Construction technology of ventilation system for platform canopy construction

Abstract

The invention provides a construction technology of a ventilation system for platform canopy construction, and relates to the technical field of platform canopy ventilation. The construction technology of the ventilation system for platform canopy construction comprises the steps of early-stage investigation and survey, equipment type selection, construction preparation, ventilation pipeline machining, ventilation pipeline installation, fan and air valve installation, air filtering device installation and system debugging, through early-stage investigation and system planning, the efficiency of the ventilation system can be effectively improved, it is guaranteed that ventilation of all areas of a platform is uniform, and the construction efficiency is improved. The air quality is improved, a more comfortable waiting environment is provided for passengers, meanwhile, the requirements for heat dissipation and the like of equipment operation are met, strict and normative pipeline machining and installation processes and high-quality equipment installation are adopted, the connection tightness and the structural stability of the ventilation system are guaranteed, interfaces with other platform facilities are reserved, system integration and cooperative work are conveniently achieved, and the ventilation effect is improved. The overall intelligent management level of the platform is improved, information sharing and linkage control are achieved, and the operation management efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of platform canopy ventilation, and in particular to a construction process of a ventilation system for platform canopy construction. Background Art

[0002] With the vigorous development of the transportation industry, the environmental quality of platforms, as important places for passengers to get on and off the train, has received increasing attention.

[0003] However, there are many deficiencies in the current construction technology of platform canopy ventilation systems. Traditional construction technology often lacks in-depth analysis of the actual situation of the platform, and fails to fully consider factors such as the platform building structure characteristics, personnel flow patterns, and local climatic conditions, resulting in unreasonable ventilation system layout and uneven ventilation effects; in terms of equipment selection, there are problems such as fan performance mismatch and imprecise air valve adjustment, which affect the overall performance of the ventilation system; during the construction process, the processing and installation quality of the ventilation ducts is difficult to guarantee, such as low cutting accuracy and loose connections, which can easily cause air leakage, corrosion and other problems, reducing the service life of the system; and the existing ventilation system has poor integration with other platform facilities, and cannot achieve intelligent management and collaborative work; in addition, although the existing platform canopy is an open design, in hot, humid and stuffy weather conditions, the waiting environment for passengers under the platform canopy cannot be improved due to the open design.

[0004] Therefore, there is an urgent need for a scientific, reasonable, efficient and reliable ventilation system construction process for platform canopy construction to improve the quality and operating efficiency of the platform ventilation system and create a comfortable and safe waiting environment for passengers. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a construction process for a ventilation system for platform canopy construction, including:

[0006] S1. Preliminary research: Detailed mapping of the platform canopy structure, analysis of platform personnel flow distribution, train operation patterns and local climate conditions, comprehensive assessment of ventilation needs, determination of the overall layout of the ventilation system, planning of air inlet and outlet locations and ventilation duct directions;

[0007] S2. Equipment selection: Based on the calculation results of ventilation demand, select a fan that meets the air volume and air pressure requirements and is energy-efficient and efficient. At the same time, select an air valve and an appropriate air outlet with high adjustment accuracy, good sealing and weather resistance;

[0008] S3. Construction preparation: Draw accurate construction drawings and strictly review them to ensure they are correct; purchase high-quality materials and equipment according to the drawings and conduct strict inspections upon arrival; clean up the construction site, build necessary temporary facilities, and take safety precautions;

[0009] S4. Ventilation duct processing: accurately cut and bend ventilation ducts according to design requirements, ensure accurate size and shape, and accurately punch holes at specified locations;

[0010] S5. Ventilation duct installation: Install the duct according to the design direction and the spacing between supports and hangers, use an appropriate connection method to ensure that the connection is tight and firm, and install supports and hangers to ensure the stability of the duct;

[0011] S6. Fan and air valve installation: Install the fan firmly on the foundation, ensure horizontality and verticality, and achieve tight and flexible connection with the ventilation duct; install the air valve in a convenient place to ensure flexible opening and closing, precise adjustment, and the material meets the weather resistance requirements;

[0012] S7. Installation of air filter: Select appropriate filter and install it in a reasonable position to ensure good sealing with the pipeline, easy cleaning and replacement, and regular maintenance to ensure filtering effect;

[0013] S8. System debugging: After completing the installation, conduct a comprehensive inspection, start the fan to test ventilation volume, wind pressure and other parameters, and make optimization adjustments based on the design requirements to ensure stable operation of the system.

