Anti-seepage and anti-condensation composite color steel roof of large factory building and construction method of anti-seepage and anti-condensation composite color steel roof

Abstract

The invention discloses an anti-seepage and anti-condensation composite color steel roof of a large factory building and a construction method thereof. Purlin supports are vertically welded with steel roof truss girders, and purlins are fixedly mounted on the purlin supports in the direction perpendicular to the drainage direction of a steel structure roof; then layered construction of a roof system is carried out, a bottom layer profiled steel sheet is laid in the direction from a cornice to a ridge, and 360-degree seaming and edge locking are adopted between plate panels; a vapor-proof layer is laid on the upper portion of the bottom-layer profiled steel sheet, and vapor-proof layers are laid at the joints of the ridge and the cornice in a double-layer mode; a heat preservation layer is laid on the vapor barrier layer in a layered and staggered mode, and the lap joint position is fixed through a fixing piece; the waterproof breathable layer is bonded with the heat preservation layer through an adhesive tape, and an additional layer is additionally arranged at a node; the top layer profiled metal plate is laid on the upper portion of the waterproof breathable layer and fixedly connected with the fixing support, and the top layer profiled metal plate achieves 360-degree seaming and edge locking through mechanical seaming; by integrating the functions of heat preservation, water prevention, corrosion prevention and condensation prevention, the service life of the building roof system is remarkably prolonged, and the safety performance of the building roof system is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of factory building construction technology, and more specifically, to a waterproof and condensation-resistant composite color steel roof for large factory buildings and its construction method. Background Technology

[0002] In the construction of large steel structure factory buildings, color-coated steel sheet roofing is widely used in industrial plants due to its advantages such as weight, ease of processing, and fast construction speed. Traditional construction of color-coated steel sheet roofing in steel structure factory buildings generally adopts a single-layer functional superposition mode. The construction process is as follows: purlin welding and fixing, laying a single layer of glass wool insulation, applying ordinary asphalt waterproof membrane, and mechanically fixing the color steel sheet. Joint treatment often uses 180° semi-interlocking connections combined with ordinary galvanized steel sheet edge flashing. The materials used are mainly single-layer 100-150mm glass wool, asphalt waterproof membrane, and ordinary self-tapping screws. Traditional construction techniques have the following technical defects: 1. Improper handling of details: Leaks are easily caused by poor sealing at the joints of color-coated steel sheets and the connection between the roof and the wall. Especially in factories with constant temperature and humidity requirements, condensation problems seriously affect the production environment.

[0003] 2. Single insulation and waterproofing functions: A single insulation layer or waterproofing layer is insufficient to cope with the accumulation of condensation caused by temperature differences, resulting in a decrease in insulation performance.

[0004] 3. Insufficient wind resistance: The interlocking seam connection is not reliable enough and is prone to loosening under strong winds, which may cause the roof to overturn.

[0005] 4. Poor adaptability to sandstorm climate: The lack of targeted protective design against sandstorm erosion leads to reduced durability of the roofing system. Summary of the Invention

[0006] The purpose of this invention is to provide a waterproof and condensation-resistant composite color steel roof for large factory buildings and its construction method, so as to solve the problems of leakage, condensation, heat preservation attenuation and insufficient wind resistance of traditional roofs.

[0007] To achieve the above objectives, according to one aspect of the present invention, a large-scale composite color steel roof for waterproof and condensation-resistant factory buildings is provided, comprising main purlins, a bottom profiled steel sheet, a vapor barrier, a thermal insulation layer, a waterproof and breathable layer, and a top profiled metal sheet; the main purlins are fixedly installed on the purlin supports of the main beam of the steel roof truss, the bottom profiled steel sheet is fixedly laid on top of the main purlins, and additional purlins are connected to the top of the main purlins, with fixed supports connected to the top of the additional purlins; the vapor barrier, thermal insulation layer, waterproof and breathable layer, and top profiled metal sheet are laid sequentially from the bottom profiled steel sheet upwards, and the top profiled metal sheet is connected to the fixed supports.

[0008] In a preferred embodiment, a heat insulation block is provided inside the fixed bracket, and the heat insulation block is fixed at the connection between the additional purlin and the fixed bracket.

