A modular installation method for high-altitude ventilation ducts in exhibition halls

Abstract

The present invention provides a modular installation method for high-altitude ventilation ducts in exhibition halls, belonging to the technical field of ventilation duct installation. The modular installation method for high-altitude ventilation ducts in exhibition halls includes the following steps: arranging ventilation ducts on the top of the exhibition hall building model to establish a ventilation duct model; performing modular decomposition on the ventilation duct model to determine the positions of ventilation openings and ventilation duct modules; lofting and positioning to review the installation positions of the ventilation duct modules; opening ventilation openings on the top of the exhibition hall and installing ventilation connectors; fabricating ventilation ducts in sections and assembling them into ventilation duct installation modules; laying rubber shock pads, hoisting and installing the ventilation duct modules, and connecting them to the ventilation connectors; performing anti-rust treatment and heat preservation treatment on the surface of the ventilation ducts and the connection parts with the ventilation connectors, and arranging reinforcement members at equal intervals on the surface of the ventilation ducts; welding and fixing the reinforcement members to the top surface of the exhibition hall building; The present invention is beneficial to solving the vibration problem and noise problem after the installation of ventilation ducts.

Description

Technical Field

[0001] The present invention belongs to the technical field of installation of ventilation ducts, and more specifically, relates to a modular installation method for high-altitude ventilation ducts in exhibition halls. Background Art

[0002] Chinese Patent (Publication No.: CN111779229B, Application No.: CN202010721947.7) proposes a construction and installation method for large ventilation ducts, which uses a combined platform for installation. The steps are as follows: Place the combined platform on the ground directly below the installation position of the air duct; Place the short section of the air duct on the assembly platform for butt joint connection to form an air duct hoisting unit; Use a chain block for lifting, lift the hoisting platform away from the assembly platform, and lift the air duct hoisting unit to the installation position; While lifting, move the assembly platform to directly below the installation position of the next air duct hoisting unit; Use a spider lift for high-altitude operation to complete the fixation of the air duct hoisting unit; Then lower the chain block and move it to directly below the installation position of the next air duct hoisting unit, and sleeve it on the assembly platform; Move the chain block to the roof at the next installation position; Repeat the above steps until the installation of the ventilation duct is completed. Since the vibration generated during the operation of the fan will be transmitted to the room through the air duct, and furthermore, due to the friction between the air flow and the air duct wall during the air flow process, the vibration of the air duct, the vortex vibration generated by the friction of the air inside the air duct, the vibration between the air ducts, and the vibration caused by the imbalance between the internal and external pressures will all cause noise problems in the ventilation duct. The above invention cannot solve the vibration problem and noise problem after the installation of the ventilation duct. Summary of the Invention

[0003] In view of this, the present invention proposes a modular installation method for high-altitude ventilation ducts in exhibition halls, which can solve the vibration problem and noise problem after the installation of the ventilation duct.

[0004] The present invention is implemented as follows:

[0005] The present invention provides a modular installation method for high-altitude ventilation ducts in exhibition halls, which includes the following steps:

[0006] S10: Model the exhibition hall building, set ventilation openings and arrange ventilation ducts on the outer side of the top of the exhibition hall building in combination with the design requirements, and establish a ventilation duct model;

[0007] S20: Combine the orientation of the ventilation duct and the selected sheet material specifications to modularly decompose the ventilation duct model, and determine the opening position of each ventilation opening and the installation position of the ventilation duct module;

[0008] S30: Lay out and position the on-site situation of the exhibition hall building, and conduct a review measurement on the installation position of each ventilation duct module;

[0009] S40: Open the ventilation opening at the top of the exhibition hall, and install a ventilation joint made of autoclaved aerated concrete blocks inside the ventilation opening;

[0010] S50: Fabricate the ventilation duct in sections at the processing site and transport it to the construction site for assembly to form the ventilation duct installation module;

[0011] S60: Lay a rubber shock isolation pad at the installation position of the ventilation duct module, use a hydraulic lift to hoist and install the ventilation duct installation module above the rubber shock isolation pad, and connect it to the ventilation joint;

[0012] S70: Perform anti-rust treatment and heat preservation treatment on the surface of the ventilation duct and the connection with the ventilation joint, and arrange reinforcement members at equal intervals on the surface of the ventilation duct;

[0013] S80: Weld and fix the reinforcement member to the top surface outside the exhibition hall building.