[0014] In addition, the construction process of a ventilation system for platform canopy construction according to an embodiment of the present application also has the following additional technical features:

[0015] Preferably, before the ventilation duct is installed, the duct is pre-processed, including cutting, bending, and punching operations, to ensure that the size and shape of the duct meet the design requirements, and the duct is treated with anti-corrosion and anti-rust.

[0016] Preferably, the ventilation ducts are connected in a manner with good sealing performance, and sealing materials are used at the connections to ensure the air tightness of the ventilation system.

[0017] Preferably, when installing the fan, ensure that the foundation of the fan is firm, the horizontality and verticality meet the installation standards, and the connection between the fan and the ventilation duct is tight without vibration and air leakage.

[0018] Preferably, the air valve is installed in a position that is convenient for operation and adjustment. The air valve is flexible in opening and closing, can accurately control the ventilation volume, and the material of the air valve has good weather resistance and strength.

[0019] Preferably, an air filter device is provided in the ventilation system, which can effectively filter pollutants in the air, and the filter device is easy to clean and replace.

[0020] Preferably, the entire ventilation system is debugged to ensure that the ventilation system operates stably and meets the ventilation requirements of the platform.

[0021] Preferably, establish a maintenance plan for the ventilation system, regularly inspect, clean and maintain the ventilation equipment, pipes, and filters to extend the service life of the ventilation system.

[0022] Preferably, the design and construction of the ventilation system complies with relevant building codes and safety standards to ensure that no safety hazards are posed to personnel and facilities during the use of the platform.

[0023] Preferably, interfaces with other station facilities are reserved in the ventilation system to achieve system integration and collaborative work.

[0024] According to a construction process of a ventilation system for platform canopy construction according to an embodiment of the present application, the beneficial effects are:

[0025] 1. Through precise preliminary research and reasonable system planning, the ventilation layout and equipment selection are determined in combination with the actual situation of the platform, which can effectively improve the efficiency of the ventilation system, ensure uniform ventilation in all areas of the platform, improve air quality, provide passengers with a more comfortable waiting environment, and meet the heat dissipation requirements of equipment operation;

[0026] 2. During the construction process, strict and standardized pipeline processing and installation technology, as well as high-quality equipment installation, ensure the tightness of the ventilation system connection and structural stability, reduce problems such as air leakage and vibration, thereby extending the service life of the system and reducing maintenance costs;

[0027] 3. Reserve interfaces with other platform facilities to facilitate system integration and collaborative work, enhance the overall intelligent management level of the platform, realize information sharing and linkage control, and improve operational management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a flow chart of a construction process of a ventilation system for platform canopy construction according to an embodiment of the present application;

[0030] Figure 2 It is a block diagram of the preliminary investigation according to the embodiment of the present application;

[0031] Figure 3 is a block diagram of device selection according to an embodiment of the present application;

[0032] Figure 4 is a block diagram of construction preparation according to an embodiment of the present application;

[0033] Figure 5 It is a block diagram of the ventilation duct installation according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The following describes in detail the construction process of a ventilation system for platform canopy construction of the present invention through specific implementation methods:

[0036] 1. Preliminary research

[0037] 1. Structural and environmental analysis

[0038] Organize a professional surveying team to use high-precision surveying instruments (such as total stations) to conduct comprehensive surveying of the platform canopy, and record in detail the canopy's geometric shape (including length, width, height, curvature, etc.), structural type (such as steel structure, concrete structure, etc.) and support system layout. For example, for a steel canopy, it is necessary to accurately measure the specifications of the steel beams (such as cross-sectional dimensions, thickness), spacing, and the form of the connection nodes.

[0039] Collect meteorological data for at least the past three years at the location of the platform, including information such as the average temperature, relative humidity, wind direction frequency, and precipitation in the four seasons. Analyze common extreme weather conditions in the local area, such as the intensity of rainstorms and strong wind levels, so as to design targeted protective measures for the ventilation system. At the same time, combined with the actual use of the platform, statistics are collected on changes in passenger flow in different time periods (such as weekdays and holidays, peak hours and non-peak hours), as well as the frequency of train arrivals and departures and the duration of stops, to provide a basis for determining the operating mode of the ventilation system.

