Air curtain drag reduction underpinning method and underpinning structure

Abstract

The invention provides an air curtain anti-drag underpinning method and an underpinning structure, and relates to the technical field of ruin protection engineering, a stable air curtain can be formed between the underpinning structure and a soil body through the designed air curtain, friction force is remarkably reduced, disturbance to a ruin is reduced, and integrity and stability of the ruin are protected to the maximum extent; gradual air curtain starting, accurate jacking and micro-disturbance control measures in the construction process ensure that the underpinning process is accurate and controllable, and the influence on the ruins is further reduced; in the construction process, according to the counter-force requirement of vertical underpinning, dynamic balance control over vertical deformation of the site building is achieved through gas pressure control of the gas curtain system.

Description

Technical Field

[0001] This invention relates to the field of archaeological site protection engineering technology, and more specifically, to an air curtain drag reduction and replacement method and replacement structure. Background Technology

[0002] In archaeological site protection and relocation projects, numerous challenges arise when the site needs to be underpinned. Firstly, traditional underpinning methods have problems when the underpinning structure is located below the site and is subsequently covered by it. For example, the friction between the underpinning structure and the soil is significant during the underpinning process, easily leading to soil plugging at the ends. Continued jacking can cause soil deformation, thus disturbing the site. Secondly, traditional underpinning jacking structures use hydraulic control systems to synchronously coordinate structural deformation and tilting during vertical lifting. This adjustment method is rather crude and cannot achieve precise control of structural deformation, making it unsuitable for protected cultural relics such as archaeological sites. Therefore, a more effective underpinning method and structure are urgently needed to solve these problems. Summary of the Invention

[0003] This invention provides an air curtain drag reduction and replacement method, comprising:

[0004] S1. A replacement structure is used, and the replacement structure is equipped with jet components. The replacement structure is equipped with an air supply pipeline system, and the air supply pipeline system is connected to an air supply device. The air supply device supplies air to the jet components through the air supply pipeline system so as to form an air curtain by being ejected through the jet components.

[0005] S2. Pre-construction preparations, including:

[0006] S201. Fabrication and placement of the underpinning structure: The underpinning structure is hoisted to the predetermined position below the site, and the position of the underpinning structure is monitored in real time.

[0007] S202. Monitoring of the site and surrounding environment: Before construction, conduct a detailed survey of the site, record the surface material, texture, and damage, and establish a high-precision three-dimensional model; reasonably arrange displacement monitoring points and vibration monitoring points around the site, install monitoring equipment, calibrate and debug it, and establish a real-time data acquisition system;

[0008] S3. The replacement construction process includes:

[0009] S301. Gradual Air Curtain Start-up and Fine-tuning: 10-15 minutes before the jacking of the support structure, start the high-pressure air compressor at 30%-50% of the normal operating pressure, slowly increase the gas pressure and flow rate, observe the formation of the air curtain and the site response, and dynamically fine-tune the air curtain pressure and flow rate based on real-time monitoring data; establish a dynamic threshold model, and flexibly adjust the threshold of micro-disturbance control according to the structural characteristics and geological conditions of different sites in order to protect the site;

[0010] S302, Precision jacking and micro-disturbance control: The jacking and support structure is jacked using jacks; micro-deformation monitoring sensors are arranged on the support structure and the site to monitor minute deformations in real time. When the deformation exceeds the preset threshold, the jacking is paused, the cause is analyzed, and the jacks are finely adjusted through the servo control system.

[0011] S303, Support and Vertical Dynamic Adjustment: After the horizontal advancement of the support structure is completed, gas pressure is simultaneously supplied to the bottom of the air curtain system during the vertical jacking process. During the vertical jacking construction, the vertical gas pressure of the air curtain system is dynamically adjusted according to the real-time monitored vertical displacement and deformation values ​​of the site building to ensure that the vertical deformation of the site building remains in a balanced and stable state under the dynamic adjustment of the air curtain system.

[0012] As a preferred technical solution of this application, the jet component is made of hard alloy material and coated with an anti-corrosion coating.

