Roof structure

Abstract

The utility model discloses a roof structure which comprises a purline, a roof panel, a daylighting band and a support, the roof panel, the daylighting band and the support are all arranged on the purline, the daylighting band comprises a daylighting panel and an edge locking piece connected with the daylighting panel, one end of the edge locking piece is fixedly connected with the daylighting panel, and the other end of the edge locking piece is fixed with one end of the roof panel and one end of the support in an engaged mode. And the other end of the support is fixedly connected with the purline. According to the roof structure provided by the utility model, the lockrand part and the roof panel form a lockrand structure, so that the lap joint of the lockrand part and the roof panel is not easy to break.

Description

Technical Field

[0001] The utility model relates to a roof structure and belongs to the technical field of building roof structures. Background Art

[0002] With the continuous improvement of building design and installation technology, skylights are being adopted by more and more buildings and appearing more and more in people's sight. Their unique light transmittance and sun shading properties have been favored by more and more people.

[0003] At present, steel structure buildings are widely used in various types of buildings such as civil buildings, industrial plants, warehouses, etc. The roof of a steel structure building is usually constructed by laying roof color plates on the purlins. When there is a requirement for lighting, a few roof color plates can be removed from the roof as light openings as needed, and then the light panels can be installed at the light openings.

[0004] In the related art, both the skylight and the roof panel are provided with curled lock edges, and the skylight and the roof panel are connected by riveting bolts after their respective curled lock edges are engaged, or the skylight adopts a flat structure and is directly riveted or glued to the roof panel. Since the skylight is made of glass fiber, it has large deformation due to cold and hot conditions, which makes it easy for the skylight board and the roof color panel to tear or debond at the overlap, posing a risk of water leakage. Utility Model Content

[0005] The utility model aims to provide a roof structure, which forms a locking structure through locking pieces and roof panels, and the overlapping parts of the locking pieces and the roof panels are firmly connected and not easy to break, so as to avoid water leakage.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A roof structure comprises a purlin, a roof panel, a light strip and a support, wherein the roof panel, the light strip and the support are all arranged on the purlin.

[0008] The lighting belt includes a lighting board and a locking piece connected to the lighting board, one end of the locking piece is fixedly connected to the lighting board, and the other end is engaged and fixed with the roof panel and one end of the support, and the other end of the support is fixedly connected to the purlin.

[0009] As a further improved technical solution of the utility model, the edge locking member includes a first curling portion, the first curling portion is located on a side of the edge locking member away from the skylight board, and the roof panel includes a second curling portion.

[0010] The support includes a support body, a support portion and a third curling portion, the support body is connected to the purlin, the support portion and the third curling portion are both connected to one end of the support body away from the purlin, the support portion is used to support the roof panel or the locking edge part, the first curling portion, the second curling portion and the third curling portion are interlocked and connected, the third curling portion is located between the first curling portion and the second curling portion, the skylight is a light-transmitting panel, and the locking edge part is a metal part.

[0011] As a further improved technical solution of the utility model, the locking member includes a base and a first inclined portion, the base connects the first curling portion and the first inclined portion, the first inclined portion is bent and extends obliquely from the base in a direction away from the first curling portion, the lighting plate includes a second inclined portion, the first inclined portion and the second inclined portion are fixedly connected by rivets,

[0012] A sealant is provided between the first inclined portion and the second inclined portion; or the first inclined portion and the second inclined portion are directly connected by the sealant.

[0013] As a further improved technical solution of the utility model, the first curling portion curls and extends from the base in a direction away from the first inclined portion, the roof panel includes a roof panel body and an abutting portion connected to the roof panel body, the second curling portion curls and extends from the abutting portion in a direction away from the roof panel body, and the supporting portion of the support is used to support the abutting portion or the base.

[0014] The locking edge pieces are connected to both sides of the lighting strip, and the second curling portions are connected to both sides of the roof panel body.

