Connection node structure of reinforced concrete gutter and composite steel plate roof cornice

Abstract

The utility model provides a connection node structure of a reinforced concrete gutter and a composite steel plate roof cornice, which comprises a reinforced concrete gutter, a steel plate roof cornice and a steel plate roof cornice, the end part of the bottom surface of the roof panel is erected above the outer wall of the reinforced concrete gutter, and the roof panel is provided with an inclined slope towards the gutter; the cornice sealing plate is a full-length L-shaped plate, the transverse section of the cornice sealing plate is fixedly connected to the roof panel, and the vertical section of the cornice sealing plate extends downwards along the roof panel and the side face of the outer wall of the reinforced concrete gutter; the gutter folding piece is a full-length bent plate, the lower horizontal section is fixedly connected to the top surface of the gutter outer wall, and the upper horizontal section is fixedly connected below the edge of the bottom surface of the roof panel; the upper horizontal section and the lower horizontal section are connected through a vertical section; and the cornice plug is arranged between the horizontal section of the cornice sealing plate and the roof panel. According to the utility model, the construction process is simplified and the waterproof performance and durability are improved while the connection strength is ensured, so that the requirements of modern constructional engineering are met.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, specifically relating to a connection node structure between reinforced concrete gutters and composite steel plate roof eaves. Background Technology

[0002] In existing building projects, the roof drainage system, especially the connection structure between reinforced concrete gutters and the eaves of composite steel roofs, has always been a weak link in waterproofing and durability. Traditional methods mainly include the following three approaches:

[0003] Welding connection - Although it can achieve high cross-sectional strength, high-temperature welding can cause local thermal deformation of composite steel plates and damage to the coating, which not only affects the appearance and anti-corrosion performance, but also puts high demands on the on-site construction technology and quality control.

[0004] Bolted connections are convenient to install, but bolts themselves are prone to loosening or corrosion during hot and cold cycles, and the sealing performance of the joints deteriorates over time. In addition, drilling holes in the roof panels to install bolts will inevitably weaken the strength of the panels and reduce the overall stability of the joints.

[0005] Adhesive fixing avoids drilling and high-temperature operations, but the bonding performance is greatly affected by environmental humidity and temperature. The adhesive layer is prone to aging and cracking, leading to detachment and leakage after long-term use.

[0006] The aforementioned methods, due to factors such as temperature stress, mechanical fatigue, or material aging, cannot simultaneously achieve ease of construction, waterproof reliability, and structural durability. Therefore, there is an urgent need for a novel connection node structure that requires no welding, no drilling, and does not rely on easily aging adhesives. This structure should utilize standardized bent sheets and simple fasteners to achieve continuous waterproof backing, pressure sealing, and end closure, thereby significantly improving the waterproof performance, construction efficiency, and service life of roof-gutter joints, meeting the high-performance requirements of modern architecture. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the above-mentioned background technology and provide a connection node structure between reinforced concrete gutters and composite steel plate roof eaves, which can simplify the construction process, improve waterproof performance and durability while ensuring connection strength, thereby meeting the needs of modern building engineering.

[0008] The technical solution adopted in this utility model is: a connection node structure between reinforced concrete gutters and composite steel plate roof eaves, comprising:

[0009] Reinforced concrete gutters have a horizontal trough at the bottom to collect and drain rainwater from the roof slabs;

[0010] The roof panel has its bottom end placed on top of the outer wall of the reinforced concrete gutter and has an inclined slope towards the gutter to direct rainwater directly into the reinforced concrete gutter.

[0011] The eaves cladding is a continuous L-shaped board. Its horizontal section is fixedly connected to the roof panel, and its vertical section extends downward along the outer side of the roof panel and the reinforced concrete gutter to form a water-blocking backing.

[0012] The gutter assembly is a continuous bent sheet material. The lower horizontal section is fixedly connected to the top surface of the outer wall of the gutter, and the upper horizontal section is fixedly connected to the lower edge of the bottom surface of the roof panel to support the roof panel. The upper and lower horizontal sections are connected by a vertical section.

[0013] An eaves end cap is placed between the horizontal section of the eaves end cap and the roof panel to seal the end and prevent rainwater or debris from seeping into the roof panel laterally.

[0014] In the above technical solution, thermal insulation cotton is laid between the vertical section of the eaves sealing plate and the outer wall of the gutter; the vertical section and the upper horizontal section of the gutter fold are attached to and covered by the thermal insulation cotton.

[0015] In the above technical solution, the roof panel is stacked from bottom to top as a roof base plate, a rock wool insulation layer, a waterproof and breathable layer, and an outer roof panel.

[0016] In the above technical solution, the horizontal section of the eaves sealing plate is fixedly connected to the top surface of the waterproof and breathable layer, and the vertical section extends downward to cover the waterproof and breathable layer, the rock wool insulation layer and the side of the roof bottom plate, until it fits against the inner side of the outer wall of the gutter.