[0009] In a preferred embodiment, the main purlin is perpendicular to the main beam of the steel roof truss, with the included angle deviation controlled within ±1° and the positional deviation ≤5mm.

[0010] In a preferred embodiment, the vapor barrier is made of self-adhesive polymer-modified bitumen waterproof membrane.

[0011] In a preferred embodiment, the insulation layer is selected with a thermal conductivity ≤0.036W / m·K and a density of 24kg / m³. 3 Insulating cotton.

[0012] In a preferred embodiment, the waterproof and breathable layer is made of thermoplastic polyolefin waterproof membrane.

[0013] According to another aspect of the present invention, a construction method for a large-scale composite color steel roof for waterproofing and condensation prevention is provided, comprising: Step 1: Surveying and Setting Out and Construction Preparation; Using a total station, all control axes of the roof were located, and the center lines and edge control lines of the main purlins, auxiliary purlins, and top corrugated metal panels were marked out. Step 2: Install the main purlins; Weld the purlin brackets vertically to the main beams of the steel roof truss, and fix the purlins perpendicular to the drainage direction of the steel roof structure onto the purlin brackets; control the perpendicularity of the main purlins and the main beams of the steel roof truss, with an included angle deviation ≤1° and a position deviation ≤5mm; Step 3: Layered construction of the roofing system; Install the bottom layer of profiled steel sheet, laying the bottom layer of profiled steel sheet from the eaves to the ridge, with 360° interlocking edges between the sheet panels; A vapor barrier is laid on the top of the bottom profiled steel sheet, and a double vapor barrier is laid at the ridge and eaves joints. Lay the insulation layer, and lay the insulation layer in staggered layers on the vapor barrier layer. The surface flatness error of the insulation layer is ≤5mm. Use fasteners to fix the overlaps, and the fastener density is ≥3 points / square meter. Lay a waterproof and breathable layer, which is bonded to the insulation layer with adhesive strips. Add a 500mm wide additional layer at the joints, and the overlap joints are ≥500mm from the edge of the joint. Install the top corrugated metal sheet, which is laid on top of the waterproof and breathable layer and fixedly connected to the bracket. The top corrugated metal sheet uses mechanical interlocking to achieve 360° interlocking edge locking with an interlocking depth ≥20mm. Step 4: Detailed structural treatment and acceptance.

[0014] As a preferred embodiment, in step three, when installing the top-layer profiled metal sheet, the top-layer profiled metal sheet extends into the gutter by 70-120mm, and the eaves are covered with L-shaped edge-sealed color steel sheet, which is fixed by alternating self-tapping screws and rivets.

[0015] In a preferred embodiment, step four includes: Immediately after the roof panels are installed, the edges and corners should be finished, with the folded edges facing the direction of water flow. Strengthen the eaves, skylights, and gable flashing joints, with an additional layer overlap width ≥ 500mm; Perform reliability checks on connector fasteners, quality checks on interlocking seams, and sealing checks. Conduct wind pressure resistance test and water spray test, with the water spray test lasting no less than 2 hours.

[0016] In a preferred embodiment, the top-layer profiled metal sheet is installed using a profiled metal sheet installation device. The profiled metal sheet installation device includes a support frame, a ramp plate, and a bracket. The support frame is a rectangular frame formed by splicing multiple metal rods. The ramp plate is located on the upper part of the support frame, and the surface of the ramp plate is provided with strip-shaped groove structures corresponding to the protrusions on the top-layer profiled metal sheet. The ramp plate can rotate relative to the support frame to change the tilt angle. The bracket is fixed to the bottom of the support frame.

[0017] This invention integrates thermal insulation, waterproofing, corrosion resistance, and anti-condensation functions to form a unified, multi-dimensional protective construction method. The core technology lies in simultaneously addressing the durability issues of color-coated steel roofs caused by temperature deformation, corrosive media erosion, rainwater penetration, and condensation through material composites and process optimization. This significantly improves the service life and safety performance of building roof systems, while meeting the dual demands of modern industrial buildings for energy conservation, environmental protection, and structural safety. This invention provides large industrial plants with a high-performance, low-cost roofing solution that integrates thermal insulation, waterproofing, anti-condensation, and wind and sand resistance.

