A construction method of a waterproofing membrane for a steel structure roof

Abstract

The present application relates to the technical field of building roof waterproof construction, and particularly relates to a steel structure roof waterproof coiled material construction method, comprising the following steps: laying and welding waterproof coiled material: positioning by a line on the thermal insulation layer, laying the waterproof coiled material on the thermal insulation layer by a line, and absorbing and fixing the top of the fixing part by a magnetic induction welding machine with a self-seeking function and heating the hot melting layer, so that the top of the fixing part and the back of the coiled material are fused and welded.

Description

Technical Field

[0001] This invention relates to the field of building roof waterproofing construction technology, and in particular to a method for constructing waterproof membrane for steel structure roofs. Background Technology

[0002] Steel structure roofs are widely used in industrial plants, industrial parks, and large warehouse buildings due to their lightweight, high construction efficiency, and excellent space utilization. As a core component of steel structure roofs, the construction quality of the roof waterproofing system directly determines the roof's durability, wind resistance, and energy efficiency, making it a crucial construction step in steel structure roofing projects.

[0003] Currently, in the construction of waterproofing membranes for steel structure roofs, traditional methods often use perforated mechanical fixing. This method creates holes in the membrane, which can easily become potential sources of water seepage. Furthermore, the perforated areas are prone to stress concentration under the long-term effects of temperature stress, wind loads, and roof vibrations, leading to membrane cracking, seal failure, and ultimately, roof leaks. Therefore, there is an urgent need to develop a non-perforated construction method for waterproofing membranes on steel structure roofs to avoid the leakage risks associated with perforations. Summary of the Invention

[0004] Therefore, to address the above-mentioned problems, this invention proposes a method for constructing waterproof membrane for steel structure roofs without the need for perforation.

[0005] This invention is achieved through the following technical solution:

[0006] A method for constructing a waterproof membrane for a steel structure roof, wherein the roof structure comprises, from bottom to top, a profiled steel sheet base layer, an air barrier layer, an insulation layer, and a waterproof membrane layer, comprising the following steps:

[0007] 1) Base treatment: The profiled steel sheet base is leveled and cleaned to remove protrusions, depressions, water accumulation and sharp foreign objects;

[0008] 2) Laying the vapor barrier layer: Lay the vapor barrier layer on the surface of the profiled steel sheet base layer, using a water-flow overlapping method, and bond and seal the overlapping and closing parts and compact them;

[0009] 3) Install the insulation layer and fasteners: The fasteners are iron disc nails. The insulation layer is laid on top of the air barrier layer and fixed to the profiled steel sheet base layer by at least one fastener with a hot-melt layer on the top.

[0010] 4) Determine the welding temperature: Lay a portion of the waterproof membrane, set at least one temperature level according to the ambient temperature, and conduct a test weld. Perform a peel test on the waterproof membrane after the test weld to determine the welding temperature level that meets the qualification standard.

[0011] 5) Laying and welding waterproof coiled material: Mark the position on the insulation layer, then lay the waterproof coiled material on the insulation layer according to the marked line. Use a magnetic induction welding machine with a self-searching function to adsorb the top of the fixing piece and heat its hot-melt layer, so that the top of the fixing piece and the back of the coiled material are melted and welded.

[0012] 6) Cooling and strengthening: Use an aluminum porous radiator with a magnetic adsorption self-searching function to press and cool the welding part to strengthen the connection strength, and perform the welding and cooling alternately in a cycle.

[0013] 7) Treatment of coiled material lapping: Weld the lapping edge of the waterproof coiled material and press in the weather-resistant adhesive strip.

[0014] 8) Treatment of detail nodes: Seal, fix and weld the T-joints, the perimeter of the roof, the penetrated members, the deformation joints and the ridge parts on the steel structure roof.

[0015] 9) Inspection and acceptance: Conduct quality inspection on the completed waterproof coiled material layer.