[0014] The technical effects of a modular installation method for high-altitude ventilation ducts in an exhibition hall provided by the present invention are as follows: This modular installation method for high-altitude ventilation ducts in an exhibition hall is beneficial for early collision inspection and optimization of the pipeline layout effect by establishing a ventilation duct model; through modular decomposition of the ventilation duct, modular prefabrication and production of the ventilation duct in the factory can be realized, improving the material utilization rate, solving the problem of site restrictions, and being able to speed up the construction progress; by arranging the ventilation duct on the outer top of the exhibition hall building and using the ventilation opening to supply air indoors, the noise pollution caused by vibration during the air supply process of the ventilation duct can be significantly reduced, and at the same time, the problem of the loosening of the supports and hangers of the ventilation duct due to vibration, resulting in the ventilation duct being not firmly fixed inside the roof, is also solved; by setting a rubber shock isolation pad at the bottom of the ventilation duct, the rubber shock isolation pad has the characteristics of large vertical bearing capacity, light weight, good weather resistance, convenient installation, and low cost, and can effectively reduce the vibration effect generated during the air supply of the ventilation duct; by installing a ventilation joint made of autoclaved aerated concrete blocks at the ventilation opening, and utilizing the adsorption ability of autoclaved aerated concrete blocks for toxic and harmful substances such as formaldehyde, benzene, and ammonia, a certain antibacterial and sterilization effect can be produced on the air flowing through the ventilation opening.

[0015] On the basis of the above technical solutions, a modular installation method for high-altitude ventilation ducts in an exhibition hall of the present invention can also be improved as follows:

[0016] Among them, the manufacturing method of the ventilation joint is as follows:

[0017] The first step: Mix the basic materials, solid dry materials, foaming materials, adsorption materials and water and stir evenly to form a mixed material;

[0018] Step 2: Apply oil to brush the inner wall of the block mold once, inject the mixed material into the block mold, cover the surface with a film, maintain the temperature at 85±5°C, and let it stand for pre-curing for 85 - 100 min to obtain a block blank;

[0019] Step 3: Train the block blank shrinkage model, and input the designed size of the ventilation joint to obtain the cutting size of the block blank;

[0020] Step 4: Demold the block blank, cut and form it according to the cutting size of the block blank, and transfer it to an autoclave for autoclave curing to obtain the ventilation joint.

[0021] The step of injecting the mixed material into the block mold is specifically as follows: Vertically arrange multiple pre-stretched elastic fiber lines in the block mold, and then lay the mixed material layer by layer into the block mold so that the mixed material pours the elastic fiber lines inside; among them, both the fiber and the elastic fiber line are made of polyamide-66 material, and its melting point is greater than 200°C.

[0022] The designed size of the ventilation joint is adapted to the size of the ventilation opening and the size of the ventilation duct, and is equal to the formed size of the block blank after autoclave curing.

[0023] By adding fibers to the mixed material, when the mixed material is laid, the fibers are flattened and horizontally distributed, and then combined with the vertical arrangement of the elastic fiber lines, so that the block is affected in both the horizontal and vertical directions, reducing and minimizing the cracks on the surface of the finished ventilation joint. By setting the ventilation joint as an integral molding, its use performance is better than that of the ventilation joint formed by masonry, and the defect situation caused by masonry construction can be avoided.