[0018] The waterproof and anti-condensation composite color steel roof for large factory buildings and its construction method disclosed in this invention can be applied to industrial or civil building fields, especially suitable for large color steel roof projects such as steel structure factories, warehouses, and commercial buildings, particularly for industrial factory construction under high humidity and windy and sandy climate conditions. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the structure of the anti-seepage and anti-condensation composite color steel roof for large factory buildings disclosed in this invention; Figure 2 This is a process flow diagram of the construction of a large-scale composite color steel roof for waterproofing and condensation prevention disclosed in this invention. Figure 3 This is a schematic diagram of the structure of the profiled metal sheet mounting device disclosed in this invention.

[0021] In the diagram, 1. Main purlin, 2. Bottom profiled steel sheet, 3. Additional purlin, 4. Vapor barrier, 5. Thermal insulation layer, 6. Waterproof and breathable layer, 7. Insulation block, 8. Fixed bracket, 9. Top profiled metal sheet, 10. Support frame, 11. Sloping plate, 12. Bracket, 13. Adjustment device. Detailed Implementation

[0022] The basic concept of this invention is to provide a "five-layer collaborative - full-node sealing" construction system for steel structure factory roofing suitable for high humidity and windy sand environments. This invention constructs a five-layer composite structure consisting of a profiled steel sheet bearing plate, a polymer-modified bitumen waterproof membrane vapor barrier, double-layer staggered glass wool, a thermoplastic polyolefin waterproof membrane (P-type) self-adhesive waterproof and breathable membrane, and an outer profiled metal sheet. Through gradient matching of material properties, it achieves an integrated function of "water vapor barrier, high-efficiency thermal insulation, and breathable anti-condensation." Actual measurements show an 85% reduction in condensation area in winter and a 12°C reduction in the inner surface temperature in summer. A 360° standing seam interlocking system, combined with an L-shaped edge-wrapping structure, forms a triple protection of "mechanical interlocking, colloidal sealing, and metal cladding," achieving a wind pressure resistance of 5.0 kPa and an airtightness of ≤1.0 m³ / (m²·h·Pa). A "three-dimensional laser calibration + mobile panel fabrication + five-stage acceptance" process is established. Through millimeter-level positioning with a total station, on-site mobile molding station, and four-stage quality control, it systematically solves technical problems such as high leakage rates and rapid insulation degradation in traditional construction, providing a full life-cycle roofing solution for industrial buildings in complex climatic environments.

[0023] The present invention provides a typical embodiment of a waterproof and condensation-resistant composite color steel roof for large factory buildings, comprising a main purlin 1, a bottom profiled steel sheet 2, a vapor barrier 4, a thermal insulation layer 5, a waterproof and breathable layer 6, and a top profiled metal sheet 9.

[0024] like Figure 1 As shown, the main purlin 1 is fixedly installed on the purlin support of the main beam of the steel roof truss. The bottom profiled steel sheet 2 is fixedly laid on the top of the main purlin 1. The top of the main purlin 1 is connected to the additional purlin 3, and the top of the additional purlin 3 is connected to the fixed bracket 8. From the bottom profiled steel sheet 2 upwards, the vapor barrier layer 4, the thermal insulation layer 5, the waterproof and breathable layer 6 and the top profiled metal sheet 9 are laid in sequence. The top profiled metal sheet 9 is connected to the fixed bracket 8.

[0025] In a preferred embodiment, a heat insulation block 7 is provided inside the fixed bracket 8. The heat insulation block 7 is fixed at the connection between the additional purlin 3 and the fixed bracket 8. The core function of the heat insulation block 7 is to block the conduction of heat bridges, ensure the integrity of the insulation system, and at the same time help improve the structural stability and waterproof sealing.

[0026] Another typical embodiment of the present invention provides a construction method for the waterproof and condensation-resistant composite color steel roof of a large factory building as described in the above embodiments. For example... Figure 2 As shown, the construction steps include: W1 roof measurement and layout and construction preparation, W2 main purlin installation, W3 roof system layer construction, and W4 detailed structural treatment and acceptance.