[0013] As a preferred technical solution of this application, a high-pressure air compressor is selected as the air supply equipment. The exhaust volume meets the gas flow requirements of all jet components, the exhaust pressure reaches 0.6-1.2MPa, and it is equipped with a high-precision air filter and drying device. When installing the air curtain system, the air tightness of the air curtain system is tested and adjusted to ensure that the jet flow of each jet component is uniform and a stable air curtain is formed.

[0014] As a preferred technical solution of this application, the air tightness test uses gas at 1.5 times the normal working pressure and maintains it for 20 minutes. If the pressure drop does not exceed 0.05 MPa, it indicates good air tightness. Under complex geological conditions, the air tightness test standard is adjusted according to simulation analysis.

[0015] As a preferred technical solution of this application, S202 also includes: developing an integrated monitoring and control system to collect, analyze and provide feedback on monitoring data in real time, and to adjust the air curtain pressure and jacking parameters through automated control.

[0016] As a preferred technical solution of this application, in S303, the jacking speed of the support structure is accurately within the error range of ±1mm / min, and the jacking force error is within ±5%.

[0017] As a preferred technical solution of this application, it also includes: S4, post-construction processing; post-construction processing includes:

[0018] S401. Remove the air curtain system: Remove the air supply pipeline system and unscrew the jet components; for components that are difficult to disassemble directly, use cutting technology to cut them into small pieces and remove them, use a small vacuum cleaner to collect the debris, and increase the protection measures for the surrounding environment during the cutting process.

[0019] S402. Comprehensive assessment and long-term protection of the site: After construction is completed, a comprehensive assessment of the site will be conducted, and the impact will be judged by comparing the data before and after construction; for areas with potential damage, appropriate materials and technologies will be used for reinforcement, and a long-term monitoring system will be established; the long-term monitoring system will include monitoring and response measures for environmental factors.

[0020] The replacement structure, applied to the air curtain drag reduction replacement method, includes several steel beams, with a base plate connecting the bottoms of the steel beams. Several air nozzle mounting modules are provided on both sides of the steel beams, and a connecting pipe connects the air nozzle mounting modules on both sides of the steel beams. Several air nozzle components are provided on the air nozzle mounting modules, and the air nozzle components are distributed on the sides, top, and bottom of the air nozzle mounting modules. The air nozzle components are used to spray gas to form an air curtain.

[0021] As a preferred technical solution of this application, the gas supply pipeline system is set between several gas nozzle installation modules on one side of the steel beam. The gas supply pipeline system includes several sets of gas transmission pipelines, which are alternately set with several gas nozzle installation modules on one side of the steel beam. Each set of gas transmission pipelines consists of several airflow branch pipes, and the number of airflow branch pipes in each set of gas transmission pipelines decreases sequentially along the jacking direction of the support structure.

[0022] As a preferred technical solution of this application, the nozzle component is an air jet component, which includes a nozzle fixing seat that is threadedly connected to the nozzle mounting module. The nozzle fixing seat contains a nozzle body, one end of which extends out from the nozzle fixing seat, and a sealing ring is also provided inside the nozzle fixing seat.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Effective drag reduction and site protection: The designed air curtain can form a stable air curtain between the supporting structure and the soil, significantly reducing friction, minimizing disturbance to the site, and maximizing the protection of the site's integrity and stability;

[0025] 2. Precise construction and control: The gradual activation of the air curtain, precise jacking, and micro-disturbance control measures during the construction process ensure that the replacement process is precise and controllable, further reducing the impact on the site;

[0026] 3. Air curtain system for support: During construction, based on the reaction force requirements of vertical support, the gas pressure of the air curtain system is controlled to achieve dynamic balance control of the vertical deformation of the ruins building. Attached Figure Description

[0027] Figure 1 A schematic diagram of the replacement structure provided in this application;

[0028] Figure 2A structural schematic diagram of the replacement structure provided in this application from another perspective;

[0029] Figure 3 A bottom view of the support structure provided in this application;

[0030] Figure 4 A partial structural diagram of the replacement structure provided in this application;

[0031] Figure 5 A schematic diagram of the planar structure of the steel beam provided in this application;

[0032] Figure 6 A schematic diagram of the air nozzle mounting module provided in this application;

[0033] Figure 7 This is a schematic diagram of the structure of the connecting pipe provided in this application;

[0034] Figure 8 This is a structural schematic diagram of the air nozzle component provided in this application;

[0035] Figure 9 A flowchart of the air curtain drag reduction and replacement method provided in this application.

