Construction technology of metal roof for platform canopy construction

Abstract

The invention provides a construction technology of a metal roof for platform canopy construction, and relates to the technical field of platform canopy metal roof construction. The construction technology of the metal roof for platform canopy construction comprises the steps that installation errors of the previous procedure are rechecked; installing a plate arrangement drawing according to plates; elevation and axis datum point connection and recording of previous and later procedures are completed properly; reasonably measuring, setting and encrypting benchmarks on the ground, and adjusting the closing error; various control lines are encrypted and closed according to requirements, the accuracy and stability of the whole metal roof structure are ensured in the installation error rechecking link of the previous procedure, and structural deviation and functional defects caused by accumulative errors are avoided; the gutter system ensures that the gutter structure is firm and has no leakage hidden danger, and the waterproof service life of the metal roof is greatly prolonged; the stable bearing capacity of the purline system is guaranteed through purline installation; the metal roof system and the whole roof structure form an organic whole, various external forces can be effectively resisted, and the structural safety of the platform canopy in a complex environment is improved.

Description

Technical Field

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

[0002] The construction of metal roofs for platform canopies faces many challenges, such as high installation accuracy requirements for each layer of the structure, difficulty in waterproofing, and complex construction procedures.

[0003] Traditional technology has shortcomings in construction efficiency, quality control, etc., and it is difficult to meet the needs of modern platform canopy construction. Summary of the invention

[0004] 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 metal roofs used in platform canopy construction, including the installation error review of the previous process: using high-precision leveling instruments, total stations and other measuring instruments to accurately re-measure the top surface elevation and axis position of the steel structure roof, and control the error within the specified range; according to the plate installation layout diagram, use steel tape measures and ink lines to accurately measure the roof purlins, bottom plates, panel fixing seats and related control lines; properly complete the handover and record of the elevations and axis reference points of the previous and next processes; reasonably measure and encrypt the leveling points on the ground and adjust the closure difference; encrypt and close various control lines as required to ensure accurate measurement.

[0005] In addition, the construction process of a metal roof for platform canopy construction according to an embodiment of the present application also has the following additional technical features:

[0006] Preferably, the purlin installation comprises the following steps:

[0007] Install in the order of purlin support, main purlin, secondary purlin and roof system; purlin support is welded to the upper chord ball of the grid with high-quality welding rod and anti-corrosion is applied; ensure the angle and position accuracy between purlin support and grid steel pipe wing plate; fix the purlins with full welding with stiffening plates to ensure welding quality.

[0008] Preferably, the gutter system installation comprises the following steps:

[0009] Measure and lay out, after checking the purlin system with measuring instruments, place the gutter and keel positions according to the site and drawings, and make timely adjustments if there are any deviations; install the gutter keel, accurately weld the keel to the primary and secondary purlins, first spot weld and then full weld, ensure the keel is horizontal, straight, spaced and has a drainage slope, and polish the welds; install the gutter, customize the stainless steel gutter, overlap and weld according to the process, and can be hoisted after welding on site or on the ground to ensure that the gutter does not deform; water-tightening test, carefully check the appearance of the weld and the water seepage on rainy days, properly deal with the problem and trim and clean, do water-tightening or water storage test according to the conditions to ensure normal drainage of the gutter.

[0010] Preferably, the installation of the metal roofing system includes the following steps:

[0011] Installation of the roof bottom plate, dust-proof layer, sound-absorbing layer, and air barrier layer: The bottom plate is buckled on the secondary purlins along the water flow direction to ensure lap joint and installation quality. The dust-proof layer, sound-absorbing layer, and air barrier layer are pasted as required and the lap width of each layer is ensured; Installation of the channel-shaped purlins: The channel-shaped purlins are accurately positioned and firmly fixed on the secondary purlins according to the on-site conditions; Installation of the insulation layer for the isolation layer: After cleaning the bottom plate, the insulation cotton is carefully laid to ensure flatness, tightness, and reliable fixation; Installation of the lining purlins: The lining purlins are arranged perpendicular to the channel-shaped purlins and fixed regularly; Installation of the waterproof layer: The waterproofing membrane is laid, fixed, and welded according to the process, the process parameters are strictly controlled, and the joint treatment is done well; Installation of the connection brackets for the roof panels: The brackets are accurately installed at intervals to ensure the standard installation of the self-tapping screws; Installation of the insulation layer: Operate in the same way as the isolation layer; Installation of the roof panels: After debugging the equipment, the whole panels are installed. Special personnel are responsible for taking out the panels, handling, and installation, and the panels are timely snapped together to ensure the installation quality of the panels; Seaming and detail treatment: Use special equipment for seaming to ensure the seaming quality, and properly handle the end of the panel extending into the gutter.