[0040] 2. Ventilation demand calculation and layout planning

[0041] According to the platform area, population density and building space volume, refer to the calculation method of fresh air volume for personnel in the "Energy-saving Design Standard for Public Buildings" to calculate the minimum ventilation volume required for the platform under different working conditions. For example, for a large platform with dense population, the fresh air volume required per person per hour during peak hours should not be less than 30m 3 , and calculate the total ventilation demand in combination with the maximum passenger capacity to ensure that passengers under the platform canopy can have a good experience environment regardless of the weather conditions.

[0042] The best locations for air inlets and outlets should be determined based on the local dominant wind direction and the orientation of the platform. Air inlets should be located in areas with smooth air circulation and few pollution sources, such as the upwind side away from vehicle exhaust outlets and garbage dumps; air outlets should be located in locations that are conducive to air flow diffusion and will not directly affect passengers, such as high places at both ends or sides of the platform. At the same time, the principle of natural ventilation should be used, combined with the structural characteristics of the platform canopy, to optimize the direction of the ventilation ducts so that air can form natural convection in the platform and improve ventilation efficiency.

[0043] For example, for arched canopies, the height difference between the arch and the two sides can be used to design reasonable ventilation paths to promote the natural circulation of air, or ventilation equipment can be installed on the top of the platform canopy to blow air downward. The specific air supply temperature depends on the season or the actual air environment. For example, in hot weather conditions, cool air can be supplied, and in cold weather conditions, warm air can be supplied, and so on, to improve the passengers' waiting experience.

[0044] In the specific embodiment of the present application, the ventilation system used for the construction of the platform canopy mainly includes a centralized air-conditioning system, a fan coil unit plus a fresh air system, a split air-conditioning system, a full air system, an air-conditioning water system, an air supply system, an exhaust system, a smoke prevention system, and a smoke exhaust system.

[0045] Among them, the station building uses an integrated air-cooled chiller (evaporative cooling type) as the cooling source; the waiting room uses a full air stratified air conditioning system, the communication and information equipment room is equipped with a dedicated air conditioner for the room, the transformer and distribution room is equipped with temperature-controlled ventilation and air conditioning auxiliary cooling, and the public network room is equipped with reserved equipment system implementation conditions; the bathroom is equipped with air conditioners; other areas are equipped with ventilation and air conditioning facilities according to functional zoning;

[0046] The waiting room adopts a full air conditioning system. All fresh air places equipped with a full air system use CO2 concentration control to control the fresh air volume;

[0047] Natural ventilation is preferred for the waiting hall, comprehensive service center and passenger service in non-air-conditioned seasons; toilets are equipped with mechanical exhaust systems; substations are equipped with intelligent temperature-controlled axial flow fans for mechanical exhaust and SF6 emergency exhaust, with emergency exhaust ventilation ventilation frequency of 12 times / h; substations are also equipped with mechanical air supply, and the air supply volume is not less than 80% of the exhaust volume; fire pump rooms, wiring rooms, power distribution rooms, cable rooms and other equipment rooms are equipped with mechanical exhaust facilities to remove excess heat and moisture, and natural air supply;

[0048] Closed stairwells all use natural ventilation to prevent smoke; electric smoke exhaust windows are installed in waiting halls and other large spaces for natural smoke exhaust; internal corridors with a length of more than 20m cannot meet the conditions for natural smoke exhaust, so 2㎡ smoke exhaust windows are installed for natural air supply; natural smoke exhaust is used in auxiliary rooms in each station area.

[0049] (II) Equipment selection

[0050] 1. Fan selection

[0051] According to the ventilation volume and required wind pressure calculated in the previous step, select the appropriate fan model in the fan product selection manual. Make sure that the air volume range of the selected fan is within ±10% of the calculated ventilation volume and the wind pressure meets the system resistance requirements. For example, if the calculated ventilation volume is 40,000m 3 / h, wind pressure is 800Pa, then select air volume between 36000-44000m 3 / h, and a fan with a wind pressure between 750-850Pa. At the same time, pay attention to the energy efficiency ratio of the fan, and give priority to energy-saving fans with energy efficiency levels of 2 or above (according to relevant energy efficiency standards) to reduce long-term operating costs.