[0036] The image shows:

[0037] 1. Steel beam; 101. Base plate; 2. Nozzle mounting module; 3. Airflow distribution pipe; 5. Nozzle components; 6. Nozzle mounting base; 7. Nozzle body; 8. Sealing ring; 9. Connecting pipe. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0039] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] Example 1, please refer to Figure 9 Air curtain drag reduction and replacement method, including:

[0042] S1. A replacement structure is used, and the replacement structure is equipped with jet components. The replacement structure is equipped with an air supply pipeline system, and the air supply pipeline system is connected to an air supply device. The air supply device supplies air to the jet components through the air supply pipeline system so as to form an air curtain by being ejected through the jet components.

[0043] The gas supply pipeline system uses high-pressure resistant, corrosion resistant and flexible metal hoses as gas supply pipelines. The gas supply pipelines are arranged in shallow grooves along the flange edge or web of steel beam 1.

[0044] A small, high-efficiency high-pressure air compressor was selected as the air supply equipment, with an exhaust volume that meets the gas flow requirements of all jet components and an exhaust pressure of 0.6-1.2 MPa. It is equipped with a high-precision air filter and dryer. During the installation of the air curtain system, airtightness testing and adjustments were performed to ensure uniform gas flow to each jet component, forming a stable air curtain. The airtightness test used gas at 1.5 times the normal operating pressure, maintained for 20 minutes; a pressure drop of no more than 0.05 MPa indicated good airtightness. Under complex geological conditions, the airtightness testing standards were adjusted based on simulation analysis to ensure the reliability of the air curtain system.

[0045] When in use, the specific location and number of jet components are determined according to the dimensions of the underpinning structure and the geological conditions of the site. For example, in an underpinning project at a certain site, after calculation and simulation analysis, a total of 10 rows of jet components were arranged on the front flange and jet components were arranged on the belly plate.

[0046] S2. Pre-construction preparations, including:

[0047] S201. Fabrication and Placement of the Underpinning Structure: Arrange steel beams 1 according to design requirements and weld them into a whole using a suitable method; if carbon dioxide gas shielded welding is used, strictly control the welding parameters, and perform non-destructive testing after completion; if ultrasonic testing is used, no welding defects are found; use a crane to lift the underpinning structure to the predetermined position below the site, and monitor the position of the underpinning structure in real time using high-precision measuring instruments to ensure that the placement deviation does not exceed ±5mm in the horizontal direction and ±3mm in the elevation direction; the underpinning structure can adopt a prefabricated or modular design (such as pre-measured welding) to reduce on-site construction time and costs, while improving the controllability of construction quality;

[0048] S202. Monitoring of the Site and Surrounding Environment: Before construction, conduct a detailed survey of the site (using technologies such as 3D laser scanning and ground-penetrating radar), record the surface material, texture, and damage, and establish a high-precision 3D model; rationally arrange displacement monitoring points and vibration monitoring points around the site, for example, 10 displacement monitoring points and 8 vibration monitoring points; install monitoring equipment (total station, level, accelerometer, etc.), calibrate and debug, and establish a real-time data acquisition system; develop an integrated monitoring and control system to collect, analyze, and feedback monitoring data in real time, and adjust the air curtain pressure and jacking parameters through automated control to reduce manual intervention and improve construction efficiency and accuracy;

[0049] S3. The replacement construction process includes:

[0050] S301. Progressive Air Curtain Start-up and Fine-tuning: 10-15 minutes before the jacking of the support structure, start the high-pressure air compressor at 30%-50% of the normal operating pressure, slowly increase the gas pressure and flow rate, observe the formation of the air curtain and the site response, and dynamically fine-tune the air curtain pressure and flow rate based on real-time monitoring data; for example, when a small displacement change is detected in a certain area of ​​the site, the system automatically analyzes and fine-tunes the flow rate of the jet components in that area or the overall air curtain pressure; establish a dynamic threshold model, and flexibly adjust the threshold of micro-disturbance control according to the structural characteristics and geological conditions of different sites to protect the site;