[0024] Further, the step of training the block blank shrinkage model and inputting the designed size of the ventilation joint to obtain the cutting size of the block blank specifically includes the following steps:

[0025] Step 1: Manufacture block blanks of different sizes, and record the external dimensions of the block blanks as data set one; after autoclave curing the block blanks of different sizes, record the external dimensions of the block blanks after autoclave curing as data set two;

[0026] Step 2: Establish a neural network model, use data set two as the training input data and data set one as the training output data to train the neural network model to obtain the block blank shrinkage model;

[0027] Step 3: Input the designed size of the ventilation joint as the new data set two into the block blank shrinkage model for calculation to obtain the new data set one, and the new data set one is the cutting size of the block blank.

[0028] Among them, the external dimensions include the length, width and height of the block blank. When there are holes in the block blank, the external dimensions also include the shape dimensions of the holes; the block blanks of different sizes in the above steps include those with external dimension values greater than the external dimensions of the ventilation joint in the present invention and those with external dimension values less than the external dimensions of the ventilation joint in the present invention.

[0029] During autoclave curing, the block blank will go through a heating-up stage, a constant-temperature stage and a cooling-down stage. Due to the action of temperature and pressure, the external dimensions of the block blank will change non-linearly before and after autoclave curing. Therefore, the finished block blank often needs to be processed twice after autoclave curing, which may damage its internal structure and lead to performance degradation. In order to avoid damage to the finished block blank caused by secondary processing, when cutting the block blank before autoclave curing, a margin needs to be reserved. Through the shrinkage model of the block blank, based on the design dimensions of the ventilation joint, the cutting dimensions of the block blank before autoclave curing can be predicted, which is beneficial to realizing the integral molding of the ventilation joint and avoiding damage to the finished block blank caused by secondary processing during autoclave curing.

[0030] Furthermore, the basic materials include the following raw materials: lime, cement, fiber, sand, gypsum, ceramic waste residue, fly ash; the solid dry materials include the following raw materials: water-retaining agent, mint, senecio, tea leaves, dried ginger; the foaming materials include the following raw materials: foaming agent, foam stabilizer; the adsorption materials include the following raw materials: formaldehyde purification adsorbent, tea leaves and fiber.

[0031] The beneficial effects of adopting the above improvement scheme are as follows: Mint leaves, senecio, tea leaves and dried ginger all have good bactericidal and antibacterial effects, which can make the obtained ventilation joint have good bactericidal and antibacterial effects, so that the surface of the ventilation opening is not easy to grow mildew in a humid environment.

[0032] Furthermore, the weight parts of each component in the solid dry materials are respectively: 0.5 - 0.7 parts of water-retaining agent, 7 - 9 parts of mint, 7 - 9 parts of senecio, 5 - 6 parts of tea leaves, 5 - 7 parts of dried ginger; the weight parts of each component in the adsorption materials are respectively: 26 - 41 parts of formaldehyde purification adsorbent, 5 - 10 parts of tea leaves, 3 - 4 parts of fiber.

[0033] Furthermore, the steps of autoclave curing are specifically as follows: First, evacuate to a pressure of 0.06 MPa, then introduce steam to increase the pressure for 2.5 h to a pressure of 1.0 - 1.5 MPa, keep the temperature at 180°C - 200°C, keep the pressure constant for 24 hours, and finally reduce the pressure for 2 h to normal pressure until the steam is completely discharged.

[0034] The beneficial effects of adopting the above improvement scheme are as follows: Through the above settings, the structure of the ventilation joint is more stable.

[0035] Further, the step of fabricating the ventilation duct in sections and assembling it on the construction site in step S50 specifically includes the following steps:

[0036] First step: Connect the duct sections to the angle steel flange by flanging and riveting method, and rivet the duct sections and the angle steel flange with galvanized rivets;

[0037] Second step: Connect the duct sections end to end and fix them through the angle steel flange. An asbestos gasket is provided between the angle steel flanges and sealing material is filled;

[0038] Third step: Adjust the connected ventilation duct installation module to be horizontal and check the installation quality of the ventilation duct installation module.

[0039] Further, the rubber shock pad is composed of a top cushion layer, a bottom cushion layer, a middle rubber cushion layer, an internal rubber interlayer and an interlayer board. The interlayer board is a fiberglass composite material. The interlayer board is arranged horizontally and the interlayer board is wrapped inside the middle rubber cushion layer. The internal rubber interlayer is located between the interlayer boards. The interlayer board and the internal rubber interlayer are combined by bonding or vulcanization.