[0052] Consider the noise requirements of the platform environment and select fans whose noise values ​​meet the limits of the corresponding areas in the "Acoustic Environment Quality Standards". Generally, the platform area belongs to the Class 2 acoustic environment functional area, and the fan noise value should not exceed 60dB(A) during the day and 50dB(A) at night. For noise-sensitive areas, fans equipped with soundproof covers or silencers can be selected to ensure that the noise generated by the fan during operation will not disturb passengers.

[0053] 2. Selection of air valves and air outlets

[0054] According to the regulation requirements of the ventilation system, select air valves of different types and specifications. For areas where the air volume needs to be precisely controlled, such as equipment rooms and crowded areas, electric regulating valves are selected. The adjustment accuracy should be within ±5%, and the ventilation volume can be adjusted in real time according to actual needs. For general ventilation areas, manual air valves can be selected, which require easy and flexible operation and reliable opening and closing. The material of the air valve should have good weather resistance and strength. If stainless steel or aluminum alloy is selected, the thickness is determined according to the size of the air valve, generally not less than 1.2mm, to ensure that it will not deform or corrode during long-term use.

[0055] The selection of air vents should be combined with the decoration style and functional requirements of the platform. Choose beautiful and practical air vent types, such as square diffusers, round diffusers and strip air vents for air supply. Before installation, they should be coordinated with the decoration to achieve a perfect decorative effect. The connection between the air vent and the air duct should be tight and firm; the frame should be close to the building decoration surface, the outer surface should be flat and not deformed, and the adjustment should be flexible; the deviation of the horizontality of the horizontal installation of the air vent should not be greater than 3 / 1000, and the deviation of the verticality of the vertical installation of the air vent should not be less than 2 / 1000.

[0056] In the specific embodiments of the present application, according to different installation positions, the air valve uses a manual single-blade or multi-blade adjustable air valve, and a check air valve. Among them, the manual single-blade or multi-blade adjustable air valve should have a firm structure and be flexible in opening and closing. The flange should be consistent with the air duct of the corresponding material. The overlap of the blades should be consistent and the gap with the valve body should be less than 2mm. The air width with a cross-sectional area greater than 12㎡ should be adjusted in groups; the check air valve should be flexible in opening and closing and should be tight when closed. The shaft and hinge of the valve leaf should be made of materials that are not easy to rust to ensure flexible and durable rotation. The strength of the valve leaf should ensure that it does not bend or deform under the maximum load pressure; the horizontally installed check air valve should have a reliable balancing and adjusting mechanism.

[0057] 3. Selection of hood

[0058] The size should be correct and the structure should be reliable. The allowable deviation of the size of the hood connecting pipe should be consistent with the regulations for the air duct; the edge of the umbrella cover of the umbrella-shaped hood should be reinforced, and the support height size should be consistent; the centers of the inner and outer cones of the conical hood should be concentric, the connection seams of the cone combination should be water-friendly, and the lower drainage should be unobstructed; the shape of the cylindrical hood should be regular, the upper and lower edges of the outer shell should be reinforced, and the out-of-roundness should not be greater than 2% of the diameter. The distance between the edge of the cover and the outer shell should be consistent, and the position of the wind shield should be correct; the angles of the three branches of the trident hood should be consistent, and the connection with the main pipe should be tight, and the main pipe and branch pipe should be 3 to 4 degrees.

[0059] 4. Selection of guide vanes

[0060] The windward edge of the rectangular elbow guide vane should be smooth and firmly fixed. The curvature of the guide vane should be consistent with the angle of the elbow. The distribution of the guide vane should comply with the design requirements. When the length of the guide vane exceeds 1250mm, reinforcement measures should be taken.

[0061] 5. Selection of flexible short pipe

[0062] Flexible materials that are anti-corrosive, moisture-proof, airtight, and not prone to mildew should be selected. Measures to prevent condensation should also be taken for air-conditioning systems; materials used for purification air-conditioning systems should also have smooth inner walls and be less likely to generate dust;

[0063] The length of the flexible short pipe should generally be 150-300mm, and its connection should be tight, firm and reliable;

[0064] Flexible short pipes should not be used as reducing pipes for alignment and leveling;

[0065] The length of the flexible short tube installed in the structural deformation joint should be the width of the deformation joint plus 100mm or more.