[0027] W1 Roof Measurement and Layout and Construction Preparation The construction of composite color steel roofs requires precise measurement and layout as a foundation, and through systematic construction preparation and strict process control, ensures that core performance aspects such as waterproofing, thermal insulation, and structural safety meet standards. For example... Figure 2 As shown, this step includes W11-W13.

[0028] The W11 total station is used to establish the baseline, and all control axes on the factory floor are located using the total station.

[0029] The W12 purlin axis is marked out precisely according to the control axis, marking out the centerline and edge control lines of all purlins (main purlins and auxiliary purlins) on the floor, as well as the roof slab. After accurately marking the installation position of the main purlin on the welded iron parts, ensure that the axis of main purlin 1 is completely parallel to the vertical axis of the building.

[0030] W13 lays out the baseline of the bottom profiled steel sheet 2. After all control lines are laid out, the spacing of all control lines is checked again to prevent errors. The baseline error is controlled within ±5mm.

[0031] Before construction, the entire roof needs to be measured, laid out, and arranged. In particular, the rib direction of the bottom profiled steel sheet 2 must be perpendicular to the main purlin 1 to ensure installation accuracy.

[0032] The bottom profiled steel sheet 2 is made using an on-site forming process. A portable forming machine is placed near the roof axis, and three production points are set up to reduce the material transfer distance and improve construction efficiency.

[0033] W2 main purlin installation The installation process for main purlin 1 includes construction preparation, hoisting, handling, positioning, installation, deviation adjustment, and concealed acceptance. The accuracy of the position must be strictly verified at each stage. For example... Figure 2 As shown, this step includes W21-W23.

[0034] For W21 positioning and foundation treatment, according to the design drawings, mark the main purlin installation positioning lines on the steel beam to determine the purlin support position. Weld the purlin support perpendicularly to the steel beam flange (angle 90°±1°), first perform symmetrical spot welding, and after checking that the angle is qualified, perform full welding, ensuring the weld is full and without defects.

[0035] For the W22 hoisting and fixing connection, during the installation of the main purlins, the main purlin 1 is first hoisted horizontally to the installation position using a crane and manual labor. For extra-long purlins, a "one hook, multiple hoisting" method is used, ensuring secure binding. The main purlin 1 is installed perpendicular to the drainage direction of the steel structure roof, fixed to the purlin support of the main beam of the steel roof truss, adjusted in position using shims, and finally secured with bolts.

[0036] The main purlin 1 is perpendicular to the main steel beam. After construction, the main purlin 1 is on the roof section line. The perpendicularity of the main purlin 1 and the main steel roof truss beam is controlled, with the included angle deviation ≤1° and the position deviation within 5mm.

[0037] W23 Quality Inspection and Finishing Process: After all control lines are laid out, the spacing of all control lines is checked again to prevent errors. The baseline error is controlled within ±5mm.

[0038] W3 Roofing System Layered Construction The layered construction of the roofing system must strictly follow the construction sequence and technical points to ensure that each layer functions effectively. For example... Figure 2 As shown, this step includes W31-W37.

[0039] W31 Material preparation and corrugated tile (bottom profiled steel sheet and top profiled metal sheet) processing. After the main purlin 1 is installed, the 0.8mm bottom profiled steel sheet 2 is first formed on site. A portable forming machine is used to set up three longitudinal production points along the AD axis / 1-36 axis of the factory area. The forming machine is moved with the construction surface to reduce the transfer of roofing materials.

[0040] Select the bottom profiled steel sheet and top profiled metal sheet according to the design requirements. Check the specifications, coating quality, and edge neatness to ensure compliance with national standards (such as GB / T 12754). Select the mold according to the required waveform and install it on the roll forming machine. Adjust the pressure, speed, and forming passes (usually 3-5 passes). Press a sample to verify the waveform dimensions; the wave height and wave pitch errors should be ≤ ±1mm. Align the center of the color roll with the center line of the roll forming machine, start the equipment to continuously press the corrugated tiles, and set the cutting length, with an error of ≤ ±2mm. After reaching the set value, it will automatically cut, with a smooth end face without burrs.

[0041] Installation of W32 bottom profiled steel sheet 2 and additional purlins 3.

