A fire resistant wall structure for penetrating a metal roof

Abstract

This utility model belongs to the field of building fire protection technology, specifically disclosing a firewall structure that penetrates a metal roof. The lower firewall of the structure has a portal steel frame fixed to its top, and the surface of the portal steel frame is coated with a non-expanding fireproof coating. A support plate forms on the upper part of the portal steel frame, and the upper firewall is fixed to the support plate above the central axis of the portal steel frame. Purlins are fixed to both sides of the upper firewall on the support plate, and purlins are arranged between the upper firewalls and fixed to the purlins. Metal roof panels are arranged between the upper firewalls and their bottom ends are fixed to the purlins. The lower part of the flashing is fixed to the metal roof panel, and the upper part is fixed to the upper firewall. Outward-protruding water-retaining strips are fixed to both sides of the upper firewall. This utility model places the upper firewall on the support plate above the central axis of the portal steel frame, extending beyond the roof. Purlins are provided on both sides of the upper firewall on the support plate to connect the purlins, thus allowing for a continuous upper firewall. It features a simple structure, convenient construction, good fire resistance, and high economic efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of building fire protection technology, specifically relating to a fire wall structure that penetrates metal roofs, which is simple in structure, convenient to construct, has good fire resistance, and is economical and efficient. Background Technology

[0002] Firewalls are important partitioning components used to divide fire compartments inside and outside buildings, or to prevent the spread of fire between buildings. They effectively confine fire within a certain space during the initial stages of a fire and during firefighting, preventing the fire from spreading from one side of the firewall to the other, thus playing a crucial role in reducing fire damage. Firewalls should generally be directly supported on the building foundation and their position should remain as constant as possible from bottom to top within the building; especially for multi-story and high-rise buildings, firewalls should be directly installed on the main load-bearing beams and columns of each floor, and their position should remain as constant as possible from bottom to top.

[0003] When steel-structured roofs are used in industrial and civil buildings, the load-bearing structure and roof panels are mostly made of metal materials, which have a low fire resistance rating (generally only 0.2h). Therefore, according to the "Code for Fire Protection Design of Buildings," when the fire resistance rating of the roof load-bearing structure or roof panels in single-story or multi-story factories, warehouses, or civil buildings is less than 0.50h, or when both the roof load-bearing structure and roof panels have a fire resistance rating less than 0.50h, firewalls must be installed inside and outside such buildings, and these firewalls should extend at least 0.5m above the building roof to prevent fire from spreading from the roof to adjacent fire compartments.

[0004] Currently, for firewalls that penetrate metal roofs, autoclaved aerated concrete blocks are often used to form the firewalls, which are then removed from the metal roof panels. However, due to the dense purlins on the roof, and the fact that the firewalls need to avoid the purlins during construction, the construction process is quite complicated. Moreover, there are many areas that require fireproofing, which not only makes it difficult to guarantee the fire resistance of the firewalls but also easily leads to leaks at the connection between the firewalls and the metal roof.

[0005] In existing technologies, to address the shortcomings of firewalls penetrating metal roofs, ALC (autoclaved lightweight concrete) panels are used as firewall materials. These panels are installed from the interior floor level to the roof, with structural steel columns and beams on both sides. The ALC panels are then fixed to these columns or beams using angle steel and bolts. The portion of the ALC panel extending above the roof is covered with a metal sheet for protection and waterproofing. While ALC panels are prefabricated in a factory, facilitating on-site installation and improving construction efficiency, their application is currently limited due to their higher cost compared to traditional firewall materials (such as ordinary masonry blocks). Furthermore, ensuring a secure and reliable connection between the ALC panels and the structural steel columns and beams requires strict control over the material, specifications, and installation process of the connecting angle steel and bolts. Another approach involves installing a supporting steel structure on the firewall, with roof panels mounted above it. The firewall extends upwards from the roof panels, and metal flashing is installed at the top of the firewall. Fixing plates are installed on both sides of the firewall, fixed to the supporting steel structure. The roof panels and metal flashing are slidably connected to the fixing plates. While the roof panels and metal flashing can slide relative to the supporting steel structure during thermal expansion and contraction or under wind loads, and waterproofing can be ensured through proper structural design, achieving this sliding connection while maintaining structural stability and waterproofing requires sophisticated design of the supporting steel structure, fixing plates, and connection points between components. Furthermore, the use of specialized supporting steel structures, sliding connection components, and stringent installation precision increases costs. Utility Model Content

[0006] To address the problems existing in the background technology, this utility model provides a fire wall structure that is simple in structure, convenient in construction, has good fire resistance, and is economical and efficient for penetrating metal roofs.