[0040] Further, the steps of rust prevention treatment and heat preservation treatment on the surface of the ventilation duct and the connection part with the ventilation joint in step S70 specifically include the following steps:

[0041] First step: Remove rust from the surface of the ventilation duct and the connection part with the ventilation joint;

[0042] Second step: Apply two coats of rust-proof paint and then two coats of topcoat on the surface of the ventilation duct and the connection part with the ventilation joint;

[0043] Third step: Wrap the centrifugal glass wool around the surface of the ventilation duct and the connection part with the ventilation joint with heat preservation nails.

[0044] Before installing the centrifugal glass wool, wipe the dust and oil stains on the surface of the ventilation duct and on the heat preservation nails clean, then apply an adhesive on the surface of the ventilation duct and on the heat preservation nails, then pass the adhesive through the centrifugal glass wool and bond it to the surface of the ventilation duct, and finally bond the joints of the centrifugal glass wool with heat preservation tape. By setting up the operation process of rust prevention and heat preservation, the problems of rust prevention and heat preservation of the ventilation duct can be solved, the service life of the ventilation duct can be extended, and the maintenance cost can be saved.

[0045] Further, the reinforcement member is a U-shaped reinforcement member. The top of the reinforcement member is sleeved on the surface of the ventilation duct. An opening is provided at the bottom of the reinforcement member. Connecting portions extend outwardly from both sides of the opening, and the connecting portions are fixedly connected to the top surface of the exhibition hall building by welding.

[0046] The beneficial effects of adopting the above improvement scheme are as follows: By providing the reinforcement member, the ventilation duct can be fixed on the top surface of the exhibition hall building, preventing it from shifting during ventilation due to the vibration of the ventilation duct, and also avoiding the displacement of the ventilation duct caused by the wind and the loosening of the connection.

[0047] Compared with the prior art, the beneficial effects of a modular installation method for high-altitude ventilation ducts in an exhibition hall provided by the present invention are as follows: By establishing a ventilation duct model, it is beneficial to conduct collision checks in advance and optimize the layout effect of the ducts; by modularly decomposing the ventilation ducts, modular prefabrication and production of the ventilation ducts in a factory can be realized, improving the utilization rate of materials, solving the problem of site restrictions, and being able to speed up the construction progress; by arranging the ventilation ducts on the outer top of the exhibition hall building and using the ventilation openings to supply air indoors, the noise pollution caused by the vibration generated during the air supply process of the ventilation ducts can be significantly reduced, and at the same time, the problem of the loosening of the supports and hangers of the ventilation ducts caused by the vibration effect, resulting in the ventilation ducts not being firmly fixed inside the roof, is also solved; by providing a rubber shock isolation pad at the bottom of the ventilation duct, the rubber shock isolation pad has the characteristics of large vertical bearing capacity, light weight, good weather resistance, convenient installation, and low cost, and can effectively reduce the vibration effect generated during the air supply of the ventilation duct; by using a ventilation joint made of autoclaved aerated concrete at the ventilation opening, and utilizing the adsorption capacity of autoclaved aerated concrete blocks for toxic and harmful substances such as formaldehyde, benzene, and ammonia, a certain antibacterial and sterilizing effect can be produced on the air flowing through the ventilation opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 It is a flowchart of a modular installation method for high-altitude ventilation ducts in an exhibition hall proposed by the present invention;

[0050] Figure 2 It is a schematic structural diagram of a rubber shock isolation pad in a modular installation method for high-altitude ventilation ducts in an exhibition hall proposed by the present invention;

[0051] In the drawings, the list of components represented by each reference numeral is as follows:

[0052] 10. Top cushion layer; 11. Bottom cushion layer; 12. Middle rubber cushion layer; 13. Inner rubber interlayer; 14. Interlayer board. Detailed implementation mode