[0012] Preferably, the measurement error of the steel structure conforms to the requirements for the installation accuracy of the steel structure in relevant building standards.

[0013] Preferably, the welded seam of the gutter keel is full and flat, without defects affecting the structural strength and waterproof performance.

[0014] Preferably, the welding process parameters of the TPO waterproofing membrane are accurate. After welding, the waterproof layer can effectively prevent water leakage for a long time and the strength meets the design requirements.

[0015] Preferably, after the roof panels are installed, the whole is flat, the height difference between adjacent panels is within the allowable range, and the fixation is firm and stable.

[0016] Preferably, after seaming by the seaming machine, the lap joint of the roof panels is tightly combined and there is no loosening or deformation under the action of the designed wind force.

[0017] Preferably, the flashing is well fixed and sealed with the roof panels and the bottom plate, the sealant has strong weather resistance, and can effectively prevent rainwater leakage.

[0018] For the construction technology of the metal roofing for the platform canopy according to the embodiment of the present application, the beneficial effects are as follows:

[0019] 1. In the link of rechecking the installation error of the previous process, through instruments such as high-precision total stations and level gauges, the top elevation and axis position of the steel structure roof cover are accurately measured, and strictly controlled within a very small error range. This provides a solid foundation for the accurate installation of subsequent components, ensures the accuracy and stability of the entire metal roofing structure, and avoids structural deviation and functional defects caused by cumulative errors;

[0020] 2. During the installation of the gutter system, from surveying and layout to keel installation, gutter welding, and water tightness test, each step is strictly controlled. The precise welding of the gutter steel keel and the grinding treatment of the weld seams, combined with the reasonable lap welding of the customized stainless-steel gutters, ensure the firmness of the gutter structure and no potential leakage problems. During the installation of the waterproof layer, the strict laying and welding process of the TPO waterproofing membrane, as well as the proper treatment of the end parts, effectively prevent rainwater penetration, greatly extend the waterproof life of the metal roof, and reduce the later maintenance cost;

[0021] 3. During the installation of purlins, the firm welding of purlin brackets to the grid, the precise control of the angles and positions of purlin brackets, and the full-weld connection of stiffening plates between purlins ensure the stable load-bearing capacity of the purlin system. In the metal roof system, the reasonable installation and connection of various components such as roof bottom plates, U-shaped purlins, and secondary purlins make the entire roof structure form an organic whole, which can effectively resist various external forces, such as wind force and self-weight, and improve the structural safety of the platform awning in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is the overall construction flow chart of the metal roof according to the embodiment of the present application;

[0024] Figure 2 is the process flow chart of the construction of the metal roof system according to the embodiment of the present application;

[0025] Figure 3 is the process flow chart of the construction of the gutter system according to the embodiment of the present application;

[0026] Figure 4 is the flow chart of the installation of purlins according to the embodiment of the present application;

[0027] Figure 5 is the schematic diagram of the waterproofing membrane arranged on the insulation layer according to the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] 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.

[0029] The invention discloses a construction process of a metal roof for platform canopy construction, comprising installation of primary and secondary roof purlins, measurement and layout, roof base plate installation, dustproof layer installation, sound-absorbing layer installation, air-insulating layer installation, I-shaped purlin installation, waterproof layer installation, lining purlin installation, panel connection bracket installation, isolation layer installation, roof panel installation, edge locking and detail processing, a fall prevention system and an inspection horseway installation.

[0030] The following is a detailed description through specific implementation methods:

[0031] 1. Review of installation errors in the previous process

[0032] Organize a professional surveying team, equipped with high-precision levels (such as Tianbao DI N I03 level, the mean error of the round-trip height measurement per kilometer is ≤0.3mm) and total stations (such as Leica TS16 total station, angle measurement accuracy ≤1″, distance measurement accuracy ≤1mm+1ppm).