[0007] The firewall structure of this utility model through a metal roof is implemented as follows: it includes a lower firewall and a portal steel frame. The lower firewall is vertically arranged, and the portal steel frame is vertically fixed to the top of the lower firewall. The surface of the portal steel frame is provided with a non-intumescent fireproof coating. It also includes purlins, an upper firewall, a metal roof panel, and flashing. The upper flange of the portal steel frame is widened to form a support plate. The upper firewall is vertically fixed to the support plate above the central axis of the portal steel frame. Vertical purlin supports are fixedly arranged on both sides of the upper firewall on the support plate. The purlins are arranged between adjacent upper firewalls and their two ends are fixedly connected to the corresponding purlin supports. The metal roof panel is arranged between adjacent upper firewalls and its bottom end is fixedly connected to the purlins.

[0008] The flashing is L-shaped and its lower part is fixedly abutted against the metal roof panel, while its upper part is tightly attached to and fixedly connected to the upper firewall. The upper firewall is also fixedly provided with outward-protruding water-blocking strips on both sides, and the upper part of the flashing extends to the bottom of the outward-protruding water-blocking strips.

[0009] Furthermore, the support plate is horizontally arranged and symmetrical to the axis of the portal frame, and the bottom end of the support plate is provided with several ribs at intervals along the extension direction of the portal frame on both sides of the portal frame.

[0010] Furthermore, the cross-section of the purlin bracket is T-shaped, L-shaped, or rectangular, and one side of the purlin is fixedly connected to the side wall of the purlin bracket.

[0011] Furthermore, a structural joint is provided between the purlin and the metal roof panel and the corresponding upper firewall, and the cantilevered surface of the outward-protruding water-blocking strip extends above the metal roof panel.

[0012] Furthermore, the lower part of the flashing, away from the upper firewall, is provided with a folded edge I that fits the corrugated surface of the metal roof panel. The lower part of the flashing is fixed to the metal roof panel with structural nails, and the upper part of the flashing is fixed to the upper firewall with expansion screws. A continuous sealing strip is provided at the connection between the flashing and the metal roof panel.

[0013] Furthermore, the upper firewall is provided with a continuous groove on both sides, and the upper part of the flashing is provided with a folded edge II at the end away from the metal roof panel and extends into the groove, and the groove is filled with sealant.

[0014] Furthermore, the outward-protruding water-blocking strip is L-shaped or Z-shaped. The outward-protruding water-blocking strip is attached to the outer side wall of the upper end of the flashing and is fixedly connected to the upper firewall by expansion screws passing through the flashing. The sealant extends outward and wraps around the expansion screws on the outward-protruding water-blocking strip.

[0015] Furthermore, the top and sides of the upper firewall are fixedly wrapped with a full-length outer cover plate, and the bottom ends of the outer cover plate extend into the sealant or to the outside of the sealant.

[0016] Furthermore, a waterproof layer and a heat insulation layer are provided between the metal roof panel and the purlin from top to bottom, and the heat insulation layer is made of glass wool, rock wool or aluminum silicate wool.

[0017] Furthermore, the upper firewall is at least 500mm higher than the top surface of the metal roof panel, and the fire resistance limit of the non-intumescent fireproof coating is not less than 3.0h.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model uses a portal steel frame fixed at the upper end of the lower firewall as the core support structure, replacing the independent structural steel columns and beams required by the traditional ALC panel scheme, as well as the complex support frame in the supporting steel structure scheme. Furthermore, the top of the portal steel frame is widened to form a support plate, making the portal steel frame and the support plate an integrated design, providing direct support for the upper firewall, thus effectively simplifying the structure. At the same time, the support plate fixes purlin brackets on both sides of the upper firewall, and directly fixes the purlins through the purlin brackets to support the metal roof panel, thereby completely disconnecting the purlins at the central axis of the portal steel frame with the upper firewall. Therefore, the upper firewall can be set continuously, which not only avoids the cumbersome steps of avoiding the purlins required by the traditional structure, but also reduces the number of parts that need to be fireproofed due to the firewall crossing the purlins and roof, improving construction efficiency and reliability.

