An assembled double-slope steel structure roof

Abstract

The present invention discloses a prefabricated double-slope steel structure roof, which relates to the field of prefabricated building roofs and includes a ridge part and roof plates connected to both sides of the ridge part. The ridge part includes a ridge body and an extension member fixedly connected to the bottom of the ridge body. A plurality of installation grooves are formed on both sides of the extension member, and a plurality of installation parts for inserting into the installation grooves are arranged at one end of the roof plate facing the ridge part. The installation parts correspond to the installation grooves one by one, and the installation parts are rotatably connected in the installation grooves; a locking mechanism for fixing the roof plate and the extension member is also included. The present invention provides a prefabricated double-slope steel structure roof to solve the problem that the slope angle of the double-slope roof is relatively fixed in the prior art, and to achieve the purpose of changing the slope angle of the double-slope roof and improving the adaptability and versatility of the double-slope roof in steel structure buildings.

Description

Technical Field

[0001] The invention relates to the field of assembled building roofs, and in particular to an assembled double-slope steel structure roof. Background Art

[0002] Prefabricated steel structure buildings are a type of construction method that uses prefabricated steel components produced in factories and then assembled and connected on site. They have the characteristics of standardized design, factory production, assembly construction, information management and integrated decoration. They are widely used in modern buildings due to their advantages such as high efficiency, environmental protection and earthquake resistance.

[0003] Double-slope roof is a common roof form in prefabricated steel structure buildings. It consists of two inclined roof panels, which usually intersect at the top to form a ridge. Double-slope roof has the advantages of simple structure, convenient construction, good waterproof performance, thermal insulation, strong durability, easy maintenance, beautiful and diverse, and economical in prefabricated steel structure buildings.

[0004] In the prior art, the inclination angle of the top plate of the double-slope roof is fixed and cannot be adjusted, and cannot meet the installation requirements of different slope angles; for roofs with different slope angles, different molds are required to prepare different top plates and corresponding ridges, which is undoubtedly not conducive to large-scale and intensive production, and also leads to a low degree of modularization of the double-slope roof. Summary of the invention

[0005] The present invention provides an assembled double-slope steel structure roof to solve the problem that the slope angle of the double-slope roof in the prior art is relatively fixed, achieve the purpose of changing the slope angle of the double-slope roof, and improve the adaptability and versatility of the double-slope roof in steel structure buildings.

[0006] The present invention is achieved through the following technical solutions:

[0007] An assembled double-slope steel structure roof comprises a ridge portion and a top plate connected to both sides of the ridge portion, the ridge portion comprises a ridge body and an extension piece fixedly connected to the bottom of the ridge body, a plurality of mounting grooves are provided on both sides of the extension piece, a plurality of mounting portions for inserting into the mounting grooves are provided at one end of the top plate facing the ridge portion, the mounting portions correspond to the mounting grooves one by one, and the mounting portions are rotatably connected in the mounting grooves; and a locking mechanism for fixing the top plate and the extension piece is also included.

[0008] In view of the problem of the fixed slope angle of the double-slope roof in the prior art, the present invention proposes an assembled double-slope steel structure roof, which includes top plates on both sides. The top plates on both sides are distributed in a "V" shape, and are connected by a ridge part between the two top plates. In this application, the ridge part includes a ridge body, and an extension piece is arranged at the bottom of the ridge body, and the installation of the two top plates is realized through the extension piece. Specifically, a plurality of installation grooves are arranged on both opposite sides of the extension piece, and installation parts corresponding to the installation grooves one by one are arranged at the corresponding ends of the top plate. When the installation parts enter the corresponding installation grooves and are rotationally connected, the inclination angle of the top plate can be adjusted, and then the slope angle of the roof can be adjusted. After the adjustment is in place, the top plate is locked by a locking mechanism so that the top plate is fixed relative to the extension piece. In this solution, the rotational connection method of the installation plate in the installation groove can adopt any rotational matching method in the prior art, such as using a rotating shaft, a hinge, etc.; in addition, the locking mechanism can adopt any mechanism that can temporarily fix the top plate on the extension piece, such as a clamp or an electric motor brake, etc.