[0015] As a further improved technical solution of the utility model, the two first curling portions are respectively a first side curling portion and a second side curling portion, the first side curling portion is abutted against the inner side of one of the second curling portions, and the other second curling portion is abutted against the inner side of the second side curling portion, or;

[0016] Each of the first curling portions is correspondingly held against an inner side of the second curling portion, or;

[0017] Each of the second curling portions is correspondingly pressed against the inner side of the first curling portion.

[0018] As a further improved technical solution of the utility model, the first side curling portion includes a first curling portion, a second curling portion connected to the first curling portion, and a first vertical portion, the first vertical portion is connected to the base, at least one of the first curling portion and the second curling portion is abutted against the inner side of the second curling portion, the second side curling portion includes a second vertical portion, a third curling portion and a guide portion connected in sequence, the second vertical portion is connected to the base, and the guide portion is folded outward and extends from the third curling portion.

[0019] As a further improved technical solution of the utility model, the supports are provided between the first side curling portion and the second curling portion and between the second side curling portion and the second curling portion, wherein the supporting portion of one of the supports abuts against the base connected to the first side curling portion, and the supporting portion of the other support abuts against the abutting portion of the roof panel.

[0020] As a further improved technical solution of the utility model, the support body includes a base plate and a vertical plate vertically connected to the base plate, the support portion is vertically bent from the vertical plate to the side facing away from the base plate, the third curled edge portion is curled from the vertical plate to the side facing away from the base plate, and the base plate is detachably connected to the purlin.

[0021] As a further improved technical solution of the utility model, the roof panel body includes a third inclined portion, the abutting portion is connected to the third inclined portion, the third inclined portion is parallel to the guide portion, and the second inclined portion of the lighting panel is opposite to the third inclined portion.

[0022] As a further improved technical solution of the utility model, the lighting plate includes a raised portion and a first flat plate connected to both sides of the raised portion, the second inclined portion is connected to the first flat plate, and the raised portion protrudes outward relative to the first flat plate.

[0023] The roof panel body includes a water guide portion and second flat plates connected to both sides of the water guide portion, the inclined portion is connected to the second flat plate, and the water guide portion protrudes outward relative to the second flat plate.

[0024] The first flat plate and the second flat plate are both in contact with the purlin.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] A support is provided between the light strip and the roof panel, the third curling portion of the support is engaged with the first curling portion and the second curling portion, the supporting portion of the support supports the roof panel or the light strip, and the support body is connected to the purlin, thereby achieving a firm connection between the light strip and the roof panel;

[0027] There is no need to use bolts to connect the skylight strip to the roof panel, nor to connect the skylight strip, roof panel and purlins, eliminating the need for drilling and avoiding the risk of water leakage.

[0028] The light strip includes a light board and a locking edge piece, which are separately arranged so that the light board and the locking edge piece can be made of different materials according to functional requirements. One end of the locking edge piece is connected to the light board, and the other end of the locking edge piece is a first rolled edge portion, which is engaged and connected with the second rolled edge portion of the roof panel, thereby achieving a firm connection between the light strip and the roof panel, and the overlapping portion between the locking edge piece and the roof panel is not easy to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the roof structure of the utility model;

[0030] Figure 2 yes Figure 1 Side view of

[0031] Figure 3 yes Figure 2 A magnified schematic diagram of the middle A area;

[0032] Figure 4 yes Figure 2 A magnified schematic diagram of the middle B area;

[0033] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the middle roof panel;

[0034] Figure 6 yes Figure 5 Side view of

[0035] Figure 7 yes Figure 6 Enlarged schematic diagram of the middle C area;

[0036] Figure 8 yes Figure 6 The enlarged schematic diagram of the D area in the middle;

[0037] Fig. 9 yes Figure 1 A three-dimensional schematic diagram of the central lighting belt;

[0038] Fig.10 yes Fig. 9 Side view of

[0039] Fig.11 yes Fig.10 Enlarged schematic diagram of the middle E area;

[0040] Fig.12 yes Fig.10 Enlarged schematic diagram of the middle F area;

[0041] Fig.13 yes Figure 1 A three-dimensional schematic diagram of the middle support;

[0042] Fig.14 yes Figure 1 Side view of. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present invention; on the contrary, they are merely examples of devices, products and / or methods that are consistent with some aspects of the present invention and are recorded in the claims of the present invention.