[0020] 2. This utility model coats the surface of the portal steel frame with a non-expansive fireproof coating and directly fixes the continuous upper firewall to the support plate, forming a continuous and complete fire barrier. Moreover, the upper firewall extends all the way above the roof, so that the final metal roof structure meets the requirements of the "Code for Fire Protection Design of Buildings" and can effectively prevent the spread of fire along the roof. Furthermore, this utility model, through the integral steel frame support and continuous fireproof coating, can reduce the complex sealing nodes at the junction of the firewall and the roof in traditional structures, reducing the weak points in fire protection.

[0021] 3. This utility model features an "L"-shaped flashing at the structural joint between the metal roof panel and the upper firewall. The lower end of the flashing has a folded edge I that conforms to the corrugations of the metal roof panel, and the upper end has a folded edge II that inserts into a continuous groove in the upper firewall, forming a physical barrier. Furthermore, sealant is filled into the groove to wrap around folded edge II, forming the first seal. A continuous sealing strip is also installed at the connection between the flashing and the metal roof panel, forming the second seal. Additionally, cantilevered water-blocking strips are installed on both sides of the firewall to guide rainwater away from the joint between the firewall and the flashing. Through these multiple waterproofing designs, the problem of easy leakage at structural joints is effectively solved.

[0022] 4. The purlin brackets, purlin strips, metal roof panels, and other components of this utility model can be prefabricated and quickly installed on-site using screws and structural nails. Moreover, compared to the strict requirements on the material specifications and installation process of angle steel and bolts in the ALC panel solution, the connection methods between purlin strips and purlin brackets, and between flashing and metal roof panels / firewalls, are more conventional and universal. Therefore, this solution can reduce the amount of on-site welding or masonry work to improve construction efficiency and reduce material costs.

[0023] 5. By setting a structural joint between the purlin and the upper firewall, this utility model allows the metal roof panel to shift due to thermal expansion and contraction or wind load, avoiding cracking caused by stress concentration and significantly improving the stability and durability of the structure.

[0024] In summary, this utility model, through its core design of "portal steel frame support + flashing waterproofing + standardized assembly," has achieved technological breakthroughs in structural simplification, fire and water resistance, and cost control. It effectively solves the problems of cumbersome construction, high leakage risk, and high cost of existing firewalls penetrating metal roofs, and has significant engineering application value. Attached Figure Description

[0025] Figure 1 This is a plan view of the present invention;

[0026] Figure 2 for Figure 1 Sectional view along line AA;

[0027] Figure 3 for Figure 2 Enlarged view of point B in the image;

[0028] Figure 4 for Figure 1 C-axis sectional view;

[0029] In the diagram: 1-Lower firewall, 2-Portal steel frame, 3-Rib plate, 4-Support plate, 5-Purlin bracket, 6-Purlin strip, 7-Upper firewall, 8-Metal roof panel, 9-Flashing, 10-Cantilevered water-blocking strip, 11-Structural joint, 12-Sealing strip, 13-Groove, 14-Sealing adhesive, 15-Outer cladding, 16-Expansion bolt, 17-Waterproof layer, 18-Insulation layer. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0031] like Figure 1 , 2 As shown in Figures 3 and 4, the firewall structure of this utility model that penetrates a metal roof includes a lower firewall 1 and a portal steel frame 2. The lower firewall 1 is vertically arranged, and the portal steel frame 2 is vertically fixed to the top of the lower firewall 1. The surface of the portal steel frame 2 is provided with a non-expansive fireproof coating. It also includes purlins 6, an upper firewall 7, a metal roof panel 8, and flashing 9. The upper flange of the portal steel frame 2 is widened to form a support plate 4. The upper firewall 7 is vertically fixed on the support plate 4 above the central axis of the portal steel frame 2. Vertical purlin supports 5 are fixedly arranged on both sides of the upper firewall 7 on the support plate 4. The purlins 6 are arranged between adjacent upper firewalls 7 and their two ends are fixedly connected to the corresponding purlin supports 5. The metal roof panel 8 is arranged between adjacent upper firewalls 7 and its bottom end is fixedly connected to the purlins 6.