[0033] In some specific embodiments, measurement points are set on the top surface of the steel structure roof in a 5m×5m grid, the elevation is re-measured, and the measured value is compared with the designed elevation, and the error is controlled within ±5mm. For the axis position, the coordinates of the intersection of each axis are accurately measured according to the general building plan and the steel structure construction drawing, and compared with the designed coordinates, the deviation does not exceed 10mm.

[0034] According to the panel installation layout, use a steel tape measure and ink line with an accuracy of 1mm to pop up the installation control lines of the roof purlin, roof bottom plate, and roof panel fixing seat on the steel structure, with an error of no more than 3mm. When measuring the control lines such as the gutter elevation and center position line, use a level and theodolite to control the gutter elevation error within ±3mm, and the center position line deviation within 5mm.

[0035] When handing over at the benchmark point, both parties will carefully check and sign for confirmation on site to form a detailed handover record.

[0036] When surveying and setting benchmark leveling points on the ground, choose a stable area with good visibility. The distance between leveling points should not exceed 20m. Use closed leveling method for encryption and closure error adjustment to ensure that the elevation error of each leveling point is within ±1mm.

[0037] When encrypting various control lines, add control points at key positions such as corners and grade changes according to actual needs, accurately connect each point with a steel tape measure and a string line, and close the loop to ensure that the accuracy of the control line reaches the millimeter level.

[0038] 2. Purlin Installation

[0039] Follow the overall installation sequence. Taking the principle of creating a working surface for the installation of roof panels as early as possible, the installation sequence is first to create conditions for the installation of the gutter.

[0040] First, install the purlin brackets. Let experienced and certified welders weld the purlin brackets to the upper chord welding balls of the steel structure grid. Before welding, clean the oil stains, rust and other impurities at the welding parts. Control the welding current within the safe range, and keep the welding speed moderate to ensure that the welds are uniform and full, without defects such as pores and slag inclusions. After welding, immediately carry out anti-corrosion treatment.

[0041] During the installation of the purlin brackets, use an angle gauge with an accuracy of ±0.1° to measure the angle between it and the web plane of the grid steel pipe, ensure that it is within the range of 90°±1°, and use a steel ruler to measure the position deviation, controlling it within 5mm.

[0042] Weld the stiffening plates between the main purlins and the purlin brackets, and between the secondary purlins and the main purlins. The thickness of the stiffening plate is selected according to the design requirements (such as a 6mm thick steel plate). The welding adopts the full-weld process, and the weld height is not less than 6mm. Pay attention to controlling the welding sequence during welding, and use methods such as segmental back welding or skip welding to prevent deformation.

[0043] Specifically, during the installation of the purlins, some details are also involved, including: first, accept the steel structure. After passing the acceptance, install the purlins, check the span of the purlins, then measure the position and place the purlin brackets, and use spot welding to pre-fix the purlin brackets. After fixing, carry out specific welding. During the welding process, pay attention to deformation correction. After welding is completed, carry out anti-corrosion treatment on the welds, then hoist the purlins, install the fastening bolts, and finally check the purlin stagger and the straightness of the purlins.

[0044] 3. Gutter System Installation

[0045] Measurement and layout: Use a level and a theodolite to re-measure the purlin system. For example, measure a point every 3m on the purlins, check that the flatness error does not exceed 5mm, and the radian and slope meet the design requirements.

[0046] According to the actual on-site dimensions and construction drawings, use a string line and a steel tape measure to mark the installation positions of the gutter and its keels on the purlins, with clear and accurate markings, and the error does not exceed the allowable value. For parts that exceed the standard allowable error, such as excessive flatness deviation of the purlins, a jack or a crowbar can be used for adjustment to ensure compliance with the installation requirements.

[0047] Installation of gutter keel: Weld the gutter steel keel to the main and secondary purlins using welding rods. First, position and spot-weld the vertical steel keels on both sides of the gutter and the horizontal through-length steel keels on both sides of the upper opening. After spot-welding, use a level to check whether the horizontal through-length steel keels on both sides of the upper opening are horizontal, with the error not exceeding the allowable value. Use a steel ruler to check whether the spacing meets the gutter width dimension, with the error controlled within the allowable range, and at the same time ensure that the drainage elevation is correct. After confirmation, perform full welding for fixation.