[0044] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the scope of protection of the present invention. The singular forms "a", "said" or "the" used in the specification and claims of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0045] It should be understood that the words used in the specification and claims of the present invention, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, words such as "one" or "an" do not indicate a quantitative limitation, but indicate the existence of at least one. Unless otherwise specified, words such as "front", "rear", "upper", "lower" and similar words appearing in the present invention are only for the convenience of description and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprise" are an open-ended expression, meaning that the elements appearing before "include" or "comprise" include the elements appearing after "include" or "comprise" and their equivalents, which does not exclude that the elements appearing before "include" or "comprise" may also include other elements. If "several" appears in the present invention, it means two or more.

[0046] Please refer to Figures 1 to 14 As shown, the utility model discloses a roof structure, including a purlin 1, a roof panel 2, a light strip 3 and a support 4, wherein the roof panel 2, the light strip 3 and the support 4 are all arranged on the purlin 1, and the roof panel 2, the light strip 3 and the support 4 are supported by the purlin 1.

[0047] See also Figure 2 and Figure 4The roof panel 2 includes a roof panel body 21, an abutting portion 22 connected to the roof panel body 21, and a second curling portion 23 connected to the abutting portion 22. Figure 6 The roof panel body 21 includes a third inclined portion 211, a water guide portion 212, and a second flat plate 213 connected to both sides of the water guide portion 212. One side of the third inclined portion 211 is connected to the second flat plate 213, and the abutting portion 22 is connected to the other side of the third inclined portion 211. The second flat plate 213 abuts against the purlin 1, and the water guide portion 212 protrudes outward relative to the second flat plate 213, so that the water guide portion 212 is away from the purlin 1, and the water guide portion 212 has a water guide groove 2120, which is used to guide water out.

[0048] See also Figure 2 and Figure 4 The lighting strip 3 includes a lighting board 31 and a locking piece 32 connected to the lighting board 31. The lighting board 31 is a light-transmitting board, such as a light-transmitting plastic board; the locking piece 32 is a metal piece, which is convenient for locking and connecting with the roof panel 2. The lighting board 31 and the locking piece 32 are separately arranged, so that the lighting board 31 and the locking piece 32 can be made of different materials according to functional requirements. Specifically, the locking piece 32 is made of aluminum alloy. One end of the locking piece 32 is fixedly connected to the lighting board 31, and the other end is fixedly engaged with the roof panel 2 and one end of the support 4, and the other end of the support 4 is fixedly connected to the purlin 1.

[0049] In some embodiments, see Figure 2 and Figure 4 The lighting board 31 includes a second inclined portion 311, a raised portion 312, and a first flat plate 313 connected to both sides of the raised portion 312. The second inclined portion 311 is connected to the first flat plate 313. The first flat plate 313 abuts against the purlin 1. The raised portion 312 protrudes outward relative to the first flat plate 313, so that the raised portion 312 is away from the purlin 1. The raised portion 312 is provided to keep consistent with the shape of the roof panel 2 to ensure the consistency of the roof appearance. Of course, in other embodiments, the lighting board 31 may also only include the second inclined portion 311 and the first flat plate 313, and the second inclined portion 311 is connected to the first flat plate 313.

[0050] See also Figure 3 and Figure 4The locking member 32 includes a base 321, a first inclined portion 322 and a first curling portion 323. The base 321 connects the first curling portion 323 and the first inclined portion 322. The first curling portion 323 is located on the side of the locking member 32 away from the lighting board 31. Specifically, the first inclined portion 322 is bent and extended obliquely from the base 321 in a direction away from the first curling portion 323. The first inclined portion 322 is fixedly connected to the second inclined portion 311 of the lighting board 31 by the rivet 5, that is, the surfaces of the locking member 32 and the lighting board 31 that cooperate with each other are both inclined surfaces to avoid water accumulation and leakage. Sealant is applied at the connection between the rivet 5 and the first inclined portion 322 and the second inclined portion 311 to prevent water leakage on the roof. Sealant is provided between the first inclined portion 322 and the second inclined portion 311; or, the first inclined portion 322 and the second inclined portion 311 are directly connected by sealant. That is, there are two ways to connect the first inclined portion 322 and the second inclined portion 311. The first way is to use a combination of rivets and sealant, first apply sealant on the first inclined portion 322 and / or the second inclined portion 311, and then fix the first inclined portion 322 and the second inclined portion 311 together by rivets; the second way is to directly apply sealant on the first inclined portion 322 and / or the second inclined portion 311, and then tightly bond the two together. Furthermore, in the above two ways of connection, in order to improve the sealing effect, sealant can be applied on the entire contact surface between the first inclined portion 322 and the second inclined portion 311.