[0051] S302. Precision jacking and micro-disturbance control: Jacks (equipped with servo control systems) are used to jack up the support structure; micro-deformation monitoring sensors (fiber optic grating sensors, strain gauges, etc.) are arranged on the support structure and the site to monitor minute deformations in real time. When the deformation exceeds a preset threshold, jacking is paused, the cause is analyzed, and the jacks are finely adjusted through the servo control system. For example, if the micro-deformation monitoring sensor detects a 0.2° tilt in the support structure, jacking is immediately paused, the jacking force is adjusted through the servo control system, the tilt is corrected, and jacking continues.

[0052] S303, Support and Vertical Dynamic Adjustment: After the horizontal advancement of the support structure is completed, during the vertical jacking (in addition to the conventional vertical jacking reaction system), gas pressure is simultaneously supplied to the bottom of the air curtain system to increase the vertical jacking reaction force of the support structure; during the vertical jacking construction, the vertical gas pressure of the air curtain system is dynamically adjusted according to the real-time monitored vertical displacement deformation values ​​of the site building to ensure that the vertical deformation of the site building remains in a balanced and stable state under the dynamic adjustment of the air curtain system;

[0053] Furthermore, in S303, the jacking speed of the support structure is precisely within the error range of ±1 mm / min, and the jacking force error is within ±5%.

[0054] It also includes: S4, post-construction treatment; post-construction treatment includes:

[0055] S401. Dismantle the air curtain system: Dismantle the air supply pipeline system, unscrew the air jets. The air supply pipeline adopts a modular design and is connected by quick-disassembly connectors. For components that are difficult to disassemble directly, use cutting techniques (such as low-temperature plasma cutting or mechanical cutting) to cut them into small pieces and remove them. Use small vacuum equipment to collect the debris. During the cutting process, increase the protection measures for the surrounding environment (such as using fireproof cloth to cover the surrounding structure to avoid damage caused by sparks during the cutting process) to avoid potential damage to the soil or supporting structure around the site.

[0056] S402. Comprehensive Assessment and Long-Term Protection of the Site: After construction, a comprehensive assessment of the site will be conducted (using existing testing technologies) to compare data before and after construction to determine the extent of the impact. For potentially damaged areas, appropriate materials and technologies will be used for reinforcement, such as repairing surface cracks with inorganic cementitious materials, reinforcing internal structures with micro-anchors or fiber-reinforced materials, and establishing a long-term monitoring system. The long-term monitoring system will include monitoring and response measures for environmental factors (such as changes in temperature and humidity, groundwater levels, etc.) to ensure the stability of the site in long-term use.

[0057] The design of the support structure facilitates the dismantling of the air curtain system, and the comprehensive post-construction assessment and long-term protection measures provide strong support for the long-term preservation of the site.

[0058] Example 2, please refer to Figures 1-8 The structure, used in the air curtain drag reduction method, includes several steel beams 1, with a base plate 101 connecting the bottoms of the steel beams 1. Several air nozzle mounting modules 2 are provided on both sides of the steel beams 1, and a connecting pipe 9 connects the air nozzle mounting modules 2 on both sides of the steel beams 1. Several air nozzle components 5 are provided on the air nozzle mounting modules 2, and the air nozzle components 5 are distributed on the sides, top, and bottom of the air nozzle mounting modules 2. The air nozzle components 5 are used to spray gas to form an air curtain. Holes for avoiding the air nozzle components 5 are opened on the top of the steel beams 1, and holes for avoiding the air nozzle components 5 are also opened on the bottom of the steel beams 1 and the base plate 101.