[0066] (III) Construction preparation

[0067] 1. Construction drawing drawing and review

[0068] Experienced HVAC engineers use professional drawing software (such as AutoCAD MEP) to draw detailed construction drawings based on the preliminary research and equipment selection results. The scale of the drawings should be no less than 1:50, and all components of the ventilation system should be clearly marked, including the direction, diameter, elevation of the ventilation duct, the installation location of the fan, air valve, air outlet and other equipment, the form and spacing of the support brackets, etc. At the same time, detailed node details should be drawn, such as pipeline connection nodes, equipment installation nodes, etc., to ensure that construction personnel can accurately understand the construction requirements.

[0069] Carefully carry out the unpacking inspection and acceptance of the installed equipment, check the quality and quantity of the random technical documents, supporting electrical, instrumentation and spare parts according to the packing list, and check whether there are any defects. If any problems are found, the solution and time should be determined in time, and both parties should sign and approve, and carefully make unpacking inspection records.

[0070] For the acceptance of the equipment foundation, the construction unit shall first submit the construction records and concrete strength records of the civil equipment foundation; then, according to the requirements of the equipment layout diagram and the equipment foundation diagram, carefully check the geometric dimensions, elevations, and center lines of the equipment foundation for re-measurement and inspection. During the re-measurement, the main geometric dimensions (elevation, center line) shall be marked on the equipment foundation. The appearance of the foundation shall not have defects such as cracks, honeycombs, voids, exposed reinforcement, etc. The deviations of the geometric dimensions, elevations, and center lines shall meet the requirements specified in the specifications. When the foundation is accepted, the debris in the anchor bolt holes shall be cleaned up.

[0071] The strength grade of concrete used for secondary grouting of equipment anchor bolt holes should be one grade higher than the design strength of the equipment foundation. The sand and gravel used must be washed clean, and concrete test blocks must be prepared in advance. Formal construction can only be carried out after the test blocks are qualified.

[0072] During the civil construction of the refrigeration room, air-conditioning room, fan room, and pump room, attention should be paid to the coordination and communication with the civil construction unit to reserve the installation walls for the equipment to enter. After the equipment is installed, the reserved installation walls should be closed.

[0073] Safety covers should be made and installed on all exposed transmission mechanisms such as V-belts and couplings. Belt covers can be selected and manufactured according to the national standard atlas of heating and ventilation.

[0074] 2. Materials and Equipment Preparation

[0075] According to the requirements of the construction drawings, select ventilation ducts, fans, air valves, air outlets, supports and hangers and other materials and equipment that meet national standards and industry specifications. Ventilation ducts can be made of galvanized steel plates. When the pipe diameter is less than 500mm, the thickness of the galvanized steel plate shall not be less than 0.75mm; when the pipe diameter is greater than 500mm, the thickness shall not be less than 1.0mm (refer to the "Quality Acceptance Specifications for Ventilation and Air Conditioning Engineering Construction"). The fan should have quality certification documents such as product certificates and test reports, and its performance parameters should be consistent with the design selection.

[0076] When materials and equipment are brought to the site, they must be strictly inspected and accepted. Check the appearance quality of the ventilation duct to ensure that there are no obvious defects such as deformation, scratches, rust, etc., and the galvanized layer is uniform and not falling off. Power on the fan for a trial run to check whether the fan's rotation direction, speed, noise, etc. are normal, and check whether the specifications, models, and materials of the air valve and air outlet meet the requirements, and whether the random accessories are complete. Unqualified materials and equipment must be removed from the site to ensure construction quality.

[0077] 3. Construction site preparation

[0078] The construction site shall be thoroughly cleaned, obstacles irrelevant to the construction of the ventilation system shall be removed, and the site shall be leveled to provide sufficient space for the construction equipment and material stacking. A special material stacking area shall be set up, the area of ​​which shall be determined according to the scale of the project, generally not less than 100 square meters, and measures such as moisture-proof, rain-proof, and fire-proof shall be taken, such as building rain shelters and equipping fire extinguishers.