[0009] It can be seen that this application can adjust the angles of the two top plates on the premise of keeping the ridge part stationary, and then adjust the inclination angle of the roof slope. Through a set of structures, the installation requirements of different slope angles can be met, and it is suitable for roofs with different slope angles, which is beneficial to improving the adaptability and versatility of the double-slope roof in steel structure buildings, and is also beneficial to the large-scale and intensive production of steel structure roofs.

[0010] Further, the bottom end of the installation groove is open; a plurality of installation grooves on the same side of the extension piece are equally spaced.

[0011] In this solution, the installation groove is not only open on the side, but also open at its bottom end to avoid the interference of the groove bottom on the rotation of the top plate, and to increase the angle adjustment range of the top plate to a greater extent. A plurality of installation grooves on the same side are equally spaced, so that the corresponding installation parts are also equally spaced, thereby improving the force uniformity and connection stability.

[0012] Further, a first through hole penetrating all the installation grooves on the same side is opened on the extension piece, and a second through hole matching the first through hole is opened on the installation part; further includes a rotating shaft passing through all the first through holes and second through holes on the same side; the rotating shaft is fixedly connected to the installation part, and the locking mechanism is used to fix the angle of the rotating shaft.

[0013] When this solution is in use, the local part of the installation part is inserted into the corresponding installation groove, so that each first through hole is aligned with the second through hole, and then the rotating shaft is inserted, and the connection between the top plate and the extension part can be realized. Of course, in order to ensure the smooth rotation of the installation part, the size of the installation part should be smaller than that of the installation groove. Since the rotating shaft is fixedly connected to the installation part, when the rotating shaft rotates to a set angle, the rotating shaft is locked by the locking mechanism, and the locking of the top plate can be realized. The rotation connection method of this solution can reduce the connection gap between the top plate and the extension part, and thus reduce the air leakage degree of the double-slope roof.

[0014] Furthermore, a first threaded hole penetrating through the second through hole is formed on the installation part, and a plurality of second threaded holes matching the first threaded hole are formed on the rotating shaft; between the rotating shaft and the installation part, they are fixedly connected by a first bolt penetrating through the first threaded hole and the second threaded hole.

[0015] After the rotating shaft is inserted into the second through hole, adjust the relative angle between the two to make the first threaded hole align with the second threaded hole, and then screw in the first bolt, and the fixed connection between the rotating shaft and the installation part can be realized. This connection method can realize the stable connection of the top plate through multiple installation parts, is convenient for quick installation, and is also beneficial for disassembly and later maintenance and replacement.

[0016] Furthermore, the installation part is square, the axis of the first threaded hole is perpendicular to the axis of the second through hole, and the axis of the first threaded hole is parallel to the thickness direction of the top plate; the aperture of the first threaded hole is smaller than the aperture of the second through hole. The layout method of this solution is more conducive to the rapid assembly of the roof structure and is beneficial to reducing the installation difficulty.

[0017] Furthermore, the locking mechanism includes a locking ring fixedly connected to the end of the extension part, the locking ring is coaxial with the first through hole, and the inner diameter of the locking ring is equal to the outer diameter of the rotating shaft; the end of the rotating shaft is detachably connected to the locking ring.

[0018] Considering that if the rotating shaft is locked in the installation groove, it is easy to occupy a large space and is not conducive to disassembly operations, so this solution specifically designs a locking mechanism. Specifically, the locking mechanism includes a locking ring, which is fixed on the end face of the extension part and sleeved outside the first through hole. After the end of the rotating shaft passes through the first through hole, it is exactly located inside the locking ring. Connecting the end of the rotating shaft to the locking ring can realize the fixed connection between the rotating shaft and the extension part, and thus realize the relative fixation between the top plate and the extension part. This solution sets the locking mechanism at the end of the extension part, avoiding the locking mechanism occupying the space inside the installation groove, and is also beneficial for quickly operating the locking mechanism externally.