[0048] When installing the lower steel keel of the gutter, slope it at 1% according to the position of the siphonic rainwater bucket. First, fix it by spot-welding. After using a level to detect that the elevation is correct and the steel keel is straight, perform full welding. The height of the full-weld seam is not less than 6 mm. After welding is completed, use a angle grinder to polish the weld at the joint position of the steel keel to make the height of the weld bead not more than 1 mm and keep the surface smooth and flat.

[0049] Before installing the gutter, perform anti-corrosion treatment on the steel keel weld with zinc-rich primer. The primer should be evenly applied to ensure no missed brushing.

[0050] Gutter installation: The gutter is custom-made from 316 stainless steel with a thickness of 3 mm in the factory. After being transported to the site, each one is placed into the keel with an overlap of not less than 10 mm. Before butt joint, use a grinding wheel cutting machine to polish the cut surface until it shows metallic luster, and then spot-weld at intervals of every 10 cm. After confirming that the welding requirements are met, perform full welding. Argon arc welding is used for welding, and the welding consumables are determined according to the mother plate to ensure that the gutter does not deform after welding and avoid the phenomenon of water accumulation due to reverse slope of the gutter. During on-site welding, lay wet towels on both sides of the weld to prevent fire. If the site permits, perform welding and assembly in the ground backstage processing area, and use special lifting tools to hoist the assembled gutter as a whole to the working surface. The hoisting process should be stable to prevent collision and deformation.

[0051] Water tightness test: After each gutter is installed, first, a professional quality inspector checks the appearance of the weld. The weld surface should be smooth, without defects such as pores, cracks, and slag inclusions. On rainy days, arrange special personnel to check whether there are pores that cannot be detected by the naked eye in the weld. If pores and water seepage are found, use a angle grinder to polish the area, remove the oxide scale and impurities, and re-weld with the same welding parameters as the original ones. After all welding is completed, use a file to clean the burrs and unevenness at the shearing edge to make it smooth and flat. Conduct a comprehensive cleaning of the gutter, remove the waste during roof construction, especially at the rainwater outlet position, and use a high-pressure water gun to wash it to ensure no silt accumulation. When there is no construction water connection on the roof and a water spraying test cannot be performed, an artificial rainwater storage test is adopted. Before it rains, use an airbag to block the siphonic drainage outlet. After being rained on for more than 2 hours, carefully observe from the lower floor of the roof. There should be no leakage marks, and the gutter drainage should be unobstructed, and the water flow rate should meet the design requirements.

[0052] 4. Installation of metal roof system

[0053] Installation of Roof Bottom Plate and Vapor Barrier: When installing the roof bottom plate, the construction workers press the bottom plate onto the secondary purlins sequentially from one side to the other side. The overlapping method is from top to bottom along the water flow direction, and the overlapping length of adjacent bottom plates is not less than 200 mm. Use ST4.8*16 mm self-tapping screws for fixation, and the spacing of self-tapping screws is not greater than 300 mm. When installing, gently tap the bottom plate with a rubber hammer to make the bottom plate fit tightly with the purlins. Pay attention to the overlapping of the ribs of the bottom plate and align them with each other to ensure the interconnection between the trapezoidal profiled sheet grooves. After installation, use a 2m straightedge to check the flatness of the roof bottom plate, with the error not exceeding 5 mm, the joints are tight, the joints are straight, the anchorage is reliable, the vertical and horizontal overlapping joints are straight lines, and the plate surface is flat and clean. When laying the vapor barrier, use a 0.3 mm polypropylene plastic veneer vapor barrier and stick it to the bottom plate with self-adhesive strips. The self-adhesive strips are firmly adhered, and the overlapping between the breathable layers is not less than 80 mm to prevent voids.

[0054] Installation of Z-shaped Purlins: According to the actual position of the secondary purlins on site and combined with the layout spacing of the roof panels, mark the positions of the Z-shaped purlins on each secondary purlin at an interval of 900 mm, use a string line to pop out the control line, with the error not exceeding 5 mm. At the same time, it is necessary to ensure that the Z-shaped purlins are at the wave crest position of the bottom plate, with the deviation not exceeding 10 mm. Then use ST4.8*25 mm self-tapping screws to penetrate the bottom plate and fix the Z-shaped purlins to the secondary purlins. The tightening torque of the self-tapping screws is controlled at 1.5 - 2.0 N·m to ensure firm connection, and at the same time, fix the bottom plate and the secondary purlins tightly.