[0059] The air supply pipeline system is set between several air nozzle mounting modules 2 on one side of the steel beam 1. The air supply pipeline system includes several sets of air transmission pipelines, which are alternately set with the air nozzle mounting modules 2 on one side of the steel beam 1. Each set of air transmission pipelines consists of several air flow branch pipes 3. The number of air flow branch pipes 3 in each set of air transmission pipelines decreases sequentially along the jacking direction of the support structure. The ends of the air flow branch pipes 3 and the sides of the air nozzle mounting modules 2 are equipped with quick-release connectors, such as threaded connectors, which enable quick release through threaded connection. The air flow branch pipes 3 near the jacking direction are connected to the high-pressure air compressor. A miniature flow regulating valve is also installed on the air flow branch pipes 3. The air nozzle mounting modules 2 are hollow.

[0060] Furthermore, the nozzle component 5 is an air jet component, which includes a nozzle mounting base 6 that is threadedly connected to the nozzle mounting module 2. The nozzle mounting base 6 houses the nozzle body 7, one end of which extends out from the nozzle mounting base 6. A sealing ring 8 is also provided inside the nozzle mounting base 6. The nozzle 7 is made of hard alloy material, which is wear-resistant, corrosion-resistant, and reusable. The sealing gasket 8 is made of polytetrafluoroethylene material, which is high-temperature resistant and has good sealing performance. The nozzle mounting base 6 is machined with a hexagonal head for easy installation and disassembly.

[0061] Steel beam 1 is an I-beam, and the arrangement of the jetting components is as follows:

[0062] A row of jet nozzles is arranged every 60-80mm along the height direction of the steel beam 1 on the flange of the front end face of the steel beam 1, with a spacing of 100-120mm between each row of jet nozzles;

[0063] A row of jet nozzles is arranged every 80-100mm on the web of steel beam 1, with a spacing of 120-150mm between each row of jet nozzles.

[0064] A row of jet nozzles is arranged every 100-150mm on the flange of the side of steel beam 1, with a spacing of 100-120mm between each row of jet nozzles;

[0065] A row of jet nozzles is arranged every 150-200mm on the side of the web of steel beam 1, with a spacing of 120-150mm between each row of jet nozzles; it should be noted that the positional relationship between the jet nozzles and steel beam 1 is relative, and the jet nozzles are not directly installed on steel beam 1.

[0066] The diameter of the jet nozzle is 3-4 mm, and the jet nozzle is perpendicular to the surface of steel beam 1.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. An air curtain drag reduction and replacement method, characterized in that, include: S1. A replacement structure is used, and the replacement structure is equipped with jet components. The replacement structure is equipped with an air supply pipeline system, and the air supply pipeline system is connected to an air supply device. The air supply device supplies air to the jet components through the air supply pipeline system so as to form an air curtain by being ejected through the jet components. S2. Pre-construction preparations, including: S201. Fabrication and placement of the underpinning structure: The underpinning structure is hoisted to the predetermined position below the site, and the position of the underpinning structure is monitored in real time. S202. Monitoring of the site and surrounding environment: Before construction, conduct a detailed survey of the site, record the surface material, texture, and damage, and establish a high-precision three-dimensional model; reasonably arrange displacement monitoring points and vibration monitoring points around the site, install monitoring equipment, calibrate and debug it, and establish a real-time data acquisition system; S3. The replacement construction process includes: S301. Gradual Air Curtain Start-up and Fine-tuning: 10-15 minutes before the jacking of the support structure, start the high-pressure air compressor at 30%-50% of the normal operating pressure, slowly increase the gas pressure and flow rate, observe the formation of the air curtain and the site response, and dynamically fine-tune the air curtain pressure and flow rate based on real-time monitoring data; establish a dynamic threshold model, and flexibly adjust the threshold of micro-disturbance control according to the structural characteristics and geological conditions of different sites in order to protect the site; S302, Precision jacking and micro-disturbance control: The jacking and support structure is jacked using jacks; micro-deformation monitoring sensors are arranged on the support structure and the site to monitor minute deformations in real time. When the deformation exceeds the preset threshold, the jacking is paused, the cause is analyzed, and the jacks are finely adjusted through the servo control system. S303, Support and Vertical Dynamic Adjustment: After the horizontal advancement of the support structure is completed, gas pressure is simultaneously supplied to the bottom of the air curtain system during the vertical jacking process. During the vertical jacking construction, the vertical gas pressure of the air curtain system is dynamically adjusted according to the real-time monitored vertical displacement and deformation values ​​of the site building to ensure that the vertical deformation of the site building remains in a balanced and stable state under the dynamic adjustment of the air curtain system.

