Construction method of long-distance ultra-low air leakage duct in confined space with irregular cavity wall

Abstract

The invention relates to the field of building construction technology, and discloses a method for constructing an air duct in a confined space in an irregular cave wall with a long distance and ultra-low air leakage, comprising the following steps: determining design and measurement; preparing a construction site; manufacturing and preparing the air duct; steps for installing the air duct; inspecting and testing; cleaning and completion; safety and monitoring; subsequent support and maintenance; when the air duct is very close to the tunnel top and there is no operating space on the top or the side, and welding on the outside of the air duct is impossible, the invention adopts a method of newly opening an operating hole (operating hole size 600x600mm) below the air duct, and welders enter the air duct through the operating hole, add a stainless steel plate strip along the inner circle of the flange (strip thickness 1.0mm, width 50mm), and then seal and weld on both sides of the strip; the problem that the conventional construction method cannot complete the construction work requirements due to the irregular tunnel wall and undulating slope, and there is not enough space for welding operation in some areas above the tunnel wall and the air duct is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for constructing a confined space air duct in an irregular cave wall with a long distance and ultra-low air leakage. Background Art

[0002] Installation of ultra-long-distance ventilation ducts in irregular natural tunnels with undulating tunnels and uneven tunnel walls. The air leakage of the ducts must meet the national standard GB "Ventilation and Air Conditioning Engineering Construction Quality Acceptance Code 50243-2016" which is 25% of the leakage of high-pressure ducts, as well as the E-level leakage in the "Ventilation Duct Technical Code JGJ20141-2017". The construction environment and requirements bring great challenges to the engineering construction.

[0003] The traditional operation method is to use angle steel flange connection in air duct construction, but it cannot meet the air leakage requirements of the project. Therefore, full welding connection is adopted. However, due to the irregularity of the tunnel wall and the undulating slope, there is not enough space for welding operations above the tunnel wall and the air duct in some areas. The conventional construction method cannot meet the construction requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a confined space air duct in an irregular cave wall with a long distance and ultra-low air leakage, thereby solving the problem in the background technology that there is insufficient space for welding operations in some areas above the cave wall and the air duct.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The method for constructing a long-distance ultra-low air leakage confined space air duct in an irregular cave wall includes the following steps:

[0007] S1. Determine the design and measurement: Ensure that the design drawings have been confirmed before construction, including the space limitations in the cave wall, the size of the duct and the layout requirements; use accurate measuring tools (such as laser rangefinders) to measure the actual space size and geometry in the cave wall;

[0008] S2. Prepare the construction site: clean up the debris and dust in the cave wall to ensure that the construction space is clean and barrier-free. Before construction, ensure that the construction workers have worn safety equipment and understand the emergency evacuation procedures;

[0009] S3. Duct manufacturing and preparation: According to the design requirements, manufacture and prepare the required duct components, ensure that they meet the size and shape requirements, and consider the protection measures for the duct during transportation and installation to prevent damage or deformation;

[0010] S4. Duct installation steps: Construction workers enter the cave wall and may need to use safety ropes and support systems to ensure safety. They adjust the position according to the specific situation, then connect the various components and finally fix them.

[0011] S5. Inspection and testing: After the construction is completed, each installed duct component is visually inspected to ensure that there is no obvious damage or incorrect installation, followed by a pressure test of the duct system to ensure that the system's sealing and working performance meet the design requirements;

[0012] S6. Cleaning and Completion: Clean up the construction site, remove all tools, materials and garbage, keep the construction site clean and tidy, record the key steps and test results during the construction process, and prepare a completion report and archive it for future reference;

[0013] S7. Safety and monitoring: Use real-time monitoring systems or video equipment to monitor the position and status of the duct during installation to identify and resolve potential problems in a timely manner;

[0014] S8. Subsequent support and maintenance: Establish a regular maintenance plan, including cleaning, lubrication and regular inspections to ensure the long-term stable operation of the duct system, and ensure that there is a professional technical support team to provide support and solve problems for system users at any time.

[0015] Preferably, determining the design and measurement in S1 also includes recording the measurement results in detail, including the measurement values ​​at various locations in the cave wall, to ensure accuracy.