[0055] Installation of Insulation Layer: Before filling and laying the insulation cotton of the isolation layer in the bottom plate, use a broom to clean the debris on the roof bottom plate twice to ensure that there is no dust and debris residue. Press the 50 mm thick ultra-fine glass fiber cotton (bulk density 24 kg / m 3 ) tightly against the roof bottom plate. The joints between adjacent rock wool are tight, and staggered laying is adopted, with the staggered width not less than 100 mm. The overall paving is flat. Use a 5m long aluminum alloy straightedge to check the flatness, with the error not exceeding 10 mm. Use insulation nails for fixation, and the spacing of insulation nails is not greater than 500 mm. The insulation nails penetrate the insulation cotton and the bottom plate to ensure firm fixation, and the surface of the insulation cotton is pollution-free.

[0056] Installation of Lining Purlins: Set lining purlins in the direction perpendicular to the Z-shaped purlins and arrange them longitudinally. The lining purlins are made of C-shaped steel, and the specifications are selected according to the design requirements. They are fixedly connected to the Z-shaped purlins through ST4.8*25 mm self-tapping screws. The spacing of self-tapping screws is not greater than 300 mm. When installing, ensure that the lining purlins are perpendicular to the Z-shaped purlins and the connection is firm.

[0057] Installation of Waterproof Layer

[0058] Laying insulation board: Select a suitable insulation board (such as extruded polystyrene foam board with a thermal conductivity ≤ 0.03 W / (m·K)), lay it on the roof base layer according to the design requirements. The insulation boards should be spliced tightly with gaps not exceeding 2 mm, and use special glue for pasting and fixing to ensure the insulation effect.

[0059] Pre-laying TPO waterproofing membrane (as Figure 5 shown): Arrange the 1.8 mm thick polyester fiber-reinforced high-performance TPO waterproofing membrane on the insulation layer according to the position controlled by the snap line. The laying direction of the membrane is perpendicular to the corrugation direction of the profiled steel sheet. Lay the naturally loose membrane on the insulation layer according to the contour, use a rubber squeegee to scrape the membrane flat, remove air, and make the membrane fit tightly with the insulation layer. The membrane should be kept flat and straight without twisting. The lap width is 120 mm, and appropriate cutting should be carried out.

[0060] Fastening TPO waterproofing membrane with fasteners: Fasteners and gaskets are used to fix the membrane 30 mm away from the edge of the membrane along the marked line, and an electric screwdriver is used for fixing. Ensure that the fasteners are perpendicular to the surface of the membrane during fixing.

[0061] Hot air welding TPO waterproofing membrane: Use a welding machine to weld each lap joint. The welding temperature is controlled at 400 - 450 °C, and the welding speed is 3 - 5 cm / s. One membrane laps over another, covering the fasteners and gaskets under the waterproof layer. If double-weld seams are used, air inflation detection is required. The inflation pressure is 0.15 - 0.2 MPa, and the holding time is not less than 5 min. Check whether there is air leakage in the weld seams to ensure the welding quality. The end part is fixed with a 30*3 mm aluminum alloy pressure bar and sealed with neutral silicone sealant. The thickness of the sealant is not less than 3 mm, and the sealing is tight to prevent rainwater leakage. For single-seam welding, the lap width is 60 mm, and the effective weld width is not less than 25 mm; for double-seam welding, the lap width is 80 mm, and the effective weld width is 10 mm * 2 + cavity width (the cavity width is controlled at 8 - 12 mm).

[0062] Installation of roof panel connection brackets: Install connection brackets on each purlin at a spacing of 300 mm for the roof panel wave crests. The connection brackets are made of aluminum alloy (such as 6061-T6 aluminum alloy with a tensile strength ≥ 290 MPa), having sufficient strength and corrosion resistance. There are 4 self-tapping screws on each support, which are vertically driven into the purlin. When using an electric drill screw gun to drive the self-tapping screws, the screws should be tightened moderately without skewing. When the screws are skewed or stripped, a new screw must be driven or reinforced. Use a wrench to check the tightening degree of the screws to ensure firm connection, accurate installation position of the brackets, and an error not exceeding 5 mm.