[0032] The flashing 9 is L-shaped and its lower part is fixedly abutted against the metal roof panel 8, and its upper part is tightly attached to and fixedly connected to the upper firewall 7. The upper firewall 7 is also fixedly provided with outward-protruding water-blocking strips 10 on both sides, and the upper part of the flashing 9 extends to the bottom of the outward-protruding water-blocking strips 10.

[0033] The support plate 4 is horizontally arranged and symmetrical to the axis of the portal steel frame 2. The bottom end of the support plate 4 is provided with several ribs 3 at intervals along the extension direction of the portal steel frame 2 on both sides of the portal steel frame 2.

[0034] The cross-section of the purlin bracket 5 is T-shaped, L-shaped, or rectangular, and one side of the purlin 6 is fixedly connected to the side wall of the purlin bracket 5.

[0035] A structural joint 11 is provided between the purlin 6 and the metal roof panel 8 and the corresponding upper firewall 7, and the cantilevered water-blocking strip 10 extends outward to the top of the metal roof panel 8.

[0036] The lower part of the flashing 9, away from the upper firewall 7, is provided with a folded edge I that fits the corrugated surface of the metal roof panel 8. The lower part of the flashing 9 is fixed to the metal roof panel 8 by structural nails, and the upper part of the flashing 9 is fixed to the upper firewall 7 by expansion screws 16. A continuous sealing strip 12 is provided at the connection between the flashing 9 and the metal roof panel 8.

[0037] The upper firewall 7 has a continuous groove 13 on both sides. The upper part of the flashing 9, away from the metal roof panel 8, has a folded edge II that extends into the groove 13. The groove 13 is filled with sealant 14.

[0038] The outward-protruding water-blocking strip 10 is L-shaped or Z-shaped. The outward-protruding water-blocking strip 10 is attached to the outer side wall of the upper end of the flashing plate 9 and is fixedly connected to the upper firewall 7 by expansion screws 16 passing through the flashing plate 9. The sealant 14 extends outward and wraps around the expansion screws 16 on the outward-protruding water-blocking strip 10.

[0039] The top and sides of the upper firewall 7 are fixedly wrapped with a full-length outer cover plate 15, and the bottom ends of the outer cover plate 15 extend into the sealant 14 or to the outside of the sealant 14.

[0040] A waterproof layer 17 and a heat insulation layer 18 are provided between the metal roof panel 8 and the purlin 6 from top to bottom. The heat insulation layer 18 is made of glass wool, rock wool or aluminum silicate wool.

[0041] The upper firewall 7 is at least 500mm higher than the top surface of the metal roof panel 8, and the fire resistance limit of the non-intumescent fireproof coating is not less than 3.0h.

[0042] Construction process of this utility model:

[0043] like Figure 1 , 2 As shown in Figures 3 and 4, before construction, the portal steel frame 2 containing ribs 3, support plates 4 and purlin brackets 5 is prefabricated in the factory according to the design. At the same time, purlins 6, metal roof panels 8, flashing 9, cantilevered water-blocking strips 10, sealing strips 12 and outer cladding panels 15 are also prefabricated. Then, the aforementioned components are transported to the construction site. During construction, according to the design, the aforementioned portal steel frame 2 is vertically fixed at intervals to the top of the lower firewall 1. Then, the upper firewall 7 is built to the predetermined height on the support plate 4 above the central axis of the portal steel frame 2, and a continuous groove 13 is opened on both sides of the upper firewall 7 (if necessary, a continuous outer cladding plate 15 is fixedly wrapped around the top and sides of the upper firewall 7). Next, several purlins 6 are set at intervals on both sides of the upper firewall 7, and their ends are riveted or bolted to the corresponding purlin brackets 5. Then, metal roof panels 8 are fixedly installed on the purlins 6 between adjacent upper firewalls 7 (if necessary, a waterproof layer 17 and a partition are installed from top to bottom between the metal roof panel 8 and the purlins 6). (18) After completion, the lower part of the flashing 9 is fixed to the metal roof panel 8 with structural nails and the upper part is fixed to the upper firewall 7 with expansion screws 16. The folded edge II of the upper part of the flashing 9 away from the metal roof panel 8 extends into the groove 13, and a continuous sealing strip 12 is set at the connection between the lower part and the metal roof panel 8. Then, the cantilevered water-blocking strip 10 is attached to the outer wall of the upper end of the flashing 9 and fixedly connected to the upper firewall 7 with the expansion screws 16 passing through the flashing 9. Next, the groove 13 is filled with sealant 14, and the sealant 14 extends downward and wraps around the expansion screws 16 on the cantilevered water-blocking strip 10, thus completing the construction of the firewall structure through the metal roof.