[0017] In the above technical solution, the upper horizontal section of the gutter fitting is attached to the bottom surface of the roof slab.

[0018] In the above technical solution, a fixed bracket is set between the waterproof and breathable layer and the roof outer panel. The base plate of the fixed bracket is fixedly connected to the roof bottom plate, and its top is provided with a horizontal support surface for supporting the bottom surface of the roof outer panel.

[0019] In the above technical solution, the eaves end cap is placed between the bottom surface of the outer roof panel and the top surface of the eaves sealing plate.

[0020] In the above technical solution, the eaves panel is formed by bending a single piece of sheet material, and includes, in sequence:

[0021] The first horizontal section is fixedly connected to the bottom edge of the roof panel;

[0022] The vertical segment folds out at a right angle to the first horizontal segment and extends downwards;

[0023] The first inclined section bends out at an obtuse angle to the vertical section and slopes towards the inside of the reinforced concrete gutter.

[0024] The second inclined section bends out at an obtuse angle to the first inclined section, and its free end slopes inward toward the inside of the reinforced concrete gutter to prevent capillary seepage.

[0025] In the above technical solution, the eaves sealing plate is fixed to the inner surface of the outer wall of the reinforced concrete gutter by cement nails that are evenly spaced along the reinforced concrete gutter.

[0026] In the above technical solution, the gutter assembly is fixed to the top surface of the outer wall of the reinforced concrete gutter using expansion bolts.

[0027] The beneficial effects of this utility model are as follows: This utility model constructs a multi-layer protective structure consisting of "eaves sealing plate – gutter folding piece – roof panel – end cap piece". All components are bent plates and commonly used fasteners, avoiding welding on bent plates or roof panels, and eliminating the need to drill through holes in composite steel roof panels to install fasteners, thus reducing construction difficulty; the continuous "water blocking – pressure cover – water collection – sealing" functional layout and multiple overlaps eliminate the risk of leakage; it is applicable to various reinforced concrete gutters and can be used with different types of roof panel systems.

[0028] Furthermore, this utility model fills the space between the eaves sealing plate and the outer wall of the gutter with thermal insulation cotton, and forms an additional thermal resistance layer by pressing with folded parts, reducing the thermal bridging effect at the joint; the thermal insulation cotton has an adsorption and slow release effect on a small amount of seepage, forming a second barrier with the main waterproof layer.

[0029] Furthermore, the roof panel of this utility model has a clear division of labor in its layer sequence (bottom plate → rock wool insulation layer → waterproof and breathable layer → outer plate), with each layer independently undertaking the functions of structural load-bearing, heat preservation, breathability, and protection; the insulation materials and waterproofing system can be replaced according to local conditions to meet different environmental needs.

[0030] Furthermore, this utility model defines that the horizontal section of the eaves sealing plate is fixed to the top surface of the waterproof and breathable layer and extends along the side to the outer wall of the gutter, so that it is closely attached to the top surface of the waterproof and breathable layer to block the direct invasion of wind and rain; at the same time, it forms a continuous backing with the outer wall of the gutter to improve the reliability of water blocking.

[0031] Furthermore, this utility model limits the upper horizontal section of the gutter to be attached to the bottom surface of the roof slab, so that the upper horizontal section of the gutter directly supports the roof slab, thereby improving the overall stress performance of the joint.

[0032] Furthermore, this utility model sets a fixed support between the top surface of the waterproof and breathable layer and the bottom surface of the roof outer panel to form a ventilation layer: the support forms an air circulation channel to prevent condensation on the waterproof and breathable layer and the insulation layer; it also ensures the stability of the outer panel and improves the wind and earthquake resistance of the roof.

[0033] Furthermore, the eaves plug of this utility model is placed between the bottom surface of the outer panel and the top surface of the sealing panel: completely blocking lateral water seepage and debris intrusion.

[0034] Furthermore, the eaves sealing plate of this utility model is formed by bending a single piece of board, forming multiple bends in sequence: "horizontal - vertical - inclined - reverse fold". It is integrally formed without splicing seams, which can eliminate the risk of leakage at the joints; the reverse fold end of the second inclined section is specifically designed to block capillary upward seepage.

[0035] Furthermore, this utility model uses cement nails to evenly fix the eaves sealing plate, which is simple to construct, and the cement nails are economical, readily available, and quick to install; the evenly distributed point fixing method improves the sealing plate's resistance to wind pressure and pull-out.

[0036] Furthermore, this utility model uses expansion bolts to fix the gutter folding component to the top surface of the concrete outer wall: the expansion bolts provide strong pull-out resistance, ensuring that the folding component remains stable even under high wind load conditions; it is applicable to concrete structures of various strength grades, and has a wider range of applications. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of this utility model;

[0038] Figure 2 This is a partial schematic diagram of the present invention;

[0039] Figure 3 This is a schematic diagram of the eaves sealing plate of this utility model;

[0040] Figure 4 Here is a schematic diagram of the fixing bracket of this utility model;

[0041] Figure 5 Schematic diagram b of the fixed bracket of this utility model.