[0019] Further, third threaded holes are formed at both ends of the rotating shaft, and the axis of the third threaded holes is perpendicular to the axis of the rotating shaft; a plurality of circumferentially distributed flat portions are provided on the outer wall of the locking ring, the flat portions are opposite to each other in pairs along the radial direction, and fourth threaded holes matching the third threaded holes are formed in the flat portions; between the end of the rotating shaft and the locking ring, they are connected by a second bolt passing through the third threaded holes and the fourth threaded holes.

[0020] This solution provides several gears for the rotating shaft, and the connection line of a pair of flat portions opposite to each other is used as one gear; in specific use, rotate the rotating shaft so that both ends of the third threaded hole at its end face a certain two opposite fourth threaded holes, and then screw in the second bolt to quickly realize the detachable connection between the rotating shaft and the locking ring. This solution can improve the stability of the roof connection while enabling the roof of the prefabricated building to have the adjustment ability, and at the same time is convenient for quick installation and disassembly.

[0021] Further, a hollow channel with both ends open is provided on the extension member, and the axis of the hollow channel is parallel to the length direction of the ridge body. Most of the double-slope roofs of traditional steel structure buildings are of closed structures, and the incoming wind on both sides can be diverted through the top plate, but it is difficult to divert the incoming wind from the front and the back. In this solution, the extension member is set as a hollow structure, a hollow channel is provided therein, and both ends of the hollow channel are open, so that the incoming wind from the front and the back can flow through the hollow channel, which is beneficial to reducing wind resistance; more importantly, the setting of the hollow channel can reduce the weight and material consumption of the extension member, and thus reduce the cost and self-weight of the steel structure roof.

[0022] Further, a limiting member fixedly connected to the bottom of the extension member is further included, the limiting member is located in the inner direction of the installation groove, and one side of the limiting member facing the corresponding installation groove is open; a first baffle slidably fitted in the limiting member is further included, and a second baffle is detachably connected to the end of the first baffle away from the limiting member, and the second baffle extends upward from the top surface of the first baffle.

[0023] In this application, due to the existence of the installation groove, the air flow diverted from the top of the top plate may enter the installation groove and flow downward through the installation groove into the building interior. Although there may be structures such as floor slabs below the steel structure roof to block the air flow from entering the room, there is still a risk of affecting the airtightness of the room. Moreover, since the angle of the top plate in this application is adjustable, it is impossible to seal the installation groove. Therefore, in this solution, a limiting member is provided at the bottom of the extension member, and the first baffle can slide horizontally through the limiting member. After the angle of the top plate is adjusted in place, the first baffle is slid to the vicinity of the side open area close to the installation groove, and a sealing material is filled into the gap between the top of the first baffle and the groove wall of the installation groove, thereby reducing the risk of air flow entering the room through the installation groove. The existence of the second baffle can block the aforementioned filled sealing material and prevent it from falling off easily. Since the angle of the top plate is uncertain, in this solution, the second baffle is detachably connected to the end of the first baffle, and different-height second baffles can be flexibly replaced according to needs. The sliding connection of the first baffle and the detachable connection of the second baffle in this solution are both to avoid interfering with the adjustment of the angle of the top plate.

[0024] Further, a plurality of hooks are provided on the top surface of the top plate; a pull rope is further included, one end of the pull rope is fixed to the side wall of the extension member, and the other end is connected to the hook.

[0025] After the roof installation of this application is completed, the pull rope can be hooked to the corresponding hook to further improve the installation stability of the roof of this application. Preferably, the pull rope can be realized by using an elastic rope and a structure equipped with a wire winder.

[0026] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0027] 1. The prefabricated double-slope steel structure roof of the present invention can adjust the angles of the two side top plates on the premise of keeping the ridge part stationary, and then adjust the inclination angle of the roof slope. Through a set of structures, the installation requirements of different slope angles can be met, and it is suitable for roofs with different slope angles, which is beneficial to improving the adaptability and versatility of the double-slope roof in steel structure buildings, and is also beneficial to the large-scale and intensive production of steel structure roofs.

[0028] 2. The prefabricated double-slope steel structure roof of the present invention designs a special rotation connection method of the installation plate in the installation groove, which can reduce the connection gap between the top plate and the extension member, and then reduce the air leakage risk of the double-slope roof.