[0079] According to construction needs, build scaffolding that meets safety standards. The distance between the vertical poles of the scaffolding should not exceed 1.5m, the distance between the horizontal poles should not exceed 1.8m, and the scissor bracing should be set in accordance with relevant regulations to ensure the stability of the scaffolding. At the same time, set up obvious safety warning signs at the construction site, such as "No fireworks" and "Be careful of falling", and equip with necessary safety protection supplies, such as safety helmets, safety belts, safety nets, etc., and provide safety education and training for construction personnel to ensure a safe and orderly construction process.

[0080] (IV) Ventilation duct processing and treatment

[0081] 1. Cutting and bending

[0082] Use a grinding wheel cutter to cut the ventilation duct. The cutting speed should be controlled during cutting to ensure that the pipe mouth is flat. The flatness deviation of the pipe mouth after cutting does not exceed ±0.5mm. For pipes with larger diameters, a plasma cutter can be used to improve cutting efficiency and quality.

[0083] Use a bending machine to bend the pipe, set the bending angle according to the design requirements, and control the bending angle deviation within ±1°. Pay attention to the selection and adjustment of the mold during the bending process to ensure that there are no wrinkles or deformation at the bend of the pipe.

[0084] 2. Punching and anti-corrosion

[0085] According to the installation spacing of the supports and hangers (generally no more than 3m) and the installation requirements of sensors and other components, use an electric drill to drill holes in the pipeline, and the hole diameter deviation should not exceed ±1mm. After drilling, use a file to clean the burrs in the hole to prevent damage to the pipeline and affect subsequent installation.

[0086] The processed ventilation ducts are treated with anti-corrosion and anti-rust treatment. When hot-dip galvanizing is used, the thickness of the galvanized layer should meet the national standard requirements, generally not less than 85μm. For the parts that damage the galvanized layer due to on-site cutting, drilling, etc., they should be repainted in time, and anti-rust paint with a color similar to the galvanized layer and strong adhesion should be selected.

[0087] (V) Ventilation duct installation

[0088] 1. Installation of seismic support and hanger

[0089] Calculate the spacing and specifications of the supports and hangers according to the direction and weight of the pipeline. The spacing between supports and hangers for horizontal pipelines should not be greater than 3m, and the spacing between supports and hangers for vertical pipelines should not be greater than 4m. Supports and hangers are made of angle steel or channel steel.

[0090] Install the support and hanger on the structural beam or concrete wall and fix it with expansion bolts. The specification of the expansion bolts should be no less than M10. During installation, ensure that the support and hanger are firm and reliable, with a horizontal deviation not exceeding ±0.5mm / m and a vertical deviation not exceeding ±0.5mm / m. Use cross arms for installation, use reinforcements for installation in the lateral and longitudinal directions, and set up vertical hangers for installation.

[0091] 2. Pipeline connection

[0092] When connecting flanges, weld the flanges to the pipes firmly. The welds should be flat without defects such as weld bumps and pores. Place 3-5mm thick closed-cell sponge rubber gaskets between the flanges, tighten the bolts symmetrically, and the tightening torque should comply with the requirements of the equipment installation manual, generally 10-15N·m, to ensure that the flanges are tightly connected without leakage.

[0093] 3. Duct pre-assembly

[0094] Duct assembly: transport the finished products to the installation site, arrange them according to the numbers, and start assembly after they are correct;

[0095] Connection: After each section is connected, apply sealant around the flange edges. Use 3-5mm thick closed-cell sponge rubber sheet gaskets between the flanges and connect them with spring clips. The spacing between the spring clips should not exceed 150mm, and the air ducts should be connected to about 20m.

[0096] 4. Horizontal installation of air duct

[0097] Lift the assembled horizontal duct onto the hanger using an electric hydraulic lift or a portable lift. Place the assembled duct on the lift, lift the duct to about 200mm higher than the final elevation, pull the horizontal line to tighten the bracket cross arm, place the duct on the cross arm, and determine the installation height.