[0042] Check the flatness of the main purlin 1, with an error ≤ L / 1000 and ≤ 10mm, and mark the control line at the eaves edge. Before installing the 0.8mm bottom profiled steel sheet 1 and the additional purlins 3, complete the overall measurement, layout, and arrangement to ensure that the rib direction of the bottom profiled steel sheet 1 is perpendicular to the main purlin 1.

[0043] A 0.8mm thick bottom profiled steel sheet 2 is laid from the eaves towards the ridge. The first sheet is precisely positioned using fixed brackets and additional purlins 3. The mother rib of the bottom profiled steel sheet 2 faces upward, and the sheets are interlocked with 360° interlocking edges. The spacing between fixed brackets is ≤1.5m, and the spacing is increased to ≤1.0m at the eaves. The additional purlins 3 (100×50×20×1.5mm) and high-strength aluminum alloy T-code supports are installed simultaneously.

[0044] W33 vapor barrier 4 is constructed using self-adhesive polymer-modified bitumen waterproof membrane to block indoor moisture.

[0045] Lay 0.6mm self-adhesive polymer-modified bitumen waterproof membrane with a horizontal overlap of ≥5cm. Use a dense double layer at the ridge and eaves joints. Repair any damaged areas promptly with patches of the same material to avoid omissions.

[0046] For the construction of W34 insulation layer 5, the insulation layer 5 should be selected with a thermal conductivity ≤0.036W / m·k and a density of 24kg / m³. 3 Insulating cotton.

[0047] Lay 100mm thick glass wool in staggered layers, with a moisture-proof facing underneath. The horizontal overlap should be ≥100mm. Use a stapler to fix the overlap, with a fixing density of ≥3 points / square meter. Use a 2m straightedge to check the surface of the insulation layer. The flatness error should be ≤5mm, ensuring that the insulation layer is flat without folds, wrinkles, or hollow areas.

[0048] The W35 waterproof and breathable layer 6 is constructed using thermoplastic polyolefin waterproof membrane, which comes with its own adhesive strip.

[0049] Lay 1.8mm thermoplastic polyolefin waterproof membrane (P type), and use its built-in adhesive strip to tightly adhere it to the insulation layer. Add an additional 500mm wide layer at the joints, and ensure that the overlap joints are ≥500mm from the edge of the joint to enhance waterproof performance.

[0050] The installation of W36 top-layer profiled metal panels 9 involves the following construction process: layout, positioning, edge interlocking, and edge trimming. The edge interlocking process uses mechanical interlocking technology to ensure wind pressure resistance, air tightness, and water tightness.

[0051] Lay out the control axis and install the 0.6mm outer corrugated metal sheet 9, with its end overlapping the control axis; use mechanical interlocking technology to complete the 360° interlocking edge, and press the overlapping edge tightly against the previous sheet, with an interlocking depth ≥20mm. This is a key step in roof waterproofing.

[0052] When connecting the gutter, the top-layer profiled metal sheet 9 should extend into the gutter for a length of ≥50mm (usually 70-120mm). The eaves edge sealing structure should be covered with L-shaped edge-sealed color steel sheet, and fixed alternately with self-tapping screws and rivets at intervals of ≤300mm to solve the problem of waterproof condensation.

[0053] Adopting such Figure 3 The profiled metal sheet mounting device shown installs the top profiled metal sheet 9. The profiled metal sheet mounting device includes: a support frame 10, a ramp plate 11, and a bracket 12.

[0054] The support frame 10 is a rectangular frame formed by splicing multiple metal rods, providing stable support and ensuring that there is no shaking or displacement during installation.

[0055] The ramp 11 is installed on the upper part of the support frame 10 to provide a ramp for materials or personnel to go up and down. The surface of the ramp 11 is provided with strip-shaped grooves that correspond to the protrusions on the top layer of the profiled metal sheet 9, which not only facilitates the placement and movement of the profiled metal sheet, but also increases the friction of the contact surface to prevent slippage.

[0056] The ramp 11 is inclined and can rotate relative to the support frame 10 to change the inclination angle. An adjustment device 13 is provided at the connection between the ramp 11 and the support frame 10, and the angle of the ramp 11 can be adjusted manually or hydraulically.

[0057] The stable support frame 10 and the precisely adjustable angle structure ensure the accuracy of the top-layer profiled metal plate 9 during installation, avoiding splicing errors caused by tilting.