[0016] Preferably, preparing the construction site in S2 also includes setting up appropriate entry points and work spaces to ensure that construction workers can safely enter and operate the air duct installation position in the cave wall, while ensuring that the construction site has good ventilation and adequate lighting, especially inside narrow or deep cave walls.

[0017] Preferably, the manufacturing and preparation of the wind pipe in S3 further comprises the following steps:

[0018] a. Air duct construction in areas with limited operating space;

[0019] b. Air duct construction in areas with operating space;

[0020] c. For areas with operating space and duct height exceeding 800mm.

[0021] Preferably, in step a, since the air duct is arranged above the steel structure in the tunnel, the air duct is very close to the tunnel top in many places, and there is no operating space on the top or side, and welding cannot be done on the outside of the air duct. Instead, a new operating hole is opened under the air duct (operating hole size 600x600mm), and the welding personnel enter the air duct through the operating hole, and add a stainless steel plate strip along the inner circle of the flange (strip thickness 1.0mm, width 50mm), and then seal and weld on both sides of the strip. After the strip welding is completed, the operating hole is sealed, and the sealing plate size is 700x700mm, and the sealing plate thickness is the same as the air duct body.

[0022] Preferably, in step b, the on-site air duct has not been completely connected or fixed, and the unfixed air duct can be moved forward and backward on the steel structure. Therefore, for areas with welding space on the top of the air duct, it is planned to move the original air duct forward and backward, and increase the short pipe and weld it to the air duct flanges at both ends according to the specific moving distance to achieve the purpose of full welding of the air duct.

[0023] Preferably, in step c, the sealing gasket is taken out after disassembling the original flange bolts, and then the air duct is moved to reduce the gap between the air ducts. After the adjustment is completed, the construction personnel enter the air duct, fill and weld the flange parts of the two sections of the air duct with welding wire, and at the same time ensure the ventilation inside the air duct. When entering, the personnel are equipped with life ropes and walkie-talkies to ensure their safety.

[0024] Preferably, the air duct installation step in S4 further includes the following steps:

[0025] a. Entering the cave wall: Construction workers can enter the cave wall by using safety ropes and support devices;

[0026] b. Adjust the position: according to the design and measurement data in S1, gradually push the duct components into the hole wall to ensure that the position and angle of each component are consistent with the design requirements;

[0027] c. Connecting parts: Use the prepared connectors to connect the duct parts, ensuring that the connection is firm and well sealed to prevent air leakage;

[0028] d. Fixing: As needed, use a special fixing fixture or support system to fix the duct components in the hole wall to prevent the duct from moving or vibrating during use;

[0029] e. Check alignment and clearance: Ensure that the alignment and clearance of each duct component after installation meet the design requirements, especially in irregular hole walls, which require special attention to adjustment;

[0030] f. Protection and marking: After completing the safety of each component, consider adding a protective layer or marking to protect the duct from potential damage or misoperation.

[0031] Preferably, the S5 inspection and testing further comprises the following steps:

[0032] a. Visual inspection: First, conduct a visual inspection to ensure that all duct components have been installed and connected in place according to the design requirements. Check for any obvious installation errors or defects;

[0033] b. Dimension measurement: Use appropriate measuring tools to measure the dimensions of the installed air duct. Ensure that the length, diameter and connection size of the air duct meet the design requirements;

[0034] c. Leakage test: Perform a leak test to check if there is air leakage at the duct connection. Common testing methods include using a pressure gauge or smoke tester to detect potential leaks.

[0035] d. Flow test: If necessary, conduct a flow test on the air duct. This usually involves installing a flow meter or using an anemometer to measure the air velocity in the air duct to ensure the normal operation of the system;

[0036] e. Pressure test: For certain specific requirements, it may be necessary to perform a pressure test on the air duct, which can help verify the pressure resistance and sealing performance of the system;

[0037] f. Functional test: Finally, the functional test of the air duct system is carried out to ensure that all control systems, adjustment components and equipment related to the air duct system can work normally;

[0038] g. Records and Reports: Record the results of all inspections and tests and generate detailed inspection reports that include any problems or defects found and necessary corrective actions.