[0051] The first curling portion 323 is engaged with the second curling portion 23 to realize the locking connection between the roof panel 2 and the lighting strip 3. In this embodiment, the first curling portion 323 of the locking member 32 is engaged with the second curling portion 23 of the roof panel 2, thereby solving the problem that the overlapping portion between the lighting panel 31 and the roof panel 2 is easily torn. Specifically, the first curling portion 323 curls and extends from the base portion 321 in a direction away from the first inclined portion 322, and the second curling portion 23 curls and extends from the abutting portion 22 in a direction away from the roof panel body 21, that is, when the first curling portion 323 wraps the second curling portion 23, the free end of the second curling portion 23 extends toward the inner end of the first curling portion 323, away from the free end of the first curling portion 323; when the second curling portion 23 wraps the first curling portion 323, the free end of the first curling portion 323 extends toward the inner end of the second curling portion 23, away from the free end of the second curling portion 23, which is beneficial to improving the bite firmness of the first curling portion 323 and the second curling portion 23.

[0052] Both sides of the lighting strip 3 are connected to the edge locking pieces 32, and both sides of the roof panel body 21 are connected to the second curling parts 23. In some embodiments, see Figures 9 to 12, the two first curling portions 323 have different structures, and the two first curling portions 323 are respectively a first side curling portion 323a and a second side curling portion 323b, the first side curling portion 323a abuts against the inner side of one of the second curling portions 23, and the other second curling portion 23 abuts against the inner side of the second side curling portion 323b. In another embodiment, the two first curling portions 323 have the same structure, and each first curling portion 323 abuts against the inner side of the second curling portion 23. In yet another embodiment, the two second curling portions 23 have the same structure, and each second curling portion 23 abuts against the inner side of the first curling portion 323.

[0053] For details, see Fig.11 The first side curling portion 323a includes a first curling portion 3231, a second curling portion 3232 connected to the first curling portion 3231, and a first vertical portion 3230. At least one of the first curling portion 3231 and the second curling portion 3232 is pressed against the inner side of the second curling portion 23, and the first vertical portion 3230 is connected to the base 321. Since the curling degrees of the first curling portion 3231 and the second curling portion 3232 are different, the first side curling portion 323a is easy to deform, which makes it easier for the first side curling portion 323a to be inserted into the second curling portion 23, thereby increasing the firmness of the engagement between the two. Fig.12 The second side curling portion 323b includes a second vertical portion 3233, a third curling portion 3234 and a guide portion 3235 which are connected in sequence. The second vertical portion 3233 is connected to the base 321, and the guide portion 3235 is folded outward and extends from the third curling portion 3234.

[0054] Accordingly, see Figures 6 to 8 The structures of the two second curling portions 23 on both sides of the roof panel body 21 are different. The two second curling portions 23 include a first corresponding curling portion 23a and a second corresponding curling portion 23b. The first side curling portion 323a is abutted against the inner side of the first corresponding curling portion 23a, and the second corresponding curling portion 23b is abutted against the inner side of the second side curling portion 323b.