[0042] Among them, 1-reinforced concrete gutter, 11-flashing, 12-waterproof membrane, 13-sealant, 14-exterior wall cladding, 15-column edge line, 16-frame column, 2-roof panel, 21-roof base plate, 22-rock wool insulation layer, 23-waterproof and breathable layer, 24-outer roof panel, 25-fixed bracket, 251-plate base, 252-vertical column, 253-support plate; 26-secondary purlin, 27-support component, 28-steel beam, 3-eaves end cap, 31-first horizontal section, 32-vertical section, 33-first inclined section, 32-second inclined section, 4-gutter folding piece, 5-insulation cotton, 6-eaves end cap, 7-cement nail, 8-expansion bolt. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0044] like Figure 1As shown, this utility model provides a connection node structure between a reinforced concrete gutter and the eaves of a composite steel roof, comprising:

[0045] The reinforced concrete gutter 1 has a horizontal trough bottom for collecting and draining rainwater from the roof panel 2.

[0046] The roof panel 2 has its bottom end placed on the outer wall of the reinforced concrete gutter 1 and has an inclined slope towards the gutter so that rainwater can be directly directed into the reinforced concrete gutter 1.

[0047] The eaves panel 3 is a continuous L-shaped panel. Its horizontal section is fixedly connected to the roof panel 2, and its vertical section extends downward along the outer side of the roof panel 2 and the reinforced concrete gutter 1 to form a water-blocking backing.

[0048] The gutter folding component 4 is a continuous bent plate. The lower horizontal section is fixedly connected to the top surface of the outer wall of the gutter, and the upper horizontal section is fixedly connected to the lower edge of the bottom surface of the roof panel 2 to support the roof panel 2. The upper and lower horizontal sections are connected by a vertical section.

[0049] The eaves end cap 6 is installed between the horizontal section of the eaves end cap 3 and the roof panel 2, and is used to seal the end and prevent rainwater or debris from seeping into the roof panel 2 laterally.

[0050] In this embodiment, the reinforced concrete gutter 1 is installed along the inner side of the parapet wall and is integrated with the floor slab and structural frame, serving the function of collecting and draining rainwater from the roof. The reinforced concrete gutter 1 is made of reinforced concrete and meets the requirements of strength, durability and seepage prevention. The inner bottom is inclined at about 1% to 2% towards the drainage outlet to ensure that rainwater does not accumulate and flows quickly to the outlet. The height of the outer wall is consistent with the parapet wall, and the height of the inner wall is slightly lower than the top of the parapet wall to cooperate with the return water of the flashing 11. Waterproof membrane 12 is laid on the inner wall and bottom of the gutter along the entire width and is overlapped along the side wall to the lower edge of the vertical section of the eaves sealing plate 3. The waterproof membrane 12 and the eaves sealing plate 3 together form multiple overlapping covers to prevent rainwater from seeping through the gaps. The joint between the edge of the waterproof membrane 12 and the inner wall of the gutter is filled with sealant 13 to achieve airtightness and watertightness of the wall-gutter interface. The sealant 13 is also used to reinforce the joint between the purlin sealing plate and the gutter fold 4 and the flashing 11 to prevent capillary and wind pressure side seepage.

[0051] A flashing 11 is installed on the outer side of the top of the parapet wall, with its lower edge hooked back above the horizontal section of the eaves sealing plate 3 to guide rainwater from the parapet wall back to the gutter. The flashing 11, sealant 13, and exterior wall cladding panel 14 work together to form the first line of defense between the parapet wall and the eaves joint. The gutter body is strictly aligned with the frame column 16 and column edge line 15 on the plane to ensure that the eaves joint continues horizontally along the floor, facilitating the installation of the exterior wall cladding panel 14 as a whole. A steel frame inlay can be reserved at the bottom of the gutter to connect integrally with the concrete beam and slab, ensuring dimensional control during pouring and convenient reinforcement later.

[0052] Specifically, thermal insulation cotton 5 is laid between the vertical section of the eaves sealing plate 3 and the outer wall of the gutter; the vertical section and the upper horizontal section of the gutter fold 4 are attached to and covered by the thermal insulation cotton 5.

[0053] Preferably, based on the actual gap between the vertical section of the eaves sealing plate 3 and the outer wall of the gutter, select rock wool of appropriate density to make 5 strips of insulation cotton; cut the 5 strips of insulation cotton into long strips consistent with the length of the eaves, leaving a small amount of rough edge at the end for easy pressing. Apply neutral silicone sealant 13 to the junction of the vertical section of the folded piece and the vertical section of the eaves sealing plate 3, as well as at the edge of the insulation cotton 5, to fill all possible small gaps.

[0054] Specifically, the roof panel 2 is stacked from bottom to top with a roof base plate 21, a rock wool insulation layer 22, a waterproof and breathable layer 23, and an outer roof panel 24.