[0029] 3. The prefabricated double-slope steel structure roof of the present invention can reduce the risk of air flow entering the room through the installation groove.

[0030] 4. The prefabricated double-slope steel structure roof of the present invention is beneficial to realizing the rapid assembly of prefabricated buildings, reducing the installation difficulty, and is also beneficial to disassembly and later maintenance and replacement. Brief Description of the Drawings

[0031] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0032] Figure 1 is a cross-sectional view of Embodiment 1 in a specific embodiment of the present invention;

[0033] Figure 2 is a schematic structural view of the ridge part in a specific embodiment of the present invention;

[0034] Figure 3 is a partial schematic view of the top plate in a specific embodiment of the present invention;

[0035] Figure 4 is a schematic structural view of the rotating shaft in a specific embodiment of the present invention;

[0036] Figure 5 is a schematic structural view of the locking ring in a specific embodiment of the present invention;

[0037] Figure 6 is a cross-sectional view of Embodiment 2 in a specific embodiment of the present invention;

[0038] Figure 7 is Figure 6 a partial enlarged view of part A in

[0039] Reference numerals in the drawings and corresponding component names:

[0040] 1 - top plate, 2 - ridge body, 3 - extension piece, 4 - installation groove, 5 - installation part, 6 - first through hole, 7 - second through hole, 8 - rotating shaft, 9 - first threaded hole, 10 - second threaded hole, 11 - first bolt, 12 - locking ring, 13 - third threaded hole, 14 - flat part, 15 - fourth threaded hole, 16 - second bolt, 17 - hollow channel, 18 - limiting part, 19 - first baffle, 20 - second baffle, 21 - hook, 22 - pulling rope, 23 - third bolt, 24 - plugging object. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention. In the description of the present application, it should be understood that the orientation or positional relationships indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of protection of the present application.

[0042] Embodiment 1

[0043] As Figures 1 to 4 shown, an assembled double-slope steel structure roof includes a ridge portion and roof plates 1 connected to both sides of the ridge portion. The ridge portion includes a ridge body 2 and an extension member 3 fixedly connected to the bottom of the ridge body 2. A plurality of installation grooves 4 are provided on both sides of the extension member 3. One end of the roof plate 1 facing the ridge portion is provided with a plurality of installation portions 5 for inserting into the installation grooves 4. The installation portions 5 correspond to the installation grooves 4 one by one, and the installation portions 5 are rotatably connected within the installation grooves 4. It also includes a locking mechanism for fixing the roof plate 1 and the extension member 3.

[0044] In this embodiment, the bottom end of the installation groove 4 is open; a plurality of installation grooves 4 on the same side of the extension member 3 are equally spaced.

[0045] In addition, as Figure 2 shown, a first through hole 6 penetrating all the installation grooves 4 on the same side is provided on the extension member 3, and a second through hole 7 matching the first through hole 6 is provided on the installation portion 5; it also includes a rotating shaft 8 passing through all the first through holes 6 and second through holes 7 on the same side; the rotating shaft 8 is fixedly connected to the installation portion 5, and the locking mechanism is used to fix the angle of the rotating shaft 8. It should be noted that Figure 2 in order to facilitate the display, only the rotating shaft 8 on the left side and the first through hole 6 on the right side without inserting the corresponding rotating shaft 8 are shown.

[0046] In this embodiment, a first threaded hole 9 penetrating the second through hole 7 is provided on the installation portion 5, and a plurality of second threaded holes 10 matching the first threaded hole 9 are provided on the rotating shaft 8; between the rotating shaft 8 and the installation portion 5, they are fixedly connected by a first bolt 11 passing through the first threaded hole 9 and the second threaded hole 10.

[0047] The installation portion 5 is square, and its corners can be rounded. The axis of the first threaded hole 9 is perpendicular to the axis of the second through hole 7, and the axis of the first threaded hole 9 is parallel to the thickness direction of the roof plate 1; the diameter of the first threaded hole 9 is smaller than the diameter of the second through hole 7.

[0048] A hollow channel 17 with both ends open is provided on the extension member 3, and the axis of the hollow channel 17 is parallel to the length direction of the roof ridge body 2.