[0058] The bracket 12 is fixed to the bottom of the support frame 10 to fix the entire device to the ground or construction platform and prevent the device from shifting during installation.

[0059] This device is applicable to different color steel plate installation scenarios. By adjusting the angle of the ramp, it can meet the construction needs of profiled metal sheets with different roof slopes and different installation positions, thus improving the versatility of the device.

[0060] For the W37 node treatment and acceptance, an additional 500mm wide waterproof layer should be added at the ridge and gable flashing. The insulation layer 5 should be tightly filled. Before installing the top-layer profiled metal sheet 9, the ridge elevation and purlin slope should be checked, with an error ≤5mm. During quality acceptance, the wind pressure resistance of the seam should be ≥5.0kPa, the air tightness ≤0.5m³ / m²·h, and the water tightness ≥5.0kPa. A water spray test should be conducted for 2 hours without leakage.

[0061] This step mainly involves the installation process of the roofing system. First, the construction of each layer of the roofing system is carried out systematically. It is important to emphasize that the quality of the seam sealing directly affects the waterproof performance of the roof. A special seam sealing machine must be used for construction. The moisture-proof face of the insulation layer 5 should face the indoor side to avoid condensation accumulation. Finally, all overlaps must be coated with matching sealant, and the joints must be reinforced.

[0062] W4 Detailed Construction and Acceptance Detailed structural treatment and acceptance are crucial steps in ensuring the performance of the roofing system. This step mainly involves the detailed structural treatment and acceptance procedures, first reinforcing the details, then conducting a comprehensive physical inspection, and finally testing to ensure the system meets design and specification requirements. Figure 2 As shown, this step includes W41-W43.

[0063] For W41 detailed structural treatment, immediately after the top-layer profiled metal sheet 9 is installed, the edge finishing work should be carried out to ensure that the folded edge direction is in the direction of water flow, in order to maintain the integrity, firmness and waterproof performance of the roof. Detailed treatment is required for roof eaves, skylights, gable flashing and other detailed nodes. Specifically, additional layers should be added to the vapor barrier 4 and waterproof breathable layer 6 at these nodes, and the overlap joint should be ≥500mm from the edge of the node. At the same time, it must be ensured that there are no gaps in the insulation layer.

[0064] The W42 quality-specific inspection involves a comprehensive check of the reliability of all connectors before project acceptance to ensure secure connections. A meticulous inspection of the seam quality of the panels is conducted to guarantee tight seams and secure locking. A rigorous check of the sealing details is performed to ensure no leakage or condensation, thereby guaranteeing the roof's waterproofing performance.

[0065] W43 Acceptance and Performance Testing: After construction is completed, a concealed acceptance inspection is required to check the hidden parts of the roofing system and ensure that the construction quality meets the design requirements. Overall performance testing is then conducted, including wind pressure resistance tests and water spray tests, to verify the roofing system's performance in actual use and ensure it meets design requirements.

[0066] According to actual test results, the anti-seepage and anti-condensation composite color steel roof for large factory buildings provided by this invention maintains zero leakage under sandstorm weather conditions, and its 360° interlocking edge wind pressure resistance reaches level 11. The bidirectional water vapor balance layer, combined with a constant temperature and humidity system, keeps the indoor relative humidity stable at 55%±5%, demonstrating significant anti-condensation effects. The multi-layer composite structure effectively resists temperature difference deformation, and there is no insulation layer failure or loosening of the interlocking edges during use. On-site processing using a portable forming machine reduces transportation losses by at least 30% and shortens the construction period by approximately 15%.

[0067] The scope of protection claimed by this invention is not limited to the specific embodiments described above. For those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A composite color steel roof for large factory buildings that is waterproof and condensation-resistant, characterized in that: It includes main purlins, a bottom profiled steel sheet, a vapor barrier, a thermal insulation layer, a waterproof and breathable layer, and a top profiled metal sheet; the main purlins are fixedly installed on the purlin supports of the main beam of the steel roof truss, the bottom profiled steel sheet is fixedly laid on top of the main purlins, the top of the main purlins is connected to additional purlins, and the top of the additional purlins is connected to a fixed bracket; from the bottom profiled steel sheet upwards, the vapor barrier, thermal insulation layer, waterproof and breathable layer and the top profiled metal sheet are laid in sequence, and the top profiled metal sheet is connected to the fixed bracket.