[0063] Installation of insulation layer: The same method as the installation of the insulation layer for the isolation layer. Set the insulation layer in the direction perpendicular to the purlin. The insulation layer uses 50 mm + 50 mm thick hydrophobic insulation rock wool (bulk density 180 kg / m3 ) It is laid with staggered joints, and the width of the staggered joints is not less than 100 mm, and it is fixed with thermal insulation nails.

[0064] Roof panel installation: After debugging the pressing machine, trial production is carried out to ensure that the profile of the roof panel pressed meets the design requirements. During the hoisting process of the roof panel, special lifting tools (such as soft slings) are used to avoid deformation of the roof panel. During installation, one person is arranged every 6 m. The small corrugated edge of the vertical wall faces the installation direction side and is arranged in sequence. It is installed on the bracket. The large and small corrugated edges are buckled together. Special personnel are arranged to observe the situation of buckling on the bracket to ensure the accurate setting and firm fixation of the fixing points. During the installation process, the flatness of the roof panel should be checked at any time. After the roof panel is laid, the special seaming machine should be used as soon as possible to bite the panels together and make the panel joints tightly bitten. The two ends of the roof panel should extend into the gutter not less than 50 mm after trimming with a wire and the projection length slightly protrudes from the roof bottom plate.

[0065] Seaming and detail treatment: Use a special electric seaming machine for seaming. The rollers of the seaming machine should be regularly inspected and replaced to ensure the seaming quality. During seaming, the walking speed of the seaming machine should be controlled, generally 1 - 1.5 m / min. The overlapping edge of the roof panel should be firmly clamped within 1 m in front of the seaming machine to make the overlapping edge tightly joined and prevent loosening during the seaming process. After seaming, the seaming quality should be inspected. The inspection contents include seaming depth, seaming continuity and flatness, etc. The seaming depth should meet the design requirements. The seaming should be continuous and flat, without phenomena such as fracture and wrinkling. The roof panels installed on the same day must be seamed to prevent the roof panels from being blown or blown away by strong winds. At the same time, a wind resistance performance test should be carried out.

[0066] After the trimming of the roof panel extending into the gutter is completed, first add foam plugs to the end section of the roof bottom plate and the panel, and then fix the drip plate with rivets from the lower opening of the roof panel to completely seal the gap between the panel and the bottom plate. The overlapping part of the drip plate is fixed with rivets and sealed with silicone sealant.

[0067] In this way, the construction process of a metal roof for platform canopy construction proposed in this application, in the previous installation error review process, uses high-precision total stations, levels and other instruments to accurately measure the elevation of the steel structure roof top surface and the axis position, and strictly control them within an extremely small error range. This provides a solid foundation for the precise installation of subsequent components, ensures the accuracy and stability of the entire metal roof structure, and avoids structural deviations and functional defects caused by cumulative errors; in the installation of the gutter system, from measurement and layout to keel installation, gutter welding and water-tightness test, each step is strictly controlled, the precise welding of the gutter steel keel and the weld grinding treatment, plus the reasonable overlap welding of the customized stainless steel gutter, ensure the gutter structure It is firm and has no leakage risks. When the waterproof layer is installed, the strict laying and welding process of the TPO waterproof membrane and the proper treatment of the end parts can effectively prevent rainwater penetration, greatly extend the waterproof life of the metal roof, and reduce the subsequent maintenance costs. During the purlin installation process, the firm welding of the purlin support and the grid, the precise control of the purlin support angle and position, and the full welding connection of the stiffening plates between the purlins ensure the stable bearing capacity of the purlin system. In the metal roof system, the reasonable installation and connection of various components such as the roof base plate, I-shaped purlins, and lining purlins make the entire roof structure form an organic whole, which can effectively resist various external forces, such as wind force, self-weight, etc., and improve the structural safety of the platform canopy in complex environments.

[0068] 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 metal roof for a platform canopy, characterized in that: The following steps are involved: Error review of installation in the previous process: Use high-precision level, total station and other measuring instruments to accurately re-measure the top elevation and axis position of the steel structure roof, and control the error within the specified range; According to the panel installation layout, use a steel tape measure and ink line to accurately measure the roof purlins, bottom plate, panel fixing seat and related control lines; Properly complete and record the handover of the previous and next process elevations and axis reference points; Reasonably survey and set level points on the ground, increase the density of level points and adjust the closure error; Encrypt and close various control lines as required to ensure accurate measurements.

