor the deformation rate of the arcade beam and trigger a red alarm when the deformation rate exceeds 0.5 mm / h.

[0013] Preferably, the alarm mechanism parameters of the graded simulation loading method include: The green status setting corresponds to a monitored deformation value of no more than -0.1 mm and a monitored stress value of no more than 1 MPa.

[0014] Preferably, the alarm mechanism parameters of the graded simulation loading method further include: The yellow alert setting corresponds to a deformation value of -0.1 to -2.0 mm or a stress value of 1 to 4 MPa.

[0015] Preferably, the alarm mechanism parameters of the graded simulation loading method further include: The red alert setting corresponds to a monitored deformation value ≤ -2.0mm or a monitored stress value ≥ 4.0MPa.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The steel support construction method for monitoring and protecting arcade buildings can build a dual safety system of "real-time monitoring and physical support". It can realize real-time early warning of the health status of the arcade building structure through stress and strain integrated sensors, and rely on steel support beams to provide emergency bearing capacity, thus solving the collapse safety hazard of traditional single monitoring technology during the emergency response window. 2. This application adopts low-disturbance construction, which is conducive to minimizing damage to the original structure and historical features of the arcade buildings. It is suitable for the preservation and protection of cultural buildings, and can simultaneously achieve joint control of monitoring and support. It takes into account the dual needs of the protection of historical building culture and the open operation of the block, and is practical. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the arcade structure distribution according to an embodiment of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the AA section; Figure 3 For the present invention Figure 1 Schematic diagram of the BB cross section; Figure 4 This is a partially enlarged schematic diagram of part A of the present invention.

[0018] The meanings of the labels in the diagram are as follows: 1. Tie rod type fiber optic grating stress-strain integrated sensor; 2. Sensor alarm device; 3. Adjustable bottom support angle steel; 4. Guide fixing plate; 5. Steel plate; 6. Plain round steel bar; 7. Steel support beam. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-4 The present invention will describe the above technical solution in detail through the following embodiments: This embodiment describes a construction method for steel supports for monitoring and protecting arcade buildings. It adopts an integrated steel support system for real-time monitoring and safety protection, which can achieve real-time monitoring of the structural health of arcade buildings and physical protection against the risk of sudden collapse, while minimizing disturbance to the original historical buildings.

[0021] Before formal construction, comprehensive preparatory work must be completed. First, the concrete strength of the arcade beams is tested using the rebound method, and internal defects of the beams are detected using ultrasonic testing. The locations of the steel supports are determined and placed at the mid-span of the arcade beams. At the same time, the positions and dimensions of distinctive historical components such as arcade brackets, moldings, and carvings are measured, and the avoidance routes of the steel supports are planned in advance. In terms of material preparation, Q235B grade steel is used for all steel materials in this embodiment, E43 series welding rods are used, non-shrink C40 grade grouting material is used, A-grade modified epoxy resin anchoring adhesive is used, epoxy zinc-rich primer + polyurethane topcoat system is used for anti-corrosion coating, and steel structure fireproof coating with a fire resistance limit of not less than 1.5 hours is used. In the equipment preparation stage, a high-precision level with an accuracy of 0.5mm / m, a portable fiber optic demodulator, a coating thickness gauge, an ultrasonic flaw detector, a carbon dioxide gas shielded welding machine, an impact drill, and a high-pressure air gun are equipped. All measuring equipment is calibrated and qualified before it can be put into use.

[0022] Specifically, after completing the above-mentioned pre-construction preparations, the construction of the arcade steel support foundation will be carried out first. According to the calculated load of the arcade beam, this embodiment is designed with a maximum load of 150kN for a single beam. A C30 reinforced concrete foundation with dimensions of 600mm×600mm×500mm will be poured. The foundation reinforcement will use a two-way steel mesh with a protective layer thickness of 30mm. Subsequently, steel structure embedded parts will be pre-embedded. The embedded parts will be made of 200mm×200mm×10mm steel plates. The steel plates will be firmly welded to the foundation reinforcement cage. After the foundation is poured, it will be covered with geotextile and watered for curing for no less than 7 days. The upper construction can only be carried out after the concrete strength reaches the standard strength. During the foundation construction process, it is strictly forbidden to disturb the original column bases and underground pipelines of the arcade.