[0049] In this embodiment, the extension member 3 can be made of C-shaped steel and welded to the bottom of the roof ridge body 2.

[0050] Embodiment 2

[0051] An assembled double-slope steel structure roof, on the basis of Embodiment 1, as Figures 1 to 5 shown, the locking mechanism includes a locking ring 12 fixedly connected to the end of the extension member 3. The locking ring 12 is coaxial with the first through hole 6, and the inner diameter of the locking ring 12 is equal to the outer diameter of the rotating shaft 8; the end of the rotating shaft 8 is detachably connected to the locking ring 12.

[0052] In this embodiment, third threaded holes 13 are also provided at both ends of the rotating shaft 8, and the axes of the third threaded holes 13 are perpendicular to the axis of the rotating shaft 8; a plurality of circumferentially distributed flat portions 14 are provided on the outer wall of the locking ring 12. The flat portions 14 are opposite to each other in the radial direction, and fourth threaded holes 15 matching the third threaded holes 13 are provided on the flat portions 14; between the end of the rotating shaft 8 and the locking ring 12, they are connected by a second bolt 16 passing through the third threaded holes 13 and the fourth threaded holes 15. More preferably, there are at least 12 flat portions 14.

[0053] As Figure 6 and Figure 7 shown, this embodiment also includes a limiting member 18 fixedly connected to the bottom of the extension member 3. The limiting member 18 is located in the inner direction of the installation groove 4, and one side of the limiting member 18 facing the corresponding installation groove 4 is open; it also includes a first baffle 19 slidably fitted in the limiting member 18. One end of the first baffle 19 away from the limiting member 18 is detachably connected with a second baffle 20, and the second baffle 20 extends upward from the top surface of the first baffle 19. Preferably, the second baffle 20 and the first baffle 19 are connected by a third bolt 23.

[0054] A plurality of hooks 21 are provided on the top surface of the top plate 1; it also includes a pull rope 22, one end of the pull rope 22 is fixed to the side wall of the extension member 3 and the other end is connected to the hook 21.

[0055] Preferably, the pull rope can be an elastic rope equipped with a wire winder; a tension sensor can also be provided for the pull rope to monitor the tension of the pull rope in real time. If the tension of the pull rope is abnormal, the staff can be prompted to repair or reinforce the roof structure.

[0056] Embodiment 3

[0057] An installation method for an assembled double-slope steel structure roof, used to install the double-slope steel structure roof as Figures 1 to 7 shown, includes the following steps:

[0058] S1. Insert each mounting part 5 at the edge of the top plate 1 into the corresponding mounting groove 4, align each second through hole 7 with the first through hole 6, and insert the rotating shaft 8.

[0059] S2. Adjust the angle of the rotating shaft 8 so that the second threaded holes 10 on the rotating shaft 8 are respectively aligned with the first threaded holes 9 on each mounting part 5, and screw in and tighten the first bolts 11 from each mounting groove 4.

[0060] S3. Adjust the top plate 1 to the required angle, and fix the top plate 1 and the extension part 3 through the locking mechanism.

[0061] In a more preferred embodiment, step S3 specifically includes:

[0062] S301. Rotate the top plate 1 to the required position, so that the third threaded holes 13 at both ends of the rotating shaft 8 are respectively aligned with a set of fourth threaded holes 15 on the locking rings 12 at both ends of the extension part 3.

[0063] S302. Screw in and tighten the second bolts 16 from the outside of the locking ring 12.

[0064] In a more preferred embodiment, after step S3, it further includes:

[0065] S4. Pull out the first baffle 19 outward.

[0066] S5. Select a second baffle 20 with a suitable height according to the distance between the outer end of the first baffle 19 and the bottom surface of the top plate 1, and connect it to the first baffle 19 so that there is a gap between the top end of the second baffle 20 and the bottom surface of the top plate 1.

[0067] S6. Stuff a sealing material 24 into the gap. The sealing material 24 in this embodiment is made of a flexible and deformable material, such as plasticine, rubber block or rubber sleeve filled with flexible material, etc.