[0055] Preferably, the roof panels 2 are stacked from bottom to top in the following order:

[0056] The roof base plate 21 is made of color steel profiled sheet or fiber cement board with a thickness of 0.8 to 1.0 mm. It is fixed to the frame formed by the secondary purlin 26 (26) and the support member 27 (27) by self-tapping screws. Small gaps are left at the joints of the plates and treated with sealant or caulking strip to avoid cold bridges and water seepage.

[0057] Rock wool insulation layer 22: Rock wool boards are laid on the base plate. The recommended thickness is 50-100mm and the thermal conductivity is not greater than 0.045W / (m·K). The rock wool boards are laid in a staggered overlapping manner and lightly pressed and fixed with metal strips or plastic rivets to ensure that the board joints are tight and there are no obvious gaps.

[0058] Waterproof and breathable layer 23: A waterproof and breathable membrane (such as polymer self-adhesive roll or hot melt roll) is laid on top of the rock wool layer. It is required to have a microporous structure to block water droplet penetration while allowing water vapor to escape.

[0059] The outer roof panel 24 has a top layer of color steel tile or profiled steel sheet of the same material. The panel type can be single-layer or double-layer profiled. The outer panel is laid continuously outward from the direction of the parapet wall rain gutter along the roof slope (1% to 2%). The lower edge overlaps with the eaves sealing plate 3 and is locked to the top surface of the fixed bracket 25 by special clips or screws. The outer roof panels 24 are joined by tongue and groove or profiled splicing. The overlap height is not less than 20mm to ensure smooth drainage and prevent water accumulation.

[0060] Through the above-mentioned layering, a four-fold functional zone of "load-bearing, heat insulation, moisture dehumidification, and protection" is formed. The materials of each layer are compatible with and support each other, achieving efficient waterproofing, heat insulation, and structural stability at the joint between the roof panel 2 and the reinforced concrete gutter 1.

[0061] Preferably, the steel beam 28 serves as the main load-bearing component of the roof structure, spanning between the main frame columns 16 along the purlin spacing direction, transferring all upper loads to the main building structure. Support members 27 are fixed to the top of the steel beam 28, and can be of the socket or welded type, also serving a slope adjustment function. The roof base plate 21 is first laid horizontally and fixed to the top surface of the support member 27, providing structural support for the upper materials. Secondary purlins 26, with a Z-shaped cross-section, are fixed to the roof base plate 21, with the top surface of their upper flange flush with the top surface of the rock wool insulation layer 22, and the two are distributed side-by-side. Rock wool insulation boards are cut into strips and inserted between the two flanges of the Z-shaped cross-section of the secondary purlins 26, with their top surfaces at the same height as the purlin flanges. Thus, on the roof base plate 21, there is both the load-bearing support of the steel purlin frame and the continuous thermal insulation of the rock wool, forming a flat, uniformly high supporting surface. Waterproof and breathable membrane is laid on the surface of the secondary purlin 26 and the insulation layer, and can be covered by the purlin flange and the folded piece of the eaves sealing plate 3; finally, the roof panel 24 is laid, and its bottom surface is directly supported on the waterproof and breathable layer 23 and fixed to the secondary purlin 26 by fixing bracket 25 or other fasteners, so that the roof panel 24 is fixed to the roof base plate 21 by the secondary purlin 26.

[0062] The secondary purlins 26 are arranged at the same height as the insulation layer, eliminating the need for leveling the roof slab 21 at varying heights, allowing for rapid construction and easy slope control. The secondary purlins 26 provide structural strength and rigidity, while the rock wool insulation layer 22 provides thermal insulation. Together, they avoid thermal bridging and insulation blind spots, achieving support and insulation on the same plane, eliminating the need for separate leveling or secondary support between the slab and insulation layer. The waterproof and breathable layer 23 can be seamlessly covered on this plane and is secured by folded fittings at the eaves joints, ensuring the system's waterproofing and moisture-wicking functions. The load transmission path from the roof slab 24 → waterproof and breathable layer 23 → insulation layer + purlins → slab → support members 27 → main beam is clear, resulting in more even structural stress.

[0063] like Figure 2 As shown, specifically, the horizontal section of the eaves sealing plate 3 is fixedly connected to the top surface of the waterproof and breathable layer 23, and the vertical section extends downward to cover the waterproof and breathable layer 23, the rock wool insulation layer 22 and the side of the roof bottom plate 21, until it fits against the inner side of the outer wall of the gutter.

[0064] Preferably, the transverse section of the eaves panel 3 is in the shape of a horizontal plate, and its lower surface overlaps with the waterproof and breathable layer 23, extending outward to cover the top surface of the layer; the horizontal section prevents wind-blown rainwater from hitting the edge of the breathable layer and prevents rainwater from seeping into the lower layer; it provides mechanical support for the waterproof and breathable layer 23 and prevents the breathable membrane from bulging or partially detaching due to wind pressure.