[0098] 5. Duct riser installation

[0099] The method of installing, connecting and fixing section by section from bottom to top is adopted;

[0100] When installing the vertical pipe, it is important to note that a horizontal installation distance of 1-1.5m must be reserved at the interface with the horizontal pipe when installing the horizontal pipe, and the air duct must be pre-assembled to a length of 4m.

[0101] Among them, the construction principles of air duct installation are: the pipeline avoidance requirement is that small air ducts give way to large air ducts; the tapering and expanding pipes of the equipment inlet and outlet pipe sections should maintain a certain length and not be too short; fully understand the layout of the air outlet; the detachable openings on the air duct must not be set on the wall or floor; the flange of the air duct should avoid the position of beams and walls; all fire-fighting valves and regulating valves are installed in positions that are convenient for maintenance.

[0102] 6. Fan coil installation

[0103] The fan coil units should be subjected to water pressure test one by one, with the test intensity being 1.5 times of the working pressure. After the pressure is set, observe for 2-3 minutes to ensure there is no leakage. The connection of the fan coil units can only be carried out after the piping system has been flushed.

[0104] The hanging bracket should be installed firmly and in the correct position. The hanging rod should not swing freely. The hanging rod and the fan coil should be fastened with double nuts for leveling and alignment. The fan coil and the inlet and outlet ducts should be equipped with flexible joints according to the design requirements to prevent vibration and noise.

[0105] (VI) Fan installation

[0106] 1. Before installing the fan, the equipment foundation should be fully inspected according to the design drawings, product samples or the actual fan, and the dimensional requirements should be verified.

[0107] 2. Before installing the fan, scrape out the rough surface on the foundation so that the secondary poured concrete or cement mortar can be tightly combined with the foundation.

[0108] (VII) Water pump installation

[0109] 1. Installation of shock absorber

[0110] The water pump vibration reduction in this project adopts the installation method of vibration reduction pedestal plus spring vibration damper. The spring vibration damper is sized and positioned according to the water pump technical sample and installed on the water pump foundation, and then the vibration reduction pedestal is connected to the spring vibration damper.

[0111] 2. Water pump installation

[0112] Hoist the water pump and transport it to the pump room. Use the gantry to lift the water pump to the top of the foundation, align the bolt holes between the water pump and the base, slowly lower the water pump, connect the water pump to the vibration-damping base, adjust the levelness of the water pump, and check and calibrate the concentricity of the coupling.

[0113] 3. Pipeline connection

[0114] When connecting the pipeline, check the alignment of the pipeline and the water pump interface, install the pipeline and valve first, and then install the flexible joint. The flexible joint should be connected in a free state, and the pipeline must have independent support, and the force must not be transferred to the flexible joint and the water pump.

[0115] During the above installation process, select an air filter device with appropriate filtration efficiency according to the platform environment. The installation frame is easy to disassemble and install, has good sealing, is cleaned or replaced regularly, and is updated in time when the final resistance is reached.

[0116] After installation, use an air volume measuring instrument (such as a thermal anemometer or a Pitot tube) to measure the air volume at the air outlet during system debugging. Take the average value of no less than 3 measurement points for each air outlet. The total ventilation volume meets the design requirements within ±10%. At the same time, measure the fan inlet and outlet wind pressure.

[0117] In the subsequent maintenance plan, daily inspections will check the fan's operating sound, vibration, etc. every day, regular maintenance will perform fan bearing lubrication and other operations every quarter, and annual inspections will comprehensively test equipment performance, electrical insulation resistance (not less than 0.5MΩ), etc.

[0118] During the construction process, a power supply interface that meets the requirements is reserved for the lighting system, and a data transmission interface such as RS485 or Ethernet is reserved for the monitoring system to facilitate information sharing and collaborative work.