[0016] As a further improvement of the present invention, the insulation layer includes two layers of rock wool board insulation layers laid in parallel up and down. Each layer of the insulation layer is composed of several rock wool boards laid with staggered joints, and the rock wool boards between the upper and lower layers of the insulation layer are laid with staggered joints.

[0017] As a further improvement of the present invention, in step 4), the specific steps for determining the welding temperature are as follows: Before construction, lay a part of the waterproof coiled material, and set three different temperature ranges in sequence from low to high according to the ambient temperature for trial welding. After each trial welding, conduct a peel test on the test weldment. Take the temperature range that first meets the qualified standard that the fixing piece and the coiled material do not peel when the coiled material is damaged as the welding temperature range.

[0018] As a further improvement of the present invention, the arrangement of the fixing pieces is divided into a dense area and a non-dense area. A "mouth" - shaped dense area is formed around the light steel roof, and the middle of the dense area is the non-dense area; the center spacing of the fixing pieces in the dense area is 0.6m × 0.48m, the center spacing of the fixing pieces in the non-dense area is 0.6m × 0.72m, and the number of fixing pieces on each rock wool board is at least two.

[0019] As a further improvement of the present invention, in step 7), the lap joint of adjacent waterproof coiled materials is welded by hot air and the weather-resistant adhesive strip is pressed in; a crawling welding machine and a hand-held welding machine are used for welding. The welding speed of the crawling welding machine is 2.5 - 3m / min, the lap width is 75 - 100mm, and the effective welding width is greater than 25mm; the temperature of the welding torch of the hand-held welding machine is controlled at 250 - 450 °C, and the welding speed is 0.2 - 0.5m / min; when welding, the welding nozzle forms a 45° angle with the welding direction, and the pressure roller is parallel to the welding nozzle and keeps a distance of 30 - 35mm.

[0020] As a further improvement of the present invention, in step 8), the T-joint is processed as follows: the roll material within a range of at least 10cm in the T-joint area is cut, the front end of the weld is cut into a bevel, and then a circular TPO roll material with a diameter of at least 10cm is cut and welded onto the T-joint. It is first spot welded and then the surrounding area is welded firmly.

[0021] As a further improvement of the present invention, the perimeter of the roof and at least one through-hole component are fixed with pressure strips and the screw spacing is 300mm.

[0022] The large-area roll material at the expansion joint and ridge is installed separately, fixed with pressure strips, and then PE rods are installed. Finally, a roll material covering layer is welded to the roll material on both sides. The width of the roll material covering layer at the expansion joint is 500mm, and the width of the roll material covering layer at the ridge is 650mm.

[0023] As a further improvement of the present invention, the profiled steel sheet has a crest portion and a trough portion, and the fastener is vertically fixed on the crest portion of the profiled steel sheet base layer.

[0024] As a further improvement of the present invention, in step 2), the air barrier layer is a PE film air barrier layer, the overlapping method is a water-flow overlapping treatment, the overlap width is ≥100mm, and the overlapping part is bonded with 10×1mm butyl tape to form a sealed and compacted sealing part.

[0025] As a further improvement of the present invention, in step 2), the air barrier layer at the overlap and closing parts, roof openings and surrounding parts is sealed with waterproof sealing tape with a width of ≥10mm, and compacted with a pressure roller.