[0065] The vertical section of the eaves sealing plate 3 bends at a right angle from the end of the horizontal section downwards, sequentially adhering to the sides of the waterproof and breathable layer 23, the rock wool insulation layer 22, and the roof bottom plate 21 along the cross-section of the building roof, and tightly adhering to the inner side of the outer wall of the reinforced concrete gutter 1 at the end; the vertical section sequentially covers the breathable layer → insulation layer → bottom plate, forming multiple physical barriers from the outside in; it is tightly adhered to the insulation layer, reducing heat loss along the structure at the eaves; it undergoes initial water dredging on the vertical surface, and together with the secondary water dredging of the eaves fittings, it guides rainwater back into the gutter cavity; it provides lateral support for the lower roll material and insulation layer, preventing interlayer slippage or compression deformation;

[0066] The horizontal and vertical sections of the eaves sealing plate 3 are combined to form an L-shaped waterproof backing, which is directly overlapped on the outermost side of the roof node; together with the gutter fold 4 and the eaves end cap 6, it ensures long-term waterproofing, heat preservation and structural stability at the eaves.

[0067] At the eaves, a local cavity or "transition" area is formed between the last secondary purlin 26 on the outer side and the vertical section of the eaves sealing plate 3. If the insulation cotton 5 is not filled, this area will become an obvious thermal bridge or air vent, which will not only affect the thermal insulation performance, but also easily generate condensation at the edge of the waterproof and breathable layer 23. Therefore, in this embodiment, an additional section of insulation cotton 5 is laid in the transition area, which can not only fill the gap between the insulation cotton 5 and the vertical section of the sealing plate to maintain the continuity of the insulation layer, but also block the thermal bridge at the joint and resist the wind pressure suction effect.

[0068] Specifically, the upper horizontal section of the gutter fold 4 is attached to the bottom surface of the roof base plate 21.

[0069] Preferably, the upper horizontal section of the gutter fold 4 is a flat plate, consistent with the bottom plane of the roof base plate 21; the width is designed to fully support the end of the roof base plate 21, and the edge of the upper horizontal section of the gutter fold 4 is located outside the roof base plate 21, ensuring that the edge of the plate is within the support range of the fold 4; the plate thickness is consistent with the lower horizontal section to maintain the overall rigidity of the fold 4 and avoid local sag; on the contact surface with the roof base plate 21, a small pressing protrusion can be reserved along the length direction to enhance the engagement with the base plate and provide assistance for subsequent sealing and anti-slip.

[0070] The upper horizontal section of the gutter fold 4 directly bears the self-weight and wind load of the roof base plate 21, forming a reliable integrated support of the plate and fold; it fits seamlessly with the bottom surface of the roof base plate 21, ensuring accurate positioning of the plate end in the horizontal and vertical directions, which facilitates the subsequent splicing of the outer plate.

[0071] Specifically, the eaves end cap 6 is located between the bottom surface of the roof outer panel 24 and the top surface of the eaves sealing plate 3.

[0072] Preferably, the eaves end cap 6 is formed by cutting a color-coated steel plate or aluminum alloy plate with a thickness of 0.8-1.2mm in one piece; it is rectangular in shape, and the length and width are customized according to the gap and overlap width between the eaves end cap 3 and the roof outer panel 24. Generally, the width is 20-30mm, and the height is the same as the width of the horizontal section of the eaves end cap 3; the eaves end cap 6 is tightly attached to the upper part of the horizontal section of the eaves end cap 3 and supports the bottom side of the roof outer panel 24 to form a tight seal, effectively preventing rainwater and debris from seeping in from the side of the end of the plate; since there are no complicated bends, it can be quickly disassembled by unscrewing 2-4 self-tapping screws to replace or repair the sealant 13; although there is no special back fold lip, the bottom of the plate is tightly pressed between the eaves end cap 3 and the overlap of the outer panel, and the sealant 13 forms a water seal, which is sufficient to prevent capillary water and wind-driven light rain from entering; the plate itself is relatively thin, and the fixing holes are relatively loose (the hole diameter is slightly larger than the screw diameter), which can slide slightly with the temperature change and is not easy to deform or bulge.

[0073] like Figure 3 As shown, specifically, the eaves panel 3 is formed by bending a single sheet of material, and includes, in sequence:

[0074] The first horizontal section 31 is fixedly connected to the bottom edge of the roof panel 2;

[0075] Vertical segment 32 folds out at a right angle to the first horizontal segment 31 and extends downward;

[0076] The first inclined segment 33 bends out at an obtuse angle to the vertical segment 32 and slopes towards the inside of the reinforced concrete gutter 1;

[0077] The second inclined section 32 is bent out at an obtuse angle to the first inclined section 33, and its free end is inclined towards the inside of the reinforced concrete gutter 1 to prevent capillary seepage.

[0078] Preferably, the first horizontal section 31 is parallel to the bottom edge of the roof panel 2, extends horizontally and covers the waterproof and breathable layer 23, and the eaves end cap 6 is set between the first horizontal section 31 and the outer roof panel 24; the eaves end cap 3 is firmly connected to the roof base layer, and at the same time provides the first water-proof barrier for the lower layer material.