[0023] After the basic curing is completed, the steel plate installation under the arcade beam is carried out. First, at the mid-span of the old beam under the concrete arcade, the loose and sandy surface concrete at the bottom of the beam is removed with an angle grinder until a solid concrete base is exposed. Then, the surface dust and debris are blown away with a high-pressure air gun. Next, four drilling points are marked in a square distribution with a spacing of 70mm on the bottom of the ground beam. Holes are drilled using an impact drill with a diameter of 18mm and a depth of 240mm, not less than 15 times the diameter of the plain round steel bar 6. After drilling, the holes are cleaned repeatedly three times with a brush and a high-pressure air gun to ensure that there is no dust or water inside the holes. Then, Grade A modified epoxy resin anchoring adhesive is injected, and four Φ16 plain round steel bars 6 with M14 threads at the bottom are screwed into the bottom of the holes. Excess anchoring adhesive is cleaned up in time. During the curing period (at room temperature for no less than 24 hours), it is strictly forbidden to touch the steel bars. After the anchoring adhesive has fully cured, align the Φ18 holes pre-drilled at the four corners of the 100mm×100mm×20mm steel plate 5 with the plain round steel bar 6 and insert them. Screw in the M14 nut at the bottom of the steel bar. During the tightening process, use a high-precision level to measure the levelness of the steel plate 5 in real time. By adjusting the tightness of the four nuts, control the levelness error of the steel plate 5 within the range of ≤±0.5mm. Finally, use non-shrink C40 grout to fill the gap between the steel plate 5 and the bottom of the beam. When filling, slowly inject from one side of the steel plate until the other side overflows with full grout to ensure that the gap is completely filled. During the filling process and within 24 hours after filling, continuously monitor the levelness of the steel plate 5 and adjust it in time if any deviation occurs.

[0024] After steel plate 5 is installed and passes inspection, the arcade steel supports are installed. In this embodiment, steel support beam 7 is made of HN200×100×5.5×8 hot-rolled H-beam, and its length is determined according to the net height from the bottom of the arcade beam to the top of the foundation. Before installation, the installation center line of the steel support beam is marked on the foundation embedded parts. It is then manually hoisted into place. Subsequently, the verticality and horizontality of steel support beam 7 are adjusted. A feeler gauge and a spirit level are used to measure and ensure that the horizontality error of the top surface of steel support beam 7 is ≤±0.5mm, and the distance between the top surface of steel support beam 7 and the bottom surface of steel plate 5 is constant at 50mm. After confirming that the position is correct, carbon dioxide gas shielded welding is used for welding. The welding process is as follows: first, spot welding for positioning, with each positioning weld being 20-30mm long and spaced 200mm apart. After confirming that the position is correct, full welding is then performed, with a weld height of not less than 8mm and a welding defect level of not less than II. Welding is then completed. After removing the welding slag, all welds are 100% inspected using an ultrasonic flaw detector. Unqualified welds are removed and re-welded. After the welding inspection is passed, anti-corrosion and fireproofing treatments are carried out. First, the surface of steel support beam 7 is sandblasted to remove rust, reaching the Sa2.5 rust removal standard. Then, two coats of epoxy zinc-rich primer are applied, each with a dry film thickness of not less than 40μm. After the primer is completely dry, two coats of polyurethane topcoat are applied, each with a dry film thickness of not less than 40μm, for a total anti-corrosion layer thickness of not less than 120μm. Finally, an ultra-thin steel structure fireproof coating is applied to ensure a fire resistance limit of not less than 1.5 hours. When steel support beam 7 passes over characteristic historical components such as arcade brackets, moldings, and carvings, the corresponding parts of the steel support beam are bent upwards at 45°. The bent section uses a rounded transition with R=150mm to avoid stress concentration and completely avoid the architectural elements that need to be protected, ensuring that the historical features are not damaged.