[0026] The beneficial effects of this invention are as follows: For the layered structure of steel roofs consisting of a profiled steel sheet base layer, vapor barrier layer, insulation layer, and waterproof membrane layer, this invention abandons the traditional perforation fixing method. It first completes the construction and installation of the fixing components layer by layer, including the base layer, vapor barrier layer, and insulation layer. The optimal welding temperature is determined through environmental temperature adaptability test welding. Then, a magnetic induction welding machine with self-tracking function is used to fuse the waterproof membrane to the top hot-melt layer of the fixing component. A porous aluminum radiator is used to press and cool the welded area to strengthen the connection. Subsequently, membrane overlap, detailed node treatment, and quality inspection are completed sequentially, forming a perforation-free, welded waterproof construction system. This fundamentally avoids the problem of holes formed by traditional perforation fixing on the waterproof membrane, eliminating the risk of water seepage. Stress concentration at non-perforated areas can lead to membrane cracking and sealing failure. Meanwhile, magnetic induction welding machines, an existing technology, offer precise welding with their self-tracking function, eliminating missed welds and re-welding. Aluminum porous radiators, also an existing technology, enhance weld strength through cooling, ensuring stable connections between the waterproof membrane and fasteners. Furthermore, welding temperatures are dynamically determined based on ambient temperature, adapting to different construction environments and preventing weak welds or membrane melting due to improper temperature, thus improving the consistency of weld quality. Finally, standardized layer-by-layer construction and specialized overlap / joint treatments create a complete waterproofing system, improving the overall construction quality of the steel structure roof waterproofing system and enhancing its durability and wind resistance. Attached Figure Description

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0028] Figure 1 This is a schematic diagram of the steel roof structure in this invention;

[0029] Figure 2 This is a flowchart of the steps of the present invention;

[0030] Figure 3 This is a schematic diagram of the insulation layer structure in this invention;

[0031] Figure 4 This is a schematic diagram of the structure when the material is laid to the edge of the parapet wall in this invention;

[0032] Figure 5 This is a structural diagram of the process of laying the material up to the protruding component in this invention;

[0033] Figure 6 This is a structural diagram of the process when the material is laid to the expansion joint and ridge area in this invention.

[0034] The numbers in the diagram are: 1. Corrugated steel sheet base layer; 2. Air barrier layer; 3. Insulation layer; 4. Waterproof membrane layer; 5. Fastener; 6. Pressure strip; 7. Eaves aluminum plate; 8. Through-hole component; 9. Waterproof membrane covering layer; 10. PE rod; 11. Weather-resistant adhesive strip. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0036] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0037] refer to Figures 1 to 6 The embodiments of the present invention disclose:

[0038] A method for constructing waterproof membrane for steel structure roofs, referenced Figure 1 The roof structure, from bottom to top, comprises a profiled steel sheet base layer 1, an air barrier layer 2, a thermal insulation layer 3, and a waterproof membrane layer 4, and includes the following steps:

[0039] 1) Base treatment: The profiled steel sheet base 1 is leveled and cleaned to remove protrusions, depressions, water accumulation and sharp foreign objects;

[0040] 2) Laying the vapor barrier layer 2: Laying the vapor barrier layer 2 on the surface of the profiled steel sheet base layer 1, using a water-flow overlapping method, and bonding and sealing the overlapping and closing parts and compacting them;

[0041] 3) Install the insulation layer 3 and fasteners 5: The fasteners 5 are iron disc nails. The insulation layer 3 is laid on top of the air barrier layer 2 and the insulation layer 3 is fixed to the profiled steel sheet base layer 1 by at least one fastener 5 with a hot melt layer on the top.

[0042] 4) Determine the welding temperature: Lay a portion of the waterproof membrane, set at least one temperature level according to the ambient temperature, and conduct a test weld. Perform a peel test on the waterproof membrane after the test weld to determine the welding temperature level that meets the qualification standard.

[0043] 5) Laying and welding waterproof membrane: Mark the positioning lines on the insulation layer 3, then lay the waterproof membrane on the insulation layer 3 according to the marking lines. Use a magnetic induction welding machine with self-finding function to adsorb the top of the fixing part 5 and heat its hot melt layer so that the top of the fixing part 5 is fused and welded to the back of the waterproof membrane.

[0044] 6) Cooling enhancement: The welded parts are cooled by pressing with a porous aluminum heat sink with magnetic self-searching function to enhance the connection strength. Welding and cooling are carried out alternately.

