A method for installing air duct in a narrow pipe well

Abstract

The present invention provides a method for installing narrow pipe shaft air ducts. The galvanized steel plate adopts a steel keel to cover and install the fixed structural wall. Rubber and plastic insulation is used between the galvanized plate and the structure to achieve complete separation of the air shaft structure and the galvanized steel plate and no air leakage. The specific construction is as follows: the pipe shaft adopts 5# channel steel as a fixed keel in the vertical direction, which surrounds the four sides of the air shaft. A 3# angle steel is set along the inner wall of the air shaft at intervals of 1250mm in the horizontal direction. The vertical 5# channel steel is fully covered with rubber and plastic insulation material. Before installing the galvanized steel plate, a 3mm thick rubber pad needs to be pasted on the surface of the channel steel keel. The galvanized steel plate is fixed to the channel steel keel with self-tapping screws, and the connection surface of the galvanized steel plate is pasted with sealant, and overlapped in the wind. The vertical joints at the four inner corners of the air shaft structure are sealed with angle steel. The present invention adopts a super-high-rise narrow pipe shaft keel covering air duct installation construction method to ensure the convenience, safety and stability of the pipe shaft air duct installation of super-high-rise buildings.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe well air duct installation, and in particular to a method for installing a narrow pipe well air duct. Background Art

[0002] Duct installation is an important part of the ventilation and air conditioning engineering wind system. Its construction quality directly affects the project progress and acceptance effect. At present, for the pipe shafts of super high-rise buildings.

[0003] However, during the installation and construction of insulated pipes in super-high-rise air shafts, especially during the installation of air ducts in narrow pipe shafts, there are still a series of problems such as the inability to transport large pipes horizontally and vertically, the lack of construction work platforms, high safety risks, and the lack of construction operation space to solve the pipeline problems. Summary of the Invention

[0004] To this end, the present invention proposes a narrow pipe shaft air duct installation method, which adopts a super high-rise narrow pipe shaft keel covering air duct installation construction method to ensure the convenience, safety and stability of the pipe shaft air duct installation of super high-rise buildings.

[0005] A method for installing a narrow pipe shaft air duct comprises the following steps:

[0006] (1) Construction preparation:

[0007] Before construction, confirm whether the two ventilation shafts can be constructed, confirm that there are no protruding residual concrete blocks and residual steel bars on the inner surface of the ventilation shaft, and ensure that the inner surface is flat;

[0008] (2) Duct cutting:

[0009] According to the on-site floor height, transportation route, and operability in the air shaft, and the overlap between the galvanized steel sheets, determine the size of the galvanized steel sheets on the short side of the exhaust shaft, as well as the size of the galvanized steel sheets on the short side of the fresh air shaft. When cutting, pay attention to the flatness of the surface of the galvanized steel sheets and the straightness of the edges. After cutting, the galvanized steel sheets must be reinforced and the edges of the galvanized steel sheets must be checked for burrs, and trimming is required.

[0010] (3) Keel installation:

[0011] A hanging basket was used for construction. 5# channel steel was selected as the fixed keel made of galvanized steel plates spliced ​​vertically. It was surrounded on all four sides of the air shaft. 3# angle steel was installed along the inner wall of the air shaft at preset intervals in the horizontal direction. The angle steel and the vertical channel steel were reliably welded. 3# angle steel was used to seal and reinforce the inner corners of the air shaft structure. In addition, the vertical 5# channel steel was reinforced again at the structural ring beam of each floor to ensure the integrity and stability of the keel.

[0012] (4) Heat preservation installation:

[0013] After the galvanized steel plate is cut, use rubber-plastic glue to stick the insulation material on the galvanized steel plate before installation. Before installing the galvanized steel plate, apply glue to the inner wall of the vertical 5# channel steel and cover it with rubber-plastic insulation material to ensure the insulation effect.