[0055] See also Figure 7 The first corresponding curling portion 23a includes a third vertical portion 231, a fourth curling portion 232 and a fourth vertical portion 233 connected in sequence, and the third vertical portion 231 is connected to the abutting portion 22. The fourth vertical portion 233 is provided at the free end of the first corresponding curling portion 23a to prevent the first side curling portion 323a from falling out. Figure 8 The second corresponding curling portion 23b includes a fifth vertical portion 234, a fifth curling portion 235 and a sixth curling portion 236 which are connected in sequence. The fifth vertical portion 234 is connected to the abutting portion 22. The curling degrees of the fifth curling portion 235 and the sixth curling portion 236 are different, so that the second corresponding curling portion 23b is easy to deform, making it convenient for the second corresponding curling portion 23b to be stuck in the second side curling portion 323b.

[0056] See also Figure 3 and Figure 4 The support 4 includes a support body 41, a support portion 42 and a third curling portion 43. The support body 41 is connected to the purlin 1. The support portion 42 and the third curling portion 43 are both connected to one end of the support body 41 away from the purlin 1. The support portion 42 is used to abut the roof panel 2 or the locking edge member 32. The first curling portion 323, the second curling portion 23 and the third curling portion 43 are mutually engaged and connected by an automatic locking edge machine. The third curling portion 43 is located between the first curling portion 323 and the second curling portion 23. Specifically, the support portion 42 of the support 4 is used to support the abutting portion 22 or the base 321. In this embodiment, the light strip 3 and the roof panel 2 are connected to the purlin 1 through the support 4. The light strip 3 and the roof panel 2 are not connected by bolts. The light strip 3 and the roof panel 2 are not connected by bolts to the purlin 1, respectively, so that drilling is omitted to avoid the risk of water leakage.

[0057] In this embodiment, a support 4 is provided between the first side curling portion 323a and the second curling portion 23 and between the second side curling portion 323b and the second curling portion 23, wherein the supporting portion 42 of one support 4 abuts against the base 321 connected to the first side curling portion 323a, and the supporting portion 42 of the other support 4 abuts against the abutting portion 22 of the roof panel 2.

[0058] For details, see Fig.13 and Fig.14 The support body 41 includes a bottom plate 411 and a vertical plate 412 vertically connected to the bottom plate 411, the support portion 42 is vertically bent from the vertical plate 412 to the side facing away from the bottom plate 411, the third curling portion 43 is curled from the vertical plate 412 to the side facing away from the bottom plate 411, and the bottom plate 411 is detachably connected to the purlin 1. For example, the bottom plate 411 is detachably connected to the purlin 1 by bolts.

[0059] In this embodiment, the third inclined portion 211 is parallel to the guide portion 3235, and the third inclined portion 211 can guide rainwater to the guide portion 3235, which is conducive to drainage. The second inclined portion 311 of the lighting plate 31 is opposite to the third inclined portion 211, and the inclined setting is conducive to drainage.

[0060] The above implementation modes are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of the present invention should be based on the technical personnel in the relevant technical field. Although the present invention has been described in detail in this specification with reference to the above implementation modes, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present invention, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A roof structure, characterized in that: It comprises a purlin (1), a roof panel (2), a light strip (3) and a support (4), wherein the roof panel (2), the light strip (3) and the support (4) are all arranged on the purlin (1). The skylight strip (3) comprises a skylight board (31) and a locking piece (32) connected to the skylight board (31); one end of the locking piece (32) is fixedly connected to the skylight board (31); the other end is engaged and fixed with the roof panel (2) and one end of the support (4); the other end of the support (4) is fixedly connected to the purlin (1).

2. The roof structure according to claim 1, characterized in that: The locking member (32) comprises a first curling portion (323), wherein the first curling portion (323) is located on a side of the locking member (32) away from the skylight board (31), and the roof panel (2) comprises a second curling portion (23). The support (4) comprises a support body (41), a support portion (42) and a third curling portion (43); the support body (41) is connected to the purlin (1); the support portion (42) and the third curling portion (43) are both connected to one end of the support body (41) away from the purlin (1); the support portion (42) is used to abut against the roof panel (2) or the locking edge member (32); the first curling portion (323), the second curling portion (23) and the third curling portion (43) are mutually engaged and connected; the third curling portion (43) is located between the first curling portion (323) and the second curling portion (23); The lighting board (31) is a light-transmitting board, and the edge-locking piece (32) is a metal piece.