[0045] 7) Overlap treatment of waterproof membrane: Weld the overlap edges of the waterproof membrane and press in weather-resistant adhesive strips;

[0046] 8) Detailed node treatment: T-joints (when three layers of waterproof membrane overlap, T-joints will be generated), roof perimeter (such as parapet walls), through-hole components (such as smoke exhaust ducts), expansion joints and ridge areas on the steel structure roof are sealed, fixed and welded.

[0047] 9) Inspection and acceptance: Conduct quality inspection on the completed waterproof membrane layer 4.

[0048] Through the above setup, for the layered structure of the steel structure roof profiled steel sheet base layer 1-vacuum barrier layer 2-insulation layer 3-waterproof membrane layer 4, the traditional perforation fixing method is abandoned. The construction of the base layer, vapor barrier layer 2, and insulation layer 3 is completed layer by layer, along with the installation of fasteners 5. The optimal welding temperature is determined through environmental temperature adaptability test welding. Then, a magnetic induction welding machine with self-homing function is used to fuse the waterproof membrane to the top hot-melt layer of the fasteners 5. A porous aluminum radiator is used to press and cool the welded area to strengthen the connection. Subsequently, membrane overlap, detailed node treatment, and quality inspection are completed sequentially, forming a perforation-free, welded waterproof construction system. This fundamentally avoids the problem of holes formed by traditional perforation fixing on the waterproof membrane, eliminating the hidden danger of water seepage. To prevent stress concentration at perforated areas, which could lead to membrane cracking and sealing failure, the system employs several techniques. First, a magnetic induction welding machine, a readily available technology, provides precise welding with its self-tracking function, eliminating missed welds and re-welding. Second, an aluminum porous radiator, also a readily available technology, enhances weld strength through its cooling and strengthening effect, ensuring the stability of the connection between the waterproof membrane and fastener 5. Third, the welding temperature is dynamically determined based on ambient temperature to adapt to different construction environments, preventing weak welds or membrane melting due to improper temperature control, thus improving the consistency of weld quality. Finally, standardized layer-by-layer construction and specialized overlap / joint treatments create a complete waterproofing system, improving the overall construction quality of the steel structure roof waterproofing system and enhancing its durability and wind resistance.

[0049] In this invention, the insulation layer 3 comprises two parallel layers of rock wool board insulation layer 3, each layer of which is composed of several rock wool boards laid in a staggered manner, and the rock wool boards between the upper and lower layers of insulation layer 3 are laid in a staggered manner. The staggered laying method can eliminate the thermal bridges in the gaps of the single-layer straight-seam splicing of rock wool boards, thereby reducing heat transfer and improving the overall thermal insulation performance of the roof to meet the building energy conservation requirements. At the same time, the multi-layer staggered structure can also enhance the structural stability of the insulation layer 3, prevent the insulation layer 3 from warping or shifting, and improve the bonding between the insulation layer 3 and the base layer and the roll material layer, reducing the loosening between the roof system layers. Finally, based on the material characteristics of the rock wool board and the multi-layer structure, the fire resistance and extreme temperature resistance of the roof can also be improved, making it suitable for the use needs of industrial plants, industrial parks and other buildings.