[0053] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0055] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0057] As Figure 1 shown, it is a flowchart of a modular installation method for high-altitude ventilation ducts in an exhibition hall provided by the present invention, which specifically includes the following steps:

[0058] S10: Model the exhibition hall building, set ventilation openings on the outer side of the top of the exhibition hall building in combination with the design requirements, arrange ventilation ducts, and establish a ventilation duct model;

[0059] S20: Combine the direction of the ventilation ducts and the selected sheet material specifications, modularly decompose the ventilation duct model, and determine the opening positions of each ventilation opening and the installation positions of the ventilation duct modules;

[0060] S30: Conduct lofting and positioning on the site conditions of the exhibition hall building, and conduct recheck measurement on the installation positions of each ventilation duct module;

[0061] S40: Open ventilation openings on the top of the exhibition hall, and install ventilation joints made of autoclaved aerated concrete blocks inside the ventilation openings;

[0062] S50: Fabricate ventilation ducts in sections at the processing site, and transport them to the construction site for assembly to form ventilation duct installation modules;

[0063] S60: Lay rubber shock pads at the installation positions of the ventilation duct modules, use a hydraulic lift to hoist and install the ventilation duct installation modules above the rubber shock pads, and connect them to the ventilation joints;

[0064] S70: Conduct anti-rust treatment and thermal insulation treatment on the surface of the ventilation ducts and the connection parts with the ventilation joints, and set reinforcing members at equal intervals on the surface of the ventilation ducts;

[0065] S80: Weld and fix the reinforcing members to the top surface outside the exhibition hall building.

[0066] Among them, a protective cover or protective net is provided inside the ventilation joint; the assembly requirements of the ventilation ducts are as follows: assemble in the order of main trunk first and branches later; assemble in the order of large pipe diameter first and small pipe diameter later; the assembly of the ventilation ducts and the ventilation openings is carried out finally; the total length of a single ventilation duct installation module does not exceed 12m; when the air contains combustible gas lighter than air, the horizontal exhaust air duct is laid with an upward slope along the air flow direction throughout the whole length.

[0067] After modeling the exhibition hall building and the ventilation ducts, conduct collision detection with reference to the pipeline comprehensive drawings, count and classify the collision points, and optimize the problems found in the collision.

[0068] Further, in the above technical solution, training the shrinkage model of the block blank, and inputting the design size of the ventilation joint to obtain the cutting size of the block blank specifically includes the following steps:

[0069] The first step: Make block blanks of different sizes, and record the external dimensions of the block blanks as data set one; after autoclaving and curing the block blanks of different sizes, record the external dimensions of the block blanks after autoclaving and curing as data set two;

[0070] The second step: Establish a neural network model, use data set two as the training input data, use data set one as the training output data, train the neural network model, and obtain the shrinkage model of the block blank;

[0071] Step 3: Use the design dimensions of the ventilation joint as the new dataset two and input it into the block blank shrinkage model for calculation to obtain the new dataset one, which is the cutting dimensions of the block blank.

[0072] It should be noted that the neural network is a neural network learning algorithm. In the present invention, the block blank shrinkage model selected is a BP neural network model, which is a hierarchical neural network composed of an input layer, an intermediate layer, and an output layer. The intermediate layer can be extended to multiple layers. All neurons between adjacent layers are fully connected, while there is no connection between neurons in each layer. Each neuron obtains the input response of the network to generate connection weights. Then, in the direction of reducing the error between the desired output and the actual output, the connection weights are corrected layer by layer from the output layer through each intermediate layer back to the input layer. This process is repeated alternately until the global error of the network approaches a given minimum value, that is, the learning process is completed.

