Construction method of super-long single-pitch roof deformation joint waterproof node

Abstract

The present application relates to the technical field of steel structure roof construction, in particular to a construction method of a super-long single-pitch roof deformation joint waterproof node, comprising: determining the deformation joint position according to the longest length requirement of the single-pitch roof, disconnecting the roof beam to form a segmented roof system and calculating and determining the deformation joint width; constructing the two side columns, beams and purlins and forming a height difference between the two side beams; laying the roof panel and disconnecting it at the deformation joint; continuously laying the waterproof coiled material across the deformation joint after the base layer treatment of the roof panel and reserving a downward section vertically into the joint; and filling the polyethylene foam rod into the deformation joint. The present application can effectively release the deformation of the super-long single-pitch roof caused by thermal expansion and cold contraction, reduce the cracking and leakage of the roof panel, improve the waterproof performance and service life of the roof, and has simple construction process, controllable quality and low cost.

Description

Technical Field

[0001] This invention relates to the field of steel structure roof construction technology, specifically a construction method for waterproof joints of expansion joints in ultra-long single-slope roofs. Background Technology

[0002] With economic growth and market demand, industrial production scale continues to expand, and coupled with land use restrictions, multi-span combined factory buildings are becoming increasingly common. In recent years, with the increasing emphasis on building waterproofing performance and the quality of waterproofing projects, waterproofing requirements have gradually increased. Single-slope roofs offer direct drainage paths, effectively reducing the risk of seepage caused by internal gutters. Furthermore, with the implementation of national energy conservation and emission reduction policies and the vigorous development of green buildings, the application of photovoltaic roofs in industrial buildings has become a future trend, and large-area single-slope roofs are ideal locations for installing solar photovoltaic panels. Based on these reasons, the application of ultra-long single-slope roofs is becoming increasingly widespread and has developed into a design trend.

[0003] However, due to the thermal expansion and contraction of materials and the deflection deformation of the structure itself, ultra-long single-slope roofs are prone to stress concentration, leading to damage to the roof panels and causing leaks in the factory, which greatly affects production and equipment. Article 18.2.2 of the "Steel Structure Design Standard" GB 50017-2017 stipulates: "When the building is long, temperature expansion joints should be installed. The spacing of temperature expansion joints should be determined by calculation based on factors such as the structural type, temperature changes, structural constraints, and material properties, and should comply with the provisions of current national standards." However, neither the national standard atlas "Engineering Practices" 23J909 nor "Construction of Profiled Metal Sheets" 17J925-1 provides a directly applicable method for the disconnection of ultra-long single-slope color steel sheet roofs.

[0004] In existing technologies, the construction of roof expansion joints is mostly aimed at concrete roofs or double-slope roofs. The common practice is to simply fill the joint with material and then cover it with a cover plate. However, when used for extra-long single-slope corrugated steel roofs, the following problems exist: First, it cannot effectively release the deformation and stress caused by thermal expansion and contraction of the roof, making the roof panels prone to cracking; second, the waterproofing treatment at the joint is simple, resulting in poor waterproofing reliability and easy leakage; third, the loads such as people walking on the roof for maintenance and snow accumulation directly act on the waterproofing layer, making it prone to localized excessive stress and damage; fourth, there is a lack of systematic and standardized construction processes, making it difficult to guarantee construction quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a construction method for waterproof joints of ultra-long single-slope roofs. Through systematic construction steps and specific joint construction treatment, the deformation of the roof caused by thermal expansion and contraction can be effectively released, thereby improving the waterproof performance and service life of the roof and effectively solving the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a construction method for waterproof joints in ultra-long single-slope roof expansion joints, comprising the following steps: S1. Measurement, layout, and joint cutting: Based on the functional requirements of the factory building and the maximum length requirement of the single-slope roof, determine the location of the expansion joint in the roof span direction, cut off the roof beams on both sides of the location to form a segmented roof system, and calculate and determine the width of the expansion joint based on the structural type, temperature changes, structural constraints, and material properties.

[0007] S2. Construction of the support system: Construct the first and second columns located on both sides of the expansion joint, connect the first beam to the first column, connect the second beam to the second column, and make the second beam higher than the first beam; install the first roof purlin on the first beam, and install the second roof purlin on the second beam.

[0008] S3. Roof panel installation: The roof panels are laid on the upper side of the first and second roof purlins. The roof panels are broken at the expansion joint, and a height difference is formed between the roof panels on both sides of the expansion joint to meet the backflow requirements.

[0009] S4. Waterproofing layer installation: After the surface of the roof panel is treated, waterproof membrane is continuously laid on the upper side of the roof panel, so that the waterproof membrane crosses the expansion joint and covers the roof panels on both sides of the expansion joint, and the waterproof membrane is reserved at the expansion joint to hang down into the expansion joint.

[0010] S5. Sealing: Fill the expansion joint with polyethylene foam rods.

[0011] S6. Load Dispersion: Multiple load dispersion ropes are laid on the upper side of the waterproof membrane.

[0012] S7. Central Fixing: Cover the upper side of the waterproof membrane with a color steel roof, and use U-shaped pressure strips and first self-tapping screws to fix the waterproof membrane to the roof panel.

[0013] S8. Edge finishing: Using finishing strips and second self-tapping screws on both sides of the expansion joint, the edge of the waterproof membrane on one side of the expansion joint is anchored to the second roof purlin.

[0014] S9. Sealing: Fill the gap between the sealing strip and the roof panel with silicone sealant to form a dynamic seal.

[0015] Furthermore, in step S1, when calculating and determining the width of the expansion joint, the amount of temperature expansion is calculated based on the local maximum temperature change range, the linear expansion coefficient of the roof panel and roof purlin, and the segment length of the single-slope roof. The width of the expansion joint shall not be less than the sum of the amount of temperature expansion and the construction error allowance.

[0016] Furthermore, in step S2, the height difference between the second beam and the first beam is 350mm; in step S3, the height difference between the roof panels on both sides of the expansion joint is 350mm, and correspondingly, the height difference between the color steel roof panels on both sides of the expansion joint is 350mm.

[0017] Furthermore, in step S4, the pre-existing sagging length of the drooping section of the waterproof membrane is greater than the maximum relative displacement of the roof on both sides of the expansion joint under temperature changes; the overlap width between adjacent waterproof membranes is not less than 80mm, and the overlap is bonded by hot air welding or special adhesive and rolled to be compact.

[0018] Further, in step S5, a polyethylene foam rod with a diameter of 1.25 to 1.5 times the width of the expansion joint is selected. The polyethylene foam rod is compressed and embedded in the upper end of the expansion joint, and the polyethylene foam rod is located on the upper side of the drooping section of the waterproof membrane. After the filling is completed, a cover plate strip is installed on the upper side of the polyethylene foam rod, and the two flanges of the cover plate strip are respectively pressed onto the waterproof membrane on both sides of the expansion joint.

[0019] Furthermore, in step S6, multiple waterproof membrane load-dispersing ropes extend along the roof slope direction and are spaced apart along the length of the expansion joint. The two ends of the waterproof membrane load-dispersing ropes are fixed to the roof on both sides of the expansion joint. The waterproof membrane load-dispersing ropes are made of weather-resistant nylon rope, polyester fiber rope or galvanized steel wire rope, with a rope diameter of 8mm~12mm.

[0020] Furthermore, in step S7, the U-shaped pressure strip and the first self-tapping screw are arranged along the length of the expansion joint with a spacing of 250mm, and the first self-tapping screw penetrates the color steel plate roof, the waterproof membrane and the roof panel in sequence.

[0021] Furthermore, in step S9, the silicone sealant is a high-elasticity silicone sealant. Before filling, the gap is cleaned and a backing material is set. After filling, the ratio of the width to the depth of the sealant gap is 2:1. After filling, it is cured for more than 24 hours.

[0022] Furthermore, the construction method also includes step S10, quality inspection: after construction is completed, a water spray test or a post-rain inspection is carried out on the joint of the expansion joint to confirm that there is no leakage.

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention breaks the roof beam at appropriate locations while meeting the single-slope length requirements of the specifications, forming a segmented roof system and setting expansion joints. The width of the expansion joints is determined by calculation. This can effectively release the structural deformation and stress concentration caused by thermal expansion and contraction of the roof and excessive roof length, reduce cracking and leakage of roof panels, and ensure structural safety.

[0024] 2. The beams, purlins, and roof on both sides of the expansion joint form a height difference to meet the requirements for backwater protection, ensure smooth drainage, and prevent rainwater from entering the joint. The waterproof membrane continuously spans the expansion joint to form a continuous waterproof layer. Polyethylene foam rods are filled into the expansion joint, and high-elasticity silicone sealant is filled at the closing part to form a dynamic seal. This constitutes a multi-layer waterproof system of "backwater height difference + continuous membrane + elastic sealant + dynamic sealant", which improves the waterproof reliability of the joint.

[0025] 3. The waterproof membrane has a pre-existing droop at the expansion joint, and the droop length is greater than the maximum relative displacement of the roof on both sides. This can adapt to the repeated expansion and contraction of the expansion joint and prevent the waterproof membrane from being torn and damaged.

[0026] 4. Multiple load-dispersing ropes are laid on the upper side of the waterproof membrane, which can effectively disperse the load generated by the roof panel due to factors such as people walking on it and snow accumulation, prevent the waterproof membrane from being damaged due to excessive local stress, extend the service life of the waterproof layer, and at the same time serve as a walking path for the installation and maintenance of roof photovoltaic panels.

[0027] 5. The waterproof membrane is fixed in the middle with a U-shaped pressure strip and a first self-tapping screw at 250mm intervals. The edges are directly anchored to the roof purlins with a closing pressure strip and a second self-tapping screw. The fixation is reliable and prevents the waterproof membrane from warping and water from entering.

[0028] 6. The construction process of this invention is clear, highly standardized, easy to construct, and has controllable quality, which reduces construction costs and fills the gap in the standard drawing set for the construction of broken nodes of ultra-long single-slope roofs, providing convenience for the design and construction of similar projects in the future. Attached Figure Description

[0029] Figure 1 This is a process flow diagram of the construction method for the waterproof joint of the ultra-long single-slope roof expansion joint of the present invention; Figure 2 This is a cross-sectional structural diagram of a waterproof joint node for an ultra-long single-slope roof expansion joint constructed using the construction method of this invention.

[0030] In the diagram: 1 First column, 11 Second column, 2 First beam, 21 Second beam, 3 First roof purlin, 31 Second roof purlin, 4 Waterproof membrane, 5 Expansion joint, 6 Polyethylene foam rod, 7 Color steel roof, 8 Waterproof membrane load-bearing rope, 9 First self-tapping screw, 10 Silicone sealant, 12 Second self-tapping screw. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0032] This embodiment takes an extra-long single-slope corrugated steel roof of a multi-span combined factory building as an example. The length of this roof along the slope direction exceeds the maximum allowable length of a single slope according to regulations, requiring expansion joints to be installed at appropriate locations for segmentation. The construction method of this invention is used to construct the waterproof joint of the extra-long single-slope roof, as follows: Figure 1 and Figure 2 As shown, the specific steps include the following: S1. Measurement, layout, and cutting / opening of joints: Based on the functional requirements of the factory building and the provisions of Article 18.2.2 of the "Steel Structure Design Standard" GB 50017-2017 regarding temperature expansion joints, the maximum allowable length of the single-slope roof is determined. A suitable location is selected in the roof span direction (i.e., along the roof slope direction) as the location for setting expansion joint 5. The roof beams on both sides of the setting location are broken to form a segmented roof system, so that each segment of the roof can expand and contract independently.

[0033] The width of expansion joint 5 is determined by calculation based on the local maximum temperature variation ΔT and the linear expansion coefficient α of the roof panels and purlins (the linear expansion coefficient of steel is approximately 1.2 × 10⁻⁻). 5 The temperature expansion and contraction amount is calculated using the formula ΔL=α·L·ΔT, based on the segment length L of the single-slope roof (°C) and the temperature. The width of the expansion joint 5 should not be less than the sum of this temperature expansion and contraction amount and the construction error allowance (generally taken as 10mm~20mm). In this embodiment, the calculated width of the expansion joint 5 is 50mm. During the layout, the center line and edge line of the expansion joint 5 are marked on both sides of the structure as the control basis for subsequent construction.

[0034] S2. Construction of the support system: Construction is carried out on both sides of expansion joint 5, using first column 1 and second column 11, both of which are H-shaped steel columns. First beam 2 is connected to the top of first column 1, and second beam 21 is connected to the top of second column 11. Both first beam 2 and second beam 21 are H-shaped steel beams, and the columns and beams are connected by bolts or welding. During construction, the installation elevation of second beam 21 is controlled to be higher than that of first beam 2; in this embodiment, the height difference is 350mm.

[0035] Then, a first roof purlin 3 is installed on the upper side of the first beam 2, and a second roof purlin 31 is installed on the upper side of the second beam 21. Both the first roof purlin 3 and the second roof purlin 31 are made of C-shaped or Z-shaped thin-walled steel and are bolted to the upper flange of the beam. Accordingly, the second roof purlin 31 is higher than the first roof purlin 3.

[0036] S3. Roof panel installation: Roof panels are laid on the upper side of the first roof purlin 3 and the second roof purlin 31. The roof panels can be made of profiled steel sheets or precast concrete slabs and are fixed to the roof purlins with self-tapping screws or bolts. The roof panels are broken at the expansion joint 5, and the ends of the panels on both sides of the break are neat. Due to the height difference of the beams and purlins on both sides, a height difference of 350mm is formed between the roof panels on both sides of the expansion joint 5, which meets the backflow requirements and ensures that the roof drainage flows smoothly along the slope, preventing rainwater from flooding into the expansion joint 5.

[0037] S4. Waterproofing layer laying: First, perform base treatment: clean the oil, dust and debris from the surface of the roof panels, check the flatness of the panel surface and the fixing screws, tighten any loose screws, repair any defects on the panel surface, and ensure that the base is flat, dry and clean.

[0038] Then, a waterproof membrane 4 is continuously laid on the upper side of the roof panel. The waterproof membrane 4 is a high-strength flexible waterproof membrane, such as TPO waterproof membrane, PVC waterproof membrane, or EPDM waterproof membrane, with a thickness of not less than 1.2mm. During laying, it is carried out from the lower part of the roof to the upper part, ensuring a tight fit between the waterproof membrane 4 and the roof panel. The waterproof membrane 4 continuously crosses the expansion joint 5 and covers the roof panels on both sides of the expansion joint 5, forming a continuous waterproof layer. The waterproof membrane 4 is not taut at the expansion joint 5, leaving a drooping section that extends into the expansion joint 5. The drooping length of this drooping section is greater than the maximum relative displacement of the roof on both sides of the expansion joint 5 under temperature changes. In this embodiment, the drooping depth is approximately 100mm to accommodate the expansion and contraction of the expansion joint 5 and prevent the waterproof membrane 4 from tearing.

[0039] The overlap width between adjacent waterproof membrane 4 shall not be less than 80mm, and in this embodiment it is 100mm. The overlap part shall be bonded by hot air welding or special adhesive according to the type of membrane, and then pressed tightly with a pressure roller to ensure continuous sealing of the overlap part.

[0040] S5. Sealing: Polyethylene foam rods 6 are inserted into the expansion joint 5. Polyethylene foam rods 6 with a diameter 1.25 to 1.5 times the width of the expansion joint 5 are selected. In this embodiment, the width of the expansion joint 5 is 50 mm, and polyethylene foam rods 6 with a diameter of 60 mm to 75 mm are selected. During insertion, the polyethylene foam rods 6 are compressed and embedded into the upper end of the expansion joint 5, positioning them above the drooping section of the waterproof membrane 4, using their elasticity to tightly seal them within the joint. The polyethylene foam rods 6 not only prevent collisions between the components on both sides of the expansion joint 5 and provide a dustproof seal, but also support and protect the drooping section of the waterproof membrane 4, preventing it from being trampled or damaged by debris.

[0041] After the filling is completed, a cover plate and pressure strip are installed on the upper side of the polyethylene foam rod 6. The cover plate and pressure strip are made of 0.8mm thick galvanized steel plate or 1mm thick aluminum alloy plate. Its two flanges are pressed onto the waterproof membrane 4 on both sides of the expansion joint 5 to cover and protect the polyethylene foam rod 6 and the joint of the expansion joint 5, and to prevent aging due to direct ultraviolet radiation and debris from falling in.

[0042] As an alternative implementation, polyethylene foam rods 6 can also be filled inside the expansion joint 5 and located on the underside of the waterproof membrane 4, directly providing support for the waterproof membrane 4, which can also achieve the purpose of preventing component collision and sealing against dust.

[0043] S6. Load Dispersion: Multiple load-distributing ropes 8 are laid on the upper side of the waterproof membrane 4. These ropes are made of weather-resistant nylon, polyester fiber, or galvanized steel wire, with a diameter of 8mm to 12mm. The ropes extend along the roof slope and are spaced apart along the length of the expansion joint 5. The spacing between adjacent ropes can be adjusted according to actual conditions, generally 300mm to 500mm. Both ends of the ropes 8 are fixed to the roof surface on both sides of the expansion joint 5, and can be anchored to the eaves, ridge, or pressed under the molding strip. The load-distributing ropes 8 can distribute and transfer concentrated loads on the roof panels caused by people walking on them, snow accumulation, etc., along the rope length, preventing excessive local stress and damage to the waterproof membrane 4. They also serve as walkways for roof maintenance personnel, facilitating the installation and maintenance of roof photovoltaic panels.

[0044] S7, Central fixation: A color steel roofing sheet 7 is placed on top of the waterproof membrane 4. The color steel roofing sheet 7 can be made of aluminum-zinc coated profiled steel sheet with a thickness of, for example, 0.6 mm. The color steel roofing sheet 7 is discontinuous at the expansion joint 5. A U-shaped pressure strip and a first self-tapping screw 9 are used to fix the middle part of the waterproof membrane 4 to the roofing sheet. The U-shaped pressure strip and the first self-tapping screw 9 are arranged along the length of the expansion joint 5 with a spacing of 250 mm. The first self-tapping screw 9 penetrates the color steel roofing sheet 7 (with a pre-reserved seam or opening at the corresponding position), the waterproof membrane 4, and the roofing sheet in sequence, and is equipped with an EPDM sealing washer to ensure the sealing at the fixing point. The U-shaped pressure strip increases the bearing area, preventing the waterproof membrane 4 from tearing at the fixing point.

[0045] S8. Edge finishing: On both sides of the expansion joint 5, sealing strips and second self-tapping screws 12 are used to anchor the edges of the waterproof membrane 4 on both sides of the expansion joint 5, together with the flanges of the cover strip, to the first roof purlin 3 and the second roof purlin 31. The sealing strip is a special metal sealing strip. The second self-tapping screw 12 penetrates the sealing strip, the waterproof membrane 4 and the roof panel and then drives into the roof purlin, providing strong anchoring force and effectively preventing the edges of the waterproof membrane 4 from lifting and water from entering.

[0046] S9, Sealing: Fill the gap between the sealing strip and the roof panel with silicone sealant 10. Silicone sealant 10 is a high-elasticity silicone sealant. Before filling, clean the gap to remove oil and dust, and place a backing material at the bottom of the gap, controlling the width-to-depth ratio of the sealant joint to be 2:1. During filling, apply the sealant continuously, compacting and smoothing it. After filling, cure for at least 24 hours, avoiding disturbance during this period. After curing, silicone sealant 10 forms a dynamic seal, elastically expanding and contracting with the expansion joint 5, maintaining a long-term waterproof effect.

[0047] S10. Quality Inspection: After construction is completed, a water spray test or post-rain inspection shall be carried out on the joint of expansion joint 5: the joint shall be continuously sprayed with water for no less than 30 minutes, or the joint shall be inspected after natural rainfall. If no leakage is found, the joint is considered qualified. If leakage is found, the cause shall be identified and the corresponding part shall be repaired and then re-inspected. Example 2:

[0048] The difference between this embodiment and embodiment 1 is that the width of the expansion joint 5 is calculated to be 80mm, and a polyethylene foam rod 6 with a diameter of 100mm to 120mm is selected accordingly; the load-dispersing rope 8 of the waterproof membrane is a galvanized steel wire rope with a diameter of 10mm and a spacing of 400mm; the remaining construction steps are the same as in embodiment 1.

[0049] In the above embodiments, the specific values ​​of the width of the expansion joint 5, the material specifications of each component, the diameter and spacing of the ropes are all preferred values. In actual engineering, they can be adjusted according to design calculations and usage requirements, without affecting the implementation of the technical solution of the present invention.

[0050] The specific connection methods mentioned in this application, such as fixed connections or settings, include but are not limited to conventional connection methods such as integral molding, welding, bolt connection, riveting, and adhesive bonding.

[0051] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for waterproof joints in ultra-long single-slope roof expansion joints, characterized in that, Includes the following steps: S1. Measurement, layout and joint cutting: Based on the functional requirements of the factory building and the maximum length requirement of the single-slope roof, determine the location of the expansion joint (5) in the roof span direction, cut off the roof beams on both sides of the location to form a segmented roof system, and calculate and determine the width of the expansion joint (5) according to the structural type, temperature change, structural constraints and material properties. S2. Construction of the support system: Construct the first column (1) and the second column (11) located on both sides of the expansion joint (5), connect the first beam (2) on the first column (1), connect the second beam (21) on the second column (11), and make the second beam (21) higher than the first beam (2); install the first roof purlin (3) on the first beam (2), and install the second roof purlin (31) on the second beam (21); S3. Roof panel installation: The roof panel is installed on the upper side of the first roof purlin (3) and the second roof purlin (31). The roof panel is broken at the expansion joint (5), and a height difference is formed between the roof panels on both sides of the expansion joint (5) to meet the backwater requirements. S4. Waterproofing layer installation: After the surface of the roof panel is treated, waterproof membrane (4) is continuously laid on the upper side of the roof panel so that the waterproof membrane (4) crosses the expansion joint (5) and covers the roof panels on both sides of the expansion joint (5), and the waterproof membrane (4) is reserved at the expansion joint (5) for a downward section to hang into the expansion joint (5). S5. Filling the joint: Fill the expansion joint (5) with polyethylene foam rods (6); S6. Load Dispersion: Lay multiple load dispersion ropes (8) on the upper side of the waterproof membrane (4). S7. Central fixing: Cover the upper side of the waterproof membrane (4) with the color steel roof (7), and use U-shaped pressure strips and first self-tapping screws (9) to fix the waterproof membrane (4) to the roof panel; S8. Edge finishing: Using finishing strips and second self-tapping screws (12) on both sides of the expansion joint (5), the edge of the waterproof membrane (4) located on one side of the expansion joint (5) is anchored to the second roof purlin (31). S9. Sealing: Fill the gap between the sealing strip and the roof panel with silicone sealant (10) to form a dynamic seal.

2. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S1, when calculating and determining the width of the expansion joint (5), the temperature expansion amount is calculated based on the local maximum temperature change range, the linear expansion coefficient of the roof panel and roof purlin, and the segment length of the single-slope roof. The width of the expansion joint (5) is not less than the sum of the temperature expansion amount and the construction error allowance.

3. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S2, the height difference between the second beam (21) and the first beam (2) is 350mm; in step S3, the height difference between the roof panels on both sides of the expansion joint (5) is 350mm, and correspondingly, the height difference between the color steel roof panels (7) on both sides of the expansion joint (5) is 350mm.

4. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S4, the pre-existing sagging length of the drooping section of the waterproof membrane (4) is greater than the maximum relative displacement of the roof on both sides of the expansion joint (5) under temperature change; the overlap width between adjacent waterproof membranes (4) is not less than 80mm, and the overlap is bonded by hot air welding or special adhesive and rolled to be compact.

5. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S5, a polyethylene foam rod (6) with a diameter of 1.25 to 1.5 times the width of the expansion joint (5) is selected. The polyethylene foam rod (6) is compressed and then embedded in the upper end of the expansion joint (5), and the polyethylene foam rod (6) is located on the upper side of the drooping section of the waterproof membrane (4). After the filling is completed, a cover plate strip is installed on the upper side of the polyethylene foam rod (6), and the two flanges of the cover plate strip are respectively pressed onto the waterproof membrane (4) on both sides of the expansion joint (5).

6. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S6, multiple waterproof membrane load-dispersing ropes (8) extend along the roof slope direction and are arranged at intervals along the length direction of the expansion joint (5). The two ends of the waterproof membrane load-dispersing ropes (8) are respectively fixed to the roof on both sides of the expansion joint (5).

7. A construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1 or 6, characterized in that: The load-dispersing rope (8) of the waterproof membrane is made of weather-resistant nylon rope, polyester fiber rope or galvanized steel wire rope, with a rope diameter of 8mm~12mm.

8. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S7, the U-shaped pressure strip and the first self-tapping screw (9) are arranged along the length of the expansion joint (5) with a spacing of 250mm. The first self-tapping screw (9) penetrates the color steel roof (7), the waterproof membrane (4) and the roof panel in sequence.

9. The construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to claim 1, characterized in that: In step S9, the silicone sealant (10) is a high-elasticity silicone sealant. Before filling, the gap is cleaned and a backing material is set. After filling, the ratio of the width to the depth of the sealant gap is 2:

1. After filling, it is cured for more than 24 hours.

10. A construction method for a waterproof joint of an ultra-long single-slope roof expansion joint according to any one of claims 1-9, characterized in that, It also includes step S10, quality inspection: After the construction is completed, a water spray test or a post-rain inspection is carried out on the joint of the expansion joint (5) to confirm that there is no leakage.

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