[0079] The vertical section 32 is closely attached to the side of the insulation layer and the side of the roof bottom plate 21, completely sealing the space between the end of the plate and the outer wall of the inner gutter, blocking direct wind and rain.

[0080] The first inclined section 33 forms an obtuse angle with the vertical section and is inclined towards the inside of the reinforced concrete gutter 1. This section forms a covering effect between itself and the side of the rock wool insulation layer 22, which firmly clamps the rock wool insulation cotton 5 and the insulation cotton 5 to prevent them from falling off or being blown up by the wind. It can also provide a second channel for the diversion of a small amount of seepage.

[0081] The second inclined section 32 bends out at an obtuse angle from the end of the first inclined section 33, and is horizontal or slightly inclined inward; its free end bends back towards the inside of the gutter to form a capillary water-cutting lip, which can block the capillary back seepage of rainwater along the board seam, and at the same time serves as the outermost end seal of the eaves node.

[0082] The first horizontal section 31 blocks direct rain from the top, the vertical section seals the sides, the first inclined section 33 guides backflow of water, and the second inclined section 32 prevents capillary backflow. The first inclined section 33 covers the insulation cotton 5 or waterproof membrane 12, ensuring the integrity and continuity of the insulation and waterproof layers. Single-piece bending without seams eliminates the risk of leakage at the joints; each bent section is fixed with conventional fasteners, allowing for rapid on-site installation and facilitating maintenance and replacement.

[0083] Specifically, a fixed bracket 25 is provided between the waterproof and breathable layer 23 and the roof outer panel 24. The base plate of the fixed bracket 25 is fixedly connected to the roof bottom plate 21, and its top is provided with a horizontal support surface to support the bottom surface of the roof outer panel 24.

[0084] Preferably, such as Figure 4 and Figure 5 As shown, the fixing bracket 25 includes:

[0085] The plate base 251 is made of bent metal sheet and overlaps with the plane of the roof base plate 21. Several elongated or elliptical holes are opened on the base for adjustment and positioning. It is firmly fixed to the roof base plate 21 or secondary purlin 26 by self-tapping screws or rivets. The base is only lightly pressed against the waterproof and breathable layer 23 and the rock wool insulation layer 22 and does not rely on their load-bearing strength.

[0086] Vertical column 252, a vertical column (generally about 61mm high) protrudes from the center of plate base 251; the upper end of the column can be welded or bent into a flat plate to support the horizontal support surface; the support plate 253 is raised to below the bottom surface of the outer plate to ensure mechanical isolation between the outer plate and the waterproof and breathable layer 23.

[0087] Support plate 253 is designed in two ways to correspond to different types of roof panels 24:

[0088] Type I (e.g.) Figure 4 As shown): Support plate 253 has a larger width (e.g., 130mm) and is used for the overlap of two adjacent outer panels;

[0089] Type II (such as) Figure 5 As shown): The support plate 253 is narrower (e.g., 80mm) and its shape matches the corrugated profile of the roof panel 2;

[0090] The top surface of the support plate 253 is attached to the bottom surface of the roof outer panel 24 to bear the self-weight of the outer panel and wind load, forming a stable support and facilitating drainage.

[0091] The fixed bracket 25 concentrates the load of the roof panel 24 to the roof base layer (base plate, purlins, support members 27, and main beams), without relying on the insulation layer or waterproof layer; its base lightly presses on the waterproof and breathable layer 23 and is fixed only by the base plate, avoiding direct penetration or damage to the waterproof layer; no shear or tensile force is generated between the column and the support plate 253 and the waterproof and breathable layer 23, ensuring the ventilation and moisture removal function; Type I support plate 253 has a wide support surface, suitable for the overlapping area of ​​the roof panel 24; Type II support plate 253... The narrow protrusion, in conjunction with the corrugated roof panel 24, provides point support; the support plate 253 maintains a gap with the waterproof and breathable layer 23 (with the overlap of the outer panel), which facilitates rainwater to quickly slide into the gutter; the light pressure contact between the base and the waterproof and breathable layer 23 will not hinder the vapor diffusion of the breathable membrane; the fixed brackets 25 are all bent plates and standard fasteners, which can be quickly arranged on site and the position of the roof panel 24 can be locked; it has high compatibility and can flexibly select type I or type II brackets according to the panel type and waterproof layer form.

[0092] The fixed supports 25 are arranged in rows at the ribs or joints of the roof outer panel 24 in a "point" manner. They are generally evenly distributed according to the spacing of the purlins or joints at the eaves (e.g., 1.0m to 1.5m). Each fixed support 25 supports only one rib or flange of the roof outer panel 24, forming several point support points. The roof outer panel 24 itself will have a small tongue plate (downward flange) turned down at the edge of the eaves, the width of which matches the horizontal plane of the top plate (18mm) of the fixed support 25; it fits perfectly on the outside of the supporting surface of the fixed support 25.