[0073] Among them, in the above technical solution, the manufacturing method of the ventilation joint is as follows:

[0074] Step 1: Mix the base material, solid dry material, foaming material, adsorbent material, and water and stir evenly to form a mixed material;

[0075] Step 2: Brush the inner wall of the block mold with oil once, inject the mixed material into the block mold, cover the surface with a film, keep the temperature at 85 ± 5 °C, and stand for pre-curing for 85 - 100 min to obtain the block blank;

[0076] Step 3: Train the block blank shrinkage model and input the design dimensions of the ventilation joint to obtain the cutting dimensions of the block blank;

[0077] Step 4: Demold the block blank, cut and shape it according to the cutting dimensions of the block blank, and transfer it to an autoclave for autoclave curing to obtain the ventilation joint.

[0078] It should be noted that apply MC2.5 cement mortar with the thinnest part being 10 mm in the air duct of the ventilation joint made of autoclaved aerated concrete blocks. When there is a heat preservation requirement, first apply 50 mm thick composite silicate heat preservation material and then increase the inner lining according to the non-heat preservation air duct method. When the ventilation duct is connected to the ventilation opening, first cut out a groove connected to the ventilation duct at the joint part of the ventilation joint, adopt the method of inserting a flanged metal air duct, and fix and seal it tightly with inorganic fireproof putty or fireproof mortar. When the air duct passes through a fireproof and explosion-proof wall or floor that needs to be closed, set a steel protection sleeve with a thickness of not less than 1.6 mm at the connection; tightly seal the gap between the air duct and the protection sleeve with non-combustible flexible material.

[0079] Further, in the above technical solution, the base materials include the following raw materials: lime, cement, fiber, sand, gypsum, ceramic waste residue, fly ash; the solid dry materials include the following raw materials: water retaining agent, mint, senecio scandens, tea leaves, dried ginger; the foaming materials include the following raw materials: foaming agent, foam stabilizer; the adsorption materials include the following raw materials: formaldehyde purification adsorbent, tea leaves and fiber.

[0080] It should be noted that the water retaining agent is a superabsorbent resin. Adding a water retaining agent to autoclaved aerated concrete blocks can keep the ventilation joints at a certain humidity, reduce the dry shrinkage value of the ventilation joints, reduce the water loss inside the blocks in a dry environment, and prevent the blocks from cracking easily; in a humid environment, it can reduce the decay and collapse of the blocks caused by long-term humidity.

[0081] The foaming agent is a substance that makes the target material form pores, which can endow the blocks with properties such as light weight, heat insulation, and sound insulation. In the present invention, a silicate type foaming agent is selected, which can make the ventilation joints have fine and smooth pores, so as to achieve effects such as heat insulation, sound insulation, and fire prevention.

[0082] The foam stabilizer is a surfactant with the property of prolonging and stabilizing the foam retention time, used to control the size and quantity of the bubbles generated in the concrete to achieve a more uniform and stable block structure. In the present invention, an acrylic acid type foam stabilizer is selected, which is suitable for the production of concrete added with bituminous coal ash materials and can effectively control the size and distribution of the bubbles.

[0083] Further, in the above technical solution, the weight parts of each component in the solid dry materials are as follows: 0.5 - 0.7 parts of water retaining agent, 7 - 9 parts of mint, 7 - 9 parts of senecio scandens, 5 - 6 parts of tea leaves, 5 - 7 parts of dried ginger; the weight parts of each component in the adsorption materials are as follows: 26 - 41 parts of formaldehyde purification adsorbent, 5 - 10 parts of tea leaves, 3 - 4 parts of fiber.

[0084] Further, in the above technical solution, the steps of autoclave curing are specifically as follows: first, evacuate to a pressure of 0.06 MPa, then introduce steam to increase the pressure to 1.0 - 1.5 MPa in 2.5 h, keep the temperature at 180°C - 200°C, maintain the pressure for 24 hours, and finally reduce the pressure to normal pressure in 2 h until the steam is completely discharged.

[0085] Further, in the above technical solution, the specific steps of segmentally manufacturing the ventilation duct and assembling it on the construction site in step S50 include the following steps:

[0086] First step, connect the duct segments to the angle steel flange by flanging riveting method, and rivet the duct segments and the angle steel flange with galvanized rivets.

[0087] Step 2: Perform butt joint connection between the segmented air ducts and fix them through angle steel flanges. Set asbestos rubber gaskets between the angle steel flanges and fill with sealing materials.