[0039] Preferably, the S6 cleaning and finishing further comprises the following steps:

[0040] a. Clean up the work area: remove all tools, materials and garbage from the construction site, and ensure that the inside and outside of the cave wall are clean and tidy without any leftovers or obstacles;

[0041] b. Inspection and repair: Carry out a final inspection to ensure that all duct installation parts are intact, without missing connections or other problems. If any defects are found, repair them immediately;

[0042] c. Protective treatment: as needed, protective treatment shall be carried out on the installed air ducts, such as coating with anti-corrosion paint or adding protective sleeves, to extend their service life;

[0043] d. Clean up the surrounding environment: clean up and restore the environment around the construction site to ensure that there is no impact or pollution to surrounding buildings or landscapes;

[0044] e. Completion acceptance: Invite the relevant person in charge or the owner to conduct the final completion acceptance to ensure that they are satisfied with the results of the entire duct installation project and sign the final acceptance document;

[0045] f. Recording and filing: Archive all relevant documents, inspection reports and acceptance documents as completion records of the project and reference for future maintenance.

[0046] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0047] 1. The present invention adopts the operation method in step S3a. When the air duct is very close to the tunnel top and there is no operation space on the top or side, and welding cannot be performed on the outside of the air duct, an operation hole (operation hole size 600x600mm) is newly opened under the air duct. The welding personnel enter the air duct through the operation hole and add a stainless steel plate pressure strip along the inner circle of the flange (pressure strip thickness 1.0mm, width 50mm), and then seal and weld on both sides of the pressure strip. This solves the problem that due to the irregularity of the tunnel wall and the undulating slope, there is not enough space for welding operation in some areas above the tunnel wall and the air duct, and the conventional construction method cannot complete the construction work requirements;

[0048] 2. According to the operation method in step S3b of the present invention, if the on-site air duct has not been completely connected or fixed, the unfixed air duct can be moved forward and backward on the steel structure. Therefore, for the area with welding space on the top of the air duct, it is planned to move the original air duct forward and backward, and add short pipes and butt welding with the air duct flanges at both ends according to the specific moving distance to achieve the purpose of full welding of the air duct;

[0049] 3. The present invention adopts the operation method in step S3 c. For areas where there is operating space and the pipe height exceeds 800mm, it is intended to remove the original flange bolts and take out the sealing gasket, then move the air duct to reduce the gap between the air ducts. After the adjustment is completed, the construction personnel enter the air duct, fill and weld the flange parts of the two sections of the air duct with welding wire, and ensure ventilation inside the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of the newly added operation hole and its size below the air duct of the present invention;

[0051] Figure 2 This is a schematic diagram of the installation of a stainless steel air duct with an operating space according to the present invention;

[0052] Figure 3 It is an operation flow chart of the whole invention;

[0053] Figure 4 Flow chart for manufacturing and preparing the air duct of the present invention;

[0054] Figure 5 A flow chart of the air duct installation steps of the present invention;

[0055] Figure 6 Flowchart for inspection and testing of the present invention;

[0056] Figure 7 A flow chart for cleaning and completion of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0058] See also Figure 1 , Figure 2 and Figure 3 The method for constructing a long-distance ultra-low air leakage confined space air duct in an irregular cave wall includes the following steps:

[0059] Determine the design and measurement: Ensure that the design drawings have been confirmed before construction, including the space limitations in the cave wall, the size of the duct and the layout requirements; use accurate measurement tools (such as laser rangefinders) to measure the actual space size and geometry in the cave wall;

[0060] Prepare the construction site: clean up the debris and dust in the cave wall to ensure that the construction space is clean and barrier-free. Before construction, make sure that the construction workers have worn safety equipment and understand the emergency evacuation procedures;

[0061] Duct manufacturing and preparation: According to the design requirements, manufacture and prepare the required duct components, ensure that they meet the size and shape requirements, and consider the protection measures for the duct during transportation and installation to prevent damage or deformation;

[0062] Duct installation steps: Construction workers enter the cave wall and may need to use safety ropes and support systems to ensure safety, adjust the position according to the specific situation, then connect the various components and finally fix them;