[0093] Specifically, the eaves cap 3 is fixed to the inner surface of the outer wall of the reinforced concrete gutter 1 using cement nails 7 evenly spaced along the gutter 1. The gutter fold 4 is fixed to the top surface of the outer wall of the reinforced concrete gutter 1 using expansion bolts 8.

[0094] The construction process in this embodiment specifically includes the following steps:

[0095] Step 1: Pouring reinforced concrete gutter 1:

[0096] 1.1 Laying out lines: According to the design elevation and drainage direction, lay out the gutter axis on the inside of the exterior wall panel 14, and align it with the frame column 16 and column edge line 15 (keeping the plane aligned).

[0097] 1.2 Reinforcement binding and formwork: Construct the formwork for the side walls and bottom slab of the gutter, and reserve positions for the embedded connection parts with the beams and slabs;

[0098] 1.3 Concrete pouring: Pour the impermeable concrete, make a 1% to 2% slope at the bottom of the gutter towards the outlet, vibrate to compact, and cure until the strength meets the construction requirements;

[0099] 1.4 Cleaning: Remove the formwork, clean the inner walls and bottom of the trench, and check the slope and elevation.

[0100] Step 2: Roof support frame arrangement:

[0101] 2.1 Main beam installation: Confirm the position of steel beam 28 and complete welding or bolt assembly;

[0102] 2.2 Fixing of support member 27: Install support member 27 on the top surface of steel beam 28 and adjust the slope to 1% to 2%.

[0103] Step 3: Install the insulation cotton and folding parts at the eaves joints:

[0104] 3.1 Positioning of Gutter Folding 4: Place the lower horizontal section of the Z-shaped folding component on the top surface of the outer wall of the gutter, align it, and anchor it with expansion bolts 8;

[0105] 3.2 Insulation cotton 5 filling: Cut 5 strips of insulation cotton between the horizontal and vertical sections of the gutter fold 4, with the rough edges facing down. After stuffing, press lightly to fit and ensure there are no gaps.

[0106] 3.3 Cover fixing: The vertical section of the gutter fold 4 is attached and pressed tightly with the thermal insulation cotton 5 and the waterproof membrane 12.

[0107] Step 4: Laying the roof base layer and insulation layer:

[0108] 4.1 Roof base plate 21 installation: Lay profiled steel sheet or fiber cement board horizontally and fix it to the top surface of support member 27 with self-tapping screws. Leave a 5-10mm gap between the boards and temporarily seal the gap. The upper horizontal section of gutter fold 4 extends to below the bottom edge of roof base plate 21. Its top surface can be fixed to roof base plate 21 or the clip with self-tapping screws or special clips.

[0109] Fix the Z-shaped secondary purlins 26 to the roof base plate 21, so that the top surface of its upper flange is flush with the top surface of the subsequent insulation layer, and the spacing is evenly distributed according to the eaves board joint or purlin spacing (1.0m~1.5m);

[0110] 4.2 Rock wool insulation layer 22 insertion: Cut rock wool boards and fill them on the roof bottom plate 21 with staggered joints, and insert the insulation boards into the secondary purlins 26 so that the top surface of the insulation layer and the purlin flanges share the same plane.

[0111] Step 5, waterproof and breathable layer 23 and sealing treatment:

[0112] 5.1 Waterproof and breathable layer 23 roll material laying: Lay it on the top surface of rock wool insulation layer 22 and above the flange of the folded piece, overlapping the eaves sealing plate 3 and gutter folded piece 4 by 100mm each;

[0113] 5.2 Apply sealant 13: Apply neutral silicone sealant evenly to the junction of the eaves sealing board 3 and the gutter fold 4, the edge of the insulation cotton 5 and the joint of the roll material, and fill all gaps.

[0114] Step 6: Install the roof panel 24 and the fixing bracket 25:

[0115] 6.1 Arrangement of fixed brackets 25: They are evenly distributed in a dotted pattern between the waterproof and breathable layer 23 and the outer panel, with one bracket every 1.0m to 1.5m. They are anchored to the base plate or secondary purlin 26 by self-tapping screws that penetrate the waterproof layer and the rock wool insulation layer 22.

[0116] 6.2 Adjustment of bracket support plate 253: Select type I or type II support plate 253 and make its top surface flush with the bottom surface of the roof outer panel 24;

[0117] 6.3 Roofing exterior panel 24 installation: Starting from the rain gutter of the exterior wall panel 14, color steel tiles or profiled steel sheets are laid outward along the slope direction. The bottom edge is turned up and fitted under the support plate 253 of the bracket, and locked with clips or screws. The panels are spliced ​​by tongue and groove or profiled splicing, with an overlap height of ≥20mm.