[0088] Step 3: Adjust the connected ventilation duct installation module to be horizontal and check the installation quality of the ventilation duct installation module.

[0089] During use, use an asbestos rubber gasket with a thickness of 4 mm and a stiffness ≥ FB3 as the gasket; and the sealing material is a non-combustible material, and the non-combustibility requirement is Class A; to ensure smooth ventilation and enhanced fire prevention performance.

[0090] As Figure 2 shown, further, in the above technical solution, the rubber shock pad is composed of a top cushion layer 10, a bottom cushion layer 11, a middle rubber cushion layer 12, an inner rubber sandwich layer 13 and a sandwich board 14. The sandwich board 14 is a glass fiber composite material. The sandwich board 14 is arranged horizontally and the sandwich board 14 is wrapped inside the middle rubber cushion layer 12. The inner rubber sandwich layer 13 is located between the sandwich boards 14. The sandwich board 14 and the inner rubber sandwich layer 13 are bonded or vulcanized together.

[0091] Further, in the above technical solution, the rust prevention treatment and heat preservation treatment of the surface of the ventilation duct and the connection part with the ventilation joint in step S70 specifically include the following steps:

[0092] Step 1: Perform rust removal treatment on the surface of the ventilation duct and the connection part with the ventilation joint.

[0093] Step 2: Apply two coats of rust-proof paint and then two coats of topcoat on the surface of the ventilation duct and the connection part with the ventilation joint.

[0094] Step 3: Wrap the centrifugal glass wool around the surface of the ventilation duct and the connection part with the ventilation joint using heat preservation nails.

[0095] Further, in the above technical solution, the reinforcement member is a U-shaped reinforcement member. The top of the reinforcement member is sleeved on the surface of the ventilation duct. The bottom of the reinforcement member is provided with an opening. Both sides of the opening extend outward to form connecting parts. The connecting parts are fixedly connected to the top surface of the exhibition hall building by welding.

[0096] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A modular installation method for high-altitude ventilation ducts in exhibition halls, characterized in that, It includes the following steps: S10: Model the exhibition hall building, set ventilation openings on the outer side of the top of the exhibition hall building in combination with the design requirements, arrange ventilation ducts, and establish a ventilation duct model; S20: Modularly decompose the ventilation duct model in combination with the orientation of the ventilation duct and the selected sheet material specifications, and determine the opening positions of each ventilation opening and the installation positions of ventilation duct modules; S30: Loft and position the on-site situation of the exhibition hall building, and conduct recheck measurements on the installation positions of each ventilation duct module; S40: Open the ventilation openings on the top of the exhibition hall, and install ventilation joints made of autoclaved aerated concrete blocks in the ventilation openings; S50: Segmentally manufacture the ventilation ducts at the processing site and transport them to the construction site for assembly to form a ventilation duct installation module; S60: Lay rubber shock pads at the installation positions of the ventilation duct modules, use a hydraulic lift to hoist and install the ventilation duct installation module above the rubber shock pads, and connect it to the ventilation joints; S70: Conduct anti-rust treatment and thermal insulation treatment on the surface of the ventilation ducts and the connection parts with the ventilation joints, and equally space and set reinforcement members on the surface of the ventilation ducts; S80: Weld and fix the reinforcement members to the top surface on the outer side of the exhibition hall building; The manufacturing method of the ventilation joint is as follows: The first step: Mix basic materials, solid dry materials, foaming materials, adsorption materials and water evenly to form a mixed material; The second step: Brush the inner wall of the block mold with oil once, inject the mixed material into the block mold, cover the surface with a film, keep the temperature at 85±5°C, and stand for pre-curing for 85 - 100 minutes to obtain a block blank; The third step: Train the shrinkage model of the block blank, and input the design size of the ventilation joint to obtain the cutting size of the block blank; The fourth step: Demold the block blank, cut and form it according to the cutting size of the block blank, and move it into an autoclave for autoclave curing to obtain the ventilation joint; The training of the shrinkage model of the block blank, and inputting the design size of the ventilation joint to obtain the cutting size of the block blank specifically includes the following steps: The first step: Make block blanks of different sizes, and record the external dimensions of the block blanks as data set one; after autoclave curing the block blanks of different sizes, record the external dimensions of the block blanks after autoclave curing as data set two; The second step: Establish a neural network model, use data set two as the training input data and data set one as the training output data to train the neural network model to obtain the shrinkage model of the block blank; The third step: Input the design size of the ventilation joint as a new data set two into the shrinkage model of the block blank for calculation to obtain a new data set one, and the new data set one is the cutting size of the block blank.

2. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 1, characterized in that, The base materials include the following raw materials: lime, cement, fiber, sand, gypsum, ceramic waste residue, fly ash; the solid dry materials include the following raw materials: water retaining agent, mint, senecio scandens, tea leaves, dried ginger; the foaming materials include the following raw materials: foaming agent, foam stabilizer; the adsorption materials include the following raw materials: formaldehyde purification adsorbent, tea leaves and fiber.

3. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 2, characterized in that, The weight parts of each component in the solid dry materials are respectively: 0.5 - 0.7 parts of water retaining agent, 7 - 9 parts of mint, 7 - 9 parts of senecio scandens, 5 - 6 parts of tea leaves, 5 - 7 parts of dried ginger; the weight parts of each component in the adsorption materials are respectively: 26 - 41 parts of formaldehyde purification adsorbent, 5 - 10 parts of tea leaves, 3 - 4 parts of fiber.

4. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 3, characterized in that, The steps of autoclave curing are specifically as follows: first evacuate to a pressure of 0.06 MPa, then introduce steam to increase the pressure to 1.0 - 1.5 MPa in 2.5 h, keep the temperature at 180°C - 200°C, keep the pressure constant for 24 hours, and finally reduce the pressure to atmospheric pressure in 2 h until the steam is completely discharged.

5. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 4, characterized in that, In step S50, segmentally manufacturing the ventilation duct and assembling it on the construction site specifically includes the following steps: First step, connect the duct segments to the angle steel flange by flanging riveting method, and rivet the duct segments and the angle steel flange with galvanized rivets; Second step, make butt joint connections between the duct segments and fix them through the angle steel flange. An asbestos gasket is arranged between the angle steel flanges as a gasket, and sealing materials are filled; Third step, adjust the connected ventilation duct installation module to be horizontal and check the installation quality of the ventilation duct installation module.

6. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 5, characterized in that The rubber shock isolation pad is composed of a top cushion layer (10), a bottom cushion layer (11), a middle rubber cushion layer (12), an internal rubber interlayer (13) and an interlayer board (14). The interlayer board (14) is a glass fiber composite material. The interlayer board (14) is arranged horizontally and the interlayer board (14) is wrapped inside the middle rubber cushion layer (12). The internal rubber interlayer (13) is located between the interlayer boards (14). The interlayer board (14) and the internal rubber interlayer (13) are combined by bonding or vulcanization.

7. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 6, characterized in that In step S70, the steps of rust prevention treatment and heat preservation treatment on the surface of the ventilation duct and the connection part with the ventilation joint specifically include the following steps: First step, conduct rust removal treatment on the surface of the ventilation duct and the connection part with the ventilation joint; Second step, apply two coats of rust preventive paint and then two coats of topcoat on the surface of the ventilation duct and the connection part with the ventilation joint; Third step, use heat preservation nails to wrap centrifugal glass wool on the surface of the ventilation duct and the connection part with the ventilation joint.

8. A modular installation method for high-altitude ventilation ducts in an exhibition hall according to claim 7, characterized in that The reinforcement member is a U-shaped reinforcement member. The top of the reinforcement member is sleeved on the surface of the ventilation duct. The bottom of the reinforcement member is provided with an opening. Both sides of the opening extend outward to form connection parts. The connection parts are fixedly connected to the top surface of the exhibition hall building by welding.

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