2. The construction process of a metal roof for platform canopy construction as claimed in claim 1, characterized in that: Purlin installation includes the following steps: Install in the order of purlin support, main purlin, secondary purlin and roof system; The purlin support is welded to the upper ball of the grid with high-quality welding rods and anti-corrosion treatment; Ensure the angle and position accuracy between the purlin support and the steel tube wing plate of the grid; The purlins are fully welded and fixed with stiffening plates to ensure welding quality.

3. The construction process of a metal roof for platform canopy construction as claimed in claim 1, characterized in that: Gutter system installation includes the following steps: Measure and lay out, use measuring instruments to check the purlin system, and then place the gutter and keel positions according to the site and drawings, and make timely adjustments if there is any deviation; Install the gutter keel, accurately weld the keel to the main and secondary purlins, first spot weld and then full weld, ensure the keel is level, straight, spacing and drainage slope, and grind the weld; Gutter installation, customized stainless steel gutters, overlap welding according to the process, can be hoisted on site or on the ground after welding to ensure that the gutter does not deform; Carry out water-tightness test, carefully check the appearance of the weld and water seepage during rainy days, properly deal with the problem and then trim and clean, perform water-tightness or water storage test according to the conditions to ensure normal drainage of the gutter.

4. The construction process of a metal roof for platform canopy construction as claimed in claim 1, characterized in that: Metal roof system installation includes the following steps: The roof bottom plate, dustproof layer, sound-absorbing layer and air-insulating layer are installed. The bottom plate is buckled on the secondary purlin along the water flow to ensure the overlap and installation quality. The dustproof layer, sound-absorbing layer and air-insulating layer are pasted as required and the overlap width of each layer is guaranteed; Installation of the "J"-shaped purlin: accurately locate and firmly fix the "J"-shaped purlin on the secondary purlin according to the site conditions; Install the insulation layer, clean the bottom plate and carefully lay the insulation cotton to ensure it is flat, tight and securely fixed; Installation of lining purlins, setting of vertical purlins and standardization of fixing of lining purlins; Installation of waterproof layer, laying, fixing and welding coiled materials according to the process, strictly controlling process parameters and doing a good job of node processing; The roof panel connection bracket is installed, and the bracket is accurately installed according to the spacing to ensure that the self-tapping screws are installed in accordance with the specifications; The thermal insulation layer is installed in the same way as the isolation layer; Installation of roof panels, installation of the whole panel after debugging the equipment, dedicated personnel responsible for panel delivery, transportation and installation, timely interlocking of panels to ensure panel installation quality; Lock the edges and do detailed processing, use special equipment to bite the edges, ensure the quality of the edges, and properly handle the ends of the panels extending into the gutter.

5. The construction process of a metal roof for platform canopy construction as claimed in claim 1, characterized in that: The steel structure measurement error meets the requirements of relevant building standards for steel structure installation accuracy.

6. The construction process of a metal roof for platform canopy construction as claimed in claim 3, characterized in that: The welding seams of the gutter keels are full and smooth, without any defects that affect the structural strength and waterproof performance.

7. The construction process of a metal roof for platform canopy construction as claimed in claim 4, characterized in that: The welding process parameters of the TPO waterproof coil are precise, and the waterproof layer after welding can effectively provide long-term waterproofing and the strength meets the design requirements.

8. The construction process of a metal roof for platform canopy construction as claimed in claim 4, characterized in that: After the roof panel is installed, it is flat as a whole, the height difference between adjacent panels is within the allowable range, and it is firmly and stably fixed.

9. The construction process of a metal roof for platform canopy construction as claimed in claim 4, characterized in that: After the edge biting machine bites the edge, the overlapping edges of the roof panels are tightly combined and there is no looseness or deformation under the action of the designed wind force.

10. The construction process of a metal roof for platform canopy construction as claimed in claim 4, characterized in that: The shedding board is well fixed and sealed with the roof board and the bottom board, and the sealant has strong weather resistance and can effectively prevent rainwater leakage.

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