[0118] Step 7: Finishing the eaves with panel 3 and end caps:

[0119] 7.1 Installation of eaves sealing plate 3: Fix the first horizontal section 31 of the L-shaped sealing plate to the top surface of the waterproof and breathable layer 23; fold the vertical section down at a right angle to fit the insulation layer, the side of the bottom plate and the outer wall of the gutter; cover the first inclined section 33 with insulation cotton 5, and fold the second inclined section 32 back into a capillary lip; use rivets or cement nails 7 to fix the first inclined section 33 to the inner side of the outside of the gutter.

[0120] 7.2 Eaves end cap 6 assembly: The rectangular plate is attached tightly to the upper part of the horizontal section of the tern-shaped end cap and supported on the bottom side of the outer plate. It can be fixed synchronously with the end cap with self-tapping screws, and sealant 13 is applied to the gap to complete the end sealing.

[0121] Step 8: Finishing the flashing 11 with the exterior wall:

[0122] 8.1 Installation of flashing 11: The outer side of the top of the exterior wall panel 14 is hooked back, and its lower edge is fastened to the upper part of the horizontal section of the eaves sealing plate 3;

[0123] 8.2 Exterior wall cladding panel 14 and sealant 13: After the surface layer is installed, apply sealant 13 to the interface between the flashing board 11 and the cladding panel to ensure integrated waterproofing of the wall and roof.

[0124] Step 9, Quality Inspection:

[0125] 9.1 Fastener inspection: Bolts, rivets, and screws are all tightened in place;

[0126] 9.2 Overlaps and Reverse Edges: The overlap lengths, reverse edge angles, and bending integrity of each overlap shall meet the design requirements;

[0127] 9.3 Water storage and leakage test: A 24-hour water storage test shall be conducted on the gutter joints. Acceptance is only possible if there is no leakage.

[0128] 9.4 Flatness and Slope Inspection: The flatness deviation of the two sides of the roof panel is ≤ ±3mm / m, and the slope deviation is ≤ ±0.5%.

[0129] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A connection node structure between a reinforced concrete gutter and the eaves of a composite steel roof, characterized in that: include: Reinforced concrete gutters have a horizontal trough at the bottom to collect and drain rainwater from the roof slabs; The roof panel has its bottom end placed on top of the outer wall of the reinforced concrete gutter and has an inclined slope towards the gutter to direct rainwater directly into the reinforced concrete gutter. The eaves cladding is a continuous L-shaped board. Its horizontal section is fixedly connected to the roof panel, and its vertical section extends downward along the outer side of the roof panel and the reinforced concrete gutter to form a water-blocking backing. The gutter assembly is a continuous bent sheet material. The lower horizontal section is fixedly connected to the top surface of the outer wall of the gutter, and the upper horizontal section is fixedly connected to the lower edge of the bottom surface of the roof panel to support the roof panel. The upper and lower horizontal sections are connected by a vertical section. An eaves end cap is placed between the horizontal section of the eaves end cap and the roof panel to seal the end and prevent rainwater or debris from seeping into the roof panel laterally.

2. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 1, characterized in that: Insulation cotton is laid between the vertical section of the eaves sealing board and the outer wall of the gutter; the vertical section and the upper horizontal section of the gutter fold are attached and covered with the insulation cotton.

3. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 1, characterized in that: The roof panels are stacked from bottom to top as follows: roof base plate, rock wool insulation layer, waterproof and breathable layer, and roof outer panel.

4. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 3, characterized in that: The horizontal section of the eaves sealing plate is fixedly connected to the top surface of the waterproof and breathable layer, and the vertical section extends downward to cover the waterproof and breathable layer, the rock wool insulation layer and the side of the roof bottom plate, until it fits against the inner side of the outer wall of the gutter.

5. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 3, characterized in that: The upper horizontal section of the gutter fitting is attached to the bottom surface of the roof slab.

6. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 3, characterized in that: A fixed bracket is provided between the waterproof and breathable layer and the outer roof panel. The base plate of the fixed bracket is fixedly connected to the roof base plate, and its top is provided with a horizontal support surface to support the bottom surface of the outer roof panel.

7. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 6, characterized in that: The eaves end cap is placed between the bottom surface of the outer roof panel and the top surface of the eaves sealing plate.

8. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 1, characterized in that: The eaves panel is formed by bending a single sheet of material, comprising, in sequence: The first horizontal section is fixedly connected to the bottom edge of the roof panel; The vertical segment folds out at a right angle to the first horizontal segment and extends downwards; The first inclined section bends out at an obtuse angle to the vertical section and slopes towards the inside of the reinforced concrete gutter. The second inclined section bends out at an obtuse angle to the first inclined section, and its free end slopes inward toward the inside of the reinforced concrete gutter to prevent capillary seepage.

9. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 1, characterized in that: The eaves cap is fixed to the inner surface of the outer wall of the reinforced concrete gutter by cement nails that are evenly spaced along the gutter.

10. The connection node structure between the reinforced concrete gutter and the eaves of the composite steel roof as described in claim 1, characterized in that: The gutter assembly is fixed to the top surface of the outer wall of the reinforced concrete gutter using expansion bolts.

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