[0050] In step 4) of the present invention, the specific steps for determining the welding temperature are as follows: Before daily construction, lay a part of the waterproof coiled material. According to the ambient temperature, set three different temperature ranges for trial welding in ascending order. For example, when the ambient temperature is 1 - 10°C, set three welding temperature ranges, which are 340°C, 360°C, and 380°C respectively; when the ambient temperature is 11 - 20°C, set three welding temperature ranges, which are 360°C, 380°C, and 400°C respectively; when the ambient temperature is 21 - 30°C, set three welding temperature ranges, which are 380°C, 400°C, and 420°C respectively. The trial welding length for each temperature range is not less than 300 mm. After the trial welding is completed, use the manual peeling method to inspect the welding quality: Use a special tool to cut a 50 - mm longitudinal incision along the weld seam, clamp the waterproof coiled material on both sides of the incision with a fixture, and perform 180° peeling at a uniform speed. Observe the state of the peeling surface. Taking that the fastener 5 and the coiled material do not peel off when the waterproof coiled material is damaged as the qualified standard, that is, the peeling surface shows the tearing of the coiled material body rather than the separation of the welding interface, indicating that the welding strength is higher than the strength of the coiled material itself; Determine the welding temperature range for the daily construction as the first temperature range that meets the qualified standard. If all three temperature ranges are unqualified, increase the temperature and retest until a qualified temperature is determined; The trial welding process is simple and efficient, adapts to the ambient temperature changes in different seasons and regions, improves the versatility and adaptability of the construction process, and reduces the rework rate caused by temperature deviation.

[0051] The arrangement of the fastener 5 is divided into a dense area and a non - dense area. A rectangular area around the light - steel roof is the dense area in the shape of a "square", and the non - dense area is in the middle of the dense area; The center - to - center spacing of the fasteners 5 in the dense area is 0.6 m × 0.48 m, and the center - to - center spacing of the fasteners 5 in the non - dense area is 0.6 m × 0.72 m, and the number of fasteners 5 for each rock wool board is at least two; The fasteners 5 are densely arranged around the roof to specifically enhance the wind - load resistance capacity at the roof edge. The non - dense arrangement in the middle reduces the usage of fasteners 5 on the premise of ensuring the fixing strength, realizing an economical design of "strong edge and weak middle"; The standardization of the fastener 5 spacing and at least two fasteners 5 for each rock wool board ensure the fixing stability between the insulation layer 3 and the base layer, preventing the insulation layer 3 from shifting or falling off under the action of wind load and vibration; Moreover, the standardization of the fastener 5 spacing facilitates subsequent welding positioning. The magnetic - induction welding machine can automatically trace the welding according to the position of the fastener 5, improving the construction efficiency and welding accuracy.

[0052] In step 7), the overlap of adjacent waterproof membranes is hot-air welded, and a weather-resistant adhesive strip is pressed in. A crawler welding machine and a handheld welding machine are used for welding. The crawler welding machine has a welding speed of 2.5-3 m / min, an overlap width of 75-100 mm, and an effective weld width greater than 25 mm. The handheld welding machine's welding torch temperature is controlled at 250-450℃, and the welding speed is 0.2-0.5 m / min. During welding, the welding nozzle is at a 45° angle to the welding direction, and the pressure roller is parallel to the welding nozzle and maintains a distance of 30-35 mm. The overlap of the waterproof membranes is hot-air welded and a weather-resistant adhesive strip is pressed in. The combined use of crawling welding machines (for large-area construction) and handheld welding machines (for corners / narrow areas) allows for standardized hot air welding at the joints. The welding speed, overlap width, effective welding width, and welding torch temperature are set for each machine, while the nozzle angle and the distance between the pressure roller and nozzle are standardized. This approach balances efficiency in large-area construction with precision in corner areas, making it suitable for complex steel structure roof surfaces. Standardized operation of the nozzle and pressure roller ensures even molten slurry seepage at the welding edge, preventing missed welds, skipped welds, and scorching. Weather-resistant adhesive strips further enhance the sealing performance of the joints, reducing the risk of weld detachment and leakage.