2. The anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 1, characterized in that: The fixed bracket is equipped with a heat insulation block inside, and the heat insulation block is fixed at the connection between the additional purlin and the fixed bracket.

3. The anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 1, characterized in that: The main purlin is perpendicular to the main beam of the steel roof truss, with the included angle deviation controlled within ±1° and the positional deviation ≤5mm.

4. The anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 1, characterized in that: The vapor barrier layer is made of self-adhesive polymer-modified bitumen waterproof membrane.

5. The anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 1, characterized in that: The insulation layer is selected with a thermal conductivity ≤0.036W / m·K and a density of 24kg / m³. 3 Insulating cotton.

6. The anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 1, characterized in that: The waterproof and breathable layer is made of thermoplastic polyolefin waterproof membrane.

7. The construction method of the anti-seepage and anti-condensation composite color steel roof for large factory buildings according to any one of claims 1-6, characterized in that, include: Step 1: Surveying and Setting Out and Construction Preparation; Using a total station, all control axes of the roof were located, and the center lines and edge control lines of the main purlins, auxiliary purlins, and top corrugated metal panels were marked out. Step 2: Install the main purlins; Weld the purlin brackets vertically to the main beams of the steel roof truss, and fix the purlins perpendicular to the drainage direction of the steel roof structure onto the purlin brackets; control the perpendicularity of the main purlins and the main beams of the steel roof truss, with an included angle deviation ≤1° and a position deviation ≤5mm; Step 3: Layered construction of the roofing system; Install the bottom layer of profiled steel sheet, laying the bottom layer of profiled steel sheet from the eaves to the ridge, with 360° interlocking edges between the sheet panels; A vapor barrier is laid on the top of the bottom profiled steel sheet, and a double vapor barrier is laid at the ridge and eaves joints. Lay the insulation layer, and lay the insulation layer in staggered layers on the vapor barrier layer. The surface flatness error of the insulation layer is ≤5mm. Use fasteners to fix the overlaps, and the fastener density is ≥3 points / square meter. Lay a waterproof and breathable layer, which is bonded to the insulation layer with adhesive strips. Add a 500mm wide additional layer at the joints, and the overlap joints are ≥500mm from the edge of the joint. Install the top corrugated metal sheet, which is laid on top of the waterproof and breathable layer and fixedly connected to the bracket. The top corrugated metal sheet uses mechanical interlocking to achieve 360° interlocking edge locking with an interlocking depth ≥20mm. Step 4: Detailed structural treatment and acceptance.

8. The construction method of the anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 7, characterized in that: In step three, when installing the top corrugated metal sheet, the top corrugated metal sheet extends into the gutter by 70-120mm, and the eaves are covered with L-shaped edge-sealed color steel sheet, which is fixed by alternating self-tapping screws and rivets.

9. The construction method for the anti-seepage and anti-condensation composite color steel roof of a large factory building according to claim 7, characterized in that, Step four includes: Immediately after the roof panels are installed, the edges and corners should be finished, with the folded edges facing the direction of water flow. Strengthen the eaves, skylights, and gable flashing joints, with an additional layer overlap width ≥ 500mm; Perform reliability checks on connector fasteners, quality checks on interlocking seams, and sealing checks. Conduct wind pressure resistance test and water spray test, with the water spray test lasting no less than 2 hours.

10. The construction method of the anti-seepage and anti-condensation composite color steel roof for large factory buildings according to claim 7, characterized in that, The top-layer profiled metal sheet is installed using a profiled metal sheet installation device. The profiled metal sheet installation device includes a support frame, a ramp plate, and a bracket. The support frame is a rectangular frame formed by splicing multiple metal rods. The ramp plate is located on the upper part of the support frame. The surface of the ramp plate is provided with strip-shaped groove structures corresponding to the protrusions on the top-layer profiled metal sheet. The ramp plate can rotate relative to the support frame to change the tilt angle. The bracket is fixed to the bottom of the support frame.

Images