[0063] Inspection and testing: After construction is completed, each installed duct component is visually inspected to ensure there is no obvious damage or incorrect installation, followed by a pressure test of the duct system to ensure that the system's tightness and working performance meet the design requirements;

[0064] Cleaning and Completion: Clean up the construction site, remove all tools, materials and garbage, keep the construction site tidy, record key steps and test results during the construction process, and prepare a completion report and archive it for future reference;

[0065] Safety and monitoring: Use real-time monitoring systems or video equipment to monitor the location and status of the duct during installation to identify and resolve potential problems in a timely manner;

[0066] Subsequent support and maintenance: Establish a regular maintenance plan, including cleaning, lubrication and regular inspections to ensure the long-term stable operation of the duct system, and ensure that there is a professional technical support team to provide support and solve problems for system users at any time

[0067] Determining the design and measurement also includes recording the measurement results in detail, including the measurement values ​​at various locations within the cave wall to ensure accuracy.

[0068] Preparing the construction site also includes setting up appropriate entry points and working spaces to ensure that construction personnel can safely enter and operate the duct installation locations in the cave wall, and ensuring that the construction site has good ventilation and adequate lighting, especially in narrow or deep cave walls.

[0069] See also Figure 4 , duct manufacturing and preparation also includes the following steps:

[0070] Air duct construction in areas with limited operating space;

[0071] Since the air duct is set above the steel structure in the tunnel, the air duct is very close to the tunnel top in many places, and there is no operating space on the top or side, and welding cannot be done on the outside of the air duct. A new operation hole is added under the air duct (operation hole size 600x600mm), and the welders enter the air duct through the operation hole and add a stainless steel plate strip along the inner circle of the flange (strip thickness 1.0mm, width 50mm), and then seal and weld on both sides of the strip. After the strip welding is completed, the operation hole is sealed. The sealing plate size is 700x700mm, and the sealing plate thickness is the same as the air duct body.

[0072] For air duct construction in areas with operating space;

[0073] The on-site air ducts have not been fully connected or fixed, and the unfixed air ducts can be moved forward and backward on the steel structure. Therefore, for areas with welding space on the top of the air duct, it is planned to move the original air duct forward and backward, and increase the short pipe and weld it to the air duct flanges at both ends according to the specific distance of the movement to achieve the purpose of full welding of the air duct.

[0074] For areas with operating space and duct height exceeding 800mm;

[0075] The sealing gasket is removed after dismantling the original flange bolts, and then the air duct is moved to reduce the gap between the air ducts. After the adjustment is completed, the construction personnel enter the air duct, fill and weld the flange parts of the two sections of the air duct with welding wire, and at the same time ensure the ventilation inside the air duct. When personnel enter, they are equipped with life ropes and walkie-talkies to ensure their safety.

[0076] See also Figure 5 , the duct installation steps also include the following steps:

[0077] Entering the cave wall: Construction workers enter the cave wall by using safety ropes and support devices;

[0078] Adjust the position: according to the design and measurement data, gradually push the duct components into the hole wall to ensure that the position and angle of each component are consistent with the design requirements;

[0079] Connecting parts: Use the prepared connectors to connect the duct parts, making sure the connection is firm and well sealed to prevent air leakage;

[0080] Fixing: As needed, use a special fixing fixture or support system to fix the duct components in the hole wall to prevent the duct from moving or vibrating during use;

[0081] Check alignment and clearance: Ensure that the alignment and clearance of each duct component after installation meet the design requirements, especially in irregular hole walls, which require special attention to adjustment;

[0082] Guarding and marking: After completing the safety of each component, consider adding guarding or marking to protect the duct from potential damage or mishandling.

[0083] See also Figure 6 , inspection and testing also includes the following steps:

[0084] Visual inspection: First, conduct a visual inspection to ensure that all duct components have been installed and connected in place according to design requirements. Check for any obvious installation errors or defects;

[0085] Dimension measurement: Use appropriate measuring tools to measure the dimensions of the installed air duct. Ensure that the length, diameter and connection size of the air duct meet the design requirements;

[0086] Leakage test: Perform a leak test to check if there is any air leakage at the duct connection. Common testing methods include using a pressure gauge or smoke tester to detect potential leaks;

[0087] Flow test: If necessary, conduct a flow test on the air duct. This usually involves installing a flow meter or using an anemometer to measure the air velocity in the duct to ensure the normal operation of the system;

[0088] Pressure test: For certain specific requirements, it may be necessary to perform a pressure test on the air duct, which can help verify the pressure resistance and sealing performance of the system;

[0089] Functional test: Finally, the functional test of the air duct system is carried out to ensure that all control systems, adjustment components and equipment related to the air duct system can work normally;

[0090] Records and Reports: Record the results of all inspections and tests and generate detailed inspection reports that include any problems or deficiencies found and any necessary corrective actions.