[0025] After the steel support beam 7 is installed and its anti-corrosion and fireproofing treatment is completed, the sensor at the bottom of the arcade beam is installed. In this embodiment, a tie-rod type fiber optic stress-strain integrated sensor 1 with a tie rod diameter of φ22mm is used. Its technical parameters are: strain range ±5000uε, gauge length 500mm, maximum deformation ±2.5mm, stress range 0-10MPa, and working temperature range -40℃-80℃. First, according to the gauge length of 500mm of the sensor 1 and the position of the top surface of the steel support beam 7, the installation positions of the guide fixing plate 4 and the bottom support angle steel 3 are marked on the top surface of the steel support beam 7. The guide fixing plate 4 is made of 100mm×50mm×6mm steel plate with a φ24mm guide hole drilled in the center. The bottom support angle steel 3 is made of L50×50×5mm angle steel with a length of 100mm. After the positioning is correct, the guide fixing plate 4 is welded first, with its two ends fully flush with the top surface of the steel support beam 7. Weld the bottom support angle steel 3 with a weld height of 6mm. Then weld guide plates on both sides of the installation position of the bottom support angle steel 3. The guide plates are made of 50mm×50mm×5mm angle steel with a length of 100mm and a distance of 55mm between the two guide plates to ensure that the bottom support angle steel 3 can slide freely up and down along the guide plates. After the fixing parts are welded, insert the rod of the sensor 1 into the center hole of the guide fixing plate 4 so that the pressure head at the upper end of the sensor accurately abuts against the center of the bottom surface of the steel plate 5. Connect the portable fiber optic grating demodulator and slowly adjust the height of the bottom support angle steel 3 upward until the demodulator shows that the initial stress of the sensor 1 is in the range of 0-0.1MPa. After confirming that the initial stress meets the requirements, weld the bottom support angle steel 3 to the guide plates on both sides to complete the limit installation of the sensor. During the welding process, wrap the sensor body and fiber optic cable with a damp cloth to prevent high temperature damage to the fiber optic grating and cable insulation layer.

[0026] After the sensor is installed, the intelligent alarm device is installed and debugged. The sensor alarm device 2 is fixed to the side of the steel support beam 7 with M8 bolts, with the installation height 1.5-1.8m above the ground, so that personnel can easily observe and hear the alarm sound. In this embodiment, the sensor alarm device 2 has a built-in data processing module, an audible and visual alarm module, and a 4G wireless transmission module. Then, the fiber optic interface of the sensor unit is connected to the fiber optic input interface of the sensor alarm device 2 with a fiber optic patch cable, ensuring that the connector is clean and the connection is firm. The sensor alarm device 2 is connected to the street background control system through the 4G wireless module to realize remote data transmission and real-time monitoring.

[0027] It should be noted that, in this embodiment, after the line connection is completed, graded alarm parameters are set in the background control system. The green normal state corresponds to a monitored deformation value ≤ -0.1mm and a monitored stress value ≤ 1MPa; the yellow alarm corresponds to a monitored deformation value of -0.1mm to -2.0mm or a monitored stress value of 1MPa to 4MPa; and the red alarm corresponds to a monitored deformation value ≤ -2.0mm or a monitored stress value ≥ 4MPa, or a deformation rate exceeding 0.5mm / h. After the parameters are set, a graded simulation loading method is used for debugging. The deformation of the arcade beam is simulated by slowly lifting the bottom support angle steel 3 with a jack. When a simulated stress of 1MPa is applied, the system should show... The system should display a green normal state with no alarms. When a simulated stress of 4MPa is applied, the system should trigger a yellow alarm, emitting a continuous warning sound and announcing, "The arcade structure is dangerous; please do not linger." When a simulated stress of 5MPa is applied, the system should trigger a red alarm, emitting a short, piercing alarm sound and announcing, "The arcade structure is in serious danger; please evacuate immediately." During the debugging process, the data transmission delay should be checked to ensure it does not exceed 1 second. The alarm sound pressure level should be measured with a sound level meter to ensure it is not lower than 85dB. The voice clarity should be tested with a voice clarity tester to ensure it is not lower than 90%. The debugging process should be repeated at least three times until all functions and parameters meet the requirements.