[0014] (5) Galvanized steel plate installation:

[0015] Before installing the galvanized steel plate, a rubber pad of the first thickness must be pasted on the surface of the channel steel keel, and the galvanized steel plate must be fixed to the channel steel keel with self-tapping screws. Sealant is pasted on the connection surface of the galvanized steel plate, and overlap is adopted along the wind. Flat iron is used to seal the vertical joints. The vertical joints at the four inner corners of the air shaft structure are sealed with angle steel. When installing the air ducts of the fresh air shaft and exhaust shaft, thick rubber pads of the second thickness are pasted between the steel plates, and dovetail wires are used to fix the steel plates and between the steel plates and the channel steel and angle steel.

[0016] The above-mentioned narrow pipe shaft air duct installation method, wherein, in step (2), the size of the galvanized steel plate on the short side of the exhaust shaft is determined to be 1350mm*1250mm / piece, and the long side is determined to be 1300mm*1250mm / piece, and the size of the galvanized steel plate on the short side of the fresh air shaft is determined to be 1600mm*1250mm / piece, and the long side is determined to be 1300mm*1250mm / piece.

[0017] In the above-mentioned narrow pipe shaft air duct installation method, in step (2), attention is paid to the flatness of the surface of the galvanized steel plate and the straightness of the edges when cutting the material, ensuring that the deviation is ≤0.2mm.

[0018] In the above-mentioned narrow pipe shaft air duct installation method, in step (3), the preset distance is 1250 mm.

[0019] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), a flame-retardant Class B rubber-plastic-aluminum foil composite insulation material with a thickness of 50 mm is filled between the air shaft structure and the galvanized steel plate.

[0020] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), the first thickness is 3 mm.

[0021] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), sealant is pasted on the connecting surface of the galvanized steel plate, and a downwind overlap is adopted with an overlap length of 2 cm.

[0022] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), the size of the flat iron is 30mm*3mm.

[0023] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), the vertical joints at the four inner corners of the air shaft structure are sealed with ∠3*30 angle steel.

[0024] In the above-mentioned narrow pipe shaft air duct installation method, in step (4), the second thickness is 3 mm.

[0025] The present invention provides a method for installing narrow pipe shaft air ducts. The galvanized steel plate is installed on the fixed structural wall in a covering manner using a steel keel. Rubber and plastic insulation is used between the galvanized plate and the structure to achieve complete separation of the air shaft structure and the galvanized steel plate and the absence of air leakage. The specific construction is as follows: the pipe shaft uses 5# channel steel as a fixed keel in the vertical direction, which surrounds the four sides of the air shaft. A 3# angle steel is set along the inner wall of the air shaft at intervals of 1250mm in the horizontal direction, and the vertical 5# channel steel is fully covered with rubber and plastic insulation material. Before installing the galvanized steel plate, a 3mm thick rubber pad must be pasted on the surface of the channel steel keel (to prevent static electricity and cold wave reactions). Use self-tapping screws to fix the galvanized steel plate on the channel steel keel, and paste sealant on the connection surface of the galvanized steel plate, using a downwind overlap (overlap length 2cm). The vertical joints at the four inner corners of the air shaft structure are sealed with ∠3*30 angle steel. This method for installing narrow pipe shaft air ducts has the following beneficial effects:

[0026] (1) The present invention changes the conventional flange-type air duct installation to a keel-covered air duct installation, solving the problem that large air ducts cannot be installed in pipe wells;

[0027] (2) In the present invention, the air duct is cut into modular standardized materials, and the large air duct is decomposed into modules, which solves the problem that the large air duct cannot be transported;

[0028] (3) The present invention improves the insulation construction. The rubber and plastic insulation is first bonded and then installed, which solves the problem of no insulation construction surface between the air duct and the structure;

[0029] (4) The present invention adopts the covering installation construction of the air duct and adopts the hanging basket operation construction, which solves the problem of lack of construction space in ultra-high-rise narrow pipe shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the embodiments of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 This is a schematic diagram of the keel installation. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to various embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The existing narrow pipe shaft air duct installation method has the following construction difficulties:

[0035] 1. Insufficient construction space: The narrow, deep, and high construction area made material handling difficult and posed significant safety risks. The new and exhaust shafts had structural dimensions of 3900mm*1700mm and 3900mm*1450mm, respectively, while the designed ductwork dimensions were 3800mm*1600mm and 3800mm*1350mm, respectively. The exterior was insulated with 50mm-thick, flame-retardant, Class B rubber-plastic composite insulation. The transport elevator required a length of 3m*1.5m*2.5m. Under these construction conditions, the oversized ductwork could not be transported horizontally. Even if a truck were to transport a single section of duct to the site, a box elevator would not be able to transport it vertically. Furthermore, three sides of the shaft were structural, leaving only one long side as a construction surface. The distance between the duct on one side and the structural surface was only 50mm, making construction impossible on site.

[0036] 2. The civil structure of the pipe well is uneven, and the verticality and squareness of the corners cannot meet the standard construction of the keel. The entire pipe well keel needs to be repositioned to ensure the overall stability of the keel.

[0037] 3. When installing covering panels, they need to be overlapped along the wind according to the direction of airflow to avoid affecting the air volume.

[0038] 4. The height of the pipe well and the elevation of the branch pipes on each floor must be consistent with the decoration elevation of each floor to ensure accurate reservation of the branch pipes.

[0039] 5. The installation and construction process of the covered air duct is overlapped, and it is necessary to carry out flow module division operation, and the control of process connection is relatively strict.

[0040] To address the above difficulties, an embodiment of the present invention provides a method for installing a narrow shaft air duct, comprising the following steps:

[0041] (1) Construction preparation:

[0042] Before construction begins, confirm with the general contractor whether the two ventilation shafts can be constructed, confirm that there are no construction processes required by the general contractor for civil engineering, and confirm that there are no protruding residual concrete blocks or rebar on the inner surface of the ventilation shafts, ensuring that the inner surface is flat. Before construction begins, detailed technical instructions should be provided to construction personnel, covering both technical and safety aspects. All necessary materials and tools should be fully prepared, and safety precautions should be implemented.

[0043] (2) Duct cutting:

[0044] Based on the on-site floor height, transportation routes, and operability within the air shaft, and taking into account the overlap between galvanized steel sheets, the short-side galvanized steel sheets for the exhaust shaft are determined to be 1350mm*1250mm per piece, and the long-side galvanized steel sheets are determined to be 1300mm*1250mm per piece. The short-side galvanized steel sheets for the fresh air shaft are determined to be 1600mm*1250mm per piece, and the long-side galvanized steel sheets are determined to be 1300mm*1250mm per piece. When cutting the sheets, attention must be paid to the flatness of the galvanized steel sheet surface and the straightness of the edges (deviation ≤0.2mm). After cutting, the galvanized steel sheets must be reinforced. The edges of the galvanized steel sheets must be inspected for burrs and trimmed.

[0045] (3) Keel installation:

[0046] See also Figure 1 Construction was carried out using a hanging basket. 5# channel steel was used as the fixed keel, constructed from vertically spliced ​​galvanized steel sheets. This keel was wrapped around the four sides of the ventilation shaft. 3# angle steel was installed horizontally every 1250mm along the shaft's inner wall, securely welded to the vertical channel steel. 3# angle steel was used to seal and reinforce the inner corners of the ventilation shaft structure. Furthermore, vertical 5# channel steel was reinforced at the structural ring beams on each floor to ensure the integrity and stability of the keel.