[0053] The perimeter of steel structure roofs (parapet walls), penetrating components (such as smoke exhaust ducts), expansion joints, and ridge areas are the core weak points in waterproofing construction. These areas are significantly affected by structural deformation, wind load impact, and temperature stress, and are prone to problems such as edge curling of the roof membrane, structural expansion pulling on the membrane, and inadequate sealing at joints. Traditional construction methods, which only use simple membrane bonding or a single fixing method, are prone to membrane detachment, cracking, and leakage. At the perimeter of the roof and penetrating components, the membrane is prone to curling and detachment due to the negative pressure of wind loads. Without dedicated pressure strips for fixing, the connection strength between the membrane and the substrate is insufficient, and gaps are likely to appear after long-term use. Expansion joints and the ridge are extension points of the roof structure. In critical areas of shrinkage deformation, if large areas of the waterproof membrane are laid continuously, the tensile stress generated by the thermal expansion and contraction of the structure will cause the membrane to tear. Without a buffer layer, the deformation stress will act directly on the welded area, which will easily cause the weld to delaminate. Traditional joint treatment lacks standardized covering and sealing processes. Simply overlapping the membrane can easily create gaps between layers, which become channels for water accumulation and seepage. Based on this, in step 8), the treatment method of the T-joint is as follows: the waterproof membrane 4 within at least 10cm of the T-joint area is cut, the front end of the weld is cut into a bevel, and then a circular waterproof membrane 4 (TPO) with a diameter of at least 10cm is cut and welded to the T-joint. It is first spot welded and then the surrounding area is welded firmly.

[0054] The roof perimeter and at least one through-beam are fixed with a pressure strip 6, which is secured by bolts with a screw spacing of 300mm. The pressure strip 6 and the standardized 300mm screw spacing enhance the connection strength between the roof perimeter, through-beams, and the roof membrane, preventing edge curling and detachment of the membrane. Specifically: when the waterproof membrane 4 is laid to the edge of the parapet wall (refer to...). Figure 4 At the intersection of the parapet wall and the roof, the waterproof membrane 4 is turned up at least 250mm from the base of the parapet wall to form a continuous flashing structure. The waterproof membrane 4 at the turned-up edge must be tightly adhered to the parapet wall facade and fully sealed with sealant to eliminate the risk of hollowing. Then, a waterproof membrane covering layer 9 is laid, with the upper end of the waterproof membrane covering layer 9 fixed with a pressure strip 6. The upper end of the pressure strip 6 is fixed to the iron square plane under the eaves aluminum plate 7 of the parapet wall. The lower end of the waterproof membrane covering layer 9 is sealed to the waterproof membrane layer 4 with sealant (weather-resistant adhesive strip 11). The base of the waterproof membrane layer 4 is fixed to the pressure strip 6 with screws (iron disc nails). At this point, the lower end of the pressure strip 6 presses down on the waterproof membrane layer 4, and the waterproof membrane covering layer 9 covers the waterproof membrane layer 4. Finally, hot air welding is performed. (Reference) Figure 5 When the waterproof membrane 4 is laid to the point where it passes through the component 8 (such as at the smoke exhaust duct or skylight), the waterproof membrane layer 4 is bent upwards at least 300mm (the bend is fixed by the pressure strip 6 and fasteners), then bent towards the eaves plane of the component 8 and the waterproof membrane 4 is fully laid. It is then fixed to the eaves plane of the component 8 with aluminum trim strips 6 and fasteners, and sealed with sealant (weather-resistant adhesive strip 11). Finally, the waterproof membrane covering layer 9 is used for coverage. At this time, the membrane covering layer 9 is L-shaped, with one side bonded to the waterproof membrane layer 4 by weather-resistant adhesive strip 11, and the other side bonded to the upwardly bent waterproof membrane layer 4 by weather-resistant adhesive strip 11, thereby covering the pressure strip 6 and fasteners (iron disc nails) at the bend. (Reference) Figure 6When the large-area waterproof membrane is broken at the expansion joint and ridge, a waterproof membrane layer 4 is first laid at the expansion joint and ridge. Then, the waterproof membrane layer 4 at the expansion joint and ridge is broken. Simultaneously, a PE rod 10 is installed at the break point, extending in the direction of the expansion joint. The waterproof membrane layer 4 on both sides of the expansion joint and ridge is fixed with iron nails, and a pressure strip 6 is also installed at the fixing point. The iron nails pass through the pressure strip 6 to compress the waterproof membrane layer 4. Finally, a waterproof membrane covering layer 9 is laid on top of the PE rod 10 and the pressure strips 6 on both sides of the expansion joint and ridge. 9. Weather-resistant adhesive strips 11 are used to bond the waterproof membrane 4 between the edge and the lower layer on both sides. Finally, the iron nails are welded to the waterproof membrane covering layer 9 using the magnetic induction welding machine. By setting the membrane disconnection at the expansion joint and ridge and the buffer layer of PE rod 10, the waterproof membrane covering layer 9 with different widths is fully welded to the expansion joint and ridge to accommodate the expansion and contraction of the roof due to temperature stress and structural deformation, thus preventing the membrane from being torn. This forms a double-layer waterproof structure, eliminates the risk of water seepage in special areas, and improves the overall integrity of the roof waterproofing system. Through the above standardized fixing and sealing process, the roof treatment is more standardized.