[0091] See also Figure 7 , cleaning and finishing also includes the following steps:

[0092] Clean up the work area: remove all tools, materials and garbage from the construction site, and ensure that the inside and outside of the hole are clean and tidy without any leftovers or obstacles;

[0093] Inspection and repair: Carry out a final inspection to ensure that all duct installation parts are intact, without missing connections or other problems. If any defects are found, repair them immediately;

[0094] Protective treatment: As needed, the installed air ducts shall be protected, such as by coating with anti-corrosion paint or adding protective sleeves, to extend their service life;

[0095] Clean up the surrounding environment: clean up and restore the environment around the construction site to ensure that there is no impact or pollution to surrounding buildings or landscapes;

[0096] Completion acceptance: Invite the relevant person in charge or the owner to conduct the final completion acceptance to ensure that they are satisfied with the results of the entire duct installation project and sign the final acceptance document;

[0097] Recording and filing: File all relevant documents, inspection reports and acceptance documents as a record of the project’s completion and a reference for future maintenance.

[0098] Although the 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 alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing air ducts in confined spaces in irregular cave walls with long distances and ultra-low air leakage, characterized in that: The following steps are involved: S1. Determine the design and measurement: Ensure that the design drawings have been confirmed before construction, including the space limitations in the cave wall, the size of the duct and the layout requirements; use accurate measuring tools to measure the actual space size and geometry in the cave wall; S2. Prepare the construction site: clean up the debris and dust in the cave wall to ensure that the construction space is clean and barrier-free. Before construction, ensure that the construction workers have worn safety equipment and understand the emergency evacuation procedures; S3. Duct manufacturing and preparation: According to the design requirements, manufacture and prepare the required duct components, ensure that they meet the size and shape requirements, and consider the protection measures for the duct during transportation and installation to prevent damage or deformation; S4. Duct installation steps: Construction workers enter the cave wall and may need to use safety ropes and support systems to ensure safety. They adjust the position according to the specific situation, then connect the various components and finally fix them. S5. Inspection and testing: After the construction is completed, each installed duct component is visually inspected to ensure that there is no obvious damage or incorrect installation, followed by a pressure test of the duct system to ensure that the system's sealing and working performance meet the design requirements; S6. Cleaning and Completion: Clean up the construction site, remove all tools, materials and garbage, keep the construction site clean and tidy, record the key steps and test results during the construction process, and prepare a completion report and archive it for future reference; S7. Safety and monitoring: Use real-time monitoring systems or video equipment to monitor the position and status of the duct during installation to identify and resolve potential problems in a timely manner; S8. Subsequent support and maintenance: Establish a regular maintenance plan, including cleaning, lubrication and regular inspections, to ensure the long-term stable operation of the duct system, and ensure that there is a professional technical support team to provide support and solve problems for system users at any time; The S3 stroke tube manufacturing and preparation also includes the following steps: a. Air duct construction in areas with limited operating space; b. Air duct construction in areas with operating space; c. For areas with operating space and duct height exceeding 800mm; In step a, since the air duct is set above the steel structure in the tunnel, the air duct is very close to the tunnel top in many places, and there is no operating space on the top or side, and welding cannot be done on the outside of the air duct. A new operation hole of 600x600mm is opened under the air duct. The welder enters the air duct through the operation hole and adds a stainless steel plate strip along the inner circle of the flange, 1x50mm, and then seals and welds on both sides of the strip. After the strip is welded, the operation hole is sealed and welded. The size of the sealing plate is 700x700mm, and the thickness of the sealing plate is the same as that of the air duct body. In step b, the on-site air duct has not been fully connected or fixed. The unfixed air duct can be moved forward and backward on the steel structure. Therefore, for the area with welding space on the top of the air duct, it is planned to move the original air duct forward and backward, and increase the short pipe and the air duct flanges at both ends according to the specific moving distance to achieve the purpose of full welding of the air duct. In the step c, the original flange bolts are disassembled and the sealing gasket is taken out, and then the air duct is moved to reduce the gap between the air ducts. After the adjustment is completed, the construction personnel enter the air duct, fill and weld the flange parts of the two sections of the air duct with welding wire, and at the same time ensure the ventilation inside the air duct. When the personnel enter, they are equipped with life ropes and walkie-talkies to ensure their safety.

2. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 1 is characterized in that: Determining the design and measurement in S1 also includes recording the measurement results in detail, including the measurement values ​​of various positions in the cave wall, to ensure accuracy.

3. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 1, characterized in that: The preparation of the construction site in S2 also includes setting up appropriate entry points and working spaces to ensure that construction workers can safely enter and operate the air ducts in the cave wall.

4. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 3 is characterized in that: The duct installation process also includes ensuring good ventilation and adequate lighting at the construction site in narrow or deep cave walls.

5. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 1, characterized in that: The air duct installation step in S4 also includes the following steps: a. Entering the cave wall: Construction workers can enter the cave wall by using safety ropes and support devices; b. Adjust the position: according to the design and measurement data in S1, gradually push the duct components into the hole wall to ensure that the position and angle of each component are consistent with the design requirements; c. Connecting parts: Use pre-prepared connectors to connect the duct parts, ensuring that the connection is firm and well sealed to prevent air leakage; d. Fixing: Use a fixing fixture or support system to fix the duct components in the hole wall to prevent the duct from moving or vibrating during use; e. Check alignment and clearance: Ensure that the alignment and clearance of each duct component after installation meet the design requirements; f. Protection and marking: After completing the safety of each component, consider adding a protective layer or marking to protect the duct from potential damage or misoperation.

6. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 1, characterized in that: The S5 inspection and testing also includes the following steps: a. Visual inspection: First, conduct a visual inspection to ensure that all duct components have been installed and connected in place according to the design requirements, and check for any obvious installation errors or defects; b. Dimension measurement: Use measuring tools to measure the dimensions of the installed air duct to ensure that the length, diameter and connection size of the air duct meet the design requirements; c. Leakage test: Perform a leak test to check if there is air leakage at the duct connection. Use a pressure gauge or smoke tester to detect potential leaks. d. Functional test: Finally, the functional test of the air duct system is carried out to ensure that all control systems, adjustment components and equipment related to the air duct system can work normally; e. Records and Reports: Record the results of all inspections and tests and generate detailed inspection reports including any problems or defects found and corrective actions.

7. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 6, characterized in that: The inspection and testing also includes flow testing: performing flow testing on the air duct, installing a flow meter or using an anemometer to measure the air flow rate in the air duct to ensure the normal operation of the system.

8. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 6, characterized in that: The inspection and testing also includes pressure testing: performing pressure testing on the air duct to help verify the pressure resistance and sealing of the system.

9. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 1, characterized in that: The S6 cleaning and finishing also includes the following steps: a. Clean up the work area: remove all tools, materials and garbage from the construction site, and ensure that the inside and outside of the cave wall are clean and tidy without any leftovers or obstacles; b. Inspection and repair: Carry out a final inspection to ensure that all duct installation parts are intact and not missing; c. Cleaning the surrounding environment: Clean and restore the environment around the construction site to ensure that there is no impact or pollution to surrounding buildings or landscapes; d. Completion acceptance: Invite the relevant person in charge or the owner to conduct the final completion acceptance to ensure that they are satisfied with the results of the entire duct installation project and sign the final acceptance document; e. Recording and filing: Archive all relevant documents, inspection reports and acceptance documents as completion records of the project and reference for future maintenance.

10. The method for constructing a long-distance, ultra-low air leakage air duct in a confined space in an irregular cave wall according to claim 9, characterized in that: The S6 cleaning and finishing also includes protective treatment: protective treatment is performed on the installed air duct to extend its service life.

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