[0047] (4) Heat preservation installation:

[0048] After the galvanized steel sheet is cut and installed, the insulation material is affixed to the galvanized steel sheet using a specialized rubber-plastic adhesive. Because the 5# channel steel is 50mm wide, a 50mm thick, flame-retardant, Class B rubber-plastic-aluminum foil composite insulation material is used to ensure a tight seal between the ventilation shaft structure and the galvanized steel sheet. Before installing the galvanized steel sheet, a layer of glue is applied to the inner wall of the vertical 5# channel steel, fully covering the interior with rubber-plastic insulation to ensure effective insulation.

[0049] (5) Galvanized steel plate installation:

[0050] Before installing the galvanized steel plate, a 3mm thick rubber pad must be pasted on the surface of the channel steel keel (to prevent static electricity and cold wave reaction). Use self-tapping screws to fix the galvanized steel plate to the channel steel keel. Paste sealant on the connection surface of the galvanized steel plate, and use wind overlap (lap length 2cm). For vertical joints, use 30mm*3mm flat iron (pressure strip) to seal (self-tapping screws must be fixed with two plates staggered, and cannot be fixed on only one side of the plate). The vertical joints at the four inner corners of the air shaft structure are sealed with ∠3*30 angle steel. When installing the fresh air shaft and exhaust shaft air ducts, paste 3mm thick rubber pads between the steel plates, and the steel plates and the steel plates and channel steel and angle steel must be fixed with dovetail wire.

[0051] Application Examples

[0052] The Sanyang Road Wind Tower Development Project (Phase I), supporting a comprehensive development project for Metro Line 7, has a total construction area of ​​116,514 square meters and a total height of 197.3 meters. The basement houses a garage, refrigeration room, boiler room, pump room, and power distribution center. The second underground floor houses subway equipment rooms and ventilation ducts. A dual-purpose wind tower for both the cross-river subway tunnel and highway tunnel is housed within the building's core. Floors 1 to 46 above ground are offices and auxiliary spaces.

[0053] According to the above-mentioned narrow pipe shaft air duct installation method, it was applied in the fresh air shaft and exhaust shaft of the tower, and a total of 4343.87 square meters of air duct installation was completed, the work efficiency was greatly improved, the new exhaust shaft met the design and specification requirements, and the construction quality passed the acceptance smoothly at one time.

[0054] The innovation benefits are detailed in Table 1 below:

[0055] Table 1

[0056]

[0057] Labor cost savings: Nearly one-fifth of the labor cost is saved. According to the original design, normal construction required 25 workers for 100 square meters. With this invention, the installation is done by switching from oversized ductwork to overlapping panels, requiring only five workers (two in the hanging basket, two for insulation, and one for labor). The labor cost is 300 yuan / day, and the total ductwork area is 4,343.87 square meters. The labor cost savings is: 4,343.87 / 100 * (25 - 5) * 300 = 260,632.2 yuan.

[0058] Total cost: 578453.42 + 260632.2 = 839085.63 yuan

[0059] It is estimated that the benefits will increase by 800,000 after promotion, and this new technology will greatly speed up the construction progress and reduce the construction and installation risks.

[0060] The method provided by the present invention perfectly solves a series of problems encountered during the installation and construction of insulated pipes in super-high-rise ventilation shafts, such as the inability to transport large pipes horizontally and vertically, the lack of a construction platform, the high safety risks, and the lack of space for pipe construction. The method provided by the present invention effectively ensures construction safety and the normal transportation of materials. This results in the super-high-rise ventilation shaft ducts being completed in one go, with a feasible installation process, safe and convenient installation conditions, and quality standards. The overall duct appearance is beautiful and vertical, and the duct construction meets acceptance requirements.