[0044] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A firewall structure penetrating a metal roof, comprising a lower firewall (1) and a portal steel frame (2), wherein the lower firewall (1) is vertically arranged, and the portal steel frame (2) is vertically fixed to the top of the lower firewall (1), and the surface of the portal steel frame (2) is provided with a non-intumescent fireproof coating; characterized in that: It also includes purlins (6), upper firewalls (7), metal roof panels (8), and flashing (9). The upper flange of the portal frame (2) is widened to form a support plate (4). The upper firewall (7) is vertically fixed on the support plate (4) above the central axis of the portal frame (2). The support plate (4) has vertical purlin brackets (5) fixed on both sides of the upper firewall (7). The purlins (6) are arranged between adjacent upper firewalls (7) and their two ends are fixedly connected to the corresponding purlin brackets (5). The metal roof panels (8) are arranged between adjacent upper firewalls (7) and their bottom ends are fixedly connected to the purlins (6). The flashing (9) is L-shaped and its lower part is fixedly abutted against the metal roof panel (8), and its upper part is tightly attached to the upper firewall (7) and fixedly connected. The upper firewall (7) is also fixedly provided with outward-protruding water-blocking strips (10) on both sides. The upper part of the flashing (9) extends to the bottom of the outward-protruding water-blocking strips (10).

2. The wall structure of claim 1, wherein: The support plate (4) is horizontally arranged and symmetrical to the axis of the portal steel frame (2). The bottom end of the support plate (4) is provided with several ribs (3) at intervals along the extension direction of the portal steel frame (2) on both sides of the portal steel frame (2).

3. The wall structure of claim 1, wherein: The cross-section of the purlin bracket (5) is "T", "L" or rectangular, and one side of the purlin (6) is fixedly connected to the side wall of the purlin bracket (5).

4. A wall construction according to claim 1, 2 or 3, wherein: A structural joint (11) is provided between the purlin (6) and the metal roof panel (8) and the corresponding upper firewall (7), and the cantilevered water-blocking strip (10) extends outward to the top of the metal roof panel (8).

5. The metal roof covering firewall structure according to claim 4, wherein: The flashing (9) has a folded edge I at the lower end away from the upper firewall (7) that fits the corrugated surface of the metal roof panel (8). The lower part of the flashing (9) is fixed to the metal roof panel (8) by structural nails, and the upper part of the flashing (9) is fixed to the upper firewall (7) by expansion screws (16). A continuous sealing strip (12) is provided at the connection between the flashing (9) and the metal roof panel (8).

6. The firewall structure penetrating a metal roof according to claim 5, characterized in that: The upper firewall (7) has a continuous groove (13) on both sides. The upper part of the flashing (9) away from the metal roof panel (8) has a folded edge II that extends into the groove (13). The groove (13) is filled with sealant (14).

7. The wall structure of claim 6, wherein: The outward-protruding water-blocking strip (10) is L-shaped or Z-shaped. The outward-protruding water-blocking strip (10) is attached to the outer side wall of the upper end of the flashing plate (9) and is fixedly connected to the upper firewall (7) by expansion screws (16) passing through the flashing plate (9). The sealant (14) extends outward and wraps around the expansion screws (16) on the outward-protruding water-blocking strip (10).

8. The wall structure of claim 6, wherein: The top and sides of the upper firewall (7) are fixedly wrapped with a full-length outer cover plate (15), and the bottom ends of the outer cover plate (15) extend into the sealant (14) or to the outside of the sealant (14).

9. The wall structure of claim 4, wherein: A waterproof layer (17) and a heat insulation layer (18) are provided between the metal roof panel (8) and the purlin (6) from top to bottom. The heat insulation layer (18) is made of glass wool, rock wool or aluminum silicate wool.

10. The fire resistant wall structure of claim 4, wherein: The upper firewall (7) is at least 500 mm higher than the top surface of the metal roof panel (8), and the fire resistance limit of the non-intumescent fireproof coating is not less than 3.0 h.

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