[0028] After the entire steel support and monitoring system is installed and debugged, it enters the routine maintenance phase. This embodiment sets a comprehensive inspection to be conducted every six months for the first year, and annually thereafter. An additional special inspection should be conducted after extreme weather events such as typhoons and rainstorms. Maintenance includes zero-point calibration of the tension-type fiber optic grating stress-strain integrated sensor 1 using a portable fiber optic grating demodulator, with the calibration error controlled within ≤±0.05MPa; checking for damage, aging, or compression of the fiber optic cables; checking for loose connectors; and promptly replacing or repairing any problems found. The audible and visual alarm of the sensing alarm device 2 is also tested. The system includes alarm and data transmission functions to ensure timely and accurate transmission of alarm signals to the backend. It checks the built-in battery power and replaces it when insufficient. A coating thickness gauge is used to measure the thickness of the anti-corrosion layer on the steel support beam 7, ensuring it is not less than 120μm. Damaged anti-corrosion layers are repaired promptly. An ultrasonic flaw detector is used to re-inspect the welds of the steel support beam, addressing any welding defects immediately. The verticality and horizontality of the steel support beam are checked; adjustments are made promptly if deviations exceed allowable values. Simultaneously, the steel plate 5 is checked for rust and deformation, and the anchorage of the plain round steel bars 6 is verified for firmness and loose nuts; any issues are addressed by tightening or replacing the bars.

[0029] It should be explained that the working principle of this embodiment is as follows: Under normal use, the upper end of the rod-type fiber optic grating stress-strain integrated sensor 1 abuts against the steel plate 5, and the lower end is supported by the bottom support angle steel 3. The initial stress is maintained at 0-0.1MPa. The stress and deformation data of the arcade beam are collected in real time and transmitted to the street background control system through the sensor alarm device 2 to achieve 24-hour uninterrupted monitoring. When the arcade beam undergoes slight deformation due to aging, external force, or other factors, and the monitoring data reaches the yellow alarm threshold, the system automatically triggers a yellow alarm, reminding the management personnel to close the area under the arcade in time and prohibit tourists from entering. When the deformation of the arcade beam intensifies, and the monitoring data reaches the red alarm threshold or the deformation rate exceeds 0.5mm / h, the system immediately triggers a red alarm. At the same time, the steel support beam 7, as a physical protection structure, is ready to support the settled arcade beam and transfer the upper load to the reinforced concrete foundation, effectively preventing the arcade collapse accident. After receiving the alarm, the management personnel can immediately activate the emergency plan, evacuate the surrounding tourists, set up a warning line, and take further reinforcement or demolition measures to ensure the safety of personnel and historical buildings.