[0068] The above specific embodiments further elaborate on the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above is only the specific embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0069] Note that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. In addition, the term "connected" as used in this document, unless otherwise specified, may be directly connected or indirectly connected via other components.

Claims

1. An assembled double-slope steel structure roof, comprising a ridge part and roof plates (1) connected to both sides of the ridge part, characterized in that, The ridge part includes a ridge body (2) and an extension piece (3) fixedly connected to the bottom of the ridge body (2). A plurality of installation grooves (4) are formed on both sides of the extension piece (3). A plurality of installation parts (5) for inserting into the installation grooves (4) are arranged at one end of the top plate (1) facing the ridge part. The installation parts (5) correspond to the installation grooves (4) one by one, and the installation parts (5) are rotatably connected in the installation grooves (4); A locking mechanism for fixing the top plate (1) and the extension piece (3) is also included; A first through hole (6) penetrating all the installation grooves (4) on the same side is formed on the extension piece (3), and a second through hole (7) matching the first through hole (6) is formed on the installation part (5); A rotating shaft (8) passing through all the first through holes (6) and second through holes (7) on the same side is also included; The rotating shaft (8) is fixedly connected to the installation part (5), and the locking mechanism is used to fix the angle of the rotating shaft (8); A first threaded hole (9) penetrating the second through hole (7) is formed on the installation part (5), and a plurality of second threaded holes (10) matching the first threaded hole (9) are formed on the rotating shaft (8); Between the rotating shaft (8) and the installation part (5), they are fixedly connected by a first bolt (11) passing through the first threaded hole (9) and the second threaded hole (10); The installation part (5) is square. The axis of the first threaded hole (9) is perpendicular to the axis of the second through hole (7), and the axis of the first threaded hole (9) is parallel to the thickness direction of the top plate (1); The aperture of the first threaded hole (9) is smaller than the aperture of the second through hole (7); A limiting piece (18) fixedly connected to the bottom of the extension piece (3) is also included. The limiting piece (18) is located in the inner direction of the installation groove (4), and one side of the limiting piece (18) facing the corresponding installation groove (4) is open; A first baffle (19) slidably fitted in the limiting piece (18) is also included. One end of the first baffle (19) away from the limiting piece (18) is detachably connected with a second baffle (20), and the second baffle (20) extends upward from the top surface of the first baffle (19); The second baffle (20) and the first baffle (19) are connected by a third bolt (23); A plurality of hooks (21) are arranged on the top surface of the top plate (1); A pull rope (22) is also included. One end of the pull rope (22) is fixed to the side wall of the extension piece (3), and the other end is connected to the hook (21); The pull rope (22) is an elastic rope equipped with a winder; The pull rope (22) is equipped with a tension sensor for real-time monitoring of the pull rope tension; If the pull rope tension is abnormal, prompt the staff to repair or reinforce the roof structure; The locking mechanism includes a locking ring (12) fixedly connected to the end of the extension piece (3). The locking ring (12) is coaxial with the first through hole (6), and the inner diameter of the locking ring (12) is equal to the outer diameter of the rotating shaft (8); The end of the rotating shaft (8) is detachably connected to the locking ring (12); Both ends of the rotating shaft (8) are provided with third threaded holes (13), and the axis of the third threaded hole (13) is perpendicular to the axis of the rotating shaft (8); a plurality of circumferentially distributed flat portions (14) are provided on the outer wall of the locking ring (12), the flat portions (14) are opposite to each other in pairs along the radial direction, and fourth threaded holes (15) matching the third threaded holes (13) are provided on the flat portions (14); between the end of the rotating shaft (8) and the locking ring (12), they are connected by a second bolt (16) passing through the third threaded hole (13) and the fourth threaded hole (15); there are at least 12 flat portions (14); A hollow channel (17) with both ends open is provided on the extension member (3), and the axis of the hollow channel (17) is parallel to the length direction of the roof body (2); the extension member (3) is made of C-shaped steel and welded to the bottom of the roof body (2); The bottom end of the installation groove (4) is open; a plurality of installation grooves (4) on the same side of the extension member (3) are equidistantly distributed.

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