3. The roof structure according to claim 2, characterized in that: The locking member (32) comprises a base (321) and a first inclined portion (322), wherein the base (321) connects the first curling portion (323) and the first inclined portion (322), wherein the first inclined portion (322) is bent and extends obliquely from the base (321) in a direction away from the first curling portion (323), and the lighting plate (31) comprises a second inclined portion (311), wherein the first inclined portion (322) and the second inclined portion (311) are fixedly connected by a rivet (5). A sealant is provided between the first inclined portion (322) and the second inclined portion (311); or the first inclined portion (322) and the second inclined portion (311) are directly connected via the sealant.

4. The roof structure according to claim 3, characterized in that: The first curling portion (323) curls and extends from the base (321) in a direction away from the first inclined portion (322); the roof panel (2) comprises a roof panel body (21) and an abutting portion (22) connected to the roof panel body (21); the second curling portion (23) curls and extends from the abutting portion (22) in a direction away from the roof panel body (21); the supporting portion (42) of the support (4) is used to support the abutting portion (22) or the base (321); The locking edge pieces (32) are connected to both sides of the lighting strip (3), and the second curling edge parts (23) are connected to both sides of the roof panel body (21).

5. The roof structure according to claim 4, characterized in that: The two first curling portions (323) are respectively a first side curling portion (323a) and a second side curling portion (323b), the first side curling portion (323a) is pressed against the inner side of one of the second curling portions (23), and the other second curling portion (23) is pressed against the inner side of the second side curling portion (323b), or; Each of the first curling portions (323) is correspondingly pressed against the inner side of the second curling portion (23), or; Each of the second curling portions (23) is correspondingly pressed against the inner side of the first curling portion (323).

6. The roof structure according to claim 5, characterized in that: The first side curling portion (323a) includes a first curling portion (3231), a second curling portion (3232) connected to the first curling portion (3231), and a first vertical portion (3230), wherein the first vertical portion (3230) is connected to the base (321), and at least one of the first curling portion (3231) and the second curling portion (3232) is abutted against the inner side of the second curling portion (23), and the second side curling portion (323b) includes a second vertical portion (3233), a third curling portion (3234) and a guide portion (3235) connected in sequence, wherein the second vertical portion (3233) is connected to the base (321), and the guide portion (3235) is folded outward and extends from the third curling portion (3234).

7. The roof structure according to claim 5, characterized in that: The support (4) is provided between the first side curling portion (323a) and the second curling portion (23), and between the second side curling portion (323b) and the second curling portion (23), wherein the supporting portion (42) of one of the supports (4) abuts against the base (321) connected to the first side curling portion (323a), and the supporting portion (42) of the other support (4) abuts against the abutting portion (22) of the roof panel (2).

8. The roof structure according to claim 2, characterized in that: The support body (41) comprises a bottom plate (411) and a vertical plate (412) vertically connected to the bottom plate (411); the support portion (42) is vertically bent from the vertical plate (412) to a side facing away from the bottom plate (411); the third curling portion (43) is curled from the vertical plate (412) to a side facing away from the bottom plate (411); and the bottom plate (411) is detachably connected to the purlin (1).

9. The roof structure according to claim 6, characterized in that: The roof panel body (21) includes a third inclined portion (211), the abutting portion (22) is connected to the third inclined portion (211), the third inclined portion (211) is parallel to the guiding portion (3235), and the second inclined portion (311) of the lighting panel (31) is opposite to the third inclined portion (211).

10. The roof structure according to claim 9, characterized in that: The lighting plate (31) comprises a protruding portion (312) and a first flat plate (313) connected to both sides of the protruding portion (312); the second inclined portion (311) is connected to the first flat plate (313); the protruding portion (312) protrudes outward relative to the first flat plate (313); The roof panel body (21) comprises a water guide portion (212) and second flat plates (213) connected to both sides of the water guide portion (212); the third inclined portion (211) is connected to the second flat plate (213); the water guide portion (212) protrudes outward relative to the second flat plate (213); The first flat plate (313) and the second flat plate (213) are both in contact with the purlin (1).

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