[0030] This embodiment integrates real-time monitoring and physical support technologies, enabling early warning of the health status of the arcade structure and providing emergency load-bearing capacity in the event of sudden deformation. This significantly improves the safety management level of historical districts. Furthermore, the construction process involves only a small amount of drilling and rebar installation at the bottom of the arcade beams, with independent foundations for the steel supports, preserving the original building structure. The 45° bend design for the distinctive arcade components effectively protects the cultural value elements of the historical buildings. The innovatively defined graded alarm standard for historical arcade structures, combined with a remote monitoring system, enables rapid response and precise handling of abnormal situations, reducing management costs and emergency risks. All components are prefabricated in the factory and assembled on-site, simplifying welding and installation processes, shortening the construction cycle, and minimizing the impact on the normal operation of the district. This makes it particularly suitable for promotion and application in open historical and cultural districts.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A construction method for steel supports for monitoring and protection of arcade buildings, characterized in that: Includes the following steps: Step 1: Construction of the steel support foundation for the arcade, pouring reinforced concrete foundation and pre-embedding steel structure embedded parts, ensuring that the embedded parts are centered, at the correct elevation and firmly welded to the steel cage; Step 2: Install steel plate under arcade beam. Grind and clean the bottom of the old beam under the concrete arcade to the solid layer at the mid-span position. Drill holes and embed 4 plain round steel bars (6) with threads at the bottom. Install steel plate (5) and fix it by tightening the threads at the bottom with nuts. Level the steel plate (5). Fill the gap between the steel plate (5) and the bottom of the beam with grout. Measure the levelness in real time during and after grouting to see if it meets the requirements. Step 3: Install the steel support for the arcade. After the foundation strength reaches the design requirements, install the upper steel support beam (7). Adjust the horizontal error of the steel support beam (7) to ≤ ±0.5mm and keep the distance between it and the steel plate (5) constant. Weld and fix the steel support beam (7) and carry out anti-corrosion and fireproofing treatment. Step 4: Install the sensor at the bottom of the arcade beam, lay out the positioning guide fixing piece (4), sensor unit, and bottom support angle steel (3), weld the positioning guide fixing piece (4) and the guide plates on both sides of the bottom support angle steel (3), insert the sensor unit, so that the upper end of the sensor unit abuts against the steel plate (5), and then fix the bottom support angle steel (3) after setting the initial stress of the sensor unit to 0-0.1MPa to complete the limit installation; Step 5: Installation and debugging of intelligent alarm device. Install the sensor alarm device (2) on the steel support beam (7), connect it to the background control system via electrical connection with the sensor unit, set the initial value and complete the alarm trigger debugging. When debugging, the bottom support angle steel (3) can be raised to trigger the alarm, check its data and the accuracy of the alarm broadcast, and debug it multiple times until it is correct. Step Six: Routine maintenance, regularly check the operating status of sensors and alarm devices, and promptly repair any faults.

2. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 1, characterized in that: In step two, the leveling steel plate (5) is set to have a horizontality error of ≤ ±0.5 mm.

3. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 1, characterized in that: In step three, the steel support beam (7) is welded using carbon dioxide gas shielded welding. The welding process is to first spot weld for positioning and then fully weld. The weld height is not less than 8mm and the welding defect level is not lower than level II.

4. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 1, characterized in that: In step four, the sensor unit adopts a rod-type fiber optic grating stress-strain integrated sensor (1) with a rod diameter of φ22mm, and is set with strain range of ±5000uε, gauge length of 500mm, maximum deformation of ±2.5mm, stress of 0-10MPa, and working temperature range of -40℃-80℃.

5. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 1, characterized in that: In step five, the alarm triggering debugging method adopts the graded simulation loading method, applying simulated stresses of 1MPa, 4MPa and 5MPa respectively, and setting the corresponding green normal state, yellow alarm and red alarm. The data transmission delay is set to not exceed 1s, the alarm sound pressure level is not less than 85dB and the voice broadcast clarity is not less than 90%.

6. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 1, characterized in that: In step six, routine maintenance includes zero-point calibration of the sensor unit, with a calibration error not exceeding ±0.05MPa; It also includes testing the thickness of the anti-corrosion layer and conducting ultrasonic flaw detection on the steel support beam (7), with the anti-corrosion layer thickness set to be no less than 120μm.

7. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 5, characterized in that: The sensing alarm device (2) has a built-in data processing module for real-time acquisition of stress and strain data of the sensor unit, which is used to monitor the deformation rate of the arcade beam. When the deformation rate exceeds 0.5 mm / h, a red alarm is triggered.

8. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 5, characterized in that: The alarm mechanism parameters of the graded simulation loading method include: The green status setting corresponds to a monitored deformation value of no more than -0.1 mm and a monitored stress value of no more than 1 MPa.

9. The construction method for steel supports for monitoring and protecting arcade buildings as described in claim 8, characterized in that: The alarm mechanism parameters of the graded simulation loading method also include: The yellow alert setting corresponds to a deformation value of -0.1 to -2.0 mm or a stress value of 1 to 4 MPa.

10. The construction method for steel supports for monitoring and protection of arcade buildings as described in claim 9, characterized in that: The alarm mechanism parameters of the graded simulation loading method also include: The red alert setting corresponds to a monitored deformation value ≤ -2.0mm or a monitored stress value ≥ 4.0MPa.

Images