[0119] Through the above-mentioned precise preliminary investigation and reasonable system planning, this application determines the ventilation layout and equipment selection in combination with the actual situation of the platform, which can effectively improve the efficiency of the ventilation system and avoid physical discomfort of passengers in the platform area due to weather reasons (for example, in a hot environment, natural ventilation alone cannot dispel the dryness caused by high temperature. Through the ventilation design of the platform canopy, cold air can be blown under the canopy to improve the physical sensation. At the same time, in a cold environment, warm air can be blown to drive away the cold. In a stuffy environment, the blowing of cool air can improve the passenger experience, etc.), ensure uniform ventilation in all areas of the platform, improve air quality, provide passengers with a more comfortable waiting environment, and meet the heat dissipation and other requirements of equipment operation. During the construction process, strict and standardized pipeline processing and installation processes, as well as high-quality equipment installation, ensure the tightness of the connection and structural stability of the ventilation system, reduce air leakage, vibration and other problems, thereby extending the service life of the system and reducing maintenance costs. Interfaces with other platform facilities are reserved to facilitate system integration and collaborative work, improve the overall intelligent management level of the platform, realize information sharing and linkage control, and improve operational management efficiency.

[0120] The above embodiments are only used to illustrate the specific embodiments of the present invention and are not limited thereto. For those skilled in the art, various similar deformations and changes can be made according to the concept of the present invention, and these deformations and changes should be regarded as the protection scope of the present invention.

Claims

1. A construction process for a ventilation system for platform canopy construction, characterized in that: The following steps are involved: S1. Preliminary research: Detailed mapping of the platform canopy structure, analysis of platform personnel flow distribution, train operation patterns and local climate conditions, comprehensive assessment of ventilation needs, determination of the overall layout of the ventilation system, planning of air inlet and outlet locations and ventilation duct directions; S2. Equipment selection: Based on the calculation results of ventilation demand, select a fan that meets the air volume and air pressure requirements and is energy-efficient and efficient. At the same time, select an air valve and an appropriate air outlet with high adjustment accuracy, good sealing and weather resistance; S3. Construction preparation: Draw accurate construction drawings and strictly review them to ensure they are correct; purchase high-quality materials and equipment according to the drawings and conduct strict inspections upon arrival; clean up the construction site, build necessary temporary facilities, and take safety precautions; S4. Ventilation duct processing: accurately cut and bend ventilation ducts according to design requirements, ensure accurate size and shape, and accurately punch holes at specified locations; S5. Ventilation duct installation: Install the duct according to the design direction and the spacing between supports and hangers, use an appropriate connection method to ensure that the connection is tight and firm, and install supports and hangers to ensure the stability of the duct; S6. Fan and air valve installation: Install the fan firmly on the foundation, ensure horizontality and verticality, and achieve tight and flexible connection with the ventilation duct; install the air valve in a convenient place to ensure flexible opening and closing, precise adjustment, and the material meets the weather resistance requirements; S7. Installation of air filter: Select appropriate filter and install it in a reasonable position to ensure good sealing with the pipeline, easy to clean and replace, and perform regular maintenance to ensure filtering effect; S8. System debugging: After completing the installation, conduct a comprehensive inspection, start the fan to test ventilation volume, wind pressure and other parameters, and make optimization adjustments based on the design requirements to ensure stable operation of the system.

2. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: Before installing the ventilation duct, the duct shall be pre-processed, including cutting, bending and punching operations, to ensure that the size and shape of the duct meet the design requirements, and the duct shall be treated with anti-corrosion and anti-rust.

3. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: The connection of the ventilation duct adopts a connection method with good sealing performance, and uses sealing materials at the connection to ensure the airtightness of the ventilation system.

4. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: When installing the fan, ensure that the foundation of the fan is firm, the horizontality and verticality meet the installation standards, and the connection between the fan and the ventilation duct is tight without vibration and air leakage.

5. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: The air valve is installed in a position that is easy to operate and adjust. The air valve is flexible to open and close, can accurately control the ventilation volume, and the material of the air valve has good weather resistance and strength.

6. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: An air filter device is installed in the ventilation system to effectively filter pollutants in the air, and the filter device is easy to clean and replace.

7. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: Debug the entire ventilation system to ensure that it operates stably and meets the ventilation requirements of the platform.

8. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: Establish a maintenance plan for the ventilation system, regularly inspect, clean and maintain ventilation equipment, pipes, and filters to extend the service life of the ventilation system.

9. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: The design and construction of the ventilation system complies with relevant building codes and safety standards to ensure that there are no safety hazards to personnel and facilities during the use of the platform.

10. The construction process of a ventilation system for platform canopy construction as claimed in claim 1, characterized in that: Interfaces with other station facilities are reserved in the ventilation system to achieve system integration and collaborative work.

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