[0061] In summary, the narrow pipe shaft air duct installation method provided by the present invention has the following beneficial effects:

[0062] (1) The present invention changes the conventional flange-type air duct installation to a keel-covered air duct installation, solving the problem that large air ducts cannot be installed in pipe wells;

[0063] (2) In the present invention, the air duct is cut into modular standardized materials, and the large air duct is decomposed into modules, which solves the problem that the large air duct cannot be transported;

[0064] (3) The present invention improves the insulation construction. The rubber and plastic insulation is first bonded and then installed, which solves the problem of no insulation construction surface between the air duct and the structure;

[0065] (4) The present invention adopts the covering installation construction of the air duct and adopts the hanging basket operation construction, which solves the problem of lack of construction space in ultra-high-rise narrow pipe shafts.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for installing a narrow pipe shaft air duct, characterized in that: The following steps are involved: (1) Construction preparation: Before construction, confirm whether the two ventilation shafts can be constructed, confirm that there are no protruding residual concrete blocks and residual steel bars on the inner surface of the ventilation shaft, and ensure that the inner surface is flat; (2) Duct cutting: According to the on-site floor height, transportation route, and operability in the air shaft, and the overlap between the galvanized steel sheets, determine the size of the galvanized steel sheets on the short side of the exhaust shaft, as well as the size of the galvanized steel sheets on the short side of the fresh air shaft. When cutting, pay attention to the flatness of the surface of the galvanized steel sheets and the straightness of the edges. After cutting, the galvanized steel sheets must be reinforced and the edges of the galvanized steel sheets must be checked for burrs, and trimming is required. (3) Keel installation: A hanging basket was used for construction. 5# channel steel was selected as the fixed keel made of galvanized steel plates spliced ​​vertically. It was surrounded on all four sides of the air shaft. 3# angle steel was installed along the inner wall of the air shaft at preset intervals in the horizontal direction. The angle steel and the vertical channel steel were reliably welded. 3# angle steel was used to seal and reinforce the inner corners of the air shaft structure. In addition, the vertical 5# channel steel was reinforced again at the structural ring beam of each floor to ensure the integrity and stability of the keel. (4) Heat preservation installation: After the galvanized steel plate is cut, use rubber-plastic glue to stick the insulation material on the galvanized steel plate before installation. Before installing the galvanized steel plate, apply glue to the inner wall of the vertical 5# channel steel and cover it with rubber-plastic insulation material to ensure the insulation effect. (5) Galvanized steel plate installation: Before installing the galvanized steel plate, a rubber pad of the first thickness must be pasted on the surface of the channel steel keel, and the galvanized steel plate must be fixed to the channel steel keel with self-tapping screws. Sealant is pasted on the connection surface of the galvanized steel plate, and overlap is adopted along the wind. Flat iron is used to seal the vertical joints. The vertical joints at the four inner corners of the air shaft structure are sealed with angle steel. When installing the air ducts of the fresh air shaft and exhaust shaft, thick rubber pads of the second thickness are pasted between the steel plates, and dovetail wires are used to fix the steel plates and between the steel plates and the channel steel and angle steel.

2. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (2), the size of the galvanized steel plate on the short side of the exhaust shaft is determined to be 1350mm*1250mm / piece, and the long side is determined to be 1300mm*1250mm / piece. The size of the galvanized steel plate on the short side of the fresh air shaft is determined to be 1600mm*1250mm / piece, and the long side is determined to be 1300mm*1250mm / piece.

3. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (2), pay attention to the flatness of the surface and straightness of the edges of the galvanized steel sheet when cutting, and ensure that the deviation is ≤0.2mm.

4. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (3), the preset distance is 1250 mm.

5. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), a flame-retardant Class B rubber-plastic-aluminum foil composite insulation material with a thickness of 50 mm is filled between the air shaft structure and the galvanized steel plate.

6. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), the first thickness is 3 mm.

7. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), sealant is applied to the connection surfaces of the galvanized steel plates, and a downwind overlap is used with an overlap length of 2 cm.

8. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), the size of the flat iron is 30mm*3mm.

9. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), the vertical joints at the four inner corners of the air shaft structure are sealed with ∠3*30 angle steel.

10. The narrow pipe shaft air duct installation method according to claim 1, characterized in that: In step (4), the second thickness is 3 mm.

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