2. The air curtain drag reduction and replacement method according to claim 1, characterized in that, The jet components are made of hard alloy material and coated with an anti-corrosion coating.

3. The air curtain drag reduction and replacement method according to claim 1, characterized in that, A high-pressure air compressor is selected as the air supply equipment, with an exhaust volume that meets the gas flow requirements of all jet components and an exhaust pressure of 0.6-1.2MPa. It is also equipped with a high-precision air filter and dryer. During the installation of the air curtain system, the air tightness of the air curtain system is tested and adjusted to ensure that the gas flow of each jet component is uniform and a stable air curtain is formed.

4. The air curtain drag reduction and replacement method according to claim 3, characterized in that, The airtightness test uses gas at 1.5 times the normal working pressure and maintains it for 20 minutes. If the pressure drop does not exceed 0.05 MPa, it indicates good airtightness. Under complex geological conditions, the airtightness test standard is adjusted according to simulation analysis.

5. The air curtain drag reduction and replacement method according to claim 1, characterized in that, S202 also includes: developing an integrated monitoring and control system to collect, analyze and provide feedback on monitoring data in real time, and to adjust the air curtain pressure and jacking parameters through automated control.

6. The air curtain drag reduction and replacement method according to claim 1, characterized in that, In S303, the jacking speed of the support structure is precisely within ±1 mm / min, and the jacking force error is within ±5%.

7. The air curtain drag reduction and replacement method according to claim 1, characterized in that, Also includes: S4. Post-construction treatment; Post-construction treatment includes: S401. Remove the air curtain system: Remove the air supply pipeline system and unscrew the jet components; for components that are difficult to disassemble directly, use cutting technology to cut them into small pieces and remove them, use a small vacuum cleaner to collect the debris, and increase the protection measures for the surrounding environment during the cutting process. S402. Comprehensive assessment and long-term protection of the site: After construction is completed, a comprehensive assessment of the site will be conducted, and the impact will be judged by comparing the data before and after construction; for areas with potential damage, appropriate materials and technologies will be used for reinforcement, and a long-term monitoring system will be established; the long-term monitoring system will include monitoring and response measures for environmental factors.

8. A replacement structure, applied to the air curtain drag reduction replacement method according to any one of claims 2-8, characterized in that, It includes several steel beams (1), and a base plate (101) is connected between the bottoms of the several steel beams (1). Several air nozzle mounting modules (2) are provided on both sides of the steel beams (1), and a connecting pipe (9) is connected between the air nozzle mounting modules (2) on both sides of the steel beams (1). Several air nozzle components (5) are provided on the air nozzle mounting modules (2). The several air nozzle components (5) are distributed on the side, top and bottom of the air nozzle mounting modules (2). The air nozzle components (5) are used to spray gas to form an air curtain.

9. The replacement structure according to claim 8, characterized in that, The gas supply pipeline system is set between several gas nozzle installation modules (2) on one side of the steel beam (1). The gas supply pipeline system includes several sets of gas transmission pipelines. The several sets of gas transmission pipelines are alternately set between the several sets of gas transmission pipelines and the several gas nozzle installation modules (2) on one side of the steel beam (1). Each set of gas transmission pipelines consists of several air flow branch pipes (3). The number of air flow branch pipes (3) in each set of gas transmission pipelines decreases sequentially along the jacking direction of the support structure.

10. The replacement structure according to claim 9, characterized in that, The nozzle component (5) is an air jet component, which includes a nozzle mounting base (6) that is threadedly connected to the nozzle mounting module (2). A nozzle body (7) is provided inside the nozzle mounting base (6). One end of the nozzle body (7) extends out from the nozzle mounting base (6), and a sealing ring (8) is also provided inside the nozzle mounting base (6).

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