[0055] In this embodiment, the profiled steel sheet has a crest and a trough. The fastener 5 is vertically fixed on the crest of the profiled steel sheet base layer 1. By utilizing the structural stress characteristics of the crest of the profiled steel sheet, the iron rivets are vertically fixed on the crest, so that the force of the fastener 5 is directly transmitted to the main stress-bearing rib of the profiled steel sheet, avoiding the stress dispersion problem when fixed on the trough.

[0056] In step 2), the air barrier layer 2 is a PE film air barrier layer 2, and the overlap method is a water-flow overlap treatment with an overlap width ≥100mm. The overlap part is bonded with 10×1mm butyl tape to form a sealed and compacted sealing part; thereby forming a continuous and sealed sealing part structure to prevent indoor water vapor from penetrating upward to the insulation layer 3; and the compaction treatment after bonding strengthens the bonding between the butyl tape and the PE film, avoids air barrier failure caused by interlayer gaps, and improves the durability of the air barrier layer 2.

[0057] Specifically, in step 2), the vapor barrier 2 with a width of ≥10mm is sealed at the overlapping and closing parts, roof openings and surrounding areas, and compacted with a pressure roller. This special sealing at the roof openings and surrounding areas eliminates the risk of water vapor penetration at the base of equipment and pipes, and forms a connection with the subsequent joint treatment of the waterproof membrane, thereby improving the overall sealing performance of the roof waterproofing system.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for constructing a waterproof membrane for a steel structure roof, wherein the roof structure comprises, from bottom to top, a profiled steel sheet base layer (1), an air barrier layer (2), a thermal insulation layer (3), and a waterproof membrane layer (4), characterized in that, It includes the following steps: 1) Substrate treatment: Level and clean the profiled steel sheet substrate (1), removing protrusions, depressions, accumulated water and sharp foreign objects; 2) Laying the vapor barrier layer (2): Lay the vapor barrier layer (2) on the surface of the profiled steel sheet substrate (1), using the downstream lap method, and bonding, sealing and compacting the lap and closing parts; 3) Installing the insulation layer (3) and fasteners (5): The fastener (5) is an iron disc nail. Lay the insulation layer (3) above the vapor barrier layer (2), and fix the insulation layer (3) to the profiled steel sheet substrate (1) through at least one fastener (5) with a hot-melt layer at the top; 4) Determining the welding temperature: Lay part of the waterproof coiled material, set at least one temperature range for trial welding according to the ambient temperature, and conduct a peel test on the waterproof coiled material after trial welding to determine the welding temperature range that meets the qualified standard; 5) Laying and welding the waterproof coiled material: Draw a line for positioning on the insulation layer (3), then lay the waterproof coiled material on the insulation layer (3) along the line. Use a magnetic induction welding machine with a self-seeking function to adsorb the top of the fastener (5) and heat its hot-melt layer, so that the top of the fastener (5) and the back of the waterproof coiled material are melted and welded; 6) Cooling and strengthening: Use an aluminum porous radiator with a magnetic adsorption self-seeking function to suppress and cool the welding part to strengthen the connection strength, and alternate welding and cooling in a cycle; 7) Coiled material lap treatment: Weld the lap edges of the waterproof coiled material and press in the weather-resistant adhesive strip; 8) Detail node treatment: Seal, fix and weld the T-joints, roof peripheries, penetrating components, expansion joints and ridge parts on the steel structure roof; 9) Inspection and acceptance: Conduct quality inspection on the completed waterproof coiled material layer (4).

2. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: The insulation layer (3) includes two layers of rock wool board insulation layers (3) laid in parallel up and down. Each layer of the insulation layer (3) is composed of several rock wool boards laid with staggered joints, and the rock wool boards between the upper and lower layers of the insulation layer (3) are laid with staggered joints.

3. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: In step 4), the specific steps for determining the welding temperature are: Before construction, lay part of the waterproof coiled material, and set three different temperature ranges for trial welding in sequence from low to high according to the ambient temperature. Conduct a peel test on the test piece after each trial welding. Take the non-peeling of the fastener (5) and the coiled material when the coiled material is damaged as the qualified standard, and determine the temperature range of the first to meet the qualified standard as the welding temperature range.

4. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: The arrangement of the fasteners (5) is divided into a dense area and a non-dense area. A circle around the light steel roof is a "square" - shaped dense area, and the middle of the dense area is the non-dense area; The center distance of the fasteners (5) in the dense area is 0.6m×0.48m, the center distance of the fasteners (5) in the non-dense area is 0.6m×0.72m, and the number of fasteners (5) for each rock wool board is at least two.

5. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: In step 7), the overlap of adjacent waterproof membranes is hot-air welded and weather-resistant adhesive strips are pressed in. During welding, a crawler welding machine and a handheld welding machine are used. The crawler welding machine has a welding speed of 2.5-3m / min, an overlap width of 75-100mm, and an effective welding width of more than 25mm. The handheld welding machine has a welding gun temperature controlled at 250~450℃ and a welding speed of 0.2~0.5m / min. During welding, the welding nozzle is at a 45° angle to the welding direction, and the pressure roller is parallel to the welding nozzle and maintains a distance of 30-35mm.

6. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: In step 8), the T-joint is processed as follows: the roll material within a range of at least 10cm in the T-joint area is cut, the front end of the weld is cut into a bevel, and then a circular TPO roll material with a diameter of at least 10cm is cut and welded onto the T-joint. It is first spot welded and then the surrounding area is welded firmly.

7. The construction method for waterproof membrane on steel structure roofs according to claim 6, characterized in that: The roof perimeter and at least one through-beam are fixed with pressure strips, and the screw spacing is 300mm. The large rolls of material at the expansion joints and the ridge are installed separately, fixed with pressure strips, and then PE rods are installed. The roll covering layer is then welded to the waterproof rolls on both sides. The width of the roll covering layer at the expansion joint is 500mm, and the width of the roll covering layer at the ridge is 650mm.

8. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: The profiled steel sheet has a crest and a trough, and the fastener (5) is vertically fixed on the crest of the profiled steel sheet base layer (1).

9. The construction method for waterproof membrane on steel structure roofs according to claim 1, characterized in that: In step 2), the air barrier layer (2) is a PE film air barrier layer (2), the overlapping method is a water-flow overlapping treatment, the overlap width is ≥100mm, and the overlapping part is bonded with 10×1mm butyl tape to form a sealed and compacted sealing part.

10. The construction method of waterproof membrane for steel structure roofs according to claim 9, characterized in that: In step 2), the air barrier layer (2) at the overlap and closing parts, roof openings and surrounding parts is sealed with waterproof sealing tape with a width of ≥10mm and compacted with a pressure roller.

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