A kind of planting roof and outer wall deformation joint cover board junction place anti-leakage device
Patent Information
- Application Number
- CN202522478001.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-21
AI Technical Summary
[0005]本实用新型旨在克服现有种植屋面与外墙变形缝盖板交界处因材料不连续、悬挑根部易裂、滴水线老化等导致的渗漏隐患，提供一种施工便捷、连接可靠、外形简洁且耐久性好的防渗漏装置，以实现交界部位长期密封、免悬挑、免后期频繁维护的目标
广适配：构造总高度≤40 mm，不占用屋面保温及覆土厚度，新建与改造项目均可直接植入。
Smart Images
Figure CN224859111U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waterproofing technology for expansion joints in building engineering, and in particular to a seepage prevention device at the junction of the expansion joint cover plate of cast-in-place concrete on green roof and the metal expansion joint cover plate of exterior wall. Background Technology
[0002] Green roofs typically use concrete structures at the expansion joint covers, while exterior wall expansion joint covers are mostly metal components. The two materials differ significantly in properties, thickness, and coefficient of thermal expansion, making it difficult to form an effective overlap at the junction, easily leaving straight gaps. Rainwater seeps into the expansion joint along these gaps and can enter the interior through capillary action, leading to common quality problems such as leakage, dampness, and insulation failure.
[0003] The current conventional practice is to extend the end of the concrete expansion joint cover plate on the roof outward by about 100mm and install a drip line or drip edge to deflect rainwater off the exterior wall. However, this solution has the following shortcomings: 1. The cantilevered section requires separate formwork and support, which poses a high risk of working at height and results in low construction efficiency; 2. Cracks are prone to form at the base of the cantilever due to concrete shrinkage, temperature stress, or vibration, creating new leakage channels. 3. The drip line / eagle beak is exposed to wind and rain for a long time, which makes it prone to aging and damage, requiring frequent inspection and repair, resulting in high maintenance costs; 4. Cantilevered concrete affects the flatness and aesthetics of the facade and increases the load on the eaves.
[0004] Therefore, there is an urgent need for a waterproofing device that is easy to construct, has reliable connections, a simple appearance, and good durability to solve the leakage problem at the junction of the green roof and the expansion joint cover plate of the exterior wall. Utility Model Content
[0005] This utility model aims to overcome the potential leakage problems caused by material discontinuity, easy cracking at the cantilever root, and aging of the drip line at the junction of the existing green roof and the expansion joint cover plate of the exterior wall. It provides a leak-proof device that is easy to construct, reliable in connection, simple in appearance, and durable, so as to achieve the goal of long-term sealing of the junction, eliminating the need for cantilever and frequent maintenance in the later stage.
[0006] To achieve the above objectives, this utility model is implemented as follows: A seepage prevention device at the junction of a green roof and an exterior wall expansion joint cover plate includes a cast-in-place concrete expansion joint cover plate 1, an exterior wall metal expansion joint cover plate 3, and an L-shaped metal cover plate 5. The horizontal arm 5a of the L-shaped metal cover plate 5 covers and is fixed to the top surface of the roof sill 2, and the vertical arm 5b overlaps with the exterior wall metal expansion joint cover plate 3. It is fixed in a dual mode using expansion bolts 6 and construction adhesive 7. The overlap is fully filled with sealant 8 to form a continuous sealed waterproof strip, thereby eliminating the traditional concrete cantilever and drip line and achieving long-term sealing at the junction.
[0007] Furthermore, the horizontal arm of the L-shaped metal cover plate 5 extends into the cast-in-place concrete expansion joint cover plate for a length ≥200 mm, and the overlap width between the longitudinal arm and the external wall metal expansion joint cover plate is ≥ the width of the external wall metal cover plate, ensuring that the overlap range completely covers the gap and preventing rainwater from directly impacting the sealing interface.
[0008] Furthermore, the expansion bolts 6 are arranged equidistantly along the longitudinal arm axis with a spacing of 150-250 mm, and are anchored into the base layer of the outer wall for ≥40 mm. Together with the construction adhesive 7, they form a double guarantee of "mechanical anchoring + adhesive bonding", which improves the wind pressure resistance and long-term fatigue performance.
[0009] Furthermore, the building adhesive 7 is a weather-resistant silicone structural adhesive with a coating thickness of ≥4 mm and a length of ≥200 mm, which can compensate for the difference in thermal expansion and contraction between metal and concrete and block capillary seepage channels.
[0010] Furthermore, the sealant 8 is made of single-component weather-resistant polyurethane with a full filling depth of ≥5 mm and an outer surface with a rounded drainage slope to prevent water accumulation and improve durability.
[0011] Furthermore, the L-shaped metal cover plate 5 is made of aluminum alloy or stainless steel, with a plate thickness of 1.5-3 mm. The surface is coated with anti-rust primer and exterior finish paint, making it resistant to outdoor ultraviolet rays and acid rain corrosion, and its service life is synchronized with that of the exterior wall metal cover plate.
[0012] Furthermore, a waterproof membrane 9 is laid on the top surface of the roof sill 2. The membrane hangs down within the expansion joint and is turned down ≥200 mm on both sides of the sill. The L-shaped metal cover plate is fixed to the top of the sill by self-tapping screws 10. The screw heads are covered with sealant to form a double waterproof layer of "membrane + metal cover plate".
[0013] Furthermore, a polystyrene foam template 11, which also serves as an insulation layer, is provided below the cast-in-place concrete expansion joint cover plate 1. The edge of the L-shaped metal cover plate cross arm overlaps the top surface of the foam template, and a water-stop strip 12 is added at the overlap to improve the interface sealing and insulation continuity.
[0014] Furthermore, a decorative buckle 13 is provided on the outer side of the overlapping area between the exterior wall metal expansion joint cover plate 3 and the L-shaped metal cover plate 5. The buckle is snapped into the exterior wall metal cover plate to hide the expansion bolts and sealant, ensuring that the exterior facade is flat and beautiful.
[0015] Furthermore, all metal parts are pressed together in the direction of water flow, the top surface of the cross arm has a 2% outward slope, and the outer surface of the longitudinal arm has a vertical water-guiding groove 14, which can quickly drain rainwater, reduce the risk of long-term water immersion of sealant, and improve system durability.
[0016] Based on the above technical solution, this utility model establishes a four-layer barrier of "metal-adhesive-roll material-sealant" between the expansion joint cover plates of the green roof and the exterior wall, which are made of two different materials. The working principle and overall effect are as follows: Barrier principle As rainwater falls along the exterior wall, it is first diverted and depressurized by the decorative cover 13 and the vertical water-guiding groove 14. Upon reaching the junction area, the horizontal arm 5a of the L-shaped metal cover 5 forms the first water-retaining eaves, while the vertical arm 5b, together with the construction adhesive 7 and sealant 8 on the overlapping surface of the exterior wall metal expansion joint cover 3, forms the second elastic waterstop. The lower waterproof membrane 9 and the waterstop strip 12 constitute the third flexible waterproof layer. The mechanical clamping action of the innermost expansion bolt 6 continuously maintains the tight fit of each layer, forming the fourth durable compaction barrier. The four barriers dissipate energy and intercept water layer by layer, achieving dual-path protection of "external drainage and internal stop".
[0017] Overall effect Zero cantilever: Eliminates the traditional 100 mm concrete overhang and drip line, eliminating the risk of root cracking, and reducing the eaves load by ≥0.8 kN / m; Quick maintenance: Inspection or glue application can be done simply by loosening the decorative buckle cover, which can be completed by one person in 10 minutes, reducing subsequent maintenance costs by more than 60%; High durability: The metal cover plate is made of the same material as the exterior wall metal cover plate, and thermal expansion is synchronized. The sealant is in a compressed rather than stretched state, with a design life of ≥25 years. Aesthetically pleasing: The L-shaped cover is hidden inside the cover, resulting in a smooth and consistent exterior facade that can meet various finishing requirements such as curtain walls, paints, and aluminum panels; Widely adaptable: The total structural height is ≤40 mm, which does not occupy the roof insulation and soil covering thickness. It can be directly implanted in both new construction and renovation projects.
[0018] In summary, this utility model achieves long-term reliable seepage prevention with a simple structure, taking into account construction safety, facade aesthetics, and economic efficiency throughout the entire life cycle. It is suitable for waterproofing projects at the junction of various types of green roofs and external wall expansion joints. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the installation of the metal expansion joint cover plate on the exterior wall, showing the relative positions of the exterior wall 4, the retaining wall 2, and the metal cover plate 3; Figure 2 This is a structural diagram of the roof expansion joint filled with non-combustible thermal insulation material 11, showing the method of adhesive bonding. Figure 3 This is a diagram showing the installation of waterproof membrane at the top of the roof sill, illustrating the drooping of the membrane and the downward-turning nodes on both sides. Figure 4 This is the installation diagram of the L-shaped metal cover plate 5, which indicates the positions of the horizontal arm 5a, the longitudinal arm 5b, the expansion bolts 6, and the construction adhesive 7. Figure 5 This is a diagram showing the installation of polystyrene foam plastic template 11, which also serves as the insulation layer, above the roof expansion joint. Figure 6 This is a diagram showing the erection of supports 14 on both sides of the roof expansion joint and the forming of the cast-in-place concrete cover plate 1. Figure 7 This is a cross-sectional view showing the completed effect of the integrated anti-leakage device consisting of roof concrete expansion joint cover plate 1, exterior wall metal expansion joint cover plate 3, and L-shaped metal cover plate 5. Detailed Implementation
[0020] The following is in conjunction with the appendix Figures 1-7 This paper uses the example of "the junction between the green roof and the expansion joint of the exterior wall of a scientific research office building" to further illustrate the present invention. The example is for illustration only and does not limit the scope of protection of the present invention.
[0021] 1. Project Overview The rooftop planting area is approximately 1,200 m². 2 The parapet wall is 600 mm high, the exterior wall is an aluminum panel curtain wall, and the expansion joint width is 30 mm. Design requirements: eliminate the traditional concrete cantilever, the waterproofing level at the junction is ≥P6, the flatness deviation of the exterior facade is ≤2 mm, and the completed curtain wall does not need to be damaged for later maintenance.
[0022] 2. Construction process and corresponding steps in the attached drawings 2.1 Installation of metal expansion joint covers on exterior walls as follows Figure 1 Clean the debris from the seam and apply a primer to the inner wall of the seam; Install the metal expansion joint cover plate 3 along the exterior wall 4 according to the manufacturer's process. The folded edges on both sides of the cover plate are flush with the curtain wall keel, and the top elevation is 20 mm lower than the top surface of the roof sill 2, leaving space for the subsequent L-shaped metal cover plate 5 to overlap.
[0023] 2.2 Insulation filling inside the seam, such as Figure 2 Use density ≥120 kg / m³ 3 The non-combustible thermal insulation material 11 is cut into strips slightly larger than the seam width by 1 mm; Apply construction adhesive 7 to the back and press the insulation strip into the expansion joint. The top surface should be 10 mm lower than the top of the sill to form a flat base.
[0024] 2.3 Waterproof membrane laying method Figure 3 The top and sides of the second retaining wall are sanded smooth and coated with a cold primer. Lay 4 mm SBS modified bitumen waterproof membrane 9, which hangs down 30 mm inside the expansion joint, and turns down 200 mm on both sides of the retaining wall and fully adheres to the base layer; The roll material overlaps by 100 mm and is heat-sealed to form the first layer of flexible waterproofing.
[0025] 2.4 Installation of L-shaped metal cover plate Figure 4 The L-shaped metal cover plate 5 is prefabricated using 2 mm thick 316 stainless steel plate. The horizontal arm 5a is 250 mm long and extends ≥200 mm below the roof cover plate. The vertical arm 5b is 100 mm high and overlaps with the external wall metal cover plate with a width of 60 mm. Drill a hole at 200 mm along the axis of the longitudinal arm 5b, hammer in 6 M6×60 stainless steel expansion bolts, and anchor them into the base layer of the outer wall 4 by 45 mm. Apply a 5 mm thick layer of weather-resistant silicone structural adhesive 7 to the back, press the longitudinal arm onto the surface of the metal expansion joint cover plate 3 of the exterior wall, and keep the overlap smooth. At the junction of the cross arm 5a and the top surface of the inverted sill, add 10 self-tapping screws at 150 mm, and cover the screw heads with sealant 8 to ensure the metal-roll composite waterproofing.
[0026] 2.5 Template and insulation combined, such as Figure 5 A 30 mm thick polystyrene foam template 11 is laid on top of the waterproof membrane 9, covering the top surface of the inverted sill and extending outward by 50 mm, which also serves as insulation for the subsequent concrete cover plate. The top surface of the foam plastic is 5 mm lower than the top surface of the L-shaped metal cover arm 5a, forming a small step that facilitates rainwater drainage.
[0027] 2.6 Scaffolding erection and concrete cover slab pouring, as follows Figure 6 A temporary support frame 14 was erected using Φ48×3.5 mm steel pipes, with 300 mm of timber at the top, to support the bottom formwork of the cast-in-place concrete cover plate 1; The template extends outwards by a 150 mm counter-reinforcement, and the sides are reinforced with wire. Pour C30 fine aggregate concrete, reinforced with Φ6@150 double-layer bidirectional steel bars, vibrate to compact, and finish with a 2% outer slope; After 7 days of curing, the support frame is removed. The concrete cover plate 1 and the L-shaped metal cover plate 5 are tightly overlapped to jointly bear the upper planting soil and live load.
[0028] 2.7 Integrated molding and acceptance, as follows Figure 7 After the concrete strength is ≥C25, aluminum alloy decorative buckle 13 is fastened to the outside of the overlapping area of the metal expansion joint cover plate 3 and the L-shaped metal cover plate 5 on the exterior wall, with a foot depth of 15 mm and the surface flush with the finished surface of the curtain wall. All visible gaps are filled with sealant 8, and the sealant surface is made into an arc with a radius of 8 mm to meet drainage and thermal expansion and contraction requirements. Perform a 24-hour water sealing test with a water level of 50 mm. No leakage and no water accumulation are observed, and the test result is judged as qualified.
[0029] 3. Maintenance and Replacement After several years of operation, it is only necessary to remove the decorative buckle cover 13, check the integrity of the sealant 8, and reapply the adhesive when necessary. If the L-shaped metal cover plate 5 has local corrosion, the expansion bolts 6 can be loosened for integral replacement, without damaging the waterproof layer and the curtain wall.
[0030] Through the above steps, the present embodiment achieves the objectives of zero overhang at the junction, zero leakage, flat facade, and convenient maintenance, which fully verifies the reliability and practicability of the present utility model.
[0031] The foregoing is merely preferred embodiments of the present invention, and is not intended to limit the present invention in any form. Although the present invention has been disclosed above with reference to the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, may make partial modifications or equivalent variations to obtain equivalent embodiments by using the technical contents disclosed above. Any simple modifications, equivalent variations and amendments made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A leak-proof device at the junction of a green roof and an exterior wall expansion joint cover plate, characterized in that, include: A cast-in-place concrete expansion joint cover plate (1) is installed on top of the inverted sill (2) of the green roof; Metal expansion joint cover plate (3) is installed on the exterior facade of the exterior wall (4); L-shaped metal cover plate (5) has a horizontal arm (5a) and a vertical arm (5b). The horizontal arm (5a) covers and is fixed to the top surface of the inverted wall (2). The vertical arm (5b) overlaps with the metal expansion joint cover plate (3) of the outer wall and is simultaneously fixed by expansion bolts (6) and construction adhesive (7). The intersection of the horizontal arm (5a) and the vertical arm (5b) and the perimeter of the overlap are fully filled with sealant (8) to form a continuous sealed waterproof strip.
2. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall as described in claim 1, characterized in that, The length L1 of the horizontal arm (5a) of the L-shaped metal cover plate (5) extending below the cast-in-place concrete expansion joint cover plate (1) is ≥200 mm, and the overlap width B1 between the vertical arm (5b) and the external wall metal expansion joint cover plate (3) is ≥ the width of the external wall metal expansion joint cover plate (3).
3. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall according to claim 1 or 2, characterized in that, The expansion bolts (6) are arranged at intervals along the axis of the longitudinal arm (5b) with a spacing of 150-250 mm. The sleeves of the expansion bolts (6) are anchored into the base layer of the outer wall (4) by ≥40 mm.
4. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall as described in claim 1, characterized in that, The building adhesive (7) is a weather-resistant silicone structural adhesive with a coating thickness of ≥4 mm and a coating length of ≥200 mm.
5. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall as described in claim 1, characterized in that, The sealant (8) is a single-component weather-resistant polyurethane sealant with a full filling depth of ≥5 mm and an arc-shaped drainage slope on the outer surface.
6. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall as described in claim 1, characterized in that, The L-shaped metal cover plate (5) is made of aluminum alloy or stainless steel, with a plate thickness of t=1.5-3 mm, and is coated with anti-rust primer and exterior finish paint.
7. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall as described in claim 1, characterized in that, Waterproof membrane (9) is laid on the top surface of the inverted wall (2). The waterproof membrane (9) hangs down in the expansion joint and turns down ≥200mm on both sides of the inverted wall. The cross arm (5a) of the L-shaped metal cover plate (5) is fixed to the top of the inverted wall (2) by self-tapping screws (10). The head of the self-tapping screws (10) is covered with sealant (8).
8. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall according to claim 1, characterized in that, The polystyrene foam plastic template (11) is provided below the cast-in-place concrete expansion joint cover plate (1) and serves as an insulation layer. The edge of the cross arm (5a) of the L-shaped metal cover plate (5) overlaps on the top surface of the foam plastic template (11), and a water-stop strip (12) is added at the overlap.
9. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall according to claim 1, characterized in that, The outer side of the overlapping area of the metal expansion joint cover plate (3) and the L-shaped metal cover plate (5) of the exterior wall is covered by a decorative buckle cover (13). The decorative buckle cover (13) is snapped into the metal expansion joint cover plate (3) of the exterior wall, hiding the expansion bolts (6) and sealant (8) to form a flat exterior facade.
10. The anti-leakage device at the junction of the green roof and the expansion joint cover plate of the exterior wall according to any one of claims 1-9, characterized in that, All metal parts are pressed together in the direction of water flow. The top surface of the horizontal arm (5a) has a 2% outer slope, and the outer surface of the longitudinal arm (5b) has a vertical water-guiding groove (14) to facilitate rapid drainage